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Brushless direct-current motor stator flux linkage identification method

A brush DC motor and stator flux linkage technology, which is applied in the control of generators, motor generators, electronically commutated motors, etc., can solve the problems of large differences in identification effects and difficulty in meeting the requirements of motor control performance, and achieve motor The effect of fewer parameters, simple structure, and small amount of calculation

Active Publication Date: 2014-03-19
NANTONG HUAAN SUPER CRITICAL EXTRACTION
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the identification effect of the existing technology is quite different from the actual value, and the motor control performance is difficult to meet the requirements

Method used

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  • Brushless direct-current motor stator flux linkage identification method
  • Brushless direct-current motor stator flux linkage identification method
  • Brushless direct-current motor stator flux linkage identification method

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Embodiment Construction

[0019] combine figure 1 Describe the identification method of a kind of brushless DC motor stator flux linkage of the present invention, comprise the following steps:

[0020] Step 1: Ground the BLDC Motor Neutral

[0021] If the neutral point of the brushless DC motor is grounded, the voltage of the neutral point is clamped to 0.

[0022] Step 2: Determine the three-phase terminal voltage and phase voltage of brushless DC motor A, B, and C

[0023] The determination of the terminal voltage of the brushless DC motor can be considered separately during the normal conduction period of the three-phase full-bridge inverter and during the commutation period. Judging whether the off-phase current is 0: When the off-phase current is 0, it indicates that the three-phase full-bridge inverter is in the normal conduction period; when the off-phase current is not 0, it indicates that the three-phase full-bridge inverter is on During commutation;

[0024] During the normal conduction o...

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Abstract

The invention discloses a brushless direct-current motor stator flux linkage identification method. The method comprises the following steps: the neutral point of a brushless direct-current motor is grounded to make the voltage of the neutral point clamped to zero; the brushless direct-current motor end voltage is determined through the on-off state of a power tube and a fly-wheel diode during the normal conduction process and the commutation process of a three-phase full-bridge inverter, wherein a three-phase phase voltage is obtained by performing subtraction between the three-phase end voltage and the neutral point voltage; detection is performed by adopting a current sensor to obtain a three-phase phase current, and calculation is performed according to the voltage model of the stator flux linkage to obtain a three-phase stator flux linkage; the three-phase stator flux linkage is filtered by a high-pass filter through CLARK transformation; and vector synthesis is performed on the three-phase stator flux linkage filtered by the high-pass filter to obtain a brushless direct-current motor stator flux linkage. According to the invention, advantages of less required motor parameters, simple structure, less calculation amount and low hardware cost can be realized.

Description

technical field [0001] The invention relates to a brushless direct current motor, in particular to an identification method for the stator flux linkage of the brushless direct current motor. Background technique [0002] Brushless DC motors have many advantages such as simple structure, high power density, and simple control. In recent years, brushless DC motors have been increasingly widely used in industrial fields such as high-performance speed regulation systems and servo control systems. [0003] In the direct torque control of brushless DC motor, the identification of stator flux linkage has an important influence on the stable operation of the motor. If the identification of the stator flux linkage is inaccurate, it will lead to the saturation of the air gap magnetic field of the brushless DC motor, the distortion of the stator current waveform, and the abnormal torque output. In severe cases, the brushless DC motor will not operate normally. At present, the known p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14
Inventor 张懿魏海峰冯友兵李泰
Owner NANTONG HUAAN SUPER CRITICAL EXTRACTION
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