External rotor car permanent magneto

Abstract

An external-rotor type permanent-magnet generator for vehicles: a rotor and a stator are both mounted in a housing which consists of a front end cover and a rear end cover; the stator is firmly arranged on the rear end cover; the permanent-magnet rotor is positioned outside the stator; a centrifugation fan is mounted on the rotor in the rear end of the rotor; the permanent-magnet rotor is composed of a rotor case and a tile-shaped permanent magnet; the front end of the rotor case comprises a vent hole; a centrifugation fan is exposed to mount in the vent hole. During operation, the rotor is driven to rotate via an engine, so that two cooling air circuits will be formed inside the motor: one circuit is a cooling air circuit formed by the centrifugation fan on the rear end of the rotor; the circuit is mainly used to cool the rectification voltage stabilizer; the other circuit is a cooling air circuit that is formed with the rotor centrifugation fan exposed out of the rotor housing; the circuit mainly adapts to cool the rectification voltage stabilizer and the stator. Compared with the prior art, the invention has advantages of high utilization rate of iron core materials, convenient stator coiling, simultaneous effects with the two centrifugation fans, perfect heat radiation effects, low temperature of the stator and the rectification voltage stabilizer, and reliable operation.

Description

technical field [0001] The invention relates to a permanent magnet generator for vehicles, which can supply power for electrical appliances on the vehicle and charge batteries. Background technique [0002] The existing permanent magnet generators for vehicles all adopt the structure of outer stator and inner rotor. The problems of this structure are as follows: [0003] 1 The central part of the stator core has a material equivalent to the diameter of the rotor that cannot be utilized, resulting in a large waste. [0004] 2 The notch of the stator core faces inward, so it is difficult to insert wires, the production efficiency is low, and the cost is high. [0005] 3 Since the rotor is surrounded by the stator, the heat transferred from the stator to the rotor is not easy to dissipate, and the high temperature of the rotor will easily cause demagnetization of the permanent magnet and reduce the performance of the generator. [0006] If the vehicle permanent magnet generat...

AI Technical Summary

Problems solved by technology

[0003] 1 The central part of the stator core has a material equivalent to the diameter of the rotor that cannot be utilized, resulting in a large waste

[0004] 2 The notch of the stator core faces inward, so it is difficult to insert wires, the production efficiency is low, and the cost is high

[0005] 3 Since the rotor is surrounded by the stator, the heat transferred from the stator to the rotor is not easy to dissipate, and the high temperature of the rotor will easily cause demagnetization of the permanent magnet and reduce the performance of the generator

[0006] If the vehicle permanent magnet generator structure is simply changed to a technical solution similar to the motorcycle magneto, that is, the structure of the inner stator and the outer rotor, the above problems do not seem to exist. However, due to the large current of the stator of the vehicle generator, the rectifier The voltage stabilizing device and the stator are extremely hot. Without forced heat dissipation, the motor cannot work normally, and it is difficult to install a conventional fan. Therefore, there is no permanent magnet generator product for vehicles with an inner stator and an outer rotor. Appear

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