Optimum design method for flux leakage problem of alternating-current generator for car

Abstract

The invention relates to an optimum design method for a flux leakage problem of an alternating-current generator for a car. The optimum design method comprises the steps that the basic parameter of a finite element model is set, and the basic structure parameter of the alternating-current generator is set; no-load electromagnetic models of a rotor, a stator, a stator winding and a field winding of the alternating-current generator are set, and a transient electromagnetic field of a motor is solved through a three-dimensional finite element method; boundary adding is carried out on the dynamic parts of the models; excitation is added to the field winding; mesh generation is carried out on the finite element model, and a solving option is defined, and comprises the simulation time of the no-load electromagnetic models, step length and motor rotating speed; leakage flux is measured quantitatively by calculating leakage inductance, the no-load leakage coefficient of the alternating-current generator is calculated, and motor structure parameter optimization is carried out according to the flux leakage problem. A novel design concept is built, the leakage flux of a permanent magnet generator is analyzed and calculated again, a magnetic structure and a control system are improved, the leakage flux of the permanent magnet generator is reduced, the running efficiency of the motor is improved, and production cost is controlled.

Description

technical field [0001] The invention belongs to the technical field of automobile motors, and in particular relates to an optimal design method for the magnetic flux leakage problem of an automobile alternator. Background technique [0002] With the rapid development of the automobile field, people put forward new requirements for the comfort, energy saving and environmental protection of the automobile, so it is more and more important to improve the efficiency of the generator in the automobile. The claw machine type (delete all the claw machine types later and replace them with vehicles or automobiles) alternators are widely used in modern cars because of their small size and weight, but now the claw machine AC generators for automobiles Generators all have the problem of low efficiency when they are in use. Therefore, it is necessary to rationally optimize the design of the claw machine motor. [0003] The biggest difference between a permanent magnet generator and an ...

AI Technical Summary

Problems solved by technology

In addition, the magnetic circuit structure of the permanent magnet generator is various, the leakage magnetic circuit is very complex and the proportion of the leakage flux is relatively large, the ferromagnetic material part is relatively easy to saturate, and the magnetic permeability is nonlinear

These all increase the complexity of the electromagnetic calculation of the permanent magnet generator, making the accuracy of the calculation result lower than that of the electric excitation generator

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