JP2002343541A - Induction heating device - Google Patents
Induction heating deviceInfo
- Publication number
- JP2002343541A JP2002343541A JP2002059585A JP2002059585A JP2002343541A JP 2002343541 A JP2002343541 A JP 2002343541A JP 2002059585 A JP2002059585 A JP 2002059585A JP 2002059585 A JP2002059585 A JP 2002059585A JP 2002343541 A JP2002343541 A JP 2002343541A
- Authority
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- Japan
- Prior art keywords
- magnetic field
- generating means
- field generating
- heated
- magnetic
- 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.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、誘導加熱装置およ
び定着装置に関するものである。The present invention relates to an induction heating device and a fixing device.
【０００２】[0002]
【従来の技術】交流電流により交流磁界を発生させて行
なう誘導加熱の手法を用いた応用例として、特開平７
−２９５４１４ に記載された定着装置がある。この定
着装置では加熱ローラの外周面にコイルを配置してい
る。この場合、コイルによる交流磁界は加熱ローラ外周
面だけに作用するのではなく、ローラと対向する方向に
も磁場を発生させるため、これが定着器外に漏れたり、
その他の金属部材を加熱してしまうといった障害にな
る。また、磁束が集中しないため、効率も低下してい
た。2. Description of the Related Art As an application example using an induction heating method performed by generating an AC magnetic field by an AC current, Japanese Patent Application Laid-Open No.
There is a fixing device described in US Pat. In this fixing device, a coil is arranged on the outer peripheral surface of the heating roller. In this case, the AC magnetic field generated by the coil not only acts on the outer peripheral surface of the heating roller but also generates a magnetic field in a direction facing the roller.
An obstacle such as heating of other metal members occurs. In addition, since the magnetic flux is not concentrated, the efficiency has been reduced.
【０００３】上記の問題を解決するため、特開平１０−
３６０３０１のように、コイルから発生する磁場を遮断
するための磁性体と加熱ローラの間にコイルを挟むよう
に配置した例がある。この場合、定着器外への磁束の漏
れが低減でき、その他の金属部材の加熱を抑えることが
可能である。In order to solve the above problem, Japanese Patent Application Laid-Open No.
As in the case of 360301, there is an example in which a coil is disposed between a magnetic body for interrupting a magnetic field generated from the coil and a heating roller. In this case, the leakage of the magnetic flux to the outside of the fixing device can be reduced, and the heating of other metal members can be suppressed.
【０００４】また磁石を用いた誘導加熱装置として、特
開昭５９−１８９７０または特開平５−１２１１５７の
ように、複数の永久磁石あるいは多極着磁した永久磁石
からなる回転磁石ロールを所定の周速度で回転させて、
磁石が形成するＮ、Ｓ交番磁界を被加熱体に作用させる
ものがある。これに類似する例として特開平５−８２２
４８があるが、これは常時一方向に発生する磁束を被加
熱体に作用させるものであり、磁石が形成するＮ、Ｓ交
番磁界とは異なり、連続放射磁界を利用するため、同じ
エネルギーの磁石を使用した場合には、加熱の効果はル
ート２倍となり、被加熱体との接近距離が大きくでき
る。さらに類似する例としては、特開２００１−２９６
７６５がある。これはハロゲンヒータで加熱する定着ロ
ーラに対し、連続給紙する場合の補助的な熱源として、
磁石が形成するＮ、Ｓ交番磁界を被加熱体に作用させる
ものである。As an induction heating device using a magnet, a rotating magnet roll composed of a plurality of permanent magnets or a multi-pole magnetized permanent magnet as described in JP-A-59-18970 or JP-A-5-121157 has a predetermined circumference. Rotate at speed,
There is a type in which an N, S alternating magnetic field formed by a magnet acts on an object to be heated. An example similar to this is disclosed in Japanese Patent Laid-Open No. 5-822.
There are 48, but this always applies a magnetic flux generated in one direction to the object to be heated. Unlike the N and S alternating magnetic fields formed by the magnets, the magnets of the same energy When the is used, the heating effect is double the route, and the approach distance to the object to be heated can be increased. A further similar example is disclosed in JP-A-2001-296.
765. This is an auxiliary heat source for continuous feeding to the fixing roller heated by the halogen heater.
The N, S alternating magnetic field formed by the magnet acts on the object to be heated.
【０００５】また特開平１０−１５３９２２のように、
定着ローラ内部にコイルを設け、そのコイル内部に挿入
した永久磁石と、磁性材料で形成されコイル両端に配置
された側磁路部材により、定着ローラを含む閉磁路を形
成させ、コイルに断続的に直流電流を流して磁界に変化
を与えて誘導加熱する例がある。As disclosed in Japanese Patent Application Laid-Open No. 10-153922,
A coil is provided inside the fixing roller, and a permanent magnet inserted into the coil and side magnetic path members formed of a magnetic material and disposed at both ends of the coil form a closed magnetic path including the fixing roller, and the coil is intermittently formed. There is an example in which a direct current is applied to change a magnetic field to perform induction heating.
【０００６】[0006]
【本発明が解決しようとする課題】しかしながら特開平
１０−３６０３０１においては、磁場を遮断する磁性体
として、フェライト、鉄、珪素鋼板、パーマロイ等、い
わゆる軟磁性材料を使用しており、磁場を遮断する効果
はあるが、加熱ローラに十分な磁束を作用させ得るもの
ではない。また磁性体自体もコイルの交流磁界により加
熱されてしまい、加熱ローラの加熱効率を劇的に改善す
ることは困難である。However, in Japanese Patent Application Laid-Open No. 10-360301, a so-called soft magnetic material such as ferrite, iron, silicon steel plate, permalloy, or the like is used as a magnetic material for interrupting a magnetic field. However, it does not allow sufficient magnetic flux to act on the heating roller. Further, the magnetic material itself is also heated by the AC magnetic field of the coil, and it is difficult to dramatically improve the heating efficiency of the heating roller.
【０００７】特開昭５９−１８９７０、特開平５−８２
２４８および特開平５−１２１１５７においては、複数
の永久磁石により回転磁石ローラを多極化する必要があ
り、製作が困難である。また十分な周速度で回転しない
と、誘導加熱の効果が十分に得られない。同様に、特開
２００１−２９６７６５においても、十分な周速度で回
転しないと、誘導加熱の効果が十分に得られない。JP-A-59-18970, JP-A-5-82
In H.248 and JP-A-5-121157, it is necessary to make the rotating magnet roller multipole by a plurality of permanent magnets, and it is difficult to manufacture. If the rotation is not performed at a sufficient peripheral speed, the effect of induction heating cannot be sufficiently obtained. Similarly, in Japanese Patent Application Laid-Open No. 2001-296765, the effect of induction heating cannot be sufficiently obtained unless the rotation is performed at a sufficient peripheral speed.
【０００８】特開平１０−１５３９２２においては、閉
磁路の一部として永久磁石を使用するため、永久磁石そ
のものが誘導加熱され、熱減磁あるいは熱破損する問題
がある。また、コイルがローラ内部に設けされているた
め、コイルそのものが加熱され、コイル抵抗が増加し効
率が低下する。In Japanese Patent Application Laid-Open No. 10-153922, since a permanent magnet is used as a part of a closed magnetic circuit, there is a problem that the permanent magnet itself is induction-heated and thermally demagnetized or damaged. Further, since the coil is provided inside the roller, the coil itself is heated, the coil resistance increases, and the efficiency decreases.
【０００９】本発明は上記課題を解決するものであり、
被加熱体に容易かつ効果的に磁束を作用させて、加熱効
率を向上させた誘導加熱装置および本誘導加熱装置によ
り構成された定着装置を提供する。The present invention has been made to solve the above problems, and
Provided are an induction heating device in which a magnetic flux is easily and effectively applied to an object to be heated to improve heating efficiency, and a fixing device including the induction heating device.
【００１０】[0010]
【課題を解決するための手段】本発明に係わる誘導加熱
装置は、導電性の被加熱体と交流磁場発生手段から構成
される誘導加熱装置において、直流磁場発生手段を設
け、前記直流磁場発生手段が発生する磁場を前記交流磁
場発生手段により変化させて前記被加熱体を加熱するこ
とを特徴とする。An induction heating apparatus according to the present invention is an induction heating apparatus comprising a conductive object to be heated and an AC magnetic field generating means, wherein the DC magnetic field generating means is provided. The object is heated by changing the magnetic field generated by the AC magnetic field generating means.
【００１１】また前記直流磁場発生手段により発生して
いる直流磁場が０．００１T以上である領域内に、前記
交流磁場発生手段を配置することを特徴とする。Further, the AC magnetic field generating means is arranged in a region where the DC magnetic field generated by the DC magnetic field generating means is 0.001 T or more.
【００１２】また前記直流磁場発生手段を永久磁石と
し、前記永久磁石が部分的に異なる大きさの残留磁束密
度を有する、又は部分的に異なる厚みを有することを特
徴とする。Further, the DC magnetic field generating means is a permanent magnet, and the permanent magnet has a partially different residual magnetic flux density or a partially different thickness.
【００１３】さらに導電性の被加熱体からなる定着ロー
ラと前記被加熱体に対して交流磁界を与えて誘導加熱す
る交流磁場発生手段を備えた定着装置が、本発明の誘導
加熱装置によって構成されていることを特徴とする。Further, a fixing device including a fixing roller made of a conductive object to be heated and an AC magnetic field generating means for applying an AC magnetic field to the object to be heated by induction is constituted by the induction heating device of the present invention. It is characterized by having.
【００１４】また前記定着装置において、直流磁場発生
手段が前記定着ローラの両端部に配置され、前記直流磁
場発生手段が前記定着ローラの回転とは無関係に自由に
回転可能であり、さらには前記直流磁場発生手段とする
永久磁石が、前記定着ローラの回転軸に対してラジアル
方向に着磁されていることを特徴とする。In the fixing device, DC magnetic field generating means is disposed at both ends of the fixing roller, and the DC magnetic field generating means is freely rotatable independently of the rotation of the fixing roller. A permanent magnet as a magnetic field generating means is magnetized in a radial direction with respect to a rotation axis of the fixing roller.
【００１５】[0015]
【発明の実施の形態】以下、本発明の実施形態について
図面を基に説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１６】図１は、本発明の誘導加熱装置の本実施形
態１を示す図である。交流磁場発生手段２としてコイル
を使用し、被加熱体を覆うように一定のギャップを保持
して配置する。さらに直流磁場発生手段３を、交流磁場
発生手段２の外側を覆うように一定のギャップを保持し
て配置する。ここで直流磁場発生手段３には永久磁石を
使用し、鉄やパーマロイなどの軟磁性材料に対して極め
て導電率の低い特性を持つもの、例えばサマリウム・コ
バルト系ボンド永久磁石を使用する。その結果、永久磁
石表面に発生する渦電流を劇的に小さくでき、磁石の熱
減磁を防ぐことができる。FIG. 1 is a view showing Embodiment 1 of an induction heating apparatus according to the present invention. A coil is used as the AC magnetic field generating means 2 and is arranged so as to cover the object to be heated while maintaining a constant gap. Further, the DC magnetic field generating means 3 is arranged with a constant gap so as to cover the outside of the AC magnetic field generating means 2. Here, a permanent magnet is used for the DC magnetic field generating means 3, and a permanent magnet having an extremely low conductivity with respect to a soft magnetic material such as iron or permalloy, for example, a samarium-cobalt bond permanent magnet is used. As a result, the eddy current generated on the surface of the permanent magnet can be dramatically reduced, and thermal demagnetization of the magnet can be prevented.
【００１７】本実施形態１について磁界解析手法を用い
て、その加熱特性を確認した。ここで被加熱体１には磁
性ステンレス材料の磁気特性を与え、その厚みを０．０
８ｍｍとした。また被加熱体１と交流磁場発生手段２の
ギャップを約３ｍｍ、交流磁場発生手段２と直流磁場発
生手段３とのギャップを約１ｍｍとした。また交流磁場
発生手段２に流す電流は５０A、周波数は３０ｋHzであ
り、これを基準値とした。なお、本解析で用いた直流磁
場発生手段３の磁気特性と電気特性の基準値は、それぞ
れ残留磁束密度０．８Ｔ、導電率２．３×１０3 Ｓ／ｍ
であり、磁化条件の基準は完全着磁とした。The heating characteristics of the first embodiment were confirmed using a magnetic field analysis technique. Here, the magnetic properties of the magnetic stainless steel material are given to the object to be heated 1 and the thickness thereof is set to 0.0
8 mm. The gap between the object to be heated 1 and the AC magnetic field generating means 2 was about 3 mm, and the gap between the AC magnetic field generating means 2 and the DC magnetic field generating means 3 was about 1 mm. The current passed through the AC magnetic field generating means 2 was 50 A and the frequency was 30 kHz, which was used as a reference value. The reference values of the magnetic properties and the electrical properties of the DC magnetic field generating means 3 used in this analysis are a residual magnetic flux density of 0.8 T and a conductivity of 2.3 × 10 3 S / m, respectively.
And the standard of magnetization conditions was perfect magnetization.
【００１８】図２は、本実施形態１における直流磁場発
生手段３の磁化方向を、図１の交流磁場発生手段２の端
部側から見た概観図である。このように、直流磁場発生
手段３の磁化方向は、全ての領域において一様に被加熱
体１に対し直交する方向に設定されている。FIG. 2 is a schematic view showing the magnetization direction of the DC magnetic field generating means 3 in the first embodiment viewed from the end of the AC magnetic field generating means 2 in FIG. As described above, the magnetization direction of the DC magnetic field generation means 3 is set uniformly in the direction orthogonal to the object 1 in all regions.
【００１９】加熱特性の評価基準としては、被加熱体１
表面のジュール損失量（W／m3）を用いる。図３はジュ
ール損失量の各評価部位を示す図であり、被加熱体１と
交流磁場発生手段２のみを表わした上視図である。ジュ
ール損失量の評価部位は、交流磁場発生手段２の長手方
向に沿った被加熱体表面(Ａ１−Ａ２)、交流磁場発生手
段２の長手方向中間部の被加熱体表面中央部（Ｂ１−Ｂ
２）、交流磁場発生手段２端部の被加熱体表面端部近傍
（Ｃ１−Ｃ２）の３箇所である。The evaluation criteria for the heating characteristics are as follows.
The surface joule loss (W / m 3 ) is used. FIG. 3 is a diagram showing each evaluation site of the Joule loss amount, and is a top view showing only the object 1 to be heated and the AC magnetic field generating means 2. The part to be evaluated for the Joule loss amount is the surface of the object to be heated (A1-A2) along the longitudinal direction of the AC magnetic field generating means 2, and the central part of the surface of the object to be heated (B1-B) at the middle part in the longitudinal direction of the AC magnetic field generating means 2.
2), three places near the end of the surface of the object to be heated at the end of the AC magnetic field generating means 2 (C1-C2).
【００２０】図４は交流磁場発生手段２の長手方向に沿
った被加熱体表面のジュール損失量分布、図５は被加熱
体表面中央部のジュール損失量分布、図６は被加熱体表
面端部近傍のジュール損失量分布である。なお本発明の
誘導加熱装置と比較する従来例（ａ）として、定着装置
で使用されている磁場遮断手段を適用した場合の各評価
部位のジュール損失量分布をあわせて示す。FIG. 4 shows the Joule loss distribution on the surface of the object to be heated along the longitudinal direction of the AC magnetic field generating means 2, FIG. 5 shows the distribution of Joule loss at the center of the surface of the object to be heated, and FIG. 12 is a Joule loss distribution near a part. As a conventional example (a) to be compared with the induction heating device of the present invention, the Joule loss distribution at each evaluation site when the magnetic field blocking means used in the fixing device is applied is also shown.
【００２１】本実施形態１での各評価部位のジュール損
失量（ｂ）は、従来例（ａ）の約１０倍、すなわち被加
熱体１を加熱できる熱量が約１０倍に増加する。The Joule loss (b) at each evaluation site in the first embodiment is about 10 times that of the conventional example (a), that is, the amount of heat that can heat the object 1 is increased about 10 times.
【００２２】これは以下のように説明できる。This can be explained as follows.
【００２３】被加熱体１には、直流磁場発生手段３が形
成している磁場によりある一定の磁束が流れている。そ
の磁束量は、被加熱体１が磁気飽和しない程度としてい
るため、被加熱体１の磁気特性は透磁率が高い状態にあ
る。このような状態において、交流磁場発生手段２によ
る交流磁場を作用させると、小さな交流磁場の変化で
も、被加熱体１に流れる磁束に大きな変化が生じるた
め、被加熱体１に効率よく渦電流が発生し、ジュール損
失量が大幅に増加する。A certain magnetic flux flows through the object 1 due to the magnetic field formed by the DC magnetic field generating means 3. Since the amount of magnetic flux is such that the object to be heated 1 is not magnetically saturated, the magnetic characteristics of the object to be heated 1 are in a state of high magnetic permeability. In such a state, when an AC magnetic field is applied by the AC magnetic field generating means 2, even a small change in the AC magnetic field causes a large change in the magnetic flux flowing through the object 1 to be heated. Occurs and the amount of Joule loss increases significantly.
【００２４】すなわち、直流磁場発生手段３が形成して
いる空間磁場が、被加熱体１に対し、被加熱体１を磁気
飽和させない程度に作用していれば、交流磁場発生手段
２により効率よく加熱体１に渦電流を発生させることが
できるので、例えば図７、図８又は図９に示すように、
直流磁場発生手段３の磁化方向を設定する場合でも、効
果的に被加熱体１に渦電流を発生させ、ジュール損失量
を増加させることができる。That is, if the spatial magnetic field formed by the DC magnetic field generating means 3 acts on the object 1 to such an extent that the object 1 is not magnetically saturated, the AC magnetic field generating means 2 can efficiently perform the operation. Since an eddy current can be generated in the heating element 1, for example, as shown in FIG. 7, FIG. 8 or FIG.
Even when the magnetization direction of the DC magnetic field generating means 3 is set, an eddy current can be effectively generated in the object 1 to be heated, and the Joule loss can be increased.
【００２５】以上のことから、被加熱体の熱容量が一定
である条件において、加熱量を大幅に増加させることが
できるため、被加熱体の表面温度を急速に上昇させるこ
とができる。As described above, the amount of heating can be greatly increased under the condition that the heat capacity of the object to be heated is constant, so that the surface temperature of the object to be heated can be rapidly increased.
【００２６】図１０は、本発明の誘導加熱装置の本実施
形態２の概観図である。FIG. 10 is a schematic view of an induction heating apparatus according to a second embodiment of the present invention.
【００２７】本実施形態２では、直流磁場発生手段３
を、交流磁場発生手段２と被加熱体１の間の空間領域内
において、被加熱体１の近傍に配置しているこのように
配置することにより、直流磁場発生手段３が、交流磁場
発生手段２の交流磁場を遮ることなく、かつ直流磁場発
生手段３が形成する磁場をより十分に被加熱体１に作用
させることができる。直流磁場発生手段３の磁化方向
は、直流磁場発生手段３からの磁束が交流磁場発生手段
２を横切るような方向とすることが望ましいが、図１０
に示すような互いに対向する方向に限らず、同一方向に
磁化しても良い。また被加熱体１に対して平行な磁化方
向でなく、被加熱体１に対して直交する方向、または被
加熱体１に対して斜めの方向であっても良い。In the second embodiment, the DC magnetic field generating means 3
Is arranged in the space region between the AC magnetic field generating means 2 and the heated object 1 in the vicinity of the heated object 1 so that the DC magnetic field generating means 3 Thus, the magnetic field formed by the DC magnetic field generating means 3 can be more sufficiently applied to the object 1 without interrupting the AC magnetic field 2. It is desirable that the direction of magnetization of the DC magnetic field generating means 3 is such that the magnetic flux from the DC magnetic field generating means 3 crosses the AC magnetic field generating means 2.
The magnetization may be performed in the same direction, not limited to the directions facing each other as shown in FIG. In addition, the magnetization direction may not be parallel to the object 1 but may be a direction perpendicular to the object 1 or a direction oblique to the object 1.
【００２８】図１１は、本発明の誘導加熱装置の、本実
施形態３の概観図である。本実施形態３では、いくつか
の細いブロックに分割し、適当な間隔の隙間を設けて並
べた直流磁場発生手段３を、交流磁場発生手段２と被加
熱体１の間に挟まれる空間内に配置している。直流磁場
発生手段３に隙間を設けたことにより、交流磁場発生手
段２の交流磁場を遮ることがなく、交流磁場発生手段２
により十分に変化を受けた直流磁場発生手段３の磁場を
被加熱体１に作用させることができる。ここで直流磁場
発生手段３の磁化方向は、直流磁場発生手段３からの磁
束が被加熱体１に対して直交する方向とすることが望ま
しいが、図１１に示す磁化方向と逆の方向にしても、又
は交互に磁化方向を逆向きにしても良い。また被加熱体
１に対して直交する磁化方向でなく、被加熱体１に対し
て平行な方向、または被加熱体１に対して斜めの方向で
あっても良い。FIG. 11 is a schematic view of Embodiment 3 of the induction heating apparatus of the present invention. In the third embodiment, the DC magnetic field generating means 3 divided into several thin blocks and arranged with appropriate gaps therebetween is placed in a space sandwiched between the AC magnetic field generating means 2 and the object 1 to be heated. Have been placed. Since the gap is provided in the DC magnetic field generating means 3, the AC magnetic field of the AC magnetic field generating means 2 is not interrupted.
Thus, the magnetic field of the DC magnetic field generating means 3 which has been sufficiently changed can be applied to the object to be heated 1. Here, the magnetization direction of the DC magnetic field generating means 3 is desirably a direction in which the magnetic flux from the DC magnetic field generating means 3 is orthogonal to the object 1 to be heated. Alternatively, the magnetization directions may be alternately reversed. In addition, the magnetization direction may be a direction parallel to the heated object 1 or a direction oblique to the heated object 1 instead of the magnetization direction orthogonal to the heated object 1.
【００２９】また直流磁場発生手段３を、交流磁場発生
手段２の交流磁界を遮断してしまうことが無い程度の大
きさとする場合には、図１１に示したように直流磁場発
生手段３を分割して隙間を設ける必要は無い。When the DC magnetic field generating means 3 is set to such a size that the AC magnetic field of the AC magnetic field generating means 2 is not interrupted, the DC magnetic field generating means 3 is divided as shown in FIG. There is no need to provide a gap.
【００３０】図１２は、本実施形態２（ｃ）又は本実施
形態３（ｄ）の、コイルの長手方向に沿った被加熱体表
面（Ａ１−Ａ２）のジュール損失量分布、図１３は被加
熱体表面中央部（Ｂ１−Ｂ２）のジュール損失量分布、
図１４は被加熱体表面端部近傍（Ｃ１−Ｃ２）のジュー
ル損失量分布である。なお比較として従来例（ａ）のジ
ュール損失量分布をあわせて示す。FIG. 12 shows the Joule loss distribution on the surface (A1-A2) of the object to be heated along the longitudinal direction of the coil in the embodiment 2 (c) or 3 (d), and FIG. Joule loss distribution at the center (B1-B2) of the heating element surface,
FIG. 14 is a Joule loss distribution near the edge of the surface of the object to be heated (C1-C2). For comparison, the Joule loss distribution of the conventional example (a) is also shown.
【００３１】本実施形態２（ｃ）、本実施形態３（ｄ）
は、どちらもジュール損失量が従来例（ａ）に比べ数倍
に増加し、被加熱体１の表面温度を急速に上昇させるこ
とができる。またどちらの本実施形態も、本実施形態１
に比べて被加熱体１に近い位置に直流磁場発生手段３を
配置するため、少ない量で有効に同等の磁束量を被加熱
体１に作用させることができるため、コスト的にも有利
である。Embodiment 2 (c), Embodiment 3 (d)
In both cases, the Joule loss increases several times as compared with the conventional example (a), and the surface temperature of the object 1 can be rapidly increased. Also, in both embodiments, the first embodiment
Since the direct-current magnetic field generating means 3 is arranged at a position closer to the object 1 to be heated, the same amount of magnetic flux can be effectively applied to the object 1 with a small amount, which is advantageous in cost. .
【００３２】ここで本発明の誘導加熱装置では、直流磁
場発生手段３である永久磁石の残留磁束密度又は使用
量、交流磁場発生手段２であるコイルに流す電流又は周
波数の調整により、ジュール損失量を容易に変えること
ができる。Here, in the induction heating apparatus of the present invention, the Joule loss amount is adjusted by adjusting the residual magnetic flux density or the amount of use of the permanent magnet as the DC magnetic field generating means 3 and the current or frequency flowing through the coil as the AC magnetic field generating means 2. Can be easily changed.
【００３３】直流磁場発生手段３の残留磁束密度と使用
量とジュール損失量の関係を示す。残留磁束密度は着磁
磁場の大きさや使用する永久磁石の種類の変更により調
整でき、使用量は体積（例えば厚みなど）で簡単に調整
することができる。The relationship between the residual magnetic flux density of the DC magnetic field generating means 3, the amount used, and the Joule loss is shown. The residual magnetic flux density can be adjusted by changing the magnitude of the magnetizing magnetic field and the type of the permanent magnet to be used, and the amount of use can be easily adjusted by volume (for example, thickness).
【００３４】本実施形態１の図２に示した磁化方向にお
いて、交流磁場発生手段２の電流値、周波数は一定とし
た場合の、直流磁場発生手段３の残留磁束密度又は厚み
とジュール損失量との関係を以下に示す。In the magnetization direction shown in FIG. 2 of the first embodiment, when the current value and the frequency of the AC magnetic field generating means 2 are constant, the residual magnetic flux density or thickness of the DC magnetic field generating means 3 and the Joule loss amount Is shown below.
【００３５】図１５は直流磁場発生手段３の残留磁束密
度を変えた場合の、交流磁場発生手段２の長手方向に沿
った被加熱体表面（Ａ１−Ａ２）のジュール損失量分布
であり、図１６は直流磁場発生手段３の厚みを変えた場
合の、交流磁場発生手段２の長手方向に沿った被加熱体
表面（Ａ１−Ａ２）のジュール損失量分布である。FIG. 15 shows the Joule loss distribution on the surface (A1-A2) of the object to be heated along the longitudinal direction of the AC magnetic field generating means 2 when the residual magnetic flux density of the DC magnetic field generating means 3 is changed. Reference numeral 16 denotes a Joule loss distribution on the surface (A1-A2) of the object to be heated along the longitudinal direction of the AC magnetic field generating means 2 when the thickness of the DC magnetic field generating means 3 is changed.
【００３６】ここで、（ｅ）は直流磁場発生手段３の残
留磁束密度を基準値の１／２の０．４Ｔに減らした場
合、（ｆ）は使用する直流磁場発生手段３をサマリウム
・コバルト系ボンド磁石の磁気特性からサマリウム・コ
バルト系焼結磁石の磁気特性に変更して、残留磁束密度
を約１．５倍の１．１５Ｔに増やした場合、（ｇ）直流
磁場発生手段３の厚みを約１／２とした場合、（ｈ）は
直流磁場発生手段３の厚みを約１．５倍とした場合のジ
ュール損失量分布をそれぞれ示している。なお比較とし
て、前述の本実施形態１（ｂ）と従来例（ａ）のジュー
ル損失量分布をあわせて示す。Here, (e) shows the case where the residual magnetic flux density of the DC magnetic field generating means 3 is reduced to 0.4T which is 1/2 of the reference value, and (f) shows that the DC magnetic field generating means 3 used is samarium-cobalt. (G) thickness of the DC magnetic field generating means 3 when the residual magnetic flux density is increased to about 1.5 times 1.15T by changing the magnetic properties of the system-based bonded magnet to the magnetic properties of a samarium-cobalt sintered magnet. (H) shows the Joule loss distribution when the thickness of the DC magnetic field generating means 3 is about 1.5 times. For comparison, the Joule loss distributions of Embodiment 1 (b) and Conventional Example (a) are also shown.
【００３７】ジュール損失量の全ての評価部位におい
て、直流磁場発生手段３の残留磁束密度を約１／２とし
た場合、ジュール損失量は本実施形態１（ｂ）の約半分
に低下するが、従来例に比べ約3倍のジュール損失量が
確保できる。また直流磁場発生手段３の残留磁束密度を
１．５倍とした場合には、本実施形態１（ｂ）に比べ、
ジュール損失量を約2倍に増加させることができる。When the residual magnetic flux density of the DC magnetic field generating means 3 is reduced to about に お い て at all the evaluation sites of the Joule loss, the Joule loss is reduced to about half of the embodiment 1 (b). About three times the joule loss compared to the conventional example can be secured. When the residual magnetic flux density of the DC magnetic field generating means 3 is set to 1.5 times, compared with the first embodiment (b),
Joule loss can be increased about twice.
【００３８】また直流磁場発生手段３の厚みを約１／２
とした場合も、ジュール損失量は本実施形態１（ｂ）の
約半分に低下するが、従来例に比べ約3倍のジュール損
失量が確保できる。また直流磁場発生手段３の厚みを
１．５倍とした場合も、本実施形態１（ｂ）に比べ、ジ
ュール損失量を約2倍に増加させることができる。The thickness of the DC magnetic field generating means 3 is reduced to about 1/2.
In this case, the Joule loss amount is reduced to about half that of the first embodiment (b), but the Joule loss amount can be secured about three times that of the conventional example. Also, when the thickness of the DC magnetic field generating means 3 is 1.5 times, the Joule loss can be increased about twice as compared with the first embodiment (b).
【００３９】このように、直流磁場発生手段３の残留磁
束密度と使用量を調整して、被加熱体１に作用する総磁
束量を調整することにより、従来よりも多くのジュール
損失量を確保しつつ、総磁束量に応じたジュール損失量
を得ることができる。As described above, by adjusting the residual magnetic flux density and the amount of use of the DC magnetic field generating means 3 to adjust the total magnetic flux acting on the object 1 to be heated, a larger Joule loss than before can be secured. In addition, a Joule loss amount corresponding to the total magnetic flux amount can be obtained.
【００４０】次に、本実施形態１の図２に示した磁化方
向において、直流磁場発生手段３の残留磁束密度と使用
量を一定した条件での、交流磁場発生手段２に流す電流
値又は周波数とジュール損失量との関係を以下に示す。Next, in the magnetization direction shown in FIG. 2 of the first embodiment, the current value or frequency flowing through the AC magnetic field generating means 2 under the condition that the residual magnetic flux density and the usage amount of the DC magnetic field generating means 3 are constant. The relationship between and Joule loss is shown below.
【００４１】図１７は、交流磁場発生手段２の電流値を
変えた時の、交流磁場発生手段２の長手方向に沿った被
加熱体表面（Ａ１−Ａ２）のジュール損失量分布であ
る。（ｉ）は電流値を基準値の２分の１の２５Ａとした
場合、（ｊ）は基準値の５０分の１の１Ａとした場合の
各ジュール損失量を示している。なお比較として、前述
の本実施例１（ｂ）と従来例（ａ）のジュール損失量分
布をあわせて示す。FIG. 17 shows the Joule loss distribution on the surface (A1-A2) of the object to be heated along the longitudinal direction of the AC magnetic field generating means 2 when the current value of the AC magnetic field generating means 2 is changed. (I) shows the amount of Joule loss when the current value is set to 25 A, which is 1/2 of the reference value, and (j) shows each Joule loss amount when the current value is set to 1 A, which is 1/50 of the reference value. For comparison, the Joule loss distributions of Example 1 (b) and Conventional Example (a) are also shown.
【００４２】電流値を下げるとジュール損失量は低下す
るが、電流値を１Ａと大幅に基準値よりも小さくして
も、ジュール損失量の約１／２にしか低下しない。When the current value is reduced, the Joule loss is reduced. However, even if the current value is significantly reduced to 1 A, which is smaller than the reference value, the Joule loss is reduced to only about 1/2 of the Joule loss.
【００４３】このように、本発明の誘導加熱装置の加熱
特性は、交流磁場発生手段２に流す電流に対する依存性
は非常に小さく、電流値を大幅に低く設定しても従来に
比べより多くのジュール損失量を得ることができる。こ
のことから、定着装置の消費電力を大幅に低減すること
ができ、同時に電気回路の負荷が軽減できるため、耐久
性、長寿命化に有利な誘導加熱装置であると言える。As described above, the heating characteristic of the induction heating apparatus of the present invention has a very small dependence on the current flowing through the AC magnetic field generating means 2, and even if the current value is set to be significantly lower, the heating characteristic becomes larger than in the conventional case. Joule loss can be obtained. From this, it can be said that the power consumption of the fixing device can be significantly reduced, and at the same time, the load on the electric circuit can be reduced, so that the induction heating device is advantageous for durability and long life.
【００４４】図１８は、交流磁場発生手段２の電流周波
数を変えた時の、交流磁場発生手段２の長手方向に沿っ
た被加熱体表面（Ａ１−Ａ２）のジュール損失量分布で
ある。（ｋ）は基準値の１．５倍の４５ｋＨｚとした場
合、（ｌ）は基準値の２分の１の１５ｋＨｚとした場合
の各ジュール損失量を示している。なお比較として、前
述の本実施形態１（ｂ）と従来例（ａ）のジュール損失
量分布をあわせて示す。FIG. 18 is a Joule loss distribution on the surface (A1-A2) of the object to be heated along the longitudinal direction of the AC magnetic field generating means 2 when the current frequency of the AC magnetic field generating means 2 is changed. (K) shows each Joule loss when the frequency is set to 45 kHz which is 1.5 times the reference value, and (l) shows each Joule loss when the frequency is set to 15 kHz which is half the reference value. For comparison, the Joule loss distributions of Embodiment 1 (b) and Conventional Example (a) are also shown.
【００４５】周波数を１．５倍に上げるとジュール損失
量は約２倍に増加し、周波数を１／２に下げるとジュー
ル損失量が約１／４に低下する。このように、電流の周
波数のジュール損失量への影響は大きく、これは渦電流
損が周波数の２乗に比例して変化することから説明でき
る。このことから電流周波数はできる限り高く設定する
ことが望ましい。When the frequency is increased by a factor of 1.5, the Joule loss increases by a factor of about two, and when the frequency is reduced by a factor of two, the Joule loss decreases by a factor of about four. Thus, the influence of the frequency of the current on the Joule loss is large, which can be explained by the fact that the eddy current loss changes in proportion to the square of the frequency. For this reason, it is desirable to set the current frequency as high as possible.
【００４６】図１９は、交流磁場発生手段２の電流値と
周波数をともに変えた時の、交流磁場発生手段２の長手
方向に沿った被加熱体表面（Ａ１−Ａ２）のジュール損
失量分布である。（m）は電流１Ａ（基準値の５０分の
１）、周波数４５ｋＨｚ（基準値の１．５倍）とした場
合のジュール損失量を示しており、比較として前述の本
実施形態１（ｂ）と従来例（ａ）のジュール損失量分布
をあわせて示す。FIG. 19 shows the Joule loss distribution on the surface (A1-A2) of the object to be heated along the longitudinal direction of the AC magnetic field generating means 2 when the current value and the frequency of the AC magnetic field generating means 2 are both changed. is there. (M) shows the Joule loss when the current is 1 A (1/50 of the reference value) and the frequency is 45 kHz (1.5 times the reference value). And the Joule loss distribution of the conventional example (a).
【００４７】図１９からわかるように、本発明の誘導加
熱装置は僅かな電流でも、周波数を適値に設定すること
により、従来例に比べジュール損失量を大幅に増加させ
ることができ、前述の本実施形態１（ｂ）と同等以上の
ジュール損失量を得ることができる。As can be seen from FIG. 19, the induction heating device of the present invention can greatly increase the Joule loss compared to the conventional example by setting the frequency to an appropriate value even with a small current. A Joule loss equal to or greater than that of the first embodiment (b) can be obtained.
【００４８】すなわち、本発明の誘導加熱装置における
加熱特性は、交流磁場発生手段２に流す電流に対する依
存性が非常に小さく、周波数への依存性が大きいため、
電流値はできる限り低く設定し、周波数をできる限り高
く設定することが、最も適した稼動条件であり、このよ
うな条件で稼動させることにより、従来の誘導加熱装置
に比べ劇的に消費電力を低減しながら、加熱特性の良好
な誘導加熱装置を実現できる。That is, the heating characteristic of the induction heating apparatus of the present invention has a very small dependence on the current flowing through the AC magnetic field generating means 2 and a large dependence on the frequency.
The most suitable operating condition is to set the current value as low as possible and set the frequency as high as possible.By operating under such conditions, the power consumption can be dramatically reduced compared to the conventional induction heating device. An induction heating device having good heating characteristics can be realized while reducing the temperature.
【００４９】また本発明の誘導加熱装置では、加熱むら
の低減に対しては、直流磁場発生手段３の残留磁束密度
に図２０に示すような分布を持たせることで可能とな
る。なお図２０は、直流磁場発生手段３側から被加熱体
１方向に見た上視図である。すなわち、ジュール損失量
が多い中央部に配置する直流磁場発生手段３の残留磁束
密度を低く設定し、一方ジュール損失量が少ない端部に
配置する直流磁場発生手段３の残留磁束密度を高く設定
する。Further, in the induction heating apparatus of the present invention, it is possible to reduce the uneven heating by giving the residual magnetic flux density of the DC magnetic field generating means 3 a distribution as shown in FIG. FIG. 20 is a top view as seen from the DC magnetic field generating means 3 side toward the object 1 to be heated. That is, the residual magnetic flux density of the DC magnetic field generating means 3 arranged at the central portion where the Joule loss is large is set low, while the residual magnetic flux density of the DC magnetic field generating means 3 arranged at the end where the Joule loss is small is set high. .
【００５０】また加熱むらを低減する他の対策として、
図２１に示すように交流磁場発生手段２の端部付近のみ
に直流磁場発生手段３を配置し、交流磁場発生手段２の
中央部付近には直流磁場発生手段３を配置しないような
形態とする。なお図２１は図２０同様、直流磁場発生手
段３側から被加熱体１方向に見た上視図である。As another measure to reduce uneven heating,
As shown in FIG. 21, the DC magnetic field generating means 3 is arranged only near the end of the AC magnetic field generating means 2, and the DC magnetic field generating means 3 is not arranged near the center of the AC magnetic field generating means 2. . Note that FIG. 21 is a top view as viewed in the direction of the heated object 1 from the DC magnetic field generating means 3 side as in FIG.
【００５１】図２２は、加熱むらを低減する２つの対策
についてのジュール損失量分布を示した図であり、
（ｎ）は、直流磁場発生手段３の端部の残留磁束密度分
布を０．８Ｔとし、永久磁石の中央部の残留磁束密度分
布を０．２Ｔとした場合、（ｏ）は図２１に示すような
直流磁場発生手段３の配置を行なった場合の、交流磁場
発生手段の長手方向に沿った被加熱体表面（Ａ１−Ａ
２）のジュール損失量分布を示している。なお比較とし
て、直流磁場発生手段３の残留磁束密度分布を一様に
０．４Ｔとした場合（ｅ）のジュール損失分布をあわせ
て示す。FIG. 22 is a diagram showing Joule loss distributions for two measures to reduce uneven heating.
FIG. 21 (n) shows the case where the residual magnetic flux density distribution at the end of the DC magnetic field generating means 3 is 0.8T and the residual magnetic flux density distribution at the center of the permanent magnet is 0.2T, and FIG. When the DC magnetic field generating means 3 is arranged as described above, the surface of the object to be heated along the longitudinal direction of the AC magnetic field generating means (A1-A
2 shows the Joule loss distribution. For comparison, the Joule loss distribution in (e) when the residual magnetic flux density distribution of the DC magnetic field generating means 3 is uniformly 0.4 T is also shown.
【００５２】直流磁場発生手段３の端部領域の残留磁束
密度を大きく、中央部の残留磁束密度を小さく分布させ
ることにより、直流磁場発生手段３の残留磁束密度分布
を一様に０．４Ｔとした場合に比べ、被加熱体１の端部
付近のジュール損失量を約５０％増加させることがで
き、被加熱体１の中央部のジュール損失量を約１５％程
度の低下に抑えることができる。ここで、中央部と端部
のジュール損失量の差は、直流磁場発生手段３の残留磁
束密度分布を一様に０．４Ｔとした場合が９．５×１０
7Ｗ／ｍ3であるのに対し、直流磁場発生手段３の残留磁
束密度に分布を持たせた場合には７．１×１０7Ｗ／ｍ3
となり、ジュール損失量の差が約２０％低減されたジュ
ール損失量分布が得られるため、加熱むらを低減するこ
とができる。By increasing the residual magnetic flux density in the end region of the DC magnetic field generating means 3 and decreasing the residual magnetic flux density in the central area, the residual magnetic flux density distribution of the DC magnetic field generating means 3 is uniformly reduced to 0.4T. As compared with the case where the heating is performed, the Joule loss amount near the end of the heated body 1 can be increased by about 50%, and the Joule loss amount at the central portion of the heated body 1 can be suppressed to about 15%. . Here, the difference in the Joule loss between the center and the end is 9.5 × 10 when the residual magnetic flux density distribution of the DC magnetic field generating means 3 is uniformly 0.4 T.
7 W / m 3 , whereas the residual magnetic flux density of the DC magnetic field generating means 3 has a distribution of 7.1 × 10 7 W / m 3.
As a result, a Joule loss distribution in which the difference in the Joule loss is reduced by about 20% is obtained, so that uneven heating can be reduced.
【００５３】なお直流磁場発生手段３の残留磁束密度に
分布を持たせる方法としては、同一の直流磁場発生手段
３を用いて厚みを変えて総磁束数を変える方法でも、残
留磁束密度の異なる複数の直流磁場発生手段３を用いる
方法でも良い。また図２０では2種類の残留磁束密度の
異なる直流磁場発生手段３を配置しているが、これに限
らずさらに複数の残留磁束密度の異なる直流磁場発生手
段３を適度に配置することによって、より均一なジュー
ル損失量分布を得ることができる。As a method of giving a distribution to the residual magnetic flux density of the DC magnetic field generating means 3, a method of changing the thickness by using the same DC magnetic field generating means 3 to change the total magnetic flux number may be used. May be used. In FIG. 20, two types of DC magnetic field generating means 3 having different residual magnetic flux densities are arranged. However, the present invention is not limited to this, and by further appropriately arranging a plurality of DC magnetic field generating means 3 having different residual magnetic flux densities, A uniform Joule loss distribution can be obtained.
【００５４】コイル端部付近のみに直流磁場発生手段３
を配置し、コイル中央部付近には配置しない形態とした
場合においても、直流磁場発生手段３の残留磁束密度分
布を一様に０．４Ｔとした場合に比べ、被加熱体１の端
部付近のジュール損失量を約２倍に増加させることがで
き、被加熱体１の中央部のジュール損失量を約１０％の
低下に抑えることができる。ここで中央部と端部のジュ
ール損失量の差は、直流磁場発生手段３の残留磁束密度
分布を一様に０．４Ｔとした場合が９．５×１０7Ｗ／
ｍ3であるのに対し、コイル端部付近のみに直流磁場発
生手段３を配置した場合には６．６×１０7Ｗ／ｍ3とな
り、ジュール損失量の差が約３０％低減されたジュール
損失量分布が得られるため、加熱むらを低減することが
できる。DC magnetic field generating means 3 is provided only near the coil end.
Is arranged near the center of the coil 1 even when the residual magnetic flux density distribution of the DC magnetic field generating means 3 is uniformly set to 0.4T. Can be increased about twice, and the Joule loss in the central portion of the object to be heated 1 can be suppressed to about 10%. Here, the difference in the Joule loss between the center and the end is 9.5 × 10 7 W / when the residual magnetic flux density distribution of the DC magnetic field generating means 3 is uniformly 0.4 T.
m 3 , when the DC magnetic field generating means 3 is arranged only near the end of the coil, it becomes 6.6 × 10 7 W / m 3 , and the joule loss difference is reduced by about 30%. Since a loss distribution is obtained, uneven heating can be reduced.
【００５５】図２３は、本発明の誘導加熱装置より構成
された定着装置の実施形態１を側面から見た断面図であ
り、図２４は定着装置の実施形態１を端部から見た図で
ある。FIG. 23 is a cross-sectional view of Embodiment 1 of the fixing device constituted by the induction heating device of the present invention as viewed from the side, and FIG. 24 is a diagram of Embodiment 1 of the fixing device viewed from the end. is there.
【００５６】定着装置は、回転軸６に固着され、表面が
被加熱体１で覆われた定着ローラ７と、被加熱体１を誘
導加熱するために被加熱体１を覆うように一定のギャッ
プを保持して配置した交流磁場発生手段２と、交流磁場
発生手段２の外側に適度な距離をおいて配置した直流磁
場発生手段３から構成される。The fixing device is fixed to the rotating shaft 6 and has a fixed gap between the fixing roller 7 whose surface is covered with the object to be heated 1 and the object to be heated 1 for induction heating of the object to be heated 1. And a DC magnetic field generating means 3 arranged outside the AC magnetic field generating means 2 at an appropriate distance from the AC magnetic field generating means 2.
【００５７】ここで直流磁場発生手段３には永久磁石を
使用し、鉄やパーマロイなどの軟磁性材料に対して極め
て導電率の低い特性を持つもの、例えばサマリウム・コ
バルト系ボンド永久磁石を使用する。その結果、永久磁
石表面に発生する渦電流を劇的に小さくでき、磁石の熱
減磁を防ぐことができる。また直流磁場発生手段３であ
る永久磁石は、図２４中に太矢印で示したように、全て
の領域において一様に被加熱体１に対し直交する方向、
すなわちラジアル方向に着磁されている。Here, a permanent magnet is used for the DC magnetic field generating means 3, and a permanent magnet having a very low conductivity with respect to a soft magnetic material such as iron or permalloy, for example, a samarium-cobalt bond permanent magnet is used. . As a result, the eddy current generated on the surface of the permanent magnet can be dramatically reduced, and thermal demagnetization of the magnet can be prevented. In addition, the permanent magnet which is the DC magnetic field generating means 3 has a direction perpendicular to the object to be heated 1 uniformly in all regions, as indicated by a thick arrow in FIG.
That is, it is magnetized in the radial direction.
【００５８】以上のように構成されている定着装置の実
施形態１について、磁界解析手法を用いてその加熱特性
を確認した。The heating characteristics of the fixing device having the above-described configuration according to the first embodiment were confirmed using a magnetic field analysis technique.
【００５９】被加熱体１には磁性ステンレス材料SＵＳ
４３０の直流初磁化ＢＨ曲線の測定値を与え、その厚み
を０．０８mmとした。また導電率は被加熱体１の表面温
度が２００℃以上に達することを考慮し、室温時の約１
／２の８．８５×１０5Ｓ／ｍとした。回転軸６と軸受
８の材質は一般的な鉄として扱い、炭素鋼の直流初磁化
ＢＨ曲線の測定値を与え、その導電率は１．０×１０7
Ｓ／ｍとした。被加熱体１と交流磁場発生手段２のギャ
ップを3mmとし、交流磁場発生手段２に流す電流を２７
A、周波数は３０ｋHzとした。また直流磁場発生手段３
である永久磁石の磁気特性と電気特性は、それぞれ残留
磁束密度０．８Ｔ、導電率２．３×１０ 3 Ｓ／ｍであ
り、磁化条件は完全着磁とした。なお定着ローラ２にお
いては、被加熱体１と回転軸７との間は、発泡シリコン
等の弾性体で構成されており、磁気特性としては空気と
同様の扱いとした。The material 1 to be heated is made of a magnetic stainless steel material SUS.
430 gives the measured value of the DC initial magnetization BH curve,
Was set to 0.08 mm. The conductivity is the surface temperature of the object 1 to be heated.
Considering that the temperature reaches 200 ° C or more, about 1
8.85 × 10/2FiveS / m. Rotating shaft 6 and bearing
Material 8 is treated as general iron, DC initial magnetization of carbon steel
The measured value of the BH curve is given and its conductivity is 1.0 × 107
S / m. Gap between the object to be heated 1 and the AC magnetic field generating means 2
The current flowing through the AC magnetic field generating means 2 is 27 mm.
A, the frequency was 30 kHz. DC magnetic field generating means 3
The magnetic and electrical properties of the permanent magnet
Magnetic flux density 0.8T, conductivity 2.3 × 10 Three S / m
The magnetizing conditions were perfect magnetization. Note that the fixing roller 2
In addition, the space between the heating target 1 and the rotating shaft 7 is made of foamed silicon.
Etc., and has magnetic properties of air and
Treated in the same way.
【００６０】加熱特性の評価基準としては、被加熱体１
表面のジュール損失量（W／m3）を用いる。The evaluation criteria of the heating characteristics are as follows.
The surface joule loss (W / m 3 ) is used.
【００６１】図２５はジュール損失量の評価部位を示す
図であり、被加熱体１、交流磁場発生手段２、回転軸６
および軸受８を示した上視図である。ジュール損失量の
評価部位は、交流磁場発生手段２長手方向に沿った被加
熱体１表面(D１−D２)、交流磁場発生手段２に覆われた
幅領域の被加熱体１表面(E１−E２) および交流磁場発
生手段２に覆われた長手方向の被加熱体１表面(F１−F
２)であり、解析対象の形状が対称形であるため、定着
装置長手方向および幅領域ともに半分の領域について評
価する。FIG. 25 is a view showing a portion to be evaluated for the Joule loss amount. The object to be heated 1, the AC magnetic field generating means 2, the rotating shaft 6
FIG. The part to be evaluated for the Joule loss amount includes the surface of the heated object 1 (D1-D2) along the longitudinal direction of the AC magnetic field generating means 2 and the surface of the heated object 1 (E1-E2) in the width region covered by the AC magnetic field generating means 2. ) And the surface of the heating target 1 in the longitudinal direction covered with the AC magnetic field generating means 2 (F1-F
2) Since the shape of the analysis target is symmetrical, evaluation is made for a half area in both the longitudinal direction and the width area of the fixing device.
【００６２】図２６は直流磁場発生装置３を配置しない
従来例および直流磁場発生装置３を配置した定着装置の
実施形態１の、交流磁場発生手段２の中心部長手方向に
沿った被加熱体１表面(D１−D２)のジュール損失量を示
す図である。FIG. 26 shows the heating target 1 along the longitudinal direction of the center of the AC magnetic field generating means 2 in the conventional example in which the DC magnetic field generating device 3 is not provided and the fixing device in which the DC magnetic field generating device 3 is provided in the first embodiment. It is a figure which shows the Joule loss amount of the surface (D1-D2).
【００６３】図２７は直流磁場発生装置３を配置しない
従来例および直流磁場発生装置３を配置した定着装置の
実施形態１の、交流磁場発生手段２に覆われた幅領域の
被加熱体１表面(E１−E２)のジュール損失量を示す図で
ある。FIG. 27 shows the surface of the object to be heated 1 in the width region covered with the AC magnetic field generating means 2 in the conventional example in which the DC magnetic field generating device 3 is not provided and the fixing device in which the DC magnetic field generating device 3 is provided in the first embodiment. It is a figure which shows the Joule loss amount of (E1-E2).
【００６４】図２８は直流磁場発生装置３を配置しない
従来例および直流磁場発生装置３を配置した定着装置の
実施形態１の、交流磁場発生手段２に覆われた長手方向
の被加熱体１表面(F１−F２)のジュール損失量を示す図
である。FIG. 28 shows the surface of the object 1 to be heated in the longitudinal direction covered with the AC magnetic field generating means 2 in the conventional example in which the DC magnetic field generating device 3 is not provided and the fixing device in which the DC magnetic field generating device 3 is provided in the first embodiment. It is a figure which shows the Joule loss amount of (F1-F2).
【００６５】これらの図が示すように、直流磁場発生装
置３を配置した定着装置の実施形態１の場合、被加熱体
１表面の全ての領域においてジュール損失量は増加して
おり、とりわけ交流磁場発生手段２に覆われた長手方向
については約１０倍に増加する。As shown in these figures, in the case of the first embodiment of the fixing device in which the DC magnetic field generator 3 is disposed, the Joule loss is increased in all the areas on the surface of the object 1 to be heated. It increases about 10 times in the longitudinal direction covered by the generating means 2.
【００６６】これは、前記本発明の誘導加熱装置と同
様、以下のように説明できる。This can be explained as follows, similarly to the induction heating apparatus of the present invention.
【００６７】被加熱体１には、直流磁場発生手段３が形
成している磁場によりある一定の磁束が流れている。そ
の磁束量は、被加熱体１が磁気飽和しない程度としてい
るため、被加熱体１の磁気特性は透磁率が高い状態にあ
る。このような状態において、交流磁場発生手段２によ
る交流磁場を作用させると、小さな交流磁場の変化で
も、被加熱体１に流れる磁束に大きな変化が生じるた
め、被加熱体１に効率よく渦電流が発生し、ジュール損
失量が大幅に増加する。A certain magnetic flux flows through the object 1 due to the magnetic field formed by the DC magnetic field generating means 3. Since the amount of magnetic flux is such that the object to be heated 1 is not magnetically saturated, the magnetic characteristics of the object to be heated 1 are in a state of high magnetic permeability. In such a state, when an AC magnetic field is applied by the AC magnetic field generating means 2, even a small change in the AC magnetic field causes a large change in the magnetic flux flowing through the object 1 to be heated. Occurs and the amount of Joule loss increases significantly.
【００６８】すなわち、直流磁場発生手段３が形成して
いる空間磁場が、被加熱体１に対し、被加熱体１を磁気
飽和させない程度に作用していれば、交流磁場発生手段
２により効率よく加熱体１に渦電流を発生させることが
できるので、例えば図２９、図３０又は図３１に示すよ
うに、直流磁場発生手段３の形状の変更および磁化方向
を設定した場合でも、効果的に被加熱体１に渦電流を発
生させ、ジュール損失量を増加させることができる。That is, if the spatial magnetic field formed by the DC magnetic field generating means 3 acts on the heated object 1 to such an extent that the heated object 1 is not magnetically saturated, the AC magnetic field generating means 2 can efficiently operate the AC magnetic field generating means 2. Since an eddy current can be generated in the heating element 1, even if the shape of the DC magnetic field generating means 3 is changed and the magnetization direction is set as shown in FIG. 29, FIG. 30, or FIG. An eddy current can be generated in the heater 1 to increase the Joule loss.
【００６９】また図１０に示した本発明の誘導加熱装置
の本実施形態２または図１１に示した本発明の誘導加熱
装置の本実施形態３のように、直流磁場発生手段３を配
置する位置を、被加熱体１と交流磁場発生手段２に挟ま
れた空間領域内とし、被加熱体１の近傍に配置しても、
いくつかの細いブロックに分割して適当な間隔の隙間を
設けて並べても、効果的に被加熱体１に渦電流を発生さ
せ、ジュール損失量を増加させることができる。Further, as in the second embodiment of the induction heating apparatus of the present invention shown in FIG. 10 or the third embodiment of the induction heating apparatus of the present invention shown in FIG. Is set in a space region sandwiched between the object to be heated 1 and the AC magnetic field generating means 2, and is disposed in the vicinity of the object to be heated 1.
Even if it is divided into several thin blocks and arranged with a gap at an appropriate interval, an eddy current can be effectively generated in the object 1 to be heated, and the Joule loss can be increased.
【００７０】以上のことから、被加熱体１の熱容量が一
定である条件において、加熱量を大幅に増加させること
ができるため、被加熱体１の表面温度を急速に上昇させ
ることができる。その結果、従来の定着装置に比べ劇的
に消費電力を低減しながら、加熱特性の良好な定着装置
を実現できる。As described above, under the condition that the heat capacity of the object to be heated 1 is constant, the amount of heating can be greatly increased, so that the surface temperature of the object to be heated 1 can be rapidly increased. As a result, it is possible to realize a fixing device having good heating characteristics while dramatically reducing power consumption as compared with the conventional fixing device.
【００７１】また本発明の誘導加熱装置より構成された
定着装置の加熱むらの低減に対しては、以下のような構
成により実現できる。Further, reduction of uneven heating of the fixing device constituted by the induction heating device of the present invention can be realized by the following constitution.
【００７２】図３２は、本発明の誘導加熱装置より構成
された定着装置の実施形態２を側面から見た断面図であ
る。定着装置は、回転軸６に固着され、表面が被加熱体
１で覆われた定着ローラ７と、被加熱体を覆うように一
定のギャップを保持して配置し、被加熱体１を誘導加熱
するための交流磁場発生手段２と、さらに定着ローラ両
端面から適度に離した位置に、回転軸６にベアリング９
を介して自由に回転することを可能として配置した直流
磁場発生手段３から構成される。FIG. 32 is a sectional view of Embodiment 2 of the fixing device constituted by the induction heating device of the present invention, as viewed from the side. The fixing device is fixed to a rotating shaft 6 and has a fixing roller 7 whose surface is covered with the object 1 to be heated, and is arranged with a fixed gap so as to cover the object to be heated. And a bearing 9 mounted on the rotating shaft 6 at an appropriate distance from both ends of the fixing roller.
And a direct-current magnetic field generating means 3 arranged so as to be able to rotate freely via the.
【００７３】図３３は定着装置の実施形態２における直
流磁場発生装置３の構成を示す図である。ここで直流磁
場発生手段３には永久磁石を使用し、鉄やパーマロイな
どの軟磁性材料に対して極めて導電率の低い特性を持つ
もの、例えばサマリウム・コバルト系ボンド永久磁石を
使用する。その結果、永久磁石表面に発生する渦電流を
劇的に小さくでき、磁石の熱減磁を防ぐことができる。
ドーナツ状に成形した直流磁場発生手段３はベアリング
９に固着され、ベアリング８を介して回転軸６に取り付
けられている。よって、直流磁場発生装置３は定着ロー
ラの回転とは無関係に自由に回転できるため、直流磁場
発生装置３の磁界に対して交流磁場発生手段２の磁界が
及ぼす磁気的な力が、定着ローラの回転に対し作用する
ことを防止できる。FIG. 33 is a diagram showing the configuration of the DC magnetic field generator 3 in Embodiment 2 of the fixing device. Here, a permanent magnet is used as the DC magnetic field generating means 3, and a permanent magnet having an extremely low conductivity with respect to a soft magnetic material such as iron or permalloy, for example, a samarium-cobalt bond permanent magnet is used. As a result, the eddy current generated on the surface of the permanent magnet can be dramatically reduced, and thermal demagnetization of the magnet can be prevented.
The doughnut-shaped DC magnetic field generating means 3 is fixed to a bearing 9 and attached to the rotating shaft 6 via the bearing 8. Therefore, since the DC magnetic field generator 3 can rotate freely regardless of the rotation of the fixing roller, the magnetic force exerted by the magnetic field of the AC magnetic field generator 2 on the magnetic field of the DC magnetic field generator 3 causes the magnetic force of the fixing roller to change. Acting on rotation can be prevented.
【００７４】図３４は定着装置の実施形態２における直
流磁場発生装置３である永久磁石の着磁状態を示す図で
ある。図３４中において太矢印が示すように、磁石中
心、すなわち回転軸６を中心としてラジアル方向に着磁
されている。これにより、磁石近傍に存在する軟磁性体
で構成された被加熱体１のより広い表面の領域に対し
て、磁石から流れ出すより多くの磁束を作用させること
ができる。FIG. 34 is a view showing a magnetized state of a permanent magnet which is the DC magnetic field generator 3 in the second embodiment of the fixing device. As shown by a thick arrow in FIG. 34, the magnet is magnetized in the radial direction about the center of the magnet, that is, the rotation shaft 6. Thereby, more magnetic flux flowing out of the magnet can be made to act on a wider surface region of the object to be heated 1 made of a soft magnetic material existing near the magnet.
【００７５】以上のように構成された定着装置の実施形
態２について磁界解析手法および熱伝導解析手法を用い
て、その加熱特性を確認した。The heating characteristics of the second embodiment of the fixing device configured as described above were confirmed using a magnetic field analysis method and a heat conduction analysis method.
【００７６】磁界解析について説明する。被加熱体１に
は磁性ステンレス材料ＳＵＳ４３０の直流初磁化ＢＨ曲
線の測定値を与え、その厚みを０．０８ｍｍとした。ま
た導電率は被加熱体１の表面温度が２００℃以上に達す
ることを考慮し、室温時の約１／２の８．８５×１０5
Ｓ／ｍとした。回転軸６と軸受８の材質は一般的な鉄と
して扱い、炭素鋼の直流初磁化ＢＨ曲線の測定値を与
え、その導電率は１．０×１０7Ｓ／ｍとした。被加熱
体１と交流磁場発生手段２のギャップを３mmとし、交流
磁場発生手段２に流す電流を２７A、周波数は３０ｋHz
とした。また直流磁場発生手段３である永久磁石の磁気
特性と電気特性は、それぞれ残留磁束密度０．８Ｔ、導
電率２．３×１０3 Ｓ／ｍであり、磁化条件は２０００
００Ａ／ｍとした。なお定着ローラ２においては、被加
熱体１と回転軸６との間は、発泡シリコン等の弾性体で
構成されており、磁気特性としては空気と同様の扱いと
した。The magnetic field analysis will be described. The measured value of the DC initial magnetization BH curve of the magnetic stainless steel material SUS430 was given to the object 1 to be heated, and the thickness thereof was set to 0.08 mm. Considering that the surface temperature of the body 1 to be heated reaches 200 ° C. or higher, the conductivity is 8.85 × 10 5 which is about の of the room temperature.
S / m. The material of the rotating shaft 6 and the bearing 8 was treated as general iron, and the measured value of the DC initial magnetization BH curve of carbon steel was given, and the conductivity was 1.0 × 10 7 S / m. The gap between the object to be heated 1 and the AC magnetic field generating means 2 is 3 mm, the current flowing through the AC magnetic field generating means 2 is 27 A, and the frequency is 30 kHz.
And The permanent magnet as the DC magnetic field generating means 3 has a magnetic property and an electric property of a residual magnetic flux density of 0.8 T and a conductivity of 2.3 × 10 3 S / m, respectively, and a magnetization condition of 2,000.
00 A / m. In the fixing roller 2, the space between the heated body 1 and the rotating shaft 6 is made of an elastic body such as foamed silicon, and the magnetic properties are the same as those of air.
【００７７】以上の条件において磁界解析より求められ
たジュール損失量（W／ｍ3）を発熱源として、熱伝導解
析を行う。本熱伝導解析において用いた、各材質の熱伝
導率（Ｗ／ｍ・Ｋ）、比熱（Ｊ／ｋｇ・Ｋ）、密度（Ｋｇ
／ｍ3）を表１に示す。A heat conduction analysis is performed using the Joule loss (W / m 3 ) obtained by the magnetic field analysis under the above conditions as a heat source. The thermal conductivity (W / m · K), specific heat (J / kg · K), density (Kg) of each material used in this heat conduction analysis
/ M 3 ) are shown in Table 1.
【００７８】表１ Table 1
【００７９】次に、各部位に設定した熱伝達係数（Ｗ／
ｍ2・Ｋ）を表２に示す。Next, the heat transfer coefficient (W /
m 2 · K) are shown in Table 2.
【００８０】表２ Table 2
【００８１】以上の解析条件において、初期温度を２０
℃とし、１０秒刻みに温度分布の変化を求めた。Under the above analysis conditions, the initial temperature was set at 20.
° C, and the change in temperature distribution was determined every 10 seconds.
【００８２】加熱特性の評価は、被加熱体１の特定箇所
の表面温度で行った。The evaluation of the heating characteristics was performed at the surface temperature of a specific portion of the object 1 to be heated.
【００８３】図３５は、定着装置の実施形態２につい
て、交流磁場発生手段２の真上から見た概観図である。
図３５中、Ｐ１からＰ５の計5箇所について、被加熱体
１の表面温度の時間変化を調べた。FIG. 35 is a schematic view of Embodiment 2 of the fixing device as viewed from directly above the AC magnetic field generating means 2.
In FIG. 35, the time change of the surface temperature of the object to be heated 1 was examined for a total of five points P1 to P5.
【００８４】図３６は、直流磁場発生装置を配置しない
従来例の、各評価箇所での温度変化を示す図である。FIG. 36 is a diagram showing a temperature change at each evaluation point in a conventional example in which a DC magnetic field generator is not arranged.
【００８５】図３７は直流磁場発生装置を配置した定着
装置の実施形態２の各評価箇所での温度変化を示す図で
ある。FIG. 37 is a diagram showing a temperature change at each evaluation point in Embodiment 2 of the fixing device in which the DC magnetic field generator is arranged.
【００８６】直流磁場発生装置を配置しない従来例で
は、定着ローラ端部付近のP４およびP5の温度が他の箇
所に比べ高く、定着ローラの中心付近の温度が約１５０
℃となる時間では、３００℃を超えており、図３６中に
矢印で示した温度差は約１７０℃である。In the conventional example in which the DC magnetic field generator is not provided, the temperatures of P4 and P5 near the end of the fixing roller are higher than those of other parts, and the temperature near the center of the fixing roller is about 150 ° C.
The time at which the temperature reaches ° C exceeds 300 ° C, and the temperature difference indicated by the arrow in FIG. 36 is approximately 170 ° C.
【００８７】これに対し直流磁場発生装置を配置した定
着装置の実施形態２では、定着ローラ端部付近のP４お
よびP5の温度は他の箇所に比べ高いが、定着ローラの中
心付近の温度が約１５０℃となる時間では２００℃程度
であり、図３７中に矢印で示した温度差は約６０℃と小
さい。On the other hand, in Embodiment 2 of the fixing device in which the DC magnetic field generating device is arranged, the temperatures of P4 and P5 near the end of the fixing roller are higher than those of other portions, but the temperature near the center of the fixing roller is about The temperature at which the temperature reaches 150 ° C. is about 200 ° C., and the temperature difference indicated by the arrow in FIG. 37 is as small as about 60 ° C.
【００８８】このように、直流磁場発生装置を定着ロー
ラの両端部に配置することにより、定着ローラ端部での
温度上昇が抑えられ、従来例に比べて定着ローラの表面
温度分布を均一化することができ、これに起因する定着
むらを低減できる。By arranging the DC magnetic field generators at both ends of the fixing roller as described above, the temperature rise at the end of the fixing roller is suppressed, and the surface temperature distribution of the fixing roller is made uniform as compared with the conventional example. And uneven fixing due to this can be reduced.
【００８９】[0089]
【発明の効果】本発明によれば、導電性の被加熱体と交
流磁場発生手段から構成される誘導加熱装置において、
直流磁場発生手段を設け、直流磁場発生手段を永久磁石
とし、直流磁場発生手段により発生している直流磁場の
磁束密度が０．００１Ｔ以上である領域内に、前記交流
磁場発生手段を配置するような構成とし、直流磁場発生
手段が発生する磁場に交流磁場発生手段が発生する交流
磁場を作用させることにより、被加熱体の透磁率が高い
状態においては、小さな交流磁場の変化でも、被加熱体
に流れる磁束に大きな変化が生じさせることができる。
よって、被加熱体表面において効果的に大きな渦電流が
発生し、被加熱体を急速に加熱することができる。According to the present invention, there is provided an induction heating apparatus comprising a conductive object to be heated and an AC magnetic field generating means.
DC magnetic field generating means is provided, the DC magnetic field generating means is a permanent magnet, and the AC magnetic field generating means is arranged in a region where the magnetic flux density of the DC magnetic field generated by the DC magnetic field generating means is 0.001 T or more. By applying the AC magnetic field generated by the AC magnetic field generating means to the magnetic field generated by the DC magnetic field generating means, when the magnetic permeability of the heated body is high, even a small change in the AC magnetic field can cause A large change can be caused in the magnetic flux flowing through the motor.
Therefore, a large eddy current is effectively generated on the surface of the object to be heated, and the object to be heated can be rapidly heated.
【００９０】また交流磁場発生手段の交流電流を大幅に
低減し、周波数を適値に設定することにより、従来に比
べ大幅に加熱特性を向上させつつ、誘導加熱装置の消費
電力を大幅に低減でき、耐久性、長寿命化に面でも優れ
た誘導加熱装置とすることができる。Further, by greatly reducing the AC current of the AC magnetic field generating means and setting the frequency to an appropriate value, the power consumption of the induction heating device can be greatly reduced while the heating characteristics are greatly improved as compared with the conventional case. It is possible to provide an induction heating device which is excellent in terms of durability, durability and life.
【００９１】また直流磁場発生手段として使用する永久
磁石の残留磁束密度に分布を与えたり、又は部分的に厚
みを異ならせることにより、加熱むらの少ない誘導加熱
装置とすることができる。Further, by giving a distribution to the residual magnetic flux density of the permanent magnet used as the DC magnetic field generating means, or by partially varying the thickness, an induction heating apparatus with less uneven heating can be obtained.
【００９２】さらに、本発明の誘導加熱装置から構成さ
れた定着装置は、被加熱体の加熱量を大幅に増加させ、
被加熱体の表面温度を急速に上昇させることができた
め、従来の定着装置に比べ劇的に消費電力を低減しなが
ら、良好な加熱特性を実現できる。Further, the fixing device including the induction heating device of the present invention greatly increases the amount of heating of the object to be heated,
Since the surface temperature of the object to be heated can be rapidly increased, excellent heating characteristics can be realized while dramatically reducing power consumption as compared with a conventional fixing device.
【００９３】また直流磁場発生手段である永久磁石を定
着ローラの両端部に配置することにより、従来例の比べ
て定着ローラの表面温度分布を均一化でき、温度むらに
よる定着むらを低減することができる。Further, by disposing permanent magnets, which are DC magnetic field generating means, at both ends of the fixing roller, the surface temperature distribution of the fixing roller can be made uniform as compared with the conventional example, and uneven fixing due to temperature unevenness can be reduced. it can.
【図１】本発明の誘導加熱装置の本実施形態１を示す図FIG. 1 is a diagram showing Embodiment 1 of an induction heating apparatus according to the present invention.
【図２】本実施形態１の直流磁場発生手段の磁化方向を
示す図FIG. 2 is a diagram illustrating a magnetization direction of a DC magnetic field generation unit according to the first embodiment.
【図３】ジュール損失量評価部位を説明する図FIG. 3 is a diagram for explaining a Joule loss amount evaluation site;
【図４】交流磁場発生手段長手方向に沿った被加熱体表
面のジュール損失量分布図FIG. 4 is a diagram showing a Joule loss distribution on the surface of an object to be heated along a longitudinal direction of an AC magnetic field generating means.
【図５】被加熱体表面中央部のジュール損失量分布図FIG. 5 is a diagram showing a Joule loss distribution at a central portion of a surface of a heated object.
【図６】被加熱体表面端部近傍のジュール損失量分布図FIG. 6 is a distribution diagram of Joule loss in the vicinity of an end of a surface of a heated object.
【図７】本実施形態１の直流磁場発生手段の異なる磁化
方向を示す図FIG. 7 is a diagram showing different magnetization directions of the DC magnetic field generating means of the first embodiment.
【図８】本実施形態１の直流磁場発生手段の異なる磁化
方向を示す図FIG. 8 is a diagram showing different magnetization directions of the DC magnetic field generation means of the first embodiment.
【図９】本実施形態１の直流磁場発生手段の異なる磁化
方向を示す図FIG. 9 is a diagram showing different magnetization directions of the DC magnetic field generating means of the first embodiment.
【図１０】本発明の定着装置の本実施形態２を示す図FIG. 10 is a diagram showing a fixing device according to a second embodiment of the present invention;
【図１１】本発明の定着装置の本実施形態３を示す図FIG. 11 is a diagram illustrating a fixing device according to a third embodiment of the present invention.
【図１２】本実施形態２又は本実施形態３の交流磁場発
生手段長手方向に沿った被加熱体表面のジュール損失量
分布図FIG. 12 is a diagram showing the Joule loss distribution on the surface of the object to be heated along the longitudinal direction of the AC magnetic field generating means according to the second embodiment or the third embodiment.
【図１３】本実施形態２又は本実施形態３の被加熱体表
面中央部のジュール損失量分布図FIG. 13 is a diagram showing a Joule loss distribution at the center of the surface of the object to be heated according to the second or third embodiment.
【図１４】本実施形態２又は本実施形態３の被加熱体表
面端部近傍のジュール損失量分布図FIG. 14 is a diagram showing a Joule loss distribution in the vicinity of the end of the surface of the object to be heated according to the second or third embodiment.
【図１５】本実施形態１の直流磁場発生手段の残留磁束
密度を変えた場合の交流磁場発生手段長手方向に沿った
被加熱体表面のジュール損失量分布図FIG. 15 is a distribution diagram of Joule loss on the surface of the object to be heated along the longitudinal direction of the AC magnetic field generating means when the residual magnetic flux density of the DC magnetic field generating means of the first embodiment is changed.
【図１６】本実施形態１の直流磁場発生手段の厚みを変
えた場合の交流磁場発生手段長手方向に沿った被加熱体
表面のジュール損失量分布図FIG. 16 is a Joule loss distribution diagram of the surface of the object to be heated along the longitudinal direction of the AC magnetic field generating means when the thickness of the DC magnetic field generating means of the first embodiment is changed.
【図１７】本実施形態１の交流磁場発生手段の電流値を
変えた場合の交流磁場発生手段長手方向に沿った被加熱
体表面のジュール損失量分布図FIG. 17 is a Joule loss distribution diagram of the surface of the object to be heated along the longitudinal direction of the AC magnetic field generating means when the current value of the AC magnetic field generating means of the first embodiment is changed.
【図１８】本実施形態１の交流磁場発生手段の電流周波
数を変えた場合の交流磁場発生手段長手方向に沿った被
加熱体表面のジュール損失量分布図FIG. 18 is a Joule loss distribution diagram of the surface of the object to be heated along the longitudinal direction of the AC magnetic field generating means when the current frequency of the AC magnetic field generating means of the first embodiment is changed.
【図１９】本実施形態１の交流磁場発生手段の電流値と
周波数をともに変えた場合の交流磁場発生手段長手方向
に沿った被加熱体表面のジュール損失量分布図FIG. 19 is a Joule loss distribution diagram of the surface of the object to be heated along the longitudinal direction of the AC magnetic field generating means when the current value and the frequency of the AC magnetic field generating means of the first embodiment are both changed.
【図２０】直流磁場発生手段の残留磁束密度分布を示す
図FIG. 20 is a diagram showing a residual magnetic flux density distribution of the DC magnetic field generating means.
【図２１】直流磁場発生手段の異なる配置を示す図FIG. 21 is a diagram showing a different arrangement of DC magnetic field generating means.
【図２２】残留磁束密度に分布を与えた場合又は異なる
配置とした場合の交流磁場発生手段長手方向に沿った被
加熱体表面のジュール損失量分布図FIG. 22 is a diagram showing a Joule loss distribution on the surface of the object to be heated along the longitudinal direction of the AC magnetic field generation means when the distribution is given to the residual magnetic flux density or when the distribution is different.
【図２３】本発明の誘導加熱装置より構成された定着装
置の実施形態１を側面から見た断面図FIG. 23 is a cross-sectional view of Embodiment 1 of the fixing device including the induction heating device according to the present invention when viewed from the side.
【図２４】定着装置の実施形態１を端部から見た図FIG. 24 is a diagram of the fixing device according to the first exemplary embodiment viewed from an end.
【図２５】被加熱体表面のジュール損失量の評価部位を
示す図FIG. 25 is a diagram showing an evaluation site of a Joule loss amount on the surface of a heated object.
【図２６】従来例および定着装置の実施形態１におけ
る、交流磁場発生手段の中心部長手方向に沿った被加熱
体表面(D１−D２)のジュール損失量を示す図FIG. 26 is a diagram showing the Joule loss amount of the surface (D1-D2) of the object to be heated along the longitudinal direction of the center of the AC magnetic field generating means in the conventional example and the fixing device according to the first embodiment.
【図２７】従来例および定着装置の実施形態１におけ
る、交流磁場発生手段に覆われた幅領域の被加熱体表面
(E１−E２)のジュール損失量を示す図FIG. 27 shows the surface of the object to be heated in the width region covered with the AC magnetic field generating means in the conventional example and the fixing device according to the first embodiment.
The figure which shows the Joule loss amount of (E1-E2)
【図２８】従来例および定着装置の実施形態１におけ
る、交流磁場発生手段に覆われた長手方向の被加熱体表
面(F１−F２)のジュール損失量を示す図FIG. 28 is a diagram showing the Joule loss amount of the surface (F1-F2) of the object to be heated in the longitudinal direction covered by the AC magnetic field generating means in the conventional example and the fixing device according to the first embodiment.
【図２９】定着装置の実施形態２を示す図FIG. 29 is a diagram illustrating a fixing device according to a second embodiment.
【図３０】定着装置の実施形態３を示す図FIG. 30 is a diagram illustrating a fixing device according to a third embodiment.
【図３１】定着装置の実施形態４を示す図FIG. 31 is a diagram illustrating a fixing device according to a fourth embodiment.
【図３２】本発明の誘導加熱装置より構成された定着装
置の実施形態２を側面から見た断面図FIG. 32 is a cross-sectional view of Embodiment 2 of the fixing device including the induction heating device according to the present invention, as viewed from the side.
【図３３】定着装置の実施形態２における直流磁場発生
装置の構成を示す図FIG. 33 is a diagram illustrating a configuration of a DC magnetic field generation device according to a second embodiment of the fixing device.
【図３４】定着装置の実施形態２における永久磁石の着
磁状態を示す図FIG. 34 is a diagram illustrating a magnetized state of a permanent magnet according to a second embodiment of the fixing device.
【図３５】定着装置の実施形態２を交流磁場発生手段の
真上から見た概観図FIG. 35 is a schematic diagram of the fixing device according to the second embodiment, as viewed from directly above an AC magnetic field generating unit.
【図３６】従来例の各評価箇所での温度変化を示す図FIG. 36 is a diagram showing a temperature change at each evaluation point in the conventional example.
【図３７】定着装置の実施形態２の各評価箇所での温度
変化を示す図FIG. 37 is a diagram illustrating a temperature change at each evaluation point according to the second embodiment of the fixing device.
１ 被加熱体、 ２ 交流磁場発生手段 ３ 直流磁場発生手段 ４ 高残留磁束密度領域 ５ 低残留磁束密度領域 ６ 回転軸 ７ 定着ローラ ８ 軸受 ９ ベアリング DESCRIPTION OF SYMBOLS 1 Heated body, 2 AC magnetic field generation means 3 DC magnetic field generation means 4 High residual magnetic flux density area 5 Low residual magnetic flux density area 6 Rotating shaft 7 Fixing roller 8 Bearing 9 Bearing
Claims (9)
構成される誘導加熱装置において、直流磁場発生手段を
設け、前記直流磁場発生手段が形成する磁場を前記交流
磁場発生手段により変化させて前記被加熱体を加熱する
ことを特徴とする誘導加熱装置。1. An induction heating apparatus comprising a conductive object to be heated and an AC magnetic field generating means, wherein a DC magnetic field generating means is provided, and a magnetic field formed by the DC magnetic field generating means is changed by the AC magnetic field generating means. And heating the object to be heated.
記直流磁場発生手段から構成される誘導加熱装置におい
て、前記直流磁場発生手段が発生する直流磁場の磁束密
度が０．００１T以上である領域内に、前記交流磁場発
生手段を配置することを特徴とする誘導加熱装置。2. An induction heating apparatus comprising the object to be heated, the AC magnetic field generating means, and the DC magnetic field generating means, wherein the DC magnetic field generated by the DC magnetic field generating means has a magnetic flux density of 0.001 T or more. An induction heating apparatus, wherein the AC magnetic field generating means is arranged in a region.
ことを特徴とする請求項１記載又は請求項２記載の誘導
加熱装置。3. The induction heating apparatus according to claim 1, wherein said DC magnetic field generating means is a permanent magnet.
密度を有することを特徴とする請求項３記載の誘導加熱
装置。4. The induction heating apparatus according to claim 3, wherein said permanent magnets have partially different residual magnetic flux densities.
することを特徴とする請求項３記載の誘導加熱装置。5. The induction heating apparatus according to claim 3, wherein said permanent magnets have partially different thicknesses.
記被加熱体に対して交流磁界を与えて誘導加熱する交流
磁場発生手段を備えた定着装置において、請求項１から
請求項５のいずれかに記載の誘導加熱装置によって構成
された定着装置。6. A fixing device according to claim 1, further comprising: a fixing roller comprising a conductive object to be heated; and an AC magnetic field generating means for applying an AC magnetic field to said object to perform induction heating. A fixing device comprising the induction heating device according to any one of the above.
流磁場発生手段を前記定着ローラの両端部に配置するこ
とを特徴とする定着装置。7. The fixing device according to claim 6, wherein said DC magnetic field generating means is disposed at both ends of said fixing roller.
生手段が、前記定着ローラの回転とは無関係に自由に回
転できることを特徴とする定着装置。8. A fixing device according to claim 7, wherein said DC magnetic field generating means of said fixing device can rotate freely irrespective of rotation of said fixing roller.
おいて、前記直流磁場発生手段とする永久磁石が、前記
定着ローラの回転軸を中心としてラジアル方向に着磁さ
れていることを特徴とする定着装置。9. The fixing device according to claim 7, wherein the permanent magnet serving as the DC magnetic field generating means is magnetized in a radial direction about a rotation axis of the fixing roller. Fixing device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002059585A JP2002343541A (en) | 2001-03-13 | 2002-03-05 | Induction heating device |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001-70375 | 2001-03-13 | ||
| JP2001070375 | 2001-03-13 | ||
| JP2002059585A JP2002343541A (en) | 2001-03-13 | 2002-03-05 | Induction heating device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002343541A true JP2002343541A (en) | 2002-11-29 |
| JP2002343541A5 JP2002343541A5 (en) | 2005-04-21 |
Family
ID=26611147
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002059585A Withdrawn JP2002343541A (en) | 2001-03-13 | 2002-03-05 | Induction heating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002343541A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012074358A (en) * | 2010-09-27 | 2012-04-12 | Chung Yuan Christian Univ | Induction heating apparatus and method for controlling the same |
| US8389911B2 (en) | 2007-10-09 | 2013-03-05 | Tsugumitsu Matsui | Electromagnetic induction type heating device, hot air generating device and electrical power generating device |
| CN103442470A (en) * | 2013-09-05 | 2013-12-11 | 哈尔滨理工大学 | Electromagnetic heating device and heating method for electromagnetic heating device |
| JP2017221061A (en) * | 2016-06-09 | 2017-12-14 | 本田技研工業株式会社 | Housing temperature raising device |
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| JPS5933785A (en) * | 1982-08-19 | 1984-02-23 | 松下電器産業株式会社 | High frequency induction heating roller |
| JPS6486474A (en) * | 1987-09-29 | 1989-03-31 | Sumitomo Heavy Industries | Induction heating device |
| JPH0582248A (en) * | 1991-08-08 | 1993-04-02 | Berumateitsuku:Kk | Induction heating method and induction heater |
| JPH10153922A (en) * | 1996-09-30 | 1998-06-09 | Masahiro Tategami | Heat roller device |
| JPH1197163A (en) * | 1997-09-24 | 1999-04-09 | Mitsubishi Heavy Ind Ltd | Device for maintaining gap for positioning high frequency heating coil |
| JPH11203633A (en) * | 1998-01-05 | 1999-07-30 | Alps Electric Co Ltd | Magnetic head |
| JP2000150131A (en) * | 1998-11-16 | 2000-05-30 | Walzen Irle Gmbh | Induction heating apparatus for heating roll |
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2002
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5933785A (en) * | 1982-08-19 | 1984-02-23 | 松下電器産業株式会社 | High frequency induction heating roller |
| JPS6486474A (en) * | 1987-09-29 | 1989-03-31 | Sumitomo Heavy Industries | Induction heating device |
| JPH0582248A (en) * | 1991-08-08 | 1993-04-02 | Berumateitsuku:Kk | Induction heating method and induction heater |
| JPH10153922A (en) * | 1996-09-30 | 1998-06-09 | Masahiro Tategami | Heat roller device |
| JPH1197163A (en) * | 1997-09-24 | 1999-04-09 | Mitsubishi Heavy Ind Ltd | Device for maintaining gap for positioning high frequency heating coil |
| JPH11203633A (en) * | 1998-01-05 | 1999-07-30 | Alps Electric Co Ltd | Magnetic head |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8389911B2 (en) | 2007-10-09 | 2013-03-05 | Tsugumitsu Matsui | Electromagnetic induction type heating device, hot air generating device and electrical power generating device |
| JP2012074358A (en) * | 2010-09-27 | 2012-04-12 | Chung Yuan Christian Univ | Induction heating apparatus and method for controlling the same |
| CN103442470A (en) * | 2013-09-05 | 2013-12-11 | 哈尔滨理工大学 | Electromagnetic heating device and heating method for electromagnetic heating device |
| JP2017221061A (en) * | 2016-06-09 | 2017-12-14 | 本田技研工業株式会社 | Housing temperature raising device |
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