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Class Information
Number: 318/434
Name: Electricity: motive power systems > Limitation of motor load, current, torque or force (e.g., preventing overload)
Description: Subject matter in which means are provided for preventing the load connected or applied to the motor, the armature or primary current of the motor, the watts supplied to the motor, or the torque or force exerted by the motor from merely exceeding a predetermined maximum or predetermined minimum value.

Patents under this class:
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Patent Number Title Of Patent Date Issued
6392373 Automatic reverse motor controller May. 21, 2002
6390205 Power tool system with programmable control unit May. 21, 2002
6388408 Motor current sensing in electric power tools May. 14, 2002
6384567 Controller and control method for motor/generator May. 7, 2002
6380704 Fan linear speed controller Apr. 30, 2002
6380706 Electric power steering device Apr. 30, 2002
6377007 Motor torque control device of electric vehicle Apr. 23, 2002
6377884 Method and device for controlling the drive train of a vehicle Apr. 23, 2002
6373211 Extended speed range operation of permanent magnet brushless machines using optimal phase angle control in the voltage mode operation Apr. 16, 2002
6369540 Bypass circuit for use in DC brush motor control Apr. 9, 2002
6366043 Dynamic torque reference limiting in torque-controlled permanent magnet motor drives Apr. 2, 2002
6366049 Motor starter and speed controller system Apr. 2, 2002
6362585 Controlling electric vehicle DC bus voltage ripple under step mode of operation Mar. 26, 2002
6359405 Failure detection system for a propulsion system Mar. 19, 2002
6359410 Apparatus and method for motor current protection through a motor controller Mar. 19, 2002
6356048 Method and device for controlling electric motors of the brushless direct-current type, particularly for moving the weft winding arm in weft feeders for weaving looms Mar. 12, 2002
6344722 Control device for a membrane pump Feb. 5, 2002
6337553 Circuit arrangement and method for operating and electrical motor Jan. 8, 2002
6338029 Method for determining when an electric motor is acceptable Jan. 8, 2002
6334503 Electrically operated power steering apparatus selectively restricting electric power supply to motor by using initial value and subsequent increase of temperature of heated portion therein Jan. 1, 2002
6335600 Motor drive unit and method of detecting malfunction of motor drive unit Jan. 1, 2002
6335608 Fault protection circuitry for motor controllers Jan. 1, 2002
6331941 Short circuit detection method and apparatus and motor drive incorporating same Dec. 18, 2001
6329777 Motor drive control apparatus and method having motor current limit function upon motor lock Dec. 11, 2001
6329778 Integrated system for powered surgical tools Dec. 11, 2001
6326750 Active reduction of torque irregularities in rotating machines Dec. 4, 2001
6326751 System and related methods for detecting and measuring the operational parameters of a garage door utilizing a lift cable system Dec. 4, 2001
6326758 Integrated diagnostics and control systems Dec. 4, 2001
6323611 Circuit for operating an electric motor Nov. 27, 2001
6323612 Motor driving device Nov. 27, 2001
6320338 Method of estimating motor torque constant Nov. 20, 2001
6320339 Control device for controlling current passing through a motor Nov. 20, 2001
6316893 Method and arrangement for adaptive load change compensation Nov. 13, 2001
6313593 Motor controller Nov. 6, 2001
6310456 Control system and method Oct. 30, 2001
6307346 Induction motor load limiting for power steering applications Oct. 23, 2001
6304048 Method and device for determining torque in an automotive power window system Oct. 16, 2001
6304053 Automatic firing change when motor leads swap on delta motor soft starter Oct. 16, 2001
6291953 Electrical drive system Sep. 18, 2001
6291954 Method and circuit arrangement for monitoring the operating state of a load Sep. 18, 2001
6291955 Motor drive control with low current limitation value Sep. 18, 2001
6291958 Temperature limiting controller for electric machines Sep. 18, 2001
6285148 Energization control device for electric motor Sep. 4, 2001
6281648 Thermistor actuated device for controlling the drive of a power window Aug. 28, 2001
6278251 Permanent magnetically excited electrical rotary drive Aug. 21, 2001
6278254 Programmable and interactive motor starter Aug. 21, 2001
6274991 Method and circuit configuration for detecting the rotational speed of electronically commutated fans Aug. 14, 2001
6271512 Optical system for detecting obstruction Aug. 7, 2001
6271637 Diagnostic system for electric motor Aug. 7, 2001
6272410 Electric power steering system Aug. 7, 2001

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