Winding for subjecting the rotor of a stepping motor to two magnetic fields symmetric to two perpendicular axes by energization of one winding

摘要

The electromagnetic stepping motor comprises a first winding (g) and at least one second winding (p.sub.1). The stator (1) has four polar expansions (10, 11, 12, 13) surrounding the rotor (2) such expansions being separated by slots or saturable necks (6, 7, 8, 9). The flux generated by energization of the first winding is separated into two parts (&phgr;.sub.1, &phgr;.sub.2) of which one (&phgr;.sub.2) passes through the core of the second winding (p.sub.1) in order to subject the rotor to two magnetic fields which are substantially symmetric relative to two perpendicular axes (x, y). According to the connection of the windings and the signals applied, the motor may step forward or backward, or in either sense at an accelerated speed. Such a motor is particularly suited to drive a timepiece movement.