JPH09252557A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a motor whose reliability is enhanced and whose cost is reduced, by a method wherein a protruding part is molded integrally on the bottom face of an insulator and a recessed part which is faced with the protruding part is formed on a side on which the insulator with the protruding part formed at a core is inserted. SOLUTION: A protruding part 2a is molded integrally on the bottom face of an insulator 2, on one side, which matches the inside of a slot from both ends of a core 1, and a recessed part 1a which is faced with the protruding part 2a is formed on the edge of a core 1 on a side on which the insulator 2 with the protruding part 2a formed is inserted. Consequently, since insulators 2 in which the shape oh their bottom face is different are inserted into the cores 1 in which the shape of both edges is different, the direction of the stamping burr at every core 1 can be decided unconditionally. Thus, when a motor is assembled, the direction of the stamping burr at every core can be discriminated simply, the direction can be discriminated by a sensor, and it is possible to prevent a defect from being generated due to the mistake of an assembling direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises an iron core having a plurality of slots, a butt insulator for electrically insulating the iron core, and a winding wire provided in the slot of the iron core through the insulator. A stator having, a permanent magnet rotor arranged to face a magnetic pole surface of the stator, a bearing for rotatably holding the rotor, a housing for holding the bearing on the stator, the fixed The present invention relates to an electric motor having a circuit board held by a child.

[0002]

2. Description of the Related Art In recent years, there has been a strong demand for higher reliability and lower cost of electric motors used in home appliances and air conditioners.

A conventional electric motor will be described below. FIG. 6 is 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,
Reference numeral 7 is a terminal, and 8 is a printed wiring board.

A conventional electric motor is provided with an insulator 9 that abuts in a slot of the iron core 1 and a stator composed of a winding 3, and the insulator 9 is provided with a terminal 7 in which the tip of the winding 3 is entwined.
It is fixed to the printed wiring board 8 by soldering, and the inner peripheral surface of the iron core 1 is press-fitted and fixed to the outer peripheral surface of the housing 6.

[0005]

However, in the above-mentioned conventional structure, when the iron core 1 is press-fitted, the punching burr of the iron core 1 scrapes off the surface of the housing 6 made of a relatively soft material. In order to minimize the amount of the cutting powder, the direction in which the iron core 1 is press-fitted into the housing 6 must be restricted from the side opposite to the burr side, but the insulator 9 is abutted in the slot of the iron core 1 to form the winding 3. There is a problem that it is difficult to determine the burr side of the iron core 1 in the state of the stator provided, and the chips are accumulated on the printed wiring board 8 and cause a defect due to a short circuit. .

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide an electric motor having high reliability and relatively low cost.

[0007]

In order to solve this problem, the electric motor according to claim 1 of the present invention is such that a convex portion is integrally formed on one bottom surface of an insulator which is abutted from both ends of an iron core in a slot, and is convex. It has a configuration in which a concave portion facing the convex portion is provided on the end surface of the iron core on the side where the insulator provided with the portion is inserted.

An outer rotor type electric motor according to a second aspect of the present invention has a structure in which the bottom surface side of the inner peripheral surface of the insulator is stepped in the outer radial direction.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention comprises an iron core having a plurality of slots, a butt insulator for electrically insulating the iron core, and the insulator in the slot of the iron core. A stator having a winding wound through it, a permanent magnet rotor arranged to face the magnetic pole surface of the stator, and a bearing for rotatably holding the rotor,
In a motor having a housing for holding the bearing on the stator and a circuit board held on the stator, a convex portion is integrally formed on the bottom surface of the insulator, and the convex portion of the iron core is provided. It has a recess facing each other on the side where the insulator is inserted.Since butt insulators with different bottom shapes are inserted into iron cores with different end surfaces, the direction of the punch burr of the iron core is unique. Can be decided. Therefore, when assembling the electric motor, the direction of the punching burr of the iron core can be easily identified, the direction can be identified by the sensor, and the occurrence of defects due to the wrong assembly direction can be prevented.

According to a second aspect of the present invention, an iron core having a plurality of slots, a butt insulator that electrically insulates the iron core, and a winding wire provided in the slot of the iron core via the insulator. A stator having, a permanent magnet rotor arranged to face a magnetic pole surface of the stator, a bearing that rotatably holds the rotor, and a housing that holds the bearing on the stator, In an electric motor having a rotating substrate held by the stator, the bottom surface side of the inner peripheral surface of the insulator is stepped in the outer radial direction,
A cutting powder reservoir can be provided between the stepped portion of the inner peripheral surface of the insulator and the housing into which the iron core is press-fitted, and the cutting powder is not discharged to the outside.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment 1) 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 how to combine the iron core and the insulator in FIG.
FIG. 3 is a sectional view of FIG.

FIG. 4 is a sectional view showing a state in which the iron core shown in FIG. 1 and a stator formed of an insulating material and a winding butted in the slot of the iron core are press-fitted into the housing.

FIG. 5 is an explanatory view showing the movement of the cutting chips during the press-fitting. In FIG. 1, 1 is an iron core, 2 is a butt insulator, 3 is a winding wire, 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. Reference numeral 1a is a concave portion, 1b is a punching burr, 2a is a convex portion, 2b is a stepped portion, and 2c in FIG. 2 is a chip collecting portion.

Further, in FIG. 5, reference numeral 6a is a chip of the housing. When the insulator 2 is inserted into the slot of the iron core 1 so as to abut against each other, the protrusion 2a integrally formed on the bottom surface of the insulator 2 and the recess 1a provided on the end face of the iron core 1 allow the punching burr of the iron core 1 to be formed. The direction of 1b is uniquely determined.

Further, a portion 2b in which the bottom surface side of the inner peripheral surface of the insulator 2 is stepped in the outer diameter direction and the housing 6 constitute a swarf collecting portion 2c for confining the swarf 6a generated during press fitting. You can

The present invention is not limited to the above embodiment.

[0017]

As described above, according to the present invention, it is possible to easily identify the direction of the punching burr of the iron core, prevent a defect such as a wrong assembly, and prevent the cutting chips from being discharged to the outside when the iron core is press-fitted. The structure for ensuring the high reliability can be realized by devising the shape of the insulator, and the electric motor having a relatively low cost can be realized.

[Brief description of 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 how to combine an iron core and an insulator in FIG.

FIG. 3 is a sectional view of FIG.

FIG. 4 is a sectional view showing a state in which a housing is press-fitted into the stator shown in FIG.

FIG. 5 is an explanatory diagram showing movement of chips during press-fitting of the iron core.

FIG. 6 is a half sectional view of a conventional electric motor

[Explanation of symbols]

1 Iron core 1a Iron core recess 1b Iron core punching burr 2 Insulator 2a Convex part integrally molded on the insulator 2b Inner peripheral surface bottom surface stepped portion in the outer diameter direction 2c Chip collecting part 3 Winding 4 Permanent magnet rotor 5 Bearing 6 Housing 6a Housing chips 7 Terminal 8 Printed wiring board 9 Insulator

Claims (2)

[Claims] 1. A stator having an iron core having a plurality of slots, a butt insulator for electrically insulating the iron core, and a winding wire provided in 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; and a housing for holding the bearing on the stator.
In a motor having a circuit board held by the stator, a convex portion is integrally molded on the bottom surface of the insulator, and a concave portion facing the side on which the insulator provided with the convex portion of the iron core is inserted. An electric motor having the configuration provided. 2. A stator having an iron core having a plurality of slots, a butt insulator that electrically insulates the iron core, and a winding wire provided in the slots 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 bearing held on the stator. An outer rotor type electric motor having a circuit board, wherein the bottom surface side of the inner peripheral surface of the insulator is stepped in the outer radial direction.