JPS5930595Y2 - Magnetic frame with laminated iron plates for vehicle electric motors - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a magnetic frame with laminated iron plates for a vehicle electric motor.

Describe the general structure of a vehicle electric motor using Figure 1.
The main electric motor 11 is loaded on a bogie frame 12, and a small gear (not shown) attached to the drive shaft (not shown) is mounted on a wheel 1.
Rotational force is transmitted to the wheels 13 by meshing with a large gear (not shown) of an axle 14 to which the wheels 3 are fixed.

The distance A between the centers of the drive shaft of the main electric motor 11 and the axle 14 is
It is the same as the distance between the centers of the small gear and large gear mentioned above,
It is determined based on vehicle speed, pulling force, distance between wheels, etc., and cannot be made too large.

For this reason, the size of the outer diameter B of the magnetic frame (hereinafter referred to as frame) 15, which is usually called a magnet frame of the main motor 11, is limited, and furthermore, the size of the outer diameter B between the main motor 11 and the axle 14 is constant. However, if the capacity of the main motor 11 is increased in order to obtain a large rotational force, the outer diameter B of the main motor 11 will also be increased, so a portion 15A of the frame 15 has been cut out.

Further, in order to improve the magnetic flux response, a laminated iron plate 16 consisting of a large number of thin iron plates of an appropriate width is provided concentrically over the entire circumferential direction as shown in FIG. 2 on the inner periphery of the frame 15.

Such a magnetic frame with laminated iron plates, that is, a frame 15 having a laminated iron plate 16 on the inner periphery, has a plurality of field cores 17 on the inner periphery of the laminated iron plate 16 at equal intervals in the circumferential direction, and bolts 18, respectively.
I am trying to install one.

By the way, as shown in FIGS. 3 and 4, the field core 17 is attached to the frame 15 and the laminated iron plate 16 with a diameter E.
The field core 17 is mounted by drilling holes No. 2 and counterboring the frame 15 with a diameter E1, fitting a stepped mounting washer 19 therein so as to embed it, and screwing in a bolt 18.

In this case, the mounting washer 19 is also counterboreed to correspond to the thickness of the head of the bolt 18, so that the gap C between the main motor 11 and the axle 14 is secured.

However, this structure has the following drawbacks.

That is, the inner thickness D1 remaining after counterbore the diameter E1 of the frame 15 and the inner thickness D2 of the flange of the mounting washer 19 inserted therein need to be constant thicknesses from the viewpoint of strength.

In particular, the remaining thickness Dl of the frame 15 remains as Dl in the upper and lower x1 parts shown in Fig. 3, but is thinner in the y1 part in the left and right axial direction shown in Fig. 4. This means that almost nothing remains.

Therefore, the load that tightens the field core 17 is applied to the upper and lower X1 parts, and is not applied to the left and right parts 71.
It is impossible to reduce the inner thickness D1 of one part of the frame 15.

Similarly, since the flange of the mounting bracket 19 is not fully loaded with load, it needs to be thicker than when it is fully loaded, which defeats the purpose of making this portion thinner.

Furthermore, since the laminated iron plate 16 has a structure in which a large number of thin iron plates are laminated in the axial direction of the frame 15, it is weak against loads in the radial direction. If not, there was a risk that the laminated iron plates would protrude or loosen.

In addition, in order to sufficiently increase the remaining inner thickness DI of the frame 15, the hole diameter E2 and the counterbore hole E1 must be made thicker, but there is a limit to increasing these because the magnetic resistance of the magnetic circuit increases. there were.

As shown in FIG. 5, if the thickness F of the non-laminated portion of the frame 15 after the notch is made thinner, the rigidity of the frame 15 becomes weaker and cracks may occur due to vibration, so there is a limit.

In order to avoid such drawbacks, as shown in FIG. 6 or 7, the laminated iron plate 16 is not provided at the tightening portion of the mounting bolt 18 of the field core 17 on the axle 14 side of the frame 15, and only that portion is provided. Although it has been proposed that the structure protrudes from the inner periphery, this method also has the following drawbacks.

In other words, the frame 15 is generally constructed by cutting the inner peripheral surface into a circular shape using a vertical lathe, but since the inner peripheral surface of the frame 15 is not circular as shown in FIGS. 6 or 7,
It is impossible to cut with a conventional vertical lathe, and therefore the troublesome cutting process must be performed with a milling machine, etc., which significantly increases processing costs and reduces the processing accuracy compared to a vertical lathe. Moreover, it is troublesome to form the laminated iron plate 16 according to the non-circular inner circumferential surface, and it is also difficult to closely attach the laminated iron plate 16 to the inner circumferential surface of the frame 15, resulting in a gap that causes magnetic flux response characteristics. There were drawbacks such as a decline in

The present invention eliminates these drawbacks, and its purpose is to easily and accurately cut the inner circumferential surface of the frame and form the laminated steel plates accordingly, so that there is no gap between the inner circumferential surfaces of the frame and the laminated steel plates are laminated. It is possible to install a steel plate without causing a decrease in magnetic flux response characteristics, and without changing the distance A between the axles and the gap C, and the installation of the field core ensures sufficient strength and rigidity of the frame. In addition, it is an object of the present invention to provide a magnetic frame with laminated iron plates that can increase the overall outer diameter, that is, the capacity of the motor.

An embodiment of the present invention will be described below with reference to FIG. 8. 6 In order to increase the capacity, the frame 31 is designed to increase the position directly beside the axle 14, that is, the outer surface on the side of the axle 14, without changing the distance between the axles and the gap between the axles 14. 31A, the overall outer diameter B is increased.

In addition, the notch increases the rigidity of the frame 31 and the field core 1.
In order to maintain sufficient wall thickness at these parts so as not to reduce the mounting strength of the frame 31, the inner circumferential surface of the frame 31 is
By cutting along arcs with equal radii of curvature R2 centered on two eccentric points 021 and 022 that are symmetrically spaced apart from the center axis o1 by an equal distance vertically, two upper and lower concave arc surface views are obtained. 31B and 31C.

In addition, the cutting process can be performed twice with the same machining radius using a vertical lathe, that is, once with the center position at 021 and once with the center position at 022, and the number of cutting processes using the vertical lathe will increase. Compared to cutting using a milling machine, it is simpler and easier, the processing time is significantly shorter, and the processing accuracy is also very high.

On the other hand, the laminated iron plate 32 has a vertically symmetrical two-part structure, and is formed into a crescent shape with an arcuate outer peripheral surface having the same curvature as the concave arcuate surfaces 31B and 31C, and is closely spaced within the concave arcuate surfaces 31B and 31C. installed individually.

Each of the field cores 17 on the inner periphery of the magnetic frame with such a configuration is fitted directly into the frame 31 with each bolt 18 without using a mounting washer.
It is installed with tightening.

FIG. 9 shows another embodiment of the present invention, in which the frame 4
4 concave circular arc surface parts 41B, which are the same as the number of magnetic poles, on the inner peripheral surface of 1;
41C, 41D, and 41E are cut, and one laminated iron plate 42 having an arcuate outer peripheral surface of the same curvature is closely attached to each of them.

Note that each of the arcuate surface portions 41B to 41E on the inner circumferential surface of the frame 41 has four eccentric points 031 to 03 equally spaced in all directions from the central axis 01 of the frame 41, respectively.
4, each having an equal radius of curvature R3, is cut using a vertical lathe.

FIG. 10 shows still another embodiment of the present invention, in which the frame 51 is not round but rectangular, and in this case as well, the inner peripheral surface of the frame 51 is equally spaced in four directions from its central axis 01. Four eccentric points 041 to 0 spaced apart from each other
Concave arcuate surfaces 51B, 51C, 51D, and 51E with the same radius of curvature R4 centered at 44 are formed by cutting with a vertical lathe, and laminated iron plates 52 each having an arcuate outer peripheral surface with the same curvature are closely attached to each of them. This is what I did.

FIG. 11 also shows another embodiment of the present invention, in which a rectangular frame 61 is used as in FIG. .

According to the present invention, as described above, in the magnetic frame with laminated iron plates for a vehicle electric motor, there are a plurality of magnetic frames on the inner circumferential surface of the frame that are equally spaced from the central axis and equally spaced from each other in the circumferential direction. Concave arcuate surfaces with the same radius of curvature are formed by cutting, with each eccentric point as the center, and a laminated iron plate is attached to each, so that the notch on the axle side of the frame and the field core mounting area are sufficient. It can be constructed thickly to maintain rigidity, and the field core can be firmly mounted directly with bolts without using a mounting washer using large diameter holes and counterbore processing as in conventional examples. The overall outer diameter of the frame can be increased without changing the distance between the axles and the gap between the axles, and the capacity of the electric motor can therefore be increased.

In addition, each concave arc surface on the inner circumference ml of the frame can be machined using a vertical lathe, so the machining is simple and easy, and high processing accuracy can be obtained, and the laminated iron plates each have a circle with the same curvature as the concave arc surface. Since it is only necessary to mold it to have an arcuate outer circumferential surface, it is easy to manufacture and can be easily and securely attached to the concave arcuate surface, so that a gap (space) is created between them. Moreover, by arranging each of the laminated iron plates in the path of the magnetic flux φ between the magnetic poles as shown in FIG. 9, there is no possibility that the magnetic flux response characteristics will deteriorate.

Since this idea has been developed as described in detail above, the cutting of the inner peripheral surface of the frame and the corresponding forming of the laminated iron plate can be done easily and with high precision, and the laminated iron plate can be placed in close contact with the inner peripheral surface of the frame without any gaps. In addition to being able to prevent the deterioration of magnetic flux response characteristics by attaching a The practical effect of the magnetic frame with laminated iron plates for a vehicle electric motor is very large, since it can increase the overall outer diameter, that is, increase the capacity of the electric motor.

[Brief explanation of the drawing]

Figures 1 to 7 show a conventional example. Figure 1 is a partially sectional side view showing the installation state of the traction motor, and Figure 2 is a part of the axial direction of the magnetic frame with laminated iron plates of the traction motor. Cross section, 3rd
The figure is a diametrical cross-sectional view of the field core attachment part of the magnetic frame with laminated iron plates, Figure 4 is a cross-sectional view taken along line 4-4 in Figure 3, and Figure 5 is a cross-sectional view of the axle side notch of the magnetic frame with laminated iron plates. A sectional view corresponding to FIG. 3 in a large case, FIGS. 6 and 7 are diametrical sectional views of different types of magnetic frames with laminated iron plates, and FIG. 8 is an implementation of the magnetic frame with laminated iron plates of the present invention. FIGS. 9 to 11 are diametrical sectional views showing different embodiments of the magnetic frame with laminated iron plates of the present invention. 14...Axle, 17,62...Field core, 31゜41.51.61...Magnetic frame (frame), 31A...Notch , 31B, 31C,
41B to 41E. 51B to 51E... Curved circular arc direction part, 32, 42°5
2, 64... Laminated iron plate, 01... Frame center axis, 021.022.031 to 034,
041 to 044.04...Eccentric point, R2,
R3, R4°R5... Radius of curvature.

Claims (1)

[Scope of utility model registration request] In a magnetic frame with a laminated iron plate for a vehicle electric motor, which is equipped with a laminated iron plate consisting of a large number of thin iron plates laminated in the axial direction on the inner circumference of the magnetic frame, this center axis is attached to the inner circumference of the upper air magnetic frame. The laminated iron plate is shaped by cutting concave arcuate surfaces having equal radii of curvature centered on a plurality of eccentric points equally spaced from the core and equally spaced from each other in the circumferential direction. 1. A magnetic frame with a laminated iron plate for a vehicle electric motor, characterized in that each concave arcuate surface portion of the frame has an arcuate outer circumferential direction equal to the curvature, and is attached to each concave arcuate surface portion of the frame.