JPH01123458U

JPH01123458U -

Info

Publication number: JPH01123458U
Application number: JP1943988U
Authority: JP
Priority date: 1988-02-17
Filing date: 1988-02-17
Publication date: 1989-08-22

Description

[Brief explanation of the drawing]

第１図は本考案の実施例の構成を示す半部断面
図、第２図は第１図の要部の拡大図、第３図は同
実施例で用いるロータ鉄心の側面図、第４図は従
来の電動送風機及び本考案の電動送風機において
ロータに働く磁気吸引力と磁気中心位置のずれ量
との関係を示す線図、第５図は従来の電動送風機
の構成を示す半部断面図である。１……フアンケース、２……軸受メタル、３…
…回転軸、４……ロータ、４０２……ロータ鉄心
、５……ステータ、５０１……ステータ鉄心、６
……軸流フアン、Ｃ……ロータ鉄心とステータ鉄
心との間の空隙を変更しない部分、Ｄ……ロータ
鉄心とステータ鉄心との間の空隙を大きくする部
分。 Fig. 1 is a half-sectional view showing the configuration of an embodiment of the present invention, Fig. 2 is an enlarged view of the main part of Fig. 1, Fig. 3 is a side view of the rotor core used in the embodiment, and Fig. 4. 5 is a diagram showing the relationship between the magnetic attraction force acting on the rotor and the amount of deviation of the magnetic center position in a conventional electric blower and the electric blower of the present invention, and FIG. 5 is a half sectional view showing the configuration of the conventional electric blower. be. 1...Fan case, 2...Bearing metal, 3...
... Rotating shaft, 4 ... Rotor, 402 ... Rotor core, 5 ... Stator, 501 ... Stator core, 6
...Axis fan, C...A portion that does not change the gap between the rotor core and stator core, D...A portion that increases the gap between the rotor core and stator core.

Claims

[Claim for Utility Model Registration] Consists of a stator consisting of a stator core with an armature coil wound around it, and a rotor equipped with a rotor core provided with a cage-shaped conductor and mounted on a rotating shaft supported by a bearing metal. an electric motor and an axial blower fan attached to the rotor, the magnetic center of the stator core and the magnetic center of the rotor core are arranged so as to generate a magnetic attraction force that biases the rotor toward one side in the axial direction. In an electric blower in which the rotor core and the stator core are offset in the axial direction, a gap between a portion of the rotor core near the end facing in a direction opposite to the magnetic attraction force and the stator core is different from other portions of the rotor core. An electric blower characterized in that the air gap is set larger than the gap between the stator core and the stator core.