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| Number | Title | Issue Date |
| 7429841 | Method and apparatus for movable element position detection in an electrically commutated machine A method and circuit for detecting the position of the movable element of an electrically commutated machine. The method and apparatus allow detection of the back electromagnetic force (BEMF) waveform with all legs of the machine energized by mathematically removing... | 09/30/2008 |
| 7397215 | Modulation method for bridge circuits for the particular control of direct current motors The invention relates to methods and systems for modulating the supply voltage of an electric load, particularly an electric motor, fed by a bridge circuit, wherein the load is switched as a function of a predetermined setpoint value for the input current or the inp... | 07/08/2008 |
| 7317293 | Displacement control system for a vehicle axle Provided is a motor control circuit in which the circuit structure is not complicated, which has a favorable response to the phase difference signal, and in which the signal variation caused by heat is small. This rotation control circuit of a motor includes: a PWM ... | 01/08/2008 |
| 7315142 | Method for effecting the power-optimal control of BLDC motors A method for a power optimal control of a BLDC motor by continuously updated commutation points and circuit assembly for a power optimal control of a BLDC motor. The method includes measuring a time difference (ΔT) between two immediately subsequent zero crossings ... | 01/01/2008 |
| 7308192 | Motor drive control with a single current sensor using space vector technique A drive system for a three phase brushless AC motor that is operative to optimize a transistor switching pattern to improve power output while allowing current measurement in all of the phases using a single sensor. This is achieved by defining a voltage demand vect... | 12/11/2007 |
| 7301333 | Angle position detection apparatus An angle position detection apparatus according to the present invention includes: a unipolar resolver and a multipolar resolver installed so that reluctance is changed in synchronization with the revolution of a direct motor drive; and a select switch is used to sw... | 11/27/2007 |
| 7259533 | Method of controlling motor drive speed Disclosed is a method of controlling drive speed of a motor operating in overload conditions. The method includes the steps of: driving the motor at a predetermined reference speed; detecting phase voltage and phase current applied to the motor; determining whether ... | 08/21/2007 |
| 7224138 | Method, system, and program product for feedback control of a target system utilizing imposition of a periodic modulating signal onto a command signal Feedback control of a target system is provided which utilizes the imposition of a periodic modulating signal onto a command signal of a controller. The command signal with the period modulating signal imposed thereon is input to the target system to be controlled. ... | 05/29/2007 |
| 7211985 | Training device On a training device, in particular for developing human muscles, having a torque-generating unit which comprises an electric motor and a reduction gearing, and whose output interacts with at least one training element offered to the exercising person, an electric m... | 05/01/2007 |
| 7190143 | Pulse width modulation (PWM) rectifier with variable switching frequency A method for controlling a device including a plurality of switching devices operated in accordance with a pulse width modulation technique includes receiving a reference voltage signal associated with a first pair of the switching devices. A switching signal is gen... | 03/13/2007 |
| 7132815 | Methods and devices for processing servo control signals Servo control signals and data content associated with two different devices, such as a hard disc drive magnetic head and a digital video disc laser may both be processed without substantial loss of data or control signal errors using a single controller. ... | 11/07/2006 |
| 7126306 | Motor control unit Windings of each phase in a three-phase AC motor are independent of one another. A motor control unit gives, to windings of each phase (U, V and W-phase), currents (IU, IV, IW) obtained by adding, to a fundamental sine wave current, a current having a frequency whic... | 10/24/2006 |
| 7106021 | Method, system, and program product for feedback control of a target system utilizing imposition of a periodic modulating signal onto a command signal Feedback control of a target system is provided which utilizes the imposition of a periodic modulating signal onto a command signal of a controller. The command signal with the period modulating signal imposed thereon is input to the target system to be controlled. ... | 09/12/2006 |
| 7106024 | Filter with increased first harmonic response and reduced phase shift in a wide frequency band for encoderless drive applications A method and apparatus for use with a controller that supplies voltages to an induction machine via supply lines, the voltages including a fundamental voltage component and an injected voltage component, the line voltages also including harmonic voltage components w... | 09/12/2006 |
| 7102326 | Motor speed variator and a driving method thereof A motor variator and a driving method thereof are provided for controlling the operating speed of a fan, which employ an alternate current chopper to change the working cycle and the rotary speed of a stepless motor. The motor variator includes a high-frequency alte... | 09/05/2006 |
| 7098737 | Variable inductor, oscillator including the variable inductor and radio terminal comprising this oscillator, and amplifier including the variable inductor and radio terminal comprising this amplifier An amplifier comprises an amplifier circuit which comprises a first inductor as an impedance element for degeneration, and a control circuit which has a second inductor electro-magnetically connected to the first inductor, and changes a control current flowing throu... | 08/29/2006 |
| 7084603 | Motor control device A motor control device that can reduce electrical noise is provided. A motor control device includes an inverter, a current controller, a high frequency wave superpositioner, and a high frequency wave setter. An inverter applies a current to the motor. A current con... | 08/01/2006 |
| 7075260 | Motor controlling method and apparatus thereof A voltage detection section and current detection section detect a voltage and current supplied to a motor, and the detected voltage and current are supplied to a position detection section. An angular speed output from the position detection section is supplied to ... | 07/11/2006 |
| 7049778 | Inverter control apparatus and inverter control method An interrupt signal is generated at each of rising timings of PWM signals which are produced on the basis of phase-shifted triangular wave carrier signals for phases, and voltage command values for the phases. At timings of the interrupt signals, A/D conversion of m... | 05/23/2006 |
| 7026773 | Multiphase motors with single point sensing based commutation System, method and apparatus for commutating a multiphase motor utilizing a single sensor. Commutation is carried out by employing a sensible system which incorporates phase commutating transition attributes. A motor is started by assigning a starting phase for a gi... | 04/11/2006 |
| 7023125 | Ultrasonic-motor driving apparatus An ultrasonic-motor driving apparatus includes an ultrasonic motor, a driving unit, and a characteristic storage. The driving unit is detachable from the ultrasonic motor and has a driving circuit for driving the ultrasonic motor. The characteristic storage provided... | 04/04/2006 |
| 7023173 | Apparatus for driving brushless motor and method of controlling the motor An apparatus for driving a brushless motor and method of controlling the motor, which actively changes an output time of a phase commutation signal depending on variation of a load and stably operating the motor in an overloaded state and improving an operational ef... | 04/04/2006 |
| 7019483 | Devices for position-controlled stopping of rotating components with position-controlled drive mechanisms in the case of voltage loss The position-controlled stopping of rotating components of shaftless drive mechanisms, in the case of a loss of voltage, is accomplished by the provision of an external connectable network. That external connectable network supplies the process power which is missin... | 03/28/2006 |
| 7015622 | Control apparatus for vibration type actuator and electronic apparatus using it The present invention discloses a control apparatus for a vibration type actuator that can perform the drive of a driven member in a short time. The control apparatus for a vibration type actuator that excites vibration in a vibration body by applying a frequency si... | 03/21/2006 |
| 7005817 | Energy conserving disc drive A disc drive includes a disc mounted to a rotatable spindle, a motor coupled to the spindle, and motor control circuitry. The motor has a motoring mode in which it rotates the spindle and a braking mode in which is decelerates the rotating spindle and generates powe... | 02/28/2006 |
| 6998726 | Method and system for providing single-phase excitation techniques to a start exciter in a starter/generator system A system and method is provided for starting a prime mover coupled to a synchronous starter/generator. The system includes an exciter converter that provides a non-fundamental only signal to a field winding of an exciter of the synchronous generator. The non-fundame... | 02/14/2006 |
| 6970793 | Apparatus and method for detecting malfunctions in high-pressure fluid pumps A fluid pump system includes a pump having a plurality of cylinders, each having an outlet port coupled to a high-pressure manifold. A pressure transducer is coupled to the manifold and configured to convert pressure levels of fluid in the manifold to a voltage sign... | 11/29/2005 |
| 6969968 | Control device and controlling method of inverter A carrier wave frequency generating unit 9 modulates a frequency f of a carrier wave in a triangular shape. Occurrence of drawbacks due to the frequency f of the carrier wave can thereby be prevented. Because the frequency f of the carrier wave can be easily ... | 11/29/2005 |
| 6956350 | Resonant scanning mirror driver circuit A resonant scanning mirror driver configured to drive a micro-electro-mechanical system (MEMS) mirror to a desired deflection utilizes a PWM pattern selected from patterns having 32, 40, 48, 56 or 64 bits. The patterns reflect the first positive and negative quarter... | 10/18/2005 |
| 6876167 | Method and apparatus for determining the rotational rate of a rotating device A non-invasive apparatus and method for measuring the speed of a rotating device that includes a sensor that measures a dynamic characteristic of the rotating device. A sample of the signal is transformed from the time domain into a frequency spectrum. The frequency... | 04/05/2005 |
| 6812666 | Current sense IC with circuitry for eliminating ripple current error from motor current measurement A circuit for recovering a current sense signal which is offset by a common mode displacement, such is the case when the signal is the voltage across a current sense resistor located on the high side bus or between the switches of a motor controller circuit. The cir... | 11/02/2004 |
| 6763622 | Amplitude detection method and apparatus for high frequency impedance tracking sensorless algorithm A control system for an electric motor including an inverter for providing power to the electric motor, a controller for controlling the inverter, a first motor speed control block in the controller injecting a high frequency signal into the electric motor to determ... | 07/20/2004 |
| 6746211 | Operation control method resonance frequency of reciprocating compressor An operation control method of a reciprocating compressor is disclosed in which, in case that a motor is overloaded, an operation frequency is increased to render magnetic fluxes of a magnet and an input current are mutually offset, so that a reciprocating compresso... | 06/08/2004 |
| 6735537 | Procedure for measuring the current in each phase of a three-phase device via single current sensor A method for measuring the current in each phase of a three-phase motor (26) by the sensor (32), the motor (26) being controlled by a plurality of switching devices (S1-S6) that receive pulse width modulation signals from a control... | 05/11/2004 |
| 6727675 | Motor control apparatus and motor control method A motor control apparatus comprises a fundamental current control device that controls a fundamental current in a 3-phase AC motor in an orthogonal coordinate system constituted of a d-axis and a q-axis rotating in synchronization with the rotation of the 3-phase AC... | 04/27/2004 |
| 6696811 | Method for regulating an electrical machine by means of a pulse-width modulation inverter The invention relates to a method for regulating an electrical machine (1) with an excitation winding (2) and a stator winding (3). The stator winding (3) is connected at its output terminals (10) to a converter bridge (5). The electrical machine (1) can ... | 02/24/2004 |
| 6664751 | Method and arrangement for a controlling strategy for electronic components in a hybrid electric vehicle A method for controlling a cooling arrangement for electronic components in a hybrid electric vehicle is disclosed. The method includes arranging an electronics cooling loop aboard a hybrid electric vehicle in which a DC to DC converter, DC to AC inverter... | 12/16/2003 |
| 6646409 | Apparatus for controlling rotation speed of motor An apparatus for controlling the rotation speed of a motor, which is capable of controlling the rotation speed and the torque of the motor by detecting the input voltage and the input current of the motor without using a sensor for detecting the position ... | 11/11/2003 |
| 6639376 | Frequency characteristic identifying method and drive controlling apparatus An instruction value is added to a specific signal to produce an added signal. A servo motor is driven based on this added signal. The response of the motor is measured while the motor is being driven. A characteristic value calculated based on the respon... | 10/28/2003 |
| 6597146 | Method and apparatus to compensate for cyclic load disturbances in a control system A method and apparatus for essentially eliminating cyclic disturbances in a motor control system, the method including identifying frequencies of undesirable components in a feedback signal that exceed a threshold level and generating a combined signal in... | 07/22/2003 |
