An inner-rotor motor for preventing the formation of an electrical conducting path between an iron core and a housing of the motor includes a stator and a rotor. The stator includes the housing, an insulating layer and the iron core. The insulating layer is arranged between the housing and the iron
An inner-rotor motor for preventing the formation of an electrical conducting path between an iron core and a housing of the motor includes a stator and a rotor. The stator includes the housing, an insulating layer and the iron core. The insulating layer is arranged between the housing and the iron core and prevents the electrical conducting path from forming between the housing and the iron core. The rotor includes a shaft rotatably coupled with the housing, and a permanent magnet unit is arranged around the shaft.
대표청구항▼
1. An inner-rotor motor comprising: a stator comprising a housing, an insulating layer and an iron core, wherein the housing includes two ends spaced from each other in an axial direction, wherein the insulating layer is arranged between the housing and the iron core in a radial direction perpendicu
1. An inner-rotor motor comprising: a stator comprising a housing, an insulating layer and an iron core, wherein the housing includes two ends spaced from each other in an axial direction, wherein the insulating layer is arranged between the housing and the iron core in a radial direction perpendicular to the axial direction and prevents an electrical conducting path from forming between the housing and the iron core, wherein a coil is arranged on the iron core; anda rotor comprising a shaft rotatably coupled with the housing, with a permanent magnet unit arranged around the shaft,wherein the insulating layer further comprises a bobbin formed on an outer periphery of the iron core, wherein the bobbin is located between the two ends of the housing in the axial direction, wherein the iron core is located between the insulating layer and the permanent magnet in the radial direction perpendicular to the axial direction, and wherein the bobbin is wound with the coil. 2. The inner-rotor motor as claimed in claim 1, wherein the insulating layer comprises an insulating member made of an insulating material, wherein the insulating member is coupled to an inner surface of the housing, and wherein the iron core couples with an inner periphery of the insulating member to arrange the insulating layer between the housing and the iron core. 3. The inner-rotor motor as claimed in claim 2, wherein the inner periphery of the insulating member defines a through hole and a coupling surface, wherein the iron core couples with the coupling surface, and wherein the insulating member is radially arranged between the inner surface of the housing and the iron core to separate the iron core and the housing from each other in the radial direction. 4. The inner-rotor motor as claimed in claim 2, wherein the insulating member is press fit to the inner surface of the housing. 5. The inner-rotor motor as claimed in claim 2, wherein the insulating member is formed on the inner surface of the housing by injection molding. 6. The inner-rotor motor as claimed in claim 2, wherein the insulating member is adhered to the inner surface of the housing. 7. The inner-rotor motor as claimed in claim 1, wherein the insulating layer comprises an air layer and at least one connecting portion having two ends respectively coupled with the housing and the iron core, and wherein the connecting portion extends in a radial direction of the shaft and forms the air layer between the housing and the iron core. 8. The inner-rotor motor as claimed in claim 7, wherein the insulating layer further comprises an insulating member coupled with the housing, wherein the at least one connecting portion comprises two connecting portions, wherein the insulating member comprises two ends each being coupled with one of the two connecting portions, and wherein each of the two connecting portions comprises two ends respectively coupled with the insulating member and the iron core and extends in the radial direction of the shaft to form the air layer between the insulating member and the iron core. 9. The inner-rotor motor as claimed in claim 7, wherein the insulating layer further comprises an insulating member coupled with the iron core, wherein the at least one connecting portion comprises two connecting portions, wherein the insulating member comprises two ends each being coupled with one of the two connecting portions, and wherein each of the two connecting portions comprises two ends respectively coupled with the insulating member and the housing and extends in the radial direction of the shaft to form the air layer between the insulating member and the housing. 10. The inner-rotor motor as claimed in claim 1, wherein the housing comprises a receiving portion configured to receive the bearing, and wherein the shaft extends through the bearing. 11. The inner-rotor motor as claimed in claim 10, wherein the receiving portion comprises an opening located at an end of the shaft, wherein a cover plate is coupled with the housing, and wherein the cover plate covers the opening of the receiving portion. 12. The inner-rotor motor as claimed in claim 1, wherein the housing comprises a first coupling portion, and wherein the insulating layer comprises a second coupling portion coupled with the first coupling portion to couple the insulating layer with an inner surface of the housing. 13. The inner-rotor motor as claimed in claim 12, wherein the first coupling portion is a shoulder on the inner surface of the housing, and wherein the second coupling portion is an abutting surface abutting with the first coupling portion. 14. The inner-rotor motor as claimed in claim 1, wherein the insulating layer further comprises two extending portions on two ends of the insulating layer, and wherein each of the two extending portions extends from the insulating layer to the housing in the axial direction and abuts with the housing. 15. The inner-rotor motor as claimed in claim 1, wherein the bobbin is integrally formed on the outer periphery of the iron core. 16. The inner-rotor motor as claimed in claim 15, the bobbin is integrally formed with the insulating layer. 17. The inner-rotor motor as claimed in claim 1, wherein the bobbin comprises a top bobbin and a bottom bobbin. 18. The inner-rotor motor as claimed in claim 17, wherein each of the top bobbin and the bottom bobbin is integrally formed with the insulating layer.
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이 특허에 인용된 특허 (4)
Kojima, Tomonori; Itagaki, Atsushi; Murakami, Masanori; Tanabe, Yoichi; Tanno, Toshiaki; Matsuzaki, Hirokazu; Yamada, Masaki, Axial air gap type electric motor.
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