JP2003153486A - Ac motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an AC motor wherein a turn stop of a stator can be realized by simple structure easy to be worked, and heat generated by a stator coil is hard to be conducted to a rotation detector arranged on an anti-load side. SOLUTION: Resin 5 covering a stator coil 4 is interposed and arranged also between an anti-load side end portion of the frame 2 and an anti-load side bracket 7, and a screw hole 11c is formed in the resin 5. A through screw 12 is made to pass not only a load side bracket 6, the frame 2 and the anti-load side bracket 7, but also the resin 5, thereby imparting turn stop function of a stator 1 to the resin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AC motor in which a stator coil is molded with resin.

[0002]

2. Description of the Related Art A conventional AC motor, such as an AC servomotor, has a rotor inside and a stator having a stator coil molded with resin is fitted on the inner peripheral surface of a cylindrical frame. The load side bracket and the anti-load side bracket are attached from both sides in the axial direction of the frame, and the rotation detector is attached to the anti-load side bracket. When attaching the load side bracket and the anti-load side bracket to the frame,
Screw holes are formed in the load side bracket, the anti-load side bracket, and the frame, and the frame is sandwiched by the load side bracket and the anti-load side bracket by passing through screws through these holes. Further, rotation prevention between the stator and the frame has been performed by forming a hole in the frame and the stator core and then press-fitting a pin from the outside of the frame.

[0003]

However, such a conventional AC motor has the following problems. (1) The drilling process between the frame and the stator core and the pin press-in process are difficult to automate, and the productivity is poor. (2) Since the anti-load side bracket is directly attached to the frame in which the stator, which is a heating element, is fitted to the inner peripheral surface, the heat generated from the stator coil passes through the frame and the anti-load side bracket, and rotation is weak to heat. Easy to reach the detector. The present invention has been made to solve such a problem, and can prevent rotation of the stator with a simple structure that is easy to work, and further, the heat generated in the stator coil is applied to the anti-load side. An object of the present invention is to provide an AC motor that is hard to be transmitted to a rotation detector arranged.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention covers a stator core mounted on the inner surface of a cylindrical frame, a stator coil wound around the stator core, and the stator coil. And a load side bracket and an anti-load side bracket respectively attached to the axial ends of the frame, and the load side bracket and the anti-load side bracket are rotatably supported via bearings. An AC having a rotor and forming screw holes in the load-side bracket, the anti-load-side bracket, and the frame, and inserting a screw through the holes to sandwich the frame between the load-side bracket and the anti-load-side bracket. In the motor, apply the resin between the anti-load side end of the frame and the anti-load side bracket. The screw holes provided with also be interposed, in which the through screw was set to pass through the screw holes of the resin.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 is an exploded perspective view showing a stator and a frame according to an embodiment of the present invention, FIG. 2 is a perspective view showing a state where the stator and the frame of FIG. 1 are assembled, and FIG. 3 is a perspective view showing an AC motor according to the embodiment of the present invention. It is a figure. Figure 1
In FIG. 3, reference numeral 1 is a stator, and a stator core 3 fitted and attached to an inner surface of a cylindrical frame 2, a stator coil 4 wound around the stator core 3, and a stator coil 4 are molded so as to cover the stator coil 4. Resin 5
It consists of The stator core 3 is made of the resin 5
After molding by, the mold is moved as shown by the arrow in FIG. 1 and fitted to the inner peripheral surface of the frame 2. The frame 2
A load-side bracket 6 and an anti-load-side bracket 7 are attached to the axial end of the rotor 1 via the bearings 8 and 9.
0 is rotatably supported. The resin 5 has a larger diameter on the anti-load side portion and is disposed between the anti-load side end portion of the frame 2 and the anti-load side bracket 7. Further, screw holes 11a, 11b, 11c, 11d are formed in the load-side bracket 6, the frame 2, the anti-load-side end of the resin 5, and the anti-load-side bracket 7, and
The frame 2 is sandwiched between the load side bracket 6 and the non-load side bracket 7 by passing through screws 12 through the screw holes 11a to 11d. A rotation detector 13 is attached to the anti-load side bracket 7.
The frame 2 is made of a material having a high thermal conductivity, such as aluminum, for the purpose of improving the efficiency of transmitting the heat generated in the stator coil 4 to the load side bracket 6 via the stator core 3. Further, the outer periphery of the stator 1 and the frame 2 are fastened by shrinkage fitting or adhesion. In such a configuration, the stator 1
Is integrated with the resin portion 5, the stator core 3, and the stator coil 4, so that the stator 1 attached to the frame 2 is sandwiched between the load side bracket 6 and the anti-load side bracket 7 and fastened by the through screw 12. ,
The rotation of the stator 1 in the rotation direction can be prevented by passing the through screw 12 through the screw hole 8c provided in the resin 5.
Therefore, it is possible to eliminate the work of drilling the frame and the stator core and the process of press-fitting the pins, which are conventionally required, and the work becomes extremely simple. When the stator 1 and the frame 2 are fastened by shrinkage fitting,
Due to the anti-rotation effect of the through screw 12, the stator core 3
With this, it is possible to reduce the tightening margin of the shrink fit of the frame 2, and suppress the cogging torque generated by the deformation of the stator core 3 due to the shrink fit. Further, the resin 5 that molds the stator 1 has a lower thermal conductivity than metal materials such as the frame 2 and the brackets 6 and 7, so that the resin 5 is interposed between the frame 2 and the anti-load side bracket 7.
By interposing, the heat transfer to the rotation detector 13 arranged on the anti-load side can be suppressed. Therefore, the rotation detector 13 can be thermally protected.
Further, because the cooling heat radiation member and the like can be made small, the motor can be made smaller and have higher performance.
Needless to say, the present invention can be applied to a motor that does not have a rotation detector.

[0006]

As described above, the present invention has the following effects. (1) The resin molded so as to cover the stator coil is also placed between the anti-load side end of the frame and the anti-load side bracket, and a screw hole is provided so that the through screw passes through the through hole of the resin. Therefore, it is possible to easily prevent the stator from rotating without the need for troublesome processing and work such as forming a drilled hole in the stator core and press-fitting the pin, thereby improving the productivity. (2) When the stator and the frame are fastened by shrinkage fitting, the tightening effect of the through screw prevents the shrinkage of the shrinkage fitting of the stator core and the frame, which reduces the deformation of the stator core due to shrinkage fitting. It is possible to suppress the cogging torque generated by. (3) The resin that molds the stator has a lower thermal conductivity than metal materials such as frames and brackets, so it was placed on the anti-load side by interposing resin between the frame and the load side bracket. It is possible to suppress heat transfer to the detector. Therefore, the detector can be thermally protected, and the heat dissipation member and the like can be made small to miniaturize and improve the performance of the motor.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a stator and a frame in an embodiment of the present invention.

FIG. 2 is a perspective view showing a state where the stator and the frame of FIG. 1 are assembled.

FIG. 3 is a perspective view showing an AC motor according to an embodiment of the present invention.

[Explanation of symbols]

1 stator, 2 frames, 3 stator core, 4 stator coils, 5 resin, 6 Load side bracket, 7 Anti-load side bracket, 8 bearings, 9 bearings, 10 rotors, 11a to 11d screw holes, 12 through screws, 13 Rotation detector

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5H605 AA15 CC02 CC03 CC10 EA06                       EA15 FF06 GG06 GG18                 5H611 AA01 BB04 PP01 QQ01 QQ02                       UA08

Claims (2)

[Claims] 1. A stator comprising a stator core mounted on an inner surface of a tubular frame, a stator coil wound around the stator core, and a resin molded so as to cover the stator coil, and an axial direction of the frame. The load-side bracket and the anti-load-side bracket, each of which has a load-side bracket and an anti-load-side bracket attached to its end, and a rotor rotatably supported by the load-side bracket and the anti-load-side bracket via bearings. In the AC motor in which the frame is sandwiched between the load side bracket and the anti-load side bracket by forming screw holes in the frame and passing through screws through the holes, the resin is applied to the anti-load side end of the frame. The brackets are also placed between the anti-load side brackets and screw holes are AC motor, characterized in that through Di to the screw hole of the resin. 2. The AC according to claim 1, wherein a rotation detector is attached to the anti-load side bracket.
motor.