Claims
- 1. A flexible disk drive motor comprising:
- a frequency generation magnet disposed on a magnet set side face of a flange portion provided, on a rotor frame outer periphery, substantially perpendicularly to a shaft, wherein said flange portion comprises:
- a plurality of hole portions which are chamfered on a side face of said flange portion opposite said magnet set side face; and
- a stepped portion, on said flange portion outer periphery end face, such that said magnet set side face protrudes with respect to said opposite side face, said frequency generation magnet being integrally molded with said hole portions and said stepped portion so that said stepped portion is embraced by said frequency generation magnet from an outer periphery thereof.
- 2. A flexible disk drive motor comprising:
- a frequency generation magnet disposed on a magnet set side face of a flange portion provided, on a rotor frame outer periphery, substantially perpendicularly to a shaft, wherein said rotor comprises:
- a plurality of hole portions each of which has a chamfer on a side face opposite said magnet set side face of said flange portion; and
- a stepped portion, on an outer periphery end face of said flange portion, such that said magnet set side face protrudes with respect to said opposite side face, wherein said frequency generation magnet is integrally molded with said hole portions and said stepped portion so that said stepped portion is embraced by said frequency generation magnet from an outer periphery thereof.
- 3. A flexible disk drive motor comprising:
- a shaft;
- a rotor frame surrounding said shaft;
- a flange portion extending about an outer periphery of said rotor frame, said flange portion being substantially perpendicular to said shaft and having a first side face and a second side face opposite said first side face, wherein said flange portion includes a plurality of apertures formed therein extending from said first face to said second face, an end of said apertures adjacent said first face being chamfered, and wherein said second face extends radially outwardly further than said first face so as to define a step on an outer peripheral edge of said flange portion; and
- a frequency generation magnet molded onto said second face so as to fill said apertures and to extend over said outer peripheral edge of said flange portion so as to encompass said step.
Priority Claims (6)
Number |
Date |
Country |
Kind |
4-30050 |
May 1992 |
JPX |
|
4-30051 |
May 1992 |
JPX |
|
4-115685 |
May 1992 |
JPX |
|
5-1560 |
Jan 1993 |
JPX |
|
5-2143 |
Jan 1993 |
JPX |
|
5-14027 |
Jan 1993 |
JPX |
|
Parent Case Info
This is a division of application Ser. No. 08/057,486, filed May 6, 1993.
US Referenced Citations (10)
Foreign Referenced Citations (1)
Number |
Date |
Country |
61-52350 |
Apr 1986 |
JPX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
57486 |
May 1993 |
|