In any factory were mass production is carried out, a way of testing the products quickly and accurately is of great importance. The permanent magnet stepper motor is a simple electromechanical device used in many types of equipment such as surveillance cameras, valves and many parts of the automotive industry. During manufacturing of such a motor, several electrical and other physical properties should be monitored closely to ensure the product conform to its specification. An error has to be detected immediately and the product must be contained.
This thesis describe the development of a test system used for production line testing of small permanent magnet stepper motors with outside diameter Ø15-35mm and a coil resistance of 1-50 Ohm. The test system is designed to test 4 motors at the same time. Two Printed circuit boards were designed with capability of measuring resistance, inductance, velocity, direction of rotation and possible short circuit between the winding and the housing of the motor. In order to mount the sensor board and allow for repeatable testing, a modular test fixture was also designed. The control of the test system is done through a graphical user interface running on a PC, to which the system also log test data.