Electricity: motor control systems inventions 02/07

20070031130 - Control system of motors for rotating a disk and for positioning heads of a mass storage disk device: An integrated control and power driving system moves a read/write head carrying arm over the surface of a disk. The integrated control and power driving system is applicable to a spindle motor, a mass storage disk drive and a voice-coil motor, for example, and includes a first chip and a... Agent: Allen, Dyer, Doppelt, Milbrath & Gilchrist P.A.

20070031131 - System for measuring the position of an electric motor: An electronic system utilizing dynamic inductance changes in the windings of an electric motor to measure and monitor mechanical position. The method employs the AC component of the Pulse-Width Modulation (PWM) which is commonly used to drive motor windings without the need for injected AC signals or external position sensors.... Agent: Mountain Engineering Ii, Inc.

20070025707 - Driving apparatus for fan motor: A driving apparatus for fan motors, electrically connected between a pulse width modulation (PWM) signal generator and a controller, includes a converter electrically connected to the PWM signal generator, generating a first reference voltage according to the duty cycle of a PWM signal generated by the PWM signal generator; a... Agent: Birch Stewart Kolasch & Birch