Closed loop, microcomputer controlled pulse width modulated inve

Details Closed loop, microcomputer controlled pulse width modulated inve Closed loop, microcomputer controlled pulse width modulated inve

1979-08-03

1981-09-15

Truhe, J. V.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318802, 318805, H02P 534, H02P 742

Patent

active

042900018

ABSTRACT:
Closed loop control of a pulse width modulated inverter-induction machine drive system is accomplished with a pair of microcomputers. The first microcomputer generates a periodic interrupt signal and a reference signal representative of the desired magnitude of a preselected induction machine parameter, the reference signal varying in frequency and amplitude in accordance with an externally-varied frequency value and amplitude value, respectively. The second microcomputer, when interrupted by the first microcomputer, computes the difference between the first microcomputer reference signal magnitude and the actual preselected machine parameter magnitude and the difference between the actual inverter output current magnitude and a preset limit, and controls inverter thyristor conduction accordingly.

REFERENCES:
patent: 3538420 (1970-11-01), Klein
patent: 3593083 (1971-07-01), Blaschke
patent: 3775652 (1973-11-01), Bowler et al.
patent: 4028599 (1977-06-01), Zankl et al.
patent: 4078192 (1978-03-01), Fultz
patent: 4099107 (1978-07-01), Eder

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