JPS6235358B2 - - Google Patents
Info
- Publication number
- JPS6235358B2 JPS6235358B2 JP55112160A JP11216080A JPS6235358B2 JP S6235358 B2 JPS6235358 B2 JP S6235358B2 JP 55112160 A JP55112160 A JP 55112160A JP 11216080 A JP11216080 A JP 11216080A JP S6235358 B2 JPS6235358 B2 JP S6235358B2
- Authority
- JP
- Japan
- Prior art keywords
- output
- signal
- position signal
- signal processing
- processing circuit
- 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
- 238000001514 detection method Methods 0.000 claims description 25
- 238000004804 winding Methods 0.000 claims description 5
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 7
- 230000004907 flux Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
- H02K29/08—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using magnetic effect devices, e.g. Hall-plates, magneto-resistors
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Brushless Motors (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Description
【発明の詳細な説明】
本発明は３相の無整流子電動機に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a three-phase commutatorless motor.
一般に３相の無整流子電動機において、回転子
の１回転毎に１回のパルス信号（以下、PG信号
と称す）を必要とする場合がある。例えばビデオ
テープレコーダの回転磁気ヘツドを直接３相の無
整流子電動機にて駆動する場合、回転磁気ヘツド
の回転位置を検出するために電動機の回転子の１
回転毎に１回のパルスを必要とする。このような
パルスを発生させるための簡易な方法としては、
電動機の回転子を構成する永久磁石として２極着
磁されたものを使用し、その永久磁石の磁束を感
磁素子にて検出し、PG信号を得るものが使用さ
れている。しかし、永久磁石の極数が少ない場合
には周波数の低い領域で転流に基ずくトルク変動
が発生し、高い回転精度が必要とされる場合には
不適当であるため、一般には４極以上の磁極より
なる３相の無整流子電動機が採用される。 Generally, in a three-phase non-commutator motor, one pulse signal (hereinafter referred to as PG signal) may be required for each rotation of the rotor. For example, when the rotating magnetic head of a video tape recorder is directly driven by a three-phase non-commutated motor, one of the rotors of the motor is used to detect the rotational position of the rotating magnetic head.
Requires one pulse per revolution. A simple way to generate such a pulse is as follows:
A permanent magnet that is magnetized with two poles is used as the permanent magnet constituting the rotor of the electric motor, and the magnetic flux of the permanent magnet is detected by a magnetic sensing element to obtain a PG signal. However, if the permanent magnet has a small number of poles, torque fluctuations will occur in the low frequency range due to commutation, making it unsuitable when high rotational accuracy is required. A three-phase commutatorless motor consisting of magnetic poles is adopted.
このように、４極以上の永久磁石よりなる３相
の無整流子電動機においてPG信号を得るため
に、従来は電動機の回転部に小片のマグネツトを
取り付け、その磁束をコイルなどの感磁素子によ
り検出する方法が採用されている。しかるに、こ
のような従来例においては回転部にマグネツト小
片を取り付けることによるダイナミツクバランス
の悪化、部品点数の増加、また、感磁素子を用い
ることによる、リード線の増加による材料のコス
トの上昇や組立て工数の増加をもたらすという問
題があつた。 In order to obtain a PG signal in a three-phase non-commutator motor consisting of four or more permanent magnets, conventionally a small piece of magnet is attached to the rotating part of the motor, and the magnetic flux is transferred by a magnetic sensing element such as a coil. A detection method is used. However, in such conventional examples, attaching a small magnet piece to the rotating part causes deterioration of the dynamic balance and an increase in the number of parts, and the use of a magnetically sensitive element causes an increase in material costs due to an increase in the number of lead wires. There was a problem in that it resulted in an increase in assembly man-hours.
本発明は、４極以上の磁極よりなる３相の無整
流子電動機において、転流信号検出用として基本
的に必要な３つの位置検出素子より得られる信号
を論理的に処理してPG信号を得るようにしたも
のであり、上記従来例の問題点を除去し得るもの
である。以下、その実施例について図面を参照し
て説明する。第１図は本発明の実施例の基本的構
成図である。同図において、１は回転軸、２，
３，４は後述の着磁部９に対して一定の間隔をお
いて対向配置され、かつ、各々機械的に120゜の
位相差をもつて配置された３相の固定子巻線であ
る。５は回転軸１と共に回転する回転子で、これ
には４極（ｎ＝２）の磁極が着磁された着磁部９
と位置検出トラツク１０が構成されている。６，
７，８はホール素子よりなる第１、第２、第３の
位置検出素子で、各々位置検出トラツクに対して
一定の間隔をおいて対向配置されているとともに
各々機械的に120゜の位相差をもつて配置されて
いる。 The present invention provides a PG signal by logically processing signals obtained from three position detection elements basically required for commutation signal detection in a three-phase non-commutator motor consisting of four or more magnetic poles. Accordingly, the problems of the conventional example described above can be eliminated. Examples thereof will be described below with reference to the drawings. FIG. 1 is a basic configuration diagram of an embodiment of the present invention. In the figure, 1 is the rotation axis, 2,
Reference numerals 3 and 4 denote three-phase stator windings which are arranged opposite to a magnetized portion 9, which will be described later, at a constant interval and are arranged with a mechanical phase difference of 120 degrees. Reference numeral 5 denotes a rotor that rotates together with the rotating shaft 1, which includes a magnetized portion 9 having four magnetic poles (n=2) magnetized.
A position detection track 10 is constructed. 6,
Reference numerals 7 and 8 denote first, second, and third position detection elements made of Hall elements, each of which is arranged opposite to the position detection track at a fixed interval, and each has a mechanical phase difference of 120°. It is located with.
第２図は本発明の実施例における回路ブロツク
図である。同図に於て、６，７，８は第１図に示
した第１、第２、第３の位置検出素子であり、
各々の一方の入力端ｂは接地されており、他の入
力端ａは直流電源Ｅの一端に接続されている。ま
た直流電源Ｅの他方の一端は接地されている。１
１，１２，１３は各々第１、第２、第３の位置信
号処理回路であり、各々差動増幅器１１ａ，１２
ａ，１３ａと波形整流器１１ｂ，１２ｂ，１３ｂ
を含めて構成されている。また、差動増幅器１１
ａには第１の位置検出素子６からの差動出力が入
力され、１１ａの出力は１１ｂに入力されてい
る。差動増幅器１２ａには第２の位置検出素子７
からの差動出力が入力され、１２ａの出力は１２
ｂに入力されている。さらに差動増幅器１３ａに
は第３の位置検出素子８からの差動出力が入力さ
れ、１３ａの出力は１３ｂに入力されている。１
４は３相位置信号発生回路であり、これはインバ
ータ１５，１６，１７と、２入力のANDゲート
回路１８，１９，２０を含めて構成され、上記
ANDゲート回路１８〜２０の一方の入力端には
各々前記位置信号処理回路１１，１２，１３の出
力が入力されると共に、他方の入力端子には位置
信号処理回路の１２，１３，１１の出力信号をイ
ンバータ１６，１７，１５で論理レベルを反転し
た出力が各々入力されている。２１はPG信号発
生手段であり、これはＲ―Ｓフリツプフロツプ回
路２２と、２入力のANDゲート回路２３とで構
成されている。上記Ｒ―Ｓフリツプフロツプ回路
２２のセツト端子Ｓには第１の位置信号処理回路
１１の出力が入力され、リセツト端子Ｒには
ANDゲート回路１９の出力が入力される。ま
た、ANDゲート回路２３の一方の入力端子には
第１の位置信号処理回路１１の出力が、そして、
他方の入力端子にはＲ―Ｓフリツプフロツプ回路
２２の出力が各々入力される。 FIG. 2 is a circuit block diagram in an embodiment of the present invention. In the figure, 6, 7, and 8 are the first, second, and third position detection elements shown in FIG.
One input terminal b of each is grounded, and the other input terminal a is connected to one end of the DC power supply E. Further, the other end of the DC power source E is grounded. 1
1, 12, and 13 are first, second, and third position signal processing circuits, respectively, and differential amplifiers 11a, 12, respectively.
a, 13a and waveform rectifiers 11b, 12b, 13b
It is composed of: In addition, the differential amplifier 11
The differential output from the first position detection element 6 is input to a, and the output of 11a is input to 11b. The differential amplifier 12a includes a second position detection element 7.
The differential output from 12a is input, and the output of 12a is 12
b. Furthermore, the differential output from the third position detection element 8 is input to the differential amplifier 13a, and the output of 13a is input to 13b. 1
4 is a three-phase position signal generation circuit, which is composed of inverters 15, 16, 17 and two-input AND gate circuits 18, 19, 20, and
The outputs of the position signal processing circuits 11, 12, and 13 are input to one input terminal of the AND gate circuits 18 to 20, respectively, and the outputs of the position signal processing circuits 12, 13, and 11 are input to the other input terminals. The outputs of signals whose logic levels are inverted by inverters 16, 17, and 15 are respectively input. Reference numeral 21 denotes a PG signal generating means, which is composed of an RS flip-flop circuit 22 and a two-input AND gate circuit 23. The output of the first position signal processing circuit 11 is input to the set terminal S of the R-S flip-flop circuit 22, and the reset terminal R is input to the set terminal S.
The output of the AND gate circuit 19 is input. Further, the output of the first position signal processing circuit 11 is connected to one input terminal of the AND gate circuit 23, and
The outputs of the RS flip-flop circuit 22 are respectively input to the other input terminals.
第３図は第１図に示した位置検出トラツク１０
の詳細図で、本実施例において、状態Ａには磁極
Ｎを、状態Ｂには磁極Ｓを対応させ、図示の角度
割り合で磁極Ｎ，Ｓを着磁している。 FIG. 3 shows the position detection track 10 shown in FIG.
In this detailed diagram, in this embodiment, the magnetic pole N corresponds to state A, and the magnetic pole S corresponds to state B, and the magnetic poles N and S are magnetized at the illustrated angular ratio.
第４図は第３図の主要部の信号波形を示したも
ので、各図のイ〜チはそれぞれ対応している。 FIG. 4 shows the signal waveforms of the main parts of FIG. 3, and numbers 1 to 1 in each figure correspond to each other.
次に本実施例の動作を説明する。回転子５が例
えば時計方向に回転することにより、第１、第
２、第３の位置検出素子６，７，８は対向する位
置検出トラツク１０の着磁磁極に対応して応答
し、その出力を各々差動増幅器１１ａ，１２ａ，
１３ａにて差動増幅し、さらに、それらの差動増
幅器の出力を各々波形整形器１１ｂ，１２ｂ，１
３ｂにて波形整形することにより、３つの位置検
出素子６，７，８が各々位置検出トラツク１０の
Ｎ極と対向している場合は論理レベル“１”を、
また、Ｓ極と対向している場合は論理レベル
“０”を出力し、その結果、波形整形器１１ｂ，
１２ｂ，１３ｂの出力端には第４図のイ，ロ，ハ
に示す様な信号イ，ロ，ハを得る。 Next, the operation of this embodiment will be explained. When the rotor 5 rotates, for example, clockwise, the first, second, and third position detection elements 6, 7, and 8 respond to the magnetized magnetic poles of the opposing position detection track 10, and their outputs are differential amplifiers 11a, 12a,
13a performs differential amplification, and furthermore, the outputs of these differential amplifiers are transmitted to waveform shapers 11b, 12b, 1, respectively.
By shaping the waveform in step 3b, when the three position detection elements 6, 7, and 8 are each facing the N pole of the position detection track 10, the logic level is set to "1".
In addition, when it faces the S pole, it outputs logic level "0", and as a result, the waveform shaper 11b,
At the output terminals of 12b and 13b, signals a, b, and c as shown in a, b, and c of FIG. 4 are obtained.
すなわち回転子の１回転毎に、信号イは０゜〜
θA（θA＝65゜）、θA＋θ′B〜θA＋θ′B＋θ′
A、180゜〜180゜＋θAの間、論理レベル“１”を
出力し、それ以外の間は論理レベル“０”を出力
する。信号ロは信号イに対し位相が120゜進んだ
信号であり、信号ハは信号イに対し位相が120゜
遅れた信号となる。 In other words, for each revolution of the rotor, the signal A changes from 0° to
θ A (θ A = 65°), θ A +θ′ B ~ θ A +θ′ B +θ′
A , outputs a logic level "1" between 180° and 180°+θ A , and outputs a logic level “0” during other times. Signal B is a signal whose phase is 120 degrees ahead of signal A, and signal C is a signal whose phase is delayed by 120 degrees from signal A.
次に、信号イと、インバータ１６により極性反
転された信号ロの反転信号をANDゲート回路１
８により論理積演算を行うことにより第４図ニに
示す信号ニが第１の位置信号として得られ、ま
た、信号ロと、インバータ１７により極性反転さ
れた信号ハの反転信号とをANDゲート回路１９
により論理演算を行うことにより第４図ホに示す
信号ホが第２の位置信号として得られる。さら
に、信号ハと、インバータ１５により極性反転さ
れた信号イの反転信号とをANDゲート回路１８
により論理演算することにより第４図ヘに示す信
号ヘが第３の位置信号として得られる。すなわち
３相の位置信号ニ，ホ，ヘが得られ、これらの３
相位置信号に従つて３相の固定子巻線２，３，４
に電流を順次供給することにより、連続した回転
力を得ることが可能となる。このような駆動回路
については周知の適当な構成を使用し得るので、
ここでの説明ならびに図示は省略する。 Next, the signal A and the inverted signal of the signal B whose polarity has been inverted by the inverter 16 are connected to the AND gate circuit 1.
By performing an AND operation using 8, the signal d shown in FIG. 19
By performing the logical operation, the signal E shown in FIG. 4E is obtained as the second position signal. Furthermore, the AND gate circuit 18 connects the signal C and the inverted signal of the signal A whose polarity has been inverted by the inverter 15.
By performing the logical operation, the signal shown in FIG. 4 is obtained as the third position signal. In other words, three-phase position signals N, E, and F are obtained, and these three
3-phase stator windings 2, 3, 4 according to the phase position signal
By sequentially supplying current to the two, it is possible to obtain continuous rotational force. For such a drive circuit, any known suitable configuration can be used;
Description and illustration here will be omitted.
次に信号イの論理レベル“０”により、リセツ
ト優先のＲ―Ｓフリツプフロツプ回路２２をセツ
トし、信号ホの論理レベル“０”でリセツトする
ことにより、Ｒ―Ｓフリツプフロツプ回路２２の
出力として第４図トに示すごとき信号トを得るこ
とが出来る。そして、この信号トと信号イを
ANDゲート回路２３により論理演算することに
より、回転子の１回転毎にθA＋θ′B〜θA＋θ′B
＋θ′Aの間だけ論理レベル“１”を出力する第４
図チのごときパルス信号（PG信号）チを得るこ
とができるものである。 Next, by setting the reset-priority RS flip-flop circuit 22 with the logic level "0" of the signal A and resetting it with the logic level "0" of the signal H, the output of the RS flip-flop circuit 22 is set as the fourth output. It is possible to obtain a signal as shown in the figure. And this signal G and signal A
By performing a logical operation using the AND gate circuit 23, θ A + θ' B ~ θ A + θ' B is calculated for each revolution of the rotor.
The fourth output outputs logic level “1” only during +θ′ A.
It is possible to obtain a pulse signal (PG signal) as shown in Figure H.
以上の説明から明らかなように、本発明によれ
ば、４極以上の磁極を持つ３相の無整流子電動機
においても３つの位置検出素子より得られる信号
より電動機の１回転毎に対応した信号が得られる
ものであり、従来方式に比して検出素子の個数が
少なくてすむという利点を有している。なお、前
述の本発明の実施例において、３つの位置検出素
子を機械的に120゜の角度割り出しで配設してい
るが、一般に2n（但し、ｎは２以上の自然数）
極以上の磁極を有する３相無整流子電動機におい
て、３つの位置検出素子を120゜×ｋ／ｎ（但し、ｋ
は３の倍数以外の自然数）の角度差で配置して
も、先述の実施例と同様の効果が得られるという
ことはいうまでもない。また、先述の本発明の実
施例ではθAを65゜とし、各々状態Ａをコード化
しているが、θAは、120゜／ｎ≦θA＜240゜／ｎ
であれば各々のコード幅が異なつても本発明に含
まれることは言うまでもない。 As is clear from the above description, according to the present invention, even in a three-phase non-commutator motor having four or more magnetic poles, a signal corresponding to each rotation of the motor can be obtained from signals obtained from three position detection elements. This method has the advantage that the number of detection elements can be reduced compared to the conventional method. In the above embodiment of the present invention, the three position detection elements are mechanically arranged at an angle of 120°, but generally the angle is 2n (where n is a natural number of 2 or more).
In a 3-phase non-commutator motor with magnetic poles greater than 3, even if the three position detection elements are arranged with an angular difference of 120° x k/n (k is a natural number other than a multiple of 3), the above implementation will not work. Needless to say, the same effect as in the example can be obtained. In addition, in the above-mentioned embodiment of the present invention, θ A is set to 65° and each state A is coded, but θ A is 120°/n≦θ A <240°/n
In this case, it goes without saying that the present invention includes even if the respective code widths are different.
第１図は本発明の実施例の要部基本的構成図、
第２図は本発明の実施例の回路ブロツク図、第３
図は同実施例における位置検出トラツクの詳細
図、第４図は第３図における各部の信号波形図で
ある。
２，３，４…３相の固定子巻線、５…回転子、
６，７，８…第１、第２、第３の位置検出素子、
１０…位置検出トラツク、１１，１２，１３…第
１、第２、第３の位置信号処理回路、１４…３相
位置信号発生回路、２１…PG信号発生手段。
FIG. 1 is a basic configuration diagram of the main parts of an embodiment of the present invention.
Fig. 2 is a circuit block diagram of an embodiment of the present invention;
The figure is a detailed diagram of the position detection track in the same embodiment, and FIG. 4 is a signal waveform diagram of each part in FIG. 3. 2, 3, 4... 3-phase stator winding, 5... rotor,
6, 7, 8...first, second, third position detection elements,
DESCRIPTION OF SYMBOLS 10... Position detection track, 11, 12, 13... First, second, third position signal processing circuits, 14... Three-phase position signal generation circuit, 21... PG signal generation means.
Claims (1)
上の自然数）の磁極が着磁された回転子と、状態
ＡがθA（度）（但し120゜／ｎθA＜240／ｎ）
の角度巾で、状態ＢがθB（度）（但しθB＝360／
ｎ−θA）の角度巾で順次交互にｎ−１回コード
化された後、状態ＡがθA（度）、状態ＢがθB
′（度）（但しθB′＞０）、状態ＡがθA′（但し０
＜θA′＜240゜／ｎ−θA−θB′）、状態Ｂが360
゜／ｎ−（θA＋θA′＋θB′）の角度巾で順次コー
ド化され前記回転子と一体に回転する位置検出ト
ラツクと、前記位置検出トラツク上の状態Ａ，Ｂ
を各々一定の位相差をもつて検出するように固定
配置された第１、第２、第３の位置検出素子と、
前記第１、第２、第３の位置検出素子が状態Ａを
検出する場合論理レベル“１”を状態Ｂを検出す
る場合には論理レベル“０”なる信号を出力する
第１、第２、第３の位置信号処理回路と、前記第
１、第２、第３の位置信号処理回路の出力信号よ
り前記３相の固定子巻線への通電期間を決める３
相の位置信号、すなわち前記第１の位置信号処理
回路の出力信号と前記第２の位置信号処理回路の
出力レベルを反転した信号との論理積を取り第１
の位置信号を、前記第２の位置信号処理回路の出
力信号と、前記第３の位置信号処理回路の出力レ
ベルを反転した信号との論理積を取り第２の位置
信号を、前記第３の位置信号処理回路の出力信号
と前記第１の位置信号処理回路の出力レベルを反
転した信号との論理積を取り第３の位置信号を出
力する３相位置信号発生回路と、前記第１の位置
信号処理回路の出力が“０”で出力が“１”にセ
ツトされ前記第２の位置信号が“０”のとき優先
的に出力が“０”にリセツトされるリセツト優先
Ｒ―Ｓフリツプフロツプ回路と、前記Ｒ―Ｓフリ
ツプフロツプ回路の出力信号と前記第１の位置信
号処理回路の出力信号との論理積を取る論理積回
路より構成されたPG信号発生手段とを具備して
なる無整流子電動機。1 A three-phase stator winding, a rotor magnetized with 2n (where n is a natural number of 2 or more) magnetic poles, and state A is θ A (degrees) (however, 120°/nθ A <240/ n)
With an angular width of , state B is θ B (degrees) (where θ B = 360/
After being encoded sequentially and alternately n-1 times with an angular width of n-θ A ), state A is θ A (degrees) and state B is θ B
′ (degrees) (where θ B ′>0), state A is θ A ′ (where 0
<θ A ′<240°/n−θ A −θ B ′), state B is 360
A position detection track that is sequentially coded with an angular width of ゜/n-(θ A + θ A ′ + θ B ′) and rotates together with the rotor, and states A and B on the position detection track.
first, second, and third position detection elements fixedly arranged to detect each with a certain phase difference;
When the first, second, and third position detecting elements detect state A, the first, second, and third position detecting elements output signals having a logic level "1" and when detecting state B, the logic level "0". 3. Determining the energization period to the three-phase stator windings from the output signals of the third position signal processing circuit and the first, second, and third position signal processing circuits.
The phase position signal, that is, the output signal of the first position signal processing circuit and the signal obtained by inverting the output level of the second position signal processing circuit are ANDed and the first
The second position signal is obtained by ANDing the output signal of the second position signal processing circuit and the signal obtained by inverting the output level of the third position signal processing circuit. a three-phase position signal generation circuit that performs a logical product of the output signal of the position signal processing circuit and a signal obtained by inverting the output level of the first position signal processing circuit and outputs a third position signal; A reset priority R-S flip-flop circuit in which the output of the signal processing circuit is set to "0" and the output is set to "1", and the output is reset to "0" preferentially when the second position signal is "0". , PG signal generating means constituted by an AND circuit that takes the AND of the output signal of the RS flip-flop circuit and the output signal of the first position signal processing circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11216080A JPS5736589A (en) | 1980-08-13 | 1980-08-13 | Commutatorless motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11216080A JPS5736589A (en) | 1980-08-13 | 1980-08-13 | Commutatorless motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5736589A JPS5736589A (en) | 1982-02-27 |
| JPS6235358B2 true JPS6235358B2 (en) | 1987-07-31 |
Family
ID=14579732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11216080A Granted JPS5736589A (en) | 1980-08-13 | 1980-08-13 | Commutatorless motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5736589A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010028479A1 (en) * | 2010-05-03 | 2011-11-03 | Robert Bosch Gmbh | Method and device for driving a permanent magnet excited electrical machine |
-
1980
- 1980-08-13 JP JP11216080A patent/JPS5736589A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5736589A (en) | 1982-02-27 |
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