Abstract: Th is paper discusses the op t imal design of permanentmagnetDC tachogenerato r, then presents the heurist ic characters, the p rocess of running genet ic algo rithm (GA ) and simulated annealing algo rithm(SAA ) , and thereby demonst rates that the two algo rithm s are idealmethods in the mo to r op t imal design.

Key words: tachogenerato r, op t imal design, simulated annealing algo rithm, genet ic algo rithm