Patent US3798757A successfully refreshed from Google Patents.
US3798757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic alignment method for electric machine
Assignee: Robbins and Myers Inc
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Filing: 1971-07-29
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Granted: 1974-03-26
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Expires: 1991-07-29
Abstract
Abstract Apparatus for accurately magnetically centering a movable member within an annular stator of an electric machine, such as an electric motor or generator or solenoid or the like so that the lateral spacing between the movable member and the stator is magnetically equal at all portions thereof. In one embodiment of the invention, as a rotor within a stator is rotated by energization of the stator, force sensor elements sense the forces which occur laterally between the stator and the rotor. The rotor and the stator are relatively laterally adjusted until the lateral forces between the rotor and the stator are substantially zero. When such lateral forces are substantially zero, the rotor is accurately magnetically positioned with the stator.
Inventors
- 👤 T Hennessey
- 👤 C Lawton
- 👤 L Buechler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:24
CPC Classifications
H; H02; H02K; H02K15/00; H02K15/16; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/53; Y10T29/53039; Y10T29/53061; Y10T29/53083; Y10T29/5313; Y10T29/53143; Y10T29/53196; Y10T29/53909; Y10T29/53913
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
173 words
The method of magnetically centering a movable member within an annular stator member, in which both members are elements of electrical apparatus in which the movable member is normally movable within the annular stator member as a result of a magnetic field established within the apparatus, comprising: positioning the movable member within the annular stator member, applying electrical energy to one of the members causing forces to be created substantially at right angles to the axis of normal movement of the movable member when the movable member and the stator member do not have the same magnetic center, sensing forces exerted by at least one of the members which are substantially at right angles to the axis of normal movement of the movable member, moving at least one of the members in a direction which is substantially at right angles to the axis of normal movement of the movable member to reduce to a minimum the forces which are substantially at right angles to the axis of normal movement of the movable member.
Claim 2
Independent Claim
173 words
The method of magnetically centering a movable member within an annular stator member, in which both members are elements of electrical apparatus in which the movable member is normally movable within the annular stator member as a result of a magnetic field established within the apparatus, comprising: positioning the movable member within the annular stator member, applying electrical energy to one of the members causing forces to be created substantially at right angles to the axis of normal movement of the movable member when the movable member and the stator member do not have the same magnetic center, sensing forces exerted by at least one of the members which are substantially at right angles to the axis of normal movement of the movable member, moving at least one of the members in a direction which is substantially at right angles to the axis of normal movement of the movable member to reduce to a minimum the forces which are substantially at right angles to the axis of normal movement of the movable member.
Claim 3
Dependent Claim
15 words
The method of claim 1 in which electrical energy is applied to the stator member.
Claim 4
Dependent Claim
26 words
The method of claim 1 in which the movable member is moved in a direction which is substantially normal to the axis of normal movement thereof.
Claim 5
Dependent Claim
17 words
The method of claim 1 in which forces which are exerted by the stator member are sensed.
Claim 6
Dependent Claim
22 words
The method of claim 4 in which forces which are exerted by a plurality of portions of the stator member are sensed.
Claim 7
Dependent Claim
47 words
The method of claim 1 in which the voltage of the electrical energy is applied alternatingly at a lesser magnitude and then at a greater magnitude so that the forces sensed also alternatingly change when the movable member is not magnetically centered within the annular stator member.
Claim 8
Dependent Claim
44 words
The method of claim 1 in which the movable member moves in its normal manner of movement under the influence of the applied electrical energy as the forces are sensed which are substantially normal to the axis of normal movement of the movable member.
Claim 9
Independent Claim
94 words
The method of magnetically centering a rotor member of an electrical machine within an annular stator member thereof, comprising: positioning the rotor member within the stator member, applying electrical energy to the stator member causing forces to be created substantially at right angles to the axis of normal movement of the rotor member when the rotor member and the stator member do not have the same magnetic center, sensing the lateral forces exerted by one of the members, relatively positioning the members to reduce to a minimum the lateral forces existing between the members.
Claim 10
Independent Claim
94 words
The method of magnetically centering a rotor member of an electrical machine within an annular stator member thereof, comprising: positioning the rotor member within the stator member, applying electrical energy to the stator member causing forces to be created substantially at right angles to the axis of normal movement of the rotor member when the rotor member and the stator member do not have the same magnetic center, sensing the lateral forces exerted by one of the members, relatively positioning the members to reduce to a minimum the lateral forces existing between the members.
Claim 11
Dependent Claim
18 words
The method of claim 8 in which the lateral forces which are exerted by the stator are sensed.
Claim 12
Independent Claim
102 words
A method of assembling an electrical machine which has a rotor and an annular stator, comprising the steps of: positioning the rotor within the stator, applying electrical energy to the stator causing forces to be created substantially at right angles to the axis of normal movement of the rotor when the rotor and the stator do not have the same magnetic center, sensing the lateral magnetic forces exerted between the stator and the rotor, relatively positioning the rotor and stator for minimizing the lateral magnetic forces, securing the relative positions of the rotor and stator after the lateral magnetic forces are minimized.
Claim 13
Independent Claim
102 words
A method of assembling an electrical machine which has a rotor and an annular stator, comprising the steps of: positioning the rotor within the stator, applying electrical energy to the stator causing forces to be created substantially at right angles to the axis of normal movement of the rotor when the rotor and the stator do not have the same magnetic center, sensing the lateral magnetic forces exerted between the stator and the rotor, relatively positioning the rotor and stator for minimizing the lateral magnetic forces, securing the relative positions of the rotor and stator after the lateral magnetic forces are minimized.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |