Brushless dc motor having a motor-locked protective circuit

Electricity: motive power systems – Limitation of motor load – current – torque or force

Reexamination Certificate

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Details

C318S254100

Reexamination Certificate

active

11385878

ABSTRACT:
A brushless dc motor includes a PWM drive IC member, a Hall IC member, a PWM converter circuit and a Rotational Detection (RD) signal line. The PWM drive IC member electrically connects with the Hall IC member, the PWM drive IC member further includes a pin electrically connected with the PWM converter circuit. The RD signal line connects between the pin of the PWM drive IC member and the PWM converter circuit, and further connects with a RD signal source to supply RD signals to the pin of the PWM drive IC member. When the motor is jammed, the jammed RD signals can build a predetermined voltage which can determine the PWM drive IC member to be restarted or operated at a predetermined-speed mode. In this circumstance, no inrush current of the jammed motor will occur.

REFERENCES:
patent: 4544868 (1985-10-01), Murty
patent: 5963706 (1999-10-01), Baik
patent: 6392418 (2002-05-01), Mir et al.
patent: 7042180 (2006-05-01), Terry et al.
patent: 2001/0015633 (2001-08-01), Nishimura et al.
patent: 2002/0024313 (2002-02-01), Cho et al.
patent: 2002/0074969 (2002-06-01), Edelson
patent: 2002/0158600 (2002-10-01), Seima et al.

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