In controlling a permanent magnet synchronous motor (hereinafter referred to as a PM motor), a PWM inverter is used to create a command current. An understanding of loss is essential for increasing PM motor efficiency. It is known that core iron loss and core copper loss increases due to PWM carrier harmonics. Loss analyses that account for current waveform harmonics with control are useful for this reason.
A control block can be defined with circuit information and displacement as state variables. By using a high-accuracy plant model (hereinafter referred to as a JMAG-RT model), it is possible to reduce the amount of time required to reach a steady state, and loss and efficiency can be evaluated more effectively.
This document describes how to calculate the harmonic loss of a current controlled (PWM controlled) PM motor at a high speed using JMAG-RT models.