Design And Research Of A42V PM Automotive Alternator

The electric excitation claw-pole alternators are widely used in automotivealternator because of its simple structure, easy manufacture, reliable operation andlow price factors. The power of the electric excitation claw-pole alternator isgenerally less than2kW, efficiency is only about60%. With the increase of theelectrical equipment in the automobile, the alternator power is growing. Obviouslythe electric excitation alternator can not meet the increasing requirement of thepower and efficiency. Compared with the electric excitation alternator, thepermanent magnet synchronous alternator has the advantage of no need ofexcitation supply, small volume, light weight, high efficiency, long service life andhigh performance-price ratio. The permanent magnet alternator may soon becomethe first choice of automotive alternator instead of electric excitation alternator. Inorder to increase the output power, a42V voltage level is selected. The42Vpermanent magnet automotive alternator can satisfy the requirements of theautomotive electricity, and consist with the development direction of the energysaving and environmental protection. The analysis of the alternator has animportant theoretical significance and value in engineering.In this paper, the softwares were used to analyze a42V/2kW PM synchronousalternator including MATLAB, ANSOFT MAXWELL, ANSOFT RMXPRT,ANSOFT SIMPLORER and etc. First, the design results of a42V permanentmagnet alternator are presented using an equivalent magnetic circuit methodincluding MATLAB programming. Second, the performance of the alternator isanalyzed in terms of various parameters including a single variable, two variablesand multivariable using the ANSOFT RMXPRT software. Again, a high outputpower permanent magnet alternator is designed based on a2D finite elementmethod, and the cogging torque and performance of the alternator in terms ofvarious parameters were studied in this paper. Then, a quasi-newton method and apattern search method are used to model and optimize a permanent magnetautomotive alternator. Finally, a permanent magnet automotive alternator system isbuilt, the co-simulation of the alternator is realized, and the performance of thealternator system are obtained.