U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Control system for a separately excited DC motor

Patent 5878189 Issued on March 2, 1999. Estimated Expiration Date: Icon_subject July 8, 2017. 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.

Patent References

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Method and apparatus for high efficiency operation of electromechanical energy conversion devices
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Turning speed controller for electric vehicles having dual drive motors
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Traction motor optimizing system for forklift vehicles
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Traction motor controller for forklift vehicles
Patent #: 5070283
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Optimizing system for vehicle traction motors
Patent #: 5264763
Issued on: 11/23/1993
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Speed-dependent traction motor controller for vehicles
Patent #: 5349279
Issued on: 09/20/1994
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Regulation system for decoupled efficiency optimized operation of DC traction motors
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Speed regulation of DC motor using current sensing means
Patent #: 5585706
Issued on: 12/17/1996
Inventor: Avitan

More ...

Inventors

Application

No. 889227 filed on 07/08/1997

US Classes:

388/801, Field control, or field and armature control, by digital or combined analog and digital circuitry318/432, CONSTANT MOTOR CURRENT, LOAD AND/OR TORQUE CONTROL388/907.5Computer or microprocessor

Examiners

Primary: Ro, Bentsu

Attorney, Agent or Firm

Foreign Patent References

  • WO91 15379 A WO. 10/10/1991
  • 93-19949 WO. 10/10/1993
  • 93-20611 WO. 10/10/1993

International Class

H02P 005/178

Abstract

A microprocessor based control system generates optimal field and armature currents for a separately excited DC motor. The current levels for the field and armature coils are set by feedback control. Armature and field current setpoints are established in accordance with tabulated values selected for providing a required torque and speed in an optimal fashion. A table of corresponding values of armature voltage is also maintained. If the actual armature voltage is below the calculated value, then the field current setpoint is boosted by an amount sufficient to optimize output torque.

Other References

  • Yamada Chihiro; Torque Measuring Method and Equipment and Torque Controller and Dynamometer Using the Former; Patent Abstracts of Japan, 06311775, 11 Nov. 1994
  • S Funabiki, T. Fukushima; Current Commands for High-efficiency Torque Control of DC Shunt Motor; IEE Proceedings-B, vol. 138, No. 5; Sep. 1991
  • Automatic Armature and Field control of DC Motors, M.H.Rashid; IEEE Proc, v 128, pt. B, No. 1, Jan. 1981, p. 73
  • Microprocessor-based Optimal-Efficiency Drive of an Induction Motor, Min Ho Park, Seung Ki Sul; IEEE Transactions on Industrial Electronice, vol. 1E-31, No. 1, Feb. 1984, p. 69
  • Microprocessor-Based Optimal Efficiency Drive of a Separately Excited DC Motor Soon Chan Hong, Min Ho Park (Source unknown, date unknown) pp. 126-128
  • Microprocessor-Based High Efficiency Drive of a DC Series Motor, Min Ho Park, Soon Chan Hong; IECON '84, p. 455
  • Microprocessor-Based High Efficiency Drive of a DC Series Motor, Soon Chan Hong, Min Ho Park; IEEE Transactions on Industrial Electronics, vol. IE-34, No. 4, Nov. 1987
  • Mathematical Modeling and Computer Simulation of a Separately Excited dc Motor with Independent Armature/Field Control, Isaac Avitan, Victor Skormin; IEEE Transactions on Industrial Electronics, vol. 37, No. 6, Dec. 1990
  • Improvement in Energy Efficiency of Induction Motors by means of Voltage Control, N. Mohan; IEEE Transactions on Power Applications and Systems, vol. PAS-99, No. 4, Jul/Aug. 198
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