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2-Pole stepper motor for timepiece
| Details |
Inventors: Takahashi, Shigeyuki; Nanya, Takanori; Machida, Takayasu; Suzuki, Kazuo; Shimanouchi, Takeaki;
Assignee: Citizen Watch Co., Ltd. (Tokyo, JP)
Primary Examiner: Nguyen; Tran
Assistant Examiner:
Attorney, Agent or Firm: Armstrong, Westerman & Hattori, LLP
A stator (1) is made up by bonding a first stator part (1a) made of a high-permeability material to a second stator part (1b) made of a high-permeability material respectively by welding through the intermediary of connections (1c,1d) made of a low-permeability material or a nonmagnetic material, interposed therebetween. Paired recesses (5a, 5b) serving as holding torque setting means for holding a rotor (3) by a magnetic action are formed on the inner, periphery of a rotor hole (2) defined inside the stator (1) at the position forming an initial phase angle (.theta..sub.1). A field coil (7) for excitation is magnetically bonded to opposite ends of the stator (1), thereby forming a two-pole step motor for a timepiece |
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DETAILED DESCRIPTION What is claimed is: 1.
A two-pole step motor for a timepiece comprising: a stator including a high-permeability material, and having a rotor hole; a rotor, installed in the rotor hole, the rotor including a rotor magnet and a rotor axle; and a field coil for excitation, including a magnetic core comprising a high-permeability material and a conductor wound around the high-permeability material, opposite ends of the magnetic core being magnetically bonded to opposite ends of the stator; wherein the stator includes a plurality of holding torque setting means disposed on an inner periphery of the rotor hole at installation angles differing in a direction of the inner periphery, and an initial phase angle .
theta.
.
sub.
1 formed by a magnetic field direction line in a direction of a magnetic field produced inside the rotor hole and a magnetizing direction line of the rotor magnet at a standstill position of the rotor based on the respective installation angles of the plurality of the holding torque setting means is in a range of 50 mechanical degrees to 70 mechanical degrees.
2.
A two-pole step motor for a timepiece comprising: a stator including a high-permeability material, and having a rotor hole; a rotor, installed in the rotor hole, the rotor including a rotor magnet and a rotor axle; and a field coil for excitation, including a magnetic core comprising a high-permeability material and a conductor wound around the high-permeability material, opposite ends of the magnetic core being magnetically bonded to opposite ends of the stator; wherein the stator comprises a plurality of holding torque setting means including a combination of different type of the holding torque setting means, and the plurality of holding torque setting means have installation angles, in a direction of an inner periphery of the rotor hole, differing from each other, and the stator is made up by bonding a first stator part made of a high-permeability material to a second stator part made of a high-permeability material through an intermediary of connections made of a low-permeability material or a nonmagnetic material, and the connections serve as at least one of the plurality of the holding torque setting means
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