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| Number | Title | Issue Date |
| 8446115 | Motor drive device A motor drive device has a drive circuit for driving a motor, and a control section for controlling the drive circuit. The control section has a current command value calculating portion for calculating a current command value, a rotation calculating portion for cal... | 05/21/2013 |
| 8421396 | Motor controlling device A motor controlling device includes an encoder to output pulse signals with a predetermined angle interval as a rotor of a motor is rotated. An energized phase of the motor is sequentially switched by detecting a rotation position of the rotor based on a value of co... | 04/16/2013 |
| 8400086 | Initial rotor position detection for permanent magnet synchronous motors An apparatus and method for use with a PMSM detect the fall time or the rise time and the fall time of a motor current in the PMSM under different voltage vectors when the PMSM is in start-up to determine an initial rotor position for the PMSM at standstill. ... | 03/19/2013 |
| 8378605 | Method and apparatus for monitoring a system including a sensorless electric motor A multiphase alternating current permanent magnet synchronous electric motor is coupled to an actuator. A sensorless electric motor drive control system controls operation of the electric motor. An initial phase angle and a rotational speed of a rotor of the electri... | 02/19/2013 |
| 8344683 | Apparatus for sensorless positioning with signal amplifier A device and a method for determining the current position of a rotor, particularly the angle of rotation of the rotor, of an electric motor, wherein said device determines the current position of the rotor using the fluctuations of the armature current or the armat... | 01/01/2013 |
| 8294395 | Controller for AC rotary machine and controller for electric power steering A storage section stores three-phase detection currents and outputs them as three-phase storage detection currents and also stores three-phase voltage commands and outputs them as three-phase storage voltage commands. A second voltage command calculating section out... | 10/23/2012 |
| 8264189 | Motor controller and electric power tool having the same A motor controller is provided with a first PWM circuit that repeatedly outputs an on-signal at a first carrier frequency, a second PWM circuit that repeatedly outputs an on-signal at a second carrier frequency that is lower than the first carrier frequency, an AND ... | 09/11/2012 |
| 8228013 | Method and apparatus for automatically identifying electrical parameters in a sensor-less PMSM A method and apparatus for determining electrical parameters for commissioning a sensor-less permanent magnet synchronous machine uses knowledge of the rotor position to apply balanced pulses along the rotor magnet axis and perpendicular to the rotor magnet axis all... | 07/24/2012 |
| 8222856 | Control system without position sensors for a synchronous electric motor A control system for a motor, including a first detector providing signals indicative of the sign and zero-crossings of a supply voltage, and a second detector providing signals indicative of the sign and the zero-crossings of BEMF developed in the stator winding. A... | 07/17/2012 |
| 8188695 | Motor control device and drive device for hybrid vehicle A hybrid drive device includes a first motor; an operative mechanism that drivingly connects the first motor to an engine of a vehicle; a second motor that is drivingly connected to a drive wheel; an engine rotation speed sensor that detects a rotation speed of the ... | 05/29/2012 |
| 8188700 | Apparatus and method for driving sensorless motor An apparatus and a method for driving a sensorless motor are described and shown in the specification and drawings, where the method includes steps as follows. First, a control signal is acquired, where the control signal has information of a predetermined rotationa... | 05/29/2012 |
| 8106611 | Switching regulation circuit and dual-winding motor apparatus A switching regulation circuit for a dual-winding motor apparatus is provided. The switching regulation circuit comprises a gate-controlled device and a driving circuit. When one of the two windings generates an induced voltage signal greater than a threshold value,... | 01/31/2012 |
| 8076895 | Method and device for generating signals for controlling multi-phased rotating electric motor A method wherein the signals (SW1, Sw2, Sw3) controlling the power supply (10) of the phase windings (4) of the motor consist of signals (So1, So2, So3) that are out-of-phase by a phase angle (f) which is conti... | 12/13/2011 |
| 8035330 | Apparatus and method for driving synchronous motor The synchronous motor driving apparatus including position sensors provided in the synchronous motor, a current polarity detection circuit for detecting the polarities of the currents in the respective phase windings of the synchronous motor, an inverter driving the... | 10/11/2011 |
| 7977899 | Motor controlling device, motor drive system, method of motor control, semiconductor device and electronic device A motor control device is disclosed which is arranged so as to perform a PWM control for a permanent magnet motor including a rotor having a permanent magnet and a stator with a multiphase winding. The motor control device includes a position detection unit which ex... | 07/12/2011 |
| 7956562 | Motor and motor drive system Provided is a motor having a combination of a plurality of coil pairs and a permanent magnet, wherein these coil pairs are supplied with an excitation signal from a drive circuit so as to be excited at alternate opposite poles, and the permanent magnet is constitute... | 06/07/2011 |
| 7944168 | Device for controlling a rotating electrical machine A device for determining the position of the rotor of a rotating electrical machine. The invention is characterized in that the device comprises a plurality of magnetic field sensors stationary relative to the stator and adapted to deliver multiphase electric signal... | 05/17/2011 |
| 7944159 | Rotor orientation detection in brushless DC motors In order to determine the orientation of the rotor of a brushless DC motor 100, a sequence of current pulses may be applied to the stator phases U, V, W by the respective drivers HS0, LS0, HS1, LS1, HS2, LS2. The curr... | 05/17/2011 |
| 7898207 | Method for controlling a DC motor A method of controlling a motor to cause it to execute a move toward a target position including calculating a deceleration position, wherein when the deceleration position is reached, the motor will be caused to execute a deceleration in a manner that will result i... | 03/01/2011 |
| 7893639 | Motor control device A motor control device that includes a first speed estimator estimating the rotation speed of the rotor of a permanent-magnet synchronous motor and that controls the motor so that a first estimated rotation speed estimated by the first speed estimator follows the sp... | 02/22/2011 |
| 7893649 | Method and circuit arrangement for determining the rotor position of an EC motor in the standstill state A method and circuit arrangement for determining position of the rotor of an electronically commutated motor, wherein the rotor has magnetic axes having different permeances. Voltage is applied to stator phases, and resultant phase currents are monitored for purpose... | 02/22/2011 |
| 7839113 | Apparatus and method for driving synchronous motor The synchronous motor driving apparatus including position sensors provided in the synchronous motor, a current polarity detection circuit for detecting the polarities of the currents in the respective phase windings of the synchronous motor, an inverter driving the... | 11/23/2010 |
| 7755317 | Methods for electric vehicle motor control and rotor position detection fault-tolerant processing This invention provides methods for electric vehicle motor control and rotor position detection and fault-tolerant processing. The rotor position signal sampled by the system is compared with the previous rotor position θ0. When there is a sudden change,... | 07/13/2010 |
| 7667419 | Motor driving apparatus, motor driving method and disk driving apparatus A motor driving apparatus includes a virtual difference voltage detecting unit operable to detect a difference voltage between a virtual neutral point of a resistor circuit connected in parallel to motor coils and a terminal of a motor coil in non-conduction state, ... | 02/23/2010 |
| 7646164 | Method of adjusting parameters of a synchronous motor and variable speed drive using such a method The invention relates to a method of adjusting motor parameters in a variable speed drive intended for controlling a synchronous electric motor with permanent magnets M. The method comprises a step of determining the deviations ΔID and ΔIQ be... | 01/12/2010 |
| 7633259 | Method and apparatus for operating electrical machines A method and associated apparatus for operating an electrical machine includes providing a brushless excitation system including at least one rectifier having at least one diode. The method also includes providing at least one voltage amplitude limiter assembly incl... | 12/15/2009 |
| 7622882 | Position detection device for permanent magnetic machines The invention indicates a correct one of multiple rotor positions. For example, the invention can determine, in a PM machine, which of two possible positions a rotor is in when the position is known only within ±π radians. If the actual rotor position is known to ... | 11/24/2009 |
| 7592770 | Parking control technique for permanent magnet motor drives with sinusoidal BEMF A method and system for controlling a current regulator motor control for parking a motor rotor in a predetermined position, wherein a first current command and a first angle command are supplied to a current regulator for a first parking time, to move the rotor to ... | 09/22/2009 |
| 7560894 | Method and system in connection with permanent magnet synchronous machines A method and a system in connection with a speed and position sensorless permanent magnet synchronous machine equipped with an output filter and driven by an inverter, which method comprises the steps of forming a speed-adaptive full-order observer based on the dyna... | 07/14/2009 |
| 7492118 | Method and drive system for operating a synchronous motor In one aspect a method for operating a synchronous motor is provided. The method includes the following: Determining an electrical angle of rotation on the basis of a speed, with the synchronous motor being controlled according to the electrical angle o... | 02/17/2009 |
| 7492119 | Circuit arrangement for generating motor characteristic curves A circuit arrangement (1) for generating motor characteristic curves, in particular for stabilizing the pull-out torque of a two-phase synchronous motor (2) by using a series-connected element (14). The series-connected element (14) is co... | 02/17/2009 |
| 7402968 | Field winding synchronous generator-motor A field winding synchronous generator-motor includes: a power conversion section that is connected to an electric rotating machine and operating as a generator-motor, and that controls the electric rotating machine; a compensation amount storage section that stores ... | 07/22/2008 |
| 7385369 | AC fan motor driving circuit having capability of monitoring the rotation rate and status of the AC fan motor A driving circuit has a driving circuit module, a rotation rate detecting module and a rotation status detecting module. The driving circuit module is used to drive an AC fan motor and has at least a driving IC having two controlling outputs and a rotation status de... | 06/10/2008 |
| 7358698 | Field-winding type of synchronous machine A field-winding type of synchronous machine comprises a stator with an armature winding wound phase by phase, a rotor having a rotor core with a field winding wound, and a circuit enabling an armature current to pass the armature winding, the armature current corres... | 04/15/2008 |
| 7352151 | Method of estimating magnetic pole position in motor and apparatus of controlling the motor based on the estimated position A magnetic pole position in a synchronous motor having salient poles is estimated from an instructed voltage applied to the motor, a current generated from the instructed voltage and parameters. To estimate the position substantially matching with a true magnetic po... | 04/01/2008 |
| 7348744 | Brushless DC motor drive apparatus A brushless DC motor drive apparatus for driving a rotor includes a drive circuit rotating the rotor, a current shutdown and auto-restart circuit coupled to the drive circuit, and a DC voltage comparison circuit coupled to the current shutdown and auto-restart circu... | 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 |
| 7340969 | Rotation-detecting apparatus A rotation-detecting apparatus includes a rotation-detecting device for detecting a rotation of a rotor, a rotational speed-detecting device (3) for detecting a rotational speed of the rotor and a transfer signal-generating device for generating a digitized t... | 03/11/2008 |
| 7340968 | Back EMF measurement to overcome the effects of motor temperature change A motor torque measurement system includes a motor in communication with a gyro, a centrifuge rotor connected to the gyro, a housing surrounding the rotor and motor, and a controller in communication with the motor. The controller is connected to a back EMF measurem... | 03/11/2008 |
| 7339344 | Self tuning method and apparatus for permanent magnet sensorless control A plurality of parameters of a Permanent Magnet Synchronous Motor (PMSM) is determined by a motor controller for differentiating between a plurality of PMSMs. This is achieved by first applying regulated DC motor currents at a commanded fixed rotor angle and measuri... | 03/04/2008 |
