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Class Information
Number: 388/831
Name: Electricity: motor control systems > Open loop speed control system for dc motor with commutator > Analog armature control > By pulse width or duty cycle modification
Description: Subject matter wherein energy is applied to the motor in the form of a series of pulses and the running speed of the motor is controlled by varying the width of the pulses or by periodic interruption of the pulses.










Patents under this class:
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Patent Number Title Of Patent Date Issued
7949235 Electronic module and arrangement for signal transmission with the former May. 24, 2011
7580617 Electric fan device and method of driving electric fan device Aug. 25, 2009
7567749 Motor control circuit Jul. 28, 2009
7398412 Measure controlled delay with duty cycle control Jul. 8, 2008
7348757 Circuit to improve motor phase current reconstruction via DC link Mar. 25, 2008
7321213 Motor controller Jan. 22, 2008
7321214 Motor control system Jan. 22, 2008
7298103 Control and motor arrangement for use in model train Nov. 20, 2007
7242857 Motor control circuit Jul. 10, 2007
7231139 Digital noise reduction for motors Jun. 12, 2007
7218846 Fan speed control circuit May. 15, 2007
7166976 Method and control circuit for reducing line-bound disturbances in a pulse-width modulated control of an electric motor Jan. 23, 2007
7006762 Pulse width modulator Feb. 28, 2006
6946809 Motor driving system Sep. 20, 2005
6912353 Brushless DC ring motor cooling system Jun. 28, 2005
6828748 Speed control circuit for a brushless dc motor Dec. 7, 2004
6693400 Multi-mode motor controller chip set Feb. 17, 2004
RE38406 HVAC fan-powered terminal unit having preset fan CFM Jan. 27, 2004
6433507 Spread spectrum motor control circuit Aug. 13, 2002
6424113 Method and apparatus for pulse width modulation Jul. 23, 2002
6353705 Speed control circuit of a direct current motor Mar. 5, 2002
6219603 Steering control apparatus for vehicle Apr. 17, 2001
6154605 Control device for diaphragm pump Nov. 28, 2000
6144176 Method for reducing acoustic and vibration energy radiated from rotating machines Nov. 7, 2000
6075331 Systems and methods for managing energy of electric power supply systems Jun. 13, 2000
6072293 Steering control system for vehicle Jun. 6, 2000
6037732 Intelligent power management for a variable speed fan Mar. 14, 2000
6021252 HVAC fan-powered terminal unit having preset fan CFM Feb. 1, 2000
5694020 Apparatus for controlling battery discharge Dec. 2, 1997
5666463 Reduction of electric motor surge current by non-linear limiting of rate of change of angular velocity Sep. 9, 1997
5526460 Impact wrench having speed control circuit Jun. 11, 1996
5457766 Fan speed control circuit Oct. 10, 1995
5450521 Pulse width modulator Sep. 12, 1995
5341891 Motor-driven power steering apparatus and method Aug. 30, 1994
5317669 Direct current motor speed control apparatus May. 31, 1994
5311106 Pulse width modulated electronic slot car controller May. 10, 1994
5291578 Apparatus for controlling a vehicle fuel pump Mar. 1, 1994
5271348 Drive arrangement Dec. 21, 1993
5136219 Electric-car controller Aug. 4, 1992
5119466 Control motor integrated with a direct current motor and a speed control circuit Jun. 2, 1992
5087865 Power governance circuitry Feb. 11, 1992
5000278 Motorized power steering apparatus Mar. 19, 1991
4991676 Motorized power steering apparatus Feb. 12, 1991
4989683 Motorized power steering apparatus Feb. 5, 1991
4986379 Motorized power steering apparatus Jan. 22, 1991
4856078 DC fan speed control Aug. 8, 1989
4841165 D. C. power controller Jun. 20, 1989
4772805 Lamp illumination adjusting apparatus Sep. 20, 1988
4748389 Motor speed control apparatus May. 31, 1988
4722021 Safety circuit for hand tools, and method for safe operation thereof Jan. 26, 1988

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