Title :
Analysis of current waveforms in permanent-magnet synchronous/stepping motors and synthesis of a stabilising signal
Author :
Pickup, I.E.D. ; Russell, A.P. ; Kwon, Yong-Soo
Author_Institution :
Electr. Eng. Lab., Manchester Univ., UK
fDate :
11/1/1992 12:00:00 AM
Abstract :
A comprehensive analytical study is presented of the current waveforms of a hybrid permanent-magnet synchronous/stepping motor exhibiting dynamic instability. It is shown that, in the stepping-motor mode, the lower-modulation envelope of the total intake-current waveform is the source of a suitable stabilising signal. A low-cost stabilisation scheme is developed which utilises this signal to frequency-modulate the supply voltage. Stable operation in 10000 step/s, under conditions of significant torque loading, is demonstrated for a 200 step/revolution bifilar-wound stepping motor
Keywords :
permanent magnet motors; stability; stepping motors; synchronous motors; bifilar-wound stepping motor; current waveforms; dynamic instability; low-cost stabilisation scheme; lower-modulation envelope; permanent-magnet; stabilising signal synthesis; stepping motors; synchronous motors; total intake-current waveform;
Journal_Title :
Electric Power Applications, IEE Proceedings B
