JPS61210849A - Sheet coil motor - Google Patents

Abstract

PURPOSE:To remove the unevenness of rotation, by arranging a plurality of sheet coil layer-built units getting out of position by specified phase, on a circular yoke. CONSTITUTION:Three sheet coil layer-built units C of coil elements connected in series, getting out of position by specified phase, are arranged on the same surface, namely, on a steel plate yoke 11. By this method, distances between a magnet M and each sheet coil layer-built unit C are equal to one another, and the values on the magnetic flux density Bg contributing to each sheet coil layer-built unit C and uniform together. Accordingly, respective torque generated by each sheet coil layer-built unit C is equal to one another, and the unevenness of rotation is not generated.

Description

[Detailed description of the invention] 〔Technical field〕 This invention relates to a sheet coil motor.

[Prior art]

FIG. 1 shows an example of a conventional sheet coil motor, which is a three-phase sheet coil motor.

In the figure, Y is the rotor yoke, M is the magnet fixed to the rotor yoke Y, S is the rotation axis of the rotor yoke Y, and H
1 is a bearing housing to which a rotating shaft S is attached via a bearing B, and K is a sheet coil assembly, which is attached by fitting the central hole into the bearing housing H. In this sheet coil assembly, three sheet coils 2 are bonded to a steel plate yoke 1 with an insulating layer 3 interposed therebetween, with a predetermined phase angle shifted from each other, that is, they are laminated. 4
is a Hall element placed in hole 5 made in iron plate yoke l,
This is for detecting the position of the magnet M facing the sheet coil assembly K.

As shown in FIG. 2, the sheet-like coil 2 has a plurality of coil elements 7 formed on the front and back sides of a circular substrate 6,
The front and back coil elements 7 are spot welded at a spot point 8 in the center of each coil element 7, thereby connecting all the coil elements 7 in series. Therefore, this sheet-like coil 2 functions as a drive coil when a current is passed through the terminals 9.10.

With this configuration, when a current is passed through the sheet coil 2 for a predetermined period of time by the Hall element 4, a torque is generated between the sheet coil 1 and the magnet M, and the rotor yoke Y rotates.

However, in such a conventional sheet coil motor, since the sheet coils 2 of each phase are stacked, the gap I between the magnet M and the iron plate yoke 1 is
As shown in FIG. 3, the axial magnetic flux density Bg at Lg has a gradient, and the value of the magnetic flux density contributing to each sheet-shaped coil 2 decreases as the distance from the magnet M increases. For this reason, even if the current is kept constant, the torque generated by each sheet-like coil 2 differs, which causes uneven rotation of the motor.

Therefore, conventionally, at least two or more sheet coils are used for each phase, for example, as shown in FIG.
Three pairs of sheet coils CI, C2, and C3, each consisting of two sheet coils 2, were sequentially stacked from the outside to the inside to make the magnetic flux density Bg uniform. However, although such a configuration can prevent the occurrence of uneven rotation, there are problems in that the gap ug between the magnet M and the iron plate yoke l increases, which not only increases the size of the motor but also increases the cost. there were.

In addition, the holes 5 drilled in the iron plate yoke 1 for arranging the Hall elements 4 were also a cause of uneven rotation, but in order to deal with this, for example, the inertia on the rotation side of the rotor yoke Y, etc. A method was adopted to make it larger. However, even in this case, although rotational unevenness can be eliminated, there is a problem in that the motor becomes larger and the cost increases.

[i-like]

The present invention has been made to solve these conventional problems, and its purpose is to provide a sheet coil motor that is compact, inexpensive, and free from uneven rotation.

〔Example〕

5 and 6 show an embodiment of the present invention, and FIG.
The figure is a sectional view thereof, and FIG. 6 is a plan view of the sheet coil assembly. This embodiment is a three-phase sheet coil motor.

In the figure, the same or corresponding parts as in FIG. 1 are given the same reference numerals. Kl is a sheet coil assembly, 3
A circular iron plate yoke 11
They are bonded with a predetermined phase shift, and with an interval W in terms of arrangement. 12 is an insulating layer interposed during this bonding.

The sheet-like coil laminate C is a substrate on which coil elements are printed on both sides, that is, sheet-like coils are laminated with an insulating layer interposed therebetween, and the coil elements are connected in series. In this embodiment, the structure is as follows.

That is, as shown in FIG. 7, a plurality of coil elements 14 corresponding to the conventional sheet-like coil 2 are printed on the front and back sides of an annular substrate 13, and spot points of each coil element 14 are printed. 15, front and back coil 1
A sheet-shaped coil Jl, -16 in which coil elements 4 are connected in series is divided into four equal parts between adjacent coil elements 14 and 14, folded as shown in Fig. 8, and laminated with an insulating layer 17 interposed between the overlapping parts. It is formed.

In the stacked state, the sheet-like coils 16 are divided into four equal parts and four sheets are stacked, and each coil element 14 is connected in series.

As described above, according to this embodiment, three sheet-like coil laminates C each having coil number elements 14 connected in series are arranged on the same surface, that is, on the iron plate yoke 11, with a predetermined phase shift. Therefore, the distance from the magnet M to each sheet-like coil laminate C becomes equal, and the value of the magnetic flux density ng contributing to each sheet-like coil laminate C becomes uniform.

Therefore, the torque generated by each sheet-like coil laminate C becomes the same, and uneven rotation does not occur.

In addition, the sheet-like coil laminate C has four substrates with an insulating layer 1
6, the stacking height is much lower than that of the conventional stacking of two or more sheet coils 2 per phase (Fig. 4). It is possible to achieve miniaturization and cost reduction.

Furthermore, since the sheet-like coil laminates C are arranged at intervals W, the Hall element 4 can be arranged here by utilizing this space.

Therefore, the hole 5 for the Hall element 4, which was conventionally required, is no longer necessary, and uneven rotation of the motor caused by the hole 5 can be eliminated. This eliminates the need to take measures such as increasing the inertia on the rotating side, as in the conventional case, so the motor can be made smaller and the cost can be reduced accordingly.

Note that the number of phases of the sheet coil motor and the number of calendars of the sheet-like coil laminate are not limited to those in the above embodiments.

〔effect〕

As explained above, according to the present invention, a plurality of sheet-like coil laminates are arranged on a circular yoke with a predetermined phase shift, so that there is no unevenness in one rotation, and the sheet coil is small and inexpensive. You can get the motor.

[Brief explanation of drawings]

Figure 1 is a sectional view showing a conventional sheet coil motor, Figure 2 is a sectional view showing a conventional sheet coil motor.
The figure is a plan view of the sheet coil in Figure 1, Figure 3 is an explanatory diagram of the operation of the sheet coil motor in Figure 1, Figure 4 is a cross-sectional view of main parts showing another conventional example, and Figure 5 is the invention. FIG. 6 is a plan view of the sheet coil assembly in FIG. 5, and FIGS. 7 and 8 are explanatory diagrams of how to make a laminated sheet coil. In the figure, K1 is a sheet coil assembly, C is a sheet-like coil laminate, 11 is an iron plate yoke, 14 is a coil element, and 12.17 is an insulating layer. Figure 1 Cause Figure 2 Figure 3 Figure 5 Ward Figure 6 Figure 7 Book Figure 8

Claims (1)

[Claims] A plurality of sheet coils are insulated and stacked, and
A sheet coil motor having a sheet coil assembly in which a plurality of sheet coil laminates each having coil elements of each sheet coil connected in series are disposed on the same plane with a predetermined phase shift circumferentially. .