US5225725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear direct current motor
Assignee: Shicoh Engineering Co Ltd
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Filing: 1991-09-18
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Granted: 1993-07-06
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Expires: 2011-09-18
Abstract
Abstract Disclosed herein is a linear d.c. motor comprising a field magnet composed of plural magnetic poles, and an armature formed by arranging armature coils along the moving direction of a moving element at a position facing the field magnet. One of the field magnet and armature is attached to the moving element, and the other is provided on a stator yoke serving as a stator. Projecting edges for linear guide, each of which projects outside and has a triangular form in cross section, are provided on both sides of the stator yoke, and guide rollers, each of which has an engaging groove in the form of a valley in its side part coming into slidable contact with the projecting edge for linear guide, are attached to the moving element. There is no possibility that the moving element is derailed because it is supported by the projecting edges of linear guide and the guide rollers. It is therefore possible to make the thrust of the moving element greater and cause it to travel at high speed.
Inventors
- 👤 Manabu Shiraki
- 👤 Osami Miyao
- 👤 Masayuki Ohsaka
- 👤 Masayuki Fujiwara
- 👤 Daishi Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:00
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; H02K41/03; H02K41/031
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
305 words
A linear direct current motor comprising: a field magnet formed by P (P being an integer of 2 or higher) contiguous magnetic poles of alternating N and S polarity; an armature formed by n (n being an integer of 2 or higher) armature coils arranged for movement relative to the field magnet in a moving direction, wherein each of said armature coils comprise a conductor portion to increase the amount of thrust generated by the motor; a moving element moving in the moving direction and provided with one of the field magnet and armature; a stator yoke serving as a stator and provided with the other of the field magnet and armature; a linear guide formed in the stator yoke and having projecting edges integrally formed on both sides of the stator yoke, each projecting edge projecting and having a triangular form in cross section; guide rollers, each of which has an engaging groove in the form of a valley in its side part for slidably contacting the projecting edge of the linear guide, the guide rollers being attached to the moving element so that the guide rollers engage with the projecting edges of the linear guide thereby supporting the moving element for linear movement, wherein the field magnet comprises permanent magnets of N and S polarity, which are formed of neodymium-iron-boron magnets coated with a magnet-failure proof and dust-generation proof film; a plurality of pole discriminating sensors provided on said armature to sense a magnetic pole of said field magnet, wherein each of said plurality of pole discriminating sensors is located on said conductor portion of each of said armature coils; and a groove provided in said permanent magnets to accommodate said plurality of pole discriminating sensors to prevent said sensors from contacting said magnet and to reduce a field gap in said motor.
Claim 2
Dependent Claim
305 words
A linear direct current motor comprising: a field magnet formed by P (P being an integer of 2 or higher) contiguous magnetic poles of alternating N and S polarity; an armature formed by n (n being an integer of 2 or higher) armature coils arranged for movement relative to the field magnet in a moving direction, wherein each of said armature coils comprise a conductor portion to increase the amount of thrust generated by the motor; a moving element moving in the moving direction and provided with one of the field magnet and armature; a stator yoke serving as a stator and provided with the other of the field magnet and armature; a linear guide formed in the stator yoke and having projecting edges integrally formed on both sides of the stator yoke, each projecting edge projecting and having a triangular form in cross section; guide rollers, each of which has an engaging groove in the form of a valley in its side part for slidably contacting the projecting edge of the linear guide, the guide rollers being attached to the moving element so that the guide rollers engage with the projecting edges of the linear guide thereby supporting the moving element for linear movement, wherein the field magnet comprises permanent magnets of N and S polarity, which are formed of neodymium-iron-boron magnets coated with a magnet-failure proof and dust-generation proof film; a plurality of pole discriminating sensors provided on said armature to sense a magnetic pole of said field magnet, wherein each of said plurality of pole discriminating sensors is located on said conductor portion of each of said armature coils; and a groove provided in said permanent magnets to accommodate said plurality of pole discriminating sensors to prevent said sensors from contacting said magnet and to reduce a field gap in said motor.
Claim 3
Dependent Claim
279 words
A linear direct current motor comprising: a field magnet formed by P (P being an integer of 2 or higher) contiguous magnetic poles of alternating N and S polarity; an armature formed by n (n being an integer of 2 or higher) armature coils arranged for movement relative to the field magnet in a moving direction, wherein each of said armature coils comprise a conductor portion to increase the amount of thrust generated by the motor; a moving element moving in the moving direction and provided with one of the field magnet and armature; a stator yoke serving as a stator and provided with the other of the field magnet and armature; a linear guide formed in the stator yoke and having projecting edges integrally formed on both sides of the stator yoke, each projecting edge projecting and having a triangular form in cross section; and guide rollers, each of which has an engaging groove in the form of a valley in its side part for slidably contacting the projecting edge of the linear guide, the guide rollers being attached to the moving element so that the guide rollers engage with the projecting edges of the linear guide thereby supporting the moving element for linear movement a plurality of pole discriminating sensors provided on said armature to sense a magnetic pole of said field magnet, wherein each of said plurality of pole discriminating sensors is located on said conductor portion of each of said armature coils; and a groove provided in said permanent magnets to accommodate said plurality of pole discriminating sensors to prevent said sensors from contacting said magnet and to reduce a field gap in said motor.
Claim 4
Dependent Claim
279 words
A linear direct current motor comprising: a field magnet formed by P (P being an integer of 2 or higher) contiguous magnetic poles of alternating N and S polarity; an armature formed by n (n being an integer of 2 or higher) armature coils arranged for movement relative to the field magnet in a moving direction, wherein each of said armature coils comprise a conductor portion to increase the amount of thrust generated by the motor; a moving element moving in the moving direction and provided with one of the field magnet and armature; a stator yoke serving as a stator and provided with the other of the field magnet and armature; a linear guide formed in the stator yoke and having projecting edges integrally formed on both sides of the stator yoke, each projecting edge projecting and having a triangular form in cross section; and guide rollers, each of which has an engaging groove in the form of a valley in its side part for slidably contacting the projecting edge of the linear guide, the guide rollers being attached to the moving element so that the guide rollers engage with the projecting edges of the linear guide thereby supporting the moving element for linear movement a plurality of pole discriminating sensors provided on said armature to sense a magnetic pole of said field magnet, wherein each of said plurality of pole discriminating sensors is located on said conductor portion of each of said armature coils; and a groove provided in said permanent magnets to accommodate said plurality of pole discriminating sensors to prevent said sensors from contacting said magnet and to reduce a field gap in said motor.
Claim 5
Dependent Claim
252 words
A linear direct current motor comprising: a field magnet formed by P (P being an integer of 2 or higher) contiguous magnetic poles of alternating N and S polarity; an armature formed by n (n being an integer of 2 or higher) armature coils arranged for movement relative to the field magnet in a moving direction; a moving element moving in the moving direction and provided with one of the field magnet and armature; a stator yoke serving as a stator and provided with the other of the field magnet and armature; a linear guide formed in the stator yoke and having projecting edges integrally formed on both sides of the stator yoke, each projecting edge projecting and having a triangular form in cross section; and guide rollers, each of which has an engaging groove in the form of a valley in its side part for slidably contacting the projecting edge of the linear guide, the guide roller being attached to the moving element so that the guide rollers engage with the projecting edges of the linear guide thereby supporting the moving element for linear movement, wherein the field magnet is coated with a magnet-failure proof and dust-generation proof film; a plurality of pole discriminating sensors provided on said armature to sense a magnetic pole of said field magnet; and a groove provided in said permanent magnets to accommodate said plurality of pole discriminating sensors to prevent said sensors from contacting said magnet and to reduce a field gap in said motor.
Claim 6
Dependent Claim
252 words
A linear direct current motor comprising: a field magnet formed by P (P being an integer of 2 or higher) contiguous magnetic poles of alternating N and S polarity; an armature formed by n (n being an integer of 2 or higher) armature coils arranged for movement relative to the field magnet in a moving direction; a moving element moving in the moving direction and provided with one of the field magnet and armature; a stator yoke serving as a stator and provided with the other of the field magnet and armature; a linear guide formed in the stator yoke and having projecting edges integrally formed on both sides of the stator yoke, each projecting edge projecting and having a triangular form in cross section; and guide rollers, each of which has an engaging groove in the form of a valley in its side part for slidably contacting the projecting edge of the linear guide, the guide roller being attached to the moving element so that the guide rollers engage with the projecting edges of the linear guide thereby supporting the moving element for linear movement, wherein the field magnet is coated with a magnet-failure proof and dust-generation proof film; a plurality of pole discriminating sensors provided on said armature to sense a magnetic pole of said field magnet; and a groove provided in said permanent magnets to accommodate said plurality of pole discriminating sensors to prevent said sensors from contacting said magnet and to reduce a field gap in said motor.
References Cited (Backward Citations)
US3858308A
Cited
JPS58182469A
Cited
JPS5986471A
Cited
JPS59122359A
Cited
JPS6331466A
Cited
JPS6335165A
Cited
US4935080A
Cited
US5047676A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-05 | 1997-01-04 | 1997-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-05 | 2001-01-04 | 2001-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-05 | 2005-01-04 | 2005-07-06 | $7700.00 | Window Closed / Lapsed |