Speed selection control for vehicle mounted electric accessory m

Details Speed selection control for vehicle mounted electric accessory m Speed selection control for vehicle mounted electric accessory m

1985-03-18

1986-10-07

Shoop, Jr., William M.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318345R, 318345C, 318345G, 318139, 318305, 322 28, 307 10R, H02P 500, H02P 1100

Patent

active

046161627

ABSTRACT:
A speed selection control is provided for a DC electric accessory motor having an armature winding and being mounted on a vehicle having a high reactance, multiphase alternator with a diode bridge rectifying output circuit, a battery connected across the output circuit and a voltage regulator controlling the voltage across the output circuit to a substantially constant voltage. One end of the motor armature winding is connected to the ungrounded end of the output circuit, and the other end of the motor armature winding is connected to the junctions of the diodes of each phase of the output circuit through a plurality of switched rectifiers, each having an anode connected to the other end of the motor armature winding and a cathode connected to the junction of the diodes of one phase of the output circuit. A switch control provides a continuous activation signal to selected numbers of the switched rectifiers, so that the motor armature receives electric power from the alternator in a substantially rectangular voltage wave with duty cycle determined by the number of switched rectifiers activated and thus the number of alternator phases used.

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Semiconductor Power Circuits Handbook First Edition, Motorola Semiconductor Product, Inc.

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