Omega Sa

Michel Grosjean

Mai Tu Xuan

A method for slaving a stepping motor proposes several levels of width of the control pulses U in order to adapt the torque provided by the motor to the load imposed thereon. The method includes measurement of the induced voltage Ui during a time interval T.sub.Ui situated immediately before the end of the control pulse U if the duration of such pulse does not exceed a predetermined duration T.sub.n (FIG. 8) or within a gap T.sub.x opened in the control pulse U if such pulse does exceed said predetermined duration T.sub.n (FIG. 11). The method may be applied to slaving stepping motors wherein the stator exhibits air gaps or saturable zones.

Growing community of inventors

Bienne, Switzerland

Michel Grosjean