JP2003070208A - Ac servomotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an AC servomotor in which heat generated by an armature is transmitted to a load side bracket to suppress the temperature rise of the armature. SOLUTION: This AC servomotor 1 has an armature core 5 on which armature coils 6 are wound and which is molded with resin as a whole except its surface facing a permanent magnet 3, and a bracket 8 on a load side and a bracket 9 on a side opposite to the load between which the armature core 5 is held. At least one or more heat absorbing side holes 12 which do not pierce in the axial direction are formed at an end surface on the load side of the armature core 5, and heat radiating side holes 13 as many as the heat absorbing side holes are formed at an end surface on the side opposite to the load at positions same as the positions of the heat absorbing side holes 12. Heat conducting rods 14 are mated with both the holes 12 and 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AC servomotor used in a semiconductor manufacturing apparatus or the like which requires high precision positioning.

[0002]

2. Description of the Related Art A conventional AC servomotor has a permanent magnet serving as a field on the rotor side and an armature on the stator side. The armature is an armature core around which an armature coil is wound. , And is entirely molded with resin except for the surface facing the permanent magnet. Further, the armature has a structure in which the resin portions on both sides in the axial direction are sandwiched between the load side bracket and the non-load side bracket.

[0003]

However, in such a conventional AC servo motor, since the armature core is molded with resin, the heat generated in the armature is hard to be transferred to the load side bracket, and therefore the electric machine There was a problem that the temperature rise of the child was large. Therefore, an object of the present invention is to provide an AC servomotor capable of favorably transmitting the heat generated by the armature to the load side bracket and reducing the temperature rise of the armature.

[0004]

In order to solve the above problems, the present invention comprises a permanent magnet serving as a field on the rotor side and an armature on the stator side, and the armature comprises:
The armature core around which the armature coil is wound is entirely molded with resin except for the surface facing the permanent magnet, and the resin portions on both axial sides are provided on the load side bracket and the anti-load side. AC configured by sandwiching with bracket
In the servo motor, at least one heat absorbing side hole that does not penetrate axially is provided on the load side end surface of the armature core, and at the same position as the heat absorbing side hole on the non-load side end surface of the load side bracket. The same number of holes on the heat radiating side are provided, and heat conducting rods having good heat conductivity are fitted and arranged in both holes.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of an AC servomotor showing an embodiment of the present invention. In the figure, an AC servomotor 1 includes a shaft 2 and a permanent magnet 3 serving as a field on the rotor R side, and an armature 4 on the stator S side. The armature 4 is an armature core 5 around which an armature coil 6 is wound.
However, except for the surface facing the permanent magnet 3, it is entirely molded with resin 7. Further, the armature 4 is configured by sandwiching the resin 7 on both sides in the axial direction between a load side bracket 8 and an anti-load side bracket 9. The shaft 2 is rotatably supported by the load side bracket 8 and the anti-load side bracket 9 via bearings 10 and 11. The armature core 5 is provided with at least one heat-absorbing hole 12 on the load-side end face that does not penetrate in the axial direction. Further, on the end face of the load side bracket 8 opposite to the load side, the same number of holes 13 on the heat radiating side are provided at the same positions as the holes 12 on the heat absorbing side, and a heat conducting rod 14 made of studs having good heat conductivity is provided. , Both holes 12 and 13 are fitted and arranged. In such a configuration, the heat generated in the armature 4 is transmitted to the load side bracket 8 through the heat conducting rod 14 having good heat conduction, and is dissipated to the outside of the motor or is transmitted to an external member. As a result, the temperature rise of the armature 4 is reduced. If the heat-conducting rod 14 is made of a heat pipe having better heat conduction than the stud, the amount of heat transferred from the armature 4 to the load side bracket 8 is further increased, and the temperature rise of the armature is further reduced. To be done.

[0006]

As described above, the present invention has the following effects. (1) The heat-conducting rod with good heat conduction is placed between the armature core and the load-side bracket so that heat can be conducted, so that the heat generated by the armature can be efficiently transferred to the load-side bracket. The temperature rise of the armature can be reduced. (2) By arranging a heat pipe with better heat conductivity instead of a stud with good heat conductivity, heat can be more efficiently transferred to the load side bracket, and the temperature rise of the armature can be greatly reduced. it can.

[Brief description of drawings]

FIG. 1 is a side sectional view of an AC servomotor showing an embodiment of the present invention.

[Explanation of symbols]

1 AC servo motor, 2 shafts, 3 permanent magnets, 4 armatures, 5 armature core, 6 armature coil, 7 resin, 8 Load side bracket, 9 Anti-load side bracket, 10 bearings, 11 bearings, 12 Heat absorption side hole, 13 holes on the heat dissipation side, 14 Heat conduction rod

Claims (3)

[Claims] 1. A permanent magnet serving as a field is provided on the rotor side, and an armature is provided on the stator side.
The armature core around which the armature coil is wound is entirely molded with resin except for the surface facing the permanent magnet, and the resin portions on both axial sides are provided on the load side bracket and the anti-load side. AC configured by sandwiching with bracket
In the servo motor, at least one heat absorbing side hole that does not penetrate axially is provided on the load side end surface of the armature core, and at the same position as the heat absorbing side hole on the counter load side end surface of the load side bracket. An AC servomotor characterized in that the same number of holes on the heat radiation side are provided, and heat conducting rods having good thermal conductivity are fitted and arranged in both holes. 2. The AC servomotor according to claim 1, wherein the heat conducting rod is a stud. 3. The AC servomotor according to claim 1, wherein the heat conducting rod is a heat pipe.