Stator coil driver circuit for a brushless DC motor

Details Stator coil driver circuit for a brushless DC motor Stator coil driver circuit for a brushless DC motor

1995-02-28

1997-03-25

Ro, Bentsu

Electricity: motive power systems

Constant motor current, load and/or torque control

318254, H02P 608

Patent

active

056147970

ABSTRACT:
A stator coil driver circuit for a brushless DC motor, which minimizes torque ripple by keeping the current in the commutating phases constant, is disclosed. The circuit includes a slew rate control circuit for ramping up the current or ramping down the current during commutation. The slew rate control circuit consists of a capacitor, a first current source for charging the capacitor, and a second current source for discharging the capacitor. The circuit also includes a sense resistor or a sensefet and an operational transconductance amplifier for providing feedback control.

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patent: 5397967 (1995-03-01), Carobolante et al.

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