Abstract: On basis of analysis of principle of control mode of frequency converter, experiment platform of control mode was established by use of Drivewizard to monitor output current and frequency of the frequency converter, torque and speed of motor, so as to compare speed-regulation performance of V/f mode and VC mode, and to get specific function index of the two control modes. The test results show that frequency-conversion speed-regulation system based on VC mode can significantly improve load capacity of the shearer in low frequency range.