Electricity: motor control systems inventions 04/07

20070092232 - Motor drive unit: A motor drive unit (100) includes a pulse train generator 38, a clock signal generator (18), and an energization signal generator (20). The pulse train generator (38) creates a pulse each time an edge of a square wave signal (Vrct) is detected, and generates a pulse train (Vpls). The clock... Agent: Cantor Colburn, LLP

20070086755 - Pulse width modulation drive and method for ornaments with movable components: A decoration device may include a low-friction drive line and a PWM controlled motor that reduces or eliminates the gearing needed to achieve appropriate speed and torque at the motor output shaft. In preferred embodiments, the decoration device is an ornament that includes a low friction interfaces to accommodate relatively... Agent: Fish & Richardson P.C.

20070081799 - Motor driving device and electric power steering apparatus: In a motor driving device where a motor having a winding wire with small inductance value is driven by a digital control means comprised of control means including a current command value calculating means, a current control means and a PWM control means whose sampling periods are different from each... Agent: Sughrue Mion, PLLC

20070081800 - System and method for controlling the rotating speed of a fan: A method for controlling the rotating speed of a fan is disclosed. The method includes the steps of: reading a standard temperature Tc of a central processing unit (CPU); reading a thermal diode's temperature Td and a system ambient temperature Ta; comparing Td with a minimum temperature Tl, such that... Agent: North America Intellectual Property Corporation