Conveyance with electronic control for left and right motors

Details Conveyance with electronic control for left and right motors Conveyance with electronic control for left and right motors

1986-11-04

1990-03-06

Ro, Bentsu

Electricity: motive power systems

Plural diverse motor controls

Running-speed control

318 56, 318 60, 318139, 318375, 318599, H02P 729

Patent

active

049069063

ABSTRACT:
A conveyance (10) is provided with: automatic limiting (223) of the rate of change in power supplied to left (26a or 232a) and right propulsion motors, whether electrically or hydraulically propelled; dynamic braking of electric propulsion motors (26a and 26b) that is achieved by shorting a motor winding (150a) during a portion (233a) of an interval (217a) between power pulses (207a) of a pulse-width-modulated driving voltage (209a); power-off braking that is achieved by shorting a motor winding (150a) when no power pulses are being supplied; extended life of relays (144a & 148a) that is achieved by preventing current flow to the motors during opening and closing of the relay contacts (154a and 156a); and a solid-state switching device (168a and 170a) that is controlled by a signal in a single conductor (200a) and that provides an effective delay (219a and 221a) in switching between two circuits (152a and 160a).

REFERENCES:
patent: 3260912 (1966-07-01), Gregory
patent: 3582747 (1971-06-01), Kearns
patent: 4415049 (1983-11-01), Wereb
patent: 4500818 (1985-02-01), Konrad et al.
patent: 4604557 (1986-08-01), Cowles
patent: 4667136 (1987-05-01), Bell
patent: 4677356 (1987-06-01), Tsuneda et al.
Irving M. Gottlieb, "Electric Motors & Electronic Motor-Control Techniques", Howard W. Sams & Co., Inc., Publication 2/340, p. 133.

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