US3867676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable reluctance linear stepper motor
Assignee: International Business Machines Corp
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Filing: 1973-09-20
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Granted: 1975-02-18
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Expires: 1993-09-20
Abstract
Abstract The poles of a variable reluctance type linear stepper motor are arranged in an odd plural number of pairs and each pole is provided with two windings. For each pole pair, one winding of the pole of the particular pair is connected in series-aiding relationship with one of the windings of the other pole of the pair. The other two windings of the particular pair of poles are also connected in series-aiding relationship. The series connected windings are selectively energizable in predetermined stepping sequences for single phase, double phase and alternate single and double phase energizing operational modes. As a result, relative motion is provided between the pole structure of the motor and its variable reluctance member. The directions of energization of the respective two series connected windings of each particular pole pair are in opposition with respect to each other. The energization is such that the change of direction of the flux through the poles is minimized between steps, thereby providing a concomitant reduction in electrical and/or heat losses.
Inventors
- 👤 Hi D Chai
- 👤 Joseph P Pawletko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:40
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/08; B; B41; B41J; B41J19/00; B41J19/18; B41J19/20; B41J19/30; B41J19/305; H02K; H02K41/00; H02K41/02; H02K41/03; H02P6/00; H02P6/006
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
400 words
A linear stepper motor having a predetermined reference axis and being of the variable reluctance type, said motor comprising: first magnetic member means having first and second surfaces disposed on first and second opposite sides, respectively, of said reference axis, said first member means having a predetermined variable reluctance characteristic at said first and second surfaces, second magnetic member means having an odd plural number of pole pairs of electromagnetic poles with respective pole faces, the pole face of one pole of each said pole pair being disposed on said first side of said reference axis in juxtaposition with said first surface, the pole face of the other pole of each said pole pair being disposed on said second side of said reference axis in juxtaposition to said second surface, a predetermined one of said first and second member means having first and second spaced sub-members disposed on said first and second opposite sides, respectively, of said reference axis, the other one of said first and second member means being disposed between said first and second sub-members, means for supporting said first and second member means for relative movement therebetween along said axis, each of said poles having first and second windings associated therewith, the said first windings of the poles of each particular pole pair being electrically interconnected in series aiding relationship, the second windings of the poles of each particular pole pair being electrically interconnected in series aiding relationship, and means for selectively energizing in respective predetermined stepping sequences said series connected first and second windings for at least one of the operational modes of single phase, double phase and alternate single phase and double phase energizing operational modes to provide relative movement between said first and second member means, said selective energizing means beiNg operative during each one of said operational modes to energize said series connected first windings of each particular pole pair in a direction opposite to the direction of energization of the series connected second windings of that particular pole pair, and said selective energizing means during each successive step being operative to energize the series connected windings selected during such successive step to provide a magnetic flux in the same direction through the pole pair associated with the series connected windings selected in the preceding step as the direction of the magnetic flux passing through the lastmentioned pole pair during said preceding step.
Claim 2
Dependent Claim
400 words
A linear stepper motor having a predetermined reference axis and being of the variable reluctance type, said motor comprising: first magnetic member means having first and second surfaces disposed on first and second opposite sides, respectively, of said reference axis, said first member means having a predetermined variable reluctance characteristic at said first and second surfaces, second magnetic member means having an odd plural number of pole pairs of electromagnetic poles with respective pole faces, the pole face of one pole of each said pole pair being disposed on said first side of said reference axis in juxtaposition with said first surface, the pole face of the other pole of each said pole pair being disposed on said second side of said reference axis in juxtaposition to said second surface, a predetermined one of said first and second member means having first and second spaced sub-members disposed on said first and second opposite sides, respectively, of said reference axis, the other one of said first and second member means being disposed between said first and second sub-members, means for supporting said first and second member means for relative movement therebetween along said axis, each of said poles having first and second windings associated therewith, the said first windings of the poles of each particular pole pair being electrically interconnected in series aiding relationship, the second windings of the poles of each particular pole pair being electrically interconnected in series aiding relationship, and means for selectively energizing in respective predetermined stepping sequences said series connected first and second windings for at least one of the operational modes of single phase, double phase and alternate single phase and double phase energizing operational modes to provide relative movement between said first and second member means, said selective energizing means beiNg operative during each one of said operational modes to energize said series connected first windings of each particular pole pair in a direction opposite to the direction of energization of the series connected second windings of that particular pole pair, and said selective energizing means during each successive step being operative to energize the series connected windings selected during such successive step to provide a magnetic flux in the same direction through the pole pair associated with the series connected windings selected in the preceding step as the direction of the magnetic flux passing through the lastmentioned pole pair during said preceding step.
Claim 3
Dependent Claim
16 words
A linear stepper motor according to claim 1 wherein the number of pole pairs is three.
Claim 4
Dependent Claim
25 words
A linear stepper motor according to claim 1 wherein said predetermined one of said first and second member means is said first magnetic member means.
Claim 5
Dependent Claim
25 words
A linear stepper motor according to claim 1 wherein said predetermined one of said first and second member means is said second magnetic member means.
Claim 6
Dependent Claim
23 words
A linear stepper motor according to claim 1 wherein said series connected first windings and said series connected second windings are oppositely poled.
Claim 7
Dependent Claim
19 words
A linear stepper motor according to claim 1 wherein the first and second windings of each pole are bifilar.
Claim 8
Dependent Claim
391 words
A linear stepper motor having a predetermined reference axis and being of the variable reluctance type, said motor comprising: a first magnetic laminated member having first and second surfaces disposed on first and second opposite sides, respectively, of said reference axis, said first member having a predetermined variable reluctance characteristic at said first and second surfaces, a second magnetic member having an odd plural number of pole pairs of electromagnetic poles with respective pole faces, the pole face of one pole of each said pole pair being disposed on said first side of said reference axis in juxtaposition with said first surface, the pole face of the other pole of each said pole pair being disposed on said second side of said reference axis in juxtaposition to said second surface, said second member having first and second spaced laminated sub-members disposed on said first and second opposite sides, respectively, of said reference axis, said first member being disposed between said first and second sub-members, a support assembly for supporting said first and second members, said assembly including biasing means for providing relative movement along said axis between said first and second members, each of said poles having first and second windings associated therewith, the said first windings of the poles of each particular pole pair being electrically interconnected in series aiding relationship, the second windings of the poles of each particular pole pair being electrically interconnected in series aiding relationship, and means for selectively energizing in respective predetermined stepping sequences said series connected first and second windings for single phase, double phase and alternate single phase and double phase energizing operational modes to provide relative movement between said first and second member means, said selective energizing means being operative during each one of said operational modes to energize said series connected first windings of each particular pole pair in a direction opposite to the direction of energization of the series connected second windings of that particular pole pair, and said selective energizing means during each successive step being operative to energize the series connected windings selected during each successive step to provide a magnetic flux in the same direction through the pole pair associated with the series connected windings selected in the preceding step as the direction of the magnetic flux passing through the lastmentioned pole pair during said preceding step.
Claim 9
Dependent Claim
391 words
A linear stepper motor having a predetermined reference axis and being of the variable reluctance type, said motor comprising: a first magnetic laminated member having first and second surfaces disposed on first and second opposite sides, respectively, of said reference axis, said first member having a predetermined variable reluctance characteristic at said first and second surfaces, a second magnetic member having an odd plural number of pole pairs of electromagnetic poles with respective pole faces, the pole face of one pole of each said pole pair being disposed on said first side of said reference axis in juxtaposition with said first surface, the pole face of the other pole of each said pole pair being disposed on said second side of said reference axis in juxtaposition to said second surface, said second member having first and second spaced laminated sub-members disposed on said first and second opposite sides, respectively, of said reference axis, said first member being disposed between said first and second sub-members, a support assembly for supporting said first and second members, said assembly including biasing means for providing relative movement along said axis between said first and second members, each of said poles having first and second windings associated therewith, the said first windings of the poles of each particular pole pair being electrically interconnected in series aiding relationship, the second windings of the poles of each particular pole pair being electrically interconnected in series aiding relationship, and means for selectively energizing in respective predetermined stepping sequences said series connected first and second windings for single phase, double phase and alternate single phase and double phase energizing operational modes to provide relative movement between said first and second member means, said selective energizing means being operative during each one of said operational modes to energize said series connected first windings of each particular pole pair in a direction opposite to the direction of energization of the series connected second windings of that particular pole pair, and said selective energizing means during each successive step being operative to energize the series connected windings selected during each successive step to provide a magnetic flux in the same direction through the pole pair associated with the series connected windings selected in the preceding step as the direction of the magnetic flux passing through the lastmentioned pole pair during said preceding step.
Claim 10
Dependent Claim
62 words
A linear stepper motor according to claim 7 wherein saiD support assembly further comprises: first and second side frames, said first and second sub-members being removably mounted between said side frames, and plural spacer members removably mounted between said side frames to provide a predetermined spatial relationship between said side frames proportional to the size of said magnetic first and second members.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |