DC Servomotors-Modeling and Parameter Determination

Present methods of defining and measuring the parameters of separately excited dc servomotors are inadequate. Eight practical servomotor models are identified, and the parameters of each model are clearly defined. Testing procedures are given for determining a servomotor´s model type and all the model parameters based only on the current response of the machine to a step input of armature voltage. Excellent agreement is obtained between the actual current responses of several servomotors and their predicted responses obtained from the corresponding mathematical models, indicating the efficacy of the technique.