Mine hoist widely used wound-rotor motor rotor series resistance speed adjustment mode, with poor speed performance, low control precision, cannot satisfy the needs of safe production. In order to improve the reliability of mine hoist and the performance of speed adjustment, speed sensorless vector control, energy feedback type high voltage inverter as core system AC drive system was adopted, the coal mine during hoist electric control system TKD technical was reformed. The results showed that the modified equipment had good speed regulation performance, with fast response speed, big low frequency torque, accurate control, smooth operation, excellent power saving effect, which was of great significance safe and economic operation of mine hoist.