Patent EP0341867A1 successfully refreshed from Google Patents.
EP0341867A1
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EP
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Pulse motor
Assignee: Oki Electric Industry Co Ltd
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Filing: 1989-04-27
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Granted: —
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Expires: 2009-04-27
Abstract
Abstract In a pulse motor comprising a rotor, a drive coil excited by a predetermined drive current to drive the rotor, and a yoke for guiding a magnetic flux generated by the drive coil to a predetermined magnetic path; the yoke is provided with a through-hole to restrict the flow path of an eddy current induced by the magnetic flux generated by the drive coil.
Inventors
- 👤 Hiroshi Oki Electric Industry Co. Ltd. Kikuchi
- 👤 Ltd. Tanuma Jiro Oki Electric Industry Co.
- 👤 Tadashi Oki Electric Industry Co. Ltd. Kasai
- 👤 Masayuki Oki Electric Industry Co. Ltd. Ishikawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 19:45
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/12; H02K1/14; H02K1/145; H02K21/00; H02K21/12; H02K21/14; H02K21/145; H02K37/00; H02K37/10; H02K37/12; H02K37/14; H02K2201/00; H02K2201/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
64 words
A pulse motor comprising: a rotor; a drive coil excited by a predetermined drive current to drive the rotor; and a yoke for guiding a magnetic flux generated by the drive coil to a predetermined magnetic path; wherein the yoke is provided with a throughhole to restrict the flow path of an eddy current induced by the magnetic flux generated by said drive coil.
Claim 2
Dependent Claim
64 words
A pulse motor comprising: a rotor; a drive coil excited by a predetermined drive current to drive the rotor; and a yoke for guiding a magnetic flux generated by the drive coil to a predetermined magnetic path; wherein the yoke is provided with a throughhole to restrict the flow path of an eddy current induced by the magnetic flux generated by said drive coil.
Claim 3
Dependent Claim
18 words
A pulse motor according to claim 1, wherein said through-hole intercepts the flow path for the eddy current.
Claim 4
Dependent Claim
27 words
A pulse motor according to claim 1, wherein said through-hole comprises circular perforations arranged in rows in the direction crossing the flow path of said eddy current.
Claim 5
Dependent Claim
26 words
A pulse motor according to claim 1, wherein said through-hole comprises an elongated hole extending in the direction crossing the flow path of said eddy current.
Claim 6
Dependent Claim
42 words
A pulse motor according to claim 1, wherein said through-hole is formed at an appropriate interval portion between adjacent magnetic poles to avoid interception of the magnetic path for the magnetic flux passing through the magnetic poles necessary for the motor drive.
References Cited (Backward Citations)
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