Variable flux memory motor multi-step magnetic adjustment control method by considering uncontrollable power generation faults

Abstract

The invention discloses a variable flux memory motor multi-step flux modulation control method by considering an uncontrollable power generation fault. When the control method is applied, a variable flux memory motor operates in n different magnetization states. A critical maximum rotating speed corresponding to each magnetization state can be obtained according to the steady-state model of the motor when an uncontrollable power generation fault occurs. A whole motor rotating speed range is divided into n parts, for each target rotating speed, the rotating speed interval where the target rotating speed is located is judged, and the magnetization state of the motor is adjusted to the corresponding target magnetization state. The segmented control method disclosed by the invention can solvethe overvoltage problem under an uncontrollable power generation fault, and meanwhile, flux weakening speed expansion of the motor is realized.

Description

[0001] Field [0002] The invention relates to a multi-step magnetic adjustment control method for a variable magnetic flux memory motor, which belongs to the field of permanent magnet motor control. Background technique [0003] Permanent Magnet Synchronous Machine (PMSM) has the advantages of high torque density and high efficiency at low speed. However, since the magnetomotive force of the permanent magnet cannot be adjusted, it limits the maximum speed of the motor. In order to further expand the operating range of the motor, it is usually necessary to apply a direct-axis current for field weakening, and the extra current excitation leads to an increase in the loss of the motor at high speed. On the other hand, when the motor is running at high speed in the field-weakening area, if a field-weakening failure occurs, that is, no negative direct-axis current is applied to the motor winding, the motor will work in the state of Uncontrolled Generator Fault (UCGF) , the genera...

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Problems solved by technology

However, since the magnetomotive force of the permanent magnet cannot be adjusted, it limits the maximum speed of the motor

In order to further expand the operating range of the motor, it is usually necessary to apply a direct-axis current for field weakening, and the additional current excitation leads to an increase in the loss of the motor at high speed

On the other hand, when the motor is running at high speed in the field-weakening area, if a field-weakening failure occurs, that is, no negative direct-axis current is applied to the motor winding, the motor will work in the state of Uncontrolled Generator Fault (UCGF) , the generated voltage may reach several times the rated voltage of the motor, and the excessive voltage and the generated current will cause damage to the motor and its drive system

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