JPH0815385B2 - Brushless motor stator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a video tape recorder (hereinafter, referred to as a VTR).
The present invention relates to a stator of a flat-opposed brushless motor used in video / audio equipment such as an audio cassette tape recorder and a record player.

As a conventional stator of a brushless motor, for example,
There is a stator of a flat-opposed brushless motor such as that used in a capstan motor of a portable VTR that is commercially available. Hereinafter, the first conventional example will be described with reference to FIGS.
This will be described with reference to FIG.

FIG. 7 is a side sectional view of a first conventional example of a flat facing type 8-pole 3-phase brushless motor, and FIG. 8 is a plan view of a printed wiring board having a circuit pattern of the flat facing type brushless motor. FIG. 10 is a plan view of a stator of the flat facing brushless motor, FIG. 10 is a perspective view of a split winding coil used in the stator, and FIG. 11 is a connection diagram of the split winding coil.

In FIG. 7, a flat-opposed brushless motor 1 of this example is shown.
Is a motor shaft 10 and a disk-shaped or ring-shaped permanent magnet 5 that is fixedly held by the motor shaft 10 and rotates integrally, and is magnetized into approximately eight fan-shaped portions on the first plane portion 2. A rotor 6 including a back yoke 4 made of a magnetic material, which is in contact with and fixed to the second flat surface portion 3 of the permanent magnet 5, a first flat surface portion 2 of the permanent magnet 5, and a predetermined The printed wiring board 8 having a predetermined circuit pattern 13 facing each other with a gap, and the rotational positions of the three-phase stator winding 7 and the permanent magnet 5 provided on the printed wiring board 8 are detected. And a stator 9 including a rotational position detector (not shown) for the purpose.
The motor shaft 10 is fitted in a bearing member 12 mounted on a motor substrate 11 and is rotatably supported.

A split winding coil 7 as shown in FIG. 10, for example, is used for the stator 9 of this conventional example. The split winding coil 7 is wound so as to have a substantially fan-shaped outer shape as shown in the drawing, and has a hole 7c having the same shape as the outer shape on the inner peripheral side, or the outer shape is substantially triangular. , Trapezoidal, circular,
An ellipse or the like is used. For the conductor wire of the split winding coil 7, a so-called self-bonding wire is used, in which an insulating film such as enamel is applied to the surface of a core wire made of copper or the like, and an adhesive film is applied thereon. The coating is melted by a solvent or heating in a winding process using an appropriate jig, and the conducting wires are fused to each other during or after winding to maintain a substantially fan shape as shown in Fig. 10. To be done. Lead wires (electrodes or terminals) 7a and 7b are formed by leading out at the winding start portion and the winding end portion of the split winding coil 7. The lead wires 7a and 7b are provided at predetermined end portions of the split winding coil 7. It is formed by peeling off the insulating film and the adhesive film with the length left, and exposing the core wire to a predetermined length. The split winding coil 7
Is fixed to the printed wiring board 8 having a circuit pattern 13 as shown in FIG.
As shown in the figure, the lead wires 7a and 7b are soldered to the lead wire processing portions 13a and 13b of the circuit pattern 13, respectively, so that connection processing is performed. Incidentally, in FIG. 9, the split winding coil 7 is indicated by a chain line.

As described above, this prior art example is an 8-pole 3-phase brushless motor, and includes two split winding coils 7 (1), 7 per phase.
The divided winding coils 7 (1) and 7 (2) of U-phase, V-phase and W-phase, which are constituted by (2), are connected as shown in FIG. In FIG. 9, of the two lead wires 7a, 7b of the first split winding coil 7 (1) of each phase, one lead wire 7b is soldered to the lead wire processing portion 13b of the circuit pattern 13, The circuit patterns 13 are commonly used and collected. On the other hand, the other lead wire of the first split coil 7 (1) soldered to the lead wire processing portion 13a
7a is the second phase of each phase soldered to the lead wire processing section 13b.
Is connected to one lead wire 7b of the split winding coil 7 (2) via the circuit pattern 13. The other lead wire 7a of the second split winding coil 7 (2) of each phase is soldered and connected to the lead wire processing portion 13a of the circuit pattern 13 as an input end of each phase. A predetermined current is supplied from the terminals 13u, 13v, 13w of the circuit pattern 13 to the split winding coils 7 (1), 7 (2) of each phase connected as described above. In addition, the conventional 8-pole 3-phase brushless motor 1
In the above, the circuit pattern 13 has a total of 12 lead wire processing parts 13a and 13b.

As shown in FIG. 9, the stator 9 of the conventional brushless motor 1 configured as described above has a lead wire of the circuit pattern 13 on the printed wiring board 8 to which the lead wire 7a of the split winding coil 7 is connected. Since the processing portion 13a is formed in the hole 7c on the inner peripheral side of the split winding coil 7, the hole
The soldering work within 7c is difficult, and especially when the split winding coil 7 is small.

In order to solve the above problems, as a second conventional example, the stator of the flat opposed brushless motor shown in FIGS. 12 to 14 is used. FIG. 12 is a plan view of a printed wiring board having a circuit pattern of the plane-opposed brushless motor of the second conventional example, and FIG. 13 is a plan view of a stator of the plane-opposed brushless motor, and FIG. [Fig. 4] is a perspective view of a split winding coil used for the stator.

The brushless motor of the second conventional example is composed of 8 poles and 3 phases similarly to the brushless motor 1 of the first conventional example, and its operation is also exactly the same as that of the first conventional example. The description here is omitted. The difference from the first conventional example is that, as shown in FIG. 12, all the lead wire processing portions 15a and 15b of the circuit pattern 15 formed on the printed wiring board 14 are located on the outer peripheral side of the printed wiring board 14. And provided outside the split winding coil 17. The split winding coil 17 used in the printed wiring board 14 described above is different from the split winding coil 7 shown in FIG. 10 in that the lead wire 17b is crossed over the upper surface 17d of the split winding coil 17 as shown in FIG. This is the point that was derived.

The stator 16 configured as described above, as shown in the thirteenth, the lead wire processing portions 15a and 15b of the circuit pattern 15 to which the lead wires 17a and 17b of the split winding coil 17 in the printed wiring board 14 are connected, Since all are formed on the outside of the split winding coil 17, the drawbacks of the first conventional example can be overcome, but there are the following problems. That is, thirteenth
In the stator 16 shown in the figure, the circuit pattern 15 projects to the outer peripheral side of the printed wiring board 14 in order to avoid mutual crossing,
Because it projects outward in the radial direction of the motor,
The outer diameter of the printed wiring board 14 increases, and the motor tends to increase in size. In addition, the lead wire processing units 15a and 15b of the circuit pattern 15
At the two outer peripheral surfaces 17e of the adjacent split winding coils 17
Since it has to be provided in a substantially triangular portion 14b formed by the outer periphery 14a of the printed wiring board 14, the gap between the lead wire processing portions 15a and 15b becomes small, and the lead wires 17a and 17b are formed.
In the soldering work, there was a problem that a short circuit between them was likely to occur.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention has been made in view of the above problems, and is a stator of a brushless motor that facilitates soldering of lead wires of a split winding coil and realizes downsizing of the motor. Is provided.

Means for Solving the Problems In order to solve the above problems, the stator of the brushless motor of the present invention is a motor shaft, a fixed magnetized rotor that is fixed to the motor shaft and integrally rotates, A printed circuit board having a predetermined circuit pattern, which is provided on a printed wiring board facing the rotor and a concentric circle centered on the rotor center on the printed wiring board, and which applies a rotational force to the rotor by energization. In a brushless motor including a stator including n split winding coils, among the lead wire processing units of the split winding coil at 2n locations on the printed wiring board, n lead wire processing units are provided. Outside the split winding coil on the outer peripheral side of the printed wiring board, other n lead wire processing parts are provided on the inner circumference side of the printed wiring board on the outer side of the split winding coil. To One lead wire of each of the split winding coils is provided in the radial direction of the motor, and the other lead wire is crossed with the upper surface of the split winding coil so as to be on the same side as one of the lead wires. In addition, since it is led out toward the center side in the radial direction of the motor, the printing of the portion that intersects the end surface of the split winding coil in the motor axial direction is prevented so that the split winding coil does not tilt due to the thickness of other lead wires. The wiring board is provided with n holes.

Effect The present invention has the above-described configuration, so that the lead wire of the split winding coil can be easily soldered and the stator can be downsized.

Example Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 6. 1 is a plan view of a printed wiring board having a circuit pattern of a brushless motor according to a first embodiment of the present invention, FIG. 2 is a plan view of a stator of the brushless motor, and FIG. 3 is a plan view of the stator. It is a perspective view of the split winding coil used.

The first embodiment of the present invention is composed of 8 poles and 3 phases, and the connection of split winding coils is the same as that shown in FIG. As shown in FIG. 1, the printed wiring board 18 is basically different from the first conventional example and the second conventional example.
Six lead wire processing parts 19a of the circuit pattern 19 formed above are provided on the outer peripheral side of the printed wiring board 18 and outside the split winding coil 17, and the other six lead wire processing parts are provided. The point 19b is provided on the inner peripheral side of the printed wiring board 18 and outside the split winding coil 17. In addition, the split winding coil 21 used for the printed wiring board 18 described above.
The difference from the split winding coil 17 shown in FIG.
As shown in the figure, the lead wire 21a is led out to the outside in the radial direction of the motor, and the lead wire 21b is crossed with the upper surface 21d of the split winding coil 21 so that it is on the same side as the lead wire 21a and in the radial direction of the motor. That is, it is derived to the center side of.
As shown in FIG. 2, the split winding coil 21 (shown by a chain line) is provided on a printed wiring board 18 in a concentric circle centered on the center of the rotor of the motor.
The upper surface 21d of the 21 abuts on the surface of the printed wiring board 18 on which the circuit pattern 23 is formed, and is fixed to the printed wiring board 18 by means such as adhesion. The present invention, which is an 8-pole 3-phase brushless motor, comprises two split winding coils 21 (1), 21 (2) per phase, and each of the U-phase, V-phase and W-phase split winding coils. 21 (1) and 21 (2) are connected as shown in FIG. 11 as in the conventional example. In FIG. 2, of the two lead wires 21 a and 21 b of the first split coil 21 (1) of each phase, the lead wire 21 b led to the inner peripheral side of the printed wiring board 18 is of the circuit pattern 19. Lead wire processing unit 1
Soldered to 9b, and commonized via the front 5 circuit patterns 19. On the other hand, the other lead wire 21a of the first split winding coil 21 (1), which is led to the outer peripheral side of the printed wiring board 18 and soldered to the lead wire processing portion 19a.
Via the circuit pattern 19 to the lead wire 21b led to the inner circumference side of the printed wiring board 18 of the second split winding coil 21 (2) of each phase soldered to the lead wire processing portion 19b. Connected. In addition, the second split winding coil 21 of each phase
In (2), the other lead wire 21a led out to the outer peripheral side of the printed wiring board 18 is used as the input end of each phase as the lead wire processing unit 1
9a is soldered and connected. A predetermined current is supplied from the terminals 19u, 19v, 19w of the circuit pattern 19 to the split winding coils 21 (1), 21 (2) of the respective phases connected as described above. In the stator 20 configured as described above, the printed wiring board 18 is provided with a hole 18a for receiving the lead wire 21b intersecting the upper surface 21d of the split winding coil 21. Since the lead wire 21b enters the hole 18a and the hole 18a serves as a clearance for the lead wire 21b, the split winding coil 21 does not tilt due to the thickness of the lead wire 21b. Further, the gap between the split winding coil 21 and the rotor is closed by the inclination of the split winding coil 21.
There is no contact between the rotor and the rotor. The six lead wire processing parts 19a are formed on the outer peripheral side of the printed wiring board 18 and on two outer peripheral surfaces 21e of the adjacent divided winding coils 21 and a circle whose diameter is approximately the outer periphery of the divided winding coil 21. The lead wire processing portions 19b provided on the substantially triangular portion 18c formed on the circumference and on the other hand, the six lead wire processing portions 19b are located on the inner circumference side of the printed wiring board 18 at two locations on the adjacent divided winding coil 21. Outer peripheral surface
The lead wire processing portions 19a and 19b are not adjacent to each other because they are provided in the substantially triangular portion 18d formed by 21f and the inner peripheral portion 18b of the printed wiring board 18. Therefore, a short circuit cannot occur during the soldering work of the lead wires 21a, 21b, and the workability thereof is improved. Further, in the stator 20 of the present invention, as shown in FIG. 2, the circuit patterns 19 are projected on the outer peripheral side of the printed wiring board 18 in order to avoid mutual crossing, and projected outward in the radial direction of the motor. There is no. Therefore, the outer diameter of the printed wiring board 18 can be made smaller than the outer diameter of the printed wiring board 14 of the conventional example shown in FIG. 13, and the stator 20 can be downsized, so that the motor can be downsized. Can also be realized. Alternatively, the printed wiring board 18 may be formed by directly forming a printed wiring portion on a substrate made of a soft magnetic material with an insulating layer interposed therebetween.

FIG. 4 is a plan view of a printed wiring board having a circuit pattern of a brushless motor according to a second embodiment of the present invention, FIG. 5 is a plan view of a stator of the brushless motor, and FIG. 6 is the stator. It is a perspective view of the split winding coil used for. The main constituent elements of the brushless motor and their operations are the same as in the first embodiment. The second embodiment differs from the first embodiment in that the lead wire 25b does not cross the upper surface 25d of the split winding coil 25 as shown in FIG. Book leads 25a, 25
Both b are led out from the outside of the split winding coil 25, and the split winding coil 25 is disposed on the printed wiring board 22 and the stator 24
Is the point that was configured. On the printed wiring board 22 of the stator 24 configured as described above, the lead wire 25b of the split winding coil 25 is formed.
It is not necessary to provide an escape hole for the passage.

As described above, the stator of the brushless motor of the present invention is
A motor shaft, a fixed magnetized rotor that is fixedly attached to the motor shaft and integrally rotates, and a printed circuit board facing the rotor and the rotating circuit on the printed circuit board. A brushless motor having a stator including n split winding coils of a plurality of phases, which are provided on a concentric circle centered on the center of the child and apply a rotating force to the rotor by energization, Among the lead wire processing parts of the split winding coil at a certain position, the lead wire processing parts at the n positions are located at the outer peripheral side of the printed wiring board and outside the split winding coil, and lead wires at other n positions. Processing parts are respectively provided on the inner peripheral side of the printed wiring board and outside the split winding coil, and one lead wire of the split winding coil is led out in the radial direction of the motor and the other lead wire is provided. line By crossing the upper surface of the split winding coil and leading it to the same side as one lead wire and to the center side in the radial direction of the motor, the split winding coil tilts due to the thickness of the other lead wire. To avoid
By providing the printed wiring board at the portion where the end faces of the split winding coil in the motor axial direction intersect with each other, the printed wiring board is provided with n holes, so that a short circuit cannot occur during the soldering work in the lead wire processing portion, An excellent effect that the workability is also improved is obtained. Further, since the stator can be downsized, it is possible to obtain an excellent effect that the motor can be downsized. Further, the printed wiring board may be configured by directly forming a printed wiring part on a substrate made of a soft magnetic material via an insulating layer. Although both the first embodiment and the second embodiment are brushless motors having 8 poles and 3 phases, the present invention is not limited to this, and the same applies to brushless motors having other numbers of poles and phases. The effect is obtained.

[Brief description of drawings]

1 is a plan view of a printed wiring board of a brushless motor according to a first embodiment of the present invention, FIG. 2 is a plan view of a stator of a brushless motor according to the first embodiment of the present invention, and FIG. FIG. 4 is a perspective view of a split winding coil used for the stator, FIG. 4 is a plan view of a printed wiring board of a brushless motor according to a second embodiment of the present invention, and FIG. 5 is a view of the second embodiment of the present invention. FIG. 6 is a plan view of a stator of a brushless motor, FIG. 6 is a perspective view of a split winding coil used in the stator, FIG. 7 is a side sectional view of a first conventional planar-opposed brushless motor, and FIG. FIG. 9 is a plan view of a printed wiring board of the plane-opposed brushless motor, FIG. 9 is a plan view of a stator of the plane-opposed brushless motor, and FIG. 10 is a perspective view of a split winding coil used in the stator. The figure shows the connection diagram of the split winding coil, and Fig. 12 shows the second sub coil. FIG. 13 is a plan view of a printed wiring board of an example plane-opposed brushless motor, FIG. 13 is a plan view of a stator of the plane-opposed brushless motor, and FIG. 14 is a perspective view of a split winding coil used for the stator. . 6 ... Rotor, 10 ... Motor shaft, 18,22 ... Printed wiring board, 19,23 ... Circuit pattern, 19a, 19b, 23a, 23b ... Lead wire processing section, 20,24 ... Stator , 21,21 (1), 21 (2),
25,25 (1), 25 (2) …… Split coil, 21a, 21b, 25
a, 25b ... Lead wire.

Claims (1)

[Claims] 1. A printed wiring board having a motor shaft, a fixed magnetized rotor that is fixed to the motor shaft and rotates integrally with the motor shaft, and has a predetermined circuit pattern, and a printed wiring board facing the stator. A brushless motor comprising: a printed wiring board; and a stator that is provided on a concentric circle centered on the center of the rotor and that includes a plurality of n-phase split winding coils for applying a rotational force to the rotor when energized. Of the lead wire processing parts of the split winding coil at 2n locations on the printed wiring board, the lead wire processing portions at n locations are located on the outer peripheral side of the printed wiring board and outside the split winding coil. , Other n
A lead wire processing portion at a portion is provided on the inner peripheral side of the printed wiring board and outside the split winding coil,
One lead wire of the split winding coil is led out in the radial direction of the motor, and the other lead wire is crossed with the upper surface of the split winding coil so as to be on the same side as the one lead wire and in the radial direction of the motor. By deriving it toward the center side of
Brushless, characterized in that n holes are provided in the printed wiring board at a portion intersecting the end surface of the split winding coil in the motor axial direction so that the split winding coil does not tilt due to the thickness of another lead wire. Motor stator.