JPS63257443A - Magnetizing method of magnetization for frequency generator in brushless motor - Google Patents
Magnetizing method of magnetization for frequency generator in brushless motorInfo
- Publication number
- JPS63257443A JPS63257443A JP8793087A JP8793087A JPS63257443A JP S63257443 A JPS63257443 A JP S63257443A JP 8793087 A JP8793087 A JP 8793087A JP 8793087 A JP8793087 A JP 8793087A JP S63257443 A JPS63257443 A JP S63257443A
- Authority
- JP
- Japan
- Prior art keywords
- magnetization
- flux
- driving
- frequency generator
- poles
- 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.)
- Granted
Links
- 230000005415 magnetization Effects 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims description 11
- 230000004907 flux Effects 0.000 abstract description 24
- 230000007257 malfunction Effects 0.000 abstract description 11
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 10
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
Landscapes
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はフロッピー・ディスク・ドライブ装置（以下Ｆ
ＤＤ装置という）やビデオテープレコーダー装置等に用
いられるブラシレスモータの磁石の着磁方法に関するも
のである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a floppy disk drive device (hereinafter referred to as F
The present invention relates to a method of magnetizing the magnets of brushless motors used in devices such as DD devices and video tape recorders.
ＦＤＤ装置やビデオテープレコーダ装置には、回路中の
モータのロータ位置検出用としてパルス発電機（以下Ｐ
Ｃという）が用いられるが、最近、薄形化及び部品点数
削減等の目的により、駆動磁石に周波数発電機（以下Ｆ
Ｃという）用着磁を行うことが多くなっている。FDD devices and video tape recorder devices are equipped with a pulse generator (hereinafter referred to as P) for detecting the rotor position of the motor in the circuit.
Recently, frequency generators (hereinafter referred to as F
C) magnetization is increasingly being performed.
第１図はＦＤＤ装置に用いられているブラシレスモータ
の断面図を示すもので、■はステータヨーク、２はステ
ータヨーク１に固定された駆動用コイル、３はロータヨ
ーク５に設けた駆動用磁石４と前記駆動用コイル間に配
置したＦＣ検出部、６は駆動用コイル２間に設けたホー
ルＩＣ等の有極性磁電変換素子を使用したＰＧセンサ、
７は駆動用磁石４の外側のロータヨーク５に設けたＰＧ
用磁石である。そうして、駆動用磁石４の着磁は、第２
図に示すように先ずＸの範囲に駆動用着磁部αの着磁を
行い、次に外周にＦＣ用着磁部βの着磁を行うようにし
ている。FIG. 1 shows a cross-sectional view of a brushless motor used in an FDD device, where ■ is a stator yoke, 2 is a driving coil fixed to the stator yoke 1, and 3 is a driving magnet 4 provided on a rotor yoke 5. and an FC detection unit disposed between the drive coil 2; 6 a PG sensor using a polarized magnetoelectric conversion element such as a Hall IC disposed between the drive coils 2;
7 is a PG provided on the rotor yoke 5 outside the drive magnet 4
It is a magnet for use. Then, the driving magnet 4 is magnetized by the second magnet.
As shown in the figure, first the drive magnetized part α is magnetized in the X range, and then the FC magnetized part β is magnetized on the outer periphery.
そのため従来のブラシレスモータは、駆動用磁石にＦＧ
用着磁を行う構造であるため駆動磁石の外径が大きくな
ると共に、駆動用着磁の漏虞磁束により磁束量が第３図
に示す磁ように誤動作発生レベルをオーバーするためＰ
Ｇセンサ６が誤動作するという欠点があった。Therefore, in conventional brushless motors, the drive magnet is
Due to the structure in which the drive magnet is magnetized, the outer diameter of the drive magnet becomes large, and the leakage magnetic flux of the drive magnetization causes the amount of magnetic flux to exceed the malfunction occurrence level as shown in Figure 3.
There was a drawback that the G sensor 6 malfunctioned.
この誤動作を防止するため、第４図に示すように、駆動
用着磁部の範囲Ｙを狭くして着磁するようにすると、磁
束分布は第５図に示すようになり、検出部の磁束量は誤
動作発生レベルを越えないようになるが、その反面駆動
用磁束の総磁束が低下し、モータトルクが減少して、所
要のトルクを得るためにモータを大型化しなければなら
ないという問題があった。In order to prevent this malfunction, as shown in Fig. 4, if the range Y of the driving magnetized part is narrowed and magnetized, the magnetic flux distribution will become as shown in Fig. 5, and the magnetic flux of the detection part will be The amount will not exceed the malfunction occurrence level, but on the other hand, the total magnetic flux for driving will decrease, the motor torque will decrease, and there will be a problem that the motor will have to be larger to obtain the required torque. Ta.
そこで、本発明はその着磁方法を変えることにより。駆
動用磁束の総磁束の低下量を最小限にし、ＰＧセンサの
誤動作のないブラシレスモータを提供することを可能と
したものである。Therefore, the present invention changes the magnetization method. This makes it possible to minimize the amount of decrease in the total magnetic flux of the driving magnetic flux and to provide a brushless motor without malfunction of the PG sensor.
本発明は上記の問題点を解決するためになされたもので
ＦＧ用着磁を行う場合、Ｎｉ又はＳ極にバイアスをかけ
乍らＦＧ用着磁を行うようにしたものである。The present invention has been made to solve the above-mentioned problems, and when magnetizing the FG, the FG is magnetized while applying a bias to the Ni or S pole.
実五〇１携−」−
第６図は第１の実施態様の着磁状態を示すもので、この
実施態様では先ず従来と同様、Ｘの範囲に駆動用着磁α
を行う。次に、ＰＧセンサ６の極性に応じてその極性を
減するようなバイアスをかけ乍らＮ極及びＳ極のＦＧ用
着磁を行ってＦＣ用着磁部βを形成した場合である。Fig. 6 shows the magnetized state of the first embodiment. In this embodiment, first, as in the conventional case, the driving magnetization α is set in the range of X.
I do. Next, the FC magnetized portion β is formed by performing N-pole and S-pole FG magnetization while applying a bias to reduce the polarity according to the polarity of the PG sensor 6.
このような着磁を行うと、ＰＧセンサ６によって検出さ
れる着磁の磁束量はＰ７図に示すように誤動作発生レベ
ル以下となるため、従来のように誤動作を起すことがな
い。When such magnetization is performed, the amount of magnetized magnetic flux detected by the PG sensor 6 becomes less than the malfunction occurrence level as shown in Figure P7, so malfunctions do not occur as in the conventional case.
また、駆動用磁束の総磁束はＦＧ用着磁を行わない時よ
り多小減するか、従来より小型のもので同じトルクが得
られるモータを提供することができる効果がある。In addition, the total magnetic flux for driving is slightly reduced compared to when FG magnetization is not performed, or it is possible to provide a motor that is smaller than the conventional motor and can obtain the same torque.
災施皿携−又
第８図は異なる実施態様を示すもので、この実施態様で
はバイアス量を実施態様１より多くした場合である。FIG. 8 shows a different embodiment, in which the amount of bias is greater than that in the first embodiment.
このようにバイアス量を多くすると、第９図に示すよう
にＰＧセンサ６が検出しない極性の磁束分布が変化する
だけで、駆動用着磁の総磁束の低下量を最小限にし、Ｐ
Ｇセンサが誤動作しないモータが得られる。Increasing the amount of bias in this way only changes the magnetic flux distribution of the polarity that is not detected by the PG sensor 6, as shown in FIG.
A motor in which the G sensor does not malfunction can be obtained.
駆動用磁束の総磁束の低下量を最小限にしてＰＧセンサ
の誤動作のないブラシレスモータの提供を可能とする効
果がある。This has the effect of minimizing the amount of decrease in the total magnetic flux of the driving magnetic flux, thereby making it possible to provide a brushless motor without malfunction of the PG sensor.
第１図は公知のブラシレスモータの断面図、第２図は従
来の駆動磁石に対する着磁状態及び着磁方法を説明する
ための図、第３図は第２図に示す着磁方法による場合の
磁束分布を示す図、第４図は従来の異なる着磁方法を説
明するための図、第５図は第４図に示す着磁方法による
場合の磁束分布を示す図、第６図及び第８図は夫々本発
明にか−る駆動磁石に対する着磁方法を説明するための
図、第７図は第６図に示す着磁方法による場合の磁束分
布を示す図、第９図は第８図に示す着磁方法による場合
の磁束分布図である。
１・・・ステータヨーク、
２・・・駆動用コイル、
３・・・ＦＣ検出部、
４・・・駆動用磁石、
５・・・ロータヨーク、
６・・・ＰＧセンサ、
７・・・ＰＣ用磁石、
第８図
第９図
第 ６ 図
第７図
（Ｓ）FIG. 1 is a sectional view of a known brushless motor, FIG. 2 is a diagram for explaining the magnetization state and magnetization method for a conventional drive magnet, and FIG. 3 is a diagram for explaining the magnetization method shown in FIG. Figure 4 is a diagram showing the magnetic flux distribution; Figure 4 is a diagram for explaining different conventional magnetization methods; Figure 5 is a diagram showing the magnetic flux distribution when using the magnetization method shown in Figure 4; Figures 6 and 8 are diagrams showing magnetic flux distribution. The figures are diagrams for explaining the magnetization method for the drive magnet according to the present invention, FIG. 7 is a diagram showing the magnetic flux distribution when the magnetization method shown in FIG. 6 is used, and FIG. 9 is the diagram shown in FIG. FIG. 3 is a magnetic flux distribution diagram when using the magnetization method shown in FIG. DESCRIPTION OF SYMBOLS 1... Stator yoke, 2... Drive coil, 3... FC detection part, 4... Drive magnet, 5... Rotor yoke, 6... PG sensor, 7... For PC Magnet, Figure 8 Figure 9 Figure 6 Figure 7 (S)
Claims (1)
う場合、Ｎ極又はＳ極にバイアスをかけ乍ら周波数発電
機用着磁を行うことを特徴とするブラシレスモータにお
ける周波数発電機用着磁の着磁方法。When a drive magnet of a brushless motor is magnetized for a frequency generator, the magnetization for the frequency generator is performed while applying a bias to the N pole or the S pole. Magnetization method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8793087A JP2631213B2 (en) | 1987-04-11 | 1987-04-11 | Magnetizing method of driving magnet in brushless motor with frequency generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8793087A JP2631213B2 (en) | 1987-04-11 | 1987-04-11 | Magnetizing method of driving magnet in brushless motor with frequency generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63257443A true JPS63257443A (en) | 1988-10-25 |
| JP2631213B2 JP2631213B2 (en) | 1997-07-16 |
Family
ID=13928630
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8793087A Expired - Fee Related JP2631213B2 (en) | 1987-04-11 | 1987-04-11 | Magnetizing method of driving magnet in brushless motor with frequency generator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2631213B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6954014B2 (en) * | 2003-05-15 | 2005-10-11 | Japan Servo Co., Ltd. | Motor with frequency generator and office automation equipment using same |
-
1987
- 1987-04-11 JP JP8793087A patent/JP2631213B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6954014B2 (en) * | 2003-05-15 | 2005-10-11 | Japan Servo Co., Ltd. | Motor with frequency generator and office automation equipment using same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2631213B2 (en) | 1997-07-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |