Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Browse by Category: Main > Electrical & Energy
Class Information
Number: 388/820
Name: Electricity: motor control systems > Closed loop speed control system for dc motor with commutator > Analog armature control > By phase or frequency modification
Description: Subject matter wherein the control circuit functions by determining the phase or frequency relationship between a reference signal and a feedback signal and by applying an adjustment, based on this relationship, to the motor input.










Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8320750 Method for improving cooling capacity of a power station direct air-cooling system and the cooling system thereof Nov. 27, 2012
7764030 Control device for three-phase brushless motor Jul. 27, 2010
7741792 Motor control device Jun. 22, 2010
7728543 Stepping motor controlling device Jun. 1, 2010
7643733 Control device for driving a brushless DC motor Jan. 5, 2010
7576500 Method and system for operating a motor to reduce noise in an electric vehicle Aug. 18, 2009
7359628 Control device for an electric motor Apr. 15, 2008
6873124 Rotational speed controller for electrically powered tools Mar. 29, 2005
6380702 Commutator motor control system Apr. 30, 2002
6259224 Electronic cancellation of DC motor noise Jul. 10, 2001
6031966 Motor speed control device Feb. 29, 2000
5859511 Motor with input-controlled high side driver Jan. 12, 1999
5714861 Variable speed control for a hand-held electric power tool Feb. 3, 1998
5613259 High frequency electric toothbrush Mar. 25, 1997
5610594 Frequency monitoring device Mar. 11, 1997
5512810 Variable speed control for a hand-held electric power tool Apr. 30, 1996
5469148 Frequency monitoring device Nov. 21, 1995
5467004 Motor speed control apparatus for keeping the speed of the motor fixed in the presence of a disturbance torque Nov. 14, 1995
5140247 Control system for polyphase induction machines Aug. 18, 1992
5029040 Output circuit having a fail-safe function Jul. 2, 1991
4855655 Electromagnetic servo drive for power steering Aug. 8, 1989
4748389 Motor speed control apparatus May. 31, 1988
4710688 Variable speed control with selectively enabled counter circuits Dec. 1, 1987
4695778 Rotation phase control device Sep. 22, 1987
4695779 Motor protection system and process Sep. 22, 1987
4684856 Method and drive for elevator DC drive motor stabilization Aug. 4, 1987
4684858 Motor pulse extraction system Aug. 4, 1987
4661751 Well pump control system Apr. 28, 1987
4658191 Motor rotation control apparatus Apr. 14, 1987
4605884 Control unit Aug. 12, 1986
4591768 Control system for an electric motor May. 27, 1986
4571529 Actual speed value converter for the speed control in a motor drive system Feb. 18, 1986
4567409 Control circuit for motor Jan. 28, 1986
4544852 Circuit arrangement for monitoring speed of a drive motor Oct. 1, 1985
4498034 Motor speed control circuit Feb. 5, 1985
4495448 Means and method of sensing motor rotation speed from stray escaping flux Jan. 22, 1985
4482850 Control circuit for DC capstan motor Nov. 13, 1984
4480215 Synchronous electric motor control systems Oct. 30, 1984
4468597 Method for regulating the power supply to a direct-current motor and a device for the application of said method Aug. 28, 1984
4456859 Sewing machine drive motor control system Jun. 26, 1984
4450391 Centrifuge protective circuits for preventing excessive speed of different rotor types May. 22, 1984
4431950 Capstan drive system for high speed tape duplicator Feb. 14, 1984
4418304 Circuit for controlling rotation of motor Nov. 29, 1983
4417187 Circuit for controlling the speed of a motor Nov. 22, 1983
4390824 Full wave motor control circuit Jun. 28, 1983
4390823 Motor control system incorporating top speed limiting arrangement Jun. 28, 1983
4386300 Apparatus for reproducing disc record May. 31, 1983
4376914 Motor control device Mar. 15, 1983
4366399 Frequency discrimination circuit Dec. 28, 1982
4355268 Motor control apparatus Oct. 19, 1982

1 2










 
 
  Recently Added Patents
Towel clip
Method and apparatus for management and analysis of services in VoIP networks
Systems and methods for image stream processing
Vacuum switch and electrode assembly therefor
Generating agricultural information products using remote sensing
User control of replacement television advertisements inserted by a smart television
Image processing apparatus, image printing apparatus and printing data generation method
  Randomly Featured Patents
Cross bows
Ophthalmological method and instrument for producing dichoptic stimuli
Solid state graphite electrode
Cellulose dope and method for producing the same
Transmitter, receiver and method for controlling multiple input multiple output system
Rapid decarburization steelmaking process
Positioning of lower extremities artificial proprioceptors
Bearing assembly
Projection display device for projecting light that has been collimated
Bonding apparatus