JPH07336986A - Motor with frequency generator - Google Patents

Abstract

PURPOSE:To provide a magnetic disc driver which has a pattern for generating frequencies and a pattern for detecting positions and which can generates a noise-free signal. CONSTITUTION:This is a motor with a frequency generator which has a coil pattern for generating frequencies 2 which is so located as to face a driving magnet and which has lead wires at its ends and a coil pattern for detecting positions 3 which reacts to a magnetized section for detecting positions of the driving magnet and generates a position detecting signal and which has lead wires at its ends. The lead wires of the coil pattern for generating frequencies are laid upon each other in the axis direction through an insulating layer 4. The lead wires of the coil pattern for detecting positions 3 and a part of the coil pattern for detecting positions are laid upon each other in the axis direction through the insulating layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency generator-equipped motor, and more particularly to the structure of a frequency power generation coil pattern and a position detection coil pattern.

[0002]

2. Description of the Related Art Some motors with a frequency generator incorporate a frequency generator and a rotational position detecting device for detecting the rotational speed and the rotational reference position. An example of such a frequency generator and a rotation detection device will be described with reference to the drawings. In FIG. 3, a hole through which a rotating shaft (not shown) is inserted is formed on the circuit board of the motor with frequency generator, and the coil pattern for frequency power generation (about the entire circumference is formed on the outer periphery of this hole). Hereinafter, the “FG pattern”) 23 is formed. The FG pattern 23 is composed of a plurality of power generation units 23a extending in the radial direction and a coupling unit 23b connected to both ends of each power generation unit 23a.
The inner peripheral side end of a is connected to the inner peripheral side end of another adjacent power generation unit 23a, and the outer peripheral side end of each power generation unit 23a is adjacent to another adjacent power generation unit 23a. It is connected to the end on the outer peripheral side. Both ends of the FG pattern 23 are led out to the outside of the circuit board as lead portions 23c and 23c ', and the lead portion 23c is connected to the terminal 26 and the lead portion 23.
c'is connected to the terminals 25, respectively.

A position detecting coil pattern (hereinafter referred to as "PG pattern") 22 is formed on a part of the outer peripheral side of the FG pattern 23. The PG pattern 22 is FG
A plurality of power generation units 22 extending in the radial direction similarly to the pattern 23
a and a plurality of connecting parts 22b connected to both ends of these power generating parts 22a. However, the PG pattern 22 is formed in a very limited range as compared with the FG pattern 23. The power generating parts 22a on both sides of the plurality of power generating parts 22a are drawn out to the outside as the drawing parts 22c and 22c ', and the drawing part 22c is connected to the terminal 24 and the drawing part 22c.
c'is connected to the terminals 25, respectively. Further, the other power generating section 22a located inside is connected to the inner peripheral side end of another adjacent power generating section 22a, the inner peripheral side end of which is connected,
Furthermore, the end on the outer peripheral side is connected to the end on the outer peripheral side of another adjacent power generation unit 23a.

A ring-shaped magnet 21 is arranged opposite to the FG pattern 23 and the PG pattern 22 as described above. The magnet 21 is divided into a plurality of magnetic poles,
A frequency generator is configured by facing the FG pattern 23. Further, in a specific magnetic pole among a plurality of magnetic poles formed in the magnet 21, a position detecting magnetized portion having an area smaller than that of one magnetic pole and having a magnetic pole opposite to the surrounding magnetic pole is formed, The position detecting magnetized portion and the PG pattern 22 face each other to form a rotation detecting device.

[0005]

According to the motor with frequency generator having the rotation detecting device and the frequency generator as described above, the portion not related to signal power generation, that is, the lead wire 23c in the FG pattern 23. , 23c ', and in the case of the PG pattern 22, the leader lines 22c, 22c' generate noise, which causes a decrease in the S / N ratio. In order to suppress the generation of such noise, the leader lines 23c and 23c 'of the FG pattern 23 and the leader lines 22c and 22c' of the PG pattern 22 are formed in the same shape and arranged as close to each other as possible. Then, the phases of the noises are opposite to each other, so that the noises are canceled and cancelled.

However, there is a limit to the pattern intervals that can be brought close to each other, and it is impossible to bring the lead lines close to each other so that noise can be completely canceled. In addition, since the ends of each pattern do not have a perfect 180-degree opposite phase, noise that cannot be canceled remains.

The present invention has been made to solve the above-mentioned problems of the prior art, and provides a motor with a frequency generator having an FG pattern and a PG pattern capable of generating a noise-free signal. The purpose is to do.

[0008]

The invention according to claim 1 is
A drive magnet that is magnetized alternately with N poles and S poles and rotates integrally with the rotating body, and at least one magnetic pole of the drive magnet has a smaller area than the magnetic pole and is attached to the opposite magnetic pole of the surrounding magnetic pole. A position detecting signal is generated in response to the magnetized position detecting magnetized portion, a frequency power generation coil pattern that is arranged to face the drive magnet and has a lead wire at the end, and a position detecting magnetizing portion. In addition, in a motor with a frequency generator equipped with a position detection coil pattern having a lead wire at the end, the lead wires of the frequency generator coil pattern must be axially stacked with an insulating layer in between. Is characterized by. The invention according to claim 2 is characterized in that the lead wire of the position detecting coil pattern and a part of the position detecting coil pattern are axially overlapped with each other via an insulating layer.

[0009]

The leader lines at both ends of the frequency generator coil pattern are overlapped in the axial direction, so that the two leader lines have the same magnetic flux and the generated noise amounts are the same. However, one of the leader lines that are provided in a pile has a phase completely opposite to that of the other leader line, so that the generated noises cancel each other out.

Since a part of the position detecting coil pattern and a part of the lead wire of the position detecting coil pattern are overlapped in the axial direction, the magnetic fluxes are the same and the generated noise amounts are the same. However, since the lead wires that are provided in a double phase have a completely opposite phase with respect to a part of the position detecting coil pattern, the generated noises cancel each other out.

[0011]

Embodiments of the FG pattern and PG pattern of the motor with frequency generator according to the present invention will be described below with reference to the drawings. 1 and 2, the circuit board 1 is formed with a hole 1a through which a rotating shaft (not shown) is inserted. A terminal portion 1b for inputting and outputting various signals for motor control is formed at one location on the outer peripheral side of the circuit board 1. A pattern 8, a pattern 7, and a pattern 6 as lead lines are formed on a portion of the circuit board 1 on the side of the terminal portion 1b, and one end of each of the pattern 8, the pattern 7, and the pattern 6 extends from the portion of the terminal portion 1b. It is pulled out to become the terminal 8a, the terminal 7a, and the terminal 6a.

An insulating layer 4 is formed on the upper surface of the circuit board 1 having the patterns 8, 7, and 6 as described above by printing or the like. The FG pattern 2 is formed on the inner peripheral edge of the insulating layer 4. The FG pattern 2 has a plurality of power generation portions 2a formed in a radial pattern in the radial direction.
And a plurality of connecting portions 2b that connect the end portions of each power generating portion 2a. The inner peripheral side end of the power generating section 2a is connected to the inner peripheral side end of another adjacent power generating section 2a by a connecting portion 2b. The outer diameter side end of the power generation section 2a is connected to the outer diameter side end of another adjacent power generation section 2a by a connecting portion 2b. Therefore, the FG pattern 2 has a rectangular wave shape as a whole and is arranged in a circular shape.

One end of the FG pattern 2 is connected to the land 10 formed on the insulating layer 4. The land 10 penetrates the insulating layer 4 and is exposed on the back surface side, and is connected to one end of the pattern 8 formed on the circuit board 1. on the other hand,
The other end of the FG pattern 2 is a pull-out portion 2 that is pulled out to the outer peripheral side.
The leading portion 2c is connected to the land 9 formed on the insulating layer 4. Similarly to the land 10, the land 9 also penetrates the insulating layer 4 and is exposed on the back surface side, and is connected to one end of the pattern 7 formed on the circuit board 1.

On the outer peripheral side of the FG pattern 2 on the insulating layer 4, the PG pattern 3 is provided at a position adjacent to the terminal portion 1b.
Are formed. The PG pattern 3 is also composed of a plurality of power generating units 3a extending in the radial direction and a connecting unit 3b connected to the end of each power generating unit 3a. However, the PG pattern 3 is formed in a much narrower range than the FG pattern 2. The inner diameter side end of each power generation unit 3a is connected to the inner diameter side end of another adjacent power generation unit 3a, and the outer diameter side end of each power generation unit 3a is connected to another adjacent power generation unit. It is connected to the outer diameter side end of 3a. Therefore, the PG pattern 3 has a rectangular wave shape as a whole.

One end of the PG pattern 3 is connected to the land 9 formed on the insulating layer 4. The other end of the PG pattern 3 is connected to the land 11 formed on the insulating layer 4. The land 11 also penetrates the insulating layer 4 and is exposed on the back surface side, and is connected to one end of the pattern 6 formed on the circuit board 1.

According to the FG pattern 2 having the above structure, as shown in FIG. 1, the pattern 8 on the circuit board 1 which is also a lead-out line to the outside of the FG pattern 2 connected to one end of the FG pattern 2. And the lead-out portion 2c formed at the other end of the FG pattern 2 has a form in which they are overlapped with each other in the axial direction with the insulating layer 4 interposed therebetween, and moreover, the shape and the position are the same and are completely formed. Are stacked on top of each other. Therefore, the pattern 8 that is stacked with the insulating layer 4 in between,
The magnetic flux passing through the lead-out portion 2c becomes the same amount, and moreover, the same amount of noise occurs in the pattern 8 and the lead-out portion 2c. However, since both ends of the FG pattern 2 are overlapped with each other, the pattern 8 has a completely opposite phase with respect to the other lead-out portion 2c, and the noises generated in the pattern 8 and the lead-out wire 2c can be offset each other. Therefore, it is possible to obtain a frequency power generation signal having no noise component.

Also in the PG pattern 3, the terminal 1
The pattern 6 connected to one end of the PG pattern 3 by 1 is a leader line of the PG pattern 3, and the pattern 6 and the connecting portion 3b formed on the outer peripheral side of the PG pattern 3 form the insulating layer 4. It has a form such that it is sandwiched between and stacked in the axial direction. Therefore, the magnetic flux passing through the outer peripheral side connecting portion 3b and the pattern 6 is the same amount, and the amount of generated noise is also the same between the outer peripheral side connecting portion 3b and the pattern 6. However, since the connecting portion 3b on the outer peripheral side and the pattern 6 are axially overlapped with each other with the insulating layer interposed therebetween, the connecting portion on the outer peripheral side and the pattern 6 are in completely opposite phases to each other, and therefore, in both of these portions. The generated noises can be canceled by each other, and a position detection signal having no noise component can be obtained.

In the circuit board 1 as described above, the insulating layer 4 is formed by printing, and the FG pattern 2 and the PG pattern 3 are formed on the insulating layer 4 by pattern printing. However, the present invention is not limited to this, and for example, the PG pattern 2 and the FG pattern 3 are formed in advance on the flexible printed circuit board, and such flexible printed circuit board is formed with the pattern 8, the pattern 7, and the pattern 6. Alternatively, the circuit board 1 may be attached to the circuit board 1.

[0019]

According to the present invention, since the lead wires of the coil pattern for the frequency generator are axially overlapped with each other through the insulating layer, the two lead wires have the same amount of noise, and The phase of the other lead wire is completely opposite to that of the other lead wire, and the generated noises cancel each other out, and a noise-free frequency power generation signal can be obtained. Further, even if the lead wire of the position detection coil pattern and a part of the position detection coil pattern are overlapped in the axial direction with the insulating layer interposed therebetween, the phase of the part of the coil pattern and the lead wire are completely opposite. Therefore, the generated noises cancel each other out, and a noise-free position detection signal can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a circuit board of a motor with a frequency generator according to the present invention.

FIG. 2 is a perspective view of the same.

FIG. 3 is a plan view showing an example of a conventional frequency generator of a motor with a frequency generator and a position detection device.

[Explanation of symbols]

 2 Coil pattern for frequency power generation 3 Coil pattern for position detection 4 Insulation layer 7 Lead wire 8 Lead wire

Claims (2)

[Claims] 1. A drive magnet having N and S poles alternately magnetized to rotate integrally with a rotating body, and at least one magnetic pole of the drive magnet has an area smaller than that of the magnetic pole, and further, A position detecting magnetized portion that is magnetized to a magnetic pole and a reverse pole, a frequency power generation coil pattern that is disposed so as to face the drive magnet and has a lead wire at an end, and a position detecting magnetized portion that is sensitive to the position detecting magnetized portion. In addition to generating a position detection signal, a frequency generator-equipped motor having a position detection coil pattern having a lead wire at an end thereof, the lead wires of the frequency generator coil pattern are connected to each other via an insulating layer. A motor with a frequency generator characterized in that the motors are installed in parallel with each other. 2. The frequency generator according to claim 1, wherein a lead wire of the position detecting coil pattern and a part of the position detecting coil pattern are axially overlapped with each other with an insulating layer interposed therebetween. motor.