Determination of the Torque Characteristics of a Stepper Motor

The term motor should be understood as the converter of an electrical energy into a mechanical energy. The stepper motor converts electrical signals in form of impulses, for the angle of rotation. The relationship is proportional, so that the stepper motor rotation speed is dependent on the frequency of the control impulses. The research concerns developed prototype of glue distributing machine. Its task is to glue coating parts and seats used in machines and mass transit vehicles. Parts to be bonded are characterized by great variety and complicated geometry. Due to the high requirements for constant quality of applied adhesive layer and the shortest possible operation time, it is necessary to apply specialized propulsion and control system. The article presents the results of research regarding the identification of torque characteristics in a function of rotational speed of the stepper motor. In addition, torque variations for different values of the supply current of motor coils where determined. Actual characteristics of stepper motor were necessary due to the frequency increase selection method applied in the project. This will enable the accurate control of the stepper motor.