Stall protection circuit for an electronically commutated motor

Details Stall protection circuit for an electronically commutated motor Stall protection circuit for an electronically commutated motor

1990-04-05

1991-05-21

Shoop, Jr., William M.

Electricity: motive power systems

Alternating current commutating motors

318434, 361 23, H02H 708

Patent

active

050178466

ABSTRACT:
A control circuit for a system including an electronically commutated motor. A tachometer pulse signal generator generates a signal representative of the rotational speed of the rotatable assembly of the motor and having a duty cycle. The control circuit includes first and second motor voltage inhibiting circuits. The first inhibiting circuit inhibits application of the motor voltage to the winding stages of the motor in response to the tachometer pulse signal when the motor speed is below the preset minimum speed. The second inhibiting circuit inhibits application of the motor voltage to the winding stages in response to the tachometer pulse signal when the duty cycle of the tachometer pulse signal is outside a preselected acceptable range. Application of the motor voltage to the winding stages is inhibited when the motor is stalling as indicated by the motor speed being below the preset minimum speed or as indicated by the duty cycle of the tachometer pulse signal being outside the preselected acceptable range.

REFERENCES:
patent: 3824440 (1974-07-01), McIntosh
patent: 4290000 (1981-09-01), Sun
patent: 4370690 (1983-01-01), Baker
patent: 4500821 (1985-02-01), Bitting et al.
patent: 4509088 (1985-04-01), Profio
patent: 4553187 (1985-11-01), Burns et al.
patent: 4568996 (1986-02-01), McElhenny
patent: 4659976 (1987-04-01), Johanson
patent: 4725765 (1988-02-01), Miller
patent: 4763347 (1988-08-01), Erdman

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