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Electric vehicle permanent magnet synchronous motor demagnetization on-line detection method

A technology of permanent magnet synchronous motor and electric vehicle, which is applied in the direction of motor generator control, electronic commutation motor control, and control generator, etc., can solve the problems such as being unsuitable for online detection, large amount of calculation, and ignoring the effect of permanent magnet temperature.

Inactive Publication Date: 2017-10-24
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] To sum up, the above demagnetization detection methods do not consider the influence of the permanent magnet temperature or have a large amount of calculation and are not suitable for on-line detection.

Method used

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  • Electric vehicle permanent magnet synchronous motor demagnetization on-line detection method
  • Electric vehicle permanent magnet synchronous motor demagnetization on-line detection method
  • Electric vehicle permanent magnet synchronous motor demagnetization on-line detection method

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Embodiment Construction

[0065] Embodiments of the present invention are described below in conjunction with the accompanying drawings, but the present invention is not limited thereto.

[0066] The invention conducts on-line measurement of the permanent magnet flux linkage of the permanent magnet synchronous motor through the three-phase active short circuit.

[0067] Such as figure 1 As shown, the vehicle control unit 1 is used to actively short-circuit the control unit 1 according to the working mode of the vehicle under the condition that the motor does not need to work on the active output torque, such as the working conditions such as independent driving of the engine, engine idling and engine braking. 2. Issue an active short-circuit control command.

[0068] The active short-circuit control unit 2 judges whether to implement the active short-circuit control according to the active short-circuit control command issued by the vehicle control unit 1 and the speed signal output by the position an...

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Abstract

The invention relates to an electric vehicle permanent magnet synchronous motor demagnetization on-line detection method. The method is characterized in that an entire vehicle control unit is configured to send an active short-circuit control instruction to an active short-circuit control unit according to the entire vehicle operation mode; the active short-circuit control unit determines whether the active short-circuit control needs to be implemented according to the active short-circuit control instruction sent by the entire vehicle control unit and the rotational speed signal output by a position and rotation speed processing unit, when the active short-circuit control instruction output by the entire vehicle control unit is 1 and the motor mechanical speed exceeds the turning point speed omega g, in the case of the two conditions are met, the active short-circuit PWM signal is output to an inversion switching circuit, if the conditions are not met, the active short-circuit PWM signal is not output. The electric vehicle permanent magnet synchronous motor demagnetization on-line detection method considers the influence of temperature (particularly under the high temperature) to permanent magnet synchronous motor demagnetization, and can monitor the healthy state of the permanent magnet online through active short-circuit current measurement, thereby improving the detection accuracy.

Description

technical field [0001] The invention relates to an on-line detection method for demagnetization of a permanent magnet synchronous motor used in an electric vehicle, belonging to the technical field of motor drive control. Background technique [0002] In general, new energy vehicles are driven by multiple power sources. The power sources include motors and engines. The motors can be driven simultaneously with the engine or independently to complete various vehicle working modes. The operating environment temperature range of permanent magnet synchronous motors for electric vehicles is between -40°C and 150°C. Due to long-term operation, the temperature rise of the rotor will exceed the allowable threshold, resulting in permanent demagnetization. In addition, high-speed operation requires field-weakening control. The magnetic field generated by the field-weakening current offsets part of the magnetic field of the permanent magnet itself, reducing the flux linkage of the synth...

Claims

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Application Information

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IPC IPC(8): H02P21/14H02P21/06
CPCH02P21/141H02P21/06
Inventor 文彦东刘志强郭璐璐张颖暴杰胡晶赵慧超王飞李帅胡波黄智昊刘晓录刘金峰
Owner CHINA FIRST AUTOMOBILE
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