Variable-speed three-phase drive

Details Variable-speed three-phase drive Variable-speed three-phase drive

H - Electricity

02

P

318/13

H02P 5/747 (2006.01)

Patent

CA 1036662

Abstract of the Disclosure 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 con- nected separately to a three-phase network. The slip ring rotors of the two asynchronous motors are connected, respectively, with the three-phase termi- nals of different uncontrolled rectifiers. The latter two rectifiers, to- gether 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 inver- ter. In accord with the invention, a switch is provided for connecting the three-phase terminals of the two rectifiers which are disposed on the res- pective 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.

241574

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