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

A - Human Necessities

61

G

342/29.6

A61G 5/04 (2006.01) B60L 7/00 (2006.01) B60L 11/18 (2006.01)

Patent

CA 1292795

Abstract CONVEYANCE WITH ELECTRONIC CONTROL FOR LEFT AND RIGHT MOTORS 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 t 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).

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