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US 6,144,126 AGranted
Magnetic disc driving apparatus
AssigneeVictor Company of Japan, Ltd.
InventorMitsuo Kodama
Life of this patent
Estimating the term…
Abstract
The driving ring magnet 2 of 4 n magnetic poles is allocated on the rotor 1. 3 m flat coils 5 are allocated on the stator 3 with surrounding the FG (Frequency Generator) pattern 4. Each flat coil 5 is allocated in the distance of (5/3).pi. of the electrical angle with being adjacent to each other. The magnetic sensor 6 is allocated in the area 20 of the maximum spacing area between the flat coils 5.
Claims7
A magnetic disc driving apparatus comprising:
- an FG (Frequency Generator) pattern being annulately formed on a substrate constituting a stator with surrounding a spindle;
- 3 m flat coils being allocated in a circumference in a pitch of (5/3).pi. of the electrical angle each other, where m is an integer of more than 2;
- and
- a driving ring magnet having 4 n magnetic poles, which is allocated on a rotor with facing toward said flat coils, where n is an integer of more than 3,
- said magnetic disc driving apparatus further characterized by that a magnetic sensor is allocated in a maximum spacing area provided in between said 3 m flat coils allocated in a circumference.
2 more elements
A magnetic disc driving apparatus comprising:
- a printed circuit board;
- a spindle retained on said printed circuit board so as to rotate freely;
- a driving ring magnet having 4 n driving magnetic poles in the circumference direction, where n is an integer of more than 3, wherein said driving ring magnet is fixed to said spindle;
- a rotor of driving a magnetic disc to rotate in conjunction with rotation of said driving ring magnet;
- a magnetic head provided within a predetermined moving area with approaching said magnetic disc;
- a driving coil of 3-phase Y connection or Y network composed of 3 m flat coils, where m is an integer of more than 2, facing toward said driving magnetic pole, which is annulately allocated in a doughnut shaped area having an inner radius of R1 and an outer radius of R2 in coaxial with a center axis of rotation of said spindle;
- and
- driving circuit means for switching over said driving coil and for making driving current flow through said driving coil so as to generate revolving magnetic field,
- said magnetic disc driving apparatus makes said rotor generate revolving driving force by an interaction between said revolving magnetic field and said driving magnetic pole, and
- said magnetic disc driving apparatus is further characterized by that said flat coils are allocated so as to generate magnetic field of a same polarity for neighboring flat coils under a condition of flowing driving current through arbitrary 2 phases out of 3 phases, and by that said flat coils are allocated by such a manner that radial axes of said flat coils are directed to out side of a maximum spacing area ranging from 10 degrees to 60 degrees in a direction of the moving area of said magnetic head.
7 more elements
Dependencies are inferred from the claim text.