A Novel Chopper Converter Topology For Improving The Performance Of Stepping Motors
Walid Emar, Moh'd Al-Eweisi, Musbah J. Aqel
Journal of E-Technology, Vol. 1, No. 4, 2010.
DOI: 
Link: http://www.dline.info/jet/fulltext/v1n4/3.pdf
Abstract:
This paper presents a new topology of drive circuitry for variable reluctance stepping motors (VRSM) for improving the performance of such motor by modifying its time constant and thus, increasing its stepping rate. Therefore, the initial torque developed by the motor is high; the switching from one coil to the next is faster than normal and consequently, the rotor moves as quickly as it should be. The circuitry discussed in this paper is connected directly to the motor windings and the motor power supply, and this circuitry is controlled by a digital system that determines when the switches are turned on or off.