JPH0723020Y2 - Electric motor - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention provides a stator winding of an electric motor used for applications such as deep well underwater electric motors, which have a relatively small diameter and whose outer diameter is restricted. The present invention relates to an electric motor including a mounted stator core and a frame.

[Prior art]

Conventionally, in this type of motor, there are the following two examples of the stator structure of the motor in which the frame completely covers the stator winding.

FIG. 7 is a partial sectional view showing an example of the structure. In the figure, 5 is a frame, which is formed by bending a thin metal plate and welding it in the longitudinal direction. A stator core 1 formed by laminating silicon steel plates in the frame 5
Is inserted and fixed by a fixing means such as welding or pin driving. Further, a side plate 7 is annularly formed with a beat 5a and welded to an end portion of the frame 5 so as to completely cover the stator winding 4. In the figure, 2 is a wedge and 3
Is an insulating paper.

FIG. 8 is a partial cross-sectional view showing another structural example. In the figure, the parts designated by the same reference numerals as those in FIG. 7 indicate the same or corresponding parts (hereinafter, the same applies to other drawings).
This structure uses a thick steel pipe as the frame 5,
The stator core 1 is fixed to this inner circumference by means such as welding or pin driving, and a part of the frame retaining ring 6 is accommodated in a portion of the steel pipe frame 5 outside the end of the stator winding 4. Side plate 7 that is processed into the shape of a concave groove so that it can be removed
Is attached.

[Problems to be solved by the device]

Among the above-mentioned conventional stator structures for electric motors, the structure shown in FIG. 7 requires a smaller stator core 1 diameter and a larger laminated thickness when the stator winding 4 needs to be replaced during maintenance. Since the side plate 7 cannot be removed, it is difficult to replace the stator winding 4, and it is necessary to replace all the stators.

On the other hand, in the structure example shown in FIG. 8, the stator winding 4 can be maintained, but in this case, the centering of the frame end and the forming of the groove are required. In addition, the inner wall of the frame 5 for fitting the stator core 1 together is processed to increase the thickness of the steel pipe of the frame material, and if the frame 5 is required to have corrosion resistance, the frame material becomes expensive. However, there is a drawback that the manufacturing cost becomes expensive. In addition, the fitting portion of the stator core 1 and the stator winding 4
However, the frame thickness of the end of the motor becomes unnecessarily thick, and the heat dissipation performance of the electric motor is inferior to that of the structure shown in FIG.

The present invention has been made in view of the above points, and eliminates the drawbacks of the structure shown in FIGS.
By utilizing the advantages of the structure shown in the figure, it is possible to provide an electric motor in which the maintenance work of the stator winding 4 is easy, the heat radiation performance of the electric motor is good, and the manufacturing cost is low.

[Means for Solving the Problems]

According to the present invention for solving the above problems, a frame portion of an electric motor stator to which a stator core having a winding is inserted and fixed is completely covered up to the winding end portions, and side plates are attached to both end portions of the frame. In a motor in which an electric motor bracket for mounting a bearing of a rotor main shaft or the like on the side plate is tightened and fixed with bolts, a frame is formed by bending a thin plate material into a cylindrical shape, and a laminated portion of a stator core is formed in the frame. Covering a portion protruding from the laminated portion in the longitudinal direction by a predetermined dimension,
Furthermore, the ends of a cylindrical frame end member having a thickness larger than that of the frame are connected to both ends of the frame by welding,
As a result, the winding end portion is completely covered, a groove is provided in a part of the inner circumference of the frame end member, the side plate is inserted in the inner circumference of the frame end member, and a part is cut out in the groove. The ring-shaped frame retaining ring is detachably accommodated, the side plate is engaged with the portion of the frame retaining ring protruding by the inner circumference of the frame end member, and the frame retaining ring is sandwiched between the side plates to bolt the motor bracket. It is characterized by being tightened and fixed with.

[Action]

In the present invention, by constructing the electric motor as described above, most of the frame, that is, the laminated portion of the stator core and the portion protruding from the laminated portion by a predetermined length in the longitudinal direction are formed of thin plate materials. Compared with the conventional structure shown in (1), the manufacturing cost is lower, the heat radiation effect is good, and the temperature rise of the electric motor can be suppressed low.

Further, since the frame side plate can be attached / detached by attaching / detaching the frame retaining ring to the concave groove on the inner periphery of the frame end member, the stator winding is rewound as compared with the conventional structure shown in FIG. Easy to repair.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial sectional view showing a stator structure of an electric motor according to the present invention, and FIG. 2 is a sectional view of an electric motor having this stator structure.

As shown in FIG. 1, a stator structure for an electric motor according to the present invention is constructed such that at least the stator core 1 of a stator core 1 or a frame 5 covering the stator winding 4 and the insulating paper 3 attached to the stator core 1. A portion longer than the laminated thickness is formed by bending a thin plate material in an annular shape and welding in the longitudinal direction.

As a method for welding the frame 5 and the stator core 1 and for preventing the bending, there are methods shown in FIGS. 4, 5 and 6.
That is, in the method of FIG. 4, when performing longitudinal welding of the frame 5, the outer circumference of the stator core 1 is included in a part of the groove portion,
The frame 5 and the stator core 1 are simultaneously welded by forming a welding beat 10a.

In the method shown in FIG. 5, the frame 5 is attached to the stator core 1.
On the pin 9 after forming a welding beat 10b and welding.
It is a method of driving and stopping rotation. Reference numeral 10c is a welding beat that fixes the pin 9 and the frame 5.

The method shown in FIG. 6 is a method of forming a welding beat 11 on the inner surface of the frame 5 and the corner portion of the stator core 1 and welding them.

At the end of the frame 5 formed as described above, the frame 5
The frame end member 8 formed in an annular shape thicker than the plate thickness is welded by forming a welding beat 12 on the circumference of the frame 5.

As described above, the inner periphery and the end surface of the frame end member 8 are welded to the end portion of the frame 5 and processed to perform the spigot and the centering with the bracket, and the frame side plate 7 that is detachable.
The frame retaining ring 6 is housed between the frame end plate 8 and the frame side plate 7 by forming a groove on the inner peripheral surface of the frame end member 8.

FIG. 3 is a view showing the structure of the frame retaining ring 6,
The frame retaining ring 6 has a notched structure so as to show a part of an elastic metal ring. The frame retaining ring 6 is fixed in the groove by fitting the frame retaining ring 6 into the groove formed in the inner peripheral surface of the frame end member 8 by its elastic force.

An example of the overall structure of the electric motor having the above-described electric motor stator structure is shown in FIG. In the figure,
At least a portion of the frame 5 that is longer than the laminated thickness of the stator core 1 is formed by bending a thin plate material into an annular shape and welding in the longitudinal direction as described above. A frame end member 8 is welded to the end of the frame 5, and a frame retaining ring 6 is housed in a groove for fixing the frame side plate 7. Welding and bending prevention of the frame 5 and the stator core 1 are performed by the method shown in FIGS. 4, 5 and 6 above.

The rotor core 14 fixed to the main shaft 15 is provided in the hole of the stator core 1.
The main shaft 15 has a load-side radial bearing having a load-side radial metal 18 fixed to the load-side bracket 16 and an anti-load-side bearing having an anti-load-side radial metal 19 fixed to the anti-load-side bracket 17. It is rotatably supported by a radial bearing. A seal mechanism such as an oil seal 20 and a sand slinger 21 is provided at the load-side end of the main shaft 15 to seal the load, for example, the pump side. Reference numeral 22 is a cable for supplying a drive current to the electric motor.

A thrust disk 23 is provided on the side of the main shaft 15 opposite to the load end of the main shaft 15.
Is fixed, and the thrust disk 23 and the centering device 24
A thrust bearing is constituted by the above. Further, the anti-load side bracket 17 is provided with a thrust bearing case 25 for accommodating the thrust bearing, and a lower portion of the thrust bearing case 25 is composed of a diaphragm 26 and the like, and is enclosed in the frame 5. A pressure adjusting device for adjusting the liquid pressure of the liquid Q is provided. 27 is the diaphragm 26
It is a diaphragm holder that holds down.

In the electric motor having the above structure, the frame 5 is made of a metal plate material such as stainless steel having a thin meat pressure, so that the manufacturing cost is low and the heat dissipation is good. Further, since the frame side plate 7 can be attached and detached, the rewinding repair of the stator winding 4 and the like become easy.

[Effect of device]

By adopting the above configuration, the present invention has the following effects as described in the specification.

Since most of the frame, that is, the laminated portion of the stator core and the portion protruding from the laminated portion by a predetermined dimension in the longitudinal direction are formed of thin plate materials, the manufacturing cost is lower than that of the conventional structure shown in FIG. The cost is low, the heat dissipation is good, and the temperature rise of the electric motor can be suppressed low.

Also, the frame side plate is attached and detached by the frame retaining ring,
Since it can be attached and detached, the stator winding can be easily rewound and repaired as compared with the conventional structure shown in FIG.

[Brief description of drawings]

FIG. 1 is a partial sectional view showing a stator structure of an electric motor according to the present invention, FIG. 2 is a sectional view of an electric motor having the stator structure, and FIG. 3 is a view showing a structure of a frame retaining ring. Fourth
FIGS. 5, 5 and 6 are views showing a method of fixing the frame and the stator core, and FIGS. 7 and 8 are partial sectional views showing a conventional stator structure of an electric motor. In the figure, 1 ... Stator core, 2 ... Wedge, 3 ... Insulating paper, 4 ... Stator winding, 5 ... Frame, 6 ... Frame retaining ring, 7 ... Frame side plate, 8 ... Frame end member, 9 ... pin, 10a, 10b, 10c, 11,12 ... welding beet.

Claims (1)

[Scope of utility model registration request] 1. A frame portion of an electric motor stator, into which a stator core having a winding mounted therein is inserted and fixed, completely covers the end portions of the winding, and side plates are attached to both end portions of the frame. In an electric motor in which an electric motor bracket for mounting a bearing of a rotor main shaft is tightened and fixed with bolts, the frame is formed by bending a thin plate material into a cylindrical shape, and the frame is formed by laminating the stator core and the laminated portion. The end of a cylindrical frame end member having a thickness larger than the thickness of the frame is welded to both ends of the frame so as to cover a portion protruding by a predetermined dimension in the longitudinal direction from the portion, and thereby the winding The end part is completely covered, and a groove is provided in a part of the inner circumference of the frame end member,
The side plate is inserted into the inner periphery of the frame end member, the ring-shaped frame retaining ring partially cut out in the groove is detachably accommodated, and the frame retaining ring pops out by the inner periphery of the frame end member. An electric motor characterized in that the side plate is engaged with the open portion, and the frame bracket is sandwiched between the side plates and the electric motor bracket is fastened with a bolt.