Analysis and Restraining of Electro-Magnetic Interference for Thyristor Based DC Motor Drives

Abstract

A high-power DC motor drive with low electromagnetic interference (EMI) is needed for the nondestructive testing (NDT) robot in the nuclear industry environment. This paper focuses on the test and analysis of EMI for thyristor based DC motor control system, which can work in four quadrants to drive the NDT robot. The experimental tests of EMI are conducted with different factors, such as position, power supply mode, inductance of the smoothing reactor, motor load, and so on. The methods to restrain the EMI are researched and applied in the system. The experiments demonstrate that EMI of the DC motor drive is lower compared with the motor drive using PWM mode, and the drive can fully meet the need of the NDT robot.