JPH0116368Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a bracketless rotating machine, and particularly to a rotating machine in which the brackets conventionally used to support bearings and stators and to cover internal parts are omitted.

BACKGROUND OF THE INVENTION Generally, various types of rotating machines such as induction motors, synchronous motors, stepping motors, and brushless motors have brackets for supporting bearings and stators and for covering internal parts.

Taking a stepping motor as an example of a rotating machine, as shown in FIG. is rotatably supported, and a rotor 6 is attached to the shaft 5. In order to prevent the shaft 5 from moving in the axial direction, two grooves 5a are formed in the shaft 5.
Snap rings 7 and 8 are fitted into each of the snap rings 5b, and liners 9a and 9b are provided between the snap ring 7 and the bearing 3 and between the snap ring 8 and the bearing 4, respectively.

Furthermore, a stator 10 that provides rotational force to the rotor 6 is supported by the brackets 1 and 2. The stator 10 consists of a stator core 11 and a winding 13 wound around the outer periphery of the stator core with an end form 12 interposed therebetween.

However, in a conventional rotating machine having such brackets 1 and 2, the number of parts is large;
This method has disadvantages in that the number of assembly steps and the number of processing steps are increased, and furthermore, it is difficult to assemble the brackets 1 and 2 from both sides of the stator 10.

Furthermore, in conventional rotating machines, the mutual positioning of the rotor 6 and stator 10 was performed using three parts: the brackets 1 and 2, the bearings 3 and 4, and the shaft 5. In order to maintain the dimension of the gap g between the brackets 1 and 10 with high accuracy,
4 and the shaft 5, especially the brackets 1 and 2, which have complicated shapes, have to be machined with high precision.

Furthermore, in the conventional rotating machine, since the winding 13 was covered by the brackets 1 and 2, the temperature of the winding 13 rose as the rotating machine rotated.
As a result, there was a drawback that torque increase was limited.

Purpose of the invention The present invention was devised in view of the above-mentioned drawbacks of the conventional technology.The purpose of the invention is to provide an easy-to-assemble, low-cost product with a small number of assembly and processing steps, and to be compact, lightweight, and highly accurate. An object of the present invention is to provide a bracketless rotating machine with excellent cooling capacity.

Structure of the Invention In the bracketless rotating machine of the present invention that achieves the above object, at least a portion of the bearing is formed of a non-magnetic material and is directly attached to the stator.
The non-magnetic material prevents magnetic flux from passing through the bearing. The shaft is supported by a bearing, and the rotor is attached to the shaft.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 2 shows a preferred embodiment of the bracketless rotating machine according to the present invention. In this figure, the same parts as those of the rotating machine shown in FIG. 1 are designated by the same reference numerals.

The characteristic feature of this invention is that the bearings 14, 1
5 is directly attached to the stator 10.

That is, mounting portions 14a and 15a consisting of recesses are formed in parts of the opposing inner surfaces of the bearings 14 and 15, and both ends 11 of the stator core 11
These mounting parts 14a and 15a are fitted into the bearings 14 and 11b, respectively, and the bearings 14 and 15 are attached to the stator 10.
is supported by Each of the bearings 14 and 15 is made of a non-magnetic material, and is designed to prevent magnetic flux from passing through the bearings 14 and 15.

As described above, in the present invention, since the bracket used in the conventional rotating machine is omitted, the number of parts is small and assembly is easy, and the number of assembly steps and processing steps are reduced. As a result, the rotating machine becomes lighter, smaller, and lower in cost.

Further, since the mutual positioning of the rotor 6 and stator 10 is performed by two parts, the shaft 5 and the bearings 14 and 15, the rotor 6 and the stator 1
0 can be maintained with high accuracy, and the performance of the rotating machine can be improved. Further, if the dimensional accuracy of the gap g is set to be the same as in the conventional case, when machining the bearings 14 and 15, high-precision machining as required when using a conventional bracket is not required.

Furthermore, in the present invention, since the winding 13 is in direct contact with the outside air, the effect of cooling the winding 13 is enhanced, and there is no restriction on torque increase due to a rise in the temperature of the winding 13. In the structure of this embodiment, the winding 13 is directly affected by external force, but by locally molding the winding 13 with epoxy resin, etc., the cooling effect of the winding 13 can be maintained. , can strengthen protection against external forces.

FIG. 3 shows another embodiment of the bracketless rotating machine according to the present invention. In this figure, the same parts as those in the embodiment shown in FIG. 2 are designated by the same reference numerals.

The characteristic feature of this embodiment is that the shaft 5
is rotatably supported by a single bearing 16 having a long axial length, and this bearing 16 is directly attached to the stator 10.

In this way, if the shaft 5 is supported by the bearing 16 having a long axial length, the shaft 5 will not rotate eccentrically, so even one bearing 16 can sufficiently support the shaft 5. can do. In this case, one end 11a of the stator core 11
, a mounting portion 1 consisting of a recess formed in the bearing 16
6a, the bearing 16 is directly attached to the stator 10. Note that the bearing 16 of this embodiment is made of a non-magnetic material as in the previous embodiments, and prevents magnetic flux from passing through the inside of the bearing 16.

In each of the embodiments described above, the entire bearing is made of a non-magnetic material, but a part thereof may be made of a non-magnetic material, or a part of the magnetic flux path may be provided with a non-magnetic material. The magnetic flux may be prevented from passing through the bearing.

Effects of the invention As explained above, according to the invention, since the bearing is directly attached to the stator, assembly is easy, the number of assembly steps and machining steps is small, and the cost is low. A bracketless rotating machine can be provided. Further, according to the present invention, since the bracket that covers the windings is omitted, the cooling effect of the windings can be enhanced, contributing to improving the performance of the rotating machine.

[Brief explanation of the drawing]

FIG. 1 is a half sectional view showing an example of a conventional rotating machine equipped with a bracket, and FIGS. 2 and 3 are half sectional views showing different embodiments of the bracketless rotating machine according to the present invention. . 5...Shaft, 6...Rotor, 10...Stator, 14-16...Bearing.

Claims (1)

[Claims for Utility Model Registration] (1) A bracketless rotating machine having bearings 14, 15, 16, a shaft 5, a rotor 6, and a stator 10, wherein at least one of the bearings 14, 15, 16 A portion of the shaft 5 is formed of a non-magnetic material, and the shaft 5 is connected to the bearings 14, 15, 16.
The rotor 6 is mounted on the shaft 5, and the bearings 14, 15, 16 are supported on the stator 1.
0, and the non-magnetic material causes magnetic flux to flow through the bearings 14, 15,
1. A bracketless rotating machine, characterized in that the bracketless rotating machine prevents the bracket from passing through the interior of the bracket. (2) The bracketless rotating machine according to claim 1, wherein two bearings 14 and 15 are provided on both sides of the shaft 5. (3) The bearing consists of one bearing 16 that pivotally supports one end of the shaft 5, and the one bearing 16 has a relatively long length in the portion that pivotally supports the shaft 5. The bracketless rotating machine according to scope 1.