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Three-phase four-switch direct current brushless motor space voltage vector control circuit and method

A brushless DC motor and space voltage vector technology, which is applied in the direction of DC motor speed/torque control, vector control system, motor generator control, etc., can solve the problem of large torque ripple and achieve voltage regulation and frequency conversion Speed, good torque ripple effect

Pending Publication Date: 2022-07-29
SHAANXI UNIV OF SCI & TECH
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a control circuit and method of a three-phase four-switch DC brushless motor space voltage vector, aiming at the problem of large torque ripple in the DC brushless motor control using four-switch control, based on eight vectors can be Better Torque Ripple Reduction in Four-Switch Brushless DC Motors

Method used

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  • Three-phase four-switch direct current brushless motor space voltage vector control circuit and method

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Embodiment Construction

[0015] The present invention will be described in further detail below in conjunction with the accompanying drawings,

[0016] figure 1 As shown, the control circuit of the three-phase four-switch DC brushless motor space voltage vector of the present invention specifically includes a DC bus part and an inverter part, wherein the inverter circuit of the inverter part is connected with the power supply and the A-phase, B-phase of the motor. The phase load is connected, and the C phase of the motor is connected to the capacitor C 1 , C 2 The neutral point E is connected.

[0017] First, before the starting process, it is stipulated that the counterclockwise rotation is forward rotation, and the motor runs in the forward rotation state.

[0018] like figure 2 As shown, an α-β coordinate system is established.

[0019] Assume that the A-phase voltage vector is in the 90° direction of the α-β coordinate system, the B-phase voltage vector is in the -150° direction, and the C-p...

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Abstract

The invention discloses a three-phase four-switch direct-current brushless motor space voltage vector control circuit and method.The control circuit comprises an inverter circuit, a direct-current bus circuit and a three-phase direct-current brushless motor, the inverter circuit comprises four insulated gate bipolar transistors, the direct-current bus circuit comprises two capacitors, and the three-phase direct-current brushless motor is connected with the three-phase four-switch direct-current brushless motor. The inverter circuit is respectively connected with a power supply and a load, an output end of the direct-current power supply is connected with the direct-current bus circuit, an output end of the inverter circuit is connected with two phases of the three-phase direct-current brushless motor, and a neutral point of a capacitor in the direct-current bus circuit is connected with a third phase of the motor. For inverter output, only four-switch variable frequency speed regulation is needed, the number of used main switch devices is one third smaller than that of a traditional variable frequency circuit, voltage regulation and variable frequency speed regulation are achieved at the same time, and torque pulsation of the motor can be well restrained.

Description

technical field [0001] The invention belongs to the technical field of AC-DC-AC frequency converters, and relates to a three-phase four-switch DC brushless motor space voltage vector control circuit and method. Background technique [0002] DC motors have good speed regulation characteristics, simple control characteristics, and excellent dynamic characteristics, so they are widely used in various drive devices and servo systems. However, DC motors employ brushes and commutators, which hinder their development. With the rapid development of electronic technology, power component technology and high-performance magnetic material manufacturing technology, brushless DC motors use electronic commutators to replace mechanical brushes and mechanical commutators. This kind of motor not only retains the advantages of DC motor, but also has the advantages of simple structure, reliable operation and convenient maintenance of AC motor. As soon as the DC brushless motor appeared, it de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/10H02P7/00H02P21/18
CPCH02P6/10H02P7/00H02P21/18
Inventor 谢仕宏杨智浩高鑫梁力梁荣茂
Owner SHAANXI UNIV OF SCI & TECH
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