A direct torque control method for ultra-high-speed permanent magnet synchronous motor based on core loss

Abstract

The invention provides an iron core loss-based direct torque control method for an ultra-high-speed permanent magnet synchronous motor. The invention discloses an iron core loss-based mathematical modeling method for the ultra-high-speed permanent magnet synchronous motor; a voltage equation, a flux linkage equation and a torque equation are adopted in motor rotary speed control by adopting the direct torque control method, wherein the flux linkage value is obtained by three-phase current calculation through a finite element analysis method; and iron core loss is taken into consideration in the voltage equation, and the iron core loss is converted into equivalent resistance. The method disclosed in the invention can be applied to the ultra-high-speed permanent magnet synchronous motor control system based on sensor-less rotary speed estimation; and angular error caused by iron core loss in the sensor-less rotary speed estimation can be effectively lowered.

Description

Technical field [0001] The invention belongs to the technical field of ultra-high-speed motor control, in particular to a direct torque control method of an ultra-high-speed permanent magnet synchronous motor based on core loss Background technique [0002] Ultra-high-speed permanent magnet synchronous motors have the advantages of light weight, small size, high power density, high reliability, and good dynamic response performance. The application prospects in many fields such as industrial manufacturing, aerospace, energy, medical and defense industries are growing broad. The development of its related technology is adapted to the development trend of contemporary ultra-high-speed and ultra-precision industrial processing technology, and promotes the rapid development of modern industry and science and technology. The related technology of ultra-high-speed permanent magnet synchronous motors has become a current research hotspot. [0003] When the ultra-high-speed permanent magn...

AI Technical Summary

Problems solved by technology

[0004] However, there are challenging issues in high-speed motor technology: such as the need for a robust mechanical structure, material requirements such as low-loss silicon steel and high tensile strength, and control issues such as pulse width modulation (PWM) delay, pulse width Modulation Distortion and Iron Loss

Since the iron loss is not considered in the traditional sensorless method, its estimated angular velocity error grows steadily as the velocity increases

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