Flux damper for permanent magnet electric motors
AssigneeValeo Electrical Systems, Inc.
InventorsJack Winfield Savage, John Riden Suriano
Life of this patent
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Abstract
In an electric motor, a conductive ring surrounds, and shields, each pole of stationary magnet. When a changing magnetic flux, produced by an armature, penetrates the ring, by Lenz's Law, the changing flux causes the ring to produce a counter-flux, which adds to the changing flux. Consequently, the total flux within the ring tends to remain constant. Maintaining this constant flux tends to reduce noise and vibration which the changing rotor flux otherwise causes.
Claims14
In an electric motor, in which a rotating magnetic flux causes vibration in another component, the improvement comprising:
- a) a conductive ring, near the component, in which rotating flux induces a time-varying current.
In an electric motor, in which a rotating magnetic flux interacts with a component of the motor and causes vibration, the improvement comprising:
- a) maintaining a conductive loop near said component, through which said flux passes;
- and
- b) generating a current in said loop, when a change in said flux occurs, which generates a second flux, which opposes the change in the flux.
Dependencies are inferred from the claim text.