Patent US5383265A successfully refreshed from Google Patents.
US5383265A
Expired / Lapsed
US
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Method for fixing FG magnet
Assignee: Panasonic Holdings Corp
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Filing: 1994-03-22
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Granted: 1995-01-24
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Expires: 2014-03-22
Abstract
Abstract A method for fixing an FG magnet to a rotor frame of a motor. An FG magnet containing a plastic magnet is charged into a recessed portion provided on the outer peripheral surface of the rotor frame, whereby it is fixed thereto as it is monolithically formed to be engaged therein. In this manner, the FG magnet may be fixed to the rotor frame without exceeding the thickness of the rotor frame.
Inventors
- 👤 Hiroshi Nishizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:24
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/22; H02K1/27; H02K1/2793; H02K1/2795; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49009; Y10T29/49012; Y10T29/4902; Y10T29/49075; Y10T29/49076
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
133 words
A method for fixing an FG magnet to a rotor frame of a motor without an adhesive and in a manner that said FG magnet does not extend beyond upper and lower bounds of said rotor frame, said method comprising the steps of: providing a recessed portion shallower than a plate-tickness of said rotor frame on an outer peripheral surface of said rotor frame; and monolithically forming the FG magnet around the outer periphery of said rotor frame by applying to said outer peripheral surface a plastic magnet which will form the FG magnet, said plastic magnet being applied so that said FG magnet will not extend beyond said upper and lower bounds of said rotor frame and so that at least a portion of said plastic magnet will fill said recessed portion.
Claim 2
Independent Claim
133 words
A method for fixing an FG magnet to a rotor frame of a motor without an adhesive and in a manner that said FG magnet does not extend beyond upper and lower bounds of said rotor frame, said method comprising the steps of: providing a recessed portion shallower than a plate-tickness of said rotor frame on an outer peripheral surface of said rotor frame; and monolithically forming the FG magnet around the outer periphery of said rotor frame by applying to said outer peripheral surface a plastic magnet which will form the FG magnet, said plastic magnet being applied so that said FG magnet will not extend beyond said upper and lower bounds of said rotor frame and so that at least a portion of said plastic magnet will fill said recessed portion.
Claim 3
Dependent Claim
31 words
A method for fixing an FG magnet according to claim 1, wherein the material of the FG magnet is 60 wt% to 90 wt% strontium ferrite in terms of weight percentage.
Claim 4
Dependent Claim
27 words
A method for fixing an FG magnet according to claim 1, wherein the height of the FG magnet is less than the height of the rotor frame.
Claim 5
Dependent Claim
27 words
A method for fixing an FG magnet according to claim 1, wherein the rotor frame is a rotor frame of a motor of a floppy disk drive.
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) | 1998-01-23 | 1998-07-25 | 1999-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-23 | 2002-07-25 | 2003-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-23 | 2006-07-25 | 2007-01-24 | $7700.00 | Window Closed / Lapsed |