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 25 - Arrangements or methods for the control of ac-motors characterised by the kind of ac-motor or by structural details
Patents for H02P 25 - Arrangements or methods for the control of ac-motors characterised by the kind of ac-motor or by structural details (7,591)
12/1981
12/22/1981US4307325 Digital control system for electric motors in power tools and the like
12/16/1981EP0041846A1 Induction type positioning system
12/16/1981EP0041829A2 Motor speed control system
12/15/1981US4306181 Drive circuitry for electric motor
12/10/1981WO1981003586A1 Motor voltage controller device
12/01/1981US4303870 Power supply system for linear motor
11/1981
11/03/1981CA1111949A1 Automatic load seeking controller for a pumpjack motor
10/1981
10/27/1981US4297628 Energy economizer for induction motors
10/13/1981US4295084 Control apparatus of synchronous motor having thyristor converter
10/07/1981EP0037307A1 Speed control system for an induction motor with a double stator
10/01/1981WO1981002818A1 Microcomputer controlled power tool
09/1981
09/30/1981EP0036414A1 Regulating electronic device.
09/29/1981US4292571 Control device for controlling the rotational speed of a portable power tool
09/22/1981US4291264 Power factor control system for inverter-driven a-c induction motor
09/17/1981WO1981002651A1 Simplified power factor controller for induction motor
09/02/1981EP0034822A1 Speed control circuit for an electric power tool
08/1981
08/25/1981US4286202 Electronic damping of stepper motor
08/25/1981US4286180 Variable reluctance stepper motor
08/12/1981EP0033353A1 Method of controlling the speed of a drill, hammer-drill, or rotary hammer and apparatus therefor
08/11/1981US4283666 Speed control device for a home sewing machine
08/05/1981EP0033161A1 Method and control circuit for temperature monitoring of an electric motor
08/04/1981US4282570 Method and apparatus for controlling an output current of a controlled rectifier
06/1981
06/30/1981US4276506 Motor control circuit
06/30/1981US4276505 Microcomputer-based control apparatus for a load-commutated inverter synchronous machine drive system
06/30/1981US4276504 Control device for commutatorless motor
06/25/1981WO1981001777A1 Direct current motor without collector
06/23/1981US4275343 Back EMF controlled permanent magnet motor
06/16/1981CA1103305A1 Stepping motor excitation
06/03/1981EP0029606A1 Clutch motor arrangement
06/02/1981US4271385 Control system for commutatorless motor
05/1981
05/26/1981US4269493 Electromagnetic camera shutter control device
05/19/1981US4267914 Anti-kickback power tool control
05/12/1981US4267498 Drive equipment with two-phase synchronous motor
05/12/1981US4267493 Pre-step timer circuit for DC motor control
05/12/1981US4267490 Binary switching control circuit for an electrically adjustable patient chair
05/05/1981US4266175 Secondary thyristor control for AC wound rotor motors
04/1981
04/21/1981US4263540 Two-speed refrigerant motor compressor
04/16/1981WO1981001085A1 Regulating electronic device
04/14/1981US4262241 Control system for commutatorless motor driven through frequency converter
03/1981
03/31/1981US4259623 Series-wound electric motor and control system for governing the speed thereof
03/31/1981CA1098604A1 Tachogenerator processing circuits and motor speed control systems including such circuits
03/24/1981US4258302 Apparatus for maintaining synchronism of an inverter-synchronous machine drive system at light or zero machine loads
03/18/1981EP0025333A1 Motor speed control system and a food mixer incorporating such system
03/10/1981US4255695 Method and apparatus for control of inverter synchronous machine drive system
02/1981
02/24/1981US4253053 Reluctance electric motor drive systems
02/24/1981CA1096440A1 Commutator motor brush force control
02/17/1981CA1095979A1 Power supply for variable reluctance machine
02/04/1981EP0023465A1 Electrical regulation means for the hydraulic characteristics of a circulating device in a central heating arrangement
01/1981
01/28/1981EP0023116A1 PWM inverter device
01/21/1981EP0022663A1 PWM inverter device
01/21/1981EP0022457A1 Method of, and circuit for, controlling the detenting of multiphase stepper motors
01/20/1981US4246528 System for controlling alternating current motors
01/20/1981US4246527 Supply equipment for a synchronous machine
01/07/1981EP0021965A1 Printer with linear motor
01/07/1981EP0021434A1 Overspeed protective apparatus for a portable tool
12/1980
12/30/1980US4242626 AC Motor drive
12/23/1980US4241298 Speed control switch
12/16/1980US4240020 Control system for suppressing torque ripple in synchronous motor
12/09/1980US4238719 Rotatable transformer field excitation system for variable speed brushless synchronous motor
12/09/1980US4238715 Starting circuit for a trackbound electric propulsion vehicle having a synchronous linear motor
12/09/1980US4238689 Vacuum cleaner control system
11/1980
11/18/1980US4234838 Incremental motion motor controller
11/18/1980CA1089927A1 Optimized electric motor having controlled magnetic flux density
11/12/1980EP0018603A1 Anti-kickback power tool control
11/12/1980EP0018465A1 Control device and method of controlling the rotational speed of a portable power tool
11/12/1980EP0018385A1 Variable reluctance motor systems
10/1980
10/15/1980EP0016778A1 Variable reluctance motor systems
10/15/1980EP0016772A1 Variable reluctance electric motor systems
10/14/1980US4228383 Speed control circuit arrangement for an AC commutator motor
10/07/1980US4227128 Speed responsive motor control circuit
10/01/1980EP0016023A1 Electromagnetic driving device for positive displacement oscillating pumps.
09/1980
09/30/1980US4225812 Electric motor control system
09/23/1980US4224558 Selectable servo ratio and dual speed control system for large centrifuge units
09/18/1980WO1980001973A1 Electric drive with synchronous motor
09/16/1980US4223261 Multi-phase synchronous machine system
09/16/1980CA1085911A1 Electric motor having controlled magnetic flux density
09/16/1980CA1085901A1 Electromagnetic induction actuator for magnetic disc file
09/09/1980US4221999 Three-phase two speed A.C. motor
09/02/1980US4220440 Automatic load seeking control for a pumpjack motor
08/1980
08/19/1980US4217763 Asynchronous motor-driven machine having variable torque demand, such as household refrigerator compressors
07/1980
07/29/1980US4215303 Washing machine motor control system
07/29/1980CA1082765A1 Plural multiphase motor drive circuit
07/22/1980US4214195 Motor control circuits
07/15/1980US4213077 Speed control circuit for a universal electric motor
07/08/1980CA1081349A1 Electromagnetic vibrator
07/01/1980CA1080796A1 Static converter for variable reluctance machines
06/1980
06/17/1980US4208685 Disk storage apparatus having an electrically tuned head-carriage actuator
06/03/1980US4206395 Harmonic eliminating apparatus
05/1980
05/28/1980EP0011503A1 Device for controlling the speed of a washing machine motor
05/06/1980CA1077126A1 Stepping motor using extended drive pulses
04/1980
04/22/1980CA1076198A1 Static speed control circuit for polyphase induction motors
04/16/1980EP0009848A1 System for controlling the electric motors of refrigerating plants by a combustion engine
04/08/1980CA1075307A1 Power factor control system for ac induction motors
03/1980
03/11/1980CA1073524A2 Torque regulating induction motor control system
02/1980
02/26/1980US4190794 Alternating current motor with adjustable output torque by means of adjustable magnetic bars
02/19/1980US4189669 Circuit arrangement for generating a pulse-width modulated signal
01/1980
01/01/1980US4181876 Speed control circuit for electric motors
12/1979
12/27/1979WO1979001155A1 Electromagnetic driving device for positive displacement oscillating pumps
12/27/1979WO1979001134A1 Variable reluctance electric motor systems
12/27/1979WO1979001133A1 Variable reluctance motor systems
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