Transformer providing two multiple phase outputs out of phase wi

Details Transformer providing two multiple phase outputs out of phase wi Transformer providing two multiple phase outputs out of phase wi

1991-09-27

1992-07-14

Ip, Paul

Electricity: motive power systems

Induction motor systems

Primary circuit control

318807, 318811, 363153, 363 51, 290 38R, 417 22, H02P 124, H02M 514

Patent

active

051306280

ABSTRACT:
A three-phase transformer includes six windings, disposed in three pairs, all of which six windings are serially interconnected. A desired turns ratio between the two windings of each pair establishes a desired phase shift between one three-phase output of the connected windings and a second three-phase output of the windings. These two windings can be used in combination to drive a load, such as an induction motor, such as through a twelve pulse rectifier requiring two three-phase outputs out of phase by 30.degree.. Alternately, one of the three-phase outputs can be used to supply the full load of the motor directly. This is particularly useful in a electric submersible pumping system having a three-phase induction motor which is normally operated by a maintenance intensive twelve-pulse rectifier, which motor needs to be directly driven through a by-pass motor controller when the rectifier is in maintenance.

REFERENCES:
patent: 4106089 (1978-08-01), Fettinger
patent: 4565953 (1986-01-01), Espelage et al.
patent: 4712054 (1987-12-01), Boldt
patent: 4713554 (1987-12-01), Henderson
patent: 4713744 (1987-12-01), Coston
patent: 4761726 (1988-08-01), Brown
patent: 4833588 (1989-05-01), Schauder
patent: 4931715 (1990-06-01), Lee et al.
patent: 4948209 (1990-08-01), Baker et al.
patent: 5055762 (1991-10-01), Disser et al.
Prior public use or on sale (more than 1 year before Jun. 28, 1990) of transformer with six series connected primary windings for single three-phase input and single phase-shifted three-phase ouput per Information Disclosure Statement.

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