Stator assembly, motor and air conditioner

Abstract

The invention provides a stator assembly, a motor and an air conditioner. The stator assembly comprises a stator iron core, a yoke portion of the stator iron core is provided with a plurality of cooling flow channels, each cooling flow channel comprises a first circulation section, and the area of the radial cross section of each first circulation section decreases gradually along the axial direction of the stator iron core. According to the invention, the radial section area of one end of the first circulation section is larger than the radial section area of the other end of the first circulation section, so that the opening of the stator core in the area with the small radial section area of the first circulation section is small, and the sharp increase of the iron loss of the yoke part of the core caused by the overlarge opening can be prevented; and meanwhile, the area with the large radial section area of the first circulation section can ensure the flow of the cooling medium, so that effective cooling of the stator core of the motor is ensured, the cooling effect is ensured, and the power density, the torque density and the stability of the motor can be improved.

Description

technical field [0001] The invention belongs to the technical field of motor manufacturing, and in particular relates to a stator assembly, a motor and an air conditioner. Background technique [0002] The motor is affected by various losses during operation, and the heat generation problem has always been a key and difficult issue in the design and development process. The higher the temperature of the stator, the greater the loss at the same current, the lower the electromagnetic performance, and it cannot even run for a long time. As far as the existing technology is concerned, the cooling of the stator generally adopts heat pipes embedded in the winding to dissipate heat, or conduct heat dissipation through the casing containing water cooling channels, or directly ventilate and cool the stator and winding in the casing. In order to ensure the cooling effect, generally, it is necessary to open holes in the yoke of the stator core to form a circulation channel for the coo...

AI Technical Summary

Problems solved by technology

In order to ensure the cooling effect, generally, it is necessary to open holes in the yoke of the stator core to form a circulation channel for the cooling medium. If the opening is too large, the local magnetic density near the cooling flow channel (opening) will increase, resulting in the excavation. The iron loss in the local area of ​​the hole increases sharply (because the iron loss of the stator is proportional to the square of the magnetic density), while the opening is too small, the flow rate of the cooling medium is small, and the cooling effect is not good

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