KR20020069725A - Direct Current Motor for etching - Google Patents

Abstract

PURPOSE: A three phase DC motor for etching a copper plate is provided to improve performance of a motor without using a brush, a coil, and a core by forming fine coil patterns on both sides of a printed circuit board and arranging permanent magnets on an upper portion and a lower portion of a printed circuit board to combine the permanent magnets with a rotary shaft. CONSTITUTION: A permanent magnet is installed in a coil substrate(130). The permanent magnet has a width of 12mm, a thickness of 0.8 to 1.2mm, and N/S magnetic poles of 16 to 18. The permanent magnet is connected with a rotary shaft through a penetrating hole. The permanent magnet and the rotary shaft are rotated by an electromagnetic force generated from coil patterns(A1-C6) of the coil substrate(130). A line width of the coil pattern is about 40 to 50 micro meter. An interval between the coil patterns is 45 to 55 micro meter. The coil patterns(A1-C6) are formed on the coil substrate(130) by using an etch method. A plurality of pattern connection holes(Ha1-Ha3) are formed in each center of the coil patterns(A1-C6). A connector(135) is arranged in an outer circumference of the coil substrate(130).

Description

3-phase DC motor for copper etching

The present invention relates to a three-phase DC motor, and in particular, by forming a fine coil pattern on both sides of the PCB substrate, and by placing a permanent magnet on the upper and lower parts of the PCB substrate to combine with the rotating shaft, brush, coil and core The present invention relates to a three-phase DC motor for copper etching that can implement a medium / small motor of excellent performance without using.

In general, brushless DC motors are widely used because they do not generate mechanical and electrical contacts such as commutators and brushes, and do not generate electrical and mechanical noise and have a long service life.

Recently, in order to reduce coils, a method of manufacturing a coil pattern on a printed circuit board has been developed, and Korean Utility Model Publication No. 98-34790 is one of them.

The disclosed technology has a structure of a coil pattern as shown in FIGS. 1A and 1B, which is a total of six coils 5 connected in series with two coil patterns 5 wound several times for each phase on a PCB substrate 1. Coil pattern (5) is shown, and by using such a method is to save a large amount of coil compared to the prior art.

However, since the torque characteristics of a DC motor depend on the number of windings of the coil and the magnetic energy of the permanent magnet, the actual torque and the proper torque of the motor when winding two series coils for each phase several times on one surface of the PCB as shown in FIG. Not only is it difficult to expect a constant rotational speed, it is also difficult to secure the basic performance and reliability as a motor, and the use of a soldering method (7) when the same plurality of phases are connected in series can cause troublesome work and disconnection. There was such a problem.

Accordingly, an object of the present invention is to form a fine coil pattern on both sides of the PCB substrate, and also to place a permanent magnet on the upper and lower parts of the PCB substrate and to combine with the rotating shaft, thereby excellent without using a brush, coil and core It is to provide a three-phase DC motor for copper etching that can implement a medium and small size motor.

In addition, another object of the present invention is to form a coil pattern having a line interval of several tens of micrometers by etching on both sides of the PCB substrate, and arranged so that adjacent coil patterns are applied to different phases, thereby providing a torque and excellent performance even at a small size It is to provide a three-phase DC motor for copper plate etching that can realize the rotational speed.

1a and 1b is a view showing a coil pattern structure of a DC motor according to the prior art,

2 is an exploded perspective view of the motor for copper etching according to the present invention;

3 is a view showing the appearance of the permanent magnet applied to the present invention,

4 is a perspective view showing a coil pattern according to the present invention;

FIG. 5 illustrates the coil pattern of FIG. 4 as an electric circuit.

6 is a block diagram showing a motor driving circuit applied to the present invention,

7A and 7B are waveform diagrams showing pulses at forward / reverse rotation applied to a coil pattern.

* Explanation of symbols for the main parts of the drawings

100: DC motor 110: rotating shaft

120: permanent magnet 130: coil substrate

140: motor driving circuit board 160: bearing

170: magnet cover A1 to A6: coil pattern

Ha1 to Hc3: pattern connection port

Technical means of the present invention for achieving the above object, in a brushless DC motor for forming a coil pattern on a printed circuit board: is installed adjacent to a permanent magnet formed with a plurality of magnetic poles that are coupled to the rotation axis of the motor to rotate; In addition, the coil patterns generating electromotive force by inducing mutual electromagnetic force with the permanent magnets are etched on both sides of the printed circuit board to form microscopically, and arranged to receive pulse width control signals of different phases between adjacent coil patterns. In addition, between the fine coil pattern group of the same phase formed on both sides of the printed circuit board is characterized in that connected in series through a predetermined pattern connector.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 2 is an exploded perspective view of a copper etching motor according to the present invention, and includes a rotating shaft 110, a permanent magnet 120, a coil substrate 130, a motor driving circuit 140, and housings 180 and 190.

The permanent magnet 120 is a disk shape formed with a plurality of magnetic poles (N, S), the rotating shaft 110 passes through the center of the rotation shaft 110 is coupled to each other to rotate, the coil substrate 130 is a rotating shaft A disk-shaped substrate spaced apart from the center 110 and a plurality of fine coil patterns for copper plate etching are formed on both surfaces thereof, and the motor driving circuit 140 is a disk-shaped spaced apart from the rotating shaft 110. Various electronic components for controlling the power supply supplied to the coil pattern of the coil substrate 130 are set at the upper end thereof, and the housings 180 and 190 have a cylindrical case for sealing and protecting various motor components from the external environment. 180) and the upper / lower lid 190 is made up.

In addition, the reference numeral 160 is a bearing installed between the coil substrate 130, the motor driving circuit 140, and the rotation shaft 110 to prevent the fixing and rotation of each component, the reference numeral 170 is the permanent magnet 120 of The cover blocks one side of the magnetic energy so that the magnetic energy is concentrated toward the coil substrate 130 and not reached elsewhere.

Basic specifications of the motor 100 having such a structure are shown in Table 1 below.

Input power Motor size Revolutions Torque Number of coil boards (both sides) 1 small DC 1 to 1.5V 12 * 12mm 2200-2600 rpm 1.2 to 2.5 2 (small and medium) DC 24 ~ 40V 80 ＊ 120mm 3400 ~ 4200rpm 3.4 to 4.8

As shown in Table 1, the input power, the torque and the rotation speed of the motor 100 vary according to the number of the coil substrates 130 and 130 'having the coil patterns A1 to C6 formed therein. I will explain by listening.

In addition, Figure 3 is a perspective view of the permanent magnet 120 of Figure 2, Figure 4 is a coil pattern diagram of one side formed on the coil substrate 130 of Figure 2, Figure 5 is a double side of the coil substrate 130 of Figure 4 FIG. 6 is a circuit diagram illustrating the coil pattern. FIG. 6 is a circuit block diagram illustrating the motor driving circuit 140 of FIG. 2.

Looking at this in more detail with reference to the present invention.

One permanent magnet 120, 120 'is installed on one coil substrate 130, 130', and the permanent magnet 120 applied to the present invention is a natural magnet of neodymium (NeD) material. Magnetic energy is much stronger than magnets.

The permanent magnet 120 has a disc shape, the width of which is about 12 mm, the thickness of which is about 0.8 to 1.2 mm, the magnetization of 12 to 16 N / S stimuli, and the through hole 125 formed in the center. It is coupled with the rotating shaft 110 through. Due to the electromagnetic force formed between the permanent magnet 120 and the coil patterns A1 to C6 of the coil substrate 130, a certain torque is generated, and the permanent magnet 120 rotates together with the rotation shaft 110.

As shown in FIG. 4, the coil patterns A1 to C6 that generate the permanent magnet 120 and the electromagnetic force have three coil patterns A1, A3, A5 / B1, B3, and B5 on each surface of the coil substrate 130. / C1, C3, C5) are etched, respectively. Of course, coil patterns A2, A4, A6 / B2, B4, B6 / C2, C4, and C6 having the same shape are formed on the rear surface of the coil substrate 130, which is not shown. Coil patterns A1 to C6 are formed, and are arranged to receive pulse width control signals of different phases between adjacent coil patterns.

Of course, the coil line widths of the coil patterns A1 to C6 are approximately 40 to 50 µm, and the intervals between the lines are very fine, approximately 45 to 55 µm. Thus, the fine coil patterns A1 to C6 are formed on the substrate using the semiconductor etching method.

At the center of each coil pattern A1 to C6, there are pattern connection ports Ha1 to Hc3, which electrically series each coil pattern A1 to C6 group formed on both surfaces of the coil substrate 130 by the same phase. As a hole for connecting, the inner surface of the hole is plated with gold so that each coil pattern A1 to C6 on both sides can be connected without a separate soldering process.

That is, when the coil patterns A1 to C6 are etched to the pattern connection ports Ha1 to Hc3, the coil patterns A1 to C6 are electrically connected to the coil patterns on the back surface of the coil substrate through gold plating of the pattern connection ports Ha1 to Hc3. Of course, depending on the design method, the pattern connection ports Ha1 to Hc3 may be formed between the coil patterns of the respective phases without being formed in the center of each coil pattern.

In addition, a connector 135 that receives voltages of A, B, C, and intermediate characteristics applied from the motor driving circuit 140 is disposed on the outer circumferential surface of the coil substrate 130.

That is, as shown in FIG. 5, each of the coil patterns A1 to C6 is connected to the coils A1 to A6, B1 to B6, and C1 to C6, which receive pulses of the same phase, in series, and six coil patterns for each phase. Is connected.

6 illustrates a motor driving circuit 140 according to an embodiment of the present invention, and includes a voltage converter 141, a microprocessor 145, an amplifier switch unit 147, and the like.

The voltage converting unit 141 is configured to down-convert a normal 24V to 40V power applied from the outside to a predetermined DC level and output the converted 10V and 5V voltages, respectively, and output the microprocessor 145. Is operated by receiving the voltage output from the voltage conversion unit 141 and generates the appropriate pulses of A, B and C phases according to input commands such as forward rotation, reverse rotation or stop commands input from the external key input unit 143. The amplification switching unit 147 is formed of a transistor such as an FET device for amplifying and outputting the output signals of A, B, and C output from the microprocessor 145 by a predetermined voltage level, as shown in FIGS. 7A and 7B. A square wave having the same pulse width is generated, and a square wave is applied to the coil patterns A1, B1, and C1 of each phase group to drive the motor.

FIG. 7A is a waveform diagram illustrating a square wave output output through the amplifying switching unit 147 at forward rotation, and FIG. 7B is a waveform diagram showing a square wave output output through the amplifying switching unit 147 at reverse rotation. It can be seen that the generated waveforms applied to the respective coil pattern A1, B1, C1 groups in the forward rotation and the reverse rotation are different in phase.

While specific embodiments of the present invention have been described and illustrated above, it is obvious that the present invention is not limited thereto and that other modifications and variations are possible within the scope of the claims set out below.

Therefore, in the present invention, by forming a fine coil pattern on both sides of the coil substrate and by placing a permanent magnet on the upper and lower portions of the coil substrate to be combined with the rotating shaft, excellent performance without the use of brushes, coils and cores Small and small motors can be realized, and coil patterns having a line interval of several tens of micrometers are formed by etching the coil patterns on both sides of the coil substrate, and are arranged so that different phases are applied to adjacent coil patterns. High torque and rotational speed can be achieved, and by connecting the coil pattern of the same phase on both sides in series by using gold-plated pattern connection port in the center or between each coil pattern, eliminating the separate soldering process to improve the reliability of the motor. There is an effect that can be improved.

Claims (5)

In brushless DC motors that form a coil pattern on a printed circuit board: It is installed adjacent to the permanent magnet having a plurality of magnetic poles rotated by mutual coupling with the rotation axis of the motor, induction of mutual electromagnetic force with the permanent magnet by etching the coil pattern on each side of the printed circuit board in micro units It is formed finely, and arranged to receive the pulse width control signals of different phases between adjacent coil patterns, and in series between the fine coil pattern group of the same phase formed on each side of the printed circuit board through a predetermined pattern connection port. 3-phase DC motor for copper etching. The method according to claim 1, The pattern connection port is a three-phase DC motor for copper etching, characterized in that the plating is formed to directly connect the coil pattern of the same phase formed on both sides of the printed circuit board. The method according to claim 1, The pattern connection port is formed in the center of each coil pattern, the three-phase DC motor for copper etching, characterized in that the same number of coil patterns. The method according to claim 1, And a connector to which a three-phase voltage and a voltage having an intermediate characteristic are applied to an outer circumferential surface of the printed circuit board. The method according to claim 1, The coil line width of the coil pattern is about 40 to 50㎛, the line spacing is about 45 to 55㎛ about three-phase DC motor for copper etching.