JP3697796B2 - Electric motor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is related to an electric motor used for an electric vacuum cleaner and the like.
[0002]
[Prior art]
In recent years, electric devices are required to have high efficiency and high output . For this reason, electric motors used in electric devices are also required to be small, light, and highly efficient. In addition, automatic assembly has further progressed, and electric motors are required to reduce the number of parts for automatic assembly.
[0003]
A conventional electric motor for a vacuum cleaner will be described below. FIG. 4 is a half sectional view of a conventional electric motor. In FIG. 4, 1 is a cylindrical motor frame having a bearing support 3 at the center and a brush holder 17 at the periphery thereof, and 18 is a bracket having a bearing support 8 at the center. A stator 10 having a pair of windings 12 and a rotor 14 having a rotating shaft 15 supported by a bearing 19 attached to the bearing support 3 are housed between the cylindrical motor frame 1 and the bracket 18. ing.
[0004]
In this electric motor, the laminated iron core of the stator 10 is press-fitted into the cylindrical inner diameter of the cylindrical motor frame, and the cylindrical motor frame 1 is deformed by punching from the outer peripheral surface of the cylindrical motor frame 1 so that the iron core of the stator 10 is deformed. The end face is fixed with pressure.
[0005]
[Problems to be solved by the invention]
However, the above conventional configuration requires a punching process for fixing the stator iron core, and the cylinder portion of the cylindrical motor frame needs to be larger than the stator core lamination dimension. If the connection with the outer peripheral annular portion of the frame is made into a smooth shape with a large radius of curvature, there is a problem that the entire length of the cylindrical motor frame becomes long and hinders the reduction in size and weight of the electric motor. Accordingly, an object of the present invention is to provide an electric motor that can reduce the number of man-hours for assembling the electric motor, can reduce the loss of the flow of the wind inside the electric motor when used as a blower, and can be reduced in size and weight.
[0006]
[Means for Solving the Problems]
In order to solve this problem, the present invention provides a cylindrical motor frame having an outer peripheral annular portion on the opening side, a stator having a laminated iron core partially covered with a synthetic resin, and a winding, and the stator and the oppositely disposed armature, a centrifugal fan attached to the distal end of the rotating shaft of the armature, Oite more comprising motor and metal bracket having a pressure arm that can be small variations, the metal bracket The synthetic resin part of the stator is clamped by the pressure arm at the same time as fixing to the outer peripheral annular part of the cylindrical motor frame , and the metal bracket has an outer peripheral flat part. A plurality of fixing holes are provided, further comprising a belt-like frame having a bearing support portion of the rotating shaft between the fixing holes of the outer peripheral plane portion, and the outer peripheral plane portion in the vicinity of the fixing hole. Before Ru motor der having the structure pressure arm is provided in the direction toward the stator side.
[0007]
According to the present invention, the fixing of the stator is ensured only by screwing and fixing the bracket to the cylindrical motor frame, and simultaneously the pressing arm of the bracket presses the end face of the stator. The conventional punch fixing process and screw fixing process for fixing the stator can be reduced, and automatic assembly can be facilitated .
[0008]
In the present invention, when the connection between the cylindrical portion and the outer peripheral annular portion of the motor frame is configured in a smooth shape with a large curvature radius, the internal flow of the wind motor can be reduced without increasing the overall length of the cylindrical motor frame when used as a blower. Loss can be reduced and a highly efficient electric motor can be provided.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0010]
FIG. 1 is a half sectional view of the electric motor of the present invention, and FIGS. 2 to 3 are a plan view and a side view of the bracket of the present invention. 1 to 3, reference numeral 1 denotes a resin-made cylindrical motor frame having an outer peripheral annular portion 2 on the opening side and a bearing support portion 3 in the center on the closing portion side, and 4 denotes a cylindrical shape on the outer peripheral plane portion 5. The bracket has a fixing hole 6 for the motor frame 1, a pressing arm 7 for fixing the stator 10, and a bearing support portion 8 in the center. A stator 10 is fixed between the cylindrical motor frame 1 and the bracket 4. The stator 12 is covered with a synthetic resin 11 while covering a part of the surface of the stator laminated iron core with a winding 12. A cradle 13 is provided in the synthetic resin portion. Reference numeral 14 denotes an armature which is disposed inside the stator 10 and is held by the cylindrical motor frame 1 and the bearing support portion of the bracket 4. The armature 14 includes a centrifugal fan 16 attached to the tip of the rotating shaft 15.
[0011]
As shown in FIG. 2, the bracket 4 is provided with a belt-like frame 9 having a bearing support portion 8 between the fixing holes 6, and is provided in a direction from the outer peripheral flat portion 5 near the fixing hole 6 toward the stator side. The pressurizing arm 7 has a refracting shape that can be slightly deformed. The bearing support portion 8 and the pressurizing arm 7 are arranged such that each pressure is applied after the motor is assembled to cause a slight deformation, but each small deformation does not affect the other.
[0012]
According to the above configuration, the fixing of the stator 10 is performed by a tightening process using a fixing screw of the bracket 4 without adding a process such as punching after press-fitting into the cylindrical motor frame 1 or fixing the stator 10 with screws alone. it can also serve as can the assembly work easier.
[0013]
The present invention can be configured in various modes other than those shown in the above-described embodiments. For example, the tip of the pressure arm 7 may be bent to increase the joint surface with the synthetic resin.
[0014]
【The invention's effect】
As described above, according to the present invention, it is possible to provide an electric motor that can facilitate the fixing operation of the stator, reduce the number of assembly steps, and facilitate automatic assembly.
[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 partial plan view of the electric motor according to an embodiment of the present invention. Sectional view of the motor of the machine 【Explanation of symbols】
DESCRIPTION OF SYMBOLS 1 Cylindrical motor frame 2 Outer ring part 4 Metal bracket 6 Fixing hole 7 Pressurizing arm 10 Stator 11 Synthetic resin 12 Winding 14 Armature

Claims (1)

A cylindrical motor frame having an outer peripheral annular portion on the opening side, a stator having a laminated core partially covered with a synthetic resin and windings, an armature disposed opposite to the stator, and the electric machine at the same time a centrifugal fan attached to the distal end of the rotating shaft of the child, the more composed motor a metal bracket having a pressure arm that can be small variations when securing the metal bracket on the outer peripheral annular portion of the tubular motor frame The pressurizing arm sandwiches the synthetic resin portion of the stator, and the metal bracket has an outer peripheral plane portion, and a plurality of fixing holes are provided in the outer peripheral plane portion, and the outer periphery is further provided. A belt-like frame having a bearing support portion of the rotating shaft is provided between the fixing holes of the flat portion, and the pressing arm of the outer peripheral flat portion in the vicinity of the fixing hole is directed to the stator side. Motor having a structure that is provided to direction.

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