Transient and Steady-State Measurement of Slip in Induction Motors

The measurement of the slip of an induction motor is a common industrial and educational measurement. Traditional methods of slip measurement, of which some of the most common are outlined, tend to be either inaccurate or cumbersome. A recently developed instrument which may be used for both transient and steady-state measurements, is described, which is easy to use and accurate results are quickly obtained. It is not necessary to make any connections to the supply or to fit a transducer to the shaft of the machine.