Circuit and method of driving a DC motor

Details Circuit and method of driving a DC motor Circuit and method of driving a DC motor

1992-06-01

1994-11-08

Ip, Paul

Electricity: motive power systems

Positional servo systems

Pulse-width modulated power input to motor

318254, 318603, H02K 2500, H02K 2900

Patent

active

053630289

ABSTRACT:
A circuit and a method of driving a DC motor is provided in which a DC power to be supplied to the DC motor is oscillated in phase for producing a variable torque. As the torque is varied, its peak value increases while its average remains unchanged. Hence, the maximum torque needed for starting rotation will successfully be obtained. Once the rotation starts, a lower torque is accepted for continuous rotation of a load. The rotation can thus be conducted by a lower amplitude of the variable torque. Accordingly, when the rotating torque of the motor becomes low due to increase in unwanted load or declination in capability, the motor can remain operable without troublesome repair or replacement.

REFERENCES:
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patent: 4631459 (1986-12-01), Fujioka et al.
patent: 4641066 (1987-02-01), Nagata et al.
patent: 4642543 (1987-02-01), MacMinn
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patent: 4717864 (1988-01-01), Fultz
patent: 4835448 (1989-05-01), Dishner et al.
patent: 4879498 (1989-11-01), Shinohara et al.
patent: 4928043 (1990-05-01), Plunkett
patent: 5028852 (1991-07-01), Dunfield
patent: 5177416 (1993-01-01), Inaji et al.

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