Optimisation of asynchronous motors - measuring current and rotation of unloaded motor at rotation speed suitable for detecting slot effect

摘要

The motor current and angular motion are measured for an unloaded motor at a revolution rate at which the slot influence can be detected. An electronic voltage dosing device is connected between the mains and the motor. The device contains a control loop which maintains a constant revolution rate of approximately 1 per cent of the synchronous revolution rate and indicates current and revolution rate directly or indirectly. USE/ADVANTAGE - For determining optimal operating conditions taking account of number of slots and field stimulation curve of rotary current asynchronous motors. Harmonics and associated torque steps are reduced.