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AssigneeCitizen Watch Co., Ltd.
InventorsShigeyuki Takahashi, Takanori Nanya, Takayasu Machida, Kazuo Suzuki, Takeaki Shimanouchi
Estimating the term…
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 (θ1). 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.
A two-pole step motor for a timepiece comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
Backward citations are indexed for grants only.
By electromechanical step-advancing mechanisms: with rotating armature
With magnets rotating within the armatures: having horseshoe armature cores
Electromechanical clocks or watches
Dynamo-electric machines
Term end not estimated
The invention relates to a two-pole step motor for an analog electronic timepiece.
Since an analog electronic timepiece employs a cell for its power source, the analog electronic timepiece stops its function after continuous operation for a given length of time period due to exhaustion of its capacity. Accordingly, the cell need be replaced periodically with a new one, which has been quite troublesome to users.
Further, as the users have to ask specialist shops to do such replacement, it has been impossible to have the cell replaced immediately if the cell runs down when there is a need for use of the analog electronic timepiece, and consequently, this has caused a great deal of inconvenience to the users.
FIG. 1 is a plan view showing a schematic construction of a two-pole step motor for a timepiece according to a first embodiment of the invention.
FIG. 2 is a plan view showing the construction of a stator of the two-pole step motor for a timepiece in FIG. 1.
FIG. 3 is a graph showing the relation between a holding torque of the two-pole step motor for a timepiece in FIG. 1 and a power consumption of the same.
The embodiments of the inventions are now described in detail with reference to the accompanied drawings.
First Embodiment: FIGS. 1 to 4
FIG. 1 is a plan view showing a schematic construction of a two-pole step motor for a timepiece according to a first embodiment of the invention, FIG. 2 is a plan view showing the construction of a stator of the two-pole step motor for a timepiece in FIG. 1, FIG. 3 is a graph showing the relation between a holding torque of the two-pole step motor for a timepiece in FIG. 1 and a power consumption of the same, and FIG. 4 is a graph showing the relation between an initial phase angle of the two-pole step motor for a timepiece in FIG. 1 and a power consumption of the same.