US4945296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable speed controllable induction motor
Assignee: Satake Engineering Co Ltd
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Filing: 1988-07-12
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Granted: 1990-07-31
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Expires: 2008-07-12
Abstract
Abstract A variable speed controllable induction motor comprises a single rotor formed in one-piece having different sets of rotor conductive members effective respectively at different speed ranges, that is, at least a set of first conductive members specifically effective for a lower speed range and a set of second conductive members specifically effective for a higher speed ranges; a plurality of stators disposed side by side surrounding and facing respective portions of said rotor; and a phase shifting apparatus for producing phase differences on the respective portions of the rotor conductive members. The motor can achieve an overall wide range speed control due to the combined effects of the characteristics obtained respectively from the different set of the rotor conductive members.
Inventors
- 👤 Toshihiko Satake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:20
CPC Classifications
H; H02; H02K; H02K17/00; H02K17/02; H02K17/34; H02K17/36; H02K16/00; H02K16/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
185 words
A variable speed controllable induction motor comprising: a single rotor formed in one-piece having a plurality of rotor cores axially mounted on a common axis with a non-magnetic portion being provided between said rotor cores and having, on said rotor cores, a plurality of sets of rotor conductive members including first group conductive members effective specifically for a low speed range and a second group conductive members effective specifically for a high speed range, at least said first group conductive members being short-circuited at said non-magnetic portion by resisting members and each set of said rotor conductive members being respectively connected linearly; a plurality of stators disposed side by side and surrounding and facing said respective rotor cores; and phase shifting means for producing phase differences between the voltage induced on the portions of said rotor conductive members which face one of said plurality of stators and the voltage induced on the corresponding portions of said rotor conductive members which face the another one of said stators; whereby a rotation speed of said rotor can be varied by the controlling of said phase shifting means.
Claim 2
Dependent Claim
185 words
A variable speed controllable induction motor comprising: a single rotor formed in one-piece having a plurality of rotor cores axially mounted on a common axis with a non-magnetic portion being provided between said rotor cores and having, on said rotor cores, a plurality of sets of rotor conductive members including first group conductive members effective specifically for a low speed range and a second group conductive members effective specifically for a high speed range, at least said first group conductive members being short-circuited at said non-magnetic portion by resisting members and each set of said rotor conductive members being respectively connected linearly; a plurality of stators disposed side by side and surrounding and facing said respective rotor cores; and phase shifting means for producing phase differences between the voltage induced on the portions of said rotor conductive members which face one of said plurality of stators and the voltage induced on the corresponding portions of said rotor conductive members which face the another one of said stators; whereby a rotation speed of said rotor can be varied by the controlling of said phase shifting means.
Claim 3
Dependent Claim
37 words
A variable speed controllable induction motor according to claim 1, wherein said first group conductive members and said second group conductive members are provided respectively on the circumferences the diameters of which are different from each other.
Claim 4
Dependent Claim
31 words
A variable speed controllable induction motor according to claim 1, wherein said first group conductive members are of higher resistivity and said second group of conductive members are of lower resistivity.
Claim 5
Dependent Claim
19 words
A variable speed controllable induction motor according to claim 1, wherein said non-magnetic portion comprises a non-magnetic core portion.
Claim 6
Dependent Claim
17 words
A variable speed controllable induction motor according to claim 1, wherein said non-magnetic portion comprises an airspace.
Claim 7
Dependent Claim
193 words
A variable speed controllable induction motor comprising: a single rotor formed in one-piece having a plurality of rotor cores axially mounted on a common axis with non-magnetic portion being provided between said rotor cores and having, on said rotor cores, a plurality of sets of rotor conductive members including first group conductive members effective specifically for a low speed range and second group conductive members effective specifically for a high speed range, at least either of said first group conductive members and said second group conductive members being skewed at an angle different from that of the other of said first and second group conductive members at said non-magnetic portion; a plurality of stators disposed side by side and surrounding and facing said respective rotor cores; and phase shifting means for producing phase differences between the voltage induced on the portions of said rotor conductive members which face one of said plurality of stators and the voltage induced on the corresponding portions of said rotor conductive members which face the another one of said stators; whereby a rotation speed of said rotor can be varied by the controlling of said phase shifting means.
Claim 8
Dependent Claim
193 words
A variable speed controllable induction motor comprising: a single rotor formed in one-piece having a plurality of rotor cores axially mounted on a common axis with non-magnetic portion being provided between said rotor cores and having, on said rotor cores, a plurality of sets of rotor conductive members including first group conductive members effective specifically for a low speed range and second group conductive members effective specifically for a high speed range, at least either of said first group conductive members and said second group conductive members being skewed at an angle different from that of the other of said first and second group conductive members at said non-magnetic portion; a plurality of stators disposed side by side and surrounding and facing said respective rotor cores; and phase shifting means for producing phase differences between the voltage induced on the portions of said rotor conductive members which face one of said plurality of stators and the voltage induced on the corresponding portions of said rotor conductive members which face the another one of said stators; whereby a rotation speed of said rotor can be varied by the controlling of said phase shifting means.
Claim 9
Dependent Claim
36 words
A variable speed controllable induction motor according to claim 6, wherein said first group conductive members and said second group conductive members are provided respectively on circumferences the diameters of which are different from each other.
Claim 10
Dependent Claim
30 words
A variable speed controllable induction motor according to claim 6, wherein said first group conductive members are of higher resistivity and said second group conductive members are of lower resistivity.
Claim 11
Dependent Claim
27 words
A variable speed controllable induction motor according to claim 6, wherein at least said first group conductive members are short-circuited by resisting members at said non-magnetic portion.
Claim 12
Dependent Claim
19 words
A variable speed controllable induction motor according to claim 6, wherein said non-magnetic portion comprises a non-magnetic core portion.
Claim 13
Dependent Claim
17 words
A variable speed controllable induction motor according to claim 6, wherein said non-magnetic portion comprises an airspace.
References Cited (Backward Citations)
US1246643A
Cited
US1708909A
Cited
US3290574A
Cited
US3280400A
Cited
US3435315A
Cited
JPS4986807A
Cited
JPS5429005A
Cited
US4229689A
Cited
US4785213A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-30 | 1994-01-29 | 1994-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-30 | 1998-01-29 | 1998-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-30 | 2002-01-29 | 2002-07-31 | $7700.00 | Window Closed / Lapsed |