Architecture for electric machine
AssigneePratt & Whitney Canada Corp.
InventorKevin Allan Dooley
Life of this patent
Estimating the term…
Abstract
The invention includes an electric machine having a rotor, stator and at least one winding in the stator adapted to conduct a current, and a secondary winding, electrically isolated from the first winding and inductively coupled to the first winding, which may be used to control at least one of the output voltage and current of the first winding.
Claims8
A method of controlling an alternator, the alternator having a permanent magnetic rotor, a stator having at least one core portion extending between a plurality of radial teeth, a first winding wound around the at least one core portion and a second winding adjacent a portion of the first winding, the first and second windings electrically isolated from one another, the method comprising the steps of:
- rotating the rotor to induce primary current in the first winding and a first magnetic circuit around the rotor, a first stator portion and the first winding, the primary current thereby inducing a secondary current in the second winding and a second magnetic circuit around said portion of the first winding, a second stator portion and the second winding, said portion of the first winding being remote from the first magnetic circuit;
- and
- controlling the current flow in the second winding to thereby limit the maximum current in the first winding.
A method of controlling a permanent magnet alternator, the alternator having a rotor, stator and at least one winding in the stator adapted to conduct an output current induced in the winding by rotation of the rotor, the rotor, stator and at least one winding comprising a rotor magnetic circuit, the method comprising the steps of:
- providing secondary winding electrically isolated from the at least one winding;
- placing the secondary winding adjacent a portion of the at least one winding;
- inductively coupling the secondary winding to the at least one winding and inductively isolating the secondary winding from the rotor magnetic circuit, such that in use the at least one winding induces at least a voltage in the secondary winding;
- and
- using the secondary winding to control at least one of the voltage and current of the at least one winding.
Dependencies are inferred from the claim text.