Electricity: motor control systems inventions 03/07

20070071421 - Digital permanent magnet electric motor: The Digital permanent magnet electric motor's basic use is to power vehicles in an economical manner. Its low speed high torque eliminates costly high maintenance torque converters (transmissions) now in use. The design makes the controller more reliable than current motor controllers.... Agent: Donald Frank Vaccarino

20070071422 - Electric tool: An electric tool having an inexpensive revolution speed control unit, the life of which is long. According to the intended use, the revolution speed of the motor can be changed from a low speed to a high speed and the revolution speed of the motor can be finely set only... Agent: Mattingly, Stanger, Malur & Brundidge, P.C.

20070053670 - Method and apparatus for pwm drive: During PWM control in which an actuator (9) is connected between the output terminals of a bridge circuit made up of switching elements (121, 122, 221, 222) and power is applied to the actuator (9) with signals G1U, G1L, G2U and G2L, driving timing signals are generated with a time... Agent: Steptoe & Johnson LLP

20070047927 - Digital noise reduction for motors: A system and method for reducing fan noise by controlling the drive current to the fan motor. In one embodiment the system approximates a linear drive using a number of transistors in parallel and sequentially deploying the transistors. In another embodiment, a scheme is used to activate and deactivate transistors... Agent: Maine & Asmus

20070047928 - Motor speed control integrated circuit: A motor speed control integrated circuit which controls a rotational speed of a motor by controlling the amount of current flowing through a drive coil of the motor. The integrated circuit comprises a first input terminal to have an analog speed-specifying signal in analog amount specifying the rotational speed of... Agent: SocalIPLaw Group LLP

20070047929 - Dc brushless fan motor driving circuit: A DC brushless fan motor driving circuit has a Hall PWM signal generator, a speed signal generator, a PWM driver and a full-bridge switching circuit. The Hall PWM signal generator obtains a Hall sine wave signal from an external Hall sensor and converts the Hall sine wave signal to a... Agent: Bacon & Thomas, PLLC