JP2006081338A - Rotor of rotary electric machine - Google Patents

Rotor of rotary electric machine Download PDF

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JP2006081338A
JP2006081338A JP2004263955A JP2004263955A JP2006081338A JP 2006081338 A JP2006081338 A JP 2006081338A JP 2004263955 A JP2004263955 A JP 2004263955A JP 2004263955 A JP2004263955 A JP 2004263955A JP 2006081338 A JP2006081338 A JP 2006081338A
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rotor
permanent magnet
rotor core
slit
electrical machine
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Minoru Arimitsu
稔 有満
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Nissan Motor Co Ltd
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Nissan Motor Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

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  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide the rotor of a rotary electric machine through which demagnetization of a permanent magnet is avoided and high temperature operation is realized. <P>SOLUTION: The rotor of a rotary electric machine comprises a disc-like rotor core 11, a plurality of permanent magnets 13 and 14 arranged on the rotor core 11 along the circumferential direction while changing the polarity alternately, and a plurality of first slits 15 formed in the rotor core 11 substantially in parallel with the flux of each permanent magnet 13, 14 while spaced apart from each other. Each permanent magnet 13, 14 has IPM (Interior Permanent Magnet) structure buried in the rotor core 11 and the plurality of first slits 15 are provided only on the outer circumferential side of each permanent magnet 13, 14. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

この発明は、回転電機のロータに関し、特に、永久磁石モータとして用いられる回転電機のロータに関する。   The present invention relates to a rotor of a rotating electrical machine, and more particularly to a rotor of a rotating electrical machine used as a permanent magnet motor.

従来、電気自動車用走行モータに用いられる回転電機が知られている。この回転電機は、ロータが磁気突極型ロータ部とマグネット型ロータ部を軸方向直列に結合した構造を持ち、磁気突極型ロータ部の磁気突極型界磁極の磁束とマグネット型ロータ部の永久磁石型界磁極の磁束とは、共通の多相電機子コイルと鎖交する構成を有している（特許文献１参照）。   2. Description of the Related Art Conventionally, a rotating electrical machine used for an electric vehicle traveling motor is known. This rotating electric machine has a structure in which a rotor is coupled in series in the axial direction with a magnetic salient pole type rotor part and a magnet type rotor part, and the magnetic salient pole type magnetic pole of the magnetic salient pole type rotor part and the magnetic rotor part The magnetic flux of the permanent magnet type field pole has a configuration that is linked to a common multiphase armature coil (see Patent Document 1).

つまり、ロータを複数に分割し、その内の一つを表面磁石構造（ＳＰＭ：Ｓｕｒｆａｃｅ Ｐｅｒｍａｎｅｎｔ Ｍａｇｎｅｔ）に近い永久磁石モータ、その他のものをリラクタンスモータとして、これら分割したロータをお互いにずらすことにより、全体として強め界磁でトルクを出す構造に近いものを実現している。
特開２００１−１１９８７５号公報 In other words, the rotor is divided into a plurality of parts, one of which is a permanent magnet motor close to the surface magnet structure (SPM), the other is a reluctance motor, and the divided rotors are shifted from each other. As a whole, a structure close to a structure that produces torque with a strong field is realized.
Japanese Patent Laid-Open No. 2001-11985

しかしながら、従来の回転電機の構成では、永久磁石モータとするロータに加わる磁界はｑ軸か−ｄ軸であり、より一層、磁石を高温で使うことは不可能である。つまり、永久磁石、特に汎用されている高ＢＨｍａｘのＮｅＦｅＢｒ系のものは、高温状態にあると、また、強い反磁界が加わると減磁が発生し、本来持っていた磁束を出すことができない。このため、永久磁石モータにおいては、永久磁石温度が減磁する温度を超えない範囲で、また、永久磁石に強い反磁界が加わらない状態で使用している。特に、永久磁石温度が減磁する温度を超えない範囲で使用することを考慮して、モータ冷却系の強化や、永久磁石を分割して可能な限り磁石が発熱しないようにする等の対策を必要とするため、コストが非常に高くなることが避けられなかった。   However, in the configuration of the conventional rotating electric machine, the magnetic field applied to the rotor serving as the permanent magnet motor is q-axis or −d-axis, and it is impossible to use the magnet at a higher temperature. That is, permanent magnets, especially those of the high FeHBr type with high BHmax, are demagnetized when a high demagnetizing field is applied, and the original magnetic flux cannot be produced. For this reason, in the permanent magnet motor, it is used in a range where the permanent magnet temperature does not exceed the demagnetizing temperature and a strong demagnetizing field is not applied to the permanent magnet. Considering that the permanent magnet temperature should not exceed the demagnetizing temperature, take measures such as strengthening the motor cooling system and dividing the permanent magnet to prevent the magnet from generating heat as much as possible. It was inevitable that the cost would be very high because of the necessity.

この発明の目的は、永久磁石が減磁するのを回避して高温動作が可能となる回転電機のロータを提供することである。   An object of the present invention is to provide a rotor of a rotating electrical machine that can operate at a high temperature while avoiding demagnetization of a permanent magnet.

上記目的を達成するため、この発明に係る回転電機のロータは、円盤状のロータコアと、前記ロータコアに、交互に極性を変え周方向に沿って配置した複数の永久磁石と、前記ロータコアに、前記各永久磁石の磁束と略平行に、且つ、相互に離間して位置するように形成した複数のスリットとを有する。   In order to achieve the above object, a rotor of a rotating electrical machine according to the present invention includes a disk-shaped rotor core, a plurality of permanent magnets that are alternately changed in polarity along the circumferential direction on the rotor core, and the rotor core, It has a plurality of slits formed so as to be positioned substantially parallel to the magnetic flux of each permanent magnet and separated from each other.

この発明に係る回転電機のロータにより、ｑ軸の磁気抵抗を大きくすることができるので、ｄ軸インダクタンスＬｄがｑ軸インダクタンスＬｑよりも大きくなる（Ｌｄ＞Ｌｑ）ことを実現する順凸極型のモータとなって、永久磁石が減磁するのを回避することができる。これにより、高温動作が可能となるので、冷却構造を簡素化することができ、コストを低減することができる。   Since the q-axis magnetic resistance can be increased by the rotor of the rotating electrical machine according to the present invention, a forward convex pole type that realizes that the d-axis inductance Ld is larger than the q-axis inductance Lq (Ld> Lq). It becomes a motor and it can avoid demagnetizing a permanent magnet. As a result, high-temperature operation is possible, so that the cooling structure can be simplified and the cost can be reduced.

以下、この発明を実施するための最良の形態について図面を参照して説明する。
図１は、この発明の一実施の形態に係る回転電機のロータの平面図である。図１に示すように、回転電機のロータ１０は、円盤状のロータコア１１と、ロータコア１１の回転軸となるシャフト１２を有する。ロータコア１１は、例えば、電磁鋼板を積層して形成されており、ロータコア１１の外周縁近傍には、複数の永久磁石Ｎ極１３と永久磁石Ｓ極１４が交互に極性を変え周方向に沿って配置されている。 The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a plan view of a rotor of a rotating electrical machine according to an embodiment of the present invention. As shown in FIG. 1, the rotor 10 of the rotating electrical machine includes a disk-shaped rotor core 11 and a shaft 12 that serves as a rotation axis of the rotor core 11. The rotor core 11 is formed, for example, by laminating electromagnetic steel plates, and in the vicinity of the outer peripheral edge of the rotor core 11, a plurality of permanent magnet N poles 13 and permanent magnet S poles 14 alternately change the polarity along the circumferential direction. Has been placed.

永久磁石Ｎ極１３と永久磁石Ｓ極１４のそれぞれの両端には、長軸方向を半径方向としてロータコア１１の外周縁側に長方形の第１スリット１５が開けられている。更に、永久磁石Ｎ極１３と永久磁石Ｓ極１４のそれぞれの外周側（ロータコア１１外周縁側）には、長軸方向をロータコア１１の半径方向とする幅が狭く細長い溝状の第２スリット１６が、各永久磁石１３，１４から離間して複数個開けられている。各第２スリット１６は、各永久磁石１３，１４の両第１スリット１５の間に、各永久磁石１３，１４の磁束と略平行になるように、それぞれの隣接間隔がほぼ等しく並ぶ放射状に配置されている。   At both ends of the permanent magnet N pole 13 and the permanent magnet S pole 14, rectangular first slits 15 are formed on the outer peripheral edge side of the rotor core 11 with the major axis direction as the radial direction. Furthermore, on each outer peripheral side (outer peripheral edge side of the rotor core 11) of the permanent magnet N pole 13 and the permanent magnet S pole 14, a narrow and narrow groove-like second slit 16 whose long axis direction is the radial direction of the rotor core 11 is formed. A plurality of permanent magnets 13 and 14 are opened apart from each other. The second slits 16 are radially arranged between the first slits 15 of the permanent magnets 13 and 14 so that their adjacent intervals are substantially equally arranged so as to be substantially parallel to the magnetic flux of the permanent magnets 13 and 14. Has been.

この第２スリット１６は幅が狭く、隣接する第２スリット１６同士はスリット幅よりも広いい間隔を有するため、各永久磁石１３，１４が作る磁束と同一方向のｄ軸の磁気抵抗は、第２スリット１６を設けていない場合に比べ大きな変化はない。即ち、ロータ１０のｄ軸方向のインダクタンスＬｄは殆ど変化しない。一方、ｄ軸と直交する方向のｑ軸の磁気抵抗は、複数の第２スリット１６がｑ軸磁束に対する磁気抵抗となるため、第２スリット１６を設けていない場合に比べ大きくなる。即ち、ロータ１０のｑ軸方向のインダクタンスＬｑは低下することになる。従って、ｄ軸インダクタンスＬｄをｑ軸インダクタンスＬｑより大きくする（Ｌｄ＞Ｌｑ）ことが可能となり、順凸極の特性を有するロータ１０とすることができる。   Since the second slit 16 is narrow and the adjacent second slits 16 are spaced apart from each other by a width larger than the slit width, the d-axis magnetoresistance in the same direction as the magnetic flux generated by the permanent magnets 13 and 14 is There is no significant change compared to the case where the two slits 16 are not provided. That is, the inductance Ld in the d-axis direction of the rotor 10 hardly changes. On the other hand, the q-axis magnetoresistance in the direction orthogonal to the d-axis is larger than that in the case where the second slits 16 are not provided because the plurality of second slits 16 serve as magnetoresistance to the q-axis magnetic flux. That is, the inductance Lq in the q-axis direction of the rotor 10 decreases. Therefore, the d-axis inductance Ld can be made larger than the q-axis inductance Lq (Ld> Lq), and the rotor 10 having the forward convex pole characteristic can be obtained.

このロータ１０（図１参照）において、第２スリット１６の数をｍ、第２スリット１６の半径方向長さをＭ、第２スリット１６の回転方向長さをＮ、ロータコア１１の積層厚さをＬ、電磁鋼板部の透磁率をμ０ とし、第２スリット１６を開けない場合のｄ軸方向の軸磁気抵抗をＲｍｄ、ｑ軸方向の磁気抵抗をＲｍｑ、第２スリット１６を開けた場合のｄ軸方向の磁気抵抗をＲｍｄ’、ｑ軸方向の磁気抵抗をＲｍｑ’とすれば、第２スリット１６を開けた場合を以下のように近似することができる。なお、第２スリット１６を開けない場合のｄ軸方向の軸磁気抵抗Ｒｍｄ、ｑ軸方向の磁気抵抗Ｒｍｑは、略エアギャップと永久磁石で決まる磁気抵抗と考えられる。 In this rotor 10 (see FIG. 1), the number of the second slits 16 is m, the length of the second slits 16 in the radial direction is M, the length of the second slits 16 in the rotational direction is N, and the lamination thickness of the rotor core 11 is set. L, the magnetic permeability of the magnetic steel sheet portion is μ 0 , the axial magnetic resistance in the d-axis direction when the second slit 16 cannot be opened is Rmd, the magnetic resistance in the q-axis direction is Rmq, and the second slit 16 is opened If the magnetic resistance in the d-axis direction is Rmd ′ and the magnetic resistance in the q-axis direction is Rmq ′, the case where the second slit 16 is opened can be approximated as follows. Note that the axial magnetic resistance Rmd in the d-axis direction and the magnetic resistance Rmq in the q-axis direction when the second slit 16 cannot be opened are considered to be magnetic resistances that are substantially determined by the air gap and the permanent magnet.

Ｒｍｄ’≒Ｒｍｄ…（１）
Ｒｍｑ’＝Ｒｍｑ＋ｍ×Ｎ／（μ０ ×Ｍ×Ｌ）…（２） Rmd′≈Rmd (1)
Rmq ′ = Rmq + m × N / (μ 0 × M × L) (2)

式（１）において、ロータコア１１を構成する電磁鋼板部とスリット部の磁気抵抗が並列配置となり、電磁鋼板部の透磁率μ０ はエアギャップ部の透磁率に比べ非常に大きいことから、結果として、ｄ軸方向の磁気抵抗Ｒｍｄとｑ軸方向の磁気抵抗Ｒｍｑが第２スリット１６の形成前後で変化することはないとした。上記式（１），（２）は、第２スリット１６の形成によって凸極比を変更することができることを意味する。 In the formula (1), the magnetic steel plate portion and the slit portion constituting the rotor core 11 are arranged in parallel, and the magnetic permeability μ 0 of the magnetic steel plate portion is very large compared to the magnetic permeability of the air gap portion. The magnetoresistance Rmd in the d-axis direction and the magnetoresistance Rmq in the q-axis direction do not change before and after the formation of the second slit 16. The above formulas (1) and (2) mean that the convex pole ratio can be changed by forming the second slit 16.

また、第２スリット１６の幅（短軸方向）Ｈと、第２スリット１６の数Ｎ、各永久磁石１３，１４の厚さＴ、及び各永久磁石１３，１４の面積に対する第２スリット１６の面積の比をｋとして、
２Ｔ＜Ｎ×Ｌ×ｋ
の関係を満足することにより、ｄ軸インダクタンスＬｄをｑ軸インダクタンスＬｑより大きくする（Ｌｄ＞Ｌｑ）ことができる。 In addition, the width (short axis direction) H of the second slit 16, the number N of the second slits 16, the thickness T of each permanent magnet 13, 14, and the area of each permanent magnet 13, 14, If the area ratio is k,
2T <N × L × k
By satisfying this relationship, the d-axis inductance Ld can be made larger than the q-axis inductance Lq (Ld> Lq).

図２は、この発明の他の実施の形態に係る回転電機のロータの平面図である。図２に示すように、回転電機のロータ２０は、第２スリット１６の内部に、磁性体２１を装着している。その他の構成及び作用は、ロータ１０と同様である。   FIG. 2 is a plan view of a rotor of a rotating electrical machine according to another embodiment of the present invention. As shown in FIG. 2, the rotor 20 of the rotating electrical machine has a magnetic body 21 mounted inside the second slit 16. Other configurations and operations are the same as those of the rotor 10.

磁性体２１は、例えば、複数枚の電磁鋼板２２により形成されている。複数枚の電磁鋼板２２は、板厚方向に密着させて積み重ねた積層状態にすると共に重ね合わせ面がロータコア１１の半径方向と一致するように、即ち、各永久磁石１３，１４の磁束を通し易い方向性を有するように磁束と略平行に、隙間なく挿入配置されている。これにより、ｄ軸の磁気抵抗は、第２スリット１６の有無に拘わらず略不変となる。   The magnetic body 21 is formed by, for example, a plurality of electromagnetic steel plates 22. The plurality of electromagnetic steel plates 22 are stacked in close contact with each other in the plate thickness direction, and the overlapping surface coincides with the radial direction of the rotor core 11, that is, the magnetic fluxes of the permanent magnets 13 and 14 can be easily passed. In order to have directionality, it is inserted and arranged substantially parallel to the magnetic flux without a gap. As a result, the d-axis magnetic resistance is substantially unchanged regardless of the presence or absence of the second slit 16.

一方、ｑ軸の磁気抵抗は、第２スリット１６の内部に挿入配置した磁性体２１がｑ軸方向に対し略直交しているため、第２スリット１６を形成しないロータに比べ大きくなる。   On the other hand, the magnetic resistance of the q axis is larger than that of the rotor that does not form the second slit 16 because the magnetic body 21 inserted and arranged inside the second slit 16 is substantially orthogonal to the q axis direction.

従って、ｄ軸の磁気抵抗を大きくすることなくｑ軸の磁気抵抗のみを大きくすることができるので、ロータ２０は、ロータ１０（図１参照）より、更に順凸極性を高めることができる。   Accordingly, since only the q-axis magnetic resistance can be increased without increasing the d-axis magnetic resistance, the rotor 20 can further increase the forward convex polarity as compared with the rotor 10 (see FIG. 1).

なお、回転電機が、永久磁石Ｎ極１３と永久磁石Ｓ極１４がロータコア１１内に埋め込んで配置した、ＩＰＭ（Ｉｎｔｅｒｉｏｒ Ｐｅｒｍａｎｅｎｔ Ｍａｇｎｅｔ）構造を有する場合、各永久磁石１３，１４のそれぞれの外周側（ロータ外周縁側）のみに第２スリット１６を入れると、ｑ軸磁束は各永久磁石１３，１４の外周側となるので、ｄ軸インダクタンスＬｄをｑ軸インダクタンスＬｑより大きくする（Ｌｄ＞Ｌｑ）ことが可能となり、順凸極の特性を有するロータ１０とすることができる。また、高回転に伴う各永久磁石１３，１４の左右両端コア部の応力集中を緩和することができる。   When the rotating electrical machine has an IPM (Interior Permanent Magnet) structure in which the permanent magnet N pole 13 and the permanent magnet S pole 14 are embedded in the rotor core 11, the outer peripheral side of each permanent magnet 13, 14 ( If the second slit 16 is inserted only in the outer peripheral edge of the rotor), the q-axis magnetic flux is on the outer peripheral side of the permanent magnets 13 and 14, so the d-axis inductance Ld can be made larger than the q-axis inductance Lq (Ld> Lq). Thus, the rotor 10 having the characteristics of forward convex poles can be obtained. Moreover, the stress concentration of the left and right end core portions of the permanent magnets 13 and 14 accompanying high rotation can be reduced.

このように、この発明によれば、永久磁石１３，１４の磁束と略平行になるように第２スリット１６を設けたので、ｑ軸の磁気抵抗を大きくすることができ、これによって、ｄ軸インダクタンスＬｄがｑ軸インダクタンスＬｑより大きく（Ｌｄ＞Ｌｑ）なり順凸極型のモータとなる。この順凸極構造により、永久磁石の減磁を回避することができるので、高温動作が可能となって冷却構造を簡素化することができ、コストを低減することができる。   As described above, according to the present invention, since the second slit 16 is provided so as to be substantially parallel to the magnetic flux of the permanent magnets 13 and 14, the q-axis magnetic resistance can be increased, and thereby the d-axis. The inductance Ld is larger than the q-axis inductance Lq (Ld> Lq), and a forward convex motor is obtained. With this forward convex pole structure, demagnetization of the permanent magnet can be avoided, so that a high temperature operation is possible, the cooling structure can be simplified, and the cost can be reduced.

なお、上記実施の形態において、第２スリット１６は、永久磁石Ｎ極１３と永久磁石Ｓ極１４のそれぞれの外周側（ロータ外周縁側）に形成しているが、これに限るものではなく、第２スリット１６を、永久磁石Ｎ極１３と永久磁石Ｓ極１４のそれぞれの内周側（シャフト１２側）に、或いは外周側（ロータ外周縁側）と内周側（シャフト１２側）の両方に、形成してもよい。   In the above embodiment, the second slit 16 is formed on the outer peripheral side (rotor outer peripheral side) of each of the permanent magnet N pole 13 and the permanent magnet S pole 14, but the present invention is not limited to this. 2 slits 16 on the inner peripheral side (shaft 12 side) of each of the permanent magnet N pole 13 and the permanent magnet S pole 14, or on both the outer peripheral side (rotor outer peripheral side) and the inner peripheral side (shaft 12 side), It may be formed.

この発明の一実施の形態に係る回転電機のロータの平面図である。It is a top view of the rotor of the rotary electric machine which concerns on one embodiment of this invention. この発明の他の実施の形態に係る回転電機のロータの平面図である。It is a top view of the rotor of the rotary electric machine which concerns on other embodiment of this invention.

符号の説明Explanation of symbols

１０，２０ ロータ
１１ ロータコア
１２ シャフト
１３ 永久磁石Ｎ極
１４ 永久磁石Ｓ極
１５ 第１スリット
１６ 第２スリット
２１ 磁性体
２２ 電磁鋼板 DESCRIPTION OF SYMBOLS 10,20 Rotor 11 Rotor core 12 Shaft 13 Permanent magnet N pole 14 Permanent magnet S pole 15 1st slit 16 2nd slit 21 Magnetic body 22 Electrical steel plate

Claims (5)

円盤状のロータコアと、
前記ロータコアに、交互に極性を変え周方向に沿って配置した複数の永久磁石と、
前記ロータコアに、前記各永久磁石の磁束と略平行に、且つ、相互に離間して位置するように形成した複数のスリットと
を有する回転電機のロータ。 A disk-shaped rotor core;
In the rotor core, a plurality of permanent magnets alternately changing the polarity and arranged along the circumferential direction, and
A rotor of a rotating electrical machine having a plurality of slits formed in the rotor core so as to be positioned substantially parallel to the magnetic flux of each permanent magnet and spaced apart from each other. 前記各永久磁石が前記ロータコアに埋め込まれたＩＰＭ（Ｉｎｔｅｒｉｏｒ Ｐｅｒｍａｎｅｎｔ Ｍａｇｎｅｔ）構造を有し、前記複数のスリットを、前記各永久磁石の外周側のみに設けた請求項１に記載の回転電機のロータ。   2. The rotor of a rotating electrical machine according to claim 1, wherein each permanent magnet has an IPM (Interior Permanent Magnet) structure embedded in the rotor core, and the plurality of slits are provided only on an outer peripheral side of each permanent magnet. 前記スリットの内部に、前記各永久磁石の磁束を通し易い方向性を有して配置された磁性体を有する請求項１または２に記載の回転電機のロータ。   The rotor for a rotating electrical machine according to claim 1 or 2, further comprising a magnetic body arranged in the slit so as to easily pass the magnetic flux of each permanent magnet. 前記磁性体は、重ね合わせ面が前記ロータコアの半径方向と一致するように積層した複数の電磁鋼板である請求項３に記載の回転電機のロータ。   4. The rotor of a rotating electrical machine according to claim 3, wherein the magnetic body is a plurality of electromagnetic steel plates laminated so that an overlapping surface coincides with a radial direction of the rotor core. 前記スリットの幅をＨ、前記スリットの数をＮ、前記各永久磁石の厚さをＴ、及び前記各永久磁石の面積に対する前記スリットの面積比をｋとするとき、２Ｔ＜Ｎ×Ｌ×ｋの関係を有する請求項1から４のいずれかに記載の回転電機のロータ。   When the width of the slit is H, the number of the slits is N, the thickness of each permanent magnet is T, and the area ratio of the slit to the area of each permanent magnet is k, 2T <N × L × k The rotor for a rotating electrical machine according to any one of claims 1 to 4, wherein the rotor has the following relationship.
JP2004263955A 2004-09-10 2004-09-10 Rotor of rotary electric machine Pending JP2006081338A (en)

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EP1995849A2 (en) 2007-05-22 2008-11-26 Nissan Motor Co., Ltd. Motor
US7795772B2 (en) 2007-05-22 2010-09-14 Nissan Motor Co., Ltd. Motor
DE102009049600A1 (en) * 2009-10-16 2011-04-21 Minebea Co., Ltd. Electrical machine i.e. external rotor-electric motor, has opening formed between pole shoes that lie in interval, where interval is calculated from diameter of stator, multiple of number of rotor and stator poles and correction factor
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