Digital noise reduction for motors

Details Digital noise reduction for motors Digital noise reduction for motors

2007-06-12

2007-06-12

Donovan, Lincoln (Department: 2837)

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Field control, or field and armature control, by analog...

C388S800000, C388S811000, C388S819000, C388S831000, C318S254100, C318S434000, C318S685000, C318S696000

Reexamination Certificate

active

11238373

ABSTRACT:
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 in discrete steps thereby achieving the benefits of the linear controller topology.

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