JP2002112482A - Leads structure for electric apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide leads structure of an electric apparatus, which can reliably retains even fine leads without using adhesive. SOLUTION: This blushless motor 1 consists of a motor portion 10 and a sensor 20. Two to three power feeding heavy leads are connected to the stator coil 17 of the motor portion 10, and three to five fine wires are connected to the connector 22b of the sensor 20. The power leads 2 are led out to the outside together with the sensor leads 3 from the cutout 23a made on the sensor cover 23 after passing through the sensor 20. The five fine sensor leads 3 taken out from the cutout 23a are twisted in the twisting section S. At two positions in front and rear the twisting section S, those five fine leads are bundled using a bind wire 4a with the three heavy power leads 2 also taken out from the cut 23a, and led out to the outside. Further, a rubber bushing 25 is recommended to use to bundle the heavy leads and the fine leads.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a lead wire drawing structure in an electric device such as a brushless DC motor with a sensor, in which a plurality of lead wires having different thicknesses are drawn out of the device.

[0002]

2. Description of the Related Art FIG. 4 is a half vertical sectional side view of a brushless DC motor 1 with a sensor showing a conventional lead wire drawing structure. From the brushless DC motor 1, a thick power lead wire 2 connected to the stator coil 7 of the motor unit 10 and a sensor-side end 11a of the rotary shaft 11 for detecting rotation of the motor unit, that is, rotation of the rotary shaft 11. The thin detection lead wires 3 connected to the rotor detection board 22 of the sensor section 20 provided at the sensor section 20 are drawn out of the motor. In the figure, reference numeral 22a denotes a Hall element provided on the outer periphery of the rotor detection board 22, and 21a denotes a sensor magnet arranged at a position facing the Hall element 22a on the outer periphery of the disk 21.

[0003] These two types of lead wires 2, 3 are separately bound by binding bands 4a, 4b for each type and are drawn out of the motor. However, in the lead wire lead-out structure of FIG. 4, only the detection lead wire 3 is drawn out alone, and the binding of the detection lead wires 3 is weak, so that the retaining strength cannot be sufficiently increased. If one of the detection lead wires 3 is strongly pulled, the detection lead wire 3 may come off from the connected connector 22b.

As shown in FIG. 5, in order to improve the strength of retaining the detection lead wire 3,
A structure is known in which binding is carried out by binding bands 4a and 4b together with a thick power lead wire 2 having a strong retaining force. The lead wires 2 and 3 are bound by a binding band 4a (4b) as shown in a cross section in FIG. According to such a structure, the frictional resistance between the power lead wire 2 and the detection lead wire 3 can improve the retaining strength as compared with the case where the detection lead wire 3 is pulled out alone.

[0005]

However, when the lead wires are bundled straight as described above, the frictional resistance caused by the contact between the lead wires is not large, so that the lead wire drawing structure shown in FIG. However, it is difficult to ensure sufficient retaining strength. In particular, when the thin detection lead wire 3 enters the gap generated between the thick power lead wires 2 as shown in FIG. 6, the retaining strength becomes insufficient.

In order to obtain a sufficient binding strength with the structure shown in FIG. 5, it is necessary to bond the binding portion with an adhesive. In this case, however, the number of working steps for bonding increases and the cost increases. Occurs.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems (problems) of the prior art, and it is possible to sufficiently increase the strength of a thin lead wire to prevent the lead wire from coming off without the need for bonding. The purpose is to provide a structure.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, a lead lead-out structure according to the present invention is obtained by twisting a plurality of thin leads in a predetermined twisting section and twisting these thin leads. At least at two places before and after the twisting section are bound to a thick lead wire and drawn out. According to the above configuration, a plurality of thin lead wires are twisted and united into a thick lead wire, so that a strong retaining strength can be secured for each of the thin lead wires.

Note that a binding band can be used for binding, and it is desirable that each lead wire has more slack on the device side than the binding band on the device side. As electrical equipment,
A motor with a sensor can be used. In this case, a thin detection lead connected to the sensor may be twisted and bound to a thick power lead connected to the motor. Further, it is desirable to attach a rubber bush that bundles a thick lead wire and a thin lead wire in the twisted section.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a lead wire drawing structure of an electric device according to the present invention will be described. 1 to 3 show an embodiment in which the lead wire lead-out structure of the present invention is applied to a DC brushless motor with a sensor, FIG. 1 is a half vertical sectional side view, FIG. 2 is an enlarged view of a lead wire in a twisted section, FIG. 3 is an expanded plan view showing the structure of the binding band shown in FIG.

As shown in FIG. 1, the brushless DC motor 1 comprises a motor unit 10 located on the left side in the figure and a sensor unit 20 connected on the right side in the figure. The motor unit 10 includes a rotor 12 fixed to a rotating shaft 11 and having a magnet 12a mounted on an outer peripheral portion thereof, and a rotating shaft 1 via ball bearings 13 on both left and right sides of the rotor 12 in the drawing.
Cover 14 and rear cover 15 respectively supporting
And a stator core 16 and a three-phase stator coil 17 which are concentrically opposed to the rotor 12 with a small gap therebetween and are located in the middle of these covers and constitute a stator. The stator coil 17 is connected to three thick power lead wires 2 for power supply.

On the other hand, the sensor section 20 includes a disc 21 provided at the sensor-side end 11a of the rotating shaft 11,
And a rotor detection board 22 attached to the rear cover 15 so as to face the sensor. The periphery of the rotor detection board 22 is covered by a cup-shaped sensor cover 23. A sensor magnet 21 a is attached to the outer peripheral edge of the disk 21,
On the other hand, the sensor magnet 2 of the rotor detection board 22
A plurality of Hall elements 22a are provided along the circumferential direction at positions opposing 1a. A connector 22b for outputting a signal from the Hall element 22a to the outside is attached to the rotor detection board 22, and a plurality of (for example, five) thin detection lead wires 3 are attached to the connector 22b. It is connected.

When power is externally supplied to the stator coil 17 of the motor unit 10 via the power lead wire 2, the rotor 12 and thus the rotating shaft 11 rotate. The rotation of the rotating shaft 11 is performed each time the sensor magnet 21 a attached to the disk 21 attached to the sensor side end 11 a of the rotating shaft 11 passes over the Hall element 22 a provided on the rotor detection board 22. Is detected as a rotation signal by each Hall element 22a, and the rotation signal is output to the outside via the detection lead wire 3.

The power lead wire 2 is connected to the rear cover 15.
Is led into the sensor section 20 through the through hole 15a formed therein, and is led out together with the detection lead wire 3 through a notch 23a formed in the sensor cover 23.
The outside of the notch 23a is covered with a cap 24. The cap 24 has an F-shaped cross section, and includes a cap body 24a that covers the cutout portion 23a and opens to the left in the figure, and a partition plate 24b that partitions the space inside the body into the left and right sides in the figure. ing. Partition plate 24
At the center of b, a through hole for passing each of the lead wires 2 and 3 is formed.

As shown in FIG. 1 and FIG. 2, which is a view from the direction of the arrow A in FIG. 1, the five thin detecting lead wires 3 drawn out from the notch 23a have a predetermined twist. Twisted in the section S, the binding bands 4a, 4a and 4b are respectively connected to three thick power lead wires 2 drawn out from the notch 23a at two places before and after the torsion section S.
b.

The bound lead wires 2 and 3 are connected to the cap 2
4 through the partition plate 24b of FIG.
It is bundled by a rubber bush 25 on the left side in the figure from the partition plate 24b in the space covered by the cap 24. The rubber bush 25 has a function of flexibly fixing a lead wire twisted by its elasticity.

The binding band 4a farther from the device is fixed to the lead wire outside the cap 24, and the binding band 4b closer to the device is fixed to the lead wire inside the partition plate 24b. Therefore, when one of the lead wires is pulled from the outside, the binding band 4b comes into contact with the partition plate 24b and functions as a stopper, so that it is possible to prevent the lead wires 2 and 3 from being pulled out further. Also, lead wires 2, 3
Has slack on the device side further than the device-side tying band 4b as shown in FIG. 1, and even when the lead wire is pulled out as described above, the stator coil 17 and the connector 22b are Stress can be prevented.

As shown in FIG. 3, for example, the binding band 4a has a flat belt 41 having a plurality of recesses formed on a surface thereof extending in a direction perpendicular to the longitudinal direction, and is fixed to a base end of the flat belt 41. The flat lead 41 is used to wind the lead wire, and the leading end is inserted into the mounting portion 42 and engaged with the claw formed inside, whereby the lead wire can be bound. . As such a binding band, for example, “Insrock Tie T18S” manufactured by Taiton Corporation can be used.

By twisting the thin lead wire 3 as described above, even if one of the thin lead wires 3 is pulled from the outside, the tensile force is dispersed to all of the five thin lead wires, and the pulling is performed. It is possible to prevent the tensile force from being concentrated on the single thin lead wire. Furthermore, since the thin lead wire 3 is bound to the thick lead wire 2 by the binding bands 4a and 4b in the twisted state, the thin lead wire does not enter the gap between the thick lead wires unlike the related art. The frictional resistance between the thin lead wire 3 and the thick lead wire 2 can be sufficiently increased. Therefore, the tensile force for one lead wire can be distributed to all the lead wires, and sufficient retaining strength can be secured.

[0020]

As described above, the lead-out structure for electrical equipment of the present invention is constructed as described above, and has the following excellent effects. (1) As described in claim 1, by twisting a plurality of thin lead wires in a predetermined twist section, and binding the twisted thin lead wires to a thick lead wire at least at two places before and after the twist section. Multiple thin lead wires can be integrated and fixed to a thick lead wire, making the frictional resistance between the thin and thick lead wires sufficiently large, and a strong retaining strength for each of the thin lead wires Can be secured.

(2) By using the binding band, the binding can be easily performed.
In addition, by making each lead wire more slack on the device side than the tie band on the device side, if the lead wire is pulled out from the outside and pulled out, the tensile force will directly apply stress to the connection inside the device. Can be prevented. (3) As described in claim 3, when a motor with a sensor is used as the electric device, a thin detection lead connected to the sensor is twisted and bound to a thick power lead connected to the motor. By doing so, it is possible to improve the strength of retaining the detection lead wire. (4) By attaching a rubber bush that bundles a thick lead wire and a thin lead wire to the twisted section, the thin lead wire can be flexibly fixed in a twisted state.

[Brief description of the drawings]

FIG. 1 is a half vertical sectional side view of a brushless DC motor having a lead wire lead-out structure according to an embodiment of the present invention.

2 is an enlarged view of the binding portion of the lead wire shown in FIG. 1 as viewed from the direction of arrow A in FIG. 1;

FIG. 3 is an expanded plan view showing the binding band shown in FIG. 1;

FIG. 4 is a half vertical sectional side view of a brushless DC motor having a conventional lead wire drawing structure.

FIG. 5 is an explanatory view of a main part showing another conventional lead wire drawing structure.

FIG. 6 is a cross-sectional view showing a binding portion of the lead wire drawing structure shown in FIG.

[Explanation of symbols]

 1: brushless DC motor 2: power lead wire 3: detection lead wire 4a, 4b: binding band 10: motor section 11: rotating shaft 12: rotor 14: front cover 15: rear cover 16: stator core 17: stator coil 20 : Sensor part 21: Disk 22: Rotor detection board 23: Sensor cover 24: Cap 25: Rubber bush

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) H05K 7/00 H05K 7/00 PDF term (Reference) 4E352 AA02 AA03 AA05 AA14 BB06 CC02 CC33 CC40 CC56 DD11 DR07 DR40 GG10 GG16 5H019 AA10 BB01 BB02 BB05 BB15 BB19 CC03 CC07 FF01 5H603 AA03 AA09 BB01 BB04 BB10 BB12 CA01 CA05 CB04 CB19 CB20 CE01 EE08 5H604 AA05 AA08 BB01 BB07 AQ15 BB07 CC05 CCB CC EC04 GG21

Claims (4)

[Claims] 1. A lead wire drawing structure for drawing two types of lead wires having different thicknesses from an electric device to the outside of the device, wherein the plurality of thin leads are twisted in a predetermined twisting section, and the thin leads are twisted together. At least at two places before and after the twisting section to be bound and drawn out with a thick lead wire. 2. The thin lead wire is bound to the thick lead wire at the two places by a binding band, and each of the lead wires has more slack on the device side than the binding band on the device side. The lead-out structure for an electric device according to claim 1, wherein 3. The electric device is a motor with a sensor, wherein a thin detection lead connected to the sensor is twisted and bound to a thick power lead connected to the motor. Item 3. A lead wire drawing structure for an electric device according to item 1 or 2. 4. The lead wire for an electric device according to claim 1, wherein a rubber bush for binding the thick lead wire and the thin lead wire is attached to the twisted section. Drawer structure.