JP4200414B2 - Motor and motor cooling method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a motor using an air bearing as a bearing and a method for cooling such a motor.
[0002]
[Prior art]
A conventionally used absolute linear motor will be described with reference to FIG.
[0003]
FIG. 4 is an external perspective view showing a schematic configuration of a conventional absolute linear motor. In the figure, a slider 101 is composed of a slider member. The slider 101 is magnetically attracted to the platen 102 by a bias magnet (not shown) inside. An air tube 103 is connected to the slider 101. The slider 101 is connected to a motor driving wiring 104.
[0004]
In the above configuration, air is supplied between the slider 101 and the platen 102 by the air tube 103, thereby forming an air bearing between the slider 101 and the platen 102. When such an air bearing is formed, the slider 101 can move on the platen 102 without friction because the air pressure and the attractive force of the bias magnet are balanced.
[0005]
In the linear motor as described above, an electromagnet is formed by winding a copper wire around an iron core. Then, by controlling the current flowing through the copper wire, a force attracting each other is generated between the electromagnet and the iron portion on the platen 2 side, thereby driving the motor.
[0006]
By the way, when a current is passed through the copper wire, heat is generated by the resistance of the copper wire. In addition, eddy currents are generated in the iron core, which also generates heat. Further, when a motor driving circuit or the like is incorporated on the slider 1 side, heat is also generated by the motor driving circuit.
[0007]
[Problems to be solved by the invention]
As described above, heat is generated when the linear motor is driven by passing an electric current. If the heat generation is large, the slider 101 and the platen 102 may be deformed by heat, or the internal circuit may be damaged by heat. In addition, when a work is attached to such a linear motor, if the amount of heat generated is large, the attached work may be adversely affected.
[0008]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a motor and a motor cooling method capable of cooling the motor without providing a special device.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the motor according to the present invention can be configured as follows.
[0010]
(1) A movable slider, a platen for restricting the moving direction of the slider, an air supply means for supplying air into the slider, and provided between the slider and the platen, from the air supply means In a motor having an air flow passage that forms an air bearing by flowing supplied air, one of air flowing through the air flow passage from the air flow passage through the slider toward the upper surface of the slider. And a guide that covers an upper surface of the slider and regulates a direction in which the air flowing through the air circulation hole flows out.
[0011]
(2) The motor according to (1), wherein the slider is configured by combining two slider members, and the air circulation hole is provided between the two slider members.
[0012]
(3) The motor according to (1), wherein the guide covers an upper surface of the slider and forms an air circulation passage through which the air flowing through the air circulation hole flows along the slider.
[0013]
(4) The motor according to (1), wherein at least two of the air circulation holes are provided in the slider.
[0014]
(5) A movable slider, a platen for regulating the moving direction of the slider, an air supply means for supplying air into the slider, and provided between the slider and the platen, from the air supply means In a cooling method for a motor having an air flow passage that forms an air bearing by flowing supplied air, the air flow passage extends from the air flow passage through the slider toward the upper surface of the slider. A method for cooling a motor, wherein a part of the flowing air is flown and a direction in which the part of the air flows out is regulated around the slider on an upper surface of the slider .
[0015]
(6) The motor according to (5), wherein the slider is configured by combining two slider members, and a part of the air flowing through the air flow passage is caused to flow between the two slider members. Cooling method.
[0016]
(7) The motor cooling method according to (5), characterized in that an air circulation passage is formed in which air that has flowed from the air flow passage to the upper surface of the slider flows along the slider.
[0017]
With this configuration, the air supplied for the air bearing of the linear motor can flow around the motor, so that the motor can be cooled without providing a special device.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a motor and a motor cooling method of the present invention will be described with reference to FIGS.
[0019]
1 is an external perspective view showing a schematic configuration of a motor according to the present embodiment, FIG. 2 is a partial cross-sectional view showing a cross section of a slider constituting the motor shown in FIG. 1, and FIG. It is sectional drawing of the shown motor. These figures show examples of linear motors.
[0020]
As shown in each figure, the linear motor is mainly composed of a slider 1 and a platen 2, and a guide 7 is provided on the top of the slider 1 to form an air circulation passage for cooling an outer portion of the slider member. It has a structure.
[0021]
An upper surface (hereinafter referred to as “air bearing surface 6”) of the platen 2 facing the slider 1 is formed in a mountain shape by two surfaces adjacent to each other at right angles. The slider 1 is configured as a V-shaped slider that sandwiches the air bearing surface 6. By configuring the slider 1 as such a V-shaped slider, the movement of the slider 1 relative to the platen 2 is limited in the direction of arrow A shown in FIG. The slider 1 is magnetically attracted to the platen 2 by a bias magnet (not shown) inside the slider 1.
[0022]
The slider 1 is configured by combining a pair of slider members 1a and 1b. Inside each slider member 1a and 1b, an air supply hole 8 for receiving supply of air from an air tube (not shown) and a motor core (not shown) are provided. When air is supplied to the air supply hole 8 from the air tube, the air is supplied between the slider 1 and the air bearing surface 6 of the platen 2 as shown in FIG. 3, and the air flow passage 6a constituting the air bearing is provided. Is formed. When the air bearing is formed between the slider 1 and the platen 2 in this manner, the slider 1 is highly rigid and has no friction on the platen 2 because the air pressure and the attractive force of the bias magnet are balanced. It becomes possible to move.
[0023]
Between the slider member 1 a and the slider member 1 b, that is, at the deepest portion of the V-shape of the slider 1, the slider 1 extends from the portion in contact with the air bearing surface 6 of the platen 2 toward the surface opposite to the air bearing of the slider 1. The air circulation hole 5 is provided so as to pass through. Although the three air circulation holes 5 are provided in the example shown in FIGS. 1 and 2, it goes without saying that the number of the air circulation holes 5 is not limited to this.
[0024]
A guide 7 is provided above the slider 1 so as to cover the upper surface of the slider 1. The shape of the guide 7 corresponds to the shape of the upper surface of the slider 1. As will be described later, the guide 7 forms an air circulation passage 9 that regulates the flow direction of the air flowing out from the air circulation hole 5.
[0025]
3 shows a state in which the slider 1 and the platen 2 are cut at a position of the air circulation hole 5 of the slider 1 in a cross section perpendicular to the direction of the arrow A in FIG.
[0026]
In the above configuration, the air supplied from the air tube is supplied between the air bearing surface 6 and the slider 1 through the air supply hole 8. The supplied air flows through the air bearing surface 6 and then flows out of the motor from the first air outflow portion 10. A part of the supplied air flows through the air bearing surface 6 and then flows out to the upper surface of the slider 1 through the air circulation hole 5. A guide 7 is provided above the air circulation hole 5. Therefore, the air flows along the upper surface of the slider 1, that is, through the air circulation passage 9, and flows out from the second air outflow portion 11.
[0027]
In this way, a part of the air supplied from the air supply hole 8 to the air bearing surface 6 passes through the air circulation hole 5 and the air circulation passage 9 and circulates around the slider members 1a and 1b to form the second air. It flows from the outflow part 11 to the outside. The supplied air is normal temperature, and this air flows so as to surround each slider member 1a and 1b. Therefore, the heat generated from the slider members 1a and 1b is taken away, thereby cooling the slider members 1a and 1b as a cooling medium. Function.
[0028]
As described above, according to the present embodiment, the air supplied to form the air bearing is used as a cooling medium, and the air circulation hole 5 and the air flow so that the air flows around the slider members 1a and 1b. Since the air circulation passage 9 is formed, the slider members 1a and 1b can be cooled without using an additional cooling device.
In the present embodiment, an example of a linear motor has been described.
[0029]
Further, since the thermal expansion of the slider 1 and the platen 2 due to the heat generated by the linear pulse motor can be suppressed, the mechanical accuracy of the motor can be maintained.
[0030]
Furthermore, it is possible to suppress the influence of the heat generated by the motor on the work to be mounted as small as possible.
【The invention's effect】
[0031]
As described above, according to the present invention, since the air supplied for the motor air bearing can be flowed around the motor, the motor can be cooled without providing a special device. The effect of becoming is obtained.
[Brief description of the drawings]
FIG. 1 is an external perspective view showing a schematic configuration of a linear motor according to an embodiment of the present invention.
2 is a partial cross-sectional view showing a cross section of a slider constituting the linear motor shown in FIG. 1. FIG.
3 is a cross-sectional view of the linear motor shown in FIG.
FIG. 4 is an external perspective view showing a schematic configuration of a conventional absolute linear motor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Slider 1a, 1b Slider member 2 Platen 5 Air circulation hole 6 Air bearing surface 6a Air flow path 7 Guide 8 Air supply hole 9 Air supply path 10 1st air outflow part 11 2nd air outflow part

Claims (7)

A movable slider, a platen for regulating the moving direction of the slider, an air supply means for supplying air into the slider, and provided between the slider and the platen, and supplied from the air supply means In a motor having an air flow passage that forms an air bearing by flowing air,
An air circulation hole through which a part of the air flowing through the air flow passage flows from the air flow passage to the upper surface of the slider through the slider;
A motor that covers an upper surface of the slider and regulates a direction in which the air flowing through the air circulation hole flows out.   The motor according to claim 1, wherein the slider is configured by combining two slider members, and the air circulation hole is provided between the two slider members.   2. The motor according to claim 1, wherein the guide forms an air circulation passage that covers an upper surface of the slider and allows the air flowing through the air circulation hole to flow along the slider. 3.   The motor according to claim 1, wherein at least two of the air circulation holes are provided in the slider. A movable slider, a platen for regulating the moving direction of the slider, an air supply means for supplying air into the slider, and provided between the slider and the platen, and supplied from the air supply means In a method for cooling a motor having an air flow passage that forms an air bearing by flowing air,
A portion of the air flowing through the air flow passage is passed from the air flow passage through the slider toward the upper surface of the slider;
A method for cooling a motor, wherein a direction in which a part of the air flows out is regulated around the slider on an upper surface of the slider .   6. The motor cooling method according to claim 5, wherein the slider is configured by combining two slider members, and a part of the air flowing through the air flow passage is caused to flow between the two slider members. . 6. The motor cooling method according to claim 5 , wherein an air circulation passage is formed in which air flowing from the air flow passage to the upper surface of the slider flows along the slider.

Images