Electricity: motor control systems inventions 05/07

20070122125 - Motor controlling circuit and method: A motor control circuit includes: a detector outputting a detection signal in accordance with the motor rpm; a counter counting the number of clocks in accordance with a rotational cycle represented by the detection signal; a controller counting a DC motor based on the count value; and a divider dividing... Agent: Mcginn Intellectual Property Law Group, PLLC

20070110410 - Stationary position detection circuit and motor drive circuit: A stationary position detection circuit and a motor drive circuit capable of more properly detecting the rotor position are disclosed. The stationary position detection circuit supplies an alternating current to each phase load of the motor. The time during which the current flows in a first direction and the time... Agent: Buchanan, Ingersoll & Rooney PC

20070104468 - Motor control apparatus: A motor control apparatus includes a target value computation device which computes a target value of a current to be passed through a motor, a current detection device which detects a current passed through the motor, a command value computation device which computes a command value to the motor based... Agent: Osha Liang L.L.P.

20070098373 - Dc motor drive unit: In a DC motor drive unit having an open loop control system, a judgment is made as to whether an externally supplied speed instruction data instructs driving of the DC motor or not, based on the speed instruction data itself. If a judgment is made that the speed instruction data... Agent: Hogan & Hartson L.L.P.

20070098374 - Information processing apparatus and fan control method: According to one embodiment, an information processing apparatus includes a main body, a fan which is provided in the main body and is driven by a pulse width modulation signal (PWM signal), and a fan control unit which varies a duty ratio of the pulse width modulation signal (PWM signal)... Agent: Blakely Sokoloff Taylor & Zafman