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Method for detecting deterioration of permanent magnet in electric motor and system for the method

A technology of electric motors and permanent magnets, which is applied in the direction of single motor speed/torque control, measurement of magnetic variables, and magnetic measurement environment, and can solve problems such as motors that have not been developed

Inactive Publication Date: 2012-07-25
TOYOTA IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, electric motors that are installed in vehicles and repeat stop and start operations have not yet been developed

Method used

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  • Method for detecting deterioration of permanent magnet in electric motor and system for the method
  • Method for detecting deterioration of permanent magnet in electric motor and system for the method
  • Method for detecting deterioration of permanent magnet in electric motor and system for the method

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Embodiment Construction

[0023] The following will refer to Figure 1 to Figure 7 A method for detecting degradation of a permanent magnet of an electric motor and a system for the method according to a first preferred embodiment of the present invention will be described.

[0024] refer to figure 1 , the system for detecting the degradation of the permanent magnets in the electric motor is designated as a whole with reference numeral 1 and the electric motor with 8 , respectively. refer to image 3 , the motor 8 has a stator core 81 around which a three-phase coil serving as a multi-phase coil is wound, and a rotor 82 in which a permanent magnet 83 is incorporated. The system 1 is used to detect any degradation of the permanent magnets 83 of the electric motor 8 . The electric motor 8 is incorporated in an electric compressor for a vehicle air conditioner, and the system 1 is installed in a vehicle together with an electric compressor (not shown) for a vehicle air conditioner. For illustration pu...

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PUM

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Abstract

A method for detecting deterioration of a permanent magnet in an electric motor is characterized by peak current measuring steps and a determination step. In the first peak current measuring step, when the electric motor is started, a first pulsed voltage is applied to the multi-phase coils so as to generate magnetic flux directed in the same direction as generated by the permanent magnet and a first peak current is measured. In a second peak current measuring step, a second pulsed voltage is applied to the multi-phase coils so as to generate magnetic flux directed in the direction opposite to the direction in which magnetic flux is generated by the permanent magnet and a second peak current is measured. In a determination step, it is determined whether or not the permanent magnet is deteriorated based on the difference of the absolute value between the first and the second peak currents.

Description

technical field [0001] The present invention relates to a method for detecting degradation of a permanent magnet incorporated in an electric motor among electric compressors for vehicle air conditioning and a system for the same. Background technique [0002] An electric compressor in which an electric motor is incorporated has been used in a refrigeration cycle of a vehicle air conditioner. As a motor for this purpose, a compact but high-performance electric motor (internal permanent magnet (IPM) motor) having a rotor including permanent magnets is useful. Such a motor and a device for driving the motor are disclosed in Japanese Patent Application Publication No. 2004-7924 ​​and Japanese Patent Application Publication No. 2006-166574. [0003] In this type of motor, the properties of the permanent magnets in the rotor of the motor affect the overall properties of the motor. Therefore, it is important to prevent the degradation of any permanent magnet and to detect its occ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/12H02P6/06H02P6/08H02P6/16
CPCG01R33/1207G01R33/10G01R33/007
Inventor 深作博史名嶋一记
Owner TOYOTA IND CORP
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