Device for controlling an asynchronous motor

Details Device for controlling an asynchronous motor Device for controlling an asynchronous motor

1993-06-22

1995-04-18

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318805, H02P 540

Patent

active

054081696

ABSTRACT:
A control device for an asynchronous motor (2), notably intended for the drive system of an electric vehicle, comprises electric supply source (10) able to produce an AC supply voltage whose frequency (FAL) and amplitude (UAL) may be adjusted independently of one another. For a given frequency of the supply voltage, the amplitude of the voltage is able to vary between a minimum value and a maximum value, the difference between the frequency of rotation of the turning magnetic field in the vicinity of the rotor and the frequency of rotation of the rotor being maintained substantially constant as long as the amplitude of the supply voltage is less than the maximum value. Once the maximum value has been reached, the torque on the shaft of motor (2) is increased by increasing the slip.

REFERENCES:
patent: 4047083 (1977-09-01), Plunkett
patent: 4320331 (1982-03-01), Plunkett
patent: 4465961 (1984-08-01), Landino
patent: 4757248 (1988-07-01), Fujioka et al.
patent: 4814683 (1989-03-01), Okamoto et al.
IEEE Proceedings B. Electrical Power Applications; vol. 127, No. 2, Mar. 1980, Stevenage GB pp. 91-95.

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