JP2016034193A - Liquid cooling structure thin type coreless linear motor of piping sandwich type - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device having high cooling efficiency, having no risk of liquid leakage, having no increase of coil thickness in cooling of a coreless linear motor coil.SOLUTION: A sandwich structure in which a coil winding is divided into two pieces in a thickness direction between which a coolant pipe is inserted makes it possible to efficiently cool down a center of a coil. The coolant pipe is an elliptical pipe formed by compressing to deform in a coil thickness direction a pipe of a circular cross-section bent into a shape of a piping root in advance. For a pipe material, nonmagnetism austenite stainless steel is used. The coolant pipe of no joint is bent to form a flow passageway.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for effectively and compactly cooling an electromagnetic winding coil (hereinafter referred to as a coil) of a coreless linear motor with a liquid.

In general, as a liquid cooling method for a coreless linear motor, a method of indirectly cooling a coil by providing a flow path in a metal frame that supports the coil is employed.
However, since the cooling efficiency is low, there is a demand for a method of effectively cooling by providing a flow path near the coil.

This is a liquid cooling method for effectively and compactly cooling a coil unit of a synchronous coreless linear motor that generates thrust in combination with a permanent magnet.

When a coreless linear motor requires a large rated thrust or when it is desired to minimize the thermal influence on the surrounding environment, the heat generation of the coil must be kept low.
In view of this, a structure is provided in which the coil can be effectively cooled by passing a coolant in the vicinity of the coil, which is a heat generation source.

In the present invention, the coil winding is divided into two in the thickness direction, and a sandwich structure is provided in which a pipe serving as a coolant flow path is arranged.
At the same time, the cross-sectional shape of the metal pipe, which is the sandwiched coolant flow path, is compression-molded into a circular to ellipse shape, thereby minimizing the increase in dimension in the thickness direction of the motor.

The present invention efficiently cools the central portion of the coil winding, which is a heat source, by dividing the coil winding into two in the thickness direction and passing through the piping that serves as a coolant flow path therethrough. Made it possible.
The decrease in motor performance and motor efficiency can be reduced because there is little increase in dimension in the motor thickness direction.
The coolant flow path is made by bending a single metal tube, eliminating the risk of coolant leakage inside the motor.

FIG. 1 is a view showing a method of arranging a cooling liquid pipe. Example 1 FIG. 2 is a view three-dimensionally showing the shape and structure of the coil, the coolant pipe, the metal frame, the wiring, and the mold resin. (Example 2)

The coil winding is divided into two in the thickness direction, and a coolant pipe that is bent into a flow path shape and crushes the cross section of the pipe is sandwiched there.
The coil, the coolant pipe, and the wiring are integrated with the metal frame by a resin mold.

Claims (7)

  The coil winding is divided into two in the thickness direction, and a pipe serving as a flow path for the coolant is passed therethrough, thereby effectively cooling the coil central portion which is a heat source and difficult to cool. In order to suppress the increase in dimension in the thickness direction and expand the heat transfer area to the coil surface, the coolant pipe has an elliptical shape in which a circular cross-section pipe bent in advance to the shape of the piping route is compressed and deformed in the coil thickness direction. Mold.
By making the pipe cross section elliptical, it is possible to reduce the increase in the thickness of the coil portion. For the piping material, nonmagnetic austenitic stainless steel is used to reduce the effect on corrosion resistance and motor electromagnetic field. By forming a flow path by molding a single seamless pipe, it is possible to prevent leakage of the cooling liquid inside the resin-molded coil as much as possible. Fixing the coolant piping with resin that molds the coil eliminates the need for piping fixing parts.
In addition, the rigidity of the coil unit is improved by using the piping as a resin reinforcing material. Improving the rated thrust and eliminating the influence of heat on the surroundings by arranging the coolant piping in the immediate vicinity of the coil and efficiently reducing the heat generation of the coil,
In addition, the mechanical displacement due to heat can be reduced as much as possible. In the method of providing a flow path in the metal frame and indirectly cooling the coil, the depth of the flow path is processed by gun drilling, but the metal frame length is limited.
There is no limitation on the length of the metal frame in the system in which the flow path is formed by bending a metal tube.