Variable-speed driving system

Details Variable-speed driving system Variable-speed driving system

1990-06-01

1991-03-12

Ip, Paul

Electricity: motive power systems

Induction motor systems

Primary circuit control

318798, 318803, 318811, 363 71, H02P 540

Patent

active

049995618

ABSTRACT:
A variable-speed driving system for 3-phase induction motor by potential-dividing D.C. power from a D.C. power supply into two D.C. powers, converting these two D.C. powers into 3-phase A.C. powers by means of series-connecting 3-phase inverters and delivering the 3-phasse A.C. powers to respective windings of the 3-phase induction motor. In order to equalize the output powers of the series-connected 3-phase inverters, circuits are provided which are operative in accordance with the voltage difference between the voltages input to said 3-phase inverters so as to control the modulation factors of the 3-phase inverters in the variable voltage/variable frequency mode and to control the voltages input to the 3-phase inverters in the constant voltage/variable frequency mode.

REFERENCES:
patent: 4392099 (1983-07-01), Kuniyoshi
patent: 4503316 (1985-03-01), Murase et al.
patent: 4644458 (1987-02-01), Harafuji et al.
patent: 4680525 (1987-07-01), Kobari et al.

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