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The series explosion-proof variable frequency speed regulation three-phase asynchronous motor is suitable for electric traction in coal mines (non mining working faces) and workplaces containing explosive gas mixtures in factories. The motor is matched with a frequency conversion device, and has the advantages of good speed regulation performance, energy saving, large temperature rise margin, long service life, good performance, low noise, advanced explosion-proof structure, high reliability, and convenient use and maintenance. By changing the frequency, the speed regulation range of the motor is wide. Under the condition of open-loop U/f control, the speed regulation range is 3-50Hz constant torque speed regulation, and 50-100Hz constant power speed regulation. Under vector control conditions, the speed regulation range can also be expanded, with strong overload capacity, and can withstand 160% overload of the rated torque for 1 minute.