JP2008099429A - Print coil and print motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a print coil that enhances motor efficiency and a print motor. <P>SOLUTION: In straight portions 30a of multiple coil pieces 20a provided in a print coil, there is formed a parallel circuit portion 34a that connects the side of an inner connecting piece 22a and the side of an outer connecting piece 24a in parallel. Therefore, it is possible to set the width W1 of each of conductor portions 36a provided in parallel in the parallel circuit portion 34a to a small value and further increase the number of the conductor portions 36a. This makes it possible to suppress eddy current loss in the print coil and further reduce armature resistance. As a result, the motor efficiency of a print motor can be enhanced. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a print coil and a print motor, and more particularly to a print coil including a plurality of coil pieces and a print motor including the same as an armature.

  Conventionally, the following are known as this type of print motor (for example, see Patent Document 1). In the print motor described in Patent Document 1, the rotor is provided with a print coil. This printed coil is provided with a plurality of coil pieces for constituting an armature coil. When a brush is brought into contact with the printed coil and a drive current is supplied, the printed coil generates a magnetic field and generates a rotational force of the rotor according to Fleming's left-hand rule.

By the way, in this kind of print motor, as one means for improving the motor efficiency, it is conceivable to set the conductor width of the coil piece large. That is, when the conductor width of the coil piece is set large, the armature resistance can be lowered and the resistance loss can be reduced. However, when the conductor width of the coil piece is set large as described above, the eddy current loss of the coil piece increases conversely, and the rotation loss increases. As a result, the motor efficiency may be reduced.
JP 2000-31450 A

  The present invention has been made in view of the above problems, and an object thereof is to provide a print coil and a print motor that can improve motor efficiency.

  In order to solve the above-mentioned problem, in the printed coil according to claim 1, at least two layers in which a plurality of coil pieces are arranged in a ring shape are provided with an insulating plate interposed therebetween, and an inner connection of each odd-numbered coil piece In the printed coil, each piece is connected to the inner connection piece of the even-numbered coil piece adjacent to one side in the axial direction, and the outer connection piece of each coil piece of each layer is connected to the outer connection piece of the coil piece of the other layer. A part of at least one of the plurality of coil pieces is formed with a parallel circuit portion for connecting the inner connection piece side and the outer connection piece side in parallel.

  According to the printed coil according to claim 1, at least two layers in which a plurality of coil pieces are arranged in a ring shape are provided with an insulating plate interposed therebetween, and the inner connection pieces of the odd-numbered coil pieces are respectively in the axial direction. Are connected to the inner connection pieces of the even-numbered coil pieces adjacent to each other, and the outer connection pieces of the respective coil pieces of each layer are connected to the outer connection pieces of the coil pieces of the other layers. Thereby, a some coil piece is connected and a some armature coil is comprised by the printed coil. When a brush is brought into contact with the printed coil and a drive current is supplied, the printed coil generates a magnetic field and generates a rotational force of the rotor according to Fleming's left-hand rule.

  Here, a parallel circuit portion that connects the inner connection piece side and the outer connection piece side in parallel is formed in a part of at least one of the plurality of coil pieces provided in the printed coil. Therefore, the number of conductor parts can be increased while setting the width of each conductor part provided in parallel to the parallel circuit part small. Thereby, armature resistance can be made low, suppressing the eddy current loss in a printed coil. As a result, the motor efficiency can be improved.

  A printed coil according to a second aspect is the printed coil according to the first aspect, wherein the parallel circuit portion is formed in a branched shape by forming a slit portion along the longitudinal direction in the coil piece. It is characterized by that.

  According to the printed coil according to claim 2, the parallel circuit portion can be easily formed on a part of the coil piece by simply forming a slit portion along the longitudinal direction in the coil piece to make a part of the coil piece branched. And it can form reliably.

  The printed coil according to claim 3 is the printed coil according to claim 2, wherein the coil piece is configured to have a wide portion wider than other portions in a part thereof, and the slit portion is It is formed in the said wide part, It is characterized by the above-mentioned.

  According to the printed coil of the third aspect, since the width dimension has a margin if it is a wide portion of the coil piece, the parallel circuit portion can be easily formed. In addition, when the plurality of coil pieces are arranged with the wide portions adjacent to each other, the gap between the plurality of coil pieces can be reduced, and the waste member after punching when the coil pieces are formed by punching a copper plate can be used. Less. In addition, when a plurality of coil pieces are arranged with the wide portions next to each other, the gap portion between the plurality of coil pieces is a portion that is discarded when the coil pieces are formed by punching a copper plate. By forming the parallel circuit part in the part, this part can be used effectively, and even if the parallel circuit part is formed in this part, it is possible to suppress an increase in cost.

  The printed coil according to claim 4 is the printed coil according to claim 2 or 3, wherein the coil piece is positioned on the inner connecting piece side and forms an involute curve, and the outer side. An outer involute curve portion that is positioned on one side of the connection and forms an involute curve shape, and a linear portion that is positioned between the inner involute curve portion and the outer involute curve portion, and the slit portion is formed on the straight portion. It is formed.

  According to the printed coil according to claim 4, even when the coil piece is formed with the inner involute curve portion located on the inner connection piece side and the outer involute curve portion located on the outer connection piece side, the slit portion described above is formed. Since it is formed in the linear part located between an inner side involute curve part and an outer side involute curve part, the process of a slit part is easy. Thereby, even when the inner involute curve portion located on the inner connection piece side and the outer involute curve portion located on the outer connection piece side are formed on the coil piece, the parallel circuit portion is easily and reliably provided on a part of the coil piece. Can be formed.

  According to a fifth aspect of the present invention, there is provided a printed motor comprising the printed coil according to any one of the first to fourth aspects as an armature to which a driving current is supplied via a brush to be abutted. Features.

  According to a fifth aspect of the present invention, when a brush is brought into contact with the print motor and a drive current is supplied to the print motor, the print coil generates a magnetic field and generates a rotational force of the rotor according to Fleming's left-hand rule. To do. At this time, in the printed coil, the eddy current loss is suppressed and the armature resistance is lowered, thereby improving the motor efficiency.

  First, the configuration of the print motor 50 according to an embodiment of the present invention will be described.

  FIG. 1 is a side sectional view showing the overall configuration of a print motor 50 according to an embodiment of the present invention. The print motor 50 shown in this figure is suitably used for a cooling system for a radiator mounted on a vehicle, for example. The print motor 50 is provided with a motor housing 52.

  The motor housing 52 includes an end frame 54 and a cover housing 56. The end frame 54 is formed in a substantially disk shape, and has a center hole 54a at the center thereof. The base end portion of the shaft 58 is fixed to the center hole 54a. The cover housing 56 is fixed to the outer peripheral side end portion of the end frame 54, and includes a cylindrical portion 56a extending along the axial direction and a disk portion 56b extending radially inward from the end portion of the cylindrical portion 56a. It is configured.

  A pair of resin brush holders 60 are fixed to the end frame 54. Each brush holder 60 is formed with a brush accommodating portion 62 that opens into the motor housing 52, and a brush 64 is accommodated in the brush accommodating portion 62 so as to be movable in the axial direction. A spring 66 is accommodated in the brush accommodating portion 62. The brush 64 is urged toward the cover housing 56 by the spring 66. An annular magnet 68 is fixed on the outer peripheral side of the end frame 54. The magnet 68 is alternately magnetized with N and S poles in the circumferential direction.

  A substantially cylindrical center piece 70 is rotatably supported on the outer peripheral portion of the shaft 58 via bearings 72 and 74. The center piece 70 is accommodated in the motor housing 52, and one end thereof is exposed to the outside from the central hole 56 c of the cover housing 56. A printed coil 10 formed in a substantially disk shape having an outer diameter larger than that of the magnet 68 is fixed to the outer peripheral portion of the center piece 70 in the axial direction intermediate portion. As shown in the side sectional view of FIG. 6, the printed coil 10 includes four conductive layers 12 a to 12 d that are adjacent to each other in the axial direction, and three insulating layers 14 a to 14 c disposed therebetween. ing.

  The structure of the printed coil 10 and the manufacturing method thereof will be described in detail below. In the printed coil 10, the four conductive layers 12a to 12d use the four copper plates 16a to 16d shown in FIGS. Manufactured respectively. 2A is a front view of the copper plate 16a for forming the first conductive layer 12a, and FIG. 2B is a back surface of the copper plate 16b for forming the second conductive layer 12b. 3A is a front view of the copper plate 16c for forming the third conductive layer 12c, and FIG. 3B is the back surface of the copper plate 16d for forming the fourth conductive layer 12d. Each figure is shown.

In order to form the first conductive layer 12a and the second conductive layer 12b, first, FIG.
As shown in (a) and (b), a large number of substantially arc-shaped pores 18a and 18b extending in the radial direction are formed in the square copper plates 16a and 16b by punching. At this time, the copper plate 16a and the copper plate 16b are processed so as to have the same shape when viewed from the surface. And by this punching, it forms as coil pieces 20a and 20b arranged in a ring shape except for both ends of the portions left between the respective pores 18a and 18b, and the inner ends thereof as inner connection pieces 22a and 22b. The outer ends thereof are formed as outer connection pieces 24a and 24b.

  At this time, more specifically, the copper plate 16a for forming the first conductive layer 12a and the copper plate 16b for forming the second conductive layer 12b are shown in FIG. Thus, each coil piece 20a, 20b is formed. In addition, in FIG. 4, the code | symbol of each part structure of the coil piece 20b is shown in parenthesis writing.

  That is, the coil piece 20a (20b) is positioned on the inner connection piece 22a (22b) side and forms an involute curve, and the involute curve portion 26a (26b) is positioned on the outer connection piece 24a (24b) side. A curved outer involute curve portion 28a (28b) and a linear portion 30a (30b) positioned between the inner involute curve portion 26a (26b) and the outer involute curve portion 28a (28b) are formed.

  The straight portion 30a (30b) is a wider portion wider than the inner involute curve portion 26a (26b) and the outer involute curve portion 28a (28b). Further, slit portions 32a (32b) are formed along the longitudinal direction in the straight portions 30a (30b) to form branched parallel circuit portions 34a (34b).

Similarly, in order to form the third conductive layer 12c and the fourth conductive layer 12d, FIG.
As shown in (a) and (b), a large number of substantially arc-shaped pores 18c and 18d extending in the radial direction are formed in the square copper plates 16c and 16d by punching. At this time, about the copper plate 16c and the copper plate 16d, it processes so that it may become the same shape seeing from the surface. And by this punching, it forms as coil pieces 20c and 20d arranged in a ring shape except for both ends of the portions left between the respective pores 18c and 18d, and the inner ends thereof as inner connection pieces 22c and 22d. The outer ends are formed as outer connection pieces 24c and 24d.

  At this time, more specifically, a copper plate 16c for forming the third conductive layer 12c and a copper plate 16d for forming the fourth conductive layer 12d are shown in FIG. Thus, the coil pieces 20c and 20d are formed. In FIG. 5, the reference numerals of the components of the coil piece 20d are shown in parentheses.

  That is, the coil piece 20c (20d) is positioned on the inner connection piece 22c (22d) side and forms an involute curve, and the inner involute curve portion 26c (26d) is positioned on the outer connection piece 24c (24d) side. A curved outer involute curve portion 28c (28d) and a linear portion 30c (30d) positioned between the inner involute curve portion 26c (26d) and the outer involute curve portion 28c (28d) are formed.

  The straight portion 30c (30d) is a wider portion wider than the inner involute curve portion 26c (26d) and the outer involute curve portion 28c (28d). Further, a slit portion 32c (32d) is formed along the longitudinal direction in the straight portion 30c (30d) to form a branched parallel circuit portion 34c (34d).

  Subsequently, the inner connection pieces 22a to 22d of the coil pieces 20a to 20d are formed by cutting the center portions of the copper plates 16a to 16d shown in FIGS. Then, as shown in FIG. 6, the copper plate 16 a and the copper plate 16 b are bonded back to back with an annular insulating sheet 38 a interposed therebetween. At this time, the inner connection piece 22a of the copper plate 16a and the inner connection piece 22b of the copper plate 16b are overlapped so as to face the orthogonal direction of the copper plates 16a and 16b.

  Similarly, the copper plate 16c and the copper plate 16d are overlapped and bonded back to back with an annular insulating sheet 38c interposed therebetween. At this time, the inner connection piece 22c of the copper plate 16c and the inner connection piece 22d of the copper plate 16d are stacked so as to face each other in the orthogonal direction of the copper plates 16c and 16d. Then, as shown in FIG. 6, the inner connection piece 22a of the copper plate 16a and the inner connection piece 22b of the copper plate 16b, and the inner connection piece 22c of the copper plate 16c and the inner connection piece 22d of the copper plate 16d are welded portions 40 and 42, respectively. Weld by.

  Subsequently, an annular insulating sheet 38b is sandwiched between the two sets of copper plates 16a and 16b and the copper plates 16c and 16d, which are made into a set of two pieces in this manner, and are bonded to each other back to back. At this time, the outer connection piece 24a of the copper plate 16a and the outer connection piece 24d of the copper plate 16d are stacked so as to face each other in the orthogonal direction of the copper plates 16a to 16d, and the outer connection piece 24b of the copper plate 16b and the outer connection piece 24c of the copper plate 16c are stacked. The copper plates 16a to 16d are stacked so as to face each other in the orthogonal direction.

  Subsequently, the outer connection pieces 24a to 24d of the coil pieces 20a to 20d are formed by cutting off the outer sides of the copper plates 16a to 16d in a circular shape. Then, the outer connection piece 24d of the copper plate 16a and the outer connection piece 24d of the copper plate 16d, and the outer connection piece 24b of the copper plate 16b and the outer connection piece 24c of the copper plate 16c are welded by welding portions 44 and 46, respectively. FIG. 7 shows a connection diagram of the inner connection pieces 22a to 22d and the outer connection pieces 24a to 24d of the coil pieces 20a to 20d. In this print motor 50, as shown in this figure, the inner connection pieces 22a to 22d and the outer connection pieces 24a to 24d of the coil pieces 20a to 20d are connected.

  When the printed coil 10 manufactured in this way is incorporated as an armature of the print motor 50 shown in FIG. 1, the brushes 64 are pressed against the surface of the fourth layer coil piece 20d.

  Further, in the print motor 50 configured as described above, when a drive current is supplied to the print coil 10 via each brush 64, the print coil 10 generates a magnetic field, and the rotation of the rotor is performed according to Fleming's left-hand rule. Generate power. Accordingly, the printed coil 10 and the center piece 70 are integrally rotated while being supported by the shaft 58.

  Next, a characteristic operation of the print motor 50 according to the embodiment of the present invention will be described in comparison with a comparative example.

  FIG. 8 shows a coil piece 120 of a printed coil according to a comparative example. As shown in this figure, the coil piece 120 of the printed coil according to the comparative example is located on the inner connection piece 122 side and is located on the outer connection piece 124 side and the inner involute curve portion 126 having an involute curve shape. An outer involute curve portion 128 having an involute curve shape and a straight portion 130 positioned between the inner involute curve portion 126 and the outer involute curve portion 128 are configured.

  Here, when the conductor width of the coil piece 120 is set large, the armature resistance can be lowered and the resistance loss can be reduced, but the eddy current loss increases conversely, and the rotation loss increases. Therefore, in this comparative example, the conductor width of the widest linear portion 130 is set to a dimension W1 (for example, 1 mm) at which the eddy current loss is the maximum value in the allowable range.

  However, in this comparative example, the size of the conductor width of the straight portion 130 is small, and there is room for improvement in order to improve motor efficiency. Moreover, when the conductor width of the coil piece 120 is set to the dimension W1 as in this comparative example, the gap 121 between the coil pieces 120 becomes large, and the number of parts to be discarded at the time of punching increases.

  On the other hand, according to the printed coil 10 which concerns on one Embodiment of this invention, as FIG. 4, FIG. 5 shows in the some coil piece 20a-20d provided in the printed coil 10, the linear part 30a. Parallel circuit portions 34a to 34d are respectively formed at ˜30d. Therefore, it is possible to increase the number of conductor parts 36a to 36d while setting the width of each of the conductor parts 36a to 36d provided in parallel to the parallel circuit parts 34a to 34d small.

  That is, for example, the conductor widths of the conductor portions 36a to 36d of the parallel circuit portions 34a to 34d are set to the same dimension W1 (for example, 1 mm) as that of the comparative example, and a plurality of the conductor portions 36a to 36d ( In this case, it can be set to two each). Therefore, as compared with the configuration according to the comparative example, the conductor widths of the straight portions 30a to 30d are set to the same size, so that the eddy current loss in the printed coil 10 is suppressed to the same level, and the conductor widths of the straight portions 30a to 30d are the same. The armature resistance in the printed coil 10 can be lowered by increasing the total dimension. As a result, the motor efficiency can be improved.

  Moreover, according to the printed coil 10 which concerns on one Embodiment of this invention, since there is room in a width dimension if it is the linear parts 30a-30d which are the wide parts of the coil pieces 20a-20d, each of the parallel circuit parts 34a-34d is each. It can be formed easily. In addition, as in the present embodiment, when the plurality of coil pieces 20a to 20d are arranged with the linear portions 30a to 30d being wide portions adjacent to each other, between the coil pieces of the plurality of coil pieces 20a to 20d, respectively. , And the number of discarded members after punching when the coil pieces 20a to 20d are formed by punching the copper plates 16a to 16d can be reduced.

  Further, when the plurality of coil pieces 20a to 20d are arranged with the linear portions 30a to 30d next to each other as in the present embodiment, the gap portions between the coil pieces of the plurality of coil pieces 20a to 20d are coiled. Since the pieces 20a to 20d are portions that are discarded when the copper plates 16a to 16d are formed by punching, the parallel circuit portions 34a to 34d are formed in these portions, and this portion can be effectively used. Even if the parallel circuit portions 34a to 34d are formed in the portions, it is possible to suppress an increase in cost.

  Moreover, according to the printed coil 10 which concerns on one Embodiment of this invention, the slit parts 32a-32d are formed along the longitudinal direction in the coil pieces 20a-20d, and the linear parts 30a-30d of the coil pieces 20a-20d are branched. The parallel circuit portions 34a to 34d can be easily and reliably formed on a part of the coil pieces 20a to 20d, respectively, by simply forming the shape.

  Moreover, according to the printed coil 10 which concerns on one Embodiment of this invention, the inner involute curve part 26a-26d located in the inner side connection piece 22a-22d side, and the outer side connection piece 24a-24d side on coil piece 20a-20d. Even when the outer involute curve portions 28a to 28d positioned at the same position are formed, the slit portions 32a to 32d are linear portions 30a positioned between the inner involute curve portions 26a to 26d and the outer involute curve portions 28a to 28d. The slit portions 32a to 32d can be easily processed since they are formed at ˜30d.

  Thereby, the inner involute curve portions 26a to 26d located on the inner connection pieces 22a to 22d side and the outer involute curve portions 28a to 28d located on the outer connection pieces 24a to 24d side are formed on the coil pieces 20a to 20d, respectively. Even in such a case, the parallel circuit portions 34a to 34d can be easily and reliably formed on a part of the coil pieces 20a to 20d, respectively.

  Next, a modified example of the print motor 50 according to an embodiment of the present invention will be described.

  In the above-described embodiment, four layers of conductive layers 12a to 12d including the coil pieces 20a to 20d are provided on the printed coil 10, but the conductive layers 12a to 12d including the coil pieces 20a to 20d on the printed coil 10 are, for example, Two layers may be provided, and six layers may be provided.

  Moreover, in the said embodiment, although the two conductor parts 36a-36d were provided in the parallel circuit parts 34a-34d of the coil pieces 20a-20d, a conductor part is provided in the parallel circuit parts 34a-34d of the coil pieces 20a-20d, respectively. Three or more 36a-36d may be provided.

1 is a side cross-sectional view illustrating an overall configuration of a print motor according to an embodiment of the present invention. It is a top view which shows the copper plate for forming the coil piece of the printed coil which concerns on one Embodiment of this invention. It is a top view which shows the copper plate for forming the coil piece of the printed coil which concerns on one Embodiment of this invention. It is a top view which shows the structure of the coil piece which concerns on one Embodiment of this invention. It is a top view which shows the structure of the coil piece which concerns on one Embodiment of this invention. It is side surface sectional drawing which shows the structure of the printed coil which concerns on one Embodiment of this invention. It is a connection diagram of the printed coil which concerns on one Embodiment of this invention. It is a top view which shows the structure of the coil piece which concerns on a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Print coil, 12a-12d ... Conductive layer, 14a-14c ... Insulating layer, 16a-16d ... Copper plate, 18a-18d ... Fine pore, 20a-20d ... Coil piece, 22a-22d ... Inner connection piece, 24a-24d ... Outer connection piece, 26a to 26d ... Inner involute curve part, 28a to 28d ... Outer involute curve part, 30a to 30d ... Straight line part, 32a to 32d ... Slit part, 34a to 34d ... Parallel circuit part, 36a to 36d ... Conductor Part, 38a-38c ... insulating sheet, 40, 42, 44, 46 ... welded part, 50 ... print motor, 52 ... motor housing, 54 ... end frame, 56 ... cover housing, 58 ... shaft, 60 ... brush holder, 62 ... Brush housing part, 64 ... Brush, 66 ... Spring, 68 ... Magnet, 70 ... Center piece, 72 74 ... bearing

Claims (5)

At least two layers in which a plurality of coil pieces are arranged side by side are provided across an insulating plate, and the inner connection pieces of the odd-numbered coil pieces are connected to the inner side of the even-numbered coil pieces adjacent to each other in the axial direction. In the printed coil, which is connected to the piece and the outer connection piece of each coil piece of each layer is connected to the outer connection piece of the coil piece of the other layer,
A printed coil, wherein a parallel circuit portion that connects the inner connection piece side and the outer connection piece side in parallel is formed in a part of at least one of the plurality of coil pieces.   The printed coil according to claim 1, wherein the parallel circuit portion is formed in a branched shape by forming a slit portion in the coil piece along a longitudinal direction. The coil piece is configured to have a wide part wider than other parts in a part thereof,
The printed coil according to claim 2, wherein the slit portion is formed in the wide portion. The coil piece is
An inner involute curve portion positioned on the inner connection piece side to form an involute curve; and
An outer involute curve portion positioned on the outer connection piece side to form an involute curve; and
A straight line portion located between the inner involute curve portion and the outer involute curve portion;
With
The printed coil according to claim 2, wherein the slit portion is formed in the linear portion.   5. A print motor comprising the printed coil according to claim 1 as an armature to which a drive current is supplied via a brush to be contacted. 6.

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