Motor control system and method

Details Motor control system and method Motor control system and method

1995-06-05

1997-08-26

Masih, Karen

Electricity: motive power systems

Automatic and/or with time-delay means

Responsive to thermal conditions

318472, 388934, 361 24, 160309, G05B 500

Patent

active

056613849

ABSTRACT:
This disclosure provides a motor control system and method that is preferably applied to cargo power drive units. Power is supplied to a motor having one or more windings and a thermocouple that is embedded in the motor windings. The thermocouple provides an electronic signal from which both motor temperature and rate of temperature change are derived. A motor control circuit uses these values to determine if a jam condition has occurred (as represented by improper temperature rise) or whether critical overheating is occurring. If so, the motor control circuit causes a power switch to disconnect power from one or more PDUs in the subject bank of PDUs. Power is temporarily disabled, until a cargo operator releases a joy stick control to a neutral position and then attempts to use it again.

REFERENCES:
patent: 3698539 (1972-10-01), Schwarbeck
patent: 3976925 (1976-08-01), Rudich, Jr.
patent: 4070610 (1978-01-01), Rudich, Jr.
patent: 4525763 (1985-06-01), Hardy et al.
patent: 4611682 (1986-09-01), Yasuda et al.
patent: 4673031 (1987-06-01), Wiemer

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