PARAMETERS AND VOLT-AMPERE RATINGS OF A SYNCHRONOUS MOTOR DRIVE FOR FLUX-WEAKENING APPLICATIONS

This paper deals with the selection of the motor parameters and the in verter power ratings for a permanent-magnet (PM) synchronous motor dri ve in order to meet a given flux-weakening torque versus speed charact eristic, Appropriate combinations of stator PM flux linkage, d- and q- axis inductances, and inverter current rating at a given voltage are d erived, in normalized values, as functions of the specified flux-weake ning speed range and torque limits, By means of these sets of data, th e drive designer can easily individuate and compare all the suitable s ynchronous motors (defined by the d- and q-axis inductances and flux l inkage) and the related inverter volt-ampere ratings, for the desired flux-weakening performance, Therefore, this paper can be considered a synthesis work rather than an analysis one and can profitably be used for an optimal design of a synchronous motor drive.