Vector stepless flux weakening method of permanent magnet synchronous motor

A permanent magnet synchronous motor, vector technology, applied in the electromagnetic field, can solve the problems of small torque loss, easy to run out of control, unable to give full play to the characteristics of permanent magnet synchronous motor, etc.

Active Publication Date: 2020-10-20
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 magn

Method used

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  • Vector stepless flux weakening method of permanent magnet synchronous motor
  • Vector stepless flux weakening method of permanent magnet synchronous motor
  • Vector stepless flux weakening method of permanent magnet synchronous motor

Examples

Experimental program
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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 rate;

[0058]S2: The required speed compensation is input into the current look-up module to look up the 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, Y d * and U q * is the output of the current regulator.

[0071] S2: The required voltage compensation is input to the current ...

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Abstract

The invention discloses a vector stepless flux weakening method of a permanent magnet synchronous motor. A problem that characteristics of the permanent magnet synchronous motor cannot be fully exerted is solved. A high-speed strategy is expanded; the stability of deep weak magnetism is improved; the torque loss in dynamic adjustment is reduced; a voltage feedforward module is carried out by usingthe current after the compensation voltage table lookup; along with the increase of the rotating speed, the stability of the system is improved, quick, stable and dynamic response can be realized during high-speed flux weakening, the torque loss is small, the torque loss is avoided, the characteristics of the permanent magnet synchronous motor are brought into full play, and the motor is ensuredto stably operate in a deep flux weakening region, and the method is quick in dynamic response, high in 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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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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