Water cooling method and structure for traction electric machine

Abstract

A water cooling method and structure for a traction motor. The stator water cooling method is adopted, and the stator base is changed into a four-channel cooling structure with an outer square and an inner circle. The four corners formed by the outer wall form four axially arranged cooling water channels, which are separated from each other by the ribs formed at the thinnest part of the inner ring of the machine base and the outer square shell, and then connected by connecting holes to form a roundabout way. Arranged cooling circuit; the motor is cooled by four cooling water channels arranged in a straight line in the axial direction formed by the inner circle of the motor casing and the outer square outer wall. At the same time, there are cooling water passages on the end covers at both ends. Part of the cooling water passages on the machine base communicate with the water passages on the end covers at both ends, and form two branched circuitous cooling circuits through the annular cooling water passages on the end covers. The cooling of the traction motor is through the circulation of cooling water in the square circuitous water channel and the cooling water in the annular cooling water channel on the end cover to dissipate heat.

Description

technical field [0001] The invention relates to a cooling method of a traction motor, in particular to a water cooling method for a stator of a traction motor; the invention also relates to a cooling device structure of a traction motor, in particular to a water cooling device structure of a traction motor stator. Background technique [0002] Because the traction motor is limited by the space volume and weight, the motor adopts high electromagnetic load, the loss generated by the motor is relatively high, and the heat generation of the motor is serious, so the cooling system of the motor must be installed to improve its heat dissipation capacity. [0003] At present, the cooling methods of traction motors mainly include natural cooling, forced air cooling, self-ventilation, liquid-filled cooling, heat pipe cooling and water cooling, among which the water cooling method is more widely used for traction motors with relatively high power density, such as: low-floor cities Driv...

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Problems solved by technology

[0008] 4. Due to the relatively large thermal time constant, the thermal overload of the motor is relatively high

[0015] 5. It is necessary to install a water / air heat exchange device externally, which increases the cooling equipment and increases the maintenance work and cost of motor operation

[0028] However, both domestic and foreign water-cooled traction motors use a circular shell frame. This circular shape will make the space very tight for high-power-density motors with limited volume, which will affect the cooling effect.

Through experiments, it is found that it is not suitable to directly apply the existing motor water cooling technology to high power density motors, so it is necessary to further improve the cooling system of the motor to increase its heat dissipation capacity

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