Speed control system for induction motor

Details Speed control system for induction motor Speed control system for induction motor

1980-07-16

1982-03-16

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318803, 318807, H02P 540

Patent

active

043203329

ABSTRACT:
An error amplifier is connected to both a tachometer generator for an induction motor and a command speed generator to produce an error signal corresponding to the difference between the actual motor speed and a command motor speed. A current limit generator connected to the tachometer generator generates a current limit signal which is subtracted from a motor current signal from a current sensor for the motor. A multiplier imparts to the resulting difference signal the polarity opposite to that of the error signal as determined by a polarity discriminator. The difference signal is added to the error and actual speed signals by an adder to form a command frequency signal. An inverter controls the motor in response to the command frequency signal.

REFERENCES:
patent: 3983463 (1976-09-01), Nabae et al.
patent: 4158801 (1976-06-01), Hirata
patent: 4160940 (1979-07-01), Wolf
Maag, R. B. "Characteristics and Application of Current Source/Slip Regulated AC Induction Motor Drives" Conference Paper, IEEE-IGA Annual Meeting, Cleveland, Ohio, Oct. 18-21-71.

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