Application of Zero-voltage Switching Technique in Three-phase Inverter of PMSM

Abstract

Three-phase Inverters are widely used in motor drive systems among which industrial motors are the majority such as water pumps and cooling fans These types of motors usually work for long period of time carrying steady loads and consume significant amount of electricity The traditional inverter topology operates in hard-switching mode which leads to a lot of switching loss and electromagnetic interference In order to eliminate the flaw of the traditional inverter this paper proposes a zero-voltage switching (ZVS) technique and applies it to a permanent magnet synchronous motor (PMSM) driver The proposed inverter topology adds one auxiliary commutation circuit and combined with the five-segment alternating carrier SVPWM to create ZVS timings Furthermore this paper provides analysis for the working principle of the zero-voltage switching inverter and explain the design consideration of its resonant components Finally experimental results were presented to show that the proposed ZVS inverter can reduce the switching loss in specific steady-state operating load range Compared with the conventional inverter the proposed ZVS inverter can improve the efficiency of the motor driver by 3% and also reduce the voltage change slope and temperature of the power switches

Date of Award	2020
Original language	English
Supervisor	Mi-Ching Tsai (Supervisor)