Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...
Patent
1991-08-14
1992-11-24
Shoop, Jr., William M.
Electricity: motor control systems
Closed loop speed control system for dc motor with commutator
Armature control by digital or combined analog and digital...
388902, 388906, 364827, 364726, G06F 15332
Patent
active
051670020
ABSTRACT:
An apparatus and method for reducing synchronous speed variations in an electric motor having a rotating shaft, comprises a speed transducer for generating a continuous analog speed signal corresponding to the speed of the motor shaft including its synchronous and asynchronous speed variations. A trigger signal is generated each time the shaft rotates through a reference position and is used in conjunction with the speed signal in a fast Fourier transform analyzer to resolve the analog signal into a synchronous time averaged signal which varies with the synchronous speed variations but which eliminates the asynchronous speed variations. An arbitrary function generator is connected to the analyzer for generating an antiwave pattern having a frequency phase and amplitude relative to the waveform from the analyzer. The function generator is connected to a motor controller and superimposes the antiwave pattern onto a control signal internal to the controller which is thereafter applied to the motor. This reduces or eliminates the synchronous speed variations in the rotation of the motor shaft.
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Y. P. Gagnon, "Low-Frequency Vibration Analysis of Paper Machine Presses Using Displacement Transducers and the Synchronous Time-Averaging Method", Tappi Journal, Jul. 1987.
E. A. Page, "Vibration Analysis Pinpoints Gear Defects", Power Transmission Design, Mar. 1989.
Martin David
Shoop Jr. William M.
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