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Permanent magnet synchronous instability-preventing weak magnetic method

A permanent magnet synchronous, loss-proof technology, applied in the direction of motor generator control, control of electromechanical transmission, control of electromechanical brakes, etc., can solve the problem that permanent magnet synchronous motor cannot be fully utilized, and achieve fast and stable dynamic response and small torque loss. Effect

Active Publication Date: 2020-12-18
ZHEJIANG LEAPMOTOR TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims to overcome the problem that the characteristics of the permanent magnet synchronous motor cannot be fully utilized in the prior art, and provides a permanent magnet synchronous anti-instability magnetic field weakening method that can fully utilize the characteristics of the permanent magnet synchronous motor

Method used

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  • Permanent magnet synchronous instability-preventing weak magnetic method
  • Permanent magnet synchronous instability-preventing weak magnetic method
  • Permanent magnet synchronous instability-preventing weak magnetic method

Examples

Experimental program
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Embodiment

[0042] Embodiment: a permanent magnet synchronous anti-instability magnetic field weakening method, such as figure 1 As shown, the method includes the following steps:

[0043]S1: Set the voltage utilization rate Kr, design the voltage loop, and calculate the look-up coefficient k; the specific steps are:

[0044] Set the voltage utilization rate Kr, design the voltage loop, and calculate the look-up table modulation coefficient k, such as figure 2 As shown, the calculation formula is as follows:

[0045] Perform PI adjustment on K1 to obtain the table look-up modulation coefficient k;

[0046] In the formula: U d* , U q* are the outputs of the current regulators of the D-axis and Q-axis respectively, and kr represents the voltage utilization ratio; U dc Indicates the bus voltage, Spd indicates the motor speed, and Tor indicates the motor torque command.

[0047] S2: according to motor speed spd, bus voltage U dc , the rated voltage Uk and the look-up table modulatio...

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Abstract

The invention discloses a permanent magnet synchronous instability-preventing weak magnetic method. The method comprises the following steps of S1 setting Udc according to a required voltage utilization rate, designing a voltage loop, and calculating a table look-up coefficient k; S2 calculating according to the motor rotating speed, the bus voltage, the rated voltage Uk and the table look-up modulation coefficient k to obtain a final actual table look-up rotating speed; S3 calibrating and storing a weak magnetic current point, and calculating (id, iq) according to the modulation coefficient k, the bus voltage Udc, the motor rotating speed Spd and the torque request Tor; S4 calculating real-time flux linkages psi d and psi q by the voltage feed-forward unit according to the calculated reference current id and iq in combination with a flux linkage parameter table calibrated in advance, and then sending the real-time flux linkages psi d and psi q to the feed-forward voltage calculation unit to calculate feed-forward voltage compensation amounts UdC and UqC; and S5 enabling a current regulator to adopt a PI controller, using the compensated current as reference input, and outputting reference voltage through regulation of the current regulator. The invention provides the permanent magnet synchronous instability-preventing weak magnetic method which can give full play to the characteristics of a permanent magnet synchronous motor.

Description

technical field [0001] The invention relates to the technical field of permanent magnet destabilization prevention, in particular to a permanent magnet synchronous destabilization prevention and weakening method. Background technique [0002] At present, with the development of the national economy and science and technology, the role played by motors in all walks of life is becoming more and more important. Due to its many advantages in design, manufacture and control, permanent magnet synchronous motors are widely used in various industrial production and life occasions. In addition, my country is rich in rare earth resources, and the application market of permanent magnet synchronous motors is particularly large in my country. Permanent magnet synchronous motors can be divided into surface mount type and built-in type according to the similarities and differences of AC-D axis inductance. Because the built-in permanent magnet synchronous motor (IPMSM) can have a wide spee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P21/14H02P21/22H02P25/022
CPCH02P21/0003H02P21/0089H02P21/14H02P21/22H02P25/022H02P2207/05
Inventor 刘灿非凡
Owner ZHEJIANG LEAPMOTOR TECH CO LTD
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