Title:
STEPPING MOTOR, MOVEMENT FOR WATCH, AND WATCH
Document Type and Number:
Japanese Patent JP2015007584
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a compact and inexpensive stepping motor capable of easily reducing the step angle of a rotor, to provide a movement for watch, the movement being provided with the stepping motor, and to provide a watch provided with the movement for watch.SOLUTION: A stepping motor comprises: a rotor 50 in which a first magnetic pole part and a second magnetic pole part are alternately arranged in a circumferential direction; and a stator 30 having a stator yoke 31 in which an opening 35 is formed. The rotor 50 includes: a magnet 52 magnetized in axial direction; a first yoke 53 having a plurality of first claw parts 55 arranged apart in circumferential direction on the radially outer side; and a second yoke 56 having a second claw part 58 arranged between the plurality of first claw parts 55 on the radially outer side. The stator 30 includes: one coil 45; a magnetic saturation part 37; a holding torque generation part 40 for causing a holding torque to act; a first relief part 43a; and a second relief part 43b.
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Inventors:
SATODATE TAKAYUKI
Application Number:
JP2013132964A
Publication Date:
January 15, 2015
Filing Date:
June 25, 2013
Export Citation:
Assignee:
SEIKO INSTR INC
International Classes:
G04C3/14; H02K37/14; H02K37/24
Attorney, Agent or Firm:
Mountain stream 徹
Kentaro Kuhara
Noriaki Uchino
Nobuyuki Kimura
Kentaro Kuhara
Noriaki Uchino
Nobuyuki Kimura