JPH0124026B2 - - Google Patents
Info
- Publication number
- JPH0124026B2 JPH0124026B2 JP56088376A JP8837681A JPH0124026B2 JP H0124026 B2 JPH0124026 B2 JP H0124026B2 JP 56088376 A JP56088376 A JP 56088376A JP 8837681 A JP8837681 A JP 8837681A JP H0124026 B2 JPH0124026 B2 JP H0124026B2
- Authority
- JP
- Japan
- Prior art keywords
- turntable
- ferrite powder
- ferrite
- molding
- magnetic field
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Rotational Drive Of Disk (AREA)
Description
【発明の詳細な説明】
本発明はダイレクトドライブ型レコードプレー
ヤなどに用いられるターンテーブルの製造方法に
関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a turntable used in a direct drive type record player or the like.
従来より実開昭52―14409号公報などにおいて、
合成樹脂にフエライト粉を混合した材料を用いて
モータの回転子を成形したものが提供されてい
る。本発明はこの技術をダイレクトドライブ型タ
ーンテーブルに応用するにあたり、高価なフエラ
イト材料をできるだけ有効に利用して磁気効率を
高めるために、ターンテーブル内のフエライト粉
を有利に分布させることのできるターンテーブル
の製造方法を提供することを目的とするものであ
る。 Previously, in Utility Model Application Publication No. 52-14409, etc.
There is a motor rotor molded from a material made of a mixture of synthetic resin and ferrite powder. In applying this technology to a direct drive turntable, the present invention proposes a turntable that can advantageously distribute ferrite powder within the turntable in order to utilize expensive ferrite materials as effectively as possible and increase magnetic efficiency. The purpose of this invention is to provide a method for manufacturing.
第１図は本発明方法によつて製造されるターン
テーブルの下面図、第２図はその断面図を示した
もので、図中１で示すターンテーブルはフエライ
ト粉を混入したプラスチツクマグネツトで成形し
たものであり、第１図に示すようなパターンで
NS交互に着磁されている。その下面には交番磁
極が周方向に現われるように複数の駆動コイル３
で構成された円盤状固定子２が対向配置され、こ
の固定子２の中心部に立設されたスピンドル５に
より、ターンテーブル１が回転自在に支持されて
いる。このようにして固定子２の回転磁界により
ターンテーブル１がデイレクトに駆動されるモー
タ５が形成されたものである。 Fig. 1 is a bottom view of a turntable manufactured by the method of the present invention, and Fig. 2 is a cross-sectional view thereof.The turntable indicated by 1 in the figure is molded from a plastic magnet mixed with ferrite powder. The pattern is as shown in Figure 1.
NS is alternately magnetized. A plurality of drive coils 3 are arranged on the lower surface so that alternating magnetic poles appear in the circumferential direction.
A turntable 1 is rotatably supported by a spindle 5 erected at the center of the stator 2 . In this way, a motor 5 is formed in which the turntable 1 is directly driven by the rotating magnetic field of the stator 2.
プラスチツクマグネツトを構成する合成樹脂と
しては、熱硬化性のものではフエノール、ポリエ
ステル、熱可塑性のものでは６―ナイロン、ポリ
プロピレンなどが用いられ、またフエライト粉と
してはストロンチウムフエライト、バリウムフエ
ライトなどが用いられる。 The synthetic resins that make up plastic magnets include thermosetting ones such as phenol and polyester, thermoplastic ones such as 6-nylon and polypropylene, and ferrite powders such as strontium ferrite and barium ferrite. .
ここにおいて、これらの原料を混合してターン
テーブル１を成形するとともにフエライト粉に対
する着磁を行なうにあたつては、磁場成形を行な
うことで、ターンテーブル１の下面にフエライト
粉を高濃度に集める。そして交番磁極とする着磁
は、磁場成形時に磁化されたフエライト粉を一旦
消磁し、ついで着磁機による第１図に示したよう
な所要パターンの多極着磁を行なう。 Here, when mixing these raw materials to form the turntable 1 and magnetizing the ferrite powder, magnetic field forming is performed to collect the ferrite powder at a high concentration on the bottom surface of the turntable 1. . To generate alternating magnetic poles, the ferrite powder that has been magnetized during magnetic field forming is once demagnetized, and then a magnetizing machine performs multipole magnetization in a required pattern as shown in FIG.
本発明によれば上述のように、最終的に駆動コ
イルと対向することになる下面にフエライト粉が
高濃度に集まつているために、高価なフエライト
粉を有効に利用した磁気効率及びトルクの高いダ
イレクトドライブ型ターンテーブルを得ることが
でき、また、下面にフエライト粉が高濃度に集ま
るように磁場成形を行なうとはいえ、成形後一旦
消磁して、更に所定の着磁パターンで着磁するた
めに、磁場成形時の着磁パターンがモータとして
の特性に影響を与えることがないものである。し
かも、従来と同量のフエライト粉を使用しても良
好な磁気効率を得ることができるので、ターンテ
ーブル自体の重量の増加がない利点もある。 According to the present invention, as described above, since ferrite powder is concentrated at a high concentration on the lower surface that ultimately faces the drive coil, magnetic efficiency and torque can be improved by effectively utilizing expensive ferrite powder. It is possible to obtain a high-performance direct drive type turntable, and although magnetic field molding is performed so that ferrite powder gathers at a high concentration on the bottom surface, it must be demagnetized once after molding and then magnetized in a predetermined magnetization pattern. Therefore, the magnetization pattern during magnetic field forming does not affect the characteristics of the motor. Furthermore, good magnetic efficiency can be obtained even if the same amount of ferrite powder is used as in the past, so there is an advantage that the weight of the turntable itself does not increase.
第１図は本発明方法により製造されるターンテ
ーブルの下面図、第２図は同上の断面図であり、
１はターンテーブル、２は固定子、３は駆動コイ
ルを示す。
FIG. 1 is a bottom view of a turntable manufactured by the method of the present invention, and FIG. 2 is a sectional view of the same.
1 is a turntable, 2 is a stator, and 3 is a drive coil.
Claims (1)
して下面にフエライト粉を高濃度に集め、成形後
一旦消磁して、更に所定の着磁パターンで着磁す
ることを特徴とするダイレクトドライブ型ターン
テーブルの製造方法。1. A direct drive turntable characterized by magnetically molding a synthetic resin mixed with ferrite powder, collecting ferrite powder at a high concentration on the lower surface, demagnetizing it once after molding, and then magnetizing it in a predetermined magnetization pattern. manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56088376A JPS57202864A (en) | 1981-06-09 | 1981-06-09 | Turntable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56088376A JPS57202864A (en) | 1981-06-09 | 1981-06-09 | Turntable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57202864A JPS57202864A (en) | 1982-12-11 |
| JPH0124026B2 true JPH0124026B2 (en) | 1989-05-09 |
Family
ID=13941067
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56088376A Granted JPS57202864A (en) | 1981-06-09 | 1981-06-09 | Turntable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57202864A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6280253U (en) * | 1985-11-07 | 1987-05-22 | ||
| JPS62147939A (en) * | 1985-12-20 | 1987-07-01 | Shin Kobe Electric Mach Co Ltd | Rotor of motor for direct drive |
| JPS6374739U (en) * | 1986-10-31 | 1988-05-18 |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50139206U (en) * | 1974-05-01 | 1975-11-17 | ||
| JPS5214409U (en) * | 1975-07-18 | 1977-02-01 | ||
| JPS53141499A (en) * | 1977-05-17 | 1978-12-09 | Takagi Kogyo Kk | Powder mold magnet |
| JPS549794A (en) * | 1977-06-24 | 1979-01-24 | Maguneteiku Fuiirudo Kk | Ring type resin magnet having anisotropic magnetism and method of making same |
-
1981
- 1981-06-09 JP JP56088376A patent/JPS57202864A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57202864A (en) | 1982-12-11 |
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