Failure protection circuit for a two-motor lift truck

Details Failure protection circuit for a two-motor lift truck Failure protection circuit for a two-motor lift truck

1980-08-18

1984-09-18

Dobeck, B.

Electricity: motive power systems

Plural, diverse or diversely controlled electric motors

Running-speed control

318139, 318447, H03K 300

Patent

active

044726635

ABSTRACT:
An electrically operated dual motor drive system having first and second reversible traction motors (14, 16) driven by a power source (18). Motor control circuitry (10, 12) for controlling the direction of current flow through the motors (14, 16) is designed to be actuated by only two coils (36, 42). Preferably, control circuits (10, 12) employ an arrangement of normally open (32a, 32b, 38a, 38b) and normally closed (34a, 34b, 40a, 40b) contacts such that the two motors (14, 16) operate in reverse directions in the event of a complete system malfunction. A line contactor (20) is advantageously utilized to simultaneously serve as a main power disconnect for a variety of motors within the system.

REFERENCES:
patent: 3936709 (1976-02-01), Wright
patent: 3950681 (1976-04-01), Kern
patent: 3965402 (1976-06-01), Mogle
patent: 4028597 (1977-06-01), Delaney et al.
patent: 4054817 (1977-10-01), Gurwicz et al.
patent: 4081725 (1978-03-01), Schmidt et al.
patent: 4296361 (1981-10-01), Archer

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