KR20130069015A - Stator core of spindle motor - Google Patents
Stator core of spindle motor Download PDFInfo
- Publication number
- KR20130069015A KR20130069015A KR1020110136524A KR20110136524A KR20130069015A KR 20130069015 A KR20130069015 A KR 20130069015A KR 1020110136524 A KR1020110136524 A KR 1020110136524A KR 20110136524 A KR20110136524 A KR 20110136524A KR 20130069015 A KR20130069015 A KR 20130069015A
- Authority
- KR
- South Korea
- Prior art keywords
- stator core
- coil
- tooth
- present
- spindle motor
- Prior art date
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Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/20—Driving; Starting; Stopping; Control thereof
- G11B19/2009—Turntables, hubs and motors for disk drives; Mounting of motors in the drive
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/14—Stator cores with salient poles
- H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/28—Layout of windings or of connections between windings
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The present invention relates to a stator core for a spindle motor, comprising: a core bag having a through hole at the center thereof and having an annular shape; It consists of a plurality of teeth protruding radially outward from the core back, providing a space for winding the coil.
In particular, the tees of the stator core according to the present invention are characterized by having a circular or regular polygonal cross section. The coil is wound around a tooth with a circular or regular polygonal cross section so that it is wound close to the circle.
Description
The present invention relates to a stator core for a spindle motor.
Typically, a spindle motor is mounted inside a hard disk drive (HDD) to rotate a disk of an HDD that is recording and storing information.
Spindle motors generally consist of a rotor and a stator, which have a shaft in the center of the rotor case and arrange magnets along the rotor case edge. The stator seats the stator core on the base, with the stator core having a through hole in the center winding the coil around a tooth projecting radially. When a current is applied to the coil, a magnetic field is generated around the tip of the stator core. The magnetic field provides a magnetic force to the magnet provided in the rotor, which then rotates the rotor to drive the spindle motor.
As described above, an example of a spindle motor according to the prior art is disclosed in Patent Document 1.
The stator core according to the prior art has twelve radially extending stator poles and teeth at the tip of the stator poles protruding circumferentially, as is already well known to those skilled in the art.
In the stator core of this structure, a coil is wound around the stator pole. In particular, the stator pole consists of a plate-shaped member having a rectangular cross section. The spindle motor forms a stator core by loading a plurality of plate-shaped members as necessary. The spindle motor has a rectangular or rectangular cross section as it is loaded.
Stator poles arranged in a rectangular cross section will wind the coils around them. Coils wound over stator poles with a rectangular cross section will have to be wound in a generally rectangular shape.
Therefore, a coil wound in a rectangular shape may not guarantee a uniform magnetic flux flow for a coil arranged in a rectangular shape when an electric current is applied from the outside, causing an imbalance of magnetic flux density.
The present invention has been made to solve the above-mentioned disadvantages, and aims to improve the magnetic flux density to be generated in the stator core of a motor for a hard disk drive.
The present invention allows the coil to be wound round or close to a circle around the tooth to produce a uniform flux density.
To this end, the present invention,
A core bag having a through hole at the center thereof and having an annular shape;
A plurality of teeth projecting radially outwardly from the coreback to provide space for winding the coil; And
Opposite portion is disposed opposite the magnet of the rotor at the end of the tooth; in particular, the tooth according to the invention is characterized in that it has an n-shaped cross section. Here, the n-square has n as the number of sides, and the larger the number of n, the closer to the circle.
In addition, the outer peripheral surface of the opposing part is formed in an arc shape so that the stator core of the present invention opposes close to the magnet of the rotor arranged in a ring shape.
That is, the present invention consists of a tooth consisting of a regular polygonal cross section. Since the regular polygonal teeth have the same side lengths and the same angles, the coils to be wound can be stably seated on the teeth as well as wound close to the circle.
The present invention is designed to have the number of sides larger than 4 so as to wind the coil close to a circle unlike a stator coil having a rectangular cross section.
Preferably, the teeth of the stator nose according to the invention are to have a circular cross section.
Prior to that, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may properly define the concept of the term in order to best explain its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.
According to the description of the present invention, the present invention is provided so that the coil can be wound around the tooth of the stator core in a circle or a regular polygon close to the circle.
The present invention is to ensure a uniform magnetic flux density by generating a magnetic flux flow radially by winding the coil in a regular polygonal shape close to the circular or circular.
Through this, the present invention can improve the electromagnetic properties of the motor by improving the focusing speed of the magnetic flux. The electromagnetic characteristics of the motor improve the noise as well as the vibration of the motor and provide more stable operation performance.
1 is a schematic cross-sectional view of a spindle motor.
2 is a plan view of a stator core according to the present invention.
3A is a cross-sectional view showing an example of the stator core shown in FIG. 2.
3B is a cross-sectional view showing another example of the stator core shown in FIG. 2.
3C is a cross-sectional view illustrating still another example of the stator core shown in FIG. 2.
4 is a cross-sectional view of a coil wound on the stator core and its outer circumferential surface of the present invention shown in FIG. 3A.
Now, a stator core of a motor for a hard disk drive, preferably a spindle motor, according to the present invention will be described in detail with reference to the accompanying drawings.
Advantages, features, and methods of achieving the present invention will be apparent from the embodiments described below in conjunction with the accompanying drawings. In the present specification, in adding the reference numerals to the components of each drawing, the same reference numerals refer to the same or similar components throughout the specification. In addition, when the detailed description of the related art related to the present specification makes the gist of the present invention unclear, the detailed description is omitted.
1 is a schematic cross-sectional view of a spindle motor according to an embodiment of the present invention.
Referring to FIG. 1, the
The
In addition, the
The
The
The
In other words, the
In addition, the
The
The
2 is a plan view of a stator core according to the present invention.
The present invention relates to a
As shown, the
The
The
The
The opposed portion 151c is formed at the end of the
When a current is applied to the coil 152 (refer to FIG. 4) wound around the
The outer circumferential surface of the opposing portion 151c has an arc shape, and can be opposed to each other at a predetermined gap without being in direct contact with the magnets of the rotor arranged in a circular shape.
FIG. 3 shows a cross-sectional view of various examples of a stator core according to the present invention cut along the III-III line shown in FIG. 2.
The stator core according to one embodiment of the present invention has a
The stator core according to another embodiment of the present invention includes a
The stator core according to another example of the present invention includes a
The stator core according to the present invention is not limited to the
In particular, the present invention consists of a
Here, the term regular polygon refers to a polygon in which all sides have the same length and all angles have the same size, and a regular polygon having a number of sides n is called a regular n polygon.
Since the present invention has to wind the wound state of the coil around the
4 is a cross-sectional view of the stator core of the present invention wound with a coil.
As shown in Figs. 3a to 3c, the stator core according to the invention consists of a
Referring to FIG. 4, the
Since the
Although the embodiments of the present invention have been described above with reference to the accompanying drawings, this is for describing the present invention in detail, and the stator core according to the present invention is not limited thereto and is within the scope and / or scope of the appended claims. In the above, it will be apparent that modifications or changes are possible by those skilled in the art.
100: spindle motor, 110: base,
120: sleeve, 130: shaft,
140: rotor, 150: stator,
151: core, 152: coil.
Claims (6)
In the stator core consisting of a plurality of teeth protruding radially outward from the core back to provide a space for winding the coil,
The tees have an n-shaped cross section, where n represents the number of sides,
The coil of the stator core, characterized in that the coil is wound around the tooth round.
The tooth is a stator core for a spindle motor, characterized in that the length of the sides and the size of the angle is made of the same regular polygon.
The stator core is a stator core for a spindle motor, characterized in that consisting of a regular polygon having a number n of more than four.
And said tooth has a circular cross section.
And an opposite portion disposed opposite the magnet of the rotor at the end of the tooth.
The outer circumferential surface of the opposing portion of the opposing portion is formed in an arc shape, the stator core for the spindle motor.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020110136524A KR20130069015A (en) | 2011-12-16 | 2011-12-16 | Stator core of spindle motor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020110136524A KR20130069015A (en) | 2011-12-16 | 2011-12-16 | Stator core of spindle motor |
Publications (1)
Publication Number | Publication Date |
---|---|
KR20130069015A true KR20130069015A (en) | 2013-06-26 |
Family
ID=48864515
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1020110136524A KR20130069015A (en) | 2011-12-16 | 2011-12-16 | Stator core of spindle motor |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR20130069015A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20220023627A (en) | 2020-08-21 | 2022-03-02 | 경일대학교산학협력단 | sphere-shaped robot |
-
2011
- 2011-12-16 KR KR1020110136524A patent/KR20130069015A/en not_active Application Discontinuation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20220023627A (en) | 2020-08-21 | 2022-03-02 | 경일대학교산학협력단 | sphere-shaped robot |
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