Two-phase eight-vector direct torque control method for three-phase motor control circuit

CN115913042BActive Publication Date: 2026-07-24SHAANXI UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHAANXI UNIV OF SCI & TECH
Filing Date
2022-11-18
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing three-phase four-switch inverters have problems with large torque ripple and low load capacity in motor speed regulation. Especially in high-power units, traditional control methods result in unsmooth voltage vector switching and a sharp reduction in motor output torque.

Method used

A two-phase eight-vector direct torque control method is adopted. By defining a new voltage space vector and sector division, the circuit conduction process is optimized. Combined with the hysteresis adjustment unit, an appropriate switching signal is selected for control, forming a symmetrical three-phase waveform to drive the motor.

Benefits of technology

It effectively reduces the use of main switching devices, lowers component losses, improves the torque smoothness and load-carrying capacity of the motor, and enhances speed regulation performance.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a two-phase eight-vector direct torque control method of a three-phase motor control circuit, which is based on two-phase eight-vectors of the three-phase motor control circuit, voltage vectors are used to divide a complex plane to form multiple sectors zone The electric angles of each sector are different, the flux linkage adjustment instruction and the torque adjustment instruction obtained through a hysteresis adjustment unit, and the sector where the current flux linkage is located are used to set a voltage vector selection table, and appropriate switching signals are selected to control an inverter. Compared with other four-switch three-phase asynchronous motor control methods, the application adopts eight-vector direct torques to control eight vectors, and two additional eight-vector direct torques can well suppress the torque ripple of the motor.
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