US Patent: 3,596,157 - Oscillator Energized Motor Control


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US Patent: 3,596,157

Oscillator Energized Motor Control

Patentee:

Richard Zechlin (exact or similar names) - Beloit, Rock County, WI

USPTO Classifications:

318/778, 327/460

Tool Categories:

electrical devices : electronic circuitry and apparatus

electrical devices : electric motors : motor controls

Assignees:

Fairbanks, Morse Inc. - New York, NY

Manufacturer:

Not known to have been produced

Witnesses:

Unknown

Patent Dates:
Applied:	Dec. 08, 1967
Granted:	Jul. 27, 1971

Patent Pictures:

USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Jeff Joslin
Vintage Machinery entry for Fairbanks, Morse & Co.

Description:

Abstract:

An electronic circuit is disclosed for controlling the starting and stopping of a motor. A polyphase source of alternating current is coupled to a plurality of transformers to provide a rectified DC input to an astable oscillator circuit. The output from the oscillator is coupled to a pulse transformer to control the operation of a plurality of pilot SCR's which function to energize a polyphase motor in accordance with the continuous output from the oscillator. The motor may be controlled in an AUTO mode such that a control signal (which may be generated by a suitable photosensor) provides a sufficient emitter bias on the unijunction transistor of the oscillator circuit to selectively terminate the output to the pulse transformer thereby removing the bias on the SCR's and shutting down the motor.