Steady-state, lumped-parameter model for capacitor-run,single-phase induction motors

摘要

This paper documents a technique for deriving a steady-state,lumped-parameter model for capacitor-run single-phase induction motors.The objective of this model is to predict motor performance parameterssuch as torque, loss distribution and efficiency as a function ofapplied voltage and motor speed as well as the temperatures of thestator windings and of the rotor. The model includes representations ofboth the main and auxiliary windings (including arbitrary externalimpedances) and also the effects of core and rotational losses. Thetechnique can be easily implemented and the resultant model can be usedin a wide variety of analyses to investigate motor performance as afunction of load, speed, and winding and rotor temperatures. Key to thepracticality of this technique is the methodology presented in the paperfor deriving model parameters based upon a simple set of measurements.This methodology takes advantage of the speed of digital computationwhich permits a search of parameter space to find a parameter set thatbest matches the measured motor performance. Finally, an example of thetechnique is presented based upon a 3.5 kW, single-phase, capacitor-runmotor and the validity. of the technique is demonstrated by comparingpredicted and measured motor performance