Regulation system for decoupled efficiency optimized operation of DC traction motors
March 21, 2014. 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 3735220 Control device for use in shunt motor Method and apparatus for operating DC motors at high efficiency System for driving DC motor Method and apparatus for high efficiency operation of electromechanical energy conversion devices Endoscope insertion assisting device Device for controlling the field current of DC motors Traction motor optimizing system for forklift vehicles Traction motor controller for forklift vehicles Patent #: 5070283 InventorApplicationNo. 216152 filed on 03/21/1994US Classes:318/493, CONTROL OF BOTH ARMATURE (OR PRIMARY) CIRCUIT AND FIELD (OR SECONDARY) CIRCUIT388/801Field control, or field and armature control, by digital or combined analog and digital circuitryExaminersPrimary: Martin, DavidAttorney, Agent or FirmInternational ClassH02P 005/16AbstractA regulation system for controlling a dc motor having a separately excited armature and field includes microprocessor based pulse width (duty cycle) and frequency modulation control of an armature amplifier and a field amplifier. Motor operating efficiency is optimized through microprocessor control of the field amplifier as a function of actual armature current, actual field current and desired armature speed. Sensed armature current is multiplied by a fixed optimal field constant to generate an optimal field current control signal. The optimal field current control signal is summed with a signal representative of field current required for desired armature speed less a signal representative of actual field current to generate a field current error signal. A controller receives the field current error signal and generates a pulse width modulated field current control effort signal which is applied to the field amplifier. An armature voltage controller receives an input signal which is the difference between desired armature speed and actual armature speed. The input signal is generated only when actual field current exceeds a predetermined field saturation current value. The controller generates a pulse width modulated armature control effort signal which is applied to the armature amplifier only if actual armature current is below the maximum allowable armature current.Other References
Field of SearchPrimary and secondary circuitsBoth armature and field structures rotatable or adjustable BATTERY-FED MOTOR SYSTEMS CONTROL OF BOTH ARMATURE (OR PRIMARY) CIRCUIT AND FIELD (OR SECONDARY) CIRCUIT CLOSED LOOP SPEED CONTROL SYSTEM FOR DC MOTOR WITH COMMUTATOR Field control, or field and armature control, by digital or combined analog and digital circuitry Field control, or field and armature control, by analog (only) circuitry By pulse width or duty cycle modification By phase or frequency modification By voltage or current modification With variable impedance By selection of windings Computer or microprocessor Operational/differential amplifier | |
