Inner rotor motor cooling structure

Abstract

The invention belongs to the technical field of motors, and relates to an inner rotor motor cooling structure, which comprises a rotor cooling assembly and a stator cooling assembly, and is characterized in that the rotor cooling assembly comprises a rotor heat pipe arranged in a rotor core and a centrifugal fan positioned at the end part of the rotor core, and one end of the rotor heat pipe is positioned in a rotor cooling hole of the rotor core; the other end of the rotor heat pipe is located in a fan cooling hole of the centrifugal fan, and the stator cooling assembly comprises a stator heat pipe installed in the stator iron core. The inner rotor motor cooling structure has the advantage that the cooling effect on the motor stator and rotor can be improved on the basis of not obviouslyincreasing the motor machining process difficulty and the manufacturing cost.

Description

technical field [0001] The invention belongs to the technical field of motors, and relates to a cooling structure of an inner rotor motor. Background technique [0002] With the rapid development of industrial technology, the performance requirements of motors in various industrial fields are getting higher and higher, which promotes the development of motors in the direction of high power density, and an effective cooling system is the premise and guarantee for increasing the power density of motors. Therefore, proposing and optimizing the motor cooling system has become an urgent task to improve the power density of the motor. [0003] At present, the use of frequency converters in driving motors makes the speed regulation of permanent magnet motors simple and feasible, but at the same time, it leads to increased eddy current loss of permanent magnet motor magnets and increased magnet temperature. Therefore, the places where the temperature rise of the permanent magnet mo...

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Problems solved by technology

Although this method can cool the stator, since the heat pipe is inside the shaft, the heat of the permanent magnet needs to be transferred to the heat pipe of the shaft through the rotor core. Since the distance between the permanent magnet and the heat pipe of the shaft is relatively long, the thermal resistance between them is relatively large. Larger, the cooling effect of this method on the rotor is not obvious

[0007] Chinese patent CN103427560A discloses the structure of using heat pipes to enhance the cooling effect of motors. Using the characteristics of strong plasticity of heat pipes, it is proposed that heat pipes can be placed at the points where the temperature of the motor is higher , such as binding a heat pipe at the end of the stator winding, but it is difficult to form surface contact between the heat pipe and the end of the winding, and this method has no obvious effect on reducing the temperature rise of the winding

However, the heat pipe in this way will occupy the space of the stator slot, resulting in a low motor slot full rate, increasing the difficulty of winding the motor winding off the assembly line, requiring higher motor processing technology, and also causing a significant drop in motor power density

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