Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1994-03-01
1997-06-24
Sircus, Brian
Electricity: motive power systems
Induction motor systems
Primary circuit control
318254, H02K 1702
Patent
active
056420250
ABSTRACT:
A method for reduction of switch-on surges while operating an inductive rry current load is described, having a magnetizable core and three windings arranged in different connection patterns to a rotary current alternating network. A phase angle control unit provides at least a temporary phase operation of the voltages between the lines of the windings. The arrangement includes core sectors allocated to a winding being brought to pre-determined state of magnetization, at least two of three voltages between the lines of the windings having unipolar voltage halfwaves reduces to at least half their voltage-time surface being connected successively to the rotary current load according to the present phase shift of the voltages between the lines. After at least the duration of a length of one period of the last applied voltage between the lines, one of the three voltages having an effective value raised to one desired value or up to the nominal value of the remain voltage remaining switched on and then the other two phases also having a raised effective value being switched on in sequence.
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Freitag Stefan
Konstanzer Michael
Fraunhofer Gesellschaft zur Forderung der angewandten Forschung
Sircus Brian
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