Variable-speed 3-phase drive

Details Variable-speed 3-phase drive Variable-speed 3-phase drive

1975-12-15

1977-06-28

Rubinson, Gene Z.

Electricity: motive power systems

Plural, diverse or diversely controlled electric motors

Mechanically coupled in fixed ratio of movement

318 84, 318197, 318237, H02D 736

Patent

active

040328244

ABSTRACT:
A variable-speed three-phase drive is disclosed. The drive includes a switchable, undersynchronous converter cascade for driving two mechanically coupled asynchronous motors which have slip ring rotors and which can be connected separately to a three-phase network. The slip ring rotors of the two asynchronous motors are connected, respectively, with the three-phase terminals of different uncontrolled rectifiers. The latter two rectifiers, together with two inverters and two other rectifiers, are arranged in a ring circuit in such a manner that two rectifiers are always followed by an inverter. In accord with the invention, a switch is provided for connecting the three-phase terminals of the two rectifiers which are disposed on the respective cathode sides of the two inverters, and for also connecting the three-phase terminals of the two rectifiers which are disposed on the respective anode sides of the two inverters.

REFERENCES:
patent: 3039034 (1962-06-01), Lee
patent: 3515969 (1970-06-01), Magnuson et al.
patent: 3531701 (1970-09-01), Shibata
patent: 3549968 (1970-12-01), Shibata
patent: 3683251 (1972-08-01), Pisecker

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