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Class Information
Number: 318/799
Name: Electricity: motive power systems > Induction motor systems > Primary circuit control > Responsive to motor condition > Responsive to speed or rotation phase angle
Description: Subject matter wherein the means to sense is responsive to the speed or the rotational phase angle of the motor being controlled or a device driven by the motor.

Sub-classes under this class:

Class Number Class Name Patents
318/804 With controlled magnetic reactance 70
318/800 With controlled power conversion 544

Patents under this class:
1 2 3 4 5 6 7 8 9 10

Patent Number Title Of Patent Date Issued
5831405 High precision fan control/alarm circuit Nov. 3, 1998
5821714 Improvements in and relating to motors Oct. 13, 1998
5821725 Electric current compensation circuit for brushless motors for reducing ripples in output torques during phase change Oct. 13, 1998
5821727 Induction motor control unit Oct. 13, 1998
5818187 Motor and control for windshield wiper system Oct. 6, 1998
5818180 Voice coil motor feedback control circuit Oct. 6, 1998
5801505 Disk drive stiction release system Sep. 1, 1998
5796237 Efficiency control system for an induction motor Aug. 18, 1998
5796233 Multiple-stator induction synchronous motor Aug. 18, 1998
5786681 Active phase coil inductance sensing Jul. 28, 1998
5783924 Drive system comprising a motor, control means for controlling the motor, apparatus comprising the drive system, and method of controlling the motor Jul. 21, 1998
5777452 Corrector, apparatus, and a method for controlling the electromagnetic torque of an asynchronous machine Jul. 7, 1998
5773972 Transition detection circuit for detecting transitions in the state of an object of detection Jun. 30, 1998
5773944 Electric machine control system including a torque smoothing device Jun. 30, 1998
5767654 Apparatus and method for detecting motor position in PWM operation of a polyphase DC motor Jun. 16, 1998
5764016 Method for positioning a pen in a recording device Jun. 9, 1998
5761375 Brushless motor speed detection device Jun. 2, 1998
5751132 Electric motor monitoring circuit May. 12, 1998
5747963 Method for controlling an electric motor and electric apparatus May. 5, 1998
5747957 Method of controlling vectors in motor and vector-controlling inverter device May. 5, 1998
5729113 Sensorless rotor velocity estimation for induction motors Mar. 17, 1998
5715792 Method for controlling the advance angle of a power engine Feb. 10, 1998
5714861 Variable speed control for a hand-held electric power tool Feb. 3, 1998
5710500 Motor speed control apparatus using phase-advance based estimated disturbance signal Jan. 20, 1998
5703458 Capacitor-type motor speed controller Dec. 30, 1997
5698960 Motor servo system Dec. 16, 1997
5694017 Time delay compressed synchronous frame controller Dec. 2, 1997
5689170 Fail-safe control apparatus for electric vehicle driving motor Nov. 18, 1997
5684377 Apparatus for controlling an input power to an induction motor Nov. 4, 1997
5663626 Applied-voltage fuzzy control process for induction motors and device for performing it Sep. 2, 1997
5646497 Switching arrangement for controlling the rpm of electric motors Jul. 8, 1997
5638387 Electrically driven lift truck Jun. 10, 1997
5635806 Method and apparatus for temperature monitoring of universal or AC/DC motors Jun. 3, 1997
5627446 Induction motor control method May. 6, 1997
5625262 System for equalizing the load of a plurality of motors Apr. 29, 1997
5621296 Three phase motor conversion and monitoring circuit Apr. 15, 1997
5614817 Method and device for determining the real power of a DC electrical drive Mar. 25, 1997
5594312 Apparatus having an automatic firing arrangement Jan. 14, 1997
5561358 Variable speed pumping-up generator Oct. 1, 1996
5561355 Motor drive apparatus and method of controlling the same Oct. 1, 1996
5559418 Starting device for single phase induction motor having a start capacitor Sep. 24, 1996
5550450 Dead-time effect compensation for pulse-width modulated inverters and converters Aug. 27, 1996
5548198 Shared inverter electrical drive system Aug. 20, 1996
5543695 Medical instrument with programmable torque control Aug. 6, 1996
5542501 Apparatus for controlling an elevator to reduce vibrations created in a linear drive motor Aug. 6, 1996
5534763 Methods of and/or apparatus for electronically commutated motor control Jul. 9, 1996
5532571 Control apparatus for induction motor Jul. 2, 1996
5502365 Driving control apparatus of motor-driven compressor utilized for automobile Mar. 26, 1996
5481641 Motor control apparatus Jan. 2, 1996
5477121 Procedure and apparatus for compensating the slip of an induction machine Dec. 19, 1995

1 2 3 4 5 6 7 8 9 10

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