Permanent magnet rotary dynamo electric machine
AssigneeLucas Industried Limited
InventorJohn G. W. West
Life of this patent
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Abstract
A permanent magnet rotary dynamo electric machine wherein each permanent magnet pole is equipped with a flux shunt which provides a direct flux path between the airgap at the strong tip region of the pole and the iron circuit upon which the pole is supported, the direct flux path shunting magnetic flux to the iron circuit when the current in the associated winding is low, but being saturated by flux flowing in the opposite direction at high values of winding current.
Claims19
A permanent magnet rotary dynamo electric machine wherein each permanent magnet pole has a weak tip region and a strong tip region and is provided at said strong tip region only with a flux shunt in the form of a shield of material of high saturation flux density engaging the air gap face of the strong tip region of the pole and also engaging the part of the iron circuit of the machine upon whch the permanent magnet pole is supported so as to provide a direct flux path between the air gap at the strong tip region of the pole and the iron circuit, said direct flux path being arranged to shunt magnet flux from said strong tip region of each pole to the iron circuit when the current in the associated winding is low, but to be saturated by flux flowing in the opposite direction at high values of winding current, there being no flux shunt at the weak tip region of each pole.
Dependencies are inferred from the claim text.