JP3433120B2 - Sensor device and brushless motor using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sensor device and a brushless motor using the same, and more particularly, to an improvement of a sensor device for detecting a rotational position and a rotational speed of the motor and a brushless motor equipped with the same.

[0002]

2. Description of the Related Art A brushless motor equipped with this type of sensor device holds a bearing 5 inside a holding cylinder 3 fixed to a stator plate 1 and has a magnetic core 7 on the outer periphery thereof, as shown in FIG. A plurality of drive coils 9 are mounted on the rotor shaft 11, and the rotor core 15 is surrounded by the drive magnet 13 fixed to the rotor case 11 so as to surround the magnetic core 7.
The position detecting magnet 17 is disposed on the outer circumference of the rotor case 11, and the position detecting sensor 19 including, for example, a magnet register (MR) element is provided on the outer side of the rotor case 11 for the stator plate. It had the structure attached to the No. 1. Reference numeral 21 in FIG.
Is a receiving plate for receiving the rotor shaft 15.

In such a brushless motor, a plurality of drive coils 9 are switched by an electronic circuit (not shown) formed on the stator plate 1 to energize the rotor case 11 to rotate the rotor case 11, while the rotor case 11 approaches each rotation. The magnetic flux of the magnet 17 is detected by the sensor 19, and this detection signal can be used as, for example, an operation timing signal.

Conventionally, as a sensor device including this sensor 19, for example, as shown in FIGS. 13A and 13B, the sensor 1 is mounted on a convex portion 23a of a holder 23 which is bent in a convex shape.
9 is attached, and it is screwed to the stator plate 1 so that it faces the outside of the rotor case 11, and the lead terminal 19a extending from the back side of the sensor 19 is bent in a crank shape (see FIG. 12). The structure of soldering to an electronic circuit (not shown) on the board 1 has been well known.

[0005]

However, in the above-mentioned sensor device, in order to fix the sensor 19 at a predetermined position of the stator plate 1 and connect it to a predetermined electronic circuit, a holder 23 bent into a convex shape is prepared. In addition to this, the sensor 19 itself needs the lead terminal 19a.

Therefore, the holder 23 and the sensor 19
It is difficult to reduce the cost for both, and it is necessary to provide the stator plate 1 with taps for the screws 25 that hold the holder 23.
The cost of the sensor device or an electronic device equipped with the sensor device, such as a brushless motor, tends to increase.

Although it is considered that the cost can be reduced by molding the holder 23 with a synthetic resin which is easy to process and relatively inexpensive, the lead terminal 19 of the sensor 19 is considered.
In many cases, a and other electronic parts are connected to the electronic circuit of the stator plate 1 by the solder reflow method.
For this reason, it is necessary to select a heat-resistant synthetic resin material that is not deformed by the heat of reflow soldering, and in the end, it tends to be expensive.

Further, the sensor 19 also has a lead terminal 19
It may be considered to use a leadless type without a, but it is necessary to devise a method of accurately fixing it at a predetermined position and easily connecting it to the electronic circuit of the stator plate 1.

In particular, in a brushless motor using this type of sensor device, it is necessary to output a reliable and stable detection signal from the sensor 19, so that it is possible to provide a structure in which a leadless type sensor can be fixed easily and inexpensively. Was wanted.

The present invention has been made to solve the above-mentioned conventional drawbacks, and an object of the present invention is to provide a sensor device which is inexpensive and small in size, has good positioning accuracy, and has a simple structure, and a brushless motor using the same. It is what

[0011]

In order to solve such a problem, a first sensor device according to the present invention has a main substrate having an insertion portion and a connection circuit pattern extending to the vicinity of the insertion portion, and the insertion portion. An auxiliary substrate having a protruding portion and an auxiliary circuit pattern to be inserted in the auxiliary substrate, the auxiliary portion having the protruding portion inserted therein, the auxiliary circuit pattern being soldered and fixed to the connection circuit pattern, and the auxiliary substrate fixed to the auxiliary substrate. A leadless sensor for converting a spatial propagation signal into an electric signal is provided, and the leadless sensor is fixed to the auxiliary substrate so as to be directly connected to the auxiliary circuit pattern.

In this sensor device, the auxiliary circuit pattern connected to at least the connection circuit pattern is formed on both surfaces of the auxiliary substrate, and the main substrate is connected to the auxiliary circuit patterns on both sides in the vicinity of the auxiliary circuit patterns. It is also possible to form a circuit pattern.

The first brushless motor according to the present invention has a stator portion having a stator plate and a driving coil, a rotor portion having a driving magnet and a position detecting magnet and rotatably supported by the stator portion. And a sensor device arranged on the outer circumference of the rotor portion to detect the magnetic flux of the position detecting magnet arranged on the stator plate to detect the rotational position of the rotor portion.

The sensor device has an insertion portion provided on the stator plate on the outer periphery of the rotor portion, a connection circuit pattern extending to the vicinity of the insertion portion, and a protrusion and an auxiliary circuit pattern inserted into the insertion portion. A holding substrate fixed by facing the rotor portion by soldering the auxiliary circuit pattern to the connection circuit pattern by inserting the protruding portion into the insertion portion, and a leadless sensor fixed to the auxiliary substrate, The leadless sensor is fixed to the auxiliary substrate so as to be directly connected to the auxiliary circuit pattern toward the rotor section.

The first brushless motor according to the present invention is related to this, and has a stator portion having a stator plate and a drive coil, a drive magnet and a speed detecting magnet, and a shaft rotatably attached to the stator portion. It comprises a supported rotor part and a sensor device arranged on the stator plate around the outer circumference of the rotor part to detect the magnetic flux of the speed detecting magnet to detect the rotational speed of the rotor part. .

Moreover, the sensor device has an insertion portion provided on the stator plate on the outer periphery of the rotor portion, a connection circuit pattern extending to the vicinity of the insertion portion, and a protruding portion and an auxiliary circuit pattern inserted into the insertion portion. And a leadless sensor fixed to the auxiliary substrate by inserting the protruding portion into the insertion portion and soldering the auxiliary circuit pattern to the connection circuit pattern to face the rotor portion and fixed. The leadless sensor is fixed to the auxiliary substrate so as to be directly connected to the auxiliary circuit pattern toward the rotor section.

A second sensor device according to the present invention comprises a main substrate having an insertion portion and a pair of connection circuit patterns extending to the vicinity of the insertion portion, an auxiliary substrate partially inserted into the insertion portion, and A coil sensor formed in a spiral shape by providing connection portions on both inner and outer ends on one surface of the auxiliary board, and the connection circuit pattern and the connection portion of the coil sensor are aligned so that The auxiliary board is inserted into the insertion portion, and the connection circuit pattern and the connection portion are formed by soldering. Further, in this configuration, according to the present invention, the auxiliary substrate may be formed of a ferromagnetic material.

The second brushless motor according to the present invention is
A stator section having a stator plate and a drive coil, a rotor section having a drive magnet and a detection magnet rotatably supported by the stator section, and a rotor section arranged on the outer circumference of the rotor section for detecting the rotor section. And a sensor device for detecting the magnetic flux of the magnet.

The sensor device includes an insertion portion provided on the stator plate on the outer periphery of the rotor portion, a pair of connection circuit patterns extending to the vicinity of the insertion portion, and an auxiliary substrate partially inserted into the insertion portion. And a coil sensor formed in a spiral shape by providing connecting portions on both inner and outer ends on one surface of the auxiliary substrate, and the connecting circuit pattern and the connecting portion of the coil sensor are aligned and the coil sensor is mounted on the rotor. The auxiliary substrate is inserted into the insertion portion so as to face the portion, and the connection circuit pattern and the connection portion are formed by soldering connection.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. The same parts as those in the conventional example are designated by the same reference numerals.

FIG. 1 is a vertical half sectional view showing a first sensor device according to the present invention together with a first brushless motor according to the present invention.

In FIG. 1, a stator plate 1 functioning as a stator case is formed by punching a ferromagnetic plate, for example, a steel plate, and a holding cylinder 3 is fixed so as to stand upright. A bearing 5 made of, for example, oilless metal is held inside the holding cylinder 3, and as the bearing 5, a ball bearing or the like is used in addition to the oilless metal.

A magnetic core 7 having a plurality of salient pole teeth 7a radially and integrally extended is fixed to the outer periphery of the holding cylinder 3, and a plurality of drive coils 9 are divided and wound around each salient pole tooth 7a. Both ends thereof are connected to an electronic circuit (not shown) formed on the stator plate 1.

The rotor case 11 is formed by processing a ferromagnetic material plate, for example, a steel plate into a cup shape.
In addition to having an annular drive magnet 13 inside a, the rotor shaft 15 is held at the center of rotation, and the rotor shaft 15 is surrounded by the drive magnet 13 at a slight distance from the outer circumference of the tip of the magnetic core 7. Is inserted into the bearing 5 and is rotatably supported by the bearing.

Then, the stator plate 2, the holding cylinder 3, the bearing 5, the magnetic core 7, the drive coil 9 and the like form the stator portion 2.
7, a rotor case 11, a drive magnet 1
3, the rotor shaft 15 and the like form a rotor portion 29. Note that one end of the rotor shaft 15 is connected to the stator plate 1
The displacement is suppressed in the axial direction by abutting against a small receiving plate 21 that is fixed by being overlapped with the other, and the other end projects from the rotor case 11.

The detection magnet 17 is used in the rotor case 1
It is formed by attaching a chip-shaped magnet to the outer side of the side wall 11a of No. 1. In addition, the detection magnet 17
Can also be formed by partially projecting the drive magnet 13 to the outside of the rotor case 11 from the part where the side wall 11a is partially removed.

A sensor device C according to the present invention is formed near the outer periphery of the side wall 11a of the rotor case 11. As shown in FIGS. 2 to 4, the sensor device C is an insulating auxiliary substrate 31 arranged outside the side wall 11a of the rotor case 11 with a slight space therebetween.
The leadless sensor 33 is attached to the auxiliary board 31 toward the side wall 11a, and the above-described stator plate 1 that supports the auxiliary board 31.

That is, the auxiliary substrate 31 is formed in a small square shape and has a rectangular protrusion 35 protruding from the center of one side 31a (lower side in the figure).
For example, four auxiliary circuit patterns 37 are provided on the side facing the side wall 11a.

Each auxiliary circuit pattern 37 has connection electrodes 37a and 37b at both ends thereof, one connection electrode 37a facing the lower side 31a on both sides of the protrusion 35, and the other connection electrode 37b at the leadless sensor 33. Are formed to be fixed to the auxiliary substrate 31 by etching or the like from the printed circuit board so as to extend to the vicinity of the four corners.

The leadless sensor 33 has a conventionally well-known, for example, a relatively flat quadrangular shape, and is composed of, for example, an MR element that detects a magnetic flux accompanying the approach of the detection magnet 17 arranged outside the side wall 11a of the rotor case 11. This chip-type magnetic sensor is fixed by soldering so that the sensitive surface faces the side wall 11a and four corners are placed on the connection electrodes 37b of the auxiliary circuit pattern 37. For the sake of convenience, illustration of the electrodes of the leadless sensor 33 and soldering of the electrodes and the connection electrodes 37b is omitted.

In the stator plate 1, a rectangular insertion hole 39 into which the protrusion 35 of the auxiliary substrate 31 is press-fitted is formed at a position corresponding to the vicinity of the outer periphery of the side wall 11a so as to penetrate along the tangential direction of the rotation locus of the side wall 11a. The auxiliary board 31 is supported by the stator plate 1 at right angles by press-fitting the protrusions 35.

That is, the stator plate 1 has the auxiliary substrate 31.
It functions as the main board in relation to the auxiliary board 3
1 is arranged in the tangential direction (see FIG. 13A) of the rotation locus of the side wall 11a of the rotor case 11.

In the vicinity of the insertion hole 39 of the stator plate 1, as shown in FIG. 4, when the protrusion 35 is press-fitted into the insertion hole 39 and the auxiliary substrate 31 is supported by the stator plate 1,
A connection circuit pattern 41 is formed to approach each connection electrode 37a of the auxiliary circuit pattern 37, and each connection electrode 37a of the auxiliary board 31 and the connection circuit pattern 41 of the stator plate 1 are soldered to each other so that the auxiliary board 31 has a stator. Board 1
It is fixed to. The symbol S in FIG. 4 is solder. same as below.

By the way, the connection circuit pattern 41 is a part of the above-mentioned electronic circuit (not shown) in the stator plate 1, and is formed by a conventionally known method such as etching of a printed circuit board.

In the brushless motor using the sensor device C as described above, the plurality of drive coils 9 are switched and energized to rotate the rotor case 11, while the rotor case 11 is rotated.
The magnetic flux of the detection magnet 17 approaching every 1 rotation is detected by the leadless sensor 33, and the detected output is used as an operation timing signal of, for example, a floppy disk drive device, as in the conventional example.

In the sensor device C according to the present invention as described above, the insertion hole 39 and the connection circuit pattern 41 extending to the vicinity are formed in the stator plate 1, and the auxiliary board 31 is projected into the insertion hole 39 by press fitting. The portion 35 and the auxiliary circuit pattern 37 are provided, the leadless sensor 33 is directly connected to the auxiliary circuit pattern 37, and is fixed to the auxiliary substrate 31, and the protrusion 35 is press-fitted into the insertion hole 39 and the stator plate 1 is connected. Circuit pattern 41 and auxiliary board 3
Since the auxiliary circuit pattern 37 of No. 1 is soldered, it is not necessary to use the bent holder 23 and the screw 25 as in the prior art, and the leadless sensor 33 can be easily fixed at a predetermined position. Both of the leadless sensors 33 are extremely inexpensive, and the structure and assembly are simple.

Moreover, the auxiliary board 31 can be easily and compactly formed by punching or the like from a general-purpose and inexpensive circuit board made of paper phenol resin, glass epoxy resin or the like having good heat resistance to solder heat by the solder reflow method. Also from this point, it is possible to secure heat resistance and reduce costs.

Further, the insertion hole 3 formed in the stator plate 1
9 and the dimensional accuracy of the protrusion 35 formed on the auxiliary substrate 31,
For example, since it can be realized with an accuracy of + -0.1 mm in the XY directions, the leadless sensor 33 can be accurately fixed at a predetermined position, and since the auxiliary substrate 31 is fixed so as to stand upright, the mounting surface is There is an advantage that it is reduced to about 1/8 of the conventional one.

On the other hand, the brushless motor according to the present invention is
The sensor device C is arranged on the stator plate 1 around the outer circumference of the rotor part 29 to detect the magnetic flux of the detection magnet 17 to detect the rotational position of the rotor part 29. And the connection circuit pattern 41 are formed, the protrusion 35 and the auxiliary circuit pattern 37 are provided on the auxiliary substrate 31, and the leadless sensor 33 is directly connected to the auxiliary circuit pattern 37.
Since the protrusion 35 is press-fitted into the insertion hole 39 and the connection circuit pattern 41 and the auxiliary circuit pattern 37 are soldered to fix the auxiliary substrate 31 to the stator plate 1 to form the sensor device C, In addition to the effect of the sensor device C itself, the leadless sensor 33 can be accurately and easily arranged at a predetermined interval with respect to the rotor case 11, and the detection signal from the leadless sensor 33 is sure and stable. Motor characteristics are stable.

Next, another embodiment of the sensor device C according to the present invention will be described with reference to FIGS.

FIG. 5 is a front view (partially shown in cross section) A and a cross-sectional view (cross section bb) B showing another embodiment of the sensor device C according to the present invention. A connection circuit pattern 43 similar to that shown in FIG. 3 is formed in the vicinity of the insertion hole 39 on the back surface side (lower surface in the figure) of the auxiliary circuit pattern 37, and the auxiliary circuit pattern 37 formed on the auxiliary substrate 31 is extended to this tip through the protrusion 35. , The connection circuit pattern 43 and the auxiliary circuit pattern 37 of the auxiliary board 31 are soldered on the back surface side of the stator plate 1.

Further, the sensor device C shown in FIG.
Compared with the above configuration, the auxiliary circuit pattern 45 is provided on the back surface of the surface of the auxiliary substrate 31 where the leadless sensor 33 is fixed, or in the vicinity of the connection electrode 37a, or in the vicinity thereof. In, the connection circuit patterns 47 approaching the auxiliary circuit pattern 45 are formed, and the auxiliary circuit patterns 37 and 45 of the auxiliary substrate 31 and the connection circuit patterns 41 and 4 of the stator plate 1 are formed.
7 is soldered. That is, both sides of the auxiliary board 31 are fixed to the stator plate 1 by soldering.

Therefore, in such a sensor device C, the support strength of the auxiliary substrate 31 with respect to the stator plate 1 is significantly improved. Since the leadless sensor 33 does not need to be connected to the auxiliary circuit pattern 45 formed on the auxiliary substrate 31, it may have at least a shape that can be soldered to the connection circuit pattern 47 of the stator plate 1. For example, it may have the same shape as each connection electrode 37a.

By the way, in the above-described sensor device C of the present invention, the protruding portion 35 of the auxiliary substrate 31 does not necessarily have to penetrate the stator plate 1, and although not shown, a blind hole-like insertion hole is formed in the stator plate 1. The auxiliary substrate 31 may be formed with a protrusion that is press-fitted into the insertion hole.

Moreover, the effect of the present invention can be achieved to some extent with a structure in which the protruding portion of the auxiliary substrate 31 is inserted into the insertion portion provided in the stator plate 1, but the auxiliary substrate 31 protrudes into the inserting portion of the stator plate 1. It is preferable to press-fit the parts from the viewpoint that the auxiliary board 31 can be temporarily fixed to the stator plate 1 before soldering and the mounting accuracy is good.

Further, in the above-described embodiment, the example in which the position detecting magnet 17 is arranged on the side wall 11a of the rotor case 11 to form the position detecting sensor structure has been described. However, although not shown, for example, the rotor case 11
On the side wall 11a of the rotor, the speed detecting magnet having N-poles and S-poles alternately magnetized in a ring is fixed, or the N-pole and the S-pole are alternately magnetized in a ring in the rotor case 11. It is also possible to form a speed detection magnet and form it as a frequency power generation (FG) signal detection sensor configuration or a motor in which the sensor device C detects the frequency or rotation speed from the change in the magnetic flux of the detection magnet.

The first sensor device of the present invention described above has been described by taking the leadless sensor 33 composed of an MR element as an example, but not limited to the MR element, such as a magnetic sensor or a photoelectric sensor, magnetism, light, etc. The present invention can be implemented by various leadless sensors that convert a signal propagating in space into an electric signal as described above, and the sensor device according to the present invention can also be configured as described below.

Next, the second sensor device according to the present invention and the second brushless motor using the same will be described.

FIG. 7 is a vertical half sectional view showing a second brushless motor using the second sensor device. In FIG. 7, a second sensor device D according to the present invention is formed near the outer periphery of the side wall 11a of the rotor case 11.

This sensor device D is, as shown in FIGS. 7 to 11, a ferromagnetic insulating auxiliary substrate 49 which is arranged on the outside of the side wall 11a of the rotor case 11 so as to be slightly spaced from it. And a coil sensor 51 formed on the side of the auxiliary substrate 49 facing the side wall 11a,
It is formed from the above-mentioned stator plate 1 that supports the auxiliary substrate 49. The other motor configurations are the same as those in FIG. 1, and thus detailed description thereof will be omitted.

As shown in FIGS. 8 to 10, the auxiliary substrate 49 is formed in a small rectangular shape and has a wide rectangular protruding portion 53 which integrally protrudes from the central portion of one side 49a (lower side in the drawing). is doing.

The coil sensor 51 includes a coil portion 55a having a spiral (spiral) shape in which a conductor is planarly formed including a region of the protruding portion 53, and a space between both roots of the protruding portion 53 inside the coil portion 55a. One of the connection electrodes 55b formed in the central portion of the
The other connection electrode 55c formed in the vicinity of the root on one side of No. 3
And a pair of connection electrodes 55b,
55c is connected to both ends of the coil part 55a as a both-ends connecting part. The illustrated coil sensor 51 is shown with its thickness omitted for the sake of clarity, except for FIG. 10.

These coil portion 55a and connection electrode 55b,
55c is formed on one surface of the auxiliary substrate 49 by a conventionally known method such as etching or printing. Except for the connection electrodes 55b and 55c, at least the coil portion 55a of the coil portion 55a and the auxiliary substrate 49 is an insulating layer 57. It is covered (see FIG. 10) and the connection electrodes 55b and 55c are exposed.

8 and 11, the illustration of the insulating layer 57 is omitted, and in FIG. 9, the insulating layer 57 is indicated by a diagonal broken line.

In the stator plate 1, a rectangular insertion hole 59 into which the protruding portion 53 of the auxiliary substrate 49 is press-fitted is formed at a position corresponding to the vicinity of the outer periphery of the side wall 11a so as to penetrate along the tangential direction of the rotation locus of the side wall 11a. The auxiliary substrate 49 is supported by press-fitting the protrusions 53 so as to partially penetrate the stator plate 1 and be orthogonal to each other.

In the stator plate 1, as shown in FIG. 9, the protruding portion 53 of the auxiliary substrate 49 is press-fitted into the insertion hole 59 to form one side 4
When 9a is brought into contact with the stator plate 1, the connection electrode 55
A pair of connection circuit patterns 61a and 61b are formed up to the vicinity of the insertion hole 59 so as to approach each other so as to be aligned with b and 55c. In FIG. 9 and FIG. 11, the connection circuit patterns 61a, 6a
The thickness of 1b is omitted.

The connection electrodes 55b and 55c and the connection circuit patterns 61a and 61b are soldered with the solder S as shown in FIG. 10, and the auxiliary substrate 49 is fixed to the stator plate 1. The connection circuit patterns 61a and 61b formed on the stator plate 1 are also formed by a conventionally known method such as etching as in the first configuration.

In the brushless motor using such a sensor device D as well, the magnetic flux of the detecting magnet 17 approaching each rotation of the rotor case 11 is detected by the coil sensor 51, and the detected output is, for example, the operation of a floppy disk drive device. The use as a timing signal is the same as in the first configuration, and the operation of rotating the rotor case 11 is also the same.

In the second sensor device D according to the present invention as described above, the insertion hole 59 and the connecting circuit patterns 61a and 61b extending to the vicinity are formed in the stator plate 1, and the insertion hole 59 is formed in the auxiliary substrate 49. Projection 5 to be pressed into
3 is formed, and a coil sensor 51 having a spiral coil portion 55a and connection electrodes 55b and 55c at both ends thereof is formed on one surface thereof, and a protruding portion 53 is provided with an insertion hole 59.
By press-fitting into the stator plate 1 with one side 49a abutting, and connecting electrodes 55b and 55c and connecting circuit patterns 61a and 61b.
Since it is soldered, the structure is much simpler and less expensive than the conventional structure using a leadless sensor such as an MR element or a chip coil, and it can be easily fixed in place and easy to assemble. Becomes

Further, the coil portion 5 of the coil sensor 51
5a has a spiral shape, and when the projecting portion 53 of the auxiliary substrate 49 is press-fitted into the insertion hole 59 to bring one side 49a into contact with the stator plate 1, the connection electrode 55 of the coil portion 55a is formed.
Since b and 55c can be led out to the outside with the connection circuit patterns 61a and 61b aligned, even if the connection electrodes 55b and 55c are arranged outside and inside the coil portion 55a, output signals from the connection circuit patterns 61a and 61b are output. The coil portion 55a having a plurality of turns can be easily formed, and the number of turns can be set arbitrarily.

Therefore, the detection signal level can be increased by increasing the number of turns, and a jumper wire or a lead wire for leading out the inner end of the coil portion 55a to the outside is not necessary. From this point as well, the configuration and assembly are easy. Is.

Although the auxiliary substrate 49 can be formed of any insulating material, it can be punched from a general-purpose and inexpensive circuit substrate made of paper phenol resin or glass epoxy resin having good heat resistance to solder heat by the solder reflow method. It is similar to the first configuration in that it can be formed easily and in a small size. However, if a ferromagnetic material is used as the auxiliary substrate 49, the magnetic flux of the detection magnet 17 can be easily concentrated, and the output signal level is significantly increased.

Further, the insertion hole 5 formed in the stator plate 1
9 and the protrusion 53 formed on the auxiliary substrate 49 can be made highly precise, and since the auxiliary substrate 49 is fixed so as to stand upright, the mounting surface is as small as about 1/8 of that of the conventional structure. it can.

On the other hand, the second brushless motor according to the present invention detects the magnetic flux of the detection magnet 17 arranged on the stator plate 1 on the outer periphery of the rotor portion 29 and detects the rotor portion 2.
The above-mentioned second sensor device D for detecting the rotational position of 9
In addition to the effect of the sensor device D itself, the coil sensor 51 can be accurately and easily arranged at a predetermined interval with respect to the rotor case 11, and the detection signal level from the coil sensor 51 can be increased. It becomes possible to stabilize the motor characteristics.

By the way, in the second sensor device D, the shape of the auxiliary substrate 49 is arbitrary and the protruding portion 53 is not essential, and the auxiliary substrate 49 is partially inserted into the insertion hole 59 of the stator plate 1. It is preferable that the structure is press-fitted, and the connection circuit patterns 61 are aligned with them.
It is sufficient to form a and 61b.

Of course, the auxiliary substrate 4 is provided with the protruding portion 53.
If one side 49a of the coil 9 is positioned so as to abut the stator plate 1, the connection electrodes 55b and 55c of the coil portion 55a will be formed.
And the connection circuit patterns 61a and 61b are easily aligned. Further, if the insertion hole 59 is formed in such a shape that the conductive stator plate 1 does not come into contact with the spiral coil portion 55a and short-circuit the spiral stator portion 55a, it is not necessary to cover the coil portion 55a with the insulating layer 57.

Although not shown, for example, only a portion of the connection circuit pattern 61a in the vicinity of the inner connection electrode 55b is projected and brought into contact with the auxiliary substrate 49, and a small amount is provided between the surface on which the coil portion 55a is formed and the stator plate 1. It is conceivable to form voids.

Further, if another non-conductive stator plate 1 is extended from the conductive stator plate to support the auxiliary substrate 49, it is not necessary to cover the coil portion 55a with the insulating layer 57 as well. Even when the non-conductive stator plate 1 is used, the detection output signal level is not lowered when the auxiliary substrate 49 is made of a ferromagnetic material.

Also in the second brushless motor, an annular speed detecting magnet is fixed or magnetized over the entire outer circumference of the rotor case 11, and the frequency at which the magnetic flux change of the detecting magnet is detected by the sensor device D. It goes without saying that it can be configured as a power generation (FG) signal detection sensor arrangement or as a motor.

The sensor can be used in various applications, and the brushless motor of the present invention also
The present invention is not limited to the above-described circumferentially-opposed configuration, and can be implemented in a surface-opposed configuration.

[0071]

As described above, in the first sensor device of the present invention, the main board is provided with the insertion portion and the connection circuit pattern extending to the vicinity of the insertion portion, and the protrusion portion inserted into the insertion portion is provided on the auxiliary substrate. And an auxiliary circuit pattern is provided, the leadless sensor is directly connected to the auxiliary circuit pattern, and is fixed to the auxiliary circuit board. The protruding portion is inserted and the auxiliary circuit pattern and the connection circuit pattern are soldered to each other. Since it is fixed to the main board, it is inexpensive, compact, has good positioning accuracy, and has a simple structure. The auxiliary circuit pattern connected to at least the connection circuit pattern is formed on both surfaces of the auxiliary board, and the connection circuit pattern extending near the auxiliary circuit pattern on both surfaces is formed on the main board to form a sensor device. Then, the fixing strength of the auxiliary substrate to the main substrate can be significantly improved. Further, the first brushless motor according to the present invention is
A stator part having a stator plate and a drive coil, a rotor part having a drive magnet and a position detecting magnet, and a sensor device arranged on the outer periphery of the rotor part are provided, and the sensor device is provided on the stator part. The insertion portion and a connection circuit pattern extending to the vicinity of the insertion portion, and a protrusion and an auxiliary circuit pattern to be inserted into the insertion portion, the protrusion is inserted into the insertion portion, and the auxiliary circuit pattern is soldered to the connection circuit pattern. It is composed of a fixed auxiliary substrate and a leadless sensor fixed to the auxiliary substrate, and the leadless sensor is fixed to the auxiliary substrate so as to be directly connected to the auxiliary circuit pattern toward the rotor section. Therefore, in addition to the effect of the sensor device itself, the position detection characteristic of the motor becomes stable. Moreover, the first brushless motor according to the present invention is related to this, the stator portion having the stator plate and the drive coil, the rotor portion having the drive magnet and the speed detecting magnet, and the stator plate at the outer periphery of the rotor portion. Since the configuration is such that the sensor device arranged in the above is provided, the speed detection characteristic of the motor is stabilized in addition to the effect of the sensor device itself. In a second sensor device according to the present invention, an insertion portion and a pair of connection circuit patterns extending to the vicinity of the insertion portion are provided on a main board, and a spiral shape having a connection portion on both inner and outer ends on one surface of an auxiliary board. Form the coil sensor formed in, insert the auxiliary board into the insertion portion so that the connection circuit pattern and the connection portion of the coil sensor are aligned, and soldered the connection circuit pattern and the connection portion, It is inexpensive, small in size and simple in construction, has good positioning accuracy, and allows the coil sensor to be easily connected to the connecting circuit pattern of the stator plate without using jumpers or lead wires, and is easy to assemble.
Further, in the second sensor device, the configuration in which the auxiliary substrate is made of a ferromagnetic material has an advantage of increasing the output signal from the coil sensor. Further, a second brushless motor according to the present invention includes a stator portion having a stator plate and a drive coil, a rotor portion having a drive magnet and a detection magnet and rotatably supported by the stator portion, and the rotor. Since it has a second sensor device which is arranged on the stator plate at the outer periphery of the part and which detects the detection magnet, in addition to the effect of the second sensor device itself, the second sensor device has a second sensor device. The sensor device can be accurately and easily arranged at a predetermined interval, the detection signal level from the second sensor device can be increased, and the motor characteristics are stabilized.

[Brief description of drawings]

FIG. 1 is a longitudinal half sectional view showing an example of a first brushless motor including a first sensor device according to the present invention.

FIG. 2 is a front view (partially shown in cross section) showing the sensor device of FIG.

FIG. 3 is an exploded perspective view of essential parts showing the sensor device of FIG. 1.

4 is a cross-sectional view showing the sensor device of FIG. 1 (IV in FIG. 2)
−IV cross section).

FIG. 5 is a front view (partially shown in cross section) A showing another embodiment of the sensor device according to the present invention and this cross section (b-).
Cross section b)) B.

FIG. 6 is a cross-sectional view showing another embodiment of the sensor device according to the present invention.

FIG. 7 is a vertical half-sectional view showing an example of an embodiment of a second brushless motor including a second sensor device according to the present invention.

FIG. 8 is a front view (partially shown in cross section) showing the sensor device of FIG.

9 is an exploded perspective view of essential parts showing the sensor device of FIG. 7. FIG.

10 is a cross-sectional view of a main part of the sensor device of FIG. 7 (see FIG.
It is a cross section between X and X in 1).

11 is a perspective view of relevant parts showing the sensor device of FIG. 7. FIG.

FIG. 12 is a vertical half sectional view showing a conventional sensor device together with a brushless motor.

13 is a plan view A and a cross-sectional view (cross section bb) showing the sensor device of FIG.

[Explanation of symbols]

1 Stator plate (main board) 3 holding cylinder 5 bearings 7 Magnetic core 7a salient pole teeth 9 Drive coil 11 rotor case 11a side wall 13 Drive magnet 15 rotor shaft 17 Position detection (for detection) magnet 19 sensors 19a Lead terminal 21 Support plate 23 Holder 23a convex part 25 screws 27 Stator part 29 Rotor part 31, 49 Auxiliary board 31a, 49a One side (lower side) 33 Leadless sensor 35, 53 Projection 37, 45 Auxiliary circuit pattern 37a, 37b, 55b, 55c Connection electrodes 39, 59 Insertion part (insertion hole) 41, 43, 47, 61a, 61b Connection circuit pattern 51 coil sensor 55a coil part 57 Insulation layer C, D sensor device S solder

Continuation of the front page (56) References JP-A-10-2945 (JP, A) JP-A-8-61977 (JP, A) JP-A-8-237909 (JP, A) JP-A-8-61977 (JP , A) Japanese Unexamined Patent Publication No. 8-247787 (JP, A) Actually developed 60-103276 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01D 5/00-5/62 G01B 7/00-7/34

Claims (3)

(57) [Claims] 1. A main substrate having an insertion portion and a connection circuit pattern extending to the vicinity of the insertion portion, and an auxiliary substrate having a protrusion portion and an auxiliary circuit pattern inserted into the insertion portion, wherein the protrusion portion is inserted. And an auxiliary substrate having the auxiliary circuit pattern soldered and fixed to the connection circuit pattern, and a leadless sensor fixed to the auxiliary substrate for converting a spatial propagation signal into an electric signal. The sensor is fixed to the auxiliary substrate so as to be directly connected to the auxiliary circuit pattern, and the auxiliary circuit pattern connected to at least the connection circuit pattern is formed on both surfaces of the auxiliary substrate. The sensor is characterized in that the connection circuit pattern extending in the vicinity of the auxiliary circuit pattern on both sides is formed in the sensor. -Device. 2. A main substrate having an insertion portion and a pair of connection circuit patterns extending to the vicinity of the insertion portion, an auxiliary substrate partially inserted into the insertion portion, and an inner side and an outer side on one side of the auxiliary substrate. And a coil sensor formed in a spiral shape with connecting portions provided at both ends, wherein the auxiliary substrate is inserted into the inserting portion so that the connecting circuit pattern and the connecting portion of the coil sensor are aligned, A sensor device in which a pattern and a connecting portion are connected by soldering. 3. A stator part having a stator plate and a drive coil, a rotor part having a drive magnet and a detection magnet rotatably supported by the stator part, and the stator plate having an outer periphery on the rotor part. A sensor device arranged to detect the magnetic flux of the detection magnet, wherein the sensor device includes a pair of insertion portions provided on the stator plate on the outer periphery of the rotor portion and a pair extending near the insertion portion. A connection circuit pattern, an auxiliary substrate that is partially inserted into the insertion portion, and a coil sensor that is formed in a spiral shape by providing connection portions at both inner and outer ends on one surface of the auxiliary substrate, The connection circuit pattern and the connection portion of the coil sensor are aligned and the coil sensor is directed toward the rotor portion. Brushless motor auxiliary substrate is inserted into the insertion portion, and the connection circuit pattern and the connection part is characterized by comprising connected soldered.