Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...
Reexamination Certificate
2007-07-26
2009-08-25
Ip, Paul (Department: 2837)
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Armature control by digital or combined analog and digital...
C388S831000, C318S268000, C318S400040, C318S400140, C318S400170
Reexamination Certificate
active
07580617
ABSTRACT:
An electric fan device includes a motor which drives an electric fan for a vehicle, a control switch which controls a motor current supplied to the motor, and a control unit which controls an on/off operation of the control switch with pulse-width modulation. The control unit outputs a PWM pulse having a main PWM pulse and a vibration reducing pulse within one cycle to the control switch.
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Ip Paul
Sughrue & Mion, PLLC
Yazaki -Corporation
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