Line start two-speed brushless motor
AssigneeHamilton Sundstrand Corporation
InventorJacek F. Gieras
Life of this patent
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Abstract
An electric motor is disclosed that includes a stator winding defining a plurality of poles, with the winding being controllable to switch between a first number of poles and a second number of poles. A rotor rotatable within the stator includes a first group of magnetic flux barriers being without permanent magnet material and a second group of magnetic flux barriers at least partially filled with a permanent magnet material. A method of operating a line-start electric motor is also disclosed.
Claims20
An electric motor comprising:
- a stator including a winding defining a plurality of poles, wherein the winding is controllable to switch between a first number of poles and a second number of poles;
- and
- a rotor rotatable within the stator, the rotor including a first group of magnetic flux barriers being without permanent magnet material and a second group of magnetic flux barriers at least partially filled with a permanent magnet material.
A line-start electric motor comprising:
- a stator including a first winding defining a first set of poles and a second winding defining as second set of poles;
- a rotor including a first group of magnetic flux barriers defining a first group of poles and a second group of magnetic flux barriers defining a second group of poles, the first group of magnetic flux barriers being without permanent magnet material and the second group of magnetic flux barriers at least partially filled with permanent magnet material;
- and
- a controller for switching between the first winding to synchronize rotation with the first group of poles on the rotor and provide a first rotational speed and the second winding to synchronize with the second group of poles on the rotor to provide a second rotational speed.
A method of operating a line-start electric motor comprising:
- selecting a first set of poles on a stator to generate a first rotating magnetic field with a controller, wherein the stator includes a first set of windings defining the first set of poles and a second set of windings defining a second set of poles;
- generating a reluctance torque in a first group of magnetic flux barriers without permanent magnet material disposed on a rotor to rotate the rotor at a first rotational speed;
- switching from the first winding to the second winding of the stator with the controller to stop the first rotating magnetic field and generate a second rotating field in the stator;
- and
- generating a permanent magnet torque in a second group of magnetic flux barriers including permanent magnet material on the rotor to rotate the rotor at a second rotational speed.
Dependencies are inferred from the claim text.