Power Electronic Noise Suppression Technology For Multi-module Motor

In recent years,electrification has been rapidly developed in the transportation fields such as ships,automobiles,and rail transportation.Transportation electrification has greatly reshaped the development direction of the modern transportation system which has also brought a series of problems and challenges.As the country continues to pay more attention to advanced equipment manufacturing fields such as electric shipment-propulsion,electrical vehicles and electrified rail transportation,the in-depth performance optimization of the existing electric drive system has important scientific research and application value.As for the electrical machine,the voltage level in transportation electrification occasions severely limit the increase of the power level in motor system.Generally,multi-module windings can be used to reduce the current stress,which brings about the actual demand and optimization potentiality of multi-module motors.For the motor drive,power electronic devices have been widely used in motor drive systems,but the high-frequency switching characteristic of power electronic devices have brought more and more serious power electronic noises such as high-frequency vibration,acoustic noise,and electromagnetic interference(EMI).This topic takes two-module motor as example,takes multi-module motors and their drive systems as the research issue,and systematically compares the motor design schemes,modulation algorithms and vibration mechanisms of multi-module motors based on low power electronic noise.This article firstly analyzes the topological evolution process from the traditional threephase motor system to the multi-module motor system,which proposes the integrated circuit topology for the multi-module motor system with the carrier phase-shift modulation scheme.The carrier phase-shifting modulation scheme makes full use of the freedom in carrier coordination among modules,which effectively improves the electromagnetic performance of the multi-module motor system in the high-frequency band.At the same time,the above topology and the carrier phase-shift modulation algorithm also bring about problems such as the circulating current between the corresponding phase.This article will systematically analyze the winding structure and arrangement optimization of the multi-module motor based on the minimum magnetic-coupling to match the carrier phase-shift modulation algorithms,and verify the above conclusions through related simulations and experiments.On the basis of completing the optimized design of the multi-module motor,this article will further analyze the influence of the carrier phase-shift modulation scheme on the highfrequency phase current ripple,and start with the harmonic current to analyze the corresponding electromagnetic force distribution under the carrier phase-shift modulation algorithm.Meanwhile,from the electromagnetic force in tangential and radial directions,the influence of carrier-shift method related to its amplitude and spatial distribution is clarified,which provides theoretical support for optimizing system vibration performance.At the same time,the vibration analysis of the motor system is not only related to the frequency spectrum characteristics of the electromagnetic force,but also closely related to its force wave in spatial order and natural vibration mode.This article will also pay attention to the change of the electromagnetic force spatial order with carrier phase-shift method.On the basis of considering the specific vibration order and natural vibration mode,the relationship between carrier phase-shift and high frequency vibration is systematically analyzed.Finally,taking a dual-module motor as an example,the current ripple characteristics,electromagnetic force,and common mode noise of the motor system under the carrier phaseshift modulation algorithm are compared by experiments.The feasibility of multi-module motor system and the effectiveness of the novel modulation strategy in power electronic noise suppression.The different suppression mechanisms of the multi-module motor system applying the carrier phase-shift modulation strategy in different types of power electronic noise are summarized,and the noise suppression technology for different applications is also proposed and verified by experiments.