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Class Information
Number: 318/606
Name: Electricity: motive power systems > Positional servo systems (e.g., servomechanisms) > Frequency- or phase-modulated systems
Description: Subject matter in which modulator means are provided wherein the command signal or feedback signal either frequency modulates, or phase modulates a system carrier. The system carrier is a wave suitable for being modulated to transmit intelligence. The modulation represents the information, and the original wave is used only as the carrier of the modulation. Combinations of phase and frequency modulation are commonly referred to as frequency modulation.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7397215 |
Modulation method for bridge circuits for the particular control of direct current motors |
Jul. 8, 2008 |
| 7317293 |
Displacement control system for a vehicle axle |
Jan. 8, 2008 |
| 7315142 |
Method for effecting the power-optimal control of BLDC motors |
Jan. 1, 2008 |
| 7308192 |
Motor drive control with a single current sensor using space vector technique |
Dec. 11, 2007 |
| 7259533 |
Method of controlling motor drive speed |
Aug. 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 |
May. 29, 2007 |
| 7190143 |
Pulse width modulation (PWM) rectifier with variable switching frequency |
Mar. 13, 2007 |
| 7126306 |
Motor control unit |
Oct. 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 |
Sep. 12, 2006 |
| 7102326 |
Motor speed variator and a driving method thereof |
Sep. 5, 2006 |
| 7084603 |
Motor control device |
Aug. 1, 2006 |
| 7075260 |
Motor controlling method and apparatus thereof |
Jul. 11, 2006 |
| 7049778 |
Inverter control apparatus and inverter control method |
May. 23, 2006 |
| 7026773 |
Multiphase motors with single point sensing based commutation |
Apr. 11, 2006 |
| 7023173 |
Apparatus for driving brushless motor and method of controlling the motor |
Apr. 4, 2006 |
| 6969968 |
Control device and controlling method of inverter |
Nov. 29, 2005 |
| 6876167 |
Method and apparatus for determining the rotational rate of a rotating device |
Apr. 5, 2005 |
| 6812666 |
Current sense IC with circuitry for eliminating ripple current error from motor current measurement |
Nov. 2, 2004 |
| 6763622 |
Amplitude detection method and apparatus for high frequency impedance tracking sensorless algorithm |
Jul. 20, 2004 |
| 6746211 |
Operation control method resonance frequency of reciprocating compressor |
Jun. 8, 2004 |
| 6735537 |
Procedure for measuring the current in each phase of a three-phase device via single current sensor |
May. 11, 2004 |
| 6727675 |
Motor control apparatus and motor control method |
Apr. 27, 2004 |
| 6696811 |
Method for regulating an electrical machine by means of a pulse-width modulation inverter |
Feb. 24, 2004 |
| 6664751 |
Method and arrangement for a controlling strategy for electronic components in a hybrid electric vehicle |
Dec. 16, 2003 |
| 6646409 |
Apparatus for controlling rotation speed of motor |
Nov. 11, 2003 |
| 6639376 |
Frequency characteristic identifying method and drive controlling apparatus |
Oct. 28, 2003 |
| 6597146 |
Method and apparatus to compensate for cyclic load disturbances in a control system |
Jul. 22, 2003 |
| 6489740 |
Spindle motor control method of optical disk recording and reproducing apparatus |
Dec. 3, 2002 |
| 6452356 |
Chopping energization control device for electric motor |
Sep. 17, 2002 |
| 6400107 |
Motor control device capable of driving a synchronous motor with high efficiency and high reliability |
Jun. 4, 2002 |
| 6380706 |
Electric power steering device |
Apr. 30, 2002 |
| 6330483 |
Optimal control system |
Dec. 11, 2001 |
| 6323610 |
Silent spin sine wave generator |
Nov. 27, 2001 |
| 6320344 |
Position control device |
Nov. 20, 2001 |
| 6259224 |
Electronic cancellation of DC motor noise |
Jul. 10, 2001 |
| 6259221 |
Method and apparatus for tuning motion control system parameters |
Jul. 10, 2001 |
| 6236174 |
Method and apparatus for driving a polyphase, brushless DC motor |
May. 22, 2001 |
| 6208110 |
Method for determining rotor position |
Mar. 27, 2001 |
| 6191513 |
Stator-controlled magnetic bearing |
Feb. 20, 2001 |
| 6163118 |
Method and apparatus for controlling a motor in a mass storage device |
Dec. 19, 2000 |
| 6144176 |
Method for reducing acoustic and vibration energy radiated from rotating machines |
Nov. 7, 2000 |
| 6121736 |
Control apparatus for motor, and motor unit having the control apparatus |
Sep. 19, 2000 |
| 6111383 |
Controller for feeding chopped electricity |
Aug. 29, 2000 |
| 6100661 |
Time-discrete phase-locked loop |
Aug. 8, 2000 |
| 6084368 |
Arrangement for the contactless inductive transmission of electric measurement values and/or electric energy between a rotor and a stator |
Jul. 4, 2000 |
| 6028411 |
Circuit and method for modulating the commutation frequency of a disc drive motor |
Feb. 22, 2000 |
| 6016043 |
Method and apparatus for controlling a motor in a disc drive by modulating the commutation angle |
Jan. 18, 2000 |
| 6013995 |
Method and apparatus for adaptive feedforward control with reduced noise during track seek operations |
Jan. 11, 2000 |
| 5920173 |
Feedback enhanced adaptively tuned vibration absorber |
Jul. 6, 1999 |
| 5920163 |
Phase detecting circuit of brushless motor and magnetic recording and reproducing apparatus using the same |
Jul. 6, 1999 |
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