JPH07255163A - Method of fixing armature coil of linear motor - Google Patents

Abstract

PURPOSE:To prevent a coil end portion from swelling to a thickness greater than that of the linear portion by inserting the coil end portion to a drafting hole extending to the range larger than the coil end portion of a unit coil provided near both end portions of an intermediate plate. CONSTITUTION:Two unit coils 2, 3 are bonded to both ends of an intermediate plate 5 extending in the direction of the movement. Drafting holes 51, 52 extending to the range larger than the coil end portions 12, 13 of the unit coils 2, 3 are provided near both end portions of the intermediate plate 5. The linear portions 11 of the unit coils 2, 3 are bonded directly to respective intermediate plate 5, the coil end portions 12, 13 are inserted into the drafting holes 51, 52 and these are bonded to the coil end portions provided opposed to each other. Therefore, since the coil end portions 12, 13 do not sandwich the intermediate plate 5, the coil end portion is prevented from swelling to a thickness greater than that of the linear portion 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for fixing an armature winding of a linear motor for driving a linear movement device which requires highly accurate positioning.

[0002]

2. Description of the Related Art Conventionally, a linear motor is generally provided with an armature facing a field magnet, which is a flat plate-shaped permanent magnet, with an air gap therebetween. However, a three-phase armature winding is fixed to the armature. In this case, a plurality of element coils are helically wound around an insulating sheet to form a smooth strip-shaped coil, and the strip-shaped coil is fixed on both sides of a flat plate-shaped intermediate plate made of a non-magnetic material, and the coil end is used to It is disclosed that the strip-shaped coils on both sides are connected together with a lead wire connected to the power source from the coil end (for example,
JP-A-5-184093, JP-A-3-45157
issue).

[0003]

However, in the prior art, the intermediate portion of the strip-shaped coil has two layers of conductor portions. However, as shown in the plan sectional view of the armature A shown in FIG. In the portion B, a folded portion of the strip-shaped coil C and a lead-out portion D connected to the lead-out wire are overlapped in three layers, and when the strip-shaped coil C is bonded to the flat intermediate plate E, the thickness of the coil end portion B is increased. Thickness F becomes thicker. Therefore, in order to prevent the coil end portion B from coming into contact with the field magnet, it is necessary to increase the gap between the armature winding and the field magnet, so that the thrust of the linear motor decreases. In addition, there is a drawback that the heat loss of the armature increases when the required thrust is generated. An object of the present invention is to prevent the coil end from protruding from the intermediate plate, maintain a small air gap length, and prevent a decrease in thrust and an increase in heat loss of the armature.

[0004]

In order to solve the above problems, the present invention forms an armature winding by fixing unit coils composed of a plurality of element coils on both sides of a flat plate-shaped intermediate plate extending in the moving direction. In the armature winding fixing method for a linear motor, a hole is provided in a portion of the intermediate plate corresponding to the coil end portion of the unit coil, and the coil end portions of the unit coils on both sides are inserted into the hole. The ends of the lead-out leads that are pulled out from the coil end portion in parallel with the unit coil and have the same shape on the same plane, and are formed in the longitudinal direction of the armature from the coil end portion. This is a method of fixing the armature winding so that the armature winding is made to project toward.

[0005]

With the above-mentioned means, the coil end portion is inserted into the punched hole which is provided in the vicinity of both ends of the intermediate plate and is wider than the coil end portion of the unit coil, so that the coil end portion swells more than the thickness of the straight portion. There is no. In addition, the ends of the lead wires are formed in parallel with the unit coil and have the same shape on the same plane, and the ends of the leads are projected and pulled out from the insulating sheet in the longitudinal direction of the armature. The connecting portion of the output lead is formed on the same plane as the linear portion of the element coil, and the coil end portion does not become thick. Therefore, the gap between the armature winding and the field magnet can be kept small.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a front view showing an armature according to an embodiment of the present invention, FIG. 2 is a front view of an armature winding, FIG. 3 is a front view of an intermediate plate, and FIG. 4 is a plan sectional view of an armature. In FIG. 2, the armature winding 1 forms a closed circuit by connecting a plurality of element coils including a straight portion 11 formed in the middle, coil end portions 12 and 13 formed at both ends, and a lead lead-out portion 14. It is composed of two formed unit coils 2 and 3. That is,
The one unit coil 2 is formed by fixing the element coil 21 and the element coil 22 to both sides of the rectangular insulating sheet 4 by adhesion and connecting both edges of the element coil 21 and the element coil 22 to each other, and the other unit coil 2 is formed. Similarly, the coil 3 is formed by fixing the element coil 31 and the element coil 32 to both sides of the rectangular insulating sheet 4 by adhesion and connecting both edges. Therefore, the element coil is formed in four layers. The lead lead-out portion 14 has six lead-out leads U, Z, V, from each element coil.
X, W, and Y are projected from the insulating sheet 4 from one coil end portion 12 in the longitudinal direction of the armature, that is, in the moving direction, and pulled out to align the positions of the ends of the lead leads for each element coil. The two unit coils 2 and 3 are
As shown in FIG. 1, the intermediate plate 5 extending in the moving direction is fixed to both sides by adhesion. As shown in FIG. 3, holes 51 and 52 are formed near both ends of the intermediate plate 5 so as to extend over a larger area than the coil end portions 12 and 13 of the unit coils 2 and 3, respectively. Unit coil 2,
The straight portions 11 of 3 are directly bonded to the intermediate plate 5, the coil end portions 12 and 13 are inserted into the holes 51 and 52, and fixed to the opposing coil end portions by bonding. Therefore, as shown in FIG. 4, since the coil end portions 12 and 13 do not sandwich the intermediate plate 5, they do not bulge more than the thickness of the linear portion 11.

Lead-out leads U of the lead-out portion 14,
The arrangement of Z, V, X, W and Y is shown in FIGS. That is, the element coil 21 is shown in FIG. 5A, the element coil 22 is shown in FIG. 5B, the element coil 31 is shown in FIG. 5C, and the element coil 32 is shown in FIG. 5D. Each lead wire is formed in parallel with the element coil and on the same plane so that the lead wires overlap each other when the element coils are superposed on each other.
When connecting the three-phase armature winding 1,
As shown in, the lead wires U, Z, and
Connect to the lead 6 for pulling V out,
W, Y are connected to U, Z, V of the element coil 22, and X, W, Y of the element coil 22 are connected to U, Z,
Connected to V, X, W and Y of the element coil 31 are connected to U, Z and V of the element coil 32, and X, W and Y of the element coil 31 are connected to the extraction lead 7 for drawing to the outside, The two unit coils 2 and 3 are connected in series. In this way, the ends of the lead wires are formed to have the same shape, and the lead wires are connected to the coil ends so as to project from the insulating sheet toward the longitudinal direction of the armature. It is formed on the same plane as the linear portion of the element coil, and the coil end portion does not become thick.
In addition, although the said Example demonstrated the example which connected two unit coils in series, you may connect two unit coils in parallel and may form an armature winding with low induced voltage.

[0008]

As described above, according to the present invention, a hole is formed in the intermediate plate, the coil end portions are put in the hole and fixed to each other, and the element coils forming the unit coil are connected to each other. Is on the same plane as the element coil,
Moreover, since it is performed at the end portion of the unit coil, the coil end portion does not become thick and does not swell from the straight portion of the coil end portion. Therefore, it is possible to maintain a small air gap between the armature winding including a plurality of unit coils and the field magnet, and it is possible to prevent a decrease in thrust and an increase in heat loss of the armature.

[Brief description of drawings]

FIG. 1 is a front view showing an armature according to an embodiment of the present invention.

FIG. 2 is a front view showing an armature winding according to an embodiment of the present invention.

FIG. 3 is a front view showing the intermediate plate according to the embodiment of the present invention.

FIG. 4 is a plan sectional view of an armature according to an embodiment of the present invention.

FIG. 5 is a front view showing the vicinity of the coil end portion of each element coil according to the embodiment of the present invention.

FIG. 6 is a side view showing a connection state of armature windings according to the embodiment of the present invention.

FIG. 7 is a connection diagram showing a connection state of armature windings according to the embodiment of the present invention.

FIG. 8 is a plan view showing a conventional armature.

[Explanation of symbols]

1 Armature winding, 11 Straight part, 12, 13 Coil end part, 14 Lead lead part, 2, 3 Unit coil, 21, 22, 31, 32 Element coil, 4 Insulation sheet, 5 Intermediate plate, 51, 52 Extraction Holes, 6, 7
Drawer lead, U, Z, V, X, W, Y lead lead

Claims (2)

[Claims] 1. A method of fixing an armature winding of a linear motor, wherein a unit coil composed of a plurality of element coils is fixed to both sides of a flat plate-shaped intermediate plate extending in a moving direction to form an armature winding. An electric motor for a linear motor, wherein a hole is provided in a portion corresponding to a coil end portion of the unit coil, and the coil end portions of the unit coils on both sides are inserted into the hole and fixed by adhesion to each other. Child winding fixing method. 2. An end portion of a lead-out lead drawn out from the coil end portion is formed in parallel with the element coil and in the same shape on the same plane, and is formed from the coil end portion in the longitudinal direction of the armature. The method of fixing an armature winding of a near motor according to claim 1, wherein the armature winding is fixed to protrude.