US3590353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronically commutated motor having an outside rotor and an inside position detector
Assignee: Panasonic Holdings Corp
•
Filing: 1969-07-09
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Granted: 1971-06-29
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Expires: 1989-07-09
Abstract
Abstract An electronically commutated motor having a multiple pole permanent magnet rotor. A position detecting means is located inside of the stator. This arrangement makes it easy to fabricate the stator and the position detecting means from the same sheet of laminated magnetic material with little material loss. A position detecting rotor having a plurality of teeth with shortcircuited conductors thereon modulates the coupling between the primary and secondary windings in the position detecting windings during its rotation without disturbing the regular coupling of each pair of windings.
Inventors
- 👤 Kazutsugu Kobayashi
- 👤 Hisayuki Matsumoto
- 👤 Yoshiaki Igarashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:27
CPC Classifications
H; H02; H02K; H02K29/00; H02K29/06; H02K29/12; H02K24/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
164 words
An electronically commutated motor comprising a rotor having a multiple pole permanent magnet; a stator having a set of stator windings and being positioned within the inner periphery of said rotor, said rotor being rotatable to rotate around the outside of said stator; a position detecting means having a position detecting stator and a position detecting rotor, said position detecting stator being positioned within the internal periphery of said stator and said position detecting rotor having a plurality of teeth and being rotatable inside of the position detecting stator and with said rotor, said position detecting means further having signal producing means producing a set of position signals under the influence of said teeth for indicating the relative rotational position of said stator and said rotor; and a current control means coupled to said signal producing means which is controlled by said position signals from said position detecting means and coupled to said stator windings for controlling the current flowing through said stator windings.
Claim 2
Dependent Claim
164 words
An electronically commutated motor comprising a rotor having a multiple pole permanent magnet; a stator having a set of stator windings and being positioned within the inner periphery of said rotor, said rotor being rotatable to rotate around the outside of said stator; a position detecting means having a position detecting stator and a position detecting rotor, said position detecting stator being positioned within the internal periphery of said stator and said position detecting rotor having a plurality of teeth and being rotatable inside of the position detecting stator and with said rotor, said position detecting means further having signal producing means producing a set of position signals under the influence of said teeth for indicating the relative rotational position of said stator and said rotor; and a current control means coupled to said signal producing means which is controlled by said position signals from said position detecting means and coupled to said stator windings for controlling the current flowing through said stator windings.
Claim 3
Dependent Claim
38 words
An electronically commutated motor as claimed in claim 1 in which said position detecting stator includes plurality of sets of primary and secondary windings and said position detecting rotor modulates the coupling between said primary and secondary windings.
Claim 4
Dependent Claim
34 words
An electronically commutated motor as claimed in claim 2 in which said position detecting rotor has short circuited conductors on each tooth interlinking the path of magnetic flux from one tooth to another tooth.
Claim 5
Dependent Claim
20 words
An electronically commutated motor in accordance with claim 1 wherein said position detecting rotor is made of laminated magnetic material.
Claim 6
Dependent Claim
54 words
An electronically communicated motor in accordance with claim 1 wherein said permanent magnet has 2n poles, said stator windings are arranged in m phases, said position detecting rotor has n teeth, and said signal producing means comprises m pairs of position detecting windings positioned every 360/m*/m* around the inside of said position detecting stator.
References Cited (Backward Citations)
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US3284687A
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US3305717A
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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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |