Motor capable of realizing stator closed and rotor open ventilation mode by adopting axial-flow ventilation

Abstract

The invention discloses a motor capable of realizing a stator closed and rotor open ventilation mode by adopting axial-flow ventilation. An adopted shaft is provided with an external circumferential spiral groove, and the spiral groove matches with axial-flow fans with two clingy ends and the same spiral directions to form an axial-flow combined ventilation apparatus; the apparatus is arranged in a rotor and at two ends of the rotor, and the extra axial space of the motor is not occupied, so that the motor is compact in structure; due to different steering directions, airflow directions are also different but the motor can be cooled; in combination with labyrinth seal, a combined cooling mode of stator closed ventilation cooling and rotor open ventilation cooling of the motor is realized, and the combined cooling mode enables the insulation reliability of a stator and the heat dissipation capability of a rotor to be both ensured and improves the motor efficiency; a stator cooling air duct consists of vent holes (2x), a stator air duct (2h) and an air duct section (6h); a rotor cooling air duct consists of vent holes (5y), gaps (9b), a spiral groove (4b) and gaps (10b); the two cooling air ducts are connected in series; and the spiral combined apparatus provides air pressures for the cooling air ducts.

Description

technical field [0001] The present invention relates to a totally enclosed self-ventilated electric motor for industrial applications and for driving railway vehicles. Background technique [0002] The heat generated by the stator and the rotor of the three-phase asynchronous motor accounts for about half, and the heat generated by the stator of the industrial motor is slightly higher than that of the rotor. The traction motor used for railway vehicles has a large workload and a large slip rate of the rotor, and the heat generated by the rotor will reach the overall heat generation. More than half of the calories; [0003] Railway vehicles run on two steel rails with a standard gauge of 1435 mm. The power module consisting of traction motors, couplings, and gearboxes is placed in this fixed space. At the same time, a certain amount of daily maintenance space needs to be reserved for the operators. At the same time, rail transit works in an open-air environment and is subjec...

AI Technical Summary

Problems solved by technology

[0011] At present, open forced ventilation traction motors are commonly used in high-speed trains and locomotives, because vehicles require high motor power, and the existing open self-ventilated motors are too large to accommodate the bogie space; open forced ventilation traction motors Independent fans and air ducts are required, and they are arranged under the carriage. The installation work is very cumbersome, and it is a very troublesome task for the entire vehicle factory.

[0012] 4. The rotor of the three-phase asynchronous motor generates a lot of heat. Usually, the operating temperature of the rotor is 50 to 100 degrees higher than that of the stator. The heat of the rotor is easily transmitted to the bearing through the shaft. The high operating temperature of the bearing will reduce the performance of the grease and reduce the life of the bearing; The excessive expansion of the inner ring of the bearing may cause the working clearance of the bearing to disappear, the bearing will be stuck and the motor will be burned

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