METHOD OF FOLLOWING STEPPING MOTOR DRIVEN BY BIPOLAR PULSE TRAIN BY LOAD APPLIED BY TIME PIECE MECHANISM AND DEVICE FOR DRIVING STEPPING MOTOR

摘要

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 TUi situated immediately before the end of the control pulse U if the duration of such pulse does not exceed a predetermined duration Tn (FIG. 8) or within a gap Tx opened in the control pulse U if such pulse does exceed said predetermined duration Tn (FIG. 11). The method may be applied to slaving stepping motors wherein the stator exhibits air gaps or saturable zones.