DESIGN IMPROVEMENTS FOR FLUX SWITCHING MACHINES

WIPO Patent Application WO/2012/131353

A3

Disclosed herein is a design for flux switching machines with one or more armature windings which can deliver controlled torque, in either selected direction on start up, without the use of a mechanical position sensor. Flux switching machines without sensors can operate equally well in either direction. The invention discloses design features for such machines which improves the torque profile of the motor with angle. In three phase machines this delivers higher torque and lower ripple torque. In single phase flux switching machines the invention allows the rotor to be placed in a position where maximum torque can be delivered in either direction by selection of either positive or negative armature current. Rotor slotting is introduced to create a path of low permeability across a rotor tooth with minimal impact on the normal torque producing flux paths. Asymmetry of stator slots is used to further create a stable rotor position when energised by predominantly field means or armature means. Starting of the rotor from this stable position can be achieved in either direction. The method is suitable for starting permanent magnet flux switching motors. The invention results in low cost single phase motors which can start and run in either direction and three phase flux switching motors with improved performance over the prior art.

POLLOCK CHARLES (GB)
POLLOCK HELEN (GB)

PCT/GB2012/050671

July 18, 2013

March 26, 2012

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TECHNELEC LTD (GB)
POLLOCK CHARLES (GB)
POLLOCK HELEN (GB)

H02P6/00; H02K19/06; H02P25/08

WO2010015819A2

2010-02-11

JP2004096808A	2004-03-25
GB2454171A	2009-05-06
GB2455122A	2009-06-03

TALBOT-PONSONBY, Daniel (Fletcher House Heatley Road,The Oxford Science Park, Oxford OX4 4GE, GB)

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