Mining high-voltage explosion-proof variable-frequency variable-speed three-phase asynchronous motor

Abstract

The invention relates to a mining high-voltage explosion-proof variable-frequency variable-speed three-phase asynchronous motor, and relates to the technical field of motors. A motor base adopts a water cooling structure and is formed by assembling an inner water jacket and an outer water jacket and welding a front flange and a rear flange, wherein the inner water jacket is provided with a water retaining strip to form a baffling water path, and a front end cover and a rear end cover are provided with labyrinth annular water cooling channels and are communicated with the baffling water coolingchannels. Axial ventilation holes are uniformly distributed in a stator iron core. Welding ribs are uniformly distributed on a rotating shaft to form an axial ventilating duct and form an axial circulating duct together with the ventilation holes in the inner wall of the motor base and corresponding box iron outside the motor base. The motor can effectively control the temperature rise of a stator, a rotor, a winding and a rotating shaft supporting part, the cooling problem of a variable frequency motor during low-speed operation is solved, and the normal operation of the motor is reliably ensured. According to the optimized and reasonable matching of the stator and rotor slots, the performance parameter indexes meet or exceed the requirements of industrial standards, and the disclosed motor has the characteristics of small vibration and low noise.

Description

Technical field: [0001] The invention relates to the technical field of electric motors, in particular to a mine-used high-voltage explosion-proof three-phase asynchronous electric motor with frequency conversion and speed regulation. Background technique: [0002] At present, the two-speed motor drive system is generally used in the scraper conveyor of the coal mine underground working face in our country, and the start-up of the high-power motor is realized by switching the two-speed motor from low speed to high speed. However, due to the presence of large mechanical shocks and electrical shocks, failures to start, chain breaks and other accidents occur from time to time, and the safety is poor. And adopting this way to drive will use special two-winding two-speed motor as well as two cables and two-speed switch. The structure of the two-speed motor is complicated, the cost is high, the power supply system is equivalent to two motors, the low-speed switching is not easy t...

AI Technical Summary

Problems solved by technology

The structure of the two-speed motor is complex, the cost is high, the power supply system is equivalent to two motors, the low-speed switching is not easy to control effectively, there are many fault points, and the reliability is poor

Images