JP2001145304A - Canned motor device - Google Patents

Canned motor device

Info

Publication number
JP2001145304A
JP2001145304A JP32455399A JP32455399A JP2001145304A JP 2001145304 A JP2001145304 A JP 2001145304A JP 32455399 A JP32455399 A JP 32455399A JP 32455399 A JP32455399 A JP 32455399A JP 2001145304 A JP2001145304 A JP 2001145304A
Authority
JP
Japan
Prior art keywords
rotor
axial
detection
wear
radial
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
JP32455399A
Other languages
Japanese (ja)
Inventor
Hisashi Misato
久 三里
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.)
Teikoku Electric Mfg Co Ltd
Original Assignee
Teikoku Electric Mfg 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 Teikoku Electric Mfg Co Ltd filed Critical Teikoku Electric Mfg Co Ltd
Priority to JP32455399A priority Critical patent/JP2001145304A/en
Publication of JP2001145304A publication Critical patent/JP2001145304A/en
Pending legal-status Critical Current

Links

Landscapes

  • Sliding-Contact Bearings (AREA)

Abstract

PROBLEM TO BE SOLVED: To improve detection precision without influence of a change in the load of a canned motor 32 on the detection of the axial wear of bearings 48a, 48b by improving the detection sensitivity of radial wear of the bearings 48a, 48b. SOLUTION: A rotor groove 41 in a rotor 43 of a canned motor 32 is formed so as to be axially-parallel, or the tilting of the rotor groove 41 is eliminated. From the radial and axial displacement of the rotor 43, the radial and axial wear to bearings 48a, 48b are monitored based on the output signals of radial detection coils 62a, 62b and axial detection coils 69a, 69b formed at a stator 37. By eliminating the influence of the tilting of the rotor groove 41, it is possible to improve the detection sensitivity of the radial wear of the bearings 48a, 48b and the detection precision of the axial wear thereof without influence of a change in the load of the canned motor 32 on the detection of the axial wear to the bearings 48a, 48b.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、キャンドモータの
回転子を支承する軸受の摩耗を回転子の位置変位から監
視するキャンドモータ装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a canned motor device for monitoring wear of a bearing for supporting a rotor of a canned motor from displacement of the rotor.

【0002】[0002]

【従来の技術】一般に、キャンドモータは、ポンプ駆動
用として採用されており、化学プラントなどに使用され
て高い信頼性を要求されるため、その回転子を支承する
軸受の摩耗の状態を外部から監視する必要がある。
2. Description of the Related Art In general, canned motors are used for driving pumps, and are used in chemical plants and the like, and are required to have high reliability. Need to be monitored.

【0003】従来、キャンドモータの運転監視装置とし
ては種々のものが知られており、例えば、特公昭58−
54580号公報に示すように、図10ないし図12に
おいて、固定子1の歯部2に空間角で180度離してこ
の歯部2の軸方向全長に亘って巻回した一対の検出コイ
ル3a ,3b を設け、これら検出コイル3a ,3b に固定子
1と回転子4との磁気空隙5を隔てて対向する回転子溝
6との関係位置が、両検出コイル3a ,3b に発生する基
本波成分が互いに打ち消されて高調波成分の瞬時値の合
成値が検出されるように、両検出コイル3a ,3b を直列
に接続して検出部7を構成し、指示器8に接続した構成
の運転監視装置が提案されている。
Conventionally, various types of canned motor operation monitoring devices have been known.
As shown in Japanese Patent No. 54580, in FIGS. 10 to 12, a pair of detection coils 3a, 3a, 3b, which are wound around the tooth portion 2 of the stator 1 at a space angle of 180 degrees over the entire length of the tooth portion 2 in the axial direction. 3b, the relative position between the detection coils 3a and 3b and the rotor groove 6 opposed to the stator 1 and the rotor 4 via the magnetic gap 5 is determined by the fundamental wave components generated in the detection coils 3a and 3b. Are connected to each other and the detection unit 7 is connected in series, and the operation monitoring of the configuration connected to the indicator 8 is performed so that the two detection coils 3a and 3b are connected in series so that the combined values of the instantaneous values of the harmonic components are detected. A device has been proposed.

【0004】この運転監視装置では、図13に示すよう
に、回転子4を支承する軸受9a ,9b の半径方向摩耗量
と検出部7の検出電圧との関係のように、回転子4の半
径方向変位を検知してこの回転子4を支承する軸受9a
,9b の半径方向摩耗量を検出することができる。な
お、この構成においては、図14に示すように、検出電
圧はキャンドモータの負荷変化による電流変化の影響を
若干受けるが、一方ではR相欠相(×印)、S相欠相
(△印)、T相欠相(□印)時には検出電圧が倍程度に
増大するので欠相運転をも検出することができる。
In this operation monitoring device, as shown in FIG. 13, the radius of the rotor 4 is determined by the relationship between the amount of wear of the bearings 9a and 9b supporting the rotor 4 in the radial direction and the voltage detected by the detection unit 7. A bearing 9a that supports the rotor 4 by detecting a directional displacement.
, 9b in the radial direction. In this configuration, as shown in FIG. 14, the detected voltage is slightly affected by a current change due to a change in the load of the canned motor, but on the other hand, the R-phase open phase (x mark) and the S-phase open phase (△ mark) ), When the T phase is out of phase (indicated by a square), the detection voltage increases about twice, so that the open phase operation can also be detected.

【0005】また、特公昭57−21924号公報に記
載されているように、図15および図16において、固
定子1の歯部2の軸方向両端部に切欠溝を設けて一対の
検出コイル10a ,10b を設け、これら両検出コイル10a
,10b を整流回路11a ,11bを介して直列に接続して指
示器8に接続した構成の運転監視装置が提案されてい
る。
[0005] As described in Japanese Patent Publication No. 57-21924, in FIGS. 15 and 16, notched grooves are provided at both axial ends of the teeth 2 of the stator 1 to form a pair of detection coils 10a. , 10b, and both detection coils 10a
, 10b are connected in series via rectifier circuits 11a, 11b and connected to the indicator 8.

【0006】この運転監視装置では、回転子4の軸方向
移動に連れて、両検出コイル10a ,10b に誘起される電
圧の整流後の電圧が変化し、すなわち図17に示すよう
に、正回転時には検出コイル10a の整流後の電圧がFcw
、検出コイル10b の整流後の電圧がRcw 、両者の差動
合成電圧がFcw −Rcw で示す曲線となり、逆正回転時に
は検出コイル10a の整流後の電圧がFccw、検出コイル10
b の整流後の電圧がRccw、両者の差動合成電圧がFccw−
Rccwで示す曲線となるので、指示器8としてのセンター
ゼロの電圧計の目盛りを図18に示すように形成するこ
とにより、軸受9a,9b の軸方向摩耗とその方向および
回転子4の回転方向を検出できる。
In this operation monitoring device, the rectified voltage of the voltage induced in the two detection coils 10a and 10b changes as the rotor 4 moves in the axial direction, that is, as shown in FIG. Sometimes the rectified voltage of the detection coil 10a is Fcw
The rectified voltage of the detection coil 10b is represented by Rcw, and the differential combined voltage of the two is a curve represented by Fcw−Rcw, and the voltage after rectification of the detection coil 10a is Fccw and the detection coil 10
The rectified voltage of b is Rccw, and the differential combined voltage of both is Fccw−
Since the curve shown by Rccw is obtained, the scale of the center zero voltmeter as the indicator 8 is formed as shown in FIG. 18 so that the axial wear of the bearings 9a and 9b and their directions and the rotation direction of the rotor 4 are obtained. Can be detected.

【0007】また、特開平10−80103号公報に記
載されているように、図19ないし図21において、半
径方向摩耗検出用として、固定子1の歯部2の軸方向一
端部に空間角で180度離して一対の検出コイル12a ,
12b を設け、軸方向他端部に空間角で180度離して一
対の検出コイル13a ,13b を設けてこれら両検出コイル
12a ,12b および13a ,13b の差動出力結線回路を整流
素子D1,D2を介して並列に接続し、この並列回路に直列
に指示器8を接続した検出回路を備え、軸方向摩耗検出
用として、固定子1の歯部2の軸方向一端部に空間角で
180度離した2個の検出コイル14a ,14b と軸方向他
端部に空間角で180度離した2個の検出コイル15a ,
15b を設け、歯部2の軸方向両端でそれぞれ対向する各
検出コイル14a ,15a および14b ,15b をそれぞれ一対
の検出コイルとして差動出力結線回路を形成し、この両
差動出力結線回路を直列に接続してこの直列回路に整流
素子D3を介して指示器8を接続した検出回路を備えたキ
ャンドモータの運転監視装置が提案されている。
[0007] As described in Japanese Patent Application Laid-Open No. 10-80103, in FIGS. 19 to 21, one end of the tooth portion 2 of the stator 1 in the axial direction has a spatial angle for detecting wear in the radial direction. 180 degrees apart, a pair of detection coils 12a,
12b, and a pair of detection coils 13a and 13b are provided at the other end in the axial direction at a space angle of 180 degrees, and these two detection coils are provided.
A differential output connection circuit of 12a, 12b and 13a, 13b is connected in parallel via rectifiers D1, D2, and a detection circuit in which an indicator 8 is connected in series with this parallel circuit is provided for detecting wear in the axial direction. , Two detection coils 14a, 14b spaced 180 degrees apart from each other in the axial direction of the tooth portion 2 of the stator 1 and two detection coils 15a separated by 180 degrees in the space angle from the other end in the axial direction.
A differential output connection circuit is formed as a pair of detection coils, each of the detection coils 14a, 15a and 14b, 15b opposed to each other at both axial ends of the tooth portion 2, and these two differential output connection circuits are connected in series. And a canned motor operation monitoring device provided with a detection circuit in which an indicator 8 is connected to this series circuit via a rectifying element D3.

【0008】この運転監視装置では、図10ないし図1
2に示す運転監視装置の場合と同様にして、回転子4の
半径方向変位あるいは傾斜状変位に応じて、半径方向摩
耗検出用の並列回路を構成する各検出コイル12a ,12b
および13a ,13b に生じる誘起電圧のうち特に高調波成
分が変化し、基本波成分が打消されて高調波成分の瞬時
値の合成値が検出され、その検出電圧が図22に示すよ
うに変化するので、前後の軸受9a ,9b の半径方向摩耗
および片側の軸受9a または9b の半径方向摩耗が検知で
きる。さらに、図15および図16に示す運転監視装置
の場合と同様にして、回転子4の軸方向変位に応じて、
軸方向摩耗検出用の直列回路を構成する各検出コイル14
a ,15a および14b ,15b に生じる誘起電庄が変化して
検出コイル14a ,15a の差動出力と検出コイル14b ,15
b の差動出力の和が図23に示すように変化するので、
軸受9a ,9b の軸方向摩耗が検知できる。
In this operation monitoring device, FIGS.
2, the detection coils 12a, 12b constituting a parallel circuit for detecting radial wear in accordance with the radial displacement or the inclined displacement of the rotor 4.
In particular, the harmonic component of the induced voltages generated in the signals 13a and 13b changes, the fundamental wave component is canceled, and the composite value of the instantaneous value of the harmonic component is detected, and the detected voltage changes as shown in FIG. Therefore, the radial wear of the front and rear bearings 9a and 9b and the radial wear of the bearing 9a or 9b on one side can be detected. Further, as in the case of the operation monitoring device shown in FIGS. 15 and 16, in accordance with the axial displacement of the rotor 4,
Each detection coil 14 constituting a series circuit for detecting axial wear
a, 15a and the induced voltage generated at 14b, 15b changes, and the differential outputs of the detection coils 14a, 15a and the detection coils 14b, 15b
Since the sum of the differential outputs of b changes as shown in FIG.
Axial wear of the bearings 9a and 9b can be detected.

【0009】また、特開平11−148819号公報に
記載されているように、図19ないし図21に示す構成
における軸方向摩耗検知の検出回路を、図24に示すよ
うに、各検出コイル対14a ,14b および15a ,15b の直
列回路をそれぞれ整流回路16a ,16b を介して増幅器な
どのレベル調整手段17a ,17b に接続し、その出力を差
動増幅器18で比較してその電圧差を絶対値回路19を介し
て図示しない指示器に指示させる運転監視装置が提案さ
れている。
As described in Japanese Patent Application Laid-Open No. H11-148819, a detection circuit for detecting axial wear in the configuration shown in FIG. 19 to FIG. , 14b and the series circuit of 15a, 15b are connected to level adjusting means 17a, 17b such as amplifiers via rectifier circuits 16a, 16b, respectively, and their outputs are compared by a differential amplifier 18, and the voltage difference is compared with the absolute value circuit. An operation monitoring device for instructing an indicator (not shown) via 19 has been proposed.

【0010】この運転監視装置では、レベル調整手段17
a ,17b にて両検出コイル14a ,14b および15a ,15b
の出力信号を同一レベルに設定することによって運転監
視装置の軸方向ゼロ点を固定子1と回転子4との中心位
置に対応させることができ、すなわち図25に示すよう
に、固定子1と回転子4の軸方向中心位置が一致すると
き(メカニカルセンタ)に固定子1の歯部2の一端側の
検出コイル14a ,14bの出力電圧曲線と他端側の検出コ
イル15a ,15b の出力電圧曲線とが交差する運転監視装
置の軸方向ゼロ点(マグネットセンタ)がメカニカルセ
ンタに一致しない場合は、両検出コイル14a ,14b およ
び15a ,15b の出力レベルをレベル調整手段17a ,17b
によってそれぞれ調整して同一レベルに設定することに
より、図26に示すように、運転監視装置のゼロ点(マ
グネットセンタ)をメカニカルセンタに一致させること
ができ、メカニカルセンタとマグネットセンタのずれに
よる軸受軸方向摩耗の検出精度を改善することができ
る。
In this operation monitoring device, the level adjusting means 17
a and 17b, both detection coils 14a and 14b and 15a and 15b
Can be made to correspond to the center position of the stator 1 and the rotor 4 by setting the output signal of the same to the same level, that is, as shown in FIG. When the axial center positions of the rotor 4 coincide (mechanical center), the output voltage curves of the detection coils 14a and 14b on one end of the tooth portion 2 of the stator 1 and the output voltages of the detection coils 15a and 15b on the other end. If the axial zero point (magnet center) of the operation monitoring device where the curve intersects does not coincide with the mechanical center, the output levels of both detection coils 14a, 14b and 15a, 15b are adjusted by level adjusting means 17a, 17b.
26, the zero point (magnet center) of the operation monitoring device can be made to coincide with the mechanical center as shown in FIG. 26, and the bearing shaft due to the displacement between the mechanical center and the magnet center can be adjusted. The detection accuracy of directional wear can be improved.

【0011】[0011]

【発明が解決しようとする課題】このように、キャンド
モータの固定子の歯部に検出コイルを設け、回転子の半
径方向位置および軸方向位置の変位を検知して軸受の半
径方向摩耗および軸方向摩耗を検出する手段が種々提案
されているがそれぞれ次のような問題がある。
As described above, the detection coil is provided on the tooth portion of the stator of the canned motor, and the radial and axial displacements of the rotor are detected to detect the radial wear of the bearing and the shaft. Various means for detecting directional wear have been proposed, but each has the following problems.

【0012】すなわち、一般にキャンドモータにおける
軸受の軸方向摩耗許容値は1.0mm程度であるのに対
して半径方向摩耗許容値は0.3mm程度であるため
に、軸受の半径方向摩耗検出についてはより高い検出感
度、特に摩耗初期値に対する摩耗限界値の信号比が求め
られるが、検出コイルの誘起電圧を高めるために検出コ
イルの巻数を増すと固定子1の固定子巻線20が収納され
る固定子溝21の占積率が高くなって検出コイルを収める
作業が困難になり、逆に検出コイルの巻数が少ないと検
出感度が低くなるとともにキャンドモータの負荷変動が
検出精度に影響する問題がある。
That is, in general, the allowable value of the axial wear of the bearing in the canned motor is about 1.0 mm, while the allowable value of the radial wear of the bearing is about 0.3 mm. A higher detection sensitivity, particularly a signal ratio of a wear limit value to an initial wear value, is required. However, when the number of turns of the detection coil is increased to increase the induced voltage of the detection coil, the stator winding 20 of the stator 1 is housed. As the space factor of the stator groove 21 increases, it becomes difficult to accommodate the detection coil.On the other hand, if the number of turns of the detection coil is small, the detection sensitivity decreases and the load fluctuation of the canned motor affects the detection accuracy. is there.

【0013】また、軸受の軸方向摩耗検出においては、
キャンドモータの負荷変化によって検出値が大幅に変化
するので、キャンドモータの負荷が略一定でないと軸受
摩耗が正確に検知できない問題がある。
[0013] In the detection of the axial wear of the bearing,
Since the detected value greatly changes due to a change in the load of the canned motor, there is a problem that bearing wear cannot be accurately detected unless the load of the canned motor is substantially constant.

【0014】そこで、このような問題を解決すべく、本
発明者は、軸受の軸方向摩耗検出時にキャンドモータの
負荷変化によって検出値が大幅に変化するのは回転子溝
の傾き(以下、スキューという)に原因があることを研
究により確認した。なお、回転子溝のスキューは、回転
子溝の存在による不整現象や脈動電圧などを減少して磁
気空隙の磁気抵抗の変化を緩和し、始動時の異常現象な
どの特性を改善するために採用されている。
In order to solve such a problem, the inventor of the present invention has proposed that when the axial wear of the bearing is detected, the detected value greatly changes due to a change in the load of the canned motor because the inclination of the rotor groove (hereinafter referred to as skew). Research has confirmed that there is a cause. The skew of the rotor groove is adopted to reduce irregularities and pulsation voltage due to the presence of the rotor groove, reduce the change in the magnetic resistance of the magnetic gap, and improve characteristics such as abnormal phenomena at startup. Have been.

【0015】すなわち、図15に示すように回転子4の
回転子溝6にスキューがあると、図27に示すように、
スキューされた回転子導体22に流れる電流I2のベクトル
成分Iaはトルクの発生に寄与するが、ベクトル成分Ibは
トルクの発生に寄与せず、その電流成分Ibによって生じ
る交差磁界によって、図28に示すように、主磁界を歪
める作用を及ぼし、一端側の主磁束が減磁され、多端側
の主磁束が増磁される結果となる。
That is, if there is a skew in the rotor groove 6 of the rotor 4 as shown in FIG. 15, as shown in FIG.
The vector component Ia of the current I2 flowing through the skewed rotor conductor 22 contributes to the generation of the torque, but the vector component Ib does not contribute to the generation of the torque, as shown in FIG. 28 by the cross magnetic field generated by the current component Ib. Thus, the effect of distorting the main magnetic field is exerted, so that the main magnetic flux on one end side is demagnetized, and the main magnetic flux on the multi-end side is increased.

【0016】この主磁束の軸方向不平衡によって、図2
5に示すように、固定子1と回転子4との軸方向中心が
一致する位置(メカニカルセンタ)に対して軸方向摩耗
検出装置の軸方向ゼロ点(マグネットセンタ)がずれる
のであるが、図24に示すレベル調整手段17a ,17b に
てマグネットセンタをメカニカルセンタに一致させて
も、キャンドモータの負荷変化によって回転子導体22に
流れる電流I2が変化して電流成分Ibも変化するので主磁
界を歪める作用が変化し、図29に示すように、各検出
コイル10a ,10b に誘起される電圧が大きく変化するの
で、軸受9a ,9bの軸方向摩耗検出値が大幅に変化する
こととなる。
Due to the axial imbalance of the main magnetic flux, FIG.
As shown in FIG. 5, the axial zero point (magnet center) of the axial wear detector is shifted from the position (mechanical center) where the axial centers of the stator 1 and the rotor 4 coincide. Even when the magnet center is made to coincide with the mechanical center by the level adjusting means 17a and 17b shown in FIG. 24, the current I2 flowing through the rotor conductor 22 changes due to the load change of the canned motor, and the current component Ib also changes. As shown in FIG. 29, the distorting action changes, and the voltage induced in each detection coil 10a, 10b greatly changes, so that the axial wear detection value of the bearings 9a, 9b greatly changes.

【0017】そこで、回転子溝6のスキューをなくせば
回転子導体22に流れる電流I2のベクトル成分Ibがゼロと
なって、この電流成分Ibによる交鎖磁界が主磁界を歪め
る作用が消滅し、そのためキャンドモータの負荷変化に
よる主磁界の変化がなくなるので、キャンドモータの負
荷変化による軸受9a ,9b の軸方向摩耗検出値に変化が
生じず検出精度が向上し、併せて回転子溝6がスキュー
しているために、軸受9a ,9b の半径方向検出用の検出
コイルに誘起される電圧変化の軸受摩耗に対する傾きが
増大して検出感度が向上されるとの技術的思想に到達し
た。
If the skew of the rotor groove 6 is eliminated, the vector component Ib of the current I2 flowing through the rotor conductor 22 becomes zero, and the effect of the cross-linked magnetic field by this current component Ib distorting the main magnetic field disappears. As a result, there is no change in the main magnetic field due to the change in the load of the canned motor, so that the detection value of the axial wear of the bearings 9a and 9b does not change due to the change in the load of the canned motor, and the detection accuracy is improved. As a result, the technical idea is reached that the inclination of the voltage change induced in the detection coils for detecting the radial direction of the bearings 9a and 9b with respect to the bearing wear increases and the detection sensitivity is improved.

【0018】本発明は、このような技術思想に基づき、
回転子溝の傾きをなくすことにより、軸受の半径方向摩
耗の検出感度を向上でき、軸受の軸方向摩耗の検出値が
キャンドモータの負荷変化に影響を受けずに検出精度を
向上できるキャンドモータ装置を提供することを目的と
する。
The present invention is based on such a technical idea,
Eliminating the inclination of the rotor groove improves the detection sensitivity of radial wear of the bearing, and improves the detection accuracy of the detected value of axial wear of the bearing without being affected by the load change of the canned motor. The purpose is to provide.

【0019】[0019]

【課題を解決するための手段】本発明のキャンドモータ
装置は、円筒状の固定子鉄心の内周に沿って複数の歯部
を設けた固定子、この固定子内に回転自在に配設され回
転子鉄心の外周に沿って複数の回転子溝を軸方向に平行
状に設けた回転子、および回転子を支承する軸受を有す
るキャンドモータと、前記固定子の歯部側にこの固定子
の軸心に対して180度離して設けた少なくとも一対の
半径方向検出コイル、および固定子の軸方向両端側に設
けた少なくとも一対の軸方向検出コイルを有し、前記半
径方向検出コイルの出力信号に基づいて、前記回転子の
半径方向変位から前記軸受の半径方向摩耗を監視すると
ともに、前記軸方向検出コイルの出力信号に基づいて、
前記回転子の軸方向変位から前記軸受の軸方向摩耗を監
視する運転監視装置とを備えているものである。
SUMMARY OF THE INVENTION A canned motor device according to the present invention has a stator having a plurality of teeth provided along an inner periphery of a cylindrical stator core, and is rotatably disposed in the stator. A rotor having a plurality of rotor grooves provided in parallel in the axial direction along the outer circumference of the rotor core, and a canned motor having a bearing for supporting the rotor; and a stator having the stator on the tooth side of the stator. At least one pair of radial detection coils provided 180 degrees apart from the axis, and at least one pair of axial detection coils provided at both axial ends of the stator, the output signal of the radial detection coil Monitoring the radial wear of the bearing from the radial displacement of the rotor, based on the output signal of the axial detection coil,
An operation monitoring device for monitoring the axial wear of the bearing from the axial displacement of the rotor.

【0020】そして、この構成により、キャンドモータ
の回転子の回転子溝を軸方向に平行状に設けることで、
回転子溝の傾きをなくしたことにより、回転子溝の傾き
の影響をなくし、軸受の半径方向摩耗検出に関しては、
回転子溝に傾きがある場合に比べて、半径方向検出コイ
ルの出力電圧は摩耗初期値のときには略同じであるが、
摩耗限界値に達したときには数倍増大して検出感度が向
上し、また、軸受の軸方向摩耗検出に関しては、キャン
ドモータの負荷変化に係わらず軸方向検出コイルの出力
電圧は殆ど変化せず検出精度が向上する。
With this configuration, the rotor groove of the canned motor rotor is provided in parallel with the axial direction,
By eliminating the inclination of the rotor groove, the influence of the inclination of the rotor groove is eliminated, and for the detection of bearing wear in the radial direction,
Compared to the case where the rotor groove is inclined, the output voltage of the radial direction detection coil is almost the same at the time of wear initial value,
When the wear limit is reached, the detection sensitivity is improved by several times and the detection sensitivity is improved.In the detection of bearing axial wear, the output voltage of the axial detection coil hardly changes regardless of the load change of the canned motor, and the detection accuracy is improved. improves.

【0021】[0021]

【発明の実施の形態】以下、本発明のキャンドモータ装
置の一実施の形態を図面を参照して説明する。
DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the canned motor device of the present invention will be described below with reference to the drawings.

【0022】図1ないし図5において、30はキャンドモ
ータポンプで、このキャンドモータポンプ30は、ポンプ
31とキャンドモータ32とを液密に一体に結合して構成さ
れている。
1 to 5, reference numeral 30 denotes a canned motor pump.
31 and a canned motor 32 are integrally connected in a liquid-tight manner.

【0023】キャンドモータ32は、円筒状の固定子鉄心
33の内周に沿って設けた複数の歯部34間の固定子溝35に
固定子巻線36が巻回されて構成される固定子37が固定子
枠38に挿入され、固定子37の内周面に固定子キャン39が
密着挿入されてその両端縁が固定子枠38の両フランジ内
径縁に液密に溶着され、また、円筒状の回転子鉄心40の
外周に沿って設けた複数の回転子溝41に回転子導体42が
装着されて構成される回転子43に回転軸44が挿着され、
回転子43の外周面に回転子キャン45が被着され、さら
に、回転子43が固定子キャン39と回転子キャン45とのキ
ャン隙間46を介して固定子37に対向配設され、回転軸44
が軸受箱47a ,47b に装着された例えば滑り軸受などの
軸受48a ,48b にてスリーブ49a ,49b およびスラスト
カラ50a ,50b を介して回転自在に支承されて構成され
ている。
The canned motor 32 has a cylindrical stator core.
A stator 37 formed by winding a stator winding 36 in a stator groove 35 between a plurality of teeth 34 provided along the inner circumference of 33 is inserted into a stator frame 38, and the A plurality of stator cans 39 are closely attached to the inner peripheral surface, and both end edges thereof are liquid-tightly welded to both flange inner diameter edges of the stator frame 38, and are provided along the outer periphery of the cylindrical rotor core 40. A rotating shaft 44 is inserted into a rotor 43 configured by mounting a rotor conductor 42 in a rotor groove 41 of
A rotor can 45 is attached to the outer peripheral surface of the rotor 43, and further, the rotor 43 is disposed opposite to the stator 37 via a can gap 46 between the stator can 39 and the rotor can 45, and a rotating shaft is provided. 44
Are rotatably supported by bearings 48a, 48b such as sliding bearings mounted on bearing boxes 47a, 47b via sleeves 49a, 49b and thrust collars 50a, 50b.

【0024】ポンプ31は、キャンドモータ32の固定子枠
に液密に取り付けられたケーシング51、このケーシング
51内で回転軸44に取り付けられたインペラ52を有してい
る。
The pump 31 includes a casing 51 which is mounted on the stator frame of the canned motor 32 in a liquid-tight manner,
Within 51, there is an impeller 52 attached to a rotating shaft 44.

【0025】次に、軸受48a ,48b の半径方向摩耗およ
び軸方向摩耗を検知する運転監視装置61について説明す
る。
Next, an operation monitoring device 61 for detecting radial wear and axial wear of the bearings 48a and 48b will be described.

【0026】図1、図2および図4に示すように、固定
子鉄心33の歯部34にこの固定子鉄心33の軸心に対して空
間角で180度離して歯部34の全長に亘って巻回して一
対の半径方向検出コイル62a ,62b を設け、これら両半
径方向検出コイル62a ,62bに固定子キャン39と回転子
キャン45およびキャン隙間46からなる磁気空隙63を隔て
て対向する回転子溝41との関係位置が同じくなるように
この回転子溝41の数を偶数に定め、両半径方向検出コイ
ル62a ,62b に誘起される電源周波数に同期した基本波
電圧と回転子溝41の数によって決定される周波数を持つ
高調波電圧に関して、基本波電圧が互いに打ち消されか
つ高調波電圧の瞬時値の合成値が検出されるように両半
径方向検出コイル62a ,62b を直列に接続して半径方向
摩耗検出部64(図5に示す)を構成する。そして、図5
に示すように、この半径方向摩耗検出部64の出力端に整
流回路65を接続し、必要に応じて増幅回路66を介して、
例えばアナログ電圧計やLEDランプによるレベルメー
タなどの指示器67に接続する。増幅回路66は、増幅度調
整用に可変抵抗器VR1 を、ゼロ点調整用に可変抵抗器VR
2 を備えている。
As shown in FIGS. 1, 2 and 4, the teeth 34 of the stator core 33 are separated from the axis of the stator 33 by a space angle of 180 degrees over the entire length of the teeth 34. A pair of radial detection coils 62a and 62b are provided, and these two radial detection coils 62a and 62b are opposed to each other by a magnetic gap 63 including a stator can 39, a rotor can 45, and a can gap 46. The number of the rotor grooves 41 is determined to be an even number so that the position relative to the rotor grooves 41 is the same. The two radial detection coils 62a and 62b are connected in series so that the fundamental voltage is canceled out from each other and the composite value of the instantaneous value of the harmonic voltage is detected with respect to the harmonic voltage having a frequency determined by the number. Constructs a radial wear detector 64 (shown in FIG. 5) . And FIG.
As shown in the figure, a rectifier circuit 65 is connected to the output end of the radial wear detector 64, and if necessary, via an amplifier circuit 66,
For example, it is connected to an indicator 67 such as an analog voltmeter or a level meter using an LED lamp. The amplifier circuit 66 includes a variable resistor VR1 for adjusting the amplification degree and a variable resistor VR for adjusting the zero point.
It has two.

【0027】また、図1ないし図4に示すように、固定
子37の歯部34の軸方向両端縁とその近傍に設けた切欠溝
68との間にそれぞれ歯部34を巻回する一対の軸方向検出
コイル69a ,69b を設けて軸方向摩耗検出部70(図5に
示す)を構成する。そして、図5に示すように、両軸方
向検出コイル69a ,69b のそれぞれの出力端に整流回路
71a ,71b を接続し、この両整流回路71a ,71b の出力
端にそれぞれ増幅回路72a ,72b を接続し、この両増幅
回路72a ,72b の出力端を差動増幅回路73に接続し、こ
の差動増幅回路73の出力端を絶対値回路74を介して、例
えばアナログ電圧計やLEDランプによるレベルメータ
などの指示器75に接続する。増幅回路72a ,72b は、増
幅度調整用に可変抵抗器VR3 ,VR5 を、ゼロ点調整用に
可変抵抗器VR4 ,VR6 を備えている。
As shown in FIGS. 1 to 4, notch grooves provided at both ends in the axial direction of the teeth 34 of the stator 37 and in the vicinity thereof.
A pair of axial detection coils 69a and 69b respectively wound around the teeth 34 are provided between the coil 68 and the shaft 68 to form an axial wear detector 70 (shown in FIG. 5). Then, as shown in FIG. 5, a rectifying circuit is connected to each output terminal of the biaxial direction detecting coils 69a and 69b.
71a, 71b are connected, the amplifiers 72a, 72b are connected to the output terminals of the rectifier circuits 71a, 71b, respectively, and the output terminals of the amplifier circuits 72a, 72b are connected to the differential amplifier circuit 73. The output terminal of the dynamic amplifying circuit 73 is connected via an absolute value circuit 74 to an indicator 75 such as an analog voltmeter or a level meter using an LED lamp. The amplifier circuits 72a and 72b include variable resistors VR3 and VR5 for adjusting the amplification degree, and variable resistors VR4 and VR6 for adjusting the zero point.

【0028】さらに、図1に示すように、キャンドモー
タ32の回転子溝41は、軸方向に平行状に形成し、傾き
(以下、スキューという)をゼロに設定する。
Further, as shown in FIG. 1, the rotor groove 41 of the canned motor 32 is formed parallel to the axial direction, and the inclination (hereinafter, referred to as skew) is set to zero.

【0029】次に、このように構成したキャンドモータ
ポンプ30の運転により、半径方向検出コイル62a ,62b
を有する半径方向摩耗検出部64には、各半径方向検出コ
イル62a ,62b に誘起される基本波電圧が打消されかつ
高調波電圧の瞬時値の差が出力されるが、回転子溝41の
スキューがゼロであるので、その検出感度、特に摩耗初
期値に対する摩耗限界値の信号比が従来に比べて向上す
る。
Next, the operation of the canned motor pump 30 configured as described above causes the radial direction detection coils 62a, 62b to operate.
The fundamental wear voltage induced in each of the radial detection coils 62a and 62b is canceled and the difference between the instantaneous values of the harmonic voltage is output to the radial wear detector 64 having the skew of the rotor groove 41. Is zero, the detection sensitivity, especially the signal ratio of the wear limit value to the wear initial value, is improved as compared with the prior art.

【0030】すなわち、図6において、実線は回転子溝
41のスキューがゼロ、点線はスキューが0.5スロット
ピッチ、1点鎖線はスキューが1.0スロットピッチ、
2点鎖線はスキューが1.3スロットピッチの場合にお
ける軸受48a ,48b の半径方向摩耗に対する半径方向摩
耗検出部64の検出電圧を実測したデータを示すが、スキ
ューが1.3スロットピッチから1.0スロットピッチ
および0.5スロットピッチと小さくなるに連れて検出
電圧変化の傾きが増し、スキューがゼロの場合は摩耗初
期値に対する摩耗限界値の信号比(検出感度)が約6倍
となってスキューがある場合に比べて大幅に増大するの
で、検出感度を上げるために半径方向検出コイル62a ,
62b の巻数を増す必要がなく、固定子巻線36が収納され
る固定子溝35の占領率が高くなって半径方向検出コイル
62a ,62b を収める作業が困難になる問題が解消され、
および検出感度が低いことに起因してキャンドモータ32
の負荷変動が検出精度に影響する問題が解消される。
That is, in FIG. 6, the solid line represents the rotor groove.
41 has zero skew, the dotted line has a skew of 0.5 slot pitch, the dashed line has a skew of 1.0 slot pitch,
The two-dot chain line shows data obtained by actually measuring the detection voltage of the radial wear detector 64 with respect to the radial wear of the bearings 48a and 48b when the skew is 1.3 slot pitch. The slope of the detected voltage change increases as the slot pitch becomes smaller as 0 slot pitch and 0.5 slot pitch. When the skew is zero, the signal ratio (detection sensitivity) of the wear limit value to the wear initial value becomes about 6 times. Since the skew is greatly increased as compared with the case where there is skew, the radial direction detection coils 62a,
There is no need to increase the number of turns of 62b, and the occupation rate of the stator groove 35 in which the stator winding 36 is housed increases, and the radial detection coil
The problem that the work of storing 62a and 62b becomes difficult has been solved,
And cand motor 32
The problem that the load fluctuation of (1) affects the detection accuracy is solved.

【0031】また、軸方向摩耗検出部70の軸方向検出コ
イル69a ,69b には、固定子巻線36に流れる励磁電流に
よる磁束が両軸方向検出コイル69a ,69b に鎖交して電
圧が誘起され、前側の軸受48a または後側の軸受48b の
軸方向摩耗によって回転子43が軸方向に移動すると、一
方の軸方向検出コイル69a または69b に誘起される電圧
が増加し、他方の軸方向検出コイル69b または69a に誘
起される電圧が減少するが、回転子溝41にスキューが設
けられていないので、図7に示すように、各軸方向検出
コイル69a ,69b の整流後の電圧曲線の交点、すなわち
軸方向ゼロ点(マグネットセンタ)が固定子37の軸方向
中心と回転子43の軸方向中心が一致した点(メカニカル
センタ)の略近傍になり、また、キャンドモータ32の負
荷変化によっても検出値が変化しないようになる。
In the axial direction detecting coils 69a and 69b of the axial direction wear detecting section 70, the magnetic flux generated by the exciting current flowing through the stator winding 36 interlinks the two axial direction detecting coils 69a and 69b to generate a voltage. When the rotor 43 moves in the axial direction due to axial wear of the front bearing 48a or the rear bearing 48b, the voltage induced in one of the axial detection coils 69a or 69b increases, and the other in the axial detection. Although the voltage induced in the coil 69b or 69a is reduced, the skew is not provided in the rotor groove 41. Therefore, as shown in FIG. 7, the intersection of the rectified voltage curves of the respective axial detection coils 69a and 69b, as shown in FIG. That is, the zero point in the axial direction (magnet center) is substantially in the vicinity of the point (mechanical center) where the axial center of the stator 37 and the axial center of the rotor 43 coincide with each other. The detected value does not change To become.

【0032】すなわち、図7において、実線は回転子溝
41のスキューがゼロ、点線はスキューが1.0スロット
ピッチ、1点鎖線はスキューが1.3スロットピッチの
場合におけるそれぞれ固定子37の軸方向中心に対する回
転子43の軸方向中心の位置変化に対する各軸方向検出コ
イル69a ,69b に誘起される電圧の整流後の電圧を測定
したデータを示し、この電圧曲線の交点(マグネットセ
ンタ)は、スキューがゼロの場合は固定子37の中心と回
転子43の中心が一致する位置(メカニカルセンタ)から
約0.6mm離れた位置にくるが、スキューが1.0ス
ロットピッチの場合はメカニカルセンタから約3.3m
m離れ、スキューが1.3スロットピッチの場合はメカ
ニカルセンタから約5.0mm離れた位置にくる。
That is, in FIG. 7, the solid line is the rotor groove.
The skew of 41 is zero, the dotted line is the skew of 1.0 slot pitch, and the dashed line is the skew of 1.3 slot pitch with respect to the change in the position of the axial center of the rotor 43 with respect to the axial center of the stator 37. This figure shows data obtained by measuring the rectified voltage of the voltage induced in each of the axial direction detection coils 69a and 69b. The intersection (magnet center) of this voltage curve indicates the center of the stator 37 and the rotor when the skew is zero. The center of 43 is about 0.6 mm away from the position where the center coincides (mechanical center), but when the skew is 1.0 slot pitch, it is about 3.3 m from the mechanical center.
m, and the skew is 1.3 slot pitch, the position is about 5.0 mm away from the mechanical center.

【0033】なお、スキューがゼロの場合にメカニカル
センタとマグネットセンタが一致しないのは、両軸方向
検出コイル69a ,69b のインダクタンスの若干の相違や
固定子溝35の漏れ磁束の若干の不平衡によって生じるも
のであり、増幅回路72a ,72b の可変抵抗器VR3 とVR5
またはVR4とVR6により信号電圧を増減またはゼロ点調整
することにより一致させるように調整すればよい。
When the skew is zero, the mechanical center and the magnet center do not coincide with each other because of a slight difference in inductance between the two axial detection coils 69a and 69b and a slight imbalance in the leakage magnetic flux of the stator groove 35. And the variable resistors VR3 and VR5 of the amplifier circuits 72a and 72b.
Alternatively, the signal voltages may be adjusted so as to match by increasing or decreasing or zero-adjusting the signal voltages by VR4 and VR6.

【0034】また、図8において、実線は回転子溝41の
スキューがゼロ、1点鎖線はスキューが1.3スロット
ピッチの場合におけるキャンドモータ32の負荷電流変化
に対する各軸方向検出コイル69a ,69b に誘起される電
圧の整流後の電圧差の実測データを示し、スキューが
1.3スロットピッチの場合はキャンドモータ32の負荷
電流が28Aから38Aへと変化すると、電圧差は0.
12Vから0.17Vへと約40%増加するが、スキュ
ーがゼロの場合は0.03Vで一定であり、従って、軸
受48a ,48b の軸方向摩耗検出はキャンドモータ32の負
荷変化に影響を受けない。
In FIG. 8, the solid line indicates the skew of the rotor groove 41 is zero, and the chain line indicates the axial detection coils 69a and 69b with respect to the change in the load current of the canned motor 32 when the skew is 1.3 slot pitch. FIG. 5 shows actual measurement data of a voltage difference after rectification of a voltage induced in the canned motor. When the skew is 1.3 slot pitch, when the load current of the canned motor 32 changes from 28 A to 38 A, the voltage difference becomes 0.
It increases by about 40% from 12 V to 0.17 V, but is constant at 0.03 V when the skew is zero, so that the detection of the axial wear of the bearings 48 a and 48 b is affected by the load change of the canned motor 32. Absent.

【0035】このように、キャンドモータ32の回転子43
の回転子溝41を軸方向に平行状に設け、すなわち回転子
溝41のスキューをなくし、半径方向検出コイル62a ,62
b および軸方向検出コイル69a ,69b の出力信号に基づ
いて、回転子43の半径方向変位および軸方向変位から軸
受48a ,48b の半径方向摩耗および軸方向摩耗を監視す
るので、回転子溝41のスキューの影響をなくし、軸受48
a ,48b の半径方向摩耗の検出感度、特に摩耗初期値に
対する摩耗限界値の信号比を向上でき、軸受48a ,48b
の軸方向摩耗の検出値がキャンドモータ32の負荷変化に
影響を受けず軸方向摩耗の検出精度を向上できる。
As described above, the rotor 43 of the canned motor 32
The rotor grooves 41 are provided in parallel in the axial direction, that is, the skew of the rotor grooves 41 is eliminated, and the radial direction detection coils 62a, 62
Since the radial wear and the axial wear of the bearings 48a and 48b are monitored from the radial displacement and the axial displacement of the rotor 43 on the basis of the output signals of the rotor groove 41 and the rotor grooves 41 based on the output signals of the rotor 43 and the axial detection coils 69a and 69b. Eliminate the effects of skew, and use bearings 48
a, 48b can improve the detection sensitivity of the radial wear, especially the signal ratio of the wear limit value to the initial wear value, and the bearings 48a, 48b
Thus, the detection value of the axial wear can be improved without being affected by the load change of the canned motor 32.

【0036】なお、前記実施の形態においては、半径方
向軸受摩耗を検出する半径方向検出コイル62a ,62b を
固定子37の歯部34に空間角で180度離して歯部34の全
長に亘って巻回して一対の半径方向検出コイル62a ,62
b を構成したが、同様に構成した半径方向検出コイル対
を複数設けて、この複数対の検出コイルを並列に比較器
に接続して出力電圧の最も大きいものを出力させる構成
をとってもよく、また、固定子37の歯部34の軸方向両端
にそれぞれ一対の半径方向検出コイルを設けてこの両検
出コイル対の差動出力結線回路を整流素子を介して並列
に接続して両者の出力信号の大きい方を検出信号として
取出してもよい。
In the above embodiment, the radial direction detecting coils 62a and 62b for detecting the radial bearing wear are separated from the tooth portions 34 of the stator 37 by a space angle of 180 degrees over the entire length of the tooth portions 34. Wound to form a pair of radial detection coils 62a, 62
Although b is configured, a plurality of similarly-configured radial direction detection coil pairs may be provided, and a configuration may be adopted in which the plurality of pairs of detection coils are connected in parallel to a comparator to output the one having the largest output voltage, A pair of radial detection coils are provided at both ends in the axial direction of the tooth portion 34 of the stator 37, and the differential output connection circuits of the two detection coil pairs are connected in parallel via a rectifying element, so that the output signals of both of them are output. The larger one may be taken out as the detection signal.

【0037】また、前記実施の形態においては、軸方向
摩耗を検出する軸方向検出コイル69a ,69b を固定子37
の歯部34の軸方向両端部に設けて一対の軸方向検出コイ
ル69a ,69b を構成したが、同様の検出コイル対を複数
設けてその出力信号の和を検出信号として取出してもよ
い。
In the above embodiment, the axial detecting coils 69a and 69b for detecting the axial wear are connected to the stator 37.
Although a pair of axial detection coils 69a and 69b are provided at both ends in the axial direction of the tooth portion 34, a plurality of similar detection coil pairs may be provided and the sum of output signals thereof may be extracted as a detection signal.

【0038】さらに、半径方向検出コイル62a ,62b お
よび軸方向検出コイル69a ,69b は、固定子37の歯部34
に巻回する手段の他に、図9に示すように、歯部34の軸
方向端部を切り欠いてこの切欠部にコの字状のヨーク81
を装着し、このヨーク81に検出コイル82を巻回して構成
しても、同様の作用効果が得られる。
Further, the radial direction detecting coils 62a, 62b and the axial direction detecting coils 69a, 69b are connected to the teeth 34 of the stator 37.
As shown in FIG. 9, the axial end of the tooth portion 34 is cut out, and a U-shaped yoke 81 is formed in the cutout.
The same operation and effect can be obtained even if the detection coil 82 is wound around the yoke 81.

【0039】[0039]

【発明の効果】本発明のキャンドモータ装置によれば、
キャンドモータの回転子の回転子溝を軸方向に平行状に
設け、すなわち回転子溝の傾きをなくし、半径方向検出
コイルおよび軸方向検出コイルの出力信号に基づいて、
回転子の半径方向変位および軸方向変位から軸受の半径
方向摩耗および軸方向摩耗を監視するので、回転子溝の
傾きの影響をなくし、軸受の半径方向摩耗の検出感度、
特に摩耗初期値に対する摩耗限界値の信号比を向上で
き、軸受の軸方向摩耗の検出値がキャンドモータの負荷
変化に影響を受けず軸方向摩耗の検出精度を向上でき
る。
According to the canned motor device of the present invention,
The rotor groove of the rotor of the canned motor is provided parallel to the axial direction, that is, the inclination of the rotor groove is eliminated, and based on the output signals of the radial direction detection coil and the axial direction detection coil,
Since the radial wear and axial wear of the bearing are monitored from the radial displacement and axial displacement of the rotor, the influence of the inclination of the rotor groove is eliminated, and the detection sensitivity of the bearing radial wear,
In particular, the signal ratio of the wear limit value to the wear initial value can be improved, and the detection value of the axial wear of the bearing is not affected by the load change of the canned motor, so that the detection accuracy of the axial wear can be improved.

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

【図1】本発明のキャンドモータ装置の一実施の形態を
示すキャンドモータポンプの横断面図(図2のB−B断
面図)である。
FIG. 1 is a cross-sectional view (a cross-sectional view taken along the line BB of FIG. 2) of a canned motor pump showing one embodiment of a canned motor device of the present invention.

【図2】同上キャンドモータポンプの縦断面図(図1の
A−A断面図)である。
FIG. 2 is a longitudinal sectional view (AA sectional view of FIG. 1) of the same canned motor pump.

【図3】同上固定子に対する軸方向検出コイルの取付状
態を示す部分拡大斜視図である。
FIG. 3 is a partially enlarged perspective view showing an attached state of an axial direction detection coil to the stator.

【図4】同上固定子に対する半径方向検出コイルおよび
軸方向検出コイルの配置を示す説明図である。
FIG. 4 is an explanatory diagram showing an arrangement of a radial direction detection coil and an axial direction detection coil with respect to the stator.

【図5】同上運転監視装置の回路図である。FIG. 5 is a circuit diagram of the operation monitoring device.

【図6】同上運転監視装置において、回転子溝のスキュ
ーをパラメータとして軸受の半径方向摩耗量に対する半
径方向摩耗検出部の検出電圧特性を実測したグラフであ
る。
FIG. 6 is a graph showing a measured voltage characteristic of a radial wear detector with respect to a radial wear amount of a bearing using a skew of a rotor groove as a parameter in the operation monitoring device.

【図7】同上運転監視装置において、回転子溝のスキュ
ーをパラメータとして回転子の軸方向位置に対する軸方
向摩耗検出部の各軸方向検出コイルに誘起される電圧の
整流後の電圧特性を実測したグラフである。
FIG. 7 shows a measured voltage characteristic after rectification of a voltage induced in each axial detection coil of the axial wear detection unit with respect to the axial position of the rotor using the skew of the rotor groove as a parameter in the operation monitoring device. It is a graph.

【図8】同上運転監視装置において、回転子溝のスキュ
ーをパラメータとしてキャンドモータの負荷電流変化に
対する軸方向摩耗検出部の各軸方向検出コイルに誘起さ
れる電圧の整流後の電圧差特性を実測したグラフであ
る。
FIG. 8 In the operation monitoring device, a voltage difference characteristic after rectification of a voltage induced in each axial detection coil of the axial wear detection unit with respect to a change in load current of the canned motor is measured by using a skew of a rotor groove as a parameter. It is the graph which did.

【図9】同上各検出コイルの取付状態の他の実施の形態
を示す部分拡大斜視図である。
FIG. 9 is a partially enlarged perspective view showing another embodiment of the mounting state of each of the detection coils.

【図10】従来の軸受の半径方向摩耗を検出する運転監
視装置を採用したモータの横断面図である。
FIG. 10 is a cross-sectional view of a motor employing a conventional operation monitoring device for detecting radial wear of a bearing.

【図11】同上縦断面図である。FIG. 11 is a longitudinal sectional view of the same.

【図12】同上運転監視装置の回路図である。FIG. 12 is a circuit diagram of the operation monitoring device.

【図13】同上運転監視装置において軸受の半径方向摩
耗量と検出部の検出電圧との関係を示すグラフである。
FIG. 13 is a graph showing a relationship between a radial wear amount of a bearing and a detection voltage of a detection unit in the operation monitoring device.

【図14】同上運転監視装置においてモータの負荷電流
と検出部の検出電圧との関係を示すグラフである。
FIG. 14 is a graph showing a relationship between a load current of a motor and a detection voltage of a detection unit in the operation monitoring device.

【図15】他の従来の軸受の軸方向摩耗を検出する運転
監視装置を採用したモータの横断面図である。
FIG. 15 is a cross-sectional view of a motor employing another conventional operation monitoring device for detecting axial wear of a bearing.

【図16】同上運転監視装置の回路図である。FIG. 16 is a circuit diagram of the operation monitoring device.

【図17】同上運転監視装置において回転子の軸方向位
置変位と検出コイルに誘起される電圧の整流後の電圧と
の関係を示すグラフである。
FIG. 17 is a graph showing the relationship between the axial displacement of the rotor and the rectified voltage of the voltage induced in the detection coil in the operation monitoring device.

【図18】同上運転監視装置の指示器を示す正面図であ
る。
FIG. 18 is a front view showing an indicator of the operation monitoring device.

【図19】さらに他の従来の軸受の半径方向摩耗と軸方
向摩耗を検出する運転監視装置を採用したキャンドモー
タにおいて検出コイルの配置状態を示す説明図である。
FIG. 19 is an explanatory view showing a state of arrangement of a detection coil in a canned motor adopting another conventional operation monitoring device for detecting radial wear and axial wear of a bearing.

【図20】同上検出コイルの配置状態を示す縦断面図で
ある。
FIG. 20 is a longitudinal sectional view showing an arrangement state of the detection coil.

【図21】同上運転監視装置の回路図である。FIG. 21 is a circuit diagram of the operation monitoring device.

【図22】同上運転監視装置において回転子の半径方向
変位と検出コイルの差動出力の関係を示すグラフであ
る。
FIG. 22 is a graph showing a relationship between a radial displacement of a rotor and a differential output of a detection coil in the operation monitoring device.

【図23】同上運転監視装置において回転子の軸方向変
位と検出コイルの差動出力の和の関係を示すグラフであ
る。
FIG. 23 is a graph showing the relationship between the axial displacement of the rotor and the sum of the differential outputs of the detection coils in the operation monitoring device.

【図24】またさらに他の従来の運転監視装置において
マグネットセンタのゼロ点調整をするためのレベル調整
手段を設けた回路図である。
FIG. 24 is a circuit diagram of another conventional operation monitoring device provided with level adjusting means for adjusting the zero point of the magnet center.

【図25】同上運転監視装置においてゼロ点調整前の回
転子の軸方向変位と検出コイルの差動出力の関係を示す
グラフである。
FIG. 25 is a graph showing the relationship between the axial displacement of the rotor and the differential output of the detection coil before the zero point adjustment in the operation monitoring device.

【図26】同上運転監視装置においてゼロ点調整後の回
転子の軸方向変位と検出コイルの差動出力の関係を示す
グラフである。
FIG. 26 is a graph showing the relationship between the axial displacement of the rotor after the zero point adjustment and the differential output of the detection coil in the operation monitoring device.

【図27】従来の回転子に傾き(スキュー)があるモー
タにおいて、回転子導体に流れる電流成分を説明する説
明図である。
FIG. 27 is an explanatory diagram illustrating a current component flowing through a rotor conductor in a conventional motor having a tilt (skew) in the rotor.

【図28】同上モータの固定子の磁束分布を説明する説
明図である。
FIG. 28 is an explanatory diagram illustrating a magnetic flux distribution of a stator of the motor.

【図29】同上モータにおいて負荷電流変化に対する検
出コイル発生電圧の変化を示すグラフである。
FIG. 29 is a graph showing a change in a detection coil generation voltage with respect to a load current change in the motor.

【符号の説明】[Explanation of symbols]

32 キャンドモータ 33 固定子鉄心 34 歯部 37 固定子 40 回転子鉄心 41 回転子溝 43 回転子 48a ,48b 軸受 61 運転監視装置 62a ,62b 半径方向検出コイル 69a ,69b 軸方向検出コイル 32 Canned motor 33 Stator core 34 Tooth 37 Stator 40 Rotor core 41 Rotor groove 43 Rotor 48a, 48b Bearing 61 Operation monitoring device 62a, 62b Radial detection coil 69a, 69b Axial detection coil

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 円筒状の固定子鉄心の内周に沿って複数
の歯部を設けた固定子、この固定子内に回転自在に配設
され回転子鉄心の外周に沿って複数の回転子溝を軸方向
に平行状に設けた回転子、および回転子を支承する軸受
を有するキャンドモータと、 前記固定子の歯部側にこの固定子の軸心に対して180
度離して設けた少なくとも一対の半径方向検出コイル、
および固定子の軸方向両端側に設けた少なくとも一対の
軸方向検出コイルを有し、前記半径方向検出コイルの出
力信号に基づいて、前記回転子の半径方向変位から前記
軸受の半径方向摩耗を監視するとともに、前記軸方向検
出コイルの出力信号に基づいて、前記回転子の軸方向変
位から前記軸受の軸方向摩耗を監視する運転監視装置と
を備えていることを特徴とするキャンドモータ装置。
1. A stator having a plurality of teeth provided along an inner periphery of a cylindrical stator core, and a plurality of rotors rotatably disposed in the stator and arranged along the outer periphery of the rotor core. A canned motor having a rotor provided with grooves parallel to the axial direction, and a bearing for supporting the rotor; and a canned motor on the tooth side of the stator with respect to the axis of the stator.
At least one pair of radial detection coils provided apart from each other,
And at least one pair of axial detection coils provided at both ends of the stator in the axial direction, based on an output signal of the radial detection coil, for monitoring radial wear of the bearing from radial displacement of the rotor. And an operation monitoring device for monitoring the axial wear of the bearing from the axial displacement of the rotor based on the output signal of the axial detection coil.
JP32455399A 1999-11-15 1999-11-15 Canned motor device Pending JP2001145304A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP32455399A JP2001145304A (en) 1999-11-15 1999-11-15 Canned motor device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP32455399A JP2001145304A (en) 1999-11-15 1999-11-15 Canned motor device

Publications (1)

Publication Number Publication Date
JP2001145304A true JP2001145304A (en) 2001-05-25

Family

ID=18167108

Family Applications (1)

Application Number Title Priority Date Filing Date
JP32455399A Pending JP2001145304A (en) 1999-11-15 1999-11-15 Canned motor device

Country Status (1)

Country Link
JP (1) JP2001145304A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7314434B1 (en) * 2023-03-16 2023-07-25 日機装株式会社 Motor bearing wear state estimation device, bearing wear state estimation method, bearing wear state estimation program, and canned motor pump

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7314434B1 (en) * 2023-03-16 2023-07-25 日機装株式会社 Motor bearing wear state estimation device, bearing wear state estimation method, bearing wear state estimation program, and canned motor pump

Similar Documents

Publication Publication Date Title
US6078119A (en) Bearingless rotary machine
US8390277B2 (en) Rotational angle detector
JPS6052654B2 (en) Bearing wear detection device for AC rotating electric machines
JP5105029B2 (en) Winding method and structure of stator for rotation detector and electric motor having rotation detector
WO2016117430A1 (en) Turning angle detection device
EP0828152B1 (en) Canned-motor bearing abrasion monitor
US6731107B2 (en) Star-connected sensor
US7019661B2 (en) Axial bearing wear detection device for canned motor
JP2001304180A (en) Canned motor pump
JP2001145304A (en) Canned motor device
US10006784B2 (en) Rotational angle detecting device
US5394042A (en) Angular position homopolar reluctance sensor
JPH0865975A (en) Induction motor provided with detector for axial displacement of rotor
US6114966A (en) Motor having a bearing wear monitoring device
EP1489321A1 (en) Motor control system, motor apparatus, vacuum pump, correction current value measuring apparatus, and motor control method
JP3573248B2 (en) motor
EP3517896B1 (en) Contactless radial position sensor having improved response behavior to target defects
JPH11148819A (en) Adjustment method and device for axial zero point in bearing abrasion monitor of motor
JPH05130762A (en) Detector for axial runout and eccentricity of rotor of induction motor
JP3604276B2 (en) Induction motor and method of detecting wear of bearing thereof
JP2001157409A (en) Monitoring device for canned motor operation
JP6665239B2 (en) Rotation angle detector
JP4081566B2 (en) Canned motor pump
JP2000197312A (en) Canned motor operation monitoring device
JP2002051504A (en) Apparatus for detecting wear of axial direction bearing of canned motor

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20061018

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20090813

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20090826

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20091216