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US5233248A
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Heat resistant and explosion-proof type permanent magnetic synchronous motor
Assignee: Mitsubishi Electric Corp
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Filing: 1992-05-19
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Granted: 1993-08-03
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Expires: 2012-05-19
Abstract
Abstract A heat resistant and explosion-proof permanent magnetic synchronous motor having a stator which includes an armature iron core made by piling up steel plates with surface covered with a mineral insulation material and disposed on an inner peripheral surface of a pressure case, an armature coil made by winding a wire covered with a mineral insulation material around a slot of the armature iron core, a can hermetically sealing the armature iron core, a back-up sleeve supporting the can at a portion where the armature iron core is not provided, and a slot piece of a mineral insulation material supporting the can at an opening portion of the slot. The motor also includes a rotor including a magnetic yoke connected to an outer peripheral surface of an actuating shaft provided to penetrate the pressure case and rotatably supported thereon, a plurality of rotor magnetic poles disposed on an outer peripheral surface of the magnetic yoke, and a non-metallic case covering an outer peripheral surface of the rotor magnetic pole.
Inventors
- 👤 Mitsuhiro Kawamura
- 👤 Wataru Bitoh
- 👤 Akira Yamada
- 👤 Syo Imayoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:24
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/272; H02K1/274; H02K1/2753; H02K1/278; H02K1/12; H02K1/18; H02K1/185; H02K3/00; H02K3/32; H02K3/46; H02K3/48; H02K3/487; H02K5/00; H02K5/04; H02K5/12; H02K5/128; H02K5/136; H02K9/00; H02K9/22; H02K9/227; H02K2201/00; H02K2201/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
190 words
A heat resistant and explosion-proof type permanent magnetic synchronous motor comprising: a stator including an armature iron core made by piling up steel plates with surfaces covered with a mineral insulation material and disposed on an inner peripheral surface of a pressure case, an armature coil made by winding a wire covered with a mineral insulation material around a slot of the armature iron core, a can hermetically sealing the armature iron core, a back-up sleeve supporting the can at a portion where the armature iron core is not provided, and a slot piece of a mineral insulation material supporting the can at an opening portion of the slot; and a rotor including a magnetic yoke connected to an outer peripheral surface of an actuating shaft provided to penetrate the pressure case and rotatably supported on the pressure case, a plurality of rotor magnetic poles disposed on an outer peripheral surface of the magnetic yoke, a plurality of non-magnetic spacers respectively interposed between respective circumferentially neighboring rotor magnetic poles, and a case covering an outer peripheral surface of the rotor magnetic pole thereby suppressing deterioration of said outer peripheral surface.
Claim 2
Dependent Claim
190 words
A heat resistant and explosion-proof type permanent magnetic synchronous motor comprising: a stator including an armature iron core made by piling up steel plates with surfaces covered with a mineral insulation material and disposed on an inner peripheral surface of a pressure case, an armature coil made by winding a wire covered with a mineral insulation material around a slot of the armature iron core, a can hermetically sealing the armature iron core, a back-up sleeve supporting the can at a portion where the armature iron core is not provided, and a slot piece of a mineral insulation material supporting the can at an opening portion of the slot; and a rotor including a magnetic yoke connected to an outer peripheral surface of an actuating shaft provided to penetrate the pressure case and rotatably supported on the pressure case, a plurality of rotor magnetic poles disposed on an outer peripheral surface of the magnetic yoke, a plurality of non-magnetic spacers respectively interposed between respective circumferentially neighboring rotor magnetic poles, and a case covering an outer peripheral surface of the rotor magnetic pole thereby suppressing deterioration of said outer peripheral surface.
Claim 3
Dependent Claim
44 words
The heat resistant and explosion-proof type permanent magnetic synchronous motor in accordance with claim 1 in which the rotor magnetic poles disposed on the outer peripheral surface of the magnetic yoke are disposed so as to offset with each other in a circumferential direction.
Claim 4
Dependent Claim
35 words
The heat resistant and explosion-proof type permanent magnetic synchronous motor in accordance with claim 1 in which, the armature iron core is made of pure steel plates with surfaces covered by ceramics through melt injection.
Claim 5
Dependent Claim
74 words
The heat resistant and explosion-proof type permanent magnetic synchronous motor in accordance with claim 1 in which a plurality of rotor magnetic poles of the same configuration are arranged on an outer peripheral surface of the magnetic yoke in a plurality of rows in an axial direction, and a center ring is interposed at a portion of the armature iron core which corresponds to an intermediate portion of each of the plurality of rows.
Claim 6
Dependent Claim
45 words
The heat resistant and explosion-proof type permanent magnetic synchronous motor in accordance with claim 1 in which a portion holding the armature iron core in the pressure case is made of materials having substantially the same coefficient of linear expansion as the armature iron core.
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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) | 1996-08-02 | 1997-02-01 | 1997-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-02 | 2001-02-01 | 2001-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-02 | 2005-02-01 | 2005-08-03 | $7700.00 | Window Closed / Lapsed |