Motor control method and apparatus therefor

Details Motor control method and apparatus therefor Motor control method and apparatus therefor

1985-09-11

1987-02-03

Shoop, Jr., William M.

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

318286, 318280, 318469, 49 28, H02P 122

Patent

active

046410678

ABSTRACT:
The present invention discloses a technique to avoid catching a foreign object in a power window by detecting overload of the window drive motor and stopping or reversing the rotation of the motor in response to said detection. The reference value for detecting overload is updated in accordance with a actual load of the motor in each predetermined time interval .DELTA.T but, in the present invention, when the start of an increase of overload is detected, the beginning of time period .DELTA.T is started again from that time, and thereby detection of overload is always carried out within the shortest period. Moreover, a variety of check mechanisms are also provided for ensuring the fail-safe function of the apparatus and for enhancing reliability of the protective apparatus.

REFERENCES:
patent: 4347465 (1982-08-01), Goertler et al.
patent: 4468596 (1984-08-01), Kinzl et al.

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