JPS59216434A - Printed coil - Google Patents

Abstract

PURPOSE:To obtain a printed coil having reliability and excellent productivity by forming a wiring pattern block and a coil conductor pattern on an insulating sheet, and sequentially bending and laminating the conductor pattern on the block in such a manner that the phases are brought into coincidence. CONSTITUTION:A polyphase printed coil sheet 20 is formed in such a manner that a wiring pattern block 21 is arranged at the center of an insulating sheet 16 and 6 1-phase coil blocks 22A-22F are arranged on concentric circles at the periphery. Such sheets 20 are sequentially laminated with the block 21 as a center in such a manner sequentially folding the blocks 22A-22F. In this case, when the blocks are folded so that connecting conductors 26A-26C 28A-28C, 29A-29C are disposed inside, the connecting conductors are protected on the surface by the sheet 16. In this manner, there is no possibility of arising a problem such as the disconnection or improper contact of the connecting portions.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a fixed coil for an electric motor, and particularly to a printed coil of a multi-phase configuration for an axial gap type electric motor.

[Background of the invention]

The axial gap type electric motor has a general structure as shown in the vertical cross-sectional view of FIG. 1, and consists of a stator 1 and a rotor 2. This stator 1 has a stator coil 3 and a stator yoke 4 integrally fixed to a housing 5,
A magnetic shield protection cover 6 covering the stator coil 3, stator yoke 4, and rotor 2 is provided at the bottom thereof. Further, in the rotor 2, a rotary yoke 10 is fixed to a shaft 8 which is rotatably supported by two bearings 7 and 7' fixed to the housing 5 via a boss 9. A permanent magnet 11 is fixedly attached to the magnet. A collar 12 is fitted between the lower inner bearing 7' of the two bearings and the upper surface of the post 9.

Further, a shaft fastener 13 is fixed to the shaft 8 in contact with the upper surface of the upper bearing 7. The rotor yoke 1
As shown in FIG. 2, the permanent magnet 11 fixedly attached to the shaft 1 is divided in the circumferential direction into a required number of poles, for example, 8 poles, and is magnetized alternately in opposite directions parallel to the shaft 1. . Therefore, the magnetic flux emitted from the N pole passes through the stator coil 3, enters the stator yoke 4, and enters the 8 of the adjacent permanent magnet 11.
reach the pole. The stator coil 3 is wound in multiple phases, and by energizing the stator coil 3, a shift torque can be generated. A Hall element 14 is fixed to the stator yoke 4 and detects the distribution of magnetic flux. The stator coil 3 has a flat shape, and the third stator coil 3 has a flat shape.
It is composed of printed coils as shown in Figure 4.5. This grid/tocoil is covered by U.S. Patent No. 4,340,833.
As is well known from No. 1, a coil is constructed by forming a conductor on the surface of an insulating sheet by means such as plating or etching. The conductor pattern of a one-phase coil block 15 acting as a coil is shown. FIG. 4 is a sectional view showing the AHAH section of FIG. 3. As shown in FIG. 3.4, this conductor pattern is composed of a plurality of spiral conductors on both sides of the insulating sheet 16.

To explain the coil for one pole, the insulating sheet 1
Polar coils 17A and 17B formed on the front and back sides of 6, respectively.
are connected in series through the through hole 18.
It constitutes a polar coil. These pole coils 17A
, 17B are arranged to add to each other. As shown in FIG.
The phase coil block 15 is a coil for one phase.
Connection terminals 19A and 19B are the beginning and end of winding of the coil, respectively. If the number of turns is insufficient for one phase coil, a plurality of one phase coil blocks 15 are stacked with the same phase as shown in FIG.
Connect 9A and 19B in series. A thin insulating sheet (not shown) or the like is sandwiched between these one-phase coil blocks 15 for insulation.

When stacking an appropriate number of single-phase coil blocks 15 to form a multi-phase coil in this way, connections between the single-phase coil blocks and between phases must be made after stacking as described above.
Conventionally, the connection terminals were connected using methods such as soldering.

In this connection method, the conductor thickness of the connection terminal is 100 mm.
Since it is quite thin (around μn1), there were problems in that the solder adhesion was poor and the solder easily peeled off, resulting in a lack of reliability. Another disadvantage is that when the number of terminals to be connected increases, reliable connections cannot be easily made, resulting in poor productivity.

[Purpose of the invention]

The present invention has been made in view of the above points, and its purpose is to provide a reliable and highly productive grid/
To provide coils.

[Summary of the invention]

The present invention involves forming a wiring pattern block and the conductor patterns of a plurality of coils arranged around the same insulating sheet by a method such as plating or etching, and then folding these wiring pattern blocks and the conductor patterns of the plurality of coils. The conductor patterns of the plurality of coils are electrically connected together through a bent portion, and the conductor patterns of the plurality of coils are sequentially bent and stacked on the wiring pattern block in phase with each other at this bent portion, thereby forming a flat multiphase structure. The intended purpose is achieved by assembling it into a coil.

[Embodiments of the invention]

An embodiment of the printed coil according to the present invention will be described below with reference to the drawings.

An embodiment of the present invention is shown in Figure 6.7.8. As shown in FIG. 6, the multiphase printed coil sheet 20 is formed by forming multiphase coils on both sides of the same insulating sheet 16, and in this embodiment, it is formed of three phases and eight poles. This multi-phase printed coil sheet 20 has a wiring pattern block 21 arranged in the center, and around this wiring pattern block 21 there are six 1-phase coil blocks 22A, 22B arranged concentrically.
.

22p, 22D, 22E, and 22F are provided. 1
The phase coil consists of two 1-phase coil block groups, and the U phase is 1-phase coil block 22A.

22B and V phases are the same (22C and 22DXW phases are 22
E and 22F, respectively. These one-phase coils are connected in a three-phase star connection via the wiring block 21, and the coil input terminals are 23, 24, and 25. To explain the current path for the U phase, first input from the coil input terminal 23,
One connecting conductor 26A' enters the 1-phase coil block 22, then passes through the connecting conductor 26B, enters the 1-phase coil block 22B, and further passes through the connecting conductor 26C to reach the through hole 27. The same goes for the ■ phase and W phase, where the input terminal 24.25 force λ is input, and the connecting conductor 28
A, 28B, 28C, tfc is 29A, 29B, 29C
1 phase coil block 22E, 22F or 2
It passes through 2C and 22D to reach the through hole 27.

These through-holes 27 for the U-phase, ■-phase, and W-phase are connected to each other by an interphase connection conductor 30, and form a neutral point of the multiphase coil. The wiring nozzle/block 21 and each one-phase coil block 22A.

22B, 22C, 22D, 22E, and 22F are bridge portions 31A, 31B, 31C, and 31D, respectively.

They are connected via 31g and 31F. In this way, the multiphase printed coil sheet 20 is connected to all phases of electricity.

A method of assembling one embodiment g0 of the present invention configured as described above will be described below. Multiphase printed coil sheet 2
Each one-phase coil block 22A, 22B is centered around the turn block 21 where the wire 0 is connected.

22C, 22D, 22E, and 22F are sequentially folded and stacked in a black pattern to form a stator coil having an appearance as shown in FIG. In this case, the connecting conductor 26A.

26B, 26C, 28A, 28B, 28C, 29A.

If you fold 29B and 29C so that they are inside,
As shown in FIG. 7, for example, the connection conductor 26A is connected to the insulation sheet 1.
Since the surface is protected by 6, there is no need to consider insulation from surrounding members of the stator coil, which is advantageous in terms of structure. In addition, the bridge portion 31 of the 1-phase coil block 26A
The folded state of A is as shown in Figure 7, and the thickness is about l.
OOμm.

It has been experimentally confirmed that even if a copper foil of approximately 12 tan rl is bent repeatedly into the state shown in the figure about 10 times, no cracks will occur in the copper foil, as shown in Figure 7.8. Even if the multi-phase printed coil sheet 20 is assembled as shown in FIG. Bridge parts 31A, 31B, 31C, 3 shown in FIG.
1D, 31B.

31F dimension stone h zi l tl + t4 + z
, l 16 is dimensioned so that it does not protrude more than necessary on the outer peripheral surface of the stator coil 3 during stacked assembly, and J!
4.

L2 meeting'* + 14 # L5 + tl length is 1
It increases according to the folding order of the phase coil blocks. For example, considering the balance of induced voltages in each layer, first connect the U-phase one-phase coil block 22A to the wiring pattern block 21.
Fold to match. Next, V-phase 1-phase coil block 2
2C, W' phase 1-phase coil block 22E are folded in this order, and then 22F and 22D.

Fold in the order of 22B. In such a case, tl, t,.

The relationship between the size of tl * t4 + ts + ja is 1
1 <t, Gumu (ts <t4 <ts), so that it increases in accordance with the folding order of the l-phase coil block.Also, the dimension of tl is the same as the thickness T of the bridge portion 31A when it is folded. It is obvious that the number of coil blocks will be larger than that.
2B to the wiring pattern block 21 side, the conductor patterns of the pole coils are matched so that the magnetic fluxes generated by each pole coil are added together, and the winding direction is of course taken into account. Similarly, the distance between each phase is 120
The arrangement and inclination of the one-phase coil block and pole coils are also taken into consideration so that the electrical angle is .degree.

As is clear from the above description, the printed coil according to the embodiment of the present invention has no electrical connection points and has exactly the same characteristics as the conventional stator coil shown in FIG. You can have more. As is clear from FIG. 6, the 1-phase coil block constituting the 1-phase coil,
That is, 22A and 22B for the U phase, and 22c for the V phase.

Regarding the 22D and W phases, 22B and 22F are arranged adjacent to each other, making the connection easier.

Other embodiments according to the present invention are described in Section 9. It is shown in FIG. The numbers and symbols in the figures indicate the same functional members as in FIG. 6. In the embodiment shown in FIG. 9, mutual connections are made between wiring pattern blocks 21, and connections between l-phase coil blocks are made at one location on the outer periphery of each corresponding one-phase coil block. In this way, it is possible to increase the space around the outer periphery of the wiring pattern block z1, and it is possible to reduce dimensional restrictions on the coil input terminal portion. It is also possible to combine the embodiment shown in FIG. 6 described above and this embodiment. 1st
Figure 0 shows an example of the arrangement of one-phase coil block groups, and various modifications can be considered, such as effective use of insulating sheets, installation of connecting conductors, and arrangement suitable for mass production.

FIG. 11 is a schematic diagram showing an example in which a large number of multiphase printed coils 20 are formed on an insulating sheet 16. If such an arrangement is adopted, the insulating sheet can be used effectively and costs can be reduced. becomes possible.

〔Effect of the invention〕

As described above, according to the present invention, the conductor patterns of a plurality of coils are integrally formed by printed wiring on the same insulating sheet with the wiring pattern block as the center, and the conductor patterns of the plurality of coils are connected through the bent portions. Since it is sequentially folded and laminated on top of the wiring butter 7 block with the same phase, there is a risk that the multi-phase printed coil will not be connected by solder, etc., and problems such as disconnection or poor contact may occur at the connection point. The benefits are significant, as we are now able to provide highly reliable printed coils without any defects, while improving productivity, ensuring accuracy, and lowering costs.

[Brief explanation of drawings]

Figure 1 is a longitudinal cross-sectional view of an axial gap type electric motor, Figure 2
The figure is a perspective view showing the magnetized state of the permanent magnet fixed to the rotor, Figure 3 is a plan view showing the conductor pattern of the 1-phase coil block, Figure 4 is a sectional view showing the pole coil, and Figure 5
The figure is a perspective view showing the laminated state of the foot coil, FIG. 6 is a plan view showing an embodiment of the multiphase printed coil according to the present invention, FIG. 7 is a sectional view showing the structure of the folded part, and FIG. 8 9 is a perspective view showing the stacked state, FIGS. 9 and 10 are plan views showing other embodiments of the present invention, and FIG. 11 is a plan view showing an example of the arrangement of multiphase printed coils. . . DESCRIPTION OF SYMBOLS 1... Stator, 2... Rotor, 3... Stator coil, 11... Permanent magnet, 15... 1-phase coil block, 16... Insulating sheet, 17A, 17B...・Pole coil, 18.27...Through hole, 19A, 19B
...Connection terminal, 20...Multiphase glint coil sheet, zl...Wiring pattern block, 22A, 22B,
22C. 22D, 22B, 22F...1 phase coil block, 2
3.24.25...Input terminals, 26A, 26B. 26C, 28A, 28B, 28C, 29A, 29B. 29C...Connection, connection conductor, 30...Interphase connection conductor, 3
1A. 31B, 310, 311), 31E, 31F...Buri No. 1 8 1/ 2nd mouth 3rd mouth 4th illustration 7 Figure 8 mouth 3/C31E 9th mouth also 70 Figure/6 Katsuta City Oaza Inada 1410 Hitachi, Ltd. Tokai Factory

Claims (1)

[Claims] 1. In a printed coil in which the conductor pattern of the coil is formed on an insulating sheet, the output wires for each phase are formed around the printed wiring pattern block via a bendable bridge. . A printed coil formed by bending and stacking a plurality of coil conductor patterns, which are electrically connected to the lead wires of each phase, on the wiring pattern block so as to match the phases. 2. A patent claim characterized in that each of the one-phase coils constituted by the conductor patterns of the plurality of coils has an input terminal, and wiring from the input terminal to a common connecting conductor is printed and connected in series. range 1
Printed coil as described in section.