JPS58221114A - Pulse generator - Google Patents
Pulse generatorInfo
- Publication number
- JPS58221114A JPS58221114A JP57104906A JP10490682A JPS58221114A JP S58221114 A JPS58221114 A JP S58221114A JP 57104906 A JP57104906 A JP 57104906A JP 10490682 A JP10490682 A JP 10490682A JP S58221114 A JPS58221114 A JP S58221114A
- Authority
- JP
- Japan
- Prior art keywords
- slit
- disc
- metal
- width
- disk
- 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
- 229910052751 metal Inorganic materials 0.000 claims description 63
- 239000002184 metal Substances 0.000 claims description 63
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000005530 etching Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/347—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells using displacement encoding scales
- G01D5/3473—Circular or rotary encoders
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optical Transform (AREA)
- Brushless Motors (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、無整流子モータに内蔵されるパルス発生装置
に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pulse generator built into a commutatorless motor.
モータの速度制御、位置制御をする場合、モータ回転軸
にパルス発生装置を直結し、このパルスに従ってモータ
を制御している。モータに無整流子モータを使用する場
合、無整流子モータには回転子の相対位置を検出する回
転子位置検出装置が３ベージ
必要であるだめ、通常前記速度制御、位置制御用パルス
発生装置内にモータ駆動用の回転子位置検出パルス発生
装置も、設けられている。When controlling the speed and position of a motor, a pulse generator is directly connected to the motor rotation shaft, and the motor is controlled according to the pulses. When using a non-commutator motor as a motor, the non-commutator motor requires a three-page rotor position detection device to detect the relative position of the rotor. A rotor position detection pulse generator for driving the motor is also provided.
従来のパルス発生装置は、第１図に示すよむに複数の光
源７，８と複数の受光素子４，５と、光源７，８と受光
素子４，５との間に介在させた速度制御用パルス（以下
制御パルスと略す）と回転子位置検出パルス（以下駆動
パルスと略す）とを発生するスリットコードを備えた光
しゃ断根９及びマスク板６とからなっている。なお、第
１図において、３はモータ１のシャフト２に光しゃ断根
９を取り付けるだめのエンコーダボス、１ｏはモータ駆
動回路である。The conventional pulse generator includes a plurality of light sources 7, 8, a plurality of light receiving elements 4, 5, and a speed control device interposed between the light sources 7, 8 and the light receiving elements 4, 5, as shown in FIG. It consists of a light shielding root 9 and a mask plate 6, which are equipped with a slit cord that generates pulses (hereinafter abbreviated as control pulses) and rotor position detection pulses (hereinafter abbreviated as drive pulses). In FIG. 1, reference numeral 3 indicates an encoder boss for attaching the light-shielding root 9 to the shaft 2 of the motor 1, and 1o indicates a motor drive circuit.
以上の構成において、従来は、光しゃ断根９にメタル薄
板を使用し、このメタル薄板を、エツチング又はプレス
加工により前記制御パルスと駆動パルスとを発生できる
スリットを形成したものを使用している。この際、制御
パルスは１回転当り数十パルス程度のものから数百パル
ス以上のものもあるから、スリット幅は敷部程度のもの
から数十μｍのものもある。これに対して、駆動パルス
はモータの駆動コイル相数に対応しているので、パルス
幅は最小でもコイル切換え電気角に等しいので長さに換
算して数千ｍと広くなる。従って、メタル薄板自体の機
械的強度が問題となり、特に制御パルスが数百パルスを
越えるとスリット加工上メタル薄板の板厚が数十μｍの
単位となるだめ機械的強度が弱くなるという欠点がある
。捷だ、駆動パルス用スリットが円板に対して非対称で
あるとメタル薄板の機械的強度が対称でなくなるという
欠点がある。光しゃ断根９にガラス円板上にクロムをス
リン）状に蒸着したものを使用するという方法もあるが
、ガラス円板では衝撃に弱く、割れ、欠けなどの問題が
有り、一般に高価で実用性に乏１７い。In the above configuration, conventionally, a thin metal plate is used for the light shielding root 9, and this thin metal plate is formed with slits that can generate the control pulse and drive pulse by etching or press processing. At this time, since the control pulses range from several tens of pulses per rotation to several hundred pulses or more, the slit width ranges from the width of a lining to several tens of micrometers. On the other hand, since the drive pulse corresponds to the number of phases of the drive coil of the motor, the pulse width is equal to the coil switching electrical angle at the minimum, so the length is as wide as several thousand meters. Therefore, the mechanical strength of the thin metal plate itself becomes a problem, and especially when the control pulse exceeds several hundred pulses, the thickness of the thin metal plate during slitting becomes tens of micrometers, which causes the disadvantage that the mechanical strength becomes weak. . Unfortunately, if the drive pulse slit is asymmetrical with respect to the disk, the mechanical strength of the thin metal plate will be asymmetrical. There is also a method of using a glass disk with chromium vapor-deposited in the form of sulfur for the light-shielding root 9, but the glass disk is weak against impact and has problems such as cracking and chipping, and is generally expensive and impractical. 17.
さらに、従来の方式では、一つのモータに一つのエツチ
ング厚板が必要であり、同一形状のモータでも駆動コイ
ルの相数が異なれば新たに別種のエツチング厚板が必要
になり、高価になる。Furthermore, in the conventional system, one etched plate is required for one motor, and even if the motors have the same shape, if the number of phases of the drive coil differs, a different type of etched plate is required, which increases the cost.
本発明の目的は」１記欠点を改良したメタル薄口５ベー
；！
板を用いたパルス発生装置を提供することにある。The purpose of the present invention is to improve the shortcomings mentioned in 1. Metal thin-mouth 5 base; An object of the present invention is to provide a pulse generator using a plate.
下
以一本発明の実施例を第２図〜第６図を参照して説明す
る。An embodiment of the present invention will be described below with reference to FIGS. 2 to 6.
第２図は本発明によるパルス発生装置の構成を示すもの
で、無整流子モーターのシャフト２に、同心円上に複数
のスリットコードが形成された第一のメタル円板１１と
無整流子モータの相電流を適時切換えるためのスリット
コードを備えた第二のメタル円板１２とがエンコーダボ
ス３を通して取り付けられている。光源７．８から照射
される光は、第二のメタル円板１２のスリット（切欠部
）と第一のメタル円板１１のスリットを通過し、受光側
に備えられたマスク板６のスリットを通して受光素子４
，５に入射する。マスク板６のスリット部を第一のメタ
ル円板１１もしくは第二〇メタル円板１２の非スリット
部が重畳した時には光源７．８からの照射光はｊ７や断
され受光素子４．５はＯＦＦの状態になる。まだ、マス
ク板６のスリット部と第一のメタル円板１１と第二のメ
タル円板１２のスリット部が重畳した時には光源７，８
６ ページ
からの照射光は透過され受光素子４，６はＯＮの状態に
々る。なお、１３は第一のメタル円板１１と第二のメタ
ル円板１２の重複したスリットコードより生ずる電気信
号から第二のメタル円板１２より生ずる電気信号だけを
取ね出すための電子装置である。FIG. 2 shows the configuration of a pulse generator according to the present invention, in which a first metal disc 11 on which a plurality of slit cords are formed concentrically on a shaft 2 of a non-commutated motor, and A second metal disc 12 provided with a slit cord for timely switching the phase current is attached through the encoder boss 3. The light emitted from the light source 7.8 passes through the slit (notch) of the second metal disc 12 and the slit of the first metal disc 11, and then passes through the slit of the mask plate 6 provided on the light receiving side. Light receiving element 4
, 5. When the non-slit portion of the first metal disk 11 or the second metal disk 12 overlaps the slit portion of the mask plate 6, the irradiated light from the light source 7.8 is cut off to j7 and the light receiving element 4.5 is turned off. becomes the state of When the slits of the mask plate 6 and the slits of the first metal disk 11 and the second metal disk 12 overlap, the light sources 7 and 8 still overlap.
The irradiated light from page 6 is transmitted and the light receiving elements 4 and 6 are turned on. Note that 13 is an electronic device for extracting only the electric signal generated from the second metal disk 12 from the electric signal generated from the overlapping slit cords of the first metal disk 11 and the second metal disk 12. be.
以上の構成において、第一のメタル円板１１に形成され
るスリットコードの中で第二のメタル円板１２のスリッ
トコードと重ね合わされる位置のスリットコードは、第
３図ａ、ｂに示すように第一のメタル円板１１の非スリ
ットコードの幅Ｓ２はマスク板６のスリット幅Ｓ１ に
対してＳｌ〉Ｓ２の関係が満たされている。従って、第
一のメタル円板１１の該スリットコードにおいては光路
を完全にしゃ断することはなく８１．Ｓ２の幅に応じた
受光信号を発生する。第３図ａでは第一のメタル円板１
１のスリット幅Ｓ３はＳｌより十分大であるるが、第３
図すのように８３が８１より小さくても本発明の基本的
思想は変わりない。得られる受光信号に関しては第３図
ａの方が有利であるが、スリ７ページ
ント幅Ｓ３が大きく々る程、機械的強度が弱くなる。一
方、通常無整流子モータの駆動コイルの切換えは高精度
である必要がないので、第二のメタル円板１２の板厚は
第一のメタル円板１１の板厚に比べて十分厚くとること
ができ、例えスリット幅が大きくても十分に強度をもた
せることができる０
この第二のメタル円板１２のスリットコードの非スリッ
ト部の幅は十分第一のメタル円板１１のスリット幅より
犬であるから、第二のメタル円板での非スリット部とマ
スク板６のスリット部が重なる時には光路を完全にしゃ
断し、受光信号は完全にＯＦＦできる。第二のメタル円
板１２のスリット部とマスク板６のスリット部が重なる
時には、照射光は第二のメタル円板１２は完全に透過し
、第一のメタル円板１１のスリットの影響を受けて受光
信号を発生するが前述したように、該スリットコード位
置における第一のメタル円板１１のスリットコードはＳ
ｌ〉Ｓ２が満たされているので光路を完全にしゃ断する
ことはなく、第４図ａのような受光信号を発生する。無
整流子モータの相電流を切換えるだめの信号は、第二の
メタル円板１２のスリットコードによって生じるものの
みが必要であるため、比較器や、スレッシホールドレベ
ルを調整する電子回路１３で、第４図ａの電圧Ｖ。In the above configuration, among the slit cords formed on the first metal disk 11, the slit cords at positions overlapping with the slit cords on the second metal disk 12 are as shown in FIGS. 3a and 3b. The width S2 of the non-slit cord of the first metal disk 11 satisfies the relationship Sl>S2 with respect to the slit width S1 of the mask plate 6. Therefore, the slit cord of the first metal disk 11 does not completely block the optical path. A light reception signal is generated according to the width of S2. In Figure 3a, the first metal disk 1
The slit width S3 of No. 1 is sufficiently larger than Sl, but the slit width S3 of No. 1 is sufficiently larger than Sl.
Even if 83 is smaller than 81 as shown in the figure, the basic idea of the present invention does not change. Although the method shown in FIG. 3a is more advantageous in terms of the obtained light reception signal, the larger the pickpocket width S3 becomes, the weaker the mechanical strength becomes. On the other hand, since the switching of the drive coil of a commutatorless motor usually does not require high precision, the thickness of the second metal disk 12 should be sufficiently thicker than that of the first metal disk 11. Even if the slit width is large, the width of the non-slit portion of the slit cord of the second metal disc 12 is sufficiently larger than the slit width of the first metal disc 11. Therefore, when the non-slit portion of the second metal disk overlaps the slit portion of the mask plate 6, the optical path is completely cut off, and the light reception signal can be completely turned off. When the slits of the second metal disk 12 and the mask plate 6 overlap, the irradiated light completely passes through the second metal disk 12 and is not affected by the slits of the first metal disk 11. As mentioned above, the slit code of the first metal disk 11 at the slit code position is S.
Since l>S2 is satisfied, the optical path is not completely cut off, and a light reception signal as shown in FIG. 4a is generated. Since only the signal generated by the slit cord of the second metal disk 12 is required for switching the phase current of the commutatorless motor, a comparator or an electronic circuit 13 for adjusting the threshold level is used. Voltage V in FIG. 4a.
以下の電圧をカットして、同図すのような信号に成形し
、無整流子モータを駆動する信号としている０
なお、モータ、制御パルスは使用するシステムによって
異なるものであり、どの制御システムにも使用できるよ
う、種々のパルスを発生するスリットコードをそろえて
おく必要があるが、駆動パルスと制御パルスを同一のメ
タル円板にエツチング加工すれば、モータの種別が異々
るとともに、別種のエツチング厚板が必要となり、厚板
の種類が多く、高価になる。本発明は第二のメタル円板
を交換するだけで他機種モータに適用できるパルス発生
装置を提供できるが、マスク板６は機種ごとに厚板を作
る必要がある。第５図に示すように制御パルス用マスク
板１４、駆動パルス用マスク９ ページ
板１６を分離形成し、制御パルス用マスク板１４を寸法
精度の高いエツチングで形成し、駆動）Ｏレス用マスク
板は高い寸法精度が必要々いので、樹脂成形等でマスク
板を形成すれば多機種にわたって同一のマスク板を提供
することができる。まだマスク板を受光素子ホールダと
兼用して樹脂成形すれば、部品点数を削減できる。The following voltage is cut and shaped into a signal as shown in the figure, which is used as a signal to drive a non-commutated motor.0 Note that the motor and control pulses differ depending on the system used, and which control system is used. However, if the drive pulses and control pulses are etched on the same metal disc, it will be possible to use different types of motors and Etched planks are required, and there are many types of planks, which are expensive. Although the present invention can provide a pulse generator that can be applied to other models of motors simply by replacing the second metal disc, it is necessary to make a thick plate for the mask plate 6 for each model. As shown in FIG. 5, the control pulse mask plate 14, the drive pulse mask 9 and the page plate 16 are formed separately, and the control pulse mask plate 14 is formed by etching with high dimensional accuracy. Since high dimensional accuracy is required, if the mask plate is formed by resin molding or the like, the same mask plate can be provided for many types. If the mask plate is also used as a light receiving element holder and molded with resin, the number of parts can be reduced.
さらに、第２図において第一のメタル円板１１及び第二
のメタル円板１２をエンコーダボス３に取り付ける時第
二のメタル円板１２の形状によっては、第一のメタル円
板１１に不均一な圧力を加えることになり、第一のメタ
ル円板１１が不均一に変形することある。この時、第一
メタル円板１１と第二のメタル板１２の間にワッシャを
挟持させれば第一のメタル円板１１にかかる圧力は平均
され、不均一に変形することはない。Furthermore, when attaching the first metal disk 11 and the second metal disk 12 to the encoder boss 3 in FIG. As a result, the first metal disk 11 may be deformed unevenly. At this time, if a washer is sandwiched between the first metal disk 11 and the second metal disk 12, the pressure applied to the first metal disk 11 is averaged, and the first metal disk 11 is not deformed unevenly.
以上のように本発明によれば、第一のメタル円板のスリ
ット幅を小さくすることができ、機械的強度を高めるこ
とができるという利点がある。まだスリットパターンを
対称的な構造にできるので１ｏページ
安定した構造のメタル薄円板を得ることができる。As described above, according to the present invention, there is an advantage that the slit width of the first metal disk can be reduced and the mechanical strength can be increased. Since the slit pattern can still be made into a symmetrical structure, it is possible to obtain a thin metal disk with a stable structure of 10 pages.
さらに第二のメタル円板を交換するだけで他機種モ＝り
にも利用できるという利点がある。Another advantage is that it can be used for other models by simply replacing the second metal disc.
第１図は従来のパルス発生装置の概略構成を示す斜視図
、第２図は本発明にかかるパルス発生装置の概略構成を
示す斜視図、第３図ａ、ｂは第２図の駆動パルス発生部
分のスリット断面図、第４図ａ、ｂは発生信号の説明図
、第５図は第２図のマスク板の他の実施例を示す断面図
である。
１・・・・・・モータ、２・・・・・・シャフト、４，
６・・・・・・受光素子、６・・・・・・マスク板、７
，８・・・・・・光源、１１・・・・・・第一のメタル
円板、１２・・・・・・第二のメタル円板、１３・・・
・・・電子装置。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図
第２図
第３図
／／ｌ
第４図
（ａ）
（ｂン第５図
！FIG. 1 is a perspective view showing a schematic configuration of a conventional pulse generator, FIG. 2 is a perspective view showing a schematic configuration of a pulse generator according to the present invention, and FIGS. 3a and 3b are drive pulse generators shown in FIG. 4A and 4B are explanatory diagrams of generated signals, and FIG. 5 is a sectional view showing another embodiment of the mask plate of FIG. 2. 1...Motor, 2...Shaft, 4,
6... Light receiving element, 6... Mask plate, 7
, 8... Light source, 11... First metal disc, 12... Second metal disc, 13...
...Electronic equipment. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 //l Figure 4 (a)
(Figure 5!
Claims (3)
心円上に配置された複数種のスリットコードを有するモ
ータのシャフトに直結されたメタル薄円板と受光素子の
前面に位置し、前記メタル円板上に形成された前記スリ
ットコードのスリットピッチと等しいスリットコード、
もしくは単一のスリットを施したマスク板とを備え、前
記メタル薄円板は、前記メタル薄円板上の任意のスリッ
トコードの非スリット部の幅を、該スリットコードに対
応してマスク板に形成されるスリット幅より小となしだ
第一のメタル円板と、該スリットコードと同一径にて該
スリット幅より大なるスリットを形成した第二のメタル
円板とより々す、第一のメタル円板と第二のメタル円板
とをモータシャフトに重合し、第一のメタル円板と第二
のメタル円板の重複したスリットコードよシ生ずる電気
信号から、２ページ 第二のメタル円板より生ずる電気信号だけを取り出すよ
う構成したパルス発生装置。(1) Located between multiple light sources and multiple light receiving elements, and located in front of the light receiving element and a thin metal disk directly connected to the shaft of a motor that has multiple types of slit cords arranged concentrically. , a slit cord equal to the slit pitch of the slit cord formed on the metal disk;
or a mask plate provided with a single slit, and the metal thin disk is configured such that the width of the non-slit portion of an arbitrary slit code on the metal thin disk is adjusted to the mask plate in accordance with the slit code. A first metal disc having a width smaller than the slit width to be formed, and a second metal disc having a slit having the same diameter as the slit cord and larger than the slit width. The metal disk and the second metal disk are superimposed on the motor shaft, and from the electric signal generated by the overlapping slit cord of the first metal disk and the second metal disk, the second metal disk on page 2 is generated. A pulse generator configured to extract only the electrical signals generated from the plate.
光側のマスク板を樹脂にて成形し、第二のメタル円板が
重複し々い第一のメタル円板のみのスリットコードに対
応する受光側のマスク板をメタル板にて形成した特許請
求の範囲第１項記載のパルス発生装置。(2) The mask plate on the light-receiving side that corresponds to the frit code of the second metal disc is molded with resin, and the second metal disc corresponds to the slit code of only the first metal disc, which often overlaps. 2. The pulse generator according to claim 1, wherein the mask plate on the light receiving side is made of a metal plate.
特許請求の範囲第１項記載のパルス発生装置。(3) The pulse generator according to claim 1, wherein a shear having a diameter smaller than the slit cord diameter is sandwiched between the first metal disc and the second metal disc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57104906A JPS58221114A (en) | 1982-06-17 | 1982-06-17 | Pulse generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57104906A JPS58221114A (en) | 1982-06-17 | 1982-06-17 | Pulse generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58221114A true JPS58221114A (en) | 1983-12-22 |
| JPS6259245B2 JPS6259245B2 (en) | 1987-12-10 |
Family
ID=14393162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57104906A Granted JPS58221114A (en) | 1982-06-17 | 1982-06-17 | Pulse generator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58221114A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5887203A (en) * | 1995-09-26 | 1999-03-23 | Olympus Optical Co., Ltd. | Movement detection and control device |
| CN106026536A (en) * | 2016-08-08 | 2016-10-12 | 成都茂源科技有限公司 | Method and device for collecting rotor position of permanent magnet synchronous motor of direct-drive type ball mill |
-
1982
- 1982-06-17 JP JP57104906A patent/JPS58221114A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5887203A (en) * | 1995-09-26 | 1999-03-23 | Olympus Optical Co., Ltd. | Movement detection and control device |
| CN106026536A (en) * | 2016-08-08 | 2016-10-12 | 成都茂源科技有限公司 | Method and device for collecting rotor position of permanent magnet synchronous motor of direct-drive type ball mill |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6259245B2 (en) | 1987-12-10 |
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