Motor drive apparatus and motor driving method capable of simply

Details Motor drive apparatus and motor driving method capable of simply Motor drive apparatus and motor driving method capable of simply

1998-06-29

1999-12-28

Masih, Karen

Electricity: motive power systems

Induction motor systems

Primary circuit control

318430, 318432, 318138, 318245, 318439, 318139, 318376, 318379, 318293, 318294, H02P 528

Patent

active

06008619&

ABSTRACT:
A drive current and a regenerative current are alternately applied to a motor during a PWM (pulse width modulation) time period. The regenerative current is produced by an electromagnetic induction of an armature and flows in the opposite direction as the drive current. Therefore, a rotating speed of the motor is reduced, so that a speed-reduction following characteristic for the motor is improved. By varying the duty factor, the lengths of time during which the drive current and the regenerative current are flowing can be controlled. Thus, the speed of the motor can be controlled.

REFERENCES:
patent: 5675699 (1997-10-01), Yamamoto et al.
patent: 5809438 (1998-09-01), Noro et al.
patent: 5861724 (1999-01-01), Ackerson

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