Regeneration characteristics of speed sensorless control methodbased on phase difference

摘要

A simple speed control method is needed for small inductionmotors. Previously, the authors have proposed a simple speed sensorlesscontrol method for small induction motors. In this method, the loadtorque is estimated from the phase difference between the stator currentand the stator voltage, and the drive frequency is calculated from theestimated torque. As a result the average speed of the induction motorremains constant. This paper presents the principle of this method andthe experimental results including the regenerative regions with a 400 Winduction motor