JP2004254446A - Magnetizer of permanent magnet rotor - Google Patents

Magnetizer of permanent magnet rotor Download PDF

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Publication number
JP2004254446A
JP2004254446A JP2003043095A JP2003043095A JP2004254446A JP 2004254446 A JP2004254446 A JP 2004254446A JP 2003043095 A JP2003043095 A JP 2003043095A JP 2003043095 A JP2003043095 A JP 2003043095A JP 2004254446 A JP2004254446 A JP 2004254446A
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JP
Japan
Prior art keywords
rotor
permanent magnet
eccentric
magnet
magnetized
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
JP2003043095A
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Japanese (ja)
Inventor
Tetsuya Yoshida
哲也 吉田
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.)
Yaskawa Electric Corp
Original Assignee
Yaskawa Electric Corp
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 Yaskawa Electric Corp filed Critical Yaskawa Electric Corp
Priority to JP2003043095A priority Critical patent/JP2004254446A/en
Publication of JP2004254446A publication Critical patent/JP2004254446A/en
Pending legal-status Critical Current

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  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetizer for a permanent magnet rotor in which even a permanent magnet rotor having eccentric magnets can be magnetized well. <P>SOLUTION: The magnetizer 4 for a permanent magnet rotor 1 comprises a hollow magnetizing yoke 5 having slots 8 and teeth 6 on the inner circumference, and a coil 7 wound around the teeth 6 wherein eccentric magnets 2 are arranged on the outer circumference of a rotor 1. Each of the teeth 6 provided in the magnetizing yoke 5 has a forward end shapes combining a circular arc 6a eccentric along the outer circumference of the eccentric magnet 2 of the rotor 1, and a circular arc 6b centering about the center of the rotor 1. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、永久磁石形電動機の回転子を着磁する着磁装置に関し、特に回転子外周に偏心マグネットを配置した永久磁石形回転子を着磁する着磁装置に関するものである。
【0002】
【従来の技術】
通常、永久磁石形電動機の試作を行う場合は、既着磁マグネットを使用して回転子を製作する。そして、特性評価後に量産に移行するが、量産時には、作業性、ハンドリングし易さ等の面から、未着磁マグネットを使用してまず回転子を製作し、その後に、着磁装置にて着磁を行うようにしている。
従来、回転子の表面に永久磁石を配置した永久磁石形電動機の回転子を着磁する場合、特許文献1に示すように、着磁ヨークに設けられたティース部の先端を回転子の中心と同心の円弧状に形成して、永久磁石に着磁を施していた。
【0003】
【特許文献1】
特開平11−308825号公報(図3)
【0004】
【発明が解決しようとする課題】
しかしながら、このような従来技術においては、永久磁石が、外周面の円弧が、回転子の中心と同心の場合は、永久磁石の外周面と着磁ヨークのティース部の先端とのギャップが均等で問題はなかったが、永久磁石の外周面の円弧が、回転子の中心に対して偏心している所謂偏心マグネットの場合は、永久磁石の外周面と着磁ヨークのティース部の先端とのギャップが不均一となり、良好な着磁ができないという問題があった。
すなわち、偏心マグネットの偏心部頂点付近では磁気ギャップが小さく、着磁装置が発生する磁束の方向もマグネットの磁化方向とほぼ平行になる為、完全に着磁される。しかし、マグネット端部に近づくにつれて、磁気ギャップも大きくなり、着磁装置が発生する磁束もマグネットの磁化方向とずれてくる為、着磁に必要な有効磁束が得られず、完全に着磁されない部分が生じる。不完全着磁部が生じることで、回転子が発生する磁束分布が理想状態の正弦波からずれた歪んだ波形となる為、コギングトルク、誘起電圧の高調波成分ともに増大し、電動機の発生するトルク脈動が大きくなるという問題である。
本発明は、このような問題を解決するためになされたもので、偏心マグネットを有する永久磁石形回転子においても良好に着磁することができる永久磁石形回転子の着磁装置を提供することを目的とするものである。
【0005】
【課題を解決するための手段】
上記問題を解決するため、本発明は、内周にスロット部及びティース部を有する中空の着磁ヨークと、前記ティース部に巻装したコイルで構成し、回転子の外周部に偏心マグネットを配置した永久磁石形回転子を着磁する着磁装置において、
前記着磁ヨークに設けたティース部の先端形状を、前記回転子の偏心マグネット外周に沿って偏心させた円弧と、回転子中心を中心点とする円弧を組み合わせた形状としたものである。
【0006】
【発明の実施の形態】
以下、本発明の実施例を図1に基づいて説明する。
図1は本発明の実施例における着磁装置の要部を示す部分正断面図である。
図1において、1は外周面に偏心マグネット2を等間隔に配置した永久磁石形回転子、3は前記偏心マグネット2の外周面に被せた保護シート、4は着磁装置、5は積層電磁鋼鈑からなる着磁ヨーク、6は着磁ヨークに設けたティース部で、先端の形状を、前記回転子1の偏心マグネット2外周に沿って偏心させた円弧6aと回転子1の中心を中心点とする円弧6bを組み合わせた形状としている。7は前記ティース部6に巻装したコイル、8はスロット部である。
このような構成において、着磁装置4のティース部6の先端は、全範囲において偏心マグネット2の外周面と均一で、かつ小さなギャップを介して対向することになり、着磁に必要な磁束量を確保することができる。これにより、偏心マグネット2全体が完全に着磁できるようになるため、回転子1が発生する磁束分布も正弦波に近づき、コギングトルク、誘起電圧の高調波成分ともに既着磁マグネットで構成していた回転子と同等の特性を得ることができる。
【0007】
【発明の効果】
以上述べたように、本発明によれば、偏心マグネット全体を良好に着磁することができ、回転子が発生する磁束分布も正弦波に近づき、コギングトルク、誘起電圧の高調波成分ともに既着磁マグネットで構成していた回転子と同等の特性を得ることができるという効果がある。
【図面の簡単な説明】
【図1】本発明の実施例における着磁装置の要部を示す部分正断面図である。
【符号の説明】
1 永久磁石形回転子
2 偏心マグネット
3 保護シート
4 着磁装置
5 着磁ヨーク
6 ティース部
6a マグネット外周に沿った円弧部
6b 回転子中心を中心点とする円弧部
7 コイル
8 スロット部
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a magnetizing device for magnetizing a rotor of a permanent magnet type electric motor, and more particularly to a magnetizing device for magnetizing a permanent magnet type rotor having an eccentric magnet arranged on the outer periphery of the rotor.
[0002]
[Prior art]
Normally, when a prototype of a permanent magnet type electric motor is manufactured, a rotor is manufactured by using a magnetized magnet. After the characteristic evaluation, mass production is started.In mass production, first, a rotor is manufactured using a non-magnetized magnet, and then the magnetized device is used for magnetism in terms of workability and ease of handling. I try to do magnetism.
Conventionally, when magnetizing a rotor of a permanent magnet type motor in which a permanent magnet is arranged on the surface of the rotor, as shown in Patent Document 1, the tip of a tooth portion provided on a magnetized yoke is positioned at the center of the rotor. It was formed in a concentric arc shape and magnetized the permanent magnet.
[0003]
[Patent Document 1]
JP-A-11-308825 (FIG. 3)
[0004]
[Problems to be solved by the invention]
However, in such a conventional technique, when the arc of the outer peripheral surface of the permanent magnet is concentric with the center of the rotor, the gap between the outer peripheral surface of the permanent magnet and the tip of the teeth of the magnetized yoke is uniform. Although there was no problem, in the case of a so-called eccentric magnet in which the circular arc of the outer peripheral surface of the permanent magnet is eccentric with respect to the center of the rotor, the gap between the outer peripheral surface of the permanent magnet and the tip of the teeth portion of the magnetized yoke was reduced. There has been a problem that the magnetization becomes non-uniform and good magnetization cannot be achieved.
That is, the magnetic gap is small near the top of the eccentric portion of the eccentric magnet, and the direction of the magnetic flux generated by the magnetizing device is almost parallel to the magnetization direction of the magnet, so that the magnet is completely magnetized. However, as the distance from the magnet end increases, the magnetic gap increases, and the magnetic flux generated by the magnetizing device also deviates from the magnetizing direction of the magnet, so that the effective magnetic flux required for magnetizing cannot be obtained, and the magnet is not completely magnetized. Part occurs. Since the incompletely magnetized portion causes the magnetic flux distribution generated by the rotor to have a distorted waveform deviated from the ideal sine wave, both the cogging torque and the harmonic components of the induced voltage increase, and the motor is generated. The problem is that torque pulsation increases.
The present invention has been made to solve such a problem, and it is an object of the present invention to provide a permanent magnet type rotor magnetizing device which can satisfactorily magnetize even a permanent magnet type rotor having an eccentric magnet. The purpose is.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the present invention comprises a hollow magnetized yoke having a slot portion and a tooth portion on the inner circumference, and a coil wound around the tooth portion, and an eccentric magnet is arranged on the outer circumference of the rotor. In the magnetizing device for magnetizing the magnetized permanent magnet rotor,
The teeth provided on the magnetized yoke may have a tip formed by combining an arc decentered along the outer circumference of the eccentric magnet of the rotor and an arc centered on the center of the rotor.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIG.
FIG. 1 is a partial front sectional view showing a main part of a magnetizing device according to an embodiment of the present invention.
In FIG. 1, reference numeral 1 denotes a permanent magnet rotor having eccentric magnets 2 arranged at equal intervals on the outer peripheral surface, 3 denotes a protective sheet covering the outer peripheral surface of the eccentric magnet 2, 4 denotes a magnetizing device, and 5 denotes laminated electromagnetic steel. A magnetized yoke 6 made of a sheet is a tooth portion provided on the magnetized yoke. The arc 6a whose tip is eccentric along the outer periphery of the eccentric magnet 2 of the rotor 1 and the center of the rotor 1 as a center point. And a combination of arcs 6b. Reference numeral 7 denotes a coil wound around the teeth portion 6, and reference numeral 8 denotes a slot portion.
In such a configuration, the tip of the teeth portion 6 of the magnetizing device 4 is uniformly opposed to the outer peripheral surface of the eccentric magnet 2 via a small gap in the entire range, and the amount of magnetic flux required for magnetizing Can be secured. As a result, the entire eccentric magnet 2 can be completely magnetized, so that the magnetic flux distribution generated by the rotor 1 approaches a sine wave, and both the cogging torque and the harmonic components of the induced voltage are constituted by magnetized magnets. The same characteristics as the rotator can be obtained.
[0007]
【The invention's effect】
As described above, according to the present invention, the entire eccentric magnet can be magnetized satisfactorily, the magnetic flux distribution generated by the rotor approaches a sine wave, and both the cogging torque and the harmonic components of the induced voltage are already attached. There is an effect that it is possible to obtain characteristics equivalent to those of a rotor constituted by a magnetic magnet.
[Brief description of the drawings]
FIG. 1 is a partial front sectional view showing a main part of a magnetizing device according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Permanent magnet rotor 2 Eccentric magnet 3 Protective sheet 4 Magnetization device 5 Magnetization yoke 6 Teeth part 6a Arc part 6b along magnet circumference Arc part 7 centered on rotor center 7 Coil 8 Slot part

Claims (1)

内周にスロット部及びティース部を有する中空の着磁ヨークと、前記ティース部に巻装したコイルで構成し、回転子の外周部に偏心マグネットを配置した永久磁石形回転子を着磁する着磁装置において、
前記着磁ヨークに設けたティース部の先端形状を、前記回転子の偏心マグネット外周に沿って偏心させた円弧と、回転子中心を中心点とする円弧を組み合わせた形状としたことを特徴とする永久磁石形回転子の着磁装置。
A magnetized yoke having a hollow magnetized yoke having a slot portion and a tooth portion on an inner periphery thereof and a coil wound around the tooth portion, and magnetizing a permanent magnet type rotor having an eccentric magnet arranged on an outer peripheral portion of the rotor. In a magnetic device,
The tip of the teeth provided on the magnetized yoke has a shape obtained by combining an arc decentered along the outer circumference of the eccentric magnet of the rotor and an arc centered on the rotor center. Permanent magnet type rotor magnetizing device.
JP2003043095A 2003-02-20 2003-02-20 Magnetizer of permanent magnet rotor Pending JP2004254446A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003043095A JP2004254446A (en) 2003-02-20 2003-02-20 Magnetizer of permanent magnet rotor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003043095A JP2004254446A (en) 2003-02-20 2003-02-20 Magnetizer of permanent magnet rotor

Publications (1)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090251023A1 (en) * 2008-04-04 2009-10-08 Mitsubishi Electric Corporation Permanent magnet rotating electric machine and electric power steering device using the same
JP2010233325A (en) * 2009-03-26 2010-10-14 Toyota Motor Corp Brushless motor
CN113839490A (en) * 2020-06-24 2021-12-24 莱克电气股份有限公司 Rotor, efficient low-noise motor and application thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090251023A1 (en) * 2008-04-04 2009-10-08 Mitsubishi Electric Corporation Permanent magnet rotating electric machine and electric power steering device using the same
US8598762B2 (en) * 2008-04-04 2013-12-03 Mitsubishi Electric Corporation Permanent magnet rotating electric machine and electric power steering device using the same
JP2010233325A (en) * 2009-03-26 2010-10-14 Toyota Motor Corp Brushless motor
CN113839490A (en) * 2020-06-24 2021-12-24 莱克电气股份有限公司 Rotor, efficient low-noise motor and application thereof

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