US4713570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetically enhanced variable reluctance motor systems
Assignee: Pacific Scientific Co
•
Filing: 1986-06-04
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Granted: 1987-12-15
•
Expires: 2006-06-04
Abstract
Abstract Electrically-energized salient stator poles of a variable reluctance motor terminate in stator teeth that oppose the rotor on a rotor surface. Permanent magnets located between adjacent stator teeth, and magnetized transverse to the stator to rotor gap, enhance the motor torque relative to the applied excitation in ampere-turns. Permanent magnets on the rotor are avoided by reversing the magnetization of the permanent magnets from pole to pole and energizing the pole windings to oppose the magnets in four phases 1 1 0 0, 0 1 1 0, 0 0 1 1, 1 0 0 1 during successive steps. In one embodiment, a linear motor utilizes the system by replacing the rotor with a linear actuator.
Inventors
- 👤 Robert Mastromattei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:10
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; H02K41/03; H02K41/031; H02K41/033; H02K21/00; H02K21/38; H02K21/44; H02K37/00; H02K37/10; H02K37/20
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
141 words
a stepping motor, comprising: a stator; a plurality of stator poles on said stator; a winding on each of said stator poles; a plurality spaced stator teeth on said stator poles, each of said stator poles having at least one tooth; a mover movable relative to said stator; said mover having a plurality of spaced mover teeth located for movement along a first direction past said stator pole teeth; a plurality of sections of permanent magnetic material on said stator poles, each of said sections being located adjacent a stator tooth and poled in a direction transverse to the first direction; each pole having at least one of said sections, the sections on each of said stator poles being poled transverse to the first direction but opposite to the direction of the poling of the sections on an adjacent stator pole.
Claim 2
Dependent Claim
141 words
a stepping motor, comprising: a stator; a plurality of stator poles on said stator; a winding on each of said stator poles; a plurality spaced stator teeth on said stator poles, each of said stator poles having at least one tooth; a mover movable relative to said stator; said mover having a plurality of spaced mover teeth located for movement along a first direction past said stator pole teeth; a plurality of sections of permanent magnetic material on said stator poles, each of said sections being located adjacent a stator tooth and poled in a direction transverse to the first direction; each pole having at least one of said sections, the sections on each of said stator poles being poled transverse to the first direction but opposite to the direction of the poling of the sections on an adjacent stator pole.
Claim 3
Dependent Claim
23 words
A motor as in claim 1, wherein each of said stator poles includes a plurality of teeth and a section between adjacent teeth.
Claim 4
Dependent Claim
12 words
A motor as in claim 1, wherein said mover is a rotor.
Claim 5
Dependent Claim
23 words
A motor as in claim 3, wherein each of said stator poles include a plurality of teeth and a section between adjacent teeth.
Claim 6
Dependent Claim
12 words
A motor as in claim 1, wherein said material is samarium cobalt.
Claim 7
Dependent Claim
13 words
A motor as in claim 1 wherein said material is a neodymium-boron alloy.
Claim 8
Dependent Claim
12 words
A motor as in claim 4, wherein said material is samarium cobalt.
Claim 9
Dependent Claim
13 words
A motor as in claim 4, wherein said material is a neodymium-boron alloy.
Claim 10
Dependent Claim
13 words
A motor as in claim 1, wherein said sections are permanent magnet inserts.
Claim 11
Dependent Claim
58 words
A motor as in claim 1, wherein the windings on adjacent stator poles are wound in opposite directions so as to make the polarity of each stator pole opposite to the polarity of the adjacent stator pole when each of said windings are excited by current in the same direction and to oppose the polarity of said sections.
Claim 12
Dependent Claim
22 words
A motor as in claim 10, wherein each of said stator poles includes a plurality of teeth and sections between adjacent teeth.
Claim 13
Dependent Claim
12 words
A motor as in claim 10, wherein said mover is a rotor.
Claim 14
Dependent Claim
22 words
A motor as in claim 12, wherein each of said stator poles includes a plurality of teeth and sections between adjacent teeth.
Claim 15
Dependent Claim
12 words
A motor as in claim 10, wherein said material is samarium cobalt.
Claim 16
Dependent Claim
13 words
A motor as in claim 10, wherein said material is a neodymium-boron alloy.
Claim 17
Dependent Claim
13 words
A motor as in claim 10, wherein said sections are permanent magnet inserts.
Claim 18
Dependent Claim
13 words
A motor as in claim 10, wherein said rotor is a linear actuator.
Claim 19
Dependent Claim
13 words
A motor as in claim 11, wherein said rotor is a linear actuator.
Claim 20
Dependent Claim
13 words
A motor as in claim 16, wherein said rotor is a linear actuator.
Claim 21
Dependent Claim
39 words
A motor as in claim 1, wherein said stator poles have surfaces facing the rotor and said stator teeth are formed by locating the sections beneath the surfaces and spacing the sections so as to form teeth between them.
Claim 22
Dependent Claim
159 words
A stepping motor system, comprising: driving means for producing pulsed voltages; a motor coupled to said driving means; and including: a stator; a plurality of stator poles on said stator; a winding on each of said stator poles; a plurality spaced stator teeth on said stator poles, each of said stator poles having at least one tooth; a mover movable relative to said stator; said mover having a plurality of spaced mover teeth located for movement along a first direction past said stator pole teeth; a plurality of sections of permanent magnetic material on each of said stator poles, each of said sections being located adjacent a stator tooth and poled in a direction transverse to the first direction; each pole having at least one of said sections, the sections on each of said stator poles being poled transverse to the first direction but opposite to the direction of the poling of the sections on an adjacent stator pole.
Claim 23
Dependent Claim
159 words
A stepping motor system, comprising: driving means for producing pulsed voltages; a motor coupled to said driving means; and including: a stator; a plurality of stator poles on said stator; a winding on each of said stator poles; a plurality spaced stator teeth on said stator poles, each of said stator poles having at least one tooth; a mover movable relative to said stator; said mover having a plurality of spaced mover teeth located for movement along a first direction past said stator pole teeth; a plurality of sections of permanent magnetic material on each of said stator poles, each of said sections being located adjacent a stator tooth and poled in a direction transverse to the first direction; each pole having at least one of said sections, the sections on each of said stator poles being poled transverse to the first direction but opposite to the direction of the poling of the sections on an adjacent stator pole.
Claim 24
Dependent Claim
44 words
A system as in claim 21, wherein said driver means is arranged to generate four phases of coded pulses to make the winding on the stator poles produce polarities in the same direction as each of said sections on each of said stator poles.
Claim 25
Dependent Claim
58 words
A system as in claim 21, wherein the windings on adjacent stator poles are wound in opposite directions so as to make the polarity of each stator pole opposite to the polarity of the adjacent stator pole when each of said windings are excited by current in the same direction and to oppose the polarity of said sections.
Claim 26
Dependent Claim
17 words
A system as in claim 23, wherein said driver means is arranged to generate the pulses unidirectionally.
Claim 27
Dependent Claim
74 words
A system as in claim 23, wherein said driver means is arranged to generate the pulses unidirectionally in four phases A, B, C, and D in steps such that for the respective phases A, B, C, and D, the pulses are 1 1 0 0 for a first step, 0 1 1 0 for a second step, 0 0 1 1 for a third step, and 1 0 0 1 for a fourth step.
Claim 28
Dependent Claim
13 words
A system as in claim 21, wherein said motor is a rotational motor.
Claim 29
Dependent Claim
13 words
A system as in claim 21, wherein said motor is a linear motor.
Claim 30
Dependent Claim
63 words
A system as in claim 21, wherein said driver means is arranged to generate a plurality of steps with four phases per step, said phases being 1 1 0 0 for the first step and 0 1 1 0, 0 0 1 1, and 1 0 0 1 for succeeding steps, where "0" is a current-off condition and "1" is a current-on condition.
Claim 31
Dependent Claim
58 words
A system as in claim 21, wherein the windings on adjacent stator poles are wound in the same direction so as to make the polarity of each stator pole opposite to the polarity of the adjacent stator pole when each of said windings are excited by current in opposite directions and to oppose the polarity of said sections.
Claim 32
Dependent Claim
58 words
A system as in claim 1, wherein the windings on adjacent stator poles are wound in the same direction so as to make the polarity of each stator pole opposite to the polarity of the adjacent stator pole when each of said windings are excited by current in opposite directions and to oppose the polarity of said sections.
Claim 33
Dependent Claim
33 words
A motor as in claim 1, wherein, the first direction is along a surface separating said mover and said stator and the sections on the stator poles are poled transverse to the surface.
Claim 34
Dependent Claim
33 words
A system as in claim 21, wherein, the first direction is along a surface separating said mover and said stator and the sections on the stator poles are poled transverse to the surface.
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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) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |