Patents
Sitemap › H02 - Generation, conversion, or distribution of electric power › H02P - Control or regulation of electric motors, generators, or dynamo-electric converters; Controlling transformers or reactors or choke coils › H02P 23 - Arrangements or methods for the control of ac-motors characterised by a control method other than vector control
Patents for H02P 23 - Arrangements or methods for the control of ac-motors characterised by a control method other than vector control (5,487)
02/1982
02/16/1982US4316130 Pneumatic device to control the speed of an electric motor
02/02/1982US4314189 Device for controlling the commutating angle of an inverter device
02/02/1982CA1117587A1 Control system for two-phase reversible motor
01/1982
01/19/1982US4311949 Semiconductor circuit for speed control of electric motors
01/19/1982CA1116746A1 Combined speed control and sectoring index for disc recorders and the like
01/12/1982US4310791 Induction motor control system
01/12/1982CA1116269A1 Tachometer system
12/1981
12/22/1981US4307325 Digital control system for electric motors in power tools and the like
12/08/1981US4305025 Velocity servo with adaptive tachometer feedback
12/01/1981US4303873 Reset windup limiting
12/01/1981CA1113604A1 Self adaptive speed control system
11/1981
11/17/1981US4301395 Phase-lock control device
11/17/1981CA1112741A1 Automatic control system with gain switching
11/10/1981US4300079 DC Motor control system
11/03/1981US4298834 Power dissipation regulating circuit for induction motor by supply voltage control in function of phase angle
11/03/1981US4298832 Digital motor speed controller
11/03/1981CA1111945A1 Servo system
11/03/1981CA1111906A1 Motor control system
10/1981
10/27/1981US4297628 Energy economizer for induction motors
10/27/1981US4297589 Speed governor for a hydroelectric unit
10/20/1981US4296446 Motor speed control circuit
10/20/1981US4296367 Speed control method for AC motors and an apparatus for the control
10/13/1981US4295171 System for controlling rotation of rotating structure
10/13/1981US4295081 Load actuating servomechanism with resonance equalization
10/01/1981WO1981002818A1 Microcomputer controlled power tool
09/1981
09/17/1981WO1981002651A1 Simplified power factor controller for induction motor
09/15/1981US4290001 Closed loop, microcomputer controlled pulse width modulated inverter-induction machine drive system
09/02/1981EP0034822A1 Speed control circuit for an electric power tool
09/01/1981US4287464 Power factor controller for an induction motor using transistor switch means with variable breakdown voltage
09/01/1981US4287458 Digital servo control circuit
08/1981
08/25/1981US4286203 Slip frequency control for variable speed induction motors
08/18/1981US4284942 Load driving apparatus
08/18/1981CA1107394A1 Magnetic recording and reproducing device
08/11/1981US4283671 Automatic residual phase error compensation circuit for a digital servo control system
08/11/1981US4283666 Speed control device for a home sewing machine
08/11/1981US4283665 Method and apparatus for eliminating ripple component from motor control loop
08/05/1981EP0033161A1 Method and control circuit for temperature monitoring of an electric motor
07/1981
07/21/1981US4280082 Digital DC motor speed control circuit
07/15/1981EP0031906A2 Method and apparatus for determining friction associated with an electric motor
07/14/1981US4278925 Phase-locked loop speed control system using programmable counter for frequency pulling
07/14/1981US4278924 Digital servo apparatus
07/09/1981WO1981001920A1 Energy recovery device for thyratron inverter
07/08/1981EP0031780A1 Device for energy recovery from an inverter
07/07/1981US4277736 Energy controller for conversion from a direct current source to a variable frequency load
07/07/1981US4277733 Slip recovery system for wound rotor motor
07/07/1981CA1104715A1 Photoelectric signal generating circuits
07/01/1981EP0031117A2 Method and device for controlling the torque and/or the number of revolutions of a converter-controlled asynchronous machine
06/1981
06/30/1981CA1104276A1 Method and apparatus for controlling and regulating the speed of a controlled movable structure
06/23/1981CA1103755A1 Induction motor control system
06/09/1981CA1102902A1 Method and apparatus for providing a stable, high gain servo system
06/02/1981US4271386 Power factor controller for induction motor
06/02/1981US4271382 Speed control circuit for phase-locked loop motor drive systems
06/02/1981CA1102408A1 Digital motor speed regulator and control system
05/1981
05/27/1981EP0029062A1 Power factor controller for induction motor
05/06/1981EP0028139A1 Sewing machine
05/06/1981EP0028138A1 Sewing machine
05/06/1981EP0027867A1 Control device for the driving mechanism of a stepping motor for adjustment of the stitch width and/or the feeding lenght in a sewing machine
05/05/1981US4266177 Power factor control system for AC induction motors
05/05/1981US4266176 Induction motor slip frequency controller
05/05/1981US4266175 Secondary thyristor control for AC wound rotor motors
05/05/1981CA1100608A1 Motor vehicle speed control system
04/1981
04/29/1981EP0027724A1 Reversible motor
04/21/1981US4263542 Method and circuit arrangement for controlling an asynchronous motor supplied from a static frequency changer
04/21/1981US4263541 Field control system for controlling induction machines
04/21/1981US4263540 Two-speed refrigerant motor compressor
04/01/1981EP0026039A1 Operation control apparatus for AC motors
04/01/1981EP0026038A1 Operation control apparatus for AC motors
03/1981
03/31/1981US4259698 Speed and phase servo control apparatus
03/31/1981US4259626 Servo control system operable on digital basis with limit cycle suppressed
03/31/1981CA1098604A1 Tachogenerator processing circuits and motor speed control systems including such circuits
03/05/1981WO1981000651A1 Variable speed electric machine having controlled magnetic flux density
03/03/1981US4254367 Digital servo circuit
02/1981
02/17/1981US4251793 PTC Resistor
02/17/1981CA1096043A1 Motor control system
02/17/1981CA1096015A1 Control device for turbines with speed and output control
02/10/1981US4250544 Combination microprocessor and discrete element control system for a clock rate controlled electronically commutated motor
02/03/1981US4249120 Variable speed induction motor control system
02/03/1981US4249119 Digital drive circuit for electric motor or the like
02/03/1981US4248321 Device for regulating the traveling speed of a motor vehicle
02/03/1981CA1094836A1 Heat pumps
01/1981
01/07/1981EP0021434A1 Overspeed protective apparatus for a portable tool
01/06/1981US4243927 Gain normalization technique for controlled current induction motor system
01/06/1981US4243921 Digital servo system for rotating member
12/1980
12/30/1980US4242625 Energy economizer for polyphase induction motors
12/30/1980US4242619 Digital servo control circuit
12/30/1980US4242618 Speed controller for rotary machine
12/30/1980CA1092645A1 Energy economizer for induction motors
12/24/1980WO1980002895A1 Power factor controller for induction motor
12/16/1980US4240014 Precision motor speed control system
12/10/1980EP0020211A1 Speed control device
12/09/1980US4238720 Equipment for the electronic speed control of an induction type motor, especially for use with data store motors
12/09/1980US4238716 Miniature vehicle dispenser spin-up speed control system
11/1980
11/25/1980US4236213 Apparatus for producing pulse width modulated signals
11/18/1980CA1089927A1 Optimized electric motor having controlled magnetic flux density
11/12/1980EP0018829A1 Inverter control apparatus, a vehicle drivetrain incorporating such apparatus, and a method of controlling an inverter for providing power to an a.c. machine
11/12/1980EP0018385A1 Variable reluctance motor systems
11/04/1980CA1089008A1 Closed loop digital control system and method for motor control
11/04/1980CA1089007A1 Stabilizing scheme for an a-c electric motor drive- system
10/1980
10/30/1980WO1980002346A1 D.c.motor speed control circuit
10/15/1980EP0017403A1 A method of, and apparatus for, operating an induction motor
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