Motor starting and switching

Details Motor starting and switching Motor starting and switching

2005-09-12

2010-10-12

Ro, Bentsu (Department: 2837)

Electricity: motive power systems

Induction motor systems

Primary circuit control

C318S729000, C318S812000

Reexamination Certificate

active

07812563

ABSTRACT:
A method of starting and apparatus for starting a multiphase electrical machine is disclosed. The aim is to reduce oscillatory pulsation in torque generated by the motor and inrush current that occurs shortly after start-up. The starting method comprises the steps of first connecting at least one, but less than all, of a plurality of windings to a respective phase-shifted supply voltage at a controlled point in the supply phase. Then, after a controlled delay following the first connection, connecting the or each remaining winding of the machine a respective phase-shifted supply voltage. The invention has particular application to multiphase (most usually, 3-phase) motors. However, it can also be applied to other electrical machines, such as generators and transformers. The method can be performed at initial start-up or, in the case of application to a motor, at Y-delta switchover.

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PCT International Search Report PCT/GB2005/003503; dated Mar. 10, 2006.

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