1. Introduction

This experimental device can provide excitation voltage and armature voltage for DC motor, and the armature voltage can be adjusted between DC 0 and 220V to realize speed control of DC motor. Through the experiment, and master the principle and control mode, the corresponding knowledge and skills, suits, higher vocational colleges, secondary vocational schools and vocational school related professional teaching and skills training examination.
2.The equipment contained the following components
1) Enable switch
2) Adjustment of soft start time.
3) Excitation voltage output terminal --DC 220V/0.5A.
4) Dual control switch -- power switch.
5) Current limit adjustment.
6) Potentiometer -- armature voltage adjustment.
7) Armature voltage output terminal --DC 0-220v /4A.
Insurance of 8.
9) Power socket --AC220V power supply.