Abstract
Litz wire is widely utilized for heating coils of the induction cookers to suppress the proximity effect. However, low space factor of the Litz wire often significantly increases the heating coil height, which may be an obstacle of wide-spread of the induction cookers. In order to overcome this problem, a preceding study has proposed a heating coil structure of the copper foil, which suppresses the proximity effect without using the Litz wire. The preceding study has proven effective suppression of the proximity effect, when the material to be heated is placed to cover the heating coil. However, this heating coil structure still suffers from large A C resistance, when the material to be heated does not exist or partially covers the heating coil. Furthermore, the ferrite walls, installed to suppress the proximity effect, need larger height than the coil, hindering effective reduction of the total heating coil height. The purpose of this paper is to propose an improved heating coil structure. The proposed heating coil structure further incorporates a thin layer of low-permeability soft-magnetic material covering the top of the coil. This layer enables elimination of the proximity effect regardless of the existence or the disposition of the material to be heated. Furthermore, this layer enables the ferrite walls to have the same height as the coil, thus further reducing the total heating coil height. The F E M based simulation was carried out to verify the operating principle of this structure. The result supported reduction of the heating coil height and effective suppression of the A C resistance regardless of the existence and the disposition of the material to be heated.
| Original language | English |
|---|---|
| Title of host publication | Proceedings |
| Subtitle of host publication | IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society |
| Publisher | Institute of Electrical and Electronics Engineers Inc. |
| Pages | 3503-3508 |
| Number of pages | 6 |
| ISBN (Electronic) | 9781509066841 |
| DOIs | |
| Publication status | Published - Dec 26 2018 |
| Event | 44th Annual Conference of the IEEE Industrial Electronics Society, IECON 2018 - Washington, United States Duration: Oct 20 2018 → Oct 23 2018 |
Publication series
| Name | Proceedings: IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society |
|---|
Conference
| Conference | 44th Annual Conference of the IEEE Industrial Electronics Society, IECON 2018 |
|---|---|
| Country | United States |
| City | Washington |
| Period | 10/20/18 → 10/23/18 |
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Keywords
- AC resistance
- Copper loss
- Induction heating
- Proximity effect
- Skin effect
ASJC Scopus subject areas
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering
- Industrial and Manufacturing Engineering
- Control and Optimization
Cite this
Improved thin heating coil structure of copper foil feasible for induction cookers. / Umetani, Kazuhiro; Mishima, Tomohiro; Hiraki, Eiji; Hirokawa, Takayuki; Imai, Makoto; Sadakata, Hideki.
Proceedings: IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society. Institute of Electrical and Electronics Engineers Inc., 2018. p. 3503-3508 8591462 (Proceedings: IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society).Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Improved thin heating coil structure of copper foil feasible for induction cookers
AU - Umetani, Kazuhiro
AU - Mishima, Tomohiro
AU - Hiraki, Eiji
AU - Hirokawa, Takayuki
AU - Imai, Makoto
AU - Sadakata, Hideki
PY - 2018/12/26
Y1 - 2018/12/26
N2 - Litz wire is widely utilized for heating coils of the induction cookers to suppress the proximity effect. However, low space factor of the Litz wire often significantly increases the heating coil height, which may be an obstacle of wide-spread of the induction cookers. In order to overcome this problem, a preceding study has proposed a heating coil structure of the copper foil, which suppresses the proximity effect without using the Litz wire. The preceding study has proven effective suppression of the proximity effect, when the material to be heated is placed to cover the heating coil. However, this heating coil structure still suffers from large A C resistance, when the material to be heated does not exist or partially covers the heating coil. Furthermore, the ferrite walls, installed to suppress the proximity effect, need larger height than the coil, hindering effective reduction of the total heating coil height. The purpose of this paper is to propose an improved heating coil structure. The proposed heating coil structure further incorporates a thin layer of low-permeability soft-magnetic material covering the top of the coil. This layer enables elimination of the proximity effect regardless of the existence or the disposition of the material to be heated. Furthermore, this layer enables the ferrite walls to have the same height as the coil, thus further reducing the total heating coil height. The F E M based simulation was carried out to verify the operating principle of this structure. The result supported reduction of the heating coil height and effective suppression of the A C resistance regardless of the existence and the disposition of the material to be heated.
AB - Litz wire is widely utilized for heating coils of the induction cookers to suppress the proximity effect. However, low space factor of the Litz wire often significantly increases the heating coil height, which may be an obstacle of wide-spread of the induction cookers. In order to overcome this problem, a preceding study has proposed a heating coil structure of the copper foil, which suppresses the proximity effect without using the Litz wire. The preceding study has proven effective suppression of the proximity effect, when the material to be heated is placed to cover the heating coil. However, this heating coil structure still suffers from large A C resistance, when the material to be heated does not exist or partially covers the heating coil. Furthermore, the ferrite walls, installed to suppress the proximity effect, need larger height than the coil, hindering effective reduction of the total heating coil height. The purpose of this paper is to propose an improved heating coil structure. The proposed heating coil structure further incorporates a thin layer of low-permeability soft-magnetic material covering the top of the coil. This layer enables elimination of the proximity effect regardless of the existence or the disposition of the material to be heated. Furthermore, this layer enables the ferrite walls to have the same height as the coil, thus further reducing the total heating coil height. The F E M based simulation was carried out to verify the operating principle of this structure. The result supported reduction of the heating coil height and effective suppression of the A C resistance regardless of the existence and the disposition of the material to be heated.
KW - AC resistance
KW - Copper loss
KW - Induction heating
KW - Proximity effect
KW - Skin effect
UR - http://www.scopus.com/inward/record.url?scp=85061522910&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85061522910&partnerID=8YFLogxK
U2 - 10.1109/IECON.2018.8591462
DO - 10.1109/IECON.2018.8591462
M3 - Conference contribution
T3 - Proceedings: IECON 2018 - 44th Annual Conference of the IEEE Industrial Electronics Society
SP - 3503
EP - 3508
BT - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
ER -