Simultaneous independent control system for electric motors

Patent 4341982 Issued on July 27, 1982. Estimated Expiration Date:

July 3, 2000. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3211111

3315613

3909618

Power amplifier with current limiter circuit Patent #: 4290000
Issued on: 09/15/1981
Inventor: Sun

Inventors

Assignee

Power Systems, Inc.

Application

No. 06/165413 filed on 07/03/1980

US Classes:

318/51, Plural, diverse motor controls for different motors104/300, Car-carried speed regulator104/301, Of multiple trains on same track104/302, Reversing of car movement or conductor current318/107, A.C. and D.C.318/108, Different voltages318/109, Different voltages318/110, Different frequencies318/67, Diverse speeds for different motors318/87, Motor used as braking generator (dynamic braking)318/91Accelerating motors in succession or selectively

Examiners

Primary: Truhe, J. V.
Assistant: Indyk, Eugene S.

Attorney, Agent or Firm

Morse, Altman, Oates & Dacey

International Classes

G05D 1/00 (20060101)
A63H 19/24 (20060101)
A63H 19/00 (20060101)

Abstract

A system for simultaneously and independently controlling a plurality of electric motors from a number of dispersed stations. The system operates by transmission of duty cycle modulated selected frequencies superimposed on a DC track voltage on a common power line servicing the motors. The modulation is variable and determines the speed of the motors. Transmitters are portable and designed removably to plug into a common signal transmission cable anywhere along its length without interaction. Receivers, each tuned to a specific frequency and associated with and controlling a motor, are coupled to the common power line.