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| Number | Title | Issue Date |
| 8058826 | Motor controller with hall sensor output misalignment compensation using delayed or shifted commutation In a normal operating mode, a motor controller provides motor drive current to windings of a motor based on sensor signals to drive the windings in a normal commutation sequence, and monitors for occurrence of a motor stall condition. Upon detecting the motor stall ... | 11/15/2011 |
| 7477034 | System and method for commutating a motor using back electromotive force signals A method for attenuating switching noise from back electromotive force (EMF) observations in a motor is described. The motor is controlled by pulse width modulation (PWM) signals provided at a PWM frequency. The method comprises sampling back EMF observed in the mot... | 01/13/2009 |
| 7443118 | Method and device for triggering an electric motor The invention relates to a method for triggering an electric motor, in particular, an electrically conducting motor with a rotor, where an emergency run is performed as a function of the presence of at least one erroneous sensor signal. The invention also relates to... | 10/28/2008 |
| 7436145 | Method and apparatus for controlling brushless DC motors in implantable medical devices Methods and apparatus for controlling a polyphase motor in implantable medical device applications are provided. In one embodiment, the polyphase motor is a brushless DC motor. The back emf of a selected phase of the motor is sampled while a drive voltage or the sel... | 10/14/2008 |
| 7408311 | Protection device for electric motor driving devices and corresponding driving device A protection device protects a driving device of an electric motor with at least three phases and at least three windings and the driving device comprises a power stage suitable for driving directly said at least three windings. The driving device is suitable for ac... | 08/05/2008 |
| 7408312 | Control device for permanent magnet synchronous motor A control device for a permanent magnet synchronous motor includes: an inverter 9 for converting inputted DC voltage into AC voltage of variable-voltage and variable-frequency, and driving a motor 14 with the AC voltage; a speed controller 22 fo... | 08/05/2008 |
| 7408322 | Device for determining constant of rotating machine A device for determining a constant of a rotating machine includes: a test number selector outputting a test number n, selected from 1 to N (N≧2), and outputting a phase signal q determined by a predetermined condition that is previously set based on the test numb... | 08/05/2008 |
| 7405916 | Control apparatus of semiconductor switch A control apparatus includes a plurality of load circuits, a power supply wiring line that connects the load circuits to a DC power supply in common, and a counter electromotive force detecting unit that detects counter electromotive force generated on the power sup... | 07/29/2008 |
| 7400101 | Method for detecting rotor angle of DC brushless motor and controller of DC brushless motor A method and an apparatus accurately detect a rotor angle of a DC brushless motor by using a first-order difference of a detected value of a phase current. A periodic signal causing the total sum of output voltages in three control cycles to become zero is superpose... | 07/15/2008 |
| 7385364 | System and method for detecting back electromotive force with automatic pole calibration A system and method for determining the rotational speed of a motor, such as a three-phase disk drive motor, detects back electromotive force voltage generated during operation of the motor with an automatic pole calibration to minimize or eliminating variations in ... | 06/10/2008 |
| 7378809 | Controller for controlling an electric machine A controller for an electric machine, in particular for a linear motor, is disclosed. The electric machine or linear motor includes a first machine section with windings and a second machine section with permanent magnets. The controller includes a memory which can ... | 05/27/2008 |
| 7375480 | Method and device for the production of two-channel or multi-channel pulse-width modulated rectangular pulses The invention relates to a method and a device for the production of two-channel or multi-channel pulse-width-modulated rectangular pulses. According to the invention, exactly one pulse is discharged within a period in each channel. The inception of a pulse in relat... | 05/20/2008 |
| 7375488 | Brushless repulsion motor speed control system A system for controlling the speed of a brushless repulsion motor having a series of switches mounted on a rotating armature for shorting circumferentially spaced armature coils comprising first stationary signaling means and a plurality of rotating detectors for ac... | 05/20/2008 |
| 7375486 | Method and circuit for controlling motor speed A method of controlling a rotational speed of a fan motor for a heat generating electronic component includes the following steps: (1) obtaining an original PWM pulse in response to an internal die temperature of the electronic component, the original PWM pulse havi... | 05/20/2008 |
| 7372227 | Apparatus for braking a synchronous machine A method is proposed for braking a synchronous machine 1, with the armature windings (u, v, w) of the synchronous machine 1 being short-circuited, optionally by interposing at least one braking resistor. In order to keep the braking moment constant ove... | 05/13/2008 |
| 7372223 | Electric drive control apparatus and method An electric drive apparatus has an electric motor having a rotor and a stator; and a magnetic pole position detecting portion having a sensor rotor attached to the rotor, and a sensor stator that is adjacent to the stator, and that is fixed to a case, and that exten... | 05/13/2008 |
| 7372225 | Barrier operator with flexible drive member A motorized operator for moving a barrier, such as an upward acting garage door, between open and closed positions includes a support mounted adjacent one of a pair of barrier guide tracks or along a barrier counterbalance shaft and a drive mechanism mounted on the ... | 05/13/2008 |
| 7368691 | Induction heating apparatus Apparatus for providing electrical power to at least one inductor wherein the at least one inductor is disposed to inductively couple the electrical power to an electrically conductive object to heat the electrically conductive object by inducing electrical current ... | 05/06/2008 |
| 7365506 | Motor driving device, motor driving method, and motor apparatus A motor driving part has half bridge circuits in which a high potential side drive transistor and a low potential side drive transistor are connected in series to each other, and a connection point therebetween serves as a stator winding driving terminal of each pha... | 04/29/2008 |
| 7365505 | Image forming apparatus using noise-resistant motor control device An apparatus for controlling a rotational motion of a motor is disclosed which includes: a signal generator generating a rotational state signal indicative of a rotational state of the motor; and a controller producing a control signal for controlling the rotational... | 04/29/2008 |
| 7365503 | Hall Effect sensor temperature compensator A system and method for compensating the output of an uncompensated Hall Effect sensor used to monitor an output shaft of an actuator. The actuator includes an output shaft, a magnet coupled to the output shaft, a motor for rotating the output shaft between a first ... | 04/29/2008 |
| 7365510 | Motor spindle control system and method In a method for measuring motor speed and position by detecting the back EMF generated during pole-pair interactions, a separate respective duration of a power phase suppression signal, that is set during back EMF detection, is stored in memory for each respective p... | 04/29/2008 |
| 7365468 | Motor stator having transposed winding layers An electric motor is provided with a multi-layered winding stator core configuration. A plurality of individual layers of wire strands are successively formed on each stator pole of a pole pair. Each winding layer is fabricated of the same relatively thin wire gauge... | 04/29/2008 |
| RE40250 | Pulse width modulation circuit controlling output current of an inverter circuit for motor-driven blower or electric vacuum cleaner The present invention provides a PWM control device wherein a microprocessor detects the rotational position of rotor of a brushless motor with respect to the amount of each current supplied from an inverter circuit for driving the brushless motor to the brushless m... | 04/22/2008 |
| 7362062 | Surgical machine and method for controlling and/or regulating a surgical machine To improve a surgical machine with a sensorless electric motor comprising a rotor and at least two motor windings, and with a motor controller for controlling and/or regulating the electric motor, so that the electric motor is operable with optimum efficiency at low... | 04/22/2008 |
| 7362063 | Motor spindle control system and method In a method for measuring motor speed and position by detecting the back-EMF generated during pole-pair interactions, fluctuations of a three-phase motor power supply that may affect back-EMF detection are reduced. One phase of the power supply is tristated for a ce... | 04/22/2008 |
| 7358692 | Alignment method An apparatus includes a motor including a rotor and a coil system comprising a first set of coils, a second set of coils, and a third set of coils; and a switching mechanism that connects the first set of coils and the second set of coils to a first polarity output ... | 04/15/2008 |
| 7358694 | Apparatus and method for determining normal start up of sensorless motor An apparatus and method determine a start-up of a sensorless motor. The apparatus includes an elapsed time determination unit, a motor velocity determination unit and an abnormal start-up determination unit. The elapsed time determination unit determines whether a p... | 04/15/2008 |
| 7358699 | Rotating electric machine with built-in control device The invention is intended to obtain a rotating electric machine with a built-in control device in which the control device is kept from receiving heat from a main body of the rotating electric machine and the control device can be cooled in a desirable fashion. A he... | 04/15/2008 |
| 7358693 | Motor drive control device Disclosed is a motor drive control device which uses mechanical switches configured in an H-bridge shape and can protect the mechanical switches from being damaged and minimize a voltage chattering problem occurring upon switching on and off The motor drive control ... | 04/15/2008 |
| 7358696 | Method and apparatus for PWM drive During PWM control in which an actuator (9) is connected between the output terminals of a bridge circuit made up of switching elements (121, 122, 221, 222) and power is applied to the actuator (9) with signals G1U, G1L, G2U... | 04/15/2008 |
| 7355307 | Rotary transformer for supplying electric power to a superconducting rotor A device for supplying electric energy to at least one superconductor, with the superconductor being cooled in a cooled region to at least one predetermined temperature for achieving superconductivity, includes at least one electric energy source, and a transformer ... | 04/08/2008 |
| 7352144 | Motor driving device having MOSFET, MOSFET, and motor having MOSFET Each connection point of three series circuits formed by connecting two MOSFETs in series between positive and negative terminals of a direct-current power source is connected to a driving coil of a motor. The MOSFET is composed of an FET main body, and a parasitic ... | 04/01/2008 |
| 7352143 | Interface circuit, power conversion device, and vehicle-mounted electric machinery system An interface circuit capable of reliably transmitting signal even when there is fluctuation in the potential difference in reference potentials between circuits between which signal transmission is carried out. An interface circuit 4 is comprised of a level s... | 04/01/2008 |
| 7348689 | Switching circuit and a method of operation thereof This invention relates to the operation of a switching circuit, such as a bridge circuit. The invention provides a method of generating pulsed first and second switching signals for switching first and second switches of a switching circuit further comprising an out... | 03/25/2008 |
| 7348739 | Motor driving apparatus A motor driving apparatus makes a carrier signal of an inverter be synchronized with a carrier signal of a DC/DC converter, and determines a phase difference between both the carrier signals based on a ratio of an input voltage inputted to the DC/DC converter and an... | 03/25/2008 |
| 7348740 | Motor control circuit for forward/reverse rotation A motor control circuit for forward/reverse rotation comprises a driving circuit, a switching circuit and a motor coil winding. The driving circuit has a driving source, a Hall IC and a driving IC. The driving source provides a signal to enable the Hall IC to output... | 03/25/2008 |
| 7348749 | Control device for synchronous motor A control device is provided for a synchronous motor, which drives the synchronous motor through a voltage operated PWM inverter and controls a torque and a speed of the motor, including a unit for causing a PWM carrier signal to have an arbitrary phase difference b... | 03/25/2008 |
| 7345440 | Method for starting single phase BLDCM having asymmetrical air gap A method for starting a motor having a stator, a rotor, a winding and an asymmetrical air gap is accomplished using several steps. The steps include: (a) providing the motor at standstill; (b) exciting the winding for a specific time period with a current impulse ha... | 03/18/2008 |
| 7342367 | Motor drive circuit, motor system, and motor drive method A circuit suitable for formation as a small sized IC, able to decrease the number of externally attached parts and reduce the size, and stably rotating a motor. When rotating a rotor 101 by three-phase drive signals U, V, and W generated based on a CLK signal... | 03/11/2008 |
