|| List of recent Motor Control-related patents
|Apparatus and method to improve toddler's steps and mobility|
An apparatus which can be operated in one of two modes. The apparatus has a plurality of legs, a processor, at least one electronic motor controlled by the processor, a plurality of mechanical gears coupled to the at least one electronic motor, the plurality of mechanical gears are configured to adjust a length of the at least one leg wherein a point on a surface of the apparatus can be adjusted in height.
|Wireless motor control system|
A wireless motor control system includes a connection device and a remote control device. The connection device has a pair of motor connection terminals and a pair of power connection terminals for connecting a motor and an electric power source.
|Variable speed fan motor|
A variable speed fan motor, including: a variable speed motor and a motor controller. The motor controller includes a microprocessor, an inverter circuit, a gear detection circuit, and a power supply unit.
|Electric motor braking using thermoelectric cooling|
An electric motor controller includes controller electronics configured to control an electric motor. The electric motor controller also includes a thermoelectric cooler in thermal communication with the controller electronics.
|Medical drive device|
An object is to detect the pressing force of a tip driven unit. In the controller 22, a motor control circuit 85, a load change detection unit 86, a moving speed calculation unit 87 that calculates the moving speed of a rotating body 41, a pressing force detection unit 88 that obtains the pressing force of the rotating body 41 based on the moving speed which is calculated, a cpu 89, and an alarm 91 are disposed.
|Motor controller with reverse-bias preventing mechanism|
A motor controller with a reverse-bias preventing mechanism includes a pre-charging unit, a protection unit, a conversion unit and a control unit. The pre-charging unit receives a power signal through a first electric-conduction path, and converts the power signal into a pre-charging signal according to a control signal.
|Image reading apparatus|
An image reading apparatus includes a reading unit, a feeding unit, a carriage holding the reading unit, a motor, a motor-side transmission gear, a feeding unit-side transmission gear, a carriage-side transmission gear, a switching gear which switches between a meshing state of meshing with the feeding unit-side transmission gear at a feeding unit-side position and a meshing state of meshing with the carriage-side transmission gear at a carriage-side position, a restraint member which applies a restraint force for restraining the switching of the switching gear, and a motor control unit which when switching the switching gear between the carriage-side position and the feeding unit-side position, executes a large torque control of controlling the motor to generate a switching torque which is larger than a moving reading torque to be generated by the motor at a time of document reading when executing a moving reading.. .
|Motor control system and method for a laser scanning unit of an imaging apparatus|
A scanning system for use in an imaging apparatus includes a mirror assembly having a rotating mirror with a plurality of facets, a motor operatively coupled to the rotating mirror and closed loop control circuitry coupled to the motor. The minor assembly generates a lock signal indicative of whether or not the motor is substantially at a target speed.
|System and method of using high energy battery packs|
Energy storage system having one or more battery packs and a system controller for controlling the battery packs. Each battery pack has rechargeable storage cells and a battery pack controller in communication with the system controller.
|Mail sorting system|
Provided is a mail sorting system including: a detection unit configured to output a detection signal for a length of a mail inserted to a conveyor belt; a crossbelt driving unit configured to control a motor interworking with a crossbelt including a central region and first and second lateral regions adjacent to both sides based on the central region where the mail is moved and arranged from the conveyor belt; and a control unit configured to transmit a motor control signal which controls at least one of an rpm and a rotational speed of the motor so that the mail is arranged on any one of the central region and the first and second lateral regions based on the detection signal, to the crossbelt driving unit, in order to easily discharge the mail from a destination discharge point by disposing the inserted mail at a setting region of the crossbelt.. .
|Motor control apparatus for hybrid vehicles|
An apparatus controls a motor equipped in a hybrid vehicle. In this apparatus, a basic torque command value of the motor is calculated so as to reduce a deviation between a target rotation speed and an actual rotation speed of the motor.
|Motor drive configuration system and method|
A motor drive comprises a power sub-assembly and a control sub-assembly removably secured to the power sub-assembly. The power sub-assembly contains all power electronic circuitry and driver circuitry for the power electronics.
|Robot apparatus, robot control method, program, and recording medium|
A robot apparatus includes a rectangular wave generating portion arranged on the output side of a speed reducer, and configured to generate first output pulse signals upon driving of a joint. A control portion includes calculating portions and a motor control portion.
|Multi-axis motor driving system and multi-axis motor driving apparatus|
The multi-axis motor driving apparatus includes an integrated controller that is configured to discriminate between a drive axis that uses the motor subjected to semi-closed control based on the motor control command and a detection position detected by the encoder and a drive axis that uses the motor subjected to full-closed control based on the motor control command, the detection position detected by encoder and a detection position detected by the linear scale, based on a change amount of the detection position of the encoder or the detection position of the linear scale obtained when the motor subjected to full-closed control is driven.. .
|Modular motor drive configuration system and method|
A motor drive system includes a power sub-assembly that comprises power electronic components and driver circuitry for controlling gate drive signals to the power electronic components. A control sub-assembly is removably mounted to the power sub-assembly and comprises control circuitry for implementing a motor control routine for control of an electric motor.
|Motor control system, motor control device, and brushless motor|
A motor control system includes a host ecu and a motor control device. The host ecu controls a wheel driving unit.
|Motor controlling device and motor controlling method|
There are provided a motor controlling device and a motor controlling method. The motor controlling device includes: an open loop driving unit performing open loop controlling using a pulse width modulation (pwm) signal; a closed loop driving unit performing feedback controlling using a difference between a current speed of a motor and the pwm signal; and a driving controlling unit calculating a duty ratio of the pwm signal and comparing the calculated duty ratio with a preset reference duty to thereby control any one of the open loop driving unit and the closed loop driving unit to operate signal..
The invention relates to a document shredder (1), comprising a cutting unit (4), a motor (3) for driving the cutting unit (4), and a motor control system (2). The document shredder (1) additionally has a path measuring device (13), wherein the motor control system (2), by means of the path measuring device (13), determines the length of the already shredded portion of the document to be shredded, and the motor control system (2) controls the motor (3) in dependence on the measured length of the already shredded portion of the document to be shredded..
|Modular instrumentation system for electric vehicle data acquisition, analysis and display, and component control|
Described is a modular instrumentation system for electric vehicle data acquisition, analysis and display, and component control. The system acquires data from and controls (where applicable) the multitude of devices that reside onboard and offboard of the electrical vehicle.
|Method and system for adjusting rotation speed of an extracorporeal therapeutic device|
An extracorporeal therapeutic device automatically controls a rotation speed of a centrifuge for processing whole blood. Separation of whole blood components is achieved with minimal thermal contribution to blood temperature from the motor control mechanism that rotates the centrifuge and from aerodynamic drag on the rotating centrifuge..
|Base for food mixer|
A base for a food mixer includes a body in which a motor is mounted. The base further includes a control unit having a first touch control panel and a processor.
|Method and apparatus to convert a minimally controlled pulse stream into a proper mechatronic trajectory|
An apparatus or method which accepts a burst of pulses at a frequency which may not be tightly controlled and converts this into a trajectory command that is a suitable motion profile for an incremental motor control application. The output of the invention can be a pulse stream that can be fed to an existing incremental pulse input motor drive or the invention can be embedded into a motor drive where its output is a numerical sequence that defines a physically realizable trajectory to be fed to the control circuits and software within the motor drive..
|Motor control device|
A motor control device includes an operation determination unit that determines whether a motor is in an operating state or in a stopped state based on an operation command signal or an operation signal and an amplitude estimation unit that, based on a determination result of the operation determination unit, sequentially estimates a vibration amplitude value from a control state quantity of a feedback control unit or a current control unit separately for a case where the motor is operated and a case where the motor is stopped and outputs the vibration amplitude value. A function of outputting an amplitude of a high-frequency vibration that occurs in a mechanical device including a control system as information useful for estimating an occurrence factor of the vibration is provided..
|Control system for brushless motor|
A motor controller is configured to perform positioning of a rotor of a brushless motor immediately when power supply is turned on, and not after actually receiving a target value related to control for the brushless motor from a main ecu, which determines the target value. The motor controller finishes or is performing the rotor positioning, when the target value is received from the main ecu.
|Motor control system and method for agricultural spreader|
An agricultural spreader system includes a first motor, a second motor, and a valve system coupled to the first motor and to the second motor. The first motor is configured to be driven by a working fluid and to drive a first spreader disc in rotation.
|Drapery tube incorporating batteries within the drapery tube, with a stop for facilitating the loading and unloading of the batteries|
Embodiments of the invention relates to a motorized system for moving vertical blinds, curtains, draperies, or other window coverings. Specific embodiments can, optionally, also be manually operated.
|Computer numerical controlled machine tool control system|
Systems and methods for interfacing a portable control system (pcs) with a machine tool are provided. In some aspects, a computer numerical controlled (cnc) machine tool includes a machine tool having a motor, a machine control system (mcs), and a motor controller.
|Stepping motor control circuit, movement, and analog electronic timepiece|
A rotation detection circuit detects an induced current flowing through a drive coil of a stepping motor in a detection section divided into a plurality of sections, and detects a rotation state of the stepping motor on the basis of a pattern indicating whether or not the induced current exceeds a predetermined reference value in each of the sections. A control unit selects a drive pulse corresponding to the rotation state detected by the rotation detection unit, and supplies a drive current to a drive coil to rotatably drive the stepping motor.
|Stepping motor control circuit, movement and analog electronic timepiece|
A stepping motor control circuit includes: a rotation detection unit that detects a induced signal exceeding a predetermined reference threshold voltage which is generated by a stepping motor in a detection section divided into at least three sections, and detects a rotation state on the basis of a pattern indicating whether the induced signal exceeding a reference threshold voltage is detected in each of the sections; and a control unit that selects a main drive pulse depending on the rotation state detected by the rotation detection unit from a plurality of main drive pulses which are different from each other in energy, and drives the stepping motor. When the induced signal exceeding a reference threshold voltage is not detected in an initial section, the rotation detection unit detects the induced signal by shifting an end position of at least one section other than the initial section to a rear side by a predetermined amount..
|Brushless motor control apparatus and brushless motor control method|
A brushless motor control apparatus (10) of the present invention calculates the number of rotations of an engine based on a cycle of zero-cross points of the phase voltage vsu induced to a sub-coil su of a three-phase brushless motor (1). Then, when the number of rotation of the engine is smaller than the first number of rotations n1, before it becomes impossible to detect the zero-cross points, the control state of the three-phase brushless motor 1 is changed from the state of phase control by a phase control regulator unit (24) with respect to the ac output voltages vu, vv, and vw to the state of interphase short circuit of motor coils by a short regulator unit (25).
A mining vehicle and a method of operating a mining vehicle. The mining vehicle includes a three or more phase electric drive motor.
|Motor control apparatus, motor control method, control system, and position estimation method to be used in control system|
The present invention provides a motor control device capable of operating a robot properly without stopping a motor that operates the robot even when an instantaneous voltage drop occurs. The motor control device 10 that controls the robot operating motor 102 is equipped with the subtraction unit 109 that calculates the position deviation for which the actual rotational position is subtracted from the position command, the position control unit 110 that converts the position deviation to the speed command, the subtraction unit 111 that calculates the speed deviation for which the actual rotational speed measurement is subtracted from the speed command, the speed control unit 112 that converts the speed deviation to a torque command, the limiter 113 that sets the maximum level of the torque command, the driver 114 that drives the motor 102, and the voltage fluctuation detection unit 115 that detects the voltage fluctuation of the power source 103; in the motor control device 101, when an instantaneous voltage drop is detected by the voltage fluctuation detection unit 115, the position command output unit 108 varies the position command so as to reduce the rotational speed of the motor 102, and the position control unit 110 limits the speed command to be output..
|Motor control apparatus including at least two resistance discharge units|
A motor control apparatus includes a rectifier for rectifying ac power to output dc power; an inverter for performing power interconversion of dc power of a dc link and ac power being driving power or regenerative power of a motor by being connected to the dc link being a dc output side of the rectifier; and at least two resistance discharge units each for performing resistance discharge of dc power of the dc link, the resistance discharge units each being connected to the dc link, in which each resistance discharge unit starts a resistance discharge operation for performing resistance discharge of dc power of the dc link at a dc voltage value in the dc link exceeding a first threshold value and stops the resistance discharge operation at a dc voltage value in the dc link smaller than a second threshold value below the first threshold value.. .
|Applied-voltage electrical angle setting method for synchronous motor, and motor control apparatus|
An applied-voltage electrical angle setting method for a synchronous motor includes detecting applied voltage and current of the synchronous motor m, calculating current peak value ip based on the detected values while calculating present applied voltage phase α, calculating target current phase βtarg based on the current peak value ip followed by calculating target applied voltage phase αtarg corresponding to the target current phase in a target value setting unit 20, and calculating new applied voltage electrical angle instruction value θvtarg, based on change angle Δθv obtained by correcting a difference between the present applied voltage phase α and the target applied voltage phase αtarg by response time constant l/r of the synchronous motor, rotational speed ω calculated based on the applied voltage and the current, and the previous applied voltage electrical angle instruction value θvtarg, in a voltage electrical angle instruction value setting unit 10.. .
|Methods and systems for reducing conducted electromagnetic interference|
A drive circuit is provided for reducing conducted electromagnetic interference provided by a power line to a motor controller. The power line includes a first alternating current (ac) line output and a second ac line output.
|Image forming apparatus, motor control apparatus and motor control method|
An image forming apparatus includes an engine unit to perform an image forming job; an engine control unit to control the operation of the engine unit; a brushless direct current (bldc) motor to drive the engine unit; a sensor unit to sense electric angle information and driving velocity information of the bldc motor; a communication interface to receive a digital control command with respect to the bldc motor from the engine control unit; a driving signal unit to generate a driving signal to control the bldc motor; and a digital control unit to control the operation of the driving signal unit in a digital phase locked loop (pll) manner for feedback controls the bldc motor, based on the received digital control command, the detected electric angle information and the driving velocity information and a digital gain value as a control factor with respect to the bldc motor.. .
|Power generating apparatus of renewable energy type and operation method thereof|
A power generating apparatus of renewable energy type includes a rotating shaft rotated by the renewable energy received via a blade, a hydraulic pump driven by the rotating shaft to generate pressurized oil, hydraulic motors driven by the pressurized oil, and synchronous generators connected to a grid without an intervening frequency-conversion circuit and respectively coupled to the hydraulic motors. The displacements of the hydraulic motors are adjusted independently by a motor control unit.
|Electric lawn tractor power management system and method|
An electric lawn tractor power management system and method including a power management switch having a normal mode setting and a power management mode setting. In response to actuation of the power management switch to the power management mode setting, a blade motor controller commands a blade motor to rotate at a power management speed lower than a normal speed, and a traction drive motor controller commands a traction drive motor to rotate up to a maximum power management speed lower than a normal maximum speed.
|Actuator with diagnostics|
A system incorporating an actuator. The actuator may have a motor unit with motor controller connected to it.
|Safety protection device for a speed changing device of a mixer|
A safety protection device for a speed changing device of a mixer is provided with a control unit on an operating rod assembly, and a tact switch is used in combination with the control unit. When using the operating rod assembly to perform gear shift, the user can feel whether the gear has been shifted to the correct position based on position change of the control unit with respect to the tact switch.
|Motor control system which corrects backlash|
A motor control system (10) which includes a difference calculating part (31) which calculates a difference between a first position detection value of a moving part and a second position detection value of a driven part, a judging part (32) which judges if a moving part has engaged with the driven part when the moving part is made to move from any initial position in a first and second drive directions, a holding part (33) which holds the difference as initial difference linked with the first or second drive direction, when the moving part has engaged with the driven part, and a correction amount calculating part (34) which calculates a backlash correction amount, the correction amount calculating part using the difference based on the current positions of the moving part and the driven part and the initial difference to calculate the backlash correction amount.. .
A fan motor, including: a variable speed motor and a motor controller. The motor controller includes: a microprocessor, an inverter unit, a gear detection unit, and a power supply unit.
|Electronic circuit and method for detecting a zero current in a winding of an electric motor|
A motor control circuit and associated techniques detect a zero crossing of a current in a motor winding by detecting a revers current in a half bridge circuit used to drive the motor winding.. .
|Motor control device and motor control method|
A motor control device includes an energization pattern output portion and an inverter circuit. The energization pattern output portion cyclically outputs a plurality of energization patterns.
|Vehicle including motor control device, and control method for vehicle|
A vehicle, including a motor having a rotor, a resolver that detects a rotation angle of the rotor and a control device, and a control method for the vehicle are provided. The control device executes rectangular-wave control over the motor using the rotation angle of the rotor, detected by the resolver, executes zero learning for learning a deviation between an origin of an actual rotation angle of the rotor and an origin of the detected rotation angle of the rotor, corrects the detected rotation angle of the rotor on the basis of a result of the zero learning, and, when the zero learning has not been completed yet, executes avoidance control for avoiding a rapid variation in output of the motor..
|Electronic circuit and method for automatically adjusting a phase of a drive signal applied to an electric motor in accordance with a zero current detected in a winding of the electric motor|
A motor control circuit and associated techniques can adjust a phase of a motor drive to keep a rotational reference position of an electric motor at the same relative phase as a zero current in a motor winding at different motor speeds and as the motor accelerates and decelerates. In some embodiments, a particular circuit and technique can be used to detect the zero current in the motor winding..
|Rotor position estimating device, electric motor control system and rotor position estimating method|
A rotor position estimating device includes a voltage application unit, a current detecting unit and an estimating unit. The voltage application unit is configured to apply a d-axis voltage to an electric motor including a salient-pole rotor during a stop of the electric motor.
|Motor control system and control system for electric motor-driven vehicle|
A motor control system includes a drive motor and a deck motor that are connected to a battery, an ecu, and a key switch. The key switch acquires that an operation unit has been turned on, and transmits a restart permission signal to the ecu.
An actuating apparatus includes a first pulley to which a rotational power of a motor is transmitted, a second pulley to which a rotational power of the first pulley is transmitted through a wire, displacement encoders for detecting respective rotational angles of the first pulley and the second pulley, a slip amount calculator for calculating a slip amount of the second pulley with respect to the wire, and a motor controller for controlling a torque output from the motor based on the slip amount. The slip amount calculator calculates the slip amount based on a change in a rotational angular velocity of the first pulley, a difference between the rotational angles of the first pulley and the second pulley, and the torque output from the motor..
|Utility vehicle two speed drive motor control|
Disclosed are power machines, and drive systems for use thereon, as well as methods of controlling the displacement of a hydraulic drive motor. The drive system includes a drive pump capable of providing a hydraulic power output and a drive motor operably coupled to the drive pump that receives the hydraulic power output from the drive pump.
|Motor control device and vehicle brake hydraulic pressure control apparatus|
A motor control device (a motor driver) for controlling, by a duty control, a current supplied to a motor includes a driving controller, an off controller, and a voltage acquiring section (an a/d conversion processor, a sampling section). The driving controller performs on/off control of the current supplied to the motor with a first period.
|Electric power steering system|
An electric power steering system includes a motor control device that controls, based on an assist command value, driving of a motor that gives an assist torque to a steering mechanism. The motor control device computes a first assist component based on a steering torque and a vehicle speed.
|Electric power steering system|
An electric power steering system includes a motor control device that controls driving of a motor based on an assist command value, the motor applying assist torque to a steering mechanism. The motor control device computes a first assist component based on steering torque and a vehicle speed.
|Electric motor and motor controller|
An electric motor controller having a front face and a rear face, the front face carrying a plurality of ac output couplings and the controller carrying a converter configured to convert a received dc supply into an output ac supply for controlling an electric motor, the ac output couplings being disposed symmetrically about an axis of symmetry of the controller on the front face of the controller. Also described is an apparatus comprising: a dc series motor; and a first current supply configured to supply a first current to an armature of the dc series motor; a second current supply configured to supply a second current to a field winding of the dc series motor; and a controller configured to control the first current supply to supply the first current based on a required torque output for the motor, and to control the second current supply to supply the second current based on the first current..
|Occlusion detection using pulse-width modulation and medical device incorporating same|
Apparatus are provided for motor control systems and related medical devices. In one embodiment, a control system includes a motor having a rotor, a modulation module coupled to the motor, and a control module coupled to the modulation module.
|Motor control device|
A motor control device according to an embodiment includes a first subtractor, a speed controller, and a phase compensating speed observer. The first subtractor subtracts a speed reference from a speed feedback signal to obtain a speed deviation.
|Dynamic pulse-width modulation motor control and medical device incorporating same|
Apparatus are provided for motor control systems and related medical devices. In one embodiment, a control system includes a motor having a rotor, a sensor to obtain a measured displacement that is influenced by rotation of the rotor, and a control module coupled to the sensor.
|Motor control device|
A motor control device includes an h-bridge circuit for controlling on/off of a current fed to a motor, a drive circuit for driving the h-bridge circuit, a drive command signal generator for generating a drive command signal including a pulse signal having a predetermined drive frequency for sending a command to drive the motor, a current detection circuit that includes a current detection resistor and a comparator connected in series with the motor and outputs a comparison output signal based on comparison between a current detection signal of a motor current and a target value signal, a latch circuit for holding a current detection result based on an on signal of the drive command signal and the comparison output signal, and a gate circuit for driving the drive circuit based on the on signal of the drive command signal and a latch output signal from the latch circuit.. .
|Motor driving device, and motor control method|
There is provided a motor driving device including: a speed detection unit detecting a speed of a motor; a comparison unit comparing the speed of the motor detected by the speed detection unit with an external input speed; and a speed control unit outputting the reference speed as a control signal when the speed of the motor is equal to a reference speed or less and outputting a motor control signal generated based on a comparative value of the comparison unit when the speed of the motor exceeds the reference speed.. .
|Brushless motor control device and brushless motor control method|
After a rotor of a three-phase brushless motor is previously moved by a simple control method to a predetermined rotary position, a motor is started-up. A brushless motor control device (10) moves a rotor (3) to a predetermined rotary position (stop position) before a three-phase brushless motor (1) is started-up.
|Electric motor and motor control|
Various embodiments of an electric motor and electronic control for an electric motor are disclosed. An exemplary electric motor comprises a single-phase brushless permanent magnet electric motor.
|Integrating a trench-gated thyristor with a trench-gated rectifier|
An integrated trench-mos-controlled-thyristor plus trench gated diode combination, in which the trenches are preferably formed at the same time. A backside polarity reversal process permits a backside p+ region in the thyristor areas, and only a backside n+ region in the diode areas (for an n-type device).
|Motor control device and electric power steering device using same|
Provided are a motor control device (1) for controlling a motor (2) having a plurality of phases, for quickly and accurately detecting a phase in which an open-state fault has occurred when the open-state fault occurs in a target phase. When a power-supply voltage (vb) is equal to or higher than a predetermined voltage (vthr), a motor rotation speed (ω) is equal to or lower than a predetermined speed (ωthr), a target x-phase voltage command (vx*) is not in the vicinity of zero, a current (ix) of the target x-phase is equal to or lower than a predetermined current (iu_thr), and a state in which a control error is equal to or larger than a predetermined error is detected over a predetermined time period or longer, occurrence of an open-state fault in the target phase is determined..
|Motor control device|
A motor control device includes a drive circuit to drive an h-bridge circuit to control a current fed to a motor, a drive command signal generator to generate a drive command signal including a pulse signal having predetermined drive frequency and duty for sending a command to drive the motor, a current detection circuit operable to output a comparison output signal based on comparison between a current detection signal of a motor current and a target value signal, a latch circuit to hold a current detection result based on an on signal of the drive command signal and the comparison output signal, a gate circuit to drive the drive circuit based on the on signal of the drive command signal and a latch output signal from the latch circuit, and a control unit that changes the duty of the drive command signal based on the current detection result.. .
|Heating circulating pump|
A heating circulating pump includes a pump housing (1) containing a pump impeller driven by an electric motor. The stator thereof is arranged in a motor housing (8) connected to the pump housing (1).
|Motor control device|
The present invention relates to a motor control device provided with the function of detecting the rotor position of a synchronous motor in a sensor-less fashion. The motor control device previously stores a current phase β defined by the two parameters that are an induced voltage peak value ep and the subtracted value (θe−θi) obtained by subtracting an induced voltage electrical angle θe from a current electrical angle θi, and based on the actual detected ep, θi, and θe, selects β by referring to the β previously stored, and calculates the rotor position θm by subtracting the selected β from the actual detected θi.
|Motor control apparatus and motor control method|
A motor control apparatus according to the embodiment includes a rotational position estimating unit, a change amount estimating unit, and an inductance estimating unit. The rotational position estimating unit estimates a rotational position of a rotor from a motor parameter including a q-axis inductance of a motor on a basis of an output current to the motor and a voltage reference.
|Motor control device|
Proposed is a motor control device that executes rotational control that follows load fluctuations in a startup mode. The proposed motor control device is provided with: detection means 4 that detects a current peak value ip and a current electrical angle θi based on phase currents iu to iw; detection means 5 that detects an induced voltage peak value ep and an induced voltage electrical angle θe based on phase currents iu to iw and applied voltages vu to vw; rotor position detection means 6 that detects a rotor position θm using θm=θi−β−90° or θm=θe−γ−90°; velocity fluctuation detection means 15 that detects a rotational velocity ω based on this θm; and startup means 10 that outputs a startup voltage instruction value vp and a startup voltage phase instruction value θv, increases the rotational velocity of the synchronous motor m with predetermined acceleration, and makes the rotational velocity ω detected by the velocity fluctuation detection means 15 be reflected in θv..
|Control device and stepping motor control method|
A motor control device includes a drive unit configured to rotate a rotor by supplying a drive signal with periodical changes to a coil; a detection unit configured to output a signal that is changed in association with a rotation of the rotor; and a control unit configured to control the drive signal supplied by the drive unit in accordance with the signal output from the detection unit, wherein the control unit performs a first control and a second control so as to achieve a target rotation velocity of the rotor, and wherein the first control is a control for controlling the rotation velocity of the rotor by controlling an advance angle of the drive signal with periodical changes and the second control is a control for controlling the rotation velocity of the rotor by controlling a voltage for supplying the drive signal.. .
|Motor control device, motor control method, and image forming apparatus|
A motor control device supplies a drive control signal to a drive circuit that drives a motor at a constant period using a motor drive signal based on the drive control signal, and shuts off the motor drive signal when a count value counted by a counter that reset the count value if a state of the motor changes exceeds a threshold corresponding to a plurality of driving periods of the motor. The motor control device includes: a control unit that controls a setting unit to set a rotational direction of the motor to a first rotational direction and a second rotational direction reverse to the first rotational direction at the constant period alternately, when a drive mode of the motor is a position holding mode to drive the motor so as to hold a rotational position of the motor..
|Variable width hospital bed|
A system for changing width of a person support apparatus is disclosed. A person support apparatus comprises at least one deck extension which is configured to be retracted or extended by at least one motor controlled by a bed controller.