Compensation method of motor load pulsation based on nonlinear space vector pulse width modulation

A space vector pulse width and load pulsation technology, which is applied in the direction of controlling generators, vector control systems, and electromechanical brakes, etc., can solve the problem of limiting the application range and application field of PMSM, motor speed fluctuations, and torque/speed pulsation cannot be completely eliminated Motor design and production issues

Active Publication Date: 2013-05-15
HANGZHOU VANGO TECH
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AI Technical Summary

Problems solved by technology

Torque ripple will cause motor speed fluctuation and noise, which directly limits the application range and application field of PMSM
At present, there are two main ways to solve this problem: one is to improve the design of the motor body, such as

Method used

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  • Compensation method of motor load pulsation based on nonlinear space vector pulse width modulation
  • Compensation method of motor load pulsation based on nonlinear space vector pulse width modulation
  • Compensation method of motor load pulsation based on nonlinear space vector pulse width modulation

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Embodiment Construction

[0046] The motor load pulsation compensation method based on nonlinear space vector pulse width modulation proposed by the present invention, its flow chart is as follows image 3 shown, including the following steps:

[0047] (1) Decompose the current vector of the permanent magnet synchronous motor into the excitation current component i that generates the magnetic flux according to the field orientation coordinates d and torque-generating torque current component i q , and make the excitation current component i d and the torque current component i q Perpendicular to each other;

[0048] (2) Let the permanent magnet synchronous motor be A, B, C three-phase stator windings with an angle difference of 120°, and set the phase voltages of the three-phase stator windings to be U a , U b , U c , then there are:

[0049]

[0050] u s =U a +aU b +a 2 u c =U m sinωt-jU m cosωt=U m e -jωt

[0051] where U s is the composite vector of the three-phase stator voltag...

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Abstract

The invention relates to a compensation method of motor load pulsation based on nonlinear space vector pulse width modulation and belongs to the technical field of motor control. The method detects the motor running speed and variation of motor three-phase current in real time. Whether the motor load pulsation exceeds an index value is judged; if the motor load pulsation exceeds the index value, nonlinear feedback compensation load pulsation is conducted, adjacent vector action time in space vector pulse-width modulation (PWM) is adjusted, and the motor rotation speed fluctuation caused by the load pulsation is compensated. If the load pulsation is within an allowed range, compensation is not needed, and motor control is conducted according to a traditional space vector pulse-width modulation mode. The compensation method of the motor load pulsation based on the nonlinear space vector pulse width modulation can effectively control pulsation generated by a motor under the condition that the load is carried, and the motor is enabled to run smoothly. The method can effectively suppress electromagnetic noise when a permanent magnet synchronous motor runs at high speed, and noise pollution to environment in the process of running of the motor is reduced. The working efficiency of the permanent magnet synchronous motor in the process of slow running is improved, and the application range of the motor is expanded.

Description

technical field [0001] The invention relates to a compensation method for motor load fluctuation based on nonlinear space vector pulse width modulation, which belongs to the technical field of motor control. Background technique [0002] Space Vector Pulse Width Modulation is (Space Vector Pulse Width Modulation, hereinafter referred to as SVPWM), mainly based on the ideal flux circle of the stator of the three-phase symmetrical motor stator when the three-phase symmetrical sine wave voltage is supplied as the reference standard, and the different switches of the three-phase inverter The mode is properly switched to form a pulse width modulation (hereinafter referred to as PWM) wave, and the actual flux vector formed is used to track its accurate flux circle. The traditional sinusoidal pulse width modulation (SPWM) method starts from the point of view of the power supply to generate a sine wave power supply with adjustable frequency and voltage, while the SVPWM method consid...

Claims

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Application Information

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IPC IPC(8): H02P21/05H02P27/08
Inventor 施立成高强张岳张春
Owner HANGZHOU VANGO TECH
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