JP2002112524A - Movable coil for linear motor, and motor having movable coil of multilayer construction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance heat radiating effect of the movable coil of a linear motor. SOLUTION: The movable coil 1 is made up of a multilayered board 14 of four layers, and a plurality of coils 13 among of spiral conductor patterns are formed in parallel on each layer. The coils 13 of each layer and electrically connected through insulating layers 12 through the use of through-holes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a motor having a moving coil of a linear motor and a moving coil having a multilayer structure.

[0002]

2. Description of the Related Art In a linear motor, for example, a plurality of coils wound in a flat shape are arranged in parallel on a movable side, and permanent magnets are arranged in parallel on a fixed side with a predetermined interval from the coil. It is designed to perform a linear motion by supplying an alternating current to the.

As an example of the structure of the movable side coil, for example, Japanese Patent Application Laid-Open No. 2000-92812 discloses a structure in which coils formed by winding a wire in a flat shape are arranged in parallel on a base plate. I have.

According to the present invention, in order to enhance the heat radiation effect of the coil, a central portion of a base plate on which the coil is mounted is cut off.

[0005]

However, in the above invention, since the coil is formed by winding the wire, it is difficult to dissipate the heat generated inside the winding when an electric current is applied, and the temperature of the coil rises. It was necessary to limit the current flowing through the coil in order to suppress the noise.

[0006] The coil wound with a wire is heavy,
There is also a problem that the efficiency of the motor is reduced accordingly.
An object of the present invention is to enhance the heat radiation effect of a moving coil of a linear motor. Another object is to reduce the weight of the moving coil of the motor.

[0007]

According to a first aspect of the present invention, there is provided a movable coil for a linear motor, comprising: a conductor layer on which a coil formed of a wound conductor pattern is formed;
The coils of the plurality of conductor layers are configured to be electrically connected.

According to the present invention, since the heat is radiated from the coils formed on the respective conductor layers, the heat radiation area of the coils is increased, and the heat generated in the coils can be efficiently dissipated. Also, by increasing the heat dissipation efficiency,
Since the allowable current density of the conductor pattern can be increased, the amount of copper used for the movable coil can be reduced. This makes it possible to reduce the weight of the movable coil and improve the efficiency of the linear motor.

Further, since the movable coil can be manufactured by the manufacturing process of the multilayer substrate, the manufacturing process can be simplified as compared with the conventional manufacturing method in which the coil wound flat is fixed to the mounting plate.

In the above invention, the inner peripheral ends of the coils of the uppermost layer and the lowermost layer, or the inner peripheral ends of the coils of the uppermost layer and the intermediate layer, and the coils of the lowermost layer and the intermediate layer, are composed of an even number of conductor layers. The parts may be electrically connected via an insulating layer.

With such a configuration, a coil having a desired number of turns can be realized by electrically connecting the inner peripheral ends of the coils of the plurality of conductor layers. In the above invention,
At least four or more conductor layers are formed, and the inner peripheral ends of the uppermost layer, the intermediate layer, and the lowermost layer are electrically connected to each other through the insulating layer. The outer peripheral end may be connected to an external input or the outer peripheral end of another coil formed on the same substrate.

With such a configuration, the coils formed on the same substrate can be connected on the same substrate. A motor according to a sixth aspect of the present invention includes at least three or more conductor layers on which a coil made of a wound conductor pattern is formed, and at least two or more insulating layers,
A movable coil having a multilayer structure in which coils of a plurality of conductor layers are electrically connected via an insulating layer.

According to the present invention, since the movable coil has a multilayer structure, the heat radiation area of the conductor pattern can be increased.
The heating effect of the movable coil can be enhanced. In addition, the moving coil can be reduced in weight by using a multilayer substrate, thereby improving the efficiency of the motor.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating a structure of a movable coil 11 of the linear motor according to the first embodiment.

The movable coil 11 comprises a multilayer substrate 14 having a printed coil 13 formed by etching on an insulating layer 12 of glass epoxy or the like. Print coil 1
Reference numeral 3 denotes a pattern in which a spiral pattern is formed.
2 are formed in parallel.

The movable coil 11 has four conductive layers and five insulating layers including the uppermost resist layer. The printed coil 13 is formed on the first to fourth insulating layers 12. ing.

FIG. 2 is an explanatory diagram of a method of connecting layers of the movable coil 11 having a multilayer structure. For example, if the linear motor is a three-phase AC motor, the outer peripheral end 21 of the printed coil 13 formed of the wound conductor pattern of the first layer (uppermost layer) is electrically connected to other printed coils 13 of the same phase. And a through hole 23 is formed in the inner peripheral end 22 thereof.

A through hole 25 is formed at the inner peripheral end 24 of the spiral print coil 13 of the second layer (intermediate layer), and a through hole 27 is also formed at the outer peripheral end 26. The through-hole 25 of the inner peripheral end 24 of the second-layer print coil 13 penetrates the insulating layer 12 between the first layer and the second layer to form the inner peripheral end 22 of the first-layer print coil 13. It is electrically connected to the through hole 23. Thereby, the print coil 13 of the second layer and the print coil 13 of the first layer are connected in series.

A through hole 29 is formed at the outer peripheral end 28 of the spiral print coil 13 of the third layer, and a through hole 31 is formed at the inner peripheral end 30. The through hole 29 in the outer peripheral end portion 28 of the third layer penetrates the insulating layer 12 between the third layer and the second layer and passes through the through hole 27 of the second layer.
Is electrically connected to The through hole 31 of the third layer is insulated from the through hole 25 of the second layer and the printed coil of the second layer.

As a result, the third-layer printed coil 13
And the print coil 13 of the second layer are connected in series. A through hole 33 is formed in the inner peripheral end 32 of the spiral printed coil 13 of the fourth layer. The through hole 33 penetrates through the insulating layer 12 between the fourth layer and the third layer and is electrically connected to the through hole 31 at the inner peripheral end 30 of the third layer. Thereby, the printed coil 1 of the fourth layer
The third and third-layer print coils 13 are connected in series.

Print coil 13 of fourth layer (lowest layer)
Is connected to another printed coil 13 formed on the same substrate. That is, the inner peripheral end 22 of the first-layer print coil 13 is connected to the inner peripheral end 24 of the second-layer print coil 13, and the outer peripheral end 26 of the second-layer print coil 13 is connected to the third-layer print coil 13. Printed coil 1
3 and the inner peripheral end 30 of the third layer is connected to the inner peripheral end 32 of the printed coil 13 of the fourth layer, so that a total of four printed coils 13 are connected in series. Connected.

Therefore, the printed coil 13 per layer
Is n, the total number of turns of the movable coil 11 in the case of four layers is 4n, and a desired number of turns can be obtained by increasing the number of layers.

Next, FIG. 3 is an explanatory diagram of a method of connecting printed coils when a three-phase AC motor is used as a linear motor. A plurality of printed coils 41, 49, 61,... Are formed in parallel on the multilayer substrate 14, and the printed coils 41, 49, 61,. , 61 ... in order
A three-phase alternating current of a phase, a V phase, and a W phase is supplied.

In FIG. 3, the solid arrows indicate the first-layer conductive patterns for connecting the print coils, and the broken-line arrows indicate the fourth-layer conductive patterns. First, connection of the U-phase print coil will be described. The outer peripheral end 42 of the U-phase first layer print coil 41 is connected to another U-phase print coil formed on the same substrate, or a three-phase AC U-phase current is supplied from outside. . The outer peripheral end 43 of the fourth-layer print coil 41 is connected to the next U-phase fourth coil.
It is connected to the outer peripheral end 45 of the printed coil 44 of the layer by a conductor pattern. Further, the outer peripheral end 46 of the U-phase first layer print coil 44 is connected to the outer peripheral end 48 of the next U-phase first layer print coil 47.

Accordingly, the U-phase first layer printed coil 4
The U-phase current supplied to the outer peripheral end 42 of the first print coil 41 flows through the through-hole at the inner peripheral end to the printed coil 41 of the second layer, and passes through the through-hole at the outer peripheral end of the printed coil 41 of the second layer. After that, it flows to the print coil 41 of the third layer. Further, it flows through the through-hole at the inner peripheral end of the third-layer print coil 41 to the fourth-layer print coil 41, and from the outer peripheral end 43 of the fourth-layer print coil 41 to the fourth U-layer fourth coil. It flows to the printed coil 44 of the layer. The current flowing into the fourth-layer print coil 44 passes through the third-layer, second-layer, and first-layer print coils 44, and the outer peripheral end 4 of the first layer.
6 flows to the next U-phase first layer print coil 47.

Next, the V-phase fourth layer print coil 49
Is supplied with a V-phase current of three-phase alternating current from another printed coil formed on the same substrate or from the outside. The outer peripheral end portion 51 of the V-phase first layer print coil 49 is connected to the next outer peripheral end portion 53 of the V-phase first layer print coil 52 by a conductor pattern. In addition,
Since this conductor pattern intersects with the above-described U-phase conductor pattern, a part thereof is connected by a third-layer conductor pattern via the through hole 54. The outer peripheral end 55 of the V-phase fourth layer print coil 52 is connected to the next outer peripheral end 57 of the V-phase fourth layer print 56 by a conductor pattern. The V-phase first layer print coil 56
Are connected to the outer peripheral end 60 of the U-phase fourth-layer print coil 47 and the outer peripheral end 69 of the W-layer fourth layer print coil 67 via a through hole 59 by a conductor pattern. Have been.

Therefore, the V-phase fourth layer printed coil 4
The current supplied to the outer peripheral end 50 of the third layer 9 passes through the through-hole at the inner peripheral end (not shown) of the printed coil 4 of the third layer.
9 through the through-hole at the outer peripheral end of the third-layer print coil 49, and flows to the second-layer print coil 49. Further, it flows through the through-hole at the inner peripheral end of the second-layer print coil 49 to the first-layer print coil 49, and from the outer peripheral end 51 of the first-layer print coil 49 to the next V-phase first layer. To the print coil 52. This V
The current flowing into the print coil 52 of the phase passes through the print coil 52 of the second layer, the third layer, and the fourth layer, from the outer peripheral end portion 55 of the print coil 52 of the fourth layer, to the next layer of the V phase of the fourth layer. It flows to the print coil 56.

Next, the W-phase first layer print coil 61
Is connected to another printed coil formed on the same substrate, or a three-phase AC W
Phase current is supplied. This first layer print coil 6
Reference numeral 1 is connected in series with the second, third and fourth layers of the printed coil 61 via through holes.

Outer end 6 of fourth-layer printed coil 61
3 is connected to the outer peripheral end 65 of the next W-phase fourth layer print coil 64 by a conductor pattern. further,
The outer peripheral end 66 of the W-phase first layer print coil 64 and the outer peripheral end 68 of the next W-phase first layer print coil 67 are connected by a conductor pattern. The first of the W phase
The outer peripheral end 69 of the printed coil 67 of the layer is a U-phase fourth coil.
Outer edge 60 of the layered print coil 47 and the V-phase fourth
It is connected to the outer peripheral end 58 of the phase print coil 56 by a conductor pattern.

Therefore, the printed coil 6 of the first layer of the W layer
The current supplied to 1 flows through the printed coils 61 of the second, third and fourth layers. Then, it flows from the outer peripheral end 61 of the fourth layer print coil 61 to the next W layer fourth layer print coil 64.

According to the above-described embodiment, since the movable coil 11 of the linear motor is formed of a multilayer printed circuit board, the surface area of the conductor pattern serving as a current path is approximately twice as large as that of a conventional copper winding. Or more.
Thereby, the heat radiation efficiency of the conductor pattern of the current path can be increased, so that the current can flow at a current density approximately five times that of the copper winding. Furthermore, since the current density can be increased, the amount of copper used can be reduced, and the weight of the movable coil 11 can be reduced.

FIGS. 4A and 4B show a movable coil 7 on the rotor side of a rotary motor according to a second embodiment of the present invention.
1 is a sectional view of a plane and a main part of FIG. As shown in FIG. 4B, the movable coil 71 according to the second embodiment is formed of a multilayer printed board including four insulating layers 73 and conductive layers including printed coils 72b and 76a. One conductor layer is covered with a resist. A rotating shaft 91 is fixed to the center of the movable coil 71 by press-fitting, bonding, or another mechanical fixing method.

As shown in FIG. 4A, in each layer, two printed coils through which three-phase AC U-phase, V-phase, and W-phase currents flow are formed by etching or the like. The two U-phase print coils 72a and 72b of the first layer are:
The printed coil 72a and the printed coil 72b are formed on the first insulating layer 73, and
Are connected in series.

The two printed coils 72a, 72b are:
The respective inner peripheral ends are connected to the inner peripheral ends of the second-layer print coils 72a and 72b via through holes 74a and 74b. Further, the outer peripheral ends of the print coils 72a and 72b of the second layer are connected to the third ends via the through holes.
The outer peripheral ends of the third-layer print coils 72a and 72b are connected to the outer peripheral ends of the third-layer print coils 72a and 72b, and the inner peripheral ends of the third-layer print coils 72a and 72b are connected to the fourth-layer print coils 72 through through holes.
a, 72b.

Accordingly, the U-phase current supplied to the outer peripheral terminal 80 of the printed coil 72a of the fourth layer is equal to the current of the third layer and the second layer.
Flow through the first layer print coil 72a, through the conductor pattern 75, to the first layer print coil 72b,
Further, the printed coils 7 of the second, third and fourth layers
2b.

As for the V-phase, the first to fourth-layer print coils 76a and 76b are connected in series by through holes, and the first-layer V-phase two print coils 76a and 76b are connected.
6b are connected in series by through holes 77a, 77b and a conductor pattern of the second layer (shown by a broken line in FIG. 4). A V-phase current of three-phase AC is supplied to the outer peripheral end of the V-phase print coil 76a in the fourth layer.

Therefore, the U-phase current supplied to the outer peripheral terminal 81 of the printed coil 76a of the fourth layer is equal to the current of the third layer and the second layer.
It flows through the first and second layers of the printed coil 76a, passes through the second layer of the conductor pattern, and flows into the first layer of the printed coil 76b. Furthermore, it flows to the printed coil 76b of the second, third and fourth layers.

Each of the W-phase print coils 78a, 78
b are connected in series by through holes, and the first-layer W-phase print coils 78a and 78b are connected to the first-layer conductor pattern, the through-holes 79a and 79b, and the second-layer conductor pattern (see FIG. 4). (Indicated by a broken line). Also, the fourth-layer W-phase print coil 78
The W-phase current of the three-phase AC is supplied to the outer peripheral end of “a”.

Further, the outer peripheral ends of the fourth, U-layer, V-layer, and W-layer print coils 72b, 76b, 78b are connected to each other by a conductor pattern. According to the second embodiment, since the moving coil of the rotary motor can be constituted by a multilayer printed circuit board, it is possible to reduce the size and weight as compared with a wound rotor, thereby improving the efficiency of the motor. I can do it. Further, since the production of the movable coil can be performed by the production process of the multilayer substrate, the production cost can be reduced by automation.

In the first embodiment described above, the number of conductor layers is even (for example, four layers), and the outer peripheral ends of the plurality of print coils are formed by the conductor pattern on the same surface as the surface on which the print coils are formed. Although the connection can be made, if the conductor pattern can be drawn out from the inner peripheral end of the printed coil using a through hole or the like, the number of conductor layers can be odd.

The multilayer substrate is not limited to the glass epoxy substrate of the embodiment, and other materials such as plastic and ceramic can be used. The method of manufacturing the multilayer substrate is not limited to a method of forming a conductor pattern by etching, but may be a method of forming a conductor pattern by electroplating, chemical plating, or the like, or a method of forming a conductor pattern by vapor deposition.

Furthermore, the method of connecting the upper and lower conductor layers via the insulating layer is not limited to the method using a through hole, and a via in which the through hole of the insulating layer is filled by electrolytic plating or the like may be used. May be electrically connected by the above method.

In the above embodiment, the case where the movable coil is constituted by one multilayer substrate has been described.
Print coils may be formed on a plurality of multilayer boards, respectively, and the plurality of multilayer boards may be integrally fixed to a mounting plate to function as one movable coil as a whole. When the outer dimensions of the movable coil are large, the cost of the multilayer substrate can be suppressed by using a multilayer substrate of a general-purpose size.

[0044]

According to the present invention, the heat radiating area of the conductor pattern through which a current flows can be increased and the heat radiating effect can be enhanced as compared with the conventional movable coil in which wires are wound in a wrapped manner. Further, by increasing the heat dissipation effect, the allowable current density of the conductor pattern can be increased, so that the amount of copper used for the movable coil to obtain a desired motor output can be reduced. This makes it possible to reduce the weight of the movable coil and improve the efficiency of the motor. Further, since the production of the movable coil can be performed in the production process of the multilayer substrate, the production cost can be reduced by automation. Further, by connecting the inner peripheral ends of the coils of the uppermost layer and the lowermost layer via an insulating layer or via an intermediate conductor layer and an insulating layer, the outer peripheral ends of the coils of the uppermost layer and the lowermost layer are connected. The part can be directly connected to the outer peripheral end of another coil. Thus, the connection between the coil and the external input or the connection between the coils formed of the conductor pattern can be performed on the same surface as the surface on which the coil is formed, and the number of through holes for connecting the coil can be reduced. And the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a structure of a movable coil according to a first embodiment.

FIG. 2 is an explanatory diagram of a method of connecting movable coils between layers.

FIG. 3 is an explanatory diagram of a method of connecting a print coil of a three-phase AC linear motor.

FIG. 4A is a plan view of a movable coil according to a second embodiment, and FIG. 4B is a cross-sectional view thereof.

[Explanation of symbols]

 Reference Signs List 11 movable coil 12 insulating layer 13 print coil 14 multilayer substrate 71 movable coil 72a, 72b U-phase print coil 76a, 76b V-phase print coil 78a, 78b W-phase print coil

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H603 AA11 BB07 BB09 BB14 BB15 CA02 CA05 CB01 CB13 CB24 CB26 CC14 CC19 CD04 CD25 FA13 FA24 5H641 BB18 GG03 GG05 GG07 GG11 GG12

Claims (5)

[Claims] A moving coil for a linear motor, comprising: a conductor layer on which a coil formed of a wound conductor pattern is formed; and an insulating layer, and the coils of the plurality of conductor layers are electrically connected. . 2. An even number of conductor layers, wherein the inner peripheral ends of the coils of the uppermost layer and the lowermost layer or the inner peripheral ends of the coils of the uppermost layer, the lowermost layer and the intermediate layer are interposed with an insulating layer. The movable coil of a linear motor according to claim 1, wherein the movable coil is electrically connected to the movable coil. 3. A coil comprising at least four or more conductor layers, wherein innermost ends of coils of the uppermost layer, the intermediate layer and the lowermost layer are electrically connected via an insulating layer, respectively. 3. The movable coil of a linear motor according to claim 1, wherein an outer peripheral end of the lower-layer coil can be connected to an external input or another coil formed on the same substrate. 4. A moving coil for a linear motor according to claim 1, wherein a plurality of said coils are formed in parallel on the same substrate. 5. A coil comprising at least three or more conductor layers on which a coil of a wound conductor pattern is formed, and at least two or more insulating layers, wherein the coils of the plurality of conductor layers are interposed via the insulating layer. A motor having a moving coil having a multilayer structure that is electrically connected.