Apparatus for changing the relative phase angles of output shaft

Details Apparatus for changing the relative phase angles of output shaft Apparatus for changing the relative phase angles of output shaft

1981-05-22

1982-10-05

Weldon, Ulysses

Electricity: motive power systems

Plural, diverse or diversely controlled electric motors

Having electrical synchronizing interconnections

318 49, 318 50, 318112, H02P 154

Patent

active

043530150

ABSTRACT:
An apparatus for changing the relative angles of the output shafts of a multiple-motor electric drive. For this purpose, the appropriate synchronous motor is switched to a phase-shifting frequency changer and its relative shaft (mechanical phase) angle is shifted by varying the frequency. The synchronous motor is then switched back to the operating frequency changer. The phase equality of the output voltages of the two frequency changers is monitored by signals derived from logic elements driving the frequency changers. In normal operation, the phase shifting frequency changer is driven by the same digital frequency generator as the operating frequency changer and is only switched to another frequency generator for phase shifting. Transition from one frequency changer to the other is made without shock.

REFERENCES:
patent: 3428821 (1969-02-01), Ruffieux
patent: 3621348 (1971-11-01), Uchida et al.
patent: 3675098 (1972-07-01), Heiberger
patent: 3753002 (1973-08-01), Jacobson et al.
patent: 3908132 (1975-09-01), Krampe et al.
patent: 3967170 (1976-06-01), MacDonald et al.
patent: 3991350 (1976-11-01), Miyagoshi

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