JPH07322566A - Manufacture of cooling unit - Google Patents

Abstract

PURPOSE:To enhance the cooling efficiency by making a spiral groove having same cross-section as a cooling pipe in the outer periphery of a stator and winding the cooling pipe and then resin molding the cooling pipe while applying a pressure for expanding and enlarging the inner wall face. CONSTITUTION:A stator 1 has outer peripheral surface in which a spiral groove of same shape as a cooling pipe 3 is made. The spiral cooling pipe 3 is set in the outer peripheral groove of the stator and secured to a lower mold K1 through a positioning mandrel K1d and then an upper mold K2a is fixed. Subsequently, an appropriate fluid pressure is applied from one end of the cooling pipe 3 while closing the other end. Since the cooling pipe 3 is held between the stator 1 and the lower mold K1a and internally applied with the fluid pressure, it is shaped similarly to the surface of the outer peripheral groove of the stator 1 and a sufficient contact face is provided to eliminate the gap. A resin mold is then set from part A of the upper mold K2a while applying the fluid pressure continuously from the part B until the impregnated resin is cured. This method produces a structure having high cooling efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a cooling device which prevents an error in servo calculation due to thermal expansion due to self-internal heat generation etc.

[0002]

2. Description of the Related Art As a conventional example seen as a conventional technique, a system in which a cooling pipe is provided on the outer peripheral portion of a stator by resin molding is generally practiced.

[0003]

However, in the conventional example, the contact area between the stator and the pipe cannot be wide, and
Since the negotiation pressure between the two could not be controlled, the cooling efficiency was poor. Once a resin mold is made between the two, they are no longer integrated, so there is no way to do it later. Here, it is an object of the present invention to provide a method for manufacturing an ideal cooling device by wiping off all the bottlenecks in the conventional example.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention maximizes the contact area between the outer peripheral portion of the stator and the cooling pipe. This is a method for manufacturing a cooling device in which the contact pressure between the two is increased as much as possible by applying the above. That is, according to the present invention, a spiral groove having the same cross section as that of a flexible cooling tube made of a material having good thermal conductivity is bored in the outer peripheral portion of the stator, the cooling tube is wound around the groove, and the cooling tube is wound. While applying air pressure or liquid pressure to the extent that the inner tube wall expands and expands sufficiently, a thermoplastic resin that integrates the stator outer peripheral portion and the cooling pipe is provided between the mold dies surrounding the stator outer peripheral portion and the cooling pipe. It is a manufacturing method of a cooling device which performs resin molding.

[0005]

Since the present invention is the method for manufacturing such a cooling device, the contact area between the outer peripheral portion of the stator and the cooling pipe is maximum, and there is no contact gap between the two, and the Joule heat generated inside the stator is eliminated. Are efficiently discharged to the outside of the stator by the cooling pipe.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of a stator of a servomotor including a cooling pipe produced according to an embodiment of the present invention.
1 is a stator core formed by stacking thin electric steel sheets,
Reference numeral 2 is a coil wound around a stator for passing an armature current, and 3 is a cooling tube made of, for example, a flexible and thin metal having good thermal conductivity, and has a circular cross section in this example. 4 is a thermoplastic resin mold. In all the drawings, the same reference numerals indicate the same or corresponding members. FIG. 2 is a side view showing a state in which a groove for spirally winding a cooling pipe is formed on the outer peripheral surface of a stator according to an embodiment of the present invention. The outer peripheral surface is formed by forming a spiral groove having the same shape as the cooling pipe 3,
The coil ends of the coil 2 of the stator 1 can be seen on both end surfaces of the stator 1. FIG. 3 is a side view when a spiral cooling pipe is wound around the outer peripheral surface portion of the stator and wound around the outer peripheral groove of the stator according to the embodiment of the present invention. The present invention is a method for integrally molding the stator and the cooling pipe in such a state. That is, FIG. 4 is a side sectional view showing a method of manufacturing a cooling device according to an embodiment of the present invention. In FIG. 4, K _1a forms the lower mold and K _2a forms the upper mold. K _{1b, which} is a component of the lower mold K _1a , is a molding gate, K _1c is a cooling pipe insertion portion that forms an insertion hole for a cooling pipe together with K _2c , which will be described later, and K _1d positions the stator 1 on the lower mold K _1a . Bolt closing fixing means [mandrel]
Is. K _{2b, which} is a component of the upper mold K _2a , is a runner, K
_{Reference numeral 2c} is a cooling pipe insertion portion which forms an insertion hole for the cooling pipe together with _K1c . After passing through such a preparation step, an appropriate gas or liquid fluid pressure is applied from one end B of the cooling pipe 3. However, the other end of the cooling pipe 3 is sealed [not shown]. The cooling pipe 3 is, for example, a thin-film cylindrical metal pipe made of flexible copper or brass having good thermal conductivity. The cooling pipe 3 includes a stator 1 and a lower mold die K _1a.
It is sandwiched between the pipes, and fluid pressure such as air pressure and liquid pressure is applied from the inside of the pipe, and it has the same shape as the surface of the outer peripheral groove of the stator 1, and the contact surface is sufficiently taken, and the gap between the stator 1 and the cooling pipe 3 There is no. Next, the resin mold is put in from the portion A of the upper mold K _2a . The fluid pressure from the portion B is continuously applied until the impregnation with the resin is completed and the resin mold is solidified. If the resin mold is solidified, the lower mold K _1a ,
By disassembling the upper mold K _2a , the cooling tube is resin-molded to obtain the required stator.

[0007]

As described above, according to the present invention, a sufficient contact area between the stator and the cooling pipe can be obtained, a contact pressure can be applied from the outside without a gap between the stator and the cooling pipe, and the stator has a high cooling efficiency. It is possible to obtain a special effect that it is possible to obtain.

[Brief description of drawings]

FIG. 1 is a side sectional view of a stator according to an embodiment of the present invention.

FIG. 2 is a side view showing a state in which a groove for spirally winding a cooling pipe is engraved on an outer peripheral surface of a stator according to an embodiment of the present invention.

FIG. 3 is a side view of a stator in which a cooling pipe is spirally wound around an outer peripheral surface thereof in an embodiment of the present invention.

FIG. 4 is a side sectional view showing a form in which a stator is resin-molded in an embodiment of the present invention.

[Explanation of symbols]

1 Stator 2 Coil 3 Cooling pipe 4 Resin mold K _1a Lower mold K _1b Resin mold gate K _1c Cooling pipe insertion part K _1d Stator positioning mandrel K _2a Upper mold K _2b Runway K _2c Cooling pipe insertion part

Claims (1)

[Claims] 1. A spiral groove having the same cross section as that of a flexible cooling pipe made of a material having good thermal conductivity is formed in the outer peripheral portion of the stator, and the cooling pipe is wound around the groove, and the cooling pipe is The stator outer peripheral portion and the cooling pipe are integrated between the mold dies surrounding the stator outer peripheral portion and the cooling pipe while applying atmospheric pressure or liquid pressure to such an extent that the inner pipe wall is sufficiently expanded and expanded. A method for manufacturing a cooling device, which comprises molding a thermoplastic resin.