US4935656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High speed motor/generator for turbocharger
Assignee: Isuzu Motors Ltd
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Filing: 1989-10-24
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Granted: 1990-06-19
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Expires: 2009-10-24
Abstract
Abstract A high-speed motor/generator drivable by a turbine includes a rotor mounted on the shaft of the turbine. Since the magnetic flux produced by the magnet of the rotor vary at a high frequency, a ferrite core of good high frequency characteristics is employed as a stator core confronting the rotor to reduce a high-frequency loss. To improve the flux density and magnetic permeability of the ferrite core (which one poorer than those of a core of silicon steel plates), the magnet of the rotor has a number of magnetic poles to increase the frequency at which the magnetic flux is varied, so that the electromotive force produced is increased.
Inventors
- 👤 Hideo Kawamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:06
CPC Classifications
H; H02; H02K; H02K17/00; F; F02; F02B; F02B37/00; F02B37/005; F01; F01D; F01D15/00; F01D15/10; F02B37/04; F02B37/10; F02B39/00; F02B39/02; F02B39/08; F02B39/10; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2706; H02K1/272; H02K1/2726; H02K1/2733; H02K21/00; H02K21/12; H02K21/14; H02K7/00; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
75 words
A high-speed motor/generator drivable by a turbine having a shaft, comprising: an annular rotor comprising a permanent magnet mounted on a shaft of the turbine and having at least three pairs of magnetic poles, each pair of the magnetic poles being disposed side by side and extending radially from the shaft; a stator core comprising a ferrite core disposed along an outer periphery of said rotor; and a stator winding disposed around said stator core.
Claim 2
Dependent Claim
75 words
A high-speed motor/generator drivable by a turbine having a shaft, comprising: an annular rotor comprising a permanent magnet mounted on a shaft of the turbine and having at least three pairs of magnetic poles, each pair of the magnetic poles being disposed side by side and extending radially from the shaft; a stator core comprising a ferrite core disposed along an outer periphery of said rotor; and a stator winding disposed around said stator core.
Claim 3
Dependent Claim
30 words
A high-speed motor/generator according to claim 1, wherein said rotor further comprises a reinforcing pipe fitted over an outer periphery of said permanent magnet and made of a thin material.
Claim 4
Dependent Claim
26 words
A high-speed motor/generator according to claim 2, wherein said reinforcing pipe is selected from the group consisting of titanium alloy, partially stabilized zirconium or stainless steel.
Claim 5
Dependent Claim
16 words
A high-speed motor/generator according to claim 3, wherein said stator winding comprises a three-phase AC winding.
Claim 6
Dependent Claim
16 words
A high-speed motor/generator according to claim 1, wherein said stator winding comprises a three-phase AC winding.
Claim 7
Dependent Claim
96 words
A turbocharger for an engine, comprising: a compressor impeller; a turbine impeller; a rotatable shaft coupled to said compressor impeller and said turbine impeller; a cylindrical rotor comprising a permanent magnet mounted on said rotatable shaft, said rotor having three pairs of magnetic poles, each pair of the magnetic poles being disposed side by side and extending radially from said shaft; a stator core comprising a ferrite core positioned about the periphery of said rotor; and a stator winding positioned about said stator core, said rotor, said stator core, and said stator winding forming a motor/generator.
Claim 8
Dependent Claim
96 words
A turbocharger for an engine, comprising: a compressor impeller; a turbine impeller; a rotatable shaft coupled to said compressor impeller and said turbine impeller; a cylindrical rotor comprising a permanent magnet mounted on said rotatable shaft, said rotor having three pairs of magnetic poles, each pair of the magnetic poles being disposed side by side and extending radially from said shaft; a stator core comprising a ferrite core positioned about the periphery of said rotor; and a stator winding positioned about said stator core, said rotor, said stator core, and said stator winding forming a motor/generator.
Claim 9
Dependent Claim
19 words
A turbocharger according to claim 6, further comprising a reinforcing plate force-fitted over the outer periphery of said rotor.
Claim 10
Dependent Claim
26 words
A turbocharger according to claim 7, wherein said reinforcing plate is selected from the group consisting of a titanium alloy, partially stabilized zirconium, and stainless steel.
Claim 11
Dependent Claim
18 words
A turbocharger according to claim 7, wherein said rotor comprises a permanent magnet containing a rare earth element.
Claim 12
Dependent Claim
15 words
A turbocharger according to claim 9, wherein said stator winding comprises a three-phase AC winding.
Claim 13
Dependent Claim
18 words
A turbocharger according to claim 8, wherein said rotor comprises a permanent magnet containing a rare earth element.
Claim 14
Dependent Claim
15 words
A turbocharger according to claim 11, wherein said stator winding comprises a three-phase AC winding.
References Cited (Backward Citations)
FR822291A
Cited
US4253031A
Cited
US4223263A
Cited
US4445061A
Cited
JPS586925A
Cited
EP0079100A1
Cited
JPS59101540A
Cited
US4625135A
Cited
US4769993A
Cited
US4638200A
Cited
US4605874A
Cited
US4827170A
Cited
US4878347A
Cited
US4850820A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-18 | 1993-12-18 | 1994-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-18 | 1997-12-18 | 1998-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-18 | 2001-12-18 | 2002-06-19 | $7700.00 | Window Closed / Lapsed |