Two-pole step motor for timepiece

A The two-pole step motor for a timepiece comprising:

• a rotor including a rotor magnet and a rotor axle;
• a stator comprising a high-permeability material, having a rotor hole in which the rotor is installed;
• and
• a field coil for excitation including a magnetic core comprising a high-permeability material around which a conductor is wound, and opposite ends of which are magnetically bonded to opposite ends of the stator;
• wherein the stator comprises a plurality of holding torque setting means disposed on inner periphery of the rotor hole at installation angles differing in a direction of the inner periphery;
• and
• wherein at least one of the plurality of the holding torque setting means is formed in share asymmetrical with respect to a center of the rotor hole,
• wherein said holding torque setting means formed in a shape asymmetrical with respect to the center of the rotor hole comprises a pair of protuberances facing each other, formed on the inner periphery of the rotor hole, on opposite sides of the center of the rotor hole.