Motor driving device, motor to be driven by the same device,...

Details Motor driving device, motor to be driven by the same device,... Motor driving device, motor to be driven by the same device,...

2007-05-15

2007-05-15

Donovan, Lincoln (Department: 2837)

Electricity: motive power systems

Positional servo systems

Pulse-width modulated power input to motor

C318S254100, C318S434000

Reexamination Certificate

active

10542484

ABSTRACT:
A motor driving device includes a motor having three-phase driving coils, a power feeder for powering the coils, and a power feeding controller for controlling a power feeding method. The controller controls electrical potentials of the coils in a period of applying a voltage to the coils to be a power-supply voltage potential or the grounding potential by turning on or off transistors in the power feeder during a first feeding period which starts from a motor halt status and ends when the motor is driven at a given speed. During a second feeding period where the motor is driven at a speed over the given speed, the controller controls the potential such that the coils are opened by turning off the transistors or the potential becomes the power-supply voltage potential. This structure allows the motor driving device to drive the motor at a lower noise with less vibrations.

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