JPS5895969A - Motor using printed board - Google Patents

Abstract

PURPOSE:To suppress and flatten the size of the axial direction to small value by forming a drive coil on the front and back surface of a printed board and laminating a plurality of printed boards. CONSTITUTION:The rotational shaft 1 of a motor is supported to bearings 2a, 2b fixed to a motor case. A permanent magnet 4, a printed board 6 and a stationary yoke 14 are mounted on the shaft 1. Drive coils 6a-6c are spirally and triangularly formed on the front and back surfaces of the board 6. A plurality of the boards 6 are laminated, and the drive coils are sequentially electrically connected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a motor having a driving coil on a printed board, and particularly aims to provide a motor structure that can contribute to flattening.

Driving coils are provided on the front and back surfaces of the Fuuinsha printed board, and by stacking a plurality of these printed boards, the dimension in the direction of the rotation axis is kept small and a flat motor is provided.

An embodiment of the present invention will be described in detail below with reference to the drawings.

Figure 1 shows an exploded view of the main parts of the motor structure.
Reference numeral 1 denotes a rotating shaft, and both ends thereof are supported by bearings 2 and 2b fixed to a motor case (not shown). 4
is a permanent magnet fixed to the rotating shaft IK, and the KN pole and S pole in the circumferential direction are alternately magnetized as shown in the figure. 6.
8. 10° 12 is a printed board, and driving coils are provided on the front and back surfaces of each printed board, and the first printed board 6 facing the permanent magnet 4 is supplied with electrical power. Electrical and other terminals are provided for receiving and each printed board is attached to the motor case. 14
is a fixed yoke attached to the motor case.

The printed boards 6 to 12 are a plurality of printed boards stacked together as shown in FIG. 16m and 16b are installed.

The driving coil of the printed board is formed by etching a steel pattern on the printed board so that the driving coils 6a, 6b, 6c, etc. are wound spirally or triangularly on the front and back sides of the printed board. As shown in FIG. After the appropriate winding, the through-holes on the front and back of the printed board are electrically connected and connected to the back side of the first printed board 6, and then from the inside to the outside. It is wound in a spiral or triangular shape as shown by the dotted line in FIG. The encircling end of the coil 6a' on the back side of the first printed board 6 is connected to the drive coil 8aK on the front side of the second printed board 80, and the coil 8a is wound Kt1 from the outside to the inside. Then, it is connected to the back side through the through hole of the second sheet, and then connected to the third and fourth sheets in sequence.

Figure 4 is a storm improvement measure for dissipating heat generated from the printed board section shown in Figures 1 to 3 above.

When driving coils are stacked on a printed board as shown in Figure 2, heat is generated as the motor rotates, so it must be dissipated. As a solution to this problem, it is possible to interpose metal or chemical material heat dissipation sheets 18 and 20 between each printed board, and also connect a part of the heat dissipation sheets 1g-20 to the fixing yoke 14 to radiate heat. be. This sheet 18.2
0 can also improve the characteristics within the magnetic circuit by mixing magnetic powder such as ferrite.

The printed boards 6, 8, 10, and 12 are processed into disk shapes so that they can be easily stored in the motor case, and protrusions 6G, 8G, 10, and 12G are provided on the outer periphery of each printed board to drive each printed board. The position of the coil for use can be arranged parallel to the rotation axis.

FIG. 5 shows a drive circuit for the seven-wheel drive circuit shown in FIGS. 1 to 4, and the coil L1 starts from one winding conductive portion 6a on the surface of the first printed board 60, and then connects to the second and third printed boards. , further consists of a series of conductive parts up to the winding conductive part 123' on the back side of the fourth printed board, and one on the front side of the first printed board.
The two turns of conduction s6a are the first electric signal terminal ilK.
The coiled conductive portion 12a' on the back side of the fourth sheet is connected to one end of the collector of the transistor q. Furthermore, the coil L and the winding conduction portions 6b and 6C on the surface of the first printed board 60 are similar to the coil L.
Turning conduction part 12b' on the back side of the fourth printed board from
12c' and then to the power supply end and one end of the collectors of transistors Q, -Q, respectively! Continue. 16a-1
6b and 16C are Hall elements arranged on the first printed board for nine position detection.

A part of the circuit configuration shown in FIG. 5 is a well-known technique, so a description of its operation will be omitted.

61 to 8 show examples of improved heat dissipation of printed boards. FIG. 6a shows a part of a printed board with coil parts 61 formed on the front and back surfaces, and the rotation axis of the coil part 6a is The portion that contributes to the rotational action is the area indicated by the symbol Y, and the portion 20 is simply a conductive portion. By folding the conductive portion 20 between the heat dissipating member Km and the heat dissipating member Km as shown in Fig. 6, heat can be more easily dissipated.

7 and 8 show examples in which heat is radiated from a folded printed board to the fixed yoke 14 via the motor case 22, the motor cover ±4, or the heat radiating member 26.

As described above, the present invention provides winding conductive parts for forming drive coils on the front and back surfaces of a printed board by etching, etc., and connects the front and back sides of the printed board with electrically connected through-holes. By connecting them with lead wires or the like, it is possible to obtain a 9-thin motor in which the printed boards are densely stacked and a drive coil can be thinly provided in a direction parallel to the rotation axis. Furthermore, the winding conductive portion on the front surface of the printed board is wound from the outside to the inside, and the winding conductive portion on the back surface is wound from the inside to the outside, thereby allowing the winding from the back side of the printed board to the surface of the next printed board. There is no need to cross the conductive part when connecting to the conductive part, and the inconvenience and disadvantage of providing a jumper wire or the like can be eliminated.

Furthermore, the present invention improves the heat dissipation effect by bending the part of the winding conductive part on the printed board that does not contribute to the rotation of the rotating shaft and using this folded part as a heat dissipation part, and etching it as described above. The problem of heat generation occurring in the drive coil provided on the printed board used can be effectively solved.

[Brief explanation of drawings]

Fig. 1 is an exploded view of the main parts of a motor according to an embodiment of the present invention, Fig. 2 is a perspective view showing the laminated state of printed boards 6, 8, 10, and 12, and Fig. 3 shows the front and back surfaces of the printed boards. Figure #f4 is a cross-sectional view of an embodiment that radiates heat generated in the print 1fL, Il
Figure s Fi @ Figures 1 to 4 are motor drive circuit diagrams, Figures 6 a-b are explanatory diagrams of an embodiment in which heat is radiated by bending a printed board, and Figure 7 is a diagram showing another embodiment. FIG. 8 is a sectional view of a main part showing another embodiment. l... Rotating shaft, 4-... Permanent magnet, 6.8.lO.1
2... Printed board. Applicant Canon Co., Ltd.

Claims (3)

[Claims] (1) In a motor having a part of the heater consisting of a plurality of nine magnets that are fixed to a rotating shaft and magnetized separately, and a plurality of field coils arranged facing the magnets,
A plurality of printed boards are stacked, a conductive part for forming the field coil is provided on each printed board on the top and bottom sides of the printed board, and the conductive parts on the front and back sides are electrically connected. Features a motor. (2) In the motor described in item 1 above, the coil on the front surface of the first printed board is wound eight times from the outside inward in the direction of the center, and the coil on the back surface is @ wound from the inside to the outside. At the same time, from now on, the coils on the surface of the second printed board also move from the outside to the inside.
2. A motor using a printed board according to claim 1, wherein the coil on tl is wound from inside to outside. (3) In the motor according to item 1, a portion of the printed board that does not contribute to the rotational action of the conductive portion is bent;
Claim 1 characterized in that the heat dissipation effect is enhanced.
A motor using the printed board described in Section 1.