| In modern society,with the increasing demands of various electric loads on the car as well as a growing awareness of intelligent and comfortable vehicle,automobile comprehensive performance will be crucial. As the claw pole generator with a light weight, small size and other characteristics, therefore, through its parallel with batteries are widely used in automotive power supply system, but also because the rotor with claw pole this special structure, accompanied by many problems exist in the motor materials, structures, and other aspects of the production process, resulting in a claw-pole generator currently there is a low output efficiency, low speed motor electromagnetic noise and other shortcomings. Therefore, using3D finite element method, the rational analysis of claw pole generator internal electromagnetic characteristics, and by combining theoretical calculation with the finite element method to calculate the influence motor electromagnetic noise of the air gap in the radial electromagnetic force of further optimization of claw pole machine comprehensive performance is particularly critical.This paper uses3D finite element analysis software Maxwell through the pretreatment, model simulation, post-processing and other operations, the claw pole alternator is modeled by the three dimensional static and transient field electromagnetic modeling, through the FEM to research and analyse the motor internal magnetic field, which focus on analyzing the motor internal magnetic field at rated speed under no-load and load, considering the load armature reaction impact of the internal magnetic field of motor. The height of the stator, the air gap length,thickness and width of claw pole tip and root of the influence law of claw pole generator output, put forward a theoretical reference for the improvement of claw pole motor performance.Finally, through the magnetic potential multiplied by magnetic conductance method to calculate the claw pole generator the amplitude values of radial electromagnetic force in the air gap at3000rpm, mainly solving36order radial force wave which is caused by the the main pole magnetic field of fundamental wave and magnetic conductivity of first-order tooth harmonic interaction, because it’s the primary sources of the claw pole synchronous motor electromagnetic noise, and using the time stepping finite element method to solve the radial electromagnetic force. The experimental results verified the accuracy of theoretical calculation, noise also prove the reliability of the calculation method. |
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