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JPS552384A - Small-sized step motor for electronic watch - Google Patents

Small-sized step motor for electronic watch

Info

Publication number
JPS552384A
JPS552384A JP4930279A JP4930279A JPS552384A JP S552384 A JPS552384 A JP S552384A JP 4930279 A JP4930279 A JP 4930279A JP 4930279 A JP4930279 A JP 4930279A JP S552384 A JPS552384 A JP S552384A
Authority
JP
Japan
Prior art keywords
small
step motor
stator
rotor
concave
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP4930279A
Other languages
Japanese (ja)
Inventor
Yasuhiro Fukushima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seiko Instruments Inc
Original Assignee
Seiko Instruments Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seiko Instruments Inc filed Critical Seiko Instruments Inc
Priority to JP4930279A priority Critical patent/JPS552384A/en
Publication of JPS552384A publication Critical patent/JPS552384A/en
Pending legal-status Critical Current

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Abstract

PURPOSE: To control a stop position of the rotor easily by providing a small concave to the inside of circular hole of the stator so that the concave is located incliningly to the direction of exciting flux.
CONSTITUTION: The rotor 13 with a pair of poles is rotatably placed in the circular hole 16 of the stator 11 through air gap. A concave 17, which is sufficiently small as compared with the hole 16, is provided to the inside of the hole 16 so that it is located incliningly to the direction of exciting flux of the stator, for example, an angle α shown in Figure is about π/4. By this way, an increase of driving power is prevented, a stop position of the rotor is easily controlled with a greater static torque, a step motor which is stable and suitable for mass production can be obtained.
COPYRIGHT: (C)1980,JPO&Japio
JP4930279A 1979-04-20 1979-04-20 Small-sized step motor for electronic watch Pending JPS552384A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4930279A JPS552384A (en) 1979-04-20 1979-04-20 Small-sized step motor for electronic watch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4930279A JPS552384A (en) 1979-04-20 1979-04-20 Small-sized step motor for electronic watch

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP49072509A Division JPS5917613B2 (en) 1974-03-07 1974-06-25 small step motor

Publications (1)

Publication Number Publication Date
JPS552384A true JPS552384A (en) 1980-01-09

Family

ID=12827133

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4930279A Pending JPS552384A (en) 1979-04-20 1979-04-20 Small-sized step motor for electronic watch

Country Status (1)

Country Link
JP (1) JPS552384A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1282017A2 (en) * 1998-06-11 2003-02-05 Citizen Watch Co., Ltd. Two-pole step motor for timepiece

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB955986A (en) * 1959-09-18 1964-04-22 Solari & C Spa Improvements in or relating to electromagnetic step-by-step driving apparatus
US3142774A (en) * 1960-12-22 1964-07-28 Gen Time Corp Synchronous timing motor assembly
US3256453A (en) * 1962-08-27 1966-06-14 Cons Electronics Ind Synchronous motors

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB955986A (en) * 1959-09-18 1964-04-22 Solari & C Spa Improvements in or relating to electromagnetic step-by-step driving apparatus
US3142774A (en) * 1960-12-22 1964-07-28 Gen Time Corp Synchronous timing motor assembly
US3256453A (en) * 1962-08-27 1966-06-14 Cons Electronics Ind Synchronous motors

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1282017A2 (en) * 1998-06-11 2003-02-05 Citizen Watch Co., Ltd. Two-pole step motor for timepiece
EP1282017A3 (en) * 1998-06-11 2003-03-05 Citizen Watch Co., Ltd. Two-pole step motor for timepiece
US6774513B2 (en) 1998-06-11 2004-08-10 Citizen Watch Co., Ltd Two-pole step motor for timepiece

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