Methods and apparatus for a permanent magnet machine with an added air barrier

A permanent magnet motor and rotor technology, applied to synchronous motors with stationary armatures and rotating magnets, motors, transportation and packaging, etc., can solve the problems of increasing manufacturing complexity and cost, reducing motor torque, etc.
CN101741199AInactive Publication Date: 2010-06-16GM GLOBAL TECH OPERATIONS LLC
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
GM GLOBAL TECH OPERATIONS LLC
Publication Date
2010-06-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

An internal permanent magnet machine (''IPM machine'') of the type used, for example, with traction motors and hybrid electric vehicles, includes a rotor with an additional air barrier provided above the first magnet barrier in the same rotor slot. Each magnet only fills a portion of each cavity, thereby defining the air barriers. The added air barrier above the permanent magnet of the first layer acts as a barrier to the first layer magnet and lowers the magnet flux.
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Description

[0001] cross reference

[0002] This application claims priority to US Provisional Patent Application No. 60 / 991,310, filed November 30, 2007. technical field

[0003] The present invention relates generally to magnetic devices such as electric machines, and in particular to interior permanent magnet electric machines. Background technique

[0004] Interior Permanent Magnet (IPM) motors are advantageous for the operation of fuel cell and hybrid electric vehicles due to their desirable characteristics—namely, good torque density, good overall efficiency , good constant power range, etc. The permanent magnet motor relies on its structure to obtain the rotor magnetic field in this permanent magnet motor, which is different from other motors, such as induction motors, switched reluctance motors or synchronous reluctance motors, in which it is supplied by the power supply stator current to generate a magnetic field. Therefore, permanent magnet motors exhibit superior efficienc...

Claims

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