Measurement of flux linkage in the hybrid stepping motor drive

A hybrid stepping motor is an electromechanical, incremental motion device usually used in positioning applications. In its simplest operation mode, this motor is designed to provide precise positioning control to within an integer number of steps without using position sensors in its simplest operation mode. However, their step response exhibits overshoot and relatively long settling time. Additional sensing coils or probing magnetic sensors are possible ways to obtain improved magnetic properties, however, these methods involve modifications to the motor hence complicating the motor design and making it impossible to apply to motors which have already been built. One possible way to obtain the magnetic behaviour of a motor is to calculate the stator flux linkage indirectly from the measurements on the phase winding circuit using Faraday´s Law of electromagnetic induction. A brief description on the test method and results performed on a frame size 1100 (4.2 inch diameter), single stack hybrid stepping motor is presented in this paper