JPS6218956A - Detector for rotational angle for motor - Google Patents

Detector for rotational angle for motor

Info

Publication number
JPS6218956A
JPS6218956A JP2235085A JP2235085A JPS6218956A JP S6218956 A JPS6218956 A JP S6218956A JP 2235085 A JP2235085 A JP 2235085A JP 2235085 A JP2235085 A JP 2235085A JP S6218956 A JPS6218956 A JP S6218956A
Authority
JP
Japan
Prior art keywords
detection
rotor
magnetic pole
magnet
rotor magnet
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.)
Pending
Application number
JP2235085A
Other languages
Japanese (ja)
Inventor
Kazuo Aoki
一男 青木
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Electric Co Ltd
Nidec Seimitsu Corp
Original Assignee
Sanyo Electric Co Ltd
Sanyo Seimitsu Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sanyo Electric Co Ltd, Sanyo Seimitsu Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP2235085A priority Critical patent/JPS6218956A/en
Publication of JPS6218956A publication Critical patent/JPS6218956A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K21/00Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/24Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets axially facing the armatures, e.g. hub-type cycle dynamos
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K29/00Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H02K29/06Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
    • H02K29/08Motors 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)
  • Permanent Magnet Type Synchronous Machine (AREA)

Abstract

PURPOSE:To reduce the influence of leakage flux from a rotor magnet, by providing a stator section with two detecting elements for detecting the variation of magnetic flux from two detected pole sections at the same time, and by synthesizing two kinds of the detection output. CONSTITUTION:In order to detect the variation of magnetic flux from two detected pole sections 9a, 9b arranged mutually on a rotor section 10 by two detecting elements 11a, 11b, each detected output of each detecting element 11a, 11b is mutually and positionally shifted at the rotational angle of 180 deg.. Accordingly, by each detected output of each detecting element, pulse signals corresponding with two detected pole sections 9a, 9b at each rotational angle of 180 deg. are positively and negatively used. By both detecting elements 11a, 11b pulse signals are generated at the same time, and the pulse signal of the detecting element on one side is positive signal, and the pulse signal of the detecting element on the other side is negative. Accordingly, by synthesizing the positive pulse signal with the negative one, detected output due to leakage flux from a rotor magnet is offset.

Description

【発明の詳細な説明】 (イ)産業上の利用分野 本発明はロー声部の回転角度を検出してパルス信号を発
生するモータの回転角度検出装置に関し、ロータ部の1
回転当シに生ずる2個のパルス信号を利用する装置1(
たとえばVTRのへラド駆動装置m)に好適するもので
ある。
DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a rotation angle detection device for a motor that detects the rotation angle of a low voice part and generates a pulse signal.
Device 1 that utilizes two pulse signals generated during rotation
For example, it is suitable for a head drive device m) of a VTR.

(ロ)従来の技術 ロータ部にロータの位置を検出する手段を取付け、この
検出平膜からロータが回転する毎に、パルス信号が発生
するようにした装置は、特開昭57−166871号公
鍜に開示されている。
(b) Conventional technology A device in which a means for detecting the position of the rotor is attached to the rotor part and a pulse signal is generated from this detection flat membrane every time the rotor rotates is disclosed in Japanese Patent Laid-Open No. 57-166871. It is disclosed on the cover.

この装置を簡単に説明すると、ロータヨークの外側の対
抗する2箇所に、2個の小磁石をロータヨークの外周と
直角に、しかもロータ部に設けたロータマグネットの磁
束が極大とな−る位置に極性を一致させて配設し、ステ
ータ部には小磁石に対抗し得る検出巻IMt−配役し、
小磁石が検出巻線に接近し通過する毎に、パルス信号を
発生するようにW構成したものである。
To briefly explain this device, two small magnets are placed at two opposite locations on the outside of the rotor yoke, perpendicular to the outer periphery of the rotor yoke, and polarized at a position where the magnetic flux of the rotor magnets provided in the rotor is at its maximum. A detection winding IMt which can oppose the small magnet is arranged in the stator part,
The W configuration is such that a pulse signal is generated each time a small magnet approaches and passes a detection winding.

この装置は、2個の小磁石からの検出するパルス信号が
正と負となるように、2個の小砥石の取付位置がt−a
O&対抗位置であって、ロータマグネットの対抗磁極部
の極性が異極である位置になる丸め、ロータマグネット
の磁極対故は苛政の場合に限られる。
In this device, the mounting positions of the two small grindstones are set at t-a so that the pulse signals detected from the two small magnets are positive and negative.
O & opposite position, rounding to a position where the opposing magnetic pole portions of the rotor magnet have different polarities, the rotor magnet's magnetic pole pairing is limited to severe cases.

このため、ロータマグネットの磁極対数が偶飲の場合に
は、上記装置を適用することができない。
Therefore, if the number of magnetic pole pairs of the rotor magnet is uneven, the above device cannot be applied.

この点を図面に基いて具体的に説明する。第5図はロー
タ部1iQ1に取付けた2個の小磁石(16a)(16
b)と検出巻線(1ηとの関係を示す説明図である。
This point will be specifically explained based on the drawings. Figure 5 shows two small magnets (16a) (16
FIG. 4 is an explanatory diagram showing the relationship between the detection winding (1η) and the detection winding (1η).

この図面において、ロータヨーク(2)に取付けられる
ロータマグネット+6)は8極であり、磁極対数が偶g
!Kfmr4jである。このためロータヨーク(2)の
対抗する2置所に取付けられる小磁石(16m)(16
b)  は径方同外方喘側の極性が互いに異極であるが
、対抗するロータマグネット(6)の磁極は同極のたと
えば[Sj極である。このため、ロータ部Uの1回転時
におけるロータマグネット(6)から漣戊颯束分布特性
が第6凶(イ)に示すものであるに対(し、小磁石(1
6a〕C16b)  からの磁束に基つく検出@線0η
の誘起電圧特性は同図(ロフに示すものであり、その両
磁束の合成に基づく誘起′嘔圧持性は同図(ハ)に示す
ものとなる。従って一方の小磁石(16a〕によるパル
ス信号(18a)はその波高1m0C)が高く利用可能
であるが、他方の小磁石(16b)によるパルス信号(
18bJはその波高値(至)がロータマグネット(6)
の漏洩磁束に基づく電圧(18C,1よシも低くなり、
利用することができない。
In this drawing, the rotor magnet +6) attached to the rotor yoke (2) has eight poles, and the number of magnetic pole pairs is even
! This is Kfmr4j. For this purpose, small magnets (16 m) (16
In b), the polarities on the radially outer side are different from each other, but the magnetic poles of the opposing rotor magnets (6) are the same, for example [Sj pole]. Therefore, during one rotation of the rotor part U, the flux distribution characteristic from the rotor magnet (6) is as shown in the sixth example (A), whereas the small magnet (1
6a]C16b) Detection based on magnetic flux from 0η line
The induced voltage characteristics are shown in the same figure (low), and the induced voltage characteristics based on the combination of both magnetic fluxes are shown in the same figure (c).Therefore, the pulse generated by one small magnet (16a) The signal (18a) has a high wave height of 1 m0C) and can be used, but the pulse signal (16b) generated by the other small magnet (16b)
For 18bJ, the peak value (to) is the rotor magnet (6)
The voltage based on the leakage magnetic flux (18C, lower than 1,
Not available.

(ハ)発明が解決しようとする間迫点 零発Ij+1はかかる点に鑑み発明されたものにして、
ロータマグネットの磁極対数が苛政の場合に限らず、偶
数である場合にも、ロータヨークの対抗する2(&所に
設ける検出磁極部に基つくパルス信号を有効に利用して
ロータ部の回転角Kを検出することができると共にその
パルス信号を波高値の嶋つ いものとし、またロータマグネットかへ声洩磁束の影響
を一■及的に低減した装flitを提供せんとする1も
、のである。
(c) The close-point zero-start Ij+1 that the invention attempts to solve was invented in view of this point,
Not only when the number of magnetic pole pairs of the rotor magnet is exact, but also when the number is even, the rotation angle of the rotor can be It is also an object of the present invention to provide a flit device that can detect the pulse signal, make the pulse signal uniform in peak value, and temporarily reduce the influence of leakage magnetic flux to the rotor magnet.

(→ 問題点を解決する九めの手段 かかる問題点を解決するため、ロータマグネットを取付
ける皿状ロータヨークの立上シ周縁の対抗位置に夫々検
出磁極部を設けると共にこの2個゛の検出磁極部かり真
東変化を同時に検出する21固゛          
        の検出素子をステータ部に設け、この
2個の検出出力を合成することを特徴とするものである
(→ Ninth means for solving the problem) In order to solve this problem, detection magnetic pole parts are provided at opposite positions on the periphery of the rising edge of the dish-shaped rotor yoke to which the rotor magnet is attached, and these two detection magnetic pole parts are 21 fixed points that simultaneously detect due east changes
The present invention is characterized in that a detection element is provided in the stator section, and the two detection outputs are combined.

(ホ)作 用 2個の検出菓子が互いにロータ部に設けた2個の検出磁
極部からの磁束変化を検出するため、各検出素子の検出
出力は互いに回転角180度ずれたものになる。従って
各検出菓子は回転角180度毎に2個の検出磁極部に対
応したパルス信号を正負に生ずる。雨検出素子は同時に
パルス信号を発生し、一方の検出素子のパルス信号は正
信号であり、他方の検出素子のパルス信号は負である。
(E) Function Since the two detection confections detect changes in magnetic flux from the two detection magnetic poles provided on the rotor, the detection outputs of each detection element are shifted by 180 degrees in rotational angle from each other. Therefore, each detection confectionery generates positive and negative pulse signals corresponding to the two detection magnetic poles every 180 degrees of rotation angle. The rain detection elements simultaneously generate pulse signals, the pulse signal of one detection element being a positive signal and the pulse signal of the other detection element being negative.

このため、この正負のパルス信号を合成すれば、一方の
検出素子のパルス信号の大きさより大きいパルス侶9に
なり、また同時にロータマグネットからの漏洩磁束に基
づく検出出力を相殺する。
Therefore, when these positive and negative pulse signals are combined, the pulse signal 9 becomes larger than the pulse signal of one of the detection elements, and at the same time, the detection output based on the leakage magnetic flux from the rotor magnet is canceled out.

(へ)実 施 −例 本発明の一実施例を図面に基いて説明する。(f) Implementation - Examples An embodiment of the present invention will be described based on the drawings.

第1図はモータの角度検出装置の断面図である。FIG. 1 is a sectional view of a motor angle detection device.

この図面において、(1)はロータヨーク(2)に固着
されたロータシャフトにして、ステータヨーク(3)に
固着された軸支部(4)に保持された軸受!5)15)
にて回転自在に軸支される。
In this drawing, (1) is a rotor shaft fixed to a rotor yoke (2), and a bearing held by a shaft support (4) fixed to a stator yoke (3)! 5)15)
It is rotatably supported on the shaft.

(6)は円周方向に複故個の磁極に分割してf磁された
ロータマグネットにして、立上り周縁(2a)を有する
皿状ロータヨーク(2)に取付けられ、ロータ部u1を
構成する。
(6) is a rotor magnet which is divided into multiple magnetic poles in the circumferential direction and magnetized, and is attached to a dish-shaped rotor yoke (2) having a rising edge (2a), thereby forming a rotor portion u1.

(7)はfIiA妨コイルにして、ステータヨーク(3
)に複故個取付けられ、回路基板(8)に印刷された印
刷配線に接続して、ステータ部■を構成する。(9a)
(9b〕はロータヨーク(2)の立上り周縁(2a)の
対抗位置に形成された検出磁極部にして、この実施例で
は径方向外方肩側の極性が互いに異極である小磁石が使
用されている。またこの実施例では検出磁極部(9m)
(9b)の設置位置がロータマグネット(6)の磁極の
磁束が最大となる位置に投けられているが、この設置位
置は任意にしてもよい。
(7) is the fIiA coil, and the stator yoke (3
) and are connected to the printed wiring printed on the circuit board (8) to form the stator section (2). (9a)
(9b) is a detection magnetic pole portion formed at a position opposite to the rising edge (2a) of the rotor yoke (2), and in this embodiment, small magnets whose polarities on the radially outer shoulder side are different from each other are used. In this example, the detection magnetic pole part (9m)
Although the installation position of (9b) is set at the position where the magnetic flux of the magnetic pole of the rotor magnet (6) is maximum, this installation position may be set arbitrarily.

(11m)(11b)は2個の検出磁、!f部(9a)
(9b)を同時に検出する検出素子にして、実施例では
検出コイルにて*Otされており、ロータシャフト(1
)を介して対抗するステータ都田に取付けられている。
(11m) (11b) is two detection magnets,! f part (9a)
(9b) is used as a detection element that simultaneously detects the detection coil.
) is attached to the opposing stator Miyakoda.

而して、本発明はロータマグネット(6)の磁極対数が
奇数であっても偶数の場合にも適用することができるが
、この実施例では磁極対政が偶数の「4」即ち磁極が8
極であるとする。この場合のロータ部U〔に設けた2個
の検出磁極部(9a)(9b)と検出素子(11m)(
llb)との関係説明図を第2図に示す。この状惑でロ
ータ部11(Iが回転すると、一方の検出素子(11M
)の検出電圧出力特性は第6図信)に示すものとなり、
回転角180度毎に検出磁m部(9a)と(9b)を交
互に検出してパルス状信号(12m)(12b)を生ず
る。一方のパルス状48号<12m)は検出磁極@(9
1)による第6図←)の「S」の信号と同図(イ)に示
すロータマグネット(6)の漏洩磁束に基づく信号を加
算したものであり、他方のパルス状信号(12b)は同
図(ロ)のrNJの信号と前記漏洩磁束に基づぐ信号を
減算したものである。
Thus, the present invention can be applied to cases where the number of magnetic pole pairs of the rotor magnet (6) is an odd number or an even number, but in this embodiment, the number of magnetic pole pairs is an even number "4", that is, the number of magnetic poles is 8.
Suppose that it is a pole. In this case, the two detection magnetic pole parts (9a) (9b) and the detection element (11m) (
Fig. 2 shows an explanatory diagram of the relationship with llb). When the rotor part 11 (I) rotates due to this confusion, one of the detection elements (11M
The detected voltage output characteristics of ) are shown in Figure 6),
The detection magnet m sections (9a) and (9b) are alternately detected every 180 degrees of rotation angle to generate pulsed signals (12m) (12b). One pulse type No. 48 < 12 m) is the detection magnetic pole @ (9
It is the sum of the "S" signal in Figure 6 ←) according to 1) and the signal based on the leakage magnetic flux of the rotor magnet (6) shown in Figure (A), and the other pulsed signal (12b) is the same. This is the result of subtracting the rNJ signal in Figure (b) from the signal based on the leakage magnetic flux.

同様に他方の検出素子(jib)の検出電圧出力特性は
、コイルの接続を反転したものとして出力され、第6図
←)に示すものとなる。この出力特性はパルス状411
9CIS&)C15b)を有し、−万f)/<ルス状信
号(138)はパルス状信号(12b)を180度の位
相差で正負反転したものと同じであり、他方のパルス状
信号(13))はパルス状信号(12&)を180度の
位相差で正負反転したものと同じである。尚、同図(イ
)(ロ)中の(12C)(13C)は漏洩磁束による検
出電圧の特性である。また同図において横軸は回転角度
であり、縦軸は電圧の大きさである。
Similarly, the detection voltage output characteristic of the other detection element (jib) is output with the coil connection reversed, and is as shown in FIG. 6←). This output characteristic is pulse-like 411
9CIS &) )) is the same as the pulsed signal (12&) with its positive and negative polarities inverted with a phase difference of 180 degrees. Note that (12C) and (13C) in (a) and (b) of the same figure are the characteristics of the detected voltage due to leakage magnetic flux. Also, in the figure, the horizontal axis is the rotation angle, and the vertical axis is the voltage magnitude.

両検出巣子による検出出力は合成さnて同図eつの特性
となり、パルス状信号C12m)と(13m)が重畳さ
れてパルス信号(14&)となり、パルス状但号(12
b)と(13b)が重畳されてパルス信号(14b)と
なる。また漏洩磁束の検出電圧(12C)(13C)は
互いに相殺される。
The detection outputs from both detection nests are combined and have the same characteristics as shown in the figure, and the pulse-like signals C12m) and (13m) are superimposed to become the pulse signal (14&), which is the pulse-like signal (12
b) and (13b) are superimposed to form a pulse signal (14b). Further, the leakage magnetic flux detection voltages (12C) (13C) cancel each other out.

以上の実施例においては、ロータマグネット(6)の磁
極対数が偶数の場合としたが、奇数である場合にも、雨
検出素子(ll&)(Ilb)の検出出力を合成したパ
ルス信号(14m)(14b)が得られ、本発明をその
まま適用することができる。
In the above embodiment, the number of magnetic pole pairs of the rotor magnet (6) is an even number, but even when the number of magnetic pole pairs is odd, a pulse signal (14 m) is generated by combining the detection outputs of the rain detection elements (ll&) (Ilb). (14b) is obtained, and the present invention can be applied as is.

このロータマグネット(6)の磁束対数が奇数である場
合には、ロータマグネットの180度対抗位置における
磁極の極性が異極である丸め、2個の検出磁m都(91
)(9b)としては、上記実施例の小磁石に限らず、ロ
ータマグネット(6)の磁極をそのまま利用することが
できる。即ち第4図に示すように、ロータマグネット(
6)を収納するロータヨーク(2)の立上り周縁(2a
)の対抗位置に開口部(15m)(15b)を設け、こ
れらの開口部からの漏れ磁束を検出素子(l1m)(1
11))により同時に検出する。
When the magnetic flux logarithm of this rotor magnet (6) is an odd number, two detection magnets (91
) (9b) is not limited to the small magnet of the above embodiment, but the magnetic pole of the rotor magnet (6) can be used as is. That is, as shown in Fig. 4, the rotor magnet (
The rising edge (2a) of the rotor yoke (2) that houses the
) are provided at opposite positions of the openings (15m) (15b), and the leakage magnetic flux from these openings is detected by the detection element (l1m) (1
11))).

(ト)  発明の効果 本発明はロータマグネットを取付ける皿状ロータヨーク
の立上り周縁の対抗位置に犬々検出颯極部t−設けると
共に−この2個の検出磁極部からの磁束変化を同時に検
出する2個の検出索子をステータ部に役け、この2債の
検出出力を合成することを特徴とするものであるから、
ロータマグネットの磁極対数が奇数の場合に限らず、偶
数である場合にも、前記検出磁極部に基づくパルス1d
号を有効に利用してロータ部の回転角Kを検出すること
ができると共にそのパルス信号を波高値の高いも・のと
することができ、またロータマグネットからの漏洩磁束
の#―を可及的に低減することができる。
(G) Effects of the Invention The present invention provides two detection magnetic pole portions at opposing positions on the rising edge of the dish-shaped rotor yoke to which the rotor magnet is attached, and simultaneously detects changes in magnetic flux from these two detection magnetic pole portions. It is characterized by using two detection probes in the stator section and synthesizing the detection outputs of these two bonds.
Not only when the number of magnetic pole pairs of the rotor magnet is an odd number but also when the number is even, the pulse 1d based on the detection magnetic pole part
The rotation angle K of the rotor section can be detected by effectively using the pulse signal, and the pulse signal can be made to have a high peak value, and the leakage magnetic flux from the rotor magnet can be reduced. can be reduced.

【図面の簡単な説明】[Brief explanation of drawings]

第1図乃至第4図は本発明の一実施例を示し、第1図は
本発明による装置の断面図、第2図はロータ部と検出素
子の関係説明図、第6図(イ)(ロ)(うは検出電圧特
性図である。第4図は検出磁極部の変形例を示すロータ
部の斜視図でるる。 第5図及び第6図は従来の表置を示し、第5図はロータ
部と検出巻線の関係説明図、第6凶りンは漏洩磁束特性
図、同図(ロ)(ハ)は検出出力特性図である。 (6)・・・ロータマグネット、(2m)・・・立上り
周縁、(2)・・・ロータヨーク、(至)・・・ロータ
部、(7)・・・駆動コイル、■・・・ステータ部、(
9m)(9し)・・・検出磁極部、(11m)(llb
)−・・検出素子。 第2図 第6図
1 to 4 show one embodiment of the present invention, FIG. 1 is a sectional view of the device according to the present invention, FIG. 2 is an explanatory diagram of the relationship between the rotor part and the detection element, and FIG. B) (U) is a detection voltage characteristic diagram. FIG. 4 is a perspective view of the rotor section showing a modified example of the detection magnetic pole section. FIGS. 5 and 6 show the conventional display, and FIG. is an explanatory diagram of the relationship between the rotor part and the detection winding, the sixth line is a leakage magnetic flux characteristic diagram, and figures (B) and (C) are detection output characteristic diagrams. (6) Rotor magnet, (2 m )...Rising edge, (2)...Rotor yoke, (to)...Rotor section, (7)...Drive coil, ■...Stator section, (
9m) (9shi)...Detection magnetic pole part, (11m) (llb
)--Detection element. Figure 2 Figure 6

Claims (1)

【特許請求の範囲】[Claims] (1)ロータマグネツトを、このマグネツトの外周壁を
被覆する立上り周縁を有する皿状ロータヨークに取付け
てなるロータ部と、 ロータマグネツトに対抗する複数個の駆動コイルを有す
るステータ部と、 前記立上り周縁の対抗位置に設けた2個の検出磁極部と
、 ステータ部に設けられ、前記2個の検出磁極部からの磁
束変化を同時に検出する2個の検出素子と、 を備え、この2個の検出素子の検出出力を合成すること
を特徴とするモータの回転角度検出装置。
(1) A rotor portion in which a rotor magnet is attached to a dish-shaped rotor yoke having a rising peripheral edge covering the outer circumferential wall of the magnet, a stator portion having a plurality of drive coils opposing the rotor magnet, and the rising edge. Two detection magnetic pole sections provided at opposing positions on the periphery; and two detection elements provided on the stator section for simultaneously detecting changes in magnetic flux from the two detection magnetic pole sections. A motor rotation angle detection device characterized by combining detection outputs of detection elements.
JP2235085A 1985-02-07 1985-02-07 Detector for rotational angle for motor Pending JPS6218956A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2235085A JPS6218956A (en) 1985-02-07 1985-02-07 Detector for rotational angle for motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2235085A JPS6218956A (en) 1985-02-07 1985-02-07 Detector for rotational angle for motor

Publications (1)

Publication Number Publication Date
JPS6218956A true JPS6218956A (en) 1987-01-27

Family

ID=12080209

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2235085A Pending JPS6218956A (en) 1985-02-07 1985-02-07 Detector for rotational angle for motor

Country Status (1)

Country Link
JP (1) JPS6218956A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01171575U (en) * 1988-05-19 1989-12-05
JPH031676U (en) * 1989-05-19 1991-01-09
JPH04138344A (en) * 1990-09-28 1992-05-12 Matsushita Electric Ind Co Ltd Wiring-pattern inspecting apparatus
GB2483177A (en) * 2011-10-19 2012-02-29 Protean Electric Ltd Electric motor or generator having first and second sensors mounted on stator

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01171575U (en) * 1988-05-19 1989-12-05
JPH031676U (en) * 1989-05-19 1991-01-09
JPH04138344A (en) * 1990-09-28 1992-05-12 Matsushita Electric Ind Co Ltd Wiring-pattern inspecting apparatus
GB2483177A (en) * 2011-10-19 2012-02-29 Protean Electric Ltd Electric motor or generator having first and second sensors mounted on stator
GB2483177B (en) * 2011-10-19 2013-10-02 Protean Electric Ltd An electric motor or generator

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