AC motor control method and its control apparatus

Details AC motor control method and its control apparatus AC motor control method and its control apparatus

1986-10-02

1988-04-05

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318801, 318778, 318723, 318803, 363 10, 363 37, 363 51, H02P 318

Patent

active

047361484

ABSTRACT:
A self-extinguishing element such as a gate turn-off thyristor (GTO) is used for each arm of the inverter. A capacitive load is connected to the output terminal of the inverter. In a region where the output frequency of the inverter is low, the self-extinguishing element is forcibly commutated. In a high-frequency region, where the output frequency of the inverter is higher than that in the low-frequency region, the capacitive load causes the self-extinguishing element to be load-commutated.

REFERENCES:
patent: 4131937 (1978-12-01), Pelly et al.
patent: 4288732 (1981-09-01), Wilson et al.
patent: 4328454 (1982-05-01), Okuyama
patent: 4427933 (1984-01-01), Wagener et al.
Patent Abstracts of Japan, vol. 8, No. 155 (E-256) [1592], 19th Jul. 1984, & JP-A-59 56873 (Toshiba K.K.) 02-04-1984.
Patent Abstracts of Japan, vol. 8, No. 74 (E--236) [1511]; & JP-A-58 222 786 (Hitachi Seisakusho K.K.), 24-12-1983.

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