Invention Grant
- Patent Title: Motor starting and switching
- Patent Title (中): 电机启动和切换
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Application No.: US12869912Application Date: 2010-08-27
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Publication No.: US08305024B2Publication Date: 2012-11-06
- Inventor: Peter Unsworth , James Joseph Kinsella
- Applicant: Peter Unsworth , James Joseph Kinsella
- Agency: Baker Botts L.L.P.
- Priority: GBGB0421443.3 20040927; WOPCT/GB2005/003503 20050912
- Main IPC: H02H7/08
- IPC: H02H7/08

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.
Public/Granted literature
- US20110210615A1 MOTOR STARTING AND SWITCHING Public/Granted day:2011-09-01
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