Inverter control system which dynamically varies a voltage vecto

Details Inverter control system which dynamically varies a voltage vecto Inverter control system which dynamically varies a voltage vecto

1996-06-07

1998-08-25

Sircus, Brian

Electricity: motive power systems

Induction motor systems

Primary circuit control

318808, 318809, 318810, H02P 528

Patent

active

057986282

ABSTRACT:
An inverter control system for operating an induction motor calculates the primary magnetic flux vector and instantaneous torque value from the primary terminal voltage and primary current of the motor and produces a voltage vector to be delivered to the PWM inverter depending on the deviations of primary flux vector and instantaneous torque value from their command values and the phase angle of primary flux vector, with the switching of voltage vector being controlled so that the PWM inverter operates in a prescribed range of switching frequency irrespective of the period of calculation of the primary flux vector and instantaneous torque value. Setting the upper limit of switching frequency reduces the heat generation of the PWM inverter, allowing it to suffice with a smaller cooling device, and setting the lower limit of switching frequency reduces the magnetic noise and torque fluctuation of the motor.

REFERENCES:
patent: 5023538 (1991-06-01), Mutoh et al.
patent: 5166593 (1992-11-01), Doncker et al.
patent: 5225712 (1993-07-01), Erdman
patent: 5298848 (1994-03-01), Ueda et al.
patent: 5341081 (1994-08-01), Yamada
patent: 5365158 (1994-11-01), Tanaka et al.
Institute of Electrical Engineers of Japan, vol.B-10 6 No. 1, A Novel High-Response Torque control system for Induction Motors Based on the Instantaneous Slip Frequency Control. Takahashi et al. See Appln. p. 1, Jan. 1986.

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