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| Number | Title | Issue Date |
| 7889978 | Motor controller and electric power steering system An angle computing section determines an angle of a rotor, and an angular velocity computing section determines angular velocity of the rotor. A command current computing section determines, from a steering torque and vehicle velocity, command currents and taken alo... | 02/15/2011 |
| 7813626 | Motor controller and electric power steering apparatus A microcomputer (an electric current command value calculating section) carries out field weakening control in which a d-axis electric current command value Id* is set to a negative value in correspondence with rotation angular velocity ω of a motor. The microcompu... | 10/12/2010 |
| 7443132 | Motor control device and method A motor control device for controlling rotation of a motor by controlling a driving voltage applied to the motor is provided. The device includes a driving voltage control unit configured to control the driving voltage, and a detecting unit configured to detect rota... | 10/28/2008 |
| 7372226 | Method for switching off a power tool In a method for shutting off a drive motor (12) of a power tool that drives a tool, the drive motor (12) is shut off as a function of a variable threshold value (E1) if the tool jams. The threshold value (E1) is determined in at l... | 05/13/2008 |
| 7298967 | Electromagnetic sensor direct communication algorithm to a digital microprocessor A method of interfacing an electromagnetic sensor with a controller in a motor control system, the method including: applying an excitation signal to the electromagnetic sensor; receiving a first electromagnetic sensor output signal based on the excitation signal, t... | 11/20/2007 |
| 7265516 | Linear electric motor controller and system for providing linear control The invention relates to a method of, and system for, linear speed control for an electric motor, in which a digital to analog converter means is used for converting an 8-bit digital signal to an analog voltage for setting voltage across a motor, a digital state mac... | 09/04/2007 |
| 7235946 | Actuator current control method The present invention relates to an actuator current control method. The method of the present invention comprising the steps of measuring a feedback current passing through an actuator, determining PWM duty according to an error component between a target current p... | 06/26/2007 |
| 7231266 | Digital control device and program A digital control device for tracking a sine wave according to the present invention has a compensator, a control object and a feedback gain. An input into the compensator is a signal obtained by subtracting a control quantity from a reference value. An input into t... | 06/12/2007 |
| 7215091 | Method for controlling a DC printer motor with a motor driver A method of the invention is for controlling a DC printer motor with a motor driver during a potential stall of the DC printer motor. One step of the method includes detecting the start of the potential stall of the DC printer motor. Another step includes thereafter... | 05/08/2007 |
| 7187142 | Motor drive with velocity noise filter A drive unit for controlling a motor includes a position feedback device and a velocity noise filter. The position feedback device is operable to generate a position signal relating to a position of the motor. The velocity noise filter is coupled to the position fee... | 03/06/2007 |
| 7170249 | Electrical phase compensation in BEMF spindle motor control A method and apparatus for compensating for the asymmetrical phases of a spindle motor in a disc drive are provided. With the apparatus and method, compensation values are learned by sampling speed data during a period of operation of the disc drive where the speed ... | 01/30/2007 |
| 7154241 | Wiper control method and wiper control device There are provided a wiper control method and a wiper control device in which unnecessary wiping operation is not performed. When a fixed amount of water passing through a detection area 4, the water being carried by the wiping operation of a wiper 5 | 12/26/2006 |
| 7109670 | Motor drive with velocity-second compensation An apparatus for use with a signal generator and a motor controller includes a velocity compensator, an adjustor, and a velocity regulator. The signal generator provides a reference velocity signal, and the motor controller receives an output signal and uses the out... | 09/19/2006 |
| 6972534 | Delay compensation for stable current regulation when using variable-delay random PWM switching A control system for an electric machine having a rotor position sensor that generates a rotor position signal, a velocity module that generates an electric angular velocity value based on the rotor position signal, a random pulse width modulation module that genera... | 12/06/2005 |
| 6903530 | Electric motor controller resonance frequency detection apparatus A resonance frequency detector for an electric motor controller in which a resonance frequency can be measured at high speed by a simple calculation and the resonance frequency can be detected by an inexpensive computer is provided. In an electric motor control syst... | 06/07/2005 |
| 6646408 | Method for controlling operating of switched reluctance motor (SRM) A method for controlling driving of a Switched Reluctance Motor (SRM) is capable of operating the SRM normally according to a phase under the normal state in case a noise is inputted to a position sensor in the SRM. In order to achieve the advantage, the ... | 11/11/2003 |
| 6433497 | Drive circuit of a three phase BLDC motor Disclosed is a three phase BLDC motor driving circuit which makes a BEMF voltage generated in a motor lower than a voltage source and makes a difference between the BEMF voltage and the voltage source greater than a saturation voltage of a transistor. An ... | 08/13/2002 |
| 6380702 | Commutator motor control system The invention relates to a control system for a commutator motor which is operated by phase-fired control. Allocation of a first and second control device in a single operating state without transition makes it possible to obtain constant jolting rotation... | 04/30/2002 |
| 6236179 | Constant power speed range extension of surface mounted PM motors A circuit and method for controlling a rotating machine (11) in the constant horsepower range above base speed uses an inverter (15) having SCR's (T1-T6) connected in series with the primary commutation switches (Q1-Q6) to control turn off of the primary ... | 05/22/2001 |
| 6118932 | Method and arrangement for a high voltage single-stage variable speed drive A high voltage, single-stage variable speed motor power supply utilizes direct AC-to-AC converters that do not have any intermediate DC link, along with a multi-level, multi-phase, multi-circuit variable speed motor drive and a motor in which a stator is ... | 09/12/2000 |
| 6107763 | Closed loop and open synchronization of the phase switchings in driving a DC motor The synchronizing circuit of a digital drive system of an electric motor is configured to function in a closed loop or in an open loop mode by adding a minimum number of elements to the normal scheme of a closed loop synchronizing circuit. In practice, by... | 08/22/2000 |
| 6031966 | Motor speed control device The motor speed control device of the present invention is provided with an FG sensor and a waveform shaping circuit for obtaining N pulse signals (Nࣙ1 where N is an integer) in one rotation of a motor so as to control the rotation speed of the motor in... | 02/29/2000 |
| 6031350 | Position control and monitoring circuit and method for an electric motor A position control and monitoring circuitry is provided for an electric motor having a plurality of coils and a movable element. A drive circuit generates a square wave drive signal of variable mark/space ratio to drive the coils to position the movable e... | 02/29/2000 |
| 5859511 | Motor with input-controlled high side driver A circuit for operating a polyphase DC motor, such as the type having a plurality of "Y" connected stator coils, has circuitry for charging the coils at a rate which will reduce EMI and other noise, while maintaining an acceptable charge rate. The gate of... | 01/12/1999 |
| 5854877 | Economical wide range speed control system A speed control system is disclosed wherein a brushless DC motor and a magneto resistive encoder are able to rotate a motor at arbitrarily low speeds. The motor is able to rotate at low speeds by having a filtered signal generated by an encoder applied to... | 12/29/1998 |
| 5796231 | Rotation position detecting device and motor device A rotation position detecting circuit for a sensor-less motor and a motor device include a motor (1) which is rotated and driven by adding a sensor signal having a high frequency to a sine wave drive signal and cosine wave drive signal through adders (5S)... | 08/18/1998 |
| 5780986 | Soft switching, PWM controller and method for reducing torque ripple in multiphase DC motor A PWM controlled multiphase DC motor apparatus has a multiphase DC motor, a current sensor, and a PWM controller. The DC motor has multiple windings which turn on and off during commutation at a commutation frequency. The current sensor is coupled to sens... | 07/14/1998 |
| 5774625 | Arrangement for monitoring the rotational speed of a rotary-anode drive motor of x-ray The invention relates to an X-ray apparatus, comprising a rotary-anode X-ray tube, a device for monitoring the rotational speed of a rotary-anode drive motor of the X-ray tube, a sensor circuit for determining an angle signal which is dependent on the pha... | 06/30/1998 |
| 5744927 | Inverter control method and apparatus An inverter control apparatus and method for a motor driven by an inverter circuit. The primary current of the motor is detected by a detector circuit and is used in combination with a primary current command value to provide pulse-width modulation of the... | 04/28/1998 |
| 5714941 | Integral information and energy storage system An integral information and energy storage system is disclosed comprising a disk drive having a housing, a shaft rotatably mounted therein, and a disk platter coupled to the shaft. A flywheel is also coupled to the shaft and includes, embedded in the flyw... | 02/03/1998 |
| 5696642 | Circuit for controlling the rotation of a rotating member A circuit for controlling a rotating member is provided with an input capture register which reads out the value of a free running counter at a timing of an FG (frequency generated) pulse generated in accordance with a rotation of a rotating member. A cen... | 12/09/1997 |
| 5677605 | Brushless DC motor using phase timing advancement A drive system for a brushless DC motor uses pulse width modulation, and phase timing advancement to maintain a constant power output during high speed use. The arrangement is well suited for driving a brushless motor in an electric vehicle and the like.... | 10/14/1997 |
| 5642461 | Economical wide range speed control system A speed control system is disclosed wherein a brushless DC motor and a magneto resistive encoder are able to rotate a motor at arbitrarily low speeds. The motor is able to rotate at low speeds by having a filtered signal generated by an encoder applied to... | 06/24/1997 |
| 5617266 | Motor stabilizing control apparatus for use with motors, including for use with a drum motor in a magnetic tape system A motor speed control device includes a frequency signal generating circuit for generating a frequency signal proportional to a rotation frequency of a motor, a frequency measuring circuit for measuring a frequency of the frequency signal, a speed error s... | 04/01/1997 |
| 5590235 | DC motor control with periodic reset An electric motor (10) particularly a low-voltage collectorless dc motor, has a microprocessor (18, 40) with a reset input (24). Further, it has a device (26) which, during the running of the motor, generates signals (R) which depend upon the rotational p... | 12/31/1996 |
| 5572106 | Motor driving apparatus An apparatus for driving an electric motor according to a given control target, including a control circuit which generates a control command signal corresponding to the control target, a chopping signal generator which generates a chopping signal based o... | 11/05/1996 |
| 5451846 | Low current compensation control for thyristor armature power supply A control system for energizing a direct current (DC) motor with alternating current (AC) power includes a first voltage sensor for a peak voltage of AC power; a second voltage sensor for a counter electromotive force (EMF) of the motor; a current sensor ... | 09/19/1995 |
| 5433541 | Control device for controlling movement of a printing head carriage and control method for controlling the same A carriage motor control device that uses speed determination means (3) for determining a set speed value (SN12) to be set on the basis of an aimed angle value (SN13A) indicative of an aimed rotation angle, an aimed speed value (SN13B) indicative of an ai... | 07/18/1995 |
| 5375186 | Device for speed stabilization of a motor employing phase comparison An apparatus for stabilizing the speed of a motor has a phase comparator that identifies a phase difference between a reference signal and a speed signal. The apparatus acquires the speed of the motor and generates an output signal proportional to the ide... | 12/20/1994 |
| 5349278 | Torque oscillation compensation utilizing velocity feedback A torque oscillation compensation system and circuit that uses motor speed to compensate for electrical motor torque pulsations. An input source provides a torque/current command input signal that drives the motor by way of a controller, and a summing dev... | 09/20/1994 |
