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Class Information
Number: 318/439
Name: Electricity: motive power systems > Motor commutation control systems
Description: Subject matter in which means are provided for facilitating or otherwise controlling commutation in commutator motors.

Patents under this class:

Patent Number Title Of Patent Date Issued
7288911 System and method for commutating a motor Oct. 30, 2007
7288910 Sensorless control in a permanent magnet machine Oct. 30, 2007
7288905 Integrated circuit and method for trainable control and operation of DC motor Oct. 30, 2007
7285931 Brushless motor commutation and control Oct. 23, 2007
7285930 Method and device for controlling a multiphase electronically commutated motor Oct. 23, 2007
7285929 Brushless motor commutation and control Oct. 23, 2007
7282888 AC fan motor driving circuit having detecting current wave capability Oct. 16, 2007
7282878 Systems for brushless DC electrical drive control Oct. 16, 2007
7282877 DC brush motor rotation amount detection method and apparatus Oct. 16, 2007
7282876 System for driving brushless DC motor and method of driving same Oct. 16, 2007
7279863 Method and apparatus for detecting excitation position of SRM by comparison of detected current Oct. 9, 2007
7279860 System and method for evaluating back electromotive force in a motor Oct. 9, 2007
7279859 EC motor and method for operating same Oct. 9, 2007
7279857 System, method, and computer-readable medium for reduction of commutation-related acoustic noise in a fan system Oct. 9, 2007
7276867 Controller arrangement with adaptive non-overlapping commutation Oct. 2, 2007
7274162 Motor spindle control system and method Sep. 25, 2007
7272303 Method and control circuit for driving an electric motor of a seatbelt retractor Sep. 18, 2007
7271559 Method and switching apparatus for recording the current in an electrical device Sep. 18, 2007
7271557 AC motor driving apparatus and method of controlling the same Sep. 18, 2007
7268509 Electric driven tool device Sep. 11, 2007
7268505 Electric machine and method of operating the electric machine Sep. 11, 2007
7268502 Method and arrangement for controlling the synchronous running of a plurality of electronically commutated motors Sep. 11, 2007
7265505 Control apparatus for selectively driving plural stator windings of synchronous motor Sep. 4, 2007
7262578 Direct control of an induction motor Aug. 28, 2007
7262576 Method for driving a synchronous electric motor in particular for fans Aug. 28, 2007
7262570 Motor controller with enhanced noise immunity unbuffered hall sensors Aug. 28, 2007
7262569 Electronic rotor pointing with high angular resolution Aug. 28, 2007
7260319 Abnormality monitoring device for motor control system Aug. 21, 2007
7259531 Speed control of brushless DC motors Aug. 21, 2007
7256564 System and method for attenuating noise associated with a back electromotive force signal in a motor Aug. 14, 2007
7256561 Method for operating a rotating electrical machine Aug. 14, 2007
7256558 Brushless motor and disk drive device using the same Aug. 14, 2007
7253581 Data storage device, motor control device, and motor control method Aug. 7, 2007
7253574 Effective switching frequency multiplier inverter Aug. 7, 2007
7250794 Voltage source converter Jul. 31, 2007
7250735 Driving circuit of a fan Jul. 31, 2007
7250733 Circuit arrangement and method for controlling a brushless, permanently excited direct current motor Jul. 31, 2007
7248006 Electronically controlled electric motor Jul. 24, 2007
7245097 Motor control system and vacuum pump equipped with the motor control system Jul. 17, 2007
7242175 Determining rotation of a freewheeling motor Jul. 10, 2007
7242160 Starting method for Hall-less single-phase BLDCM Jul. 10, 2007
7239102 Phase adjustment circuit, motor driving control circuit, and motor apparatus Jul. 3, 2007
7239098 Digital adaptive sensorless commutational drive controller for a brushless DC motor Jul. 3, 2007
7235946 Actuator current control method Jun. 26, 2007
7235941 Phase commutation method of brushless direct current motor Jun. 26, 2007
7235938 Motor drive and magnetic disc apparatus Jun. 26, 2007
7233123 Electrical machine rotor position identification Jun. 19, 2007
7233121 Fan speed control circuit Jun. 19, 2007
7231139 Digital noise reduction for motors Jun. 12, 2007
7230400 Electronically commutated motor Jun. 12, 2007

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