A Vector Stepless Field Weakening Method for Permanent Magnet Synchronous Motor

A permanent magnet synchronous motor and vector technology, applied in the electromagnetic field, can solve the problems of unable to fully utilize the characteristics of permanent magnet synchronous motors, small torque loss, large torque loss, etc., and achieve fast and stable dynamic response, small torque loss, and fast dynamic response Effect

Active Publication Date: 2022-01-18
ZHEJIANG LEAPMOTOR TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 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 vector stepless field weakening method for the permanent magnet synchronous motor. The present invention fully utilizes the characteristics of the permanent magnet synchronous motor and has strong robustness , easy to operate
[0007] At the same time, the present invention also solves the problems of large torque loss and easy loss of control in the prior art, and can ensure that the motor runs stably in a deep magnetically weak area, with fast dynamic response, strong robustness, and small torque loss

Method used

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  • A Vector Stepless Field Weakening Method for Permanent Magnet Synchronous Motor
  • A Vector Stepless Field Weakening Method for Permanent Magnet Synchronous Motor
  • A Vector Stepless Field Weakening Method for Permanent Magnet Synchronous Motor

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Embodiment 1

[0056] This embodiment provides a vector stepless field weakening method for permanent magnet synchronous motors, specifically as figure 1 shown, including the following steps:

[0057] S1: The voltage closed-loop module adjusts the required dynamic compensation according to the required voltage utilization;

[0058]S2: After compensation, the speed input current look-up module performs a look-up table to obtain the required current point;

[0059] S3: The required current point obtained by looking up the table passes through the current regulator to obtain an output;

[0060] S4: The required current point obtained by looking up the table is calculated through the voltage feedforward unit to calculate the voltage feedforward compensation amount;

[0061] S5: The output of the current regulator and the voltage feed-forward compensation constitute the final wave voltage.

Embodiment 2

[0063] This embodiment provides a vector stepless field weakening method for permanent magnet synchronous motors, such as Figure 2-6 The following steps are shown:

[0064] S1: The voltage closed-loop module adjusts the required dynamic compensation amount according to the required voltage utilization rate.

[0065] Wherein, S1 includes the following steps:

[0066] S11: The voltage closed-loop module sets the current bus voltage U according to the required voltage utilization dc ;

[0067] S12: put U d * and U q * Calculate the arithmetic square root and set the current bus voltage U dc perform linear operations;

[0068] S13: Perform PI calculation on the linear calculation result to obtain the rotational speed compensation amount ΔSpd;

[0069] S14: ΔSpd and the current speed Spd accumulate the output speed Spdreal;

[0070] Among them, U d * and U q * is the output of the current regulator.

[0071] S2: After compensation, the speed input current look-up module...

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Abstract

The invention discloses a vector stepless magnetic field weakening method for permanent magnet synchronous motors, which cannot fully utilize the characteristics of permanent magnet synchronous motors. The invention expands the high-speed strategy, improves the stability of deep magnetic field weakening, and reduces the torque in dynamic adjustment Loss, use the current after the compensation voltage look-up table to carry out the voltage feedforward module, with the increase of the speed, the stability of the system increases, and the dynamic response can be fast and stable at high-speed magnetic field weakening, and the torque loss is very small, avoiding the loss of torque Loss, give full play to the characteristics of the permanent magnet synchronous motor, ensure the stable operation of the motor in the deep field weakening area, fast dynamic response, strong robustness, simple and easy to operate.

Description

technical field [0001] The invention relates to the field of electromagnetic technology, in particular to a vector stepless field weakening method capable of improving the existing field weakening strategy, expanding high-speed power, improving the stability of deep field weakening and reducing the permanent magnet synchronous motor in dynamic adjustment. Background technique [0002] With the development of the national economy and science and technology, motors play an increasingly important role in all walks of life. 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 differe...

Claims

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Application Information

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