Circumferential-winding-type automobile generator stator winding arrangement method with high heat dissipation rate

Abstract

The invention discloses a circumferential-winding-type automobile generator stator winding arrangement method with high heat dissipation rate. The method comprises a stator magnetic core with groovesformed in the axial direction and a stator winding, the stator magnetic core is of a circular structure, a plurality of inner groove paths are formed in one side of the inner circle of the circular structure in the axial direction, a plurality of outer groove paths are formed in one side of the outer circle of the circular structure in the axial direction, or one side of the outer circle of the circular structure is sleeved with an insulating support provided with a plurality of outer groove paths in the axial direction, and the outer groove paths on the insulating support are used for supporting and limiting coils wound on the outer groove paths. According to the stator winding arrangement method, the coils are wound on the circumference of the circular structure along the inner groove paths and the outer groove paths, the inner-layer coil of the winding penetrates through the inner groove paths and the outer groove paths of the stator magnetic core, and the inner-layer coil of the winding is tightly attached to the circumferences of the two axial end faces of the circular structure of the stator magnetic core so as to improve the heat dissipation efficiency of the stator winding.The magnetic poles at two sides of the inner groove paths of the stator winding are used for forming a magnetic flux alternating magnetic circuit with automobile generator rotor magnetic poles duringoperation.

Description

technical field [0001] The invention belongs to the technical field of advanced manufacturing of automobile generators, in particular to a method for arranging stator windings of a circumferentially wound high heat dissipation rate automobile generator. Background technique [0002] With the progress of science and technology and the development of transportation in human society, automobiles have become an indispensable means of transportation for social production and people's lives. [0003] As the main energy conversion component in automobiles, automobile generators need to withstand harsh working environments such as high temperature, vibration, high current impact, and long-term continuous work. The temperature rise of automobile generators is an important technical factor that restricts their service life. . [0004] Automobile generators in the prior art generally adopt a stator core with a circular structure, and one side of the inner circle of the magnetic core i...

AI Technical Summary

Problems solved by technology

[0009] 1. The distance between the end of the coil and the iron core is relatively large. The measured distance of most automobile generators is 5-20mm, which makes it difficult to shape the end, especially because there is no contact between the end and the iron core to dissipate heat, and it can only rely on fan airflow Heat dissipation and heat radiation heat dissipation. As we all know, the working current of automobile generators is relatively large, the DC output current can reach 100-200A, and the phase winding current can reach 30-70A. Such a large current will cause a large amount of resistive heating of the coil, causing The high temperature of the coil, because the heat of the straight conductor part can be transferred to the iron core in time through contact heat dissipation, the temperature rise of the end of the coil is obviously higher than that of the straight conductor part in the tank due to the lack of heat dissipation. When the generator is burned at high temperature, most of the ends are blackened, and the straight conductor part is still slightly damaged.

[0010] 2. The distance between the end of the coil and the iron core is relatively large. In order to facilitate the embedding and shaping of the end of the coil, a certain amount of coil length is reserved, so that the coil is relatively loose and not compact, and the probability of misalignment and bending of the straight conductor is relatively high. Enabling magnetic field waveform distortion reduces efficiency

[0011] 3. The distance between the end of the coil and the iron core is relatively large, and a certain amount of coil length is reserved for the coil, which increases the DC impedance of the effective coil and increases the copper loss, which increases the "copper loss" during work, which is not conducive to heat dissipation

[0013] 5. When the traditional winding is used, the outer opening of the stator core slot needs slot signs to compact the conductor in the slot to prevent the coil from loosening out of the slot, which increases the cost of the assembly process and limits the slot fullness rate

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