JPH02164251A - Ac motor - Google Patents

Abstract

PURPOSE:To manufacture a small thin motor by a method wherein the stator is made up of a coil such that printed patterns-on both sides of a printed substrate incorporating a magnetic sheet are electrically connected to each other by through-holes, and the rotor is made up of a permanent magnet. CONSTITUTION:A stator coil is formed in a manner that wiring patterns are printed on the both sides of two printed substrate comprising a magnetic sheet sandwiched between the substrates. Coils 6 are formed on the arm parts of the U-shaped part of the printed substrate 2 and connected in series. AC power is supplied to the coil 6, generating magnetic poles different from each other in polarity in stator magnetic pieces 1a, 1b. Between the stator magnetic pole pieces 1a, 1b, a permanent magnet 7, a rotor, is rotatably mounted on a rotary shaft 8. The permanent magnet 7 is magnetized in two or more poles, and the stator magnetic pole pieces 1a, 1b have end faces shaped complexly, giving self-starting ability and determining the direction of rotation. In this way, a thin and small product is prepared. The product is suitable for driving a fan and/or a light load.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an AC motor using a printed circuit board.

[Conventional technology]

Conventionally, a general AC motor has a coil wound around a so-called iron core, and an alternating current voltage is applied to the coil to generate an alternating magnetic field in the iron core to rotate a rotor.

[Problem to be solved by the invention]

Even if the surface area of the device is large, there is a limit to its effectiveness in cooling a circuit board housed in a certain casing unless there is some airflow inside, so a 7-amp motor was installed to force air-cool it. Due to its structure, it requires a significant increase in space. For the same reason, even in cases where extremely light load driving is required, motors with conventional structures unavoidably require more space than necessary.The present invention was made in consideration of this point. The purpose of this is to form an AC motor in an electric or electronic circuit operated by an AC power source in the minimum necessary space so that it can be used to drive a fan or light load.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a stator formed of a printed circuit board with a magnetic plate inside, a coil formed by connecting printed wiring patterns on both sides of the printed circuit board with through holes, and a permanent coil. It is equipped with a rotor formed of magnets.

[For use]

The magnetic path is formed using the printed circuit board itself containing the magnetic board as a stator, and the coil does not need to be re-wound using a printed wiring pattern.In other words, the only parts added to the circuit are the rotor and its fixed parts. By limiting the above, a simple and small-volume motor can be obtained, which can be used as a fan for increasing the cooling effect of electronic circuits or as a light-load rotational drive source.

【Example】

Examples will be explained with reference to the drawings. Figure 1 shows the basic principle, and Figure 2 shows the specific structure.The stator 4 is formed of a printed circuit board 2, and the printed circuit board 2 is made of a magnetic plate 3 made of insulating material as shown in Figure 3. As shown in FIG. 4, the printed wiring patterns 4 provided on both sides of the printed circuit board 2 are arranged with their ends facing each other, and the ends are connected to the end surface by through holes 5. A spiral coil 6 is formed by connecting the coils 6 and 6, and the same effect as that obtained by winding the coil 6 around the magnetic plate 3 in the printed circuit board 2 is obtained. In FIG. 2, opposing stator magnetic pole teeth 1 a, 1
Coils 6 are formed separately in each of the coils 6 and 6, respectively, so that these can be connected in series. The rotor 7 is formed of a permanent magnet magnetized to form NS magnetic poles, and FIG. 2 shows the simplest two-pole case. The rotor 7 is rotatably attached to a mounting plate 9 by a rotating shaft 8, and the mounting plate 9 is fixed to the printed circuit board 2. In FIG. 1, when an alternating current voltage is applied to the coil 6, the stator magnetic pole teeth 1a and 1b are set to have different polarities based on the power supply frequency (an alternating magnetic field is generated, and the stator 1 and rotor 7 The rotor 7 rotates due to attraction and repulsion. Once the rotor 7 starts rotating, it continues to rotate due to the alternating magnetic field, but due to the inertia of the rotor 7, this motor does not have self-starting ability. Therefore, As shown in FIG. 5(,) or (b), the shape of the stator magnetic pole teeth 1a, 1b is varied, and the rotor 7 is kept stationary and immobile due to the balance of forces as shown in FIG. At the same time, the shape of the stator 1 determines the direction of rotation of the rotor 7, and both FIGS. 5(a) and 5(b) rotate counterclockwise. is a specific embodiment of the present invention, in which the rotor 7 is a lightweight ferrite magnetized with two poles, and is fixed to a rotating shaft 8 and fitted into a bearing 10 made of a sintered alloy fixed to a mounting plate 9. Note that the mounting plate 9 has the center of the rotating shaft 8 aligned with the stator magnetic pole teeth 1a and 1 as shown in FIG. 5(a) or (b).
Existing on the center line of b and both fixed magnetic pole teeth 1a,
It is fixed to the printed circuit board 2 so as to be placed at an equal distance from 1b. A cap 11 is bonded to the rotor shaft 8 to prevent the rotor 7 from coming off the rotor shaft 8. Further, the coil 6 is printed and wired so that it is wound around the stator magnetic pole teeth 1 a + 1 b with 10 turns each, and both coils 6
．． Terminals 6b and 6c of 6 are connected in series, and an AC voltage of about 10cm is applied to the other terminals 6a and 6d. In the embodiment, the blades 12 are fixed to the rotor 7,
It is used as a 7T motor for cooling.

【Effect of the invention】

Since the present invention is configured as described above, it is possible to form a motor for driving a fan or a light load without increasing unnecessary space as in the conventional case, and it is possible to install the motor on a circuit board, which is extremely This has the effect of providing a fan that is thin and easy to configure.

[Brief explanation of the drawing]

Fig. 1 is a diagram of the basic principle of the present invention, Fig. tIIJ2 is a partially cutaway perspective view of an embodiment of the present invention, Fig. 3 is a partially enlarged perspective view of the stator and coil of the same above, and Fig. fj114 is the coil of the same above. 5(a) and 5(b) are explanatory diagrams of the stator magnetic pole tooth shape and rotor positional relationship, respectively.
FIG. 6 is an exploded perspective view, partially cut away, of another embodiment of the invention. 1 is a stator, 2 is a printed circuit board, 3 is a magnetic plate, 4 is a printed wiring pattern, 5 is a through hole 6 is a coil, 7
is the rotor.

Claims (1)

[Claims] (1) It includes a stator formed of a printed circuit board with a magnetic plate inside, a coil formed by connecting printed wiring patterns on both sides of the printed circuit board through through holes, and a rotor formed of a permanent magnet. An AC motor characterized by comprising: