Electricity: motor control systems inventions 08/08

20080199160 - Electric power steering device, and control method thereof: An actual detected current value and a target voltage value of an electric motor are subjected to a low-pass filter process, and amounts of change per time in the filtered actual current value and the filtered target voltage value are calculated. If the amount of change in the actual current... Agent: Oblon, Spivak, Mcclelland Maier & Neustadt, P.C.

20080199159 - Fan motor controller: A fan motor controller comprised of a power supply unit, three driving circuits., three power output circuits, a microprocessor, a voltage raising and compensation circuit, a Back-EMF sensing circuit, a current-limit protection circuit, and a speed control circuit. The fan motor controller eliminates the use of a Hall sensor, enables... Agent: Rosenberg, Klein & Lee

20080187298 - Vsd control: A compressor is powered by a motor which is, in turn, powered by a variable speed drive (VSD). The switching frequency and voltage/frequency relationship of the VSD may be adjusted dynamically to maximize efficiency.... Agent: Bachman & Lapointe, P.C. (utc)