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US 10,916,997 B2Granted
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.
Claims14
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 that define eight poles with each of the eight poles including two slots in the rotor being without permanent magnet material, a second group of magnetic flux barriers that define four poles including parts of four slots that are at least partially filled with a permanent magnet material and at least four groups of rotor slots that include cage windings disposed between at least two of the eight poles of the first group of magnetic flux barriers, wherein each of the four groups of rotor slots are disposed between at least two of the eight poles of the first group of magnetic flux barriers.
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 eight poles, a second group of magnetic flux barriers defining a second group of four poles and at least four groups of rotor slots that include cage winding disposed between two of the eight poles of the first group of magnetic flux barriers, the first group of magnetic flux barriers including at least two slots for each of the eight poles being without permanent magnet material and the second group of magnetic flux barriers including parts of at least four slots at least partially filled with permanent magnet material, wherein each of the at least four groups of rotor slots are disposed between at least two of the eight poles of the first group of magnetic flux barriers;
- and
- a controller configured to switch 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.
1 more element
Dependencies are inferred from the claim text.