Optimal current control strategies for surface-mounted permanent-magnet synchronous machine drives

The current waveforms for optimal excitation of surface-mounted permanent-m agnet synchronous machines are set forth. Four different modes are consider ed, involving varying degrees of minimization of rms current and torque rip ple. The optimized waveforms are markedly different than the traditional si nusoidal or rectangular excitation schemes. Inclusion of cogging torque and arbitrary degree of torque ripple minimization generalize this work over t hat of previous authors. An experimental drive and a detailed computer simu lation verify the proposed control schemes.