Rotor assembly for an electric motor comprising
A rotor and component technology, applied in the field of electric motors, can solve problems such as rotor NVH
Inactive Publication Date: 2020-05-01
ATIEVA USA INC
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Problems solved by technology
Although the average cogging torque in the motor is zero due to the pole polarity being reversed, as the edge of each pole passes between the stator teeth, the torque oscillates between positive and negative causing NVH problems in the rotor
These vibrations, in turn, can adversely affect motors, bearings and associated transmission equipment
This is especially problematic if the differential is mounted within the rotor shaft
Method used
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[0019] As used herein, the singular forms (a, an) and "the" are intended to include the plural forms as well, and unless the context clearly indicates otherwise, the terms "comprises", "comprises", "comprises" and / or or "comprising" specifies the presence of stated features, integers, steps, operations, elements and / or parts, but does not exclude the presence of one or more other features, integers, steps, operations, elements, parts and / or groups thereof exist or add. As used herein, the term "and / or" and the symbol " / " are meant to include any and all combinations of one or more of the associated listed items. Also, although the terms first, second, etc. may be used herein to describe various steps or calculations, these steps or calculations should not be limited by these terms, but rather these terms are only used to distinguish one step or calculation from another open. For example, a first calculation could be termed a second calculation; similarly, a first step could ...
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The present invention provides a rotor assembly for an electric motor comprising: (i) a rotor; (ii) a lamination stack formed of a plurality of lamination layers, where the lamination stack is stackedalong the longitudinal axis of the rotor; (iii) a first plurality of cavities within the lamination stack, where a first plurality of permanent magnets are contained within the first plurality of cavities, where the first plurality of permanent magnets are configured as a first plurality of magnet pairs, and where each magnet pair is arranged in a first V-shaped configuration; and (iv) a second plurality of cavities within the lamination stack, where a second plurality of permanent magnets are contained within the second plurality of cavities, where each permanent magnet of the second plurality of permanent magnets is larger than each permanent magnet of the first plurality of permanent magnets, where the second plurality of permanent magnets are configured as a second plurality of magnetpairs, and where each magnet pair is arranged in a second V-shaped configuration.
Description
technical field [0001] The present invention relates generally to electric motors and, in particular, to low cogging torque, high torque density traction motors and, more particularly, to an apparatus for reducing cogging torque in permanent magnet electric motors. Background technique [0002] The auto industry is slowly beginning to meet the demands of ultra-low-emission, high-efficiency vehicles in response to the demands of consumers driven by the dual drive of rising fuel prices and the dire consequences of global warming. While some in the industry are trying to achieve these goals by designing more efficient internal combustion engines, others are integrating hybrid or all-electric drivetrains into their vehicle ranges. However, to meet consumer expectations, the automotive industry must not only achieve greener drivetrains, but must also maintain reasonable levels of performance, range, reliability, safety and cost. [0003] The most common way to achieve low-emissi...
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IPC IPC(8): H02K1/27
CPCH02K1/274H02K2213/03H02K1/2766H02K2201/06H02K1/276H02K1/28H02K21/14
Inventor E.德拉拉
Owner ATIEVA USA INC