Totally-closed double-circulation air-cooled motor structure

Abstract

The invention relates to the technical field of motor ventilation cooling, in particular to a totally-closed double-circulation air-cooled motor structure. The totally-closed double-circulation air-cooled motor structure comprises a first base assembly, a stator core, a rotor and a second base assembly; a stator outer circulation vent hole and a stator inner circulation vent hole are formed in the stator core; a rotor vent hole penetrating the rotor in the axial direction is formed inthe rotor; an outer circulation air inlet hole and a first inner circulation vent hole are formed in the second machine base assembly; an outer circulation air outlet hole and a second inner circulation vent hole are formed in the first machine base assembly; and the stator outer circulation vent hole, the stator outer circulation vent hole and the outer circulation air outlet hole form an outer circulation cooling air channel; and the first internal circulation vent hole, the stator internal circulation vent hole, the second internal circulation vent hole and the rotor vent hole form an internal circulation cooling air channel. According to the totally-closed double-circulation air-cooled motor structure of the invention, through the establishment of the internal circulation cooling air channel, the gas fluidity in a motor can be improved, and the heat dissipation capability of the motor is improved.

Description

technical field [0001] The invention relates to the technical field of motor ventilation and cooling, in particular to a fully enclosed double-cycle air-cooled motor structure. Background technique [0002] Traction motors for rail transit generally adopt air-cooled and liquid-cooled cooling methods, including fully enclosed air-cooled, fully-opened air-cooled, semi-opened air-cooled, casing liquid-cooled, etc. [0003] The feature of fully open air cooling is that the structure is relatively simple, the cooling air can directly cool the motor stator, rotor and bearing, and the heat dissipation capacity is high. But under normal circumstances, it is not suitable for permanent magnet motors, mainly due to the particularity of the permanent magnet motor rotor, which needs to be made into a closed structure or a semi-open structure to prevent foreign matter such as dust, moisture, acid and alkali from entering the interior of the motor, reducing the rotor and The structure and...

AI Technical Summary

Problems solved by technology

But under normal circumstances, it is not suitable for permanent magnet motors, mainly due to the particularity of the permanent magnet motor rotor, which needs to be made into a closed structure or a semi-open structure to prevent foreign matter such as dust, moisture, acid and alkali from entering the interior of the motor, reducing the rotor and The structure and performance reliability of the permanent magnet, especially to prevent the metal powder produced by the friction between the wheel and the rail when the rail vehicle is running, entering the interior of the motor and being adsorbed on the surface of the rotor of the permanent magnet motor, resulting in a smaller air gap between the stator and rotor of the motor, or even sweeping the bore , so the permanent magnet synchronous traction motor usually adopts a fully enclosed structure

[0004] The main problem of the fully enclosed air-cooled cooling solution is that the heat inside the motor, especially at the end of the winding, can only be conducted to the wall of the outer circulation duct through the air inside the motor. The conduction path is long, and the internal air flow is poor. For high torque density motors As far as the motor is concerned, the heat dissipation capacity of this cooling scheme is limited, and the temperature rise of the motor is high, especially the temperature at the end of the winding is high.

Since the heat inside the motor cannot be dissipated effectively, the internal temperature of the fully enclosed motor is much higher than that of the motor with an open ventilation and heat dissipation structure, resulting in high temperatures at the end of the stator coil, permanent magnets and bearings, reducing the reliability of the motor insulation system performance, bearing operation reliability until it affects the reliability of the whole machine

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