Current limiter for an electrical actuator

Details Current limiter for an electrical actuator Current limiter for an electrical actuator

1988-12-23

1990-10-02

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

318434, 318432, 180 791, 180163, H02P 700

Patent

active

049610333

ABSTRACT:
The current limiter for an electrical actuator includes a switch for selectively controlling the current supplied to the electrical actuator. A detector detects the current level flowing through the electrical actuator and an electronic controller adjusts the duty ratio for the switch in order to limit excessive current. The electronic controller includes a comparator for comparing the current through the electrical actuator with an upper threshold level and a lower threshold level. The duty ratio is decreased gradually if the current exceeds the upper threshold level and is gradually increased if the current is below the lower threshold level. The duty ratio is sustained if the current is a range between the upper and lower threshold levels.

REFERENCES:
patent: 4182979 (1980-01-01), Douglas et al.
patent: 4427930 (1984-01-01), Berman et al.
patent: 4500820 (1985-02-01), Noto et al.
patent: 4514665 (1985-04-01), Melocik
patent: 4574226 (1986-03-01), Binder
patent: 4591014 (1986-05-01), Yasuda
patent: 4599548 (1986-07-01), Schultz
patent: 4618805 (1986-10-01), Hornung
patent: 4735271 (1988-04-01), Shimizu

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