JP3642098B2 - Electric motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a stator having an iron core having a plurality of slots, a butt insulator that electrically insulates the iron core, and a winding wound on the slot of the iron core via the insulator, and the fixing A permanent magnet rotor disposed opposite to the magnetic pole surface of the child, a bearing for rotatably holding the rotor, a housing for holding the bearing on the stator, and a circuit board held by the stator bet on an electric motor equipped with.
[0002]
[Prior art]
In recent years, there has been a strong demand for high reliability and low cost for electric motors used in home appliances and air conditioners.
[0003]
A conventional electric motor will be described below.
FIG. 6 shows a half sectional view of a conventional electric motor. In FIG. 6, 1 is an iron core, 9 is a butt insulator, 3 is a winding, 4 is a permanent magnet rotor, 5 is a bearing, 6 is a housing, 7 is a terminal, and 8 is a printed wiring board.
[0004]
In the conventional motor, an insulator 9 that is abutted in the slot of the iron core 1 and a stator composed of the winding 3 are provided on the insulator 9, and the printed wiring board 8 is soldered to the terminal 7 with the tip of the winding 3 entangled. The inner peripheral surface of the iron core 1 is press-fitted and fixed to the outer peripheral surface of the housing 6.
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional configuration, when the iron core 1 is press-fitted, the surface of the housing 6 made of a material whose punching burrs of the iron core 1 are relatively soft is scraped off. In order to minimize the amount of the chips, the direction in which the iron core 1 is press-fitted into the housing 6 must be regulated from the opposite burr side, but the insulator 9 is abutted in the slot of the iron core 1 and the winding 3 is connected. In the state of the applied stator, there is a problem that it is difficult to determine the burr side of the iron core 1, and there is a problem that the chips accumulate on the printed wiring board 8 and cause a defect due to a short circuit. .
[0006]
The present invention solves the above-described conventional problems, and an object thereof is to provide an electric motor that is highly reliable and relatively low in cost.
[0007]
[Means for Solving the Problems]
This onset bright in order to solve this problem, from both ends of the core are integrally molded projections on one of the bottom surface of the insulator abut in the slot, and the side of inserting the convex portion is provided with insulator core of It has the structure which provided the recessed part facing the convex part in the end surface.
[0008]
And the electric motor of this invention has the structure which made the bottom face side of the inner peripheral surface of an insulator stepped shape in the outer-diameter direction.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The present invention provides a stator having an iron core having a plurality of slots, a butt insulator that electrically insulates the iron core, and a winding wound on the slot of the iron core via the insulator, A permanent magnet rotor arranged to face the magnetic pole surface of the stator, a bearing for rotatably holding the rotor, a housing for holding the bearing on the stator, and a circuit held by the stator In an electric motor having a substrate, a convex portion is integrally formed on the bottom surface of the insulator, and a concave portion is provided opposite to the side on which the insulator provided with the convex portion of the iron core is inserted. Since the insulators having different shapes are inserted into the iron cores having different end face shapes, the direction of the punching burrs of the iron core can be uniquely determined. Therefore, when assembling the electric motor, it is possible to easily identify the direction of the punching burr of the iron core, and it is possible to identify the direction by the sensor, and it is possible to prevent the occurrence of a defect due to the wrong installation direction.
[0010]
And, the present invention provides a stator having an iron core having a plurality of slots, a butted insulator for electrically insulating the iron core, and a winding wound on the slot of the iron core via the insulator. A permanent magnet rotor arranged to face the magnetic pole surface of the stator, a bearing for rotatably holding the rotor, a housing for holding the bearing on the stator, and a stator. In the electric motor provided with the rotating substrate, the bottom surface side of the inner peripheral surface of the insulator is stepped in the outer diameter direction, and the stepped portion of the inner peripheral surface of the insulator and the iron core are press-fitted. A swarf reservoir can be provided between the housing and the housing so that the swarf is not discharged to the outside.
[0011]
Hereinafter, embodiments of the present invention will be described with reference to FIGS.
(Embodiment 1)
FIG. 1 is a half sectional view of an electric motor according to an embodiment of the present invention. 2 is a perspective view showing a combination of the iron core and the insulator in FIG. 1, and FIG. 3 is a cross-sectional view of FIG.
[0012]
FIG. 4 is a cross-sectional view showing a state in which the stator formed of the iron core and the insulator to be abutted in the slot of the iron core and the winding in FIG.
[0013]
Moreover, FIG. 5 is explanatory drawing which shows the motion of the chip in the middle of press injection.
In FIG. 1, 1 is an iron core, 2 is a butt insulator, 3 is a winding, 4 is a permanent magnet rotor, 5 is a bearing, 6 is a housing, 7 is a terminal, and 8 is a printed wiring board. 1a is a concave portion, 1b is a punching burr, 2a is a convex portion, 2b is a stepped portion, and in FIG.
[0014]
In FIG. 5, reference numeral 6a denotes housing dust. When the insulator 2 is inserted so as to abut in the slot of the iron core 1, a punching burr of the iron core 1 is formed by the convex portion 2 a integrally formed on the bottom surface of the insulator 2 and the concave portion 1 a provided on the end surface of the iron core 1. The direction of 1b is uniquely determined.
[0015]
Further, the portion 2b having the inner peripheral surface of the insulator 2 having a stepped portion 2b in the outer diameter direction and the housing 6 constitute a swarf accumulating portion 2c, which can confine the swarf 6a generated during press-fitting.
[0016]
The present invention is not limited to the embodiment described above.
[0017]
【The invention's effect】
As described above, the present invention makes it possible to easily identify the direction of the punching burr of the iron core, to prevent defects such as wrong assembly, and to ensure high reliability that the chips during the iron core press-in operation are not discharged to the outside. Therefore, the electric motor with relatively low cost can be realized by devising the shape of the insulator.
[Brief description of the drawings]
FIG. 1 is a half sectional view of an electric motor according to an embodiment of the present invention. FIG. 2 is a perspective view showing a combination of an iron core and an insulator in FIG. 1. FIG. 3 is a sectional view in FIG. FIG. 5 is an explanatory view showing the movement of chips during the press-fitting of an iron core. FIG. 6 is a half cross-sectional view of a conventional electric motor.
DESCRIPTION OF SYMBOLS 1 Iron core 1a Iron core recessed part 1b Iron core punching burr 2 Insulator 2a Convex part integrally formed with the insulator 2b The part where the bottom surface side of the inner peripheral surface of the insulator is stepped in the outer diameter direction 2c Chip accumulation part 3 Winding 4 Permanent magnet rotor 5 Bearing 6 Housing 6a Housing chips 7 Terminal 8 Printed wiring board 9 Insulator

Claims (1)

A stator having a plurality of slots, a butt insulator that electrically insulates the core, and a winding wound on the slots of the iron core via the insulator; and a magnetic pole surface of the stator A permanent magnet rotor disposed opposite to the rotor, a bearing for rotatably holding the rotor, a housing for holding the bearing on the stator, and a circuit board held on the stator. In the electric motor, when the iron core is press-fitted into the housing, the direction in which the iron core is press-fitted into the housing is controlled in order to suppress the amount of chips generated by the punching burr of the iron core scraping off the surface of the housing. anti burr side integrally molded projections on the bottom surface of the insulator so as to regulate from, and provided opposing recess on the side of inserting the insulator provided with the convex portion of the core structure It has a further outer rotor type motor having a bottom surface side of the inner peripheral surface of the insulator and the outer diameter direction and stepped shape configured for reservoir of the cut powder.

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