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Method and device for calculating weak magnetic speed expansion capability of permanent magnet synchronous motor

A technology of permanent magnet synchronous motor and calculation method, which is applied in the direction of calculation, electrical digital data processing, instrument, etc., can solve the problems of large influence on the overall performance of the motor, low work efficiency, long cycle, etc., so as to shorten the construction period and improve the calculation The effect of speed and high work efficiency

Active Publication Date: 2019-07-05
GUANGDONG UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the development of high-performance permanent magnet materials, the performance of permanent magnet motors has been greatly improved, especially permanent magnet synchronous motors, which have gradually developed towards high speed, high torque and high power density. Among them, permanent magnet synchronous motors The field-weakening speed expansion capability of the motor has a great influence on the overall performance of the motor, so it is necessary to calculate its field-weakening speed expansion ability when designing a permanent magnet synchronous motor. In the prior art, when calculating the field-weakening speed expansion capability of a permanent magnet synchronous motor Usually, it is necessary to build a complex permanent magnet synchronous motor control system analysis model or prototype for testing and calculation. The cycle of building physical equipment is longer, which reduces the calculation speed of the permanent magnet synchronous motor's magnetic field weakening and speed expansion capability, and the work efficiency is low.

Method used

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  • Method and device for calculating weak magnetic speed expansion capability of permanent magnet synchronous motor
  • Method and device for calculating weak magnetic speed expansion capability of permanent magnet synchronous motor
  • Method and device for calculating weak magnetic speed expansion capability of permanent magnet synchronous motor

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Experimental program
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specific Embodiment approach

[0116] First, the transient field model of the permanent magnet synchronous motor is established in the finite element simulation software ANSYS Maxwell, and the phase current effective value I 1 , the current control angle β and the speed n parameters are variables of the three-phase excitation current source model, that is

[0117]

[0118] Where, ω=2πf, f=np / 60, p=4.

[0119] Then, let the effective value of the phase current I 1 =I lim =21A; the value range and simulation step size of the current control angle β are 0°~90° and 10° respectively; 600rpm, (3100-4000)rpm step size is 100rpm; align the d-axis of the rotor with the a-phase axis; after the setting is completed, the simulation calculation can be carried out.

[0120] Then, after the above-mentioned simulation calculation is completed, the following output variables are established in the post-processing system of ANSYS Maxwell:

[0121]

[0122] In the above, θ=pωt.

[0123] Then, the following output v...

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Abstract

The invention discloses a method and device for calculating the weak magnetic speed expansion capability of a permanent magnet synchronous motor, and the method comprises the steps of building a transient field simulation model of the permanent magnet synchronous motor, and setting a three-phase excitation current source in the transient field simulation model; determining an optimal current control angle corresponding to the maximum electromagnetic torque according to a calculation formula of the electromagnetic torque; determining the base speed of the permanent magnet synchronous motor according to a calculation formula of the effective value of the phase voltage, and determining a current control angle corresponding to each rotating speed exceeding the base speed by taking the effective value of the limit phase voltage as a constraint condition; and obtaining the highest rotating speed of the permanent magnet synchronous motor according to the current control angle corresponding toeach rotating speed exceeding the base speed and the corresponding relation, so that a user can determine the weak magnetic speed expansion capability of the permanent magnet synchronous motor according to the ratio of the highest rotating speed to the base speed. Due to the fact that the transient field simulation model is a virtual model built in a software, the building speed of the transientfield simulation model is shorter, the calculation speed of the weak magnetic speed expansion capability of the permanent magnet synchronous motor is increased, and the working efficiency is higher.

Description

technical field [0001] The invention relates to the field of permanent magnet synchronous motors, in particular to a method for calculating the field-weakening speed expansion capability of the permanent magnet synchronous motor, and also relates to a calculation device for the field-weakening speed expansion capability of the permanent magnet synchronous motor. Background technique [0002] With the development of high-performance permanent magnet materials, the performance of permanent magnet motors has been greatly improved, especially permanent magnet synchronous motors, which have gradually developed towards high speed, high torque and high power density. Among them, permanent magnet synchronous motors The field-weakening speed-expanding capability of the permanent magnet synchronous motor has a great influence on the overall performance of the motor, so it is necessary to calculate its field-weakening speed-expanding ability when designing the permanent magnet synchrono...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/39G06F30/23
Inventor 阮博谷爱昱刘海
Owner GUANGDONG UNIV OF TECH
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