JP2001275310A - Small-sized motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low-cost, small-sized motor. SOLUTION: A drive circuit mounting part where components like a motor drive IC, etc., are arranged, and a rotor position detector mounting part where a Hall element or coil terminal wire soldering land, etc., are arranged are formed by the use of a resin board or iron board. A drive circuit board on which the motor drive IC, etc., are arranged, and a rotor position detector board on which the Hall element or coil terminal wire soldering land, etc., are arranged are connected into a body with a flat cable, and fitted to a housing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small motor having a built-in drive circuit unit for rotating a motor.

[0002]

2. Description of the Related Art FIGS. 1 and 2 show a conventional example of a small motor incorporating a drive circuit unit. Components such as a motor drive IC 3 that generates heat by driving a motor are provided on a drive circuit mounting portion 2 of a flexible substrate 1 having a substantially symmetrical shape. In addition, the flexible substrate 1
On the rotor position detector mounting portion 4, a Hall element 5 or a coil terminal wire soldering land 6 and the like are arranged to form a drive circuit unit 7. Then, the drive circuit unit 7 moves the bent portion 8 of the flexible substrate 1 to 1
It is bent by 80 degrees and is adhesively fixed to a housing 9 for mounting the drive circuit unit 7.

The housing 9 and the rear lid 10 for sealing the motor are integrally fixed by a plurality of screws 11. The housing 9 is provided with a thrust bearing 12 for supporting axial movement, and a non-output shaft-side bearing 14 for supporting the shaft 13 and a winding 15 for generating a torque when energized. The fixed core 16 is bonded or press-fitted and fixed to form a stator unit 17.

The motor shown in FIG. 1 is an outer rotor type brushless motor, and a rotor yoke 1 which forms a magnetic path with a magnet 18 for generating torque is provided around an outer periphery of a core 16.
9 are provided. The shaft 13 is press-fitted and fixed to the rotor yoke 19 to form a rotor unit 20. Further, the rotor unit 20 is disposed on the stator unit 17.

[0005] A motor case 21 having a drum shape with one end open is provided with an output shaft side bearing 22 for supporting the shaft 13.
Are press-fitted and fixed, and a washer 23 for supporting axial movement is provided between the output side bearing 22 and the rotor unit 20.
Are arranged. Then, the rear lid 10 constituted by the stator unit 17 and the motor case 21 are fixed by caulking or the like, and a small motor incorporating the drive circuit unit 7 is constituted.

[0006]

However, the drive circuit unit in this structure is constituted by a flexible substrate, and the cost of the substrate and the cost of the die are lower than those of the resin substrate or the iron substrate. Was high.

Accordingly, it is an object of the present invention to provide a low-cost small motor.

[0008]

In order to achieve the above-mentioned object, the present invention provides a driving circuit mounting part on which components such as a motor driving IC are provided, a hall element, or a coil terminal wire soldering land. The mounting portion of the rotor position detector on which the motor drive IC and the like are mounted is formed of a resin substrate or an iron substrate, and a hall element or a coil terminal wire soldering land is provided. By adopting a structure in which the rotor position detection circuit board provided with the components and the like is integrally connected by a flat cable and attached to the housing, the cost for the board and the cost for the mold can be reduced.

[0009]

3 and 4 show a small motor according to an embodiment of the present invention. Parts such as a motor drive IC 3 that generates heat by driving a motor are disposed on a drive circuit board 24 made of a resin substrate or an iron substrate. The rotor element detecting circuit board 25 made of a resin substrate or an iron substrate is provided with a hall element 5, a coil terminal wire soldering land 6, and the like. The drive circuit board 24 and the rotor position detection circuit board 25 are integrally connected by a flat cable 26 by heat welding or soldering to form the drive circuit unit 7. Then, the drive circuit unit 7 bends the flat cable 26 at the bending portion 8 by 180 degrees,
Housing 9 for mounting drive circuit unit 7
Are fixed integrally with a plurality of screws 11.

A rear cover 10, a thrust receiver 12, a shaft 13, a non-output side bearing 14, and a winding 1 showing other portions.
5, core 16, stator unit 17, magnet 1
8, the rotor yoke 19, the rotor unit 20, the motor case 21, the output shaft side bearing 22, and the washer 23 are the same as those in the above-described conventional example and FIG.

[0011]

As described above, according to the present invention,
The drive circuit mounting part where the motor drive IC and the like are disposed and the rotor position detector mounting part where the Hall element or the coil terminal wire soldering land and the like are disposed are made of a resin substrate or an iron substrate. A drive circuit board on which the motor drive IC and the like are mounted, and a rotor position detection circuit board on which the Hall elements or the coil terminal wire soldering lands and the like are disposed are integrally connected by a flat cable, and a housing is provided. By adopting a structure for mounting on a small motor, a small motor with reduced board and mold costs is realized.

Further, as shown in FIG.
4 and the rotor position detection circuit board 25 have the same shape, so that the mold can be shared, so that a small-sized motor with a further reduced mold cost can be obtained.

Further, as shown in FIG. 4, by using a resin substrate as the material of the rotor position detection circuit board 25, it is possible to obtain a small motor in which the cost for the substrate and the cost for the mold are reduced as compared with the iron substrate.

Further, referring to FIG.
By using an iron substrate as the material, a small motor with good heat radiation of the motor drive IC 3 can be obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a conventional structure.

FIG. 2 is a plan view showing a drive circuit unit in FIG. 1;

FIG. 3 is a sectional view of an embodiment of a small motor to which the present invention is applied.

FIG. 4 is a plan view showing a drive circuit unit in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flexible board 2 Real part of drive circuit 3 Motor drive IC 4 Rotor position detector mounting part 5 Hall element 6 Coil terminal wire soldering land 7 Drive circuit unit 8 Bending part 9 Housing 10 Rear lid 11 Screw 12 Thrust receiver 13 Axis 14 Counter Output shaft side bearing 15 Winding 16 Core 17 Stator unit 18 Magnet 19 Rotor yoke 20 Rotor unit 21 Motor case 22 Output shaft side bearing 23 Washer 24 Drive circuit board 25 Rotor position detection circuit board 26 Flat cable

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference)

Claims (4)

[Claims] 1. A small motor having a drive circuit unit for rotationally driving a motor and a housing for mounting the drive circuit unit, wherein a motor drive IC is provided.
The drive circuit mounting part where components such as
Alternatively, a flat cable is used to form a drive circuit board, which is made of an iron board and on which the motor drive IC and the like are arranged, and a rotor position detection circuit board on which the hall elements or the coil terminal wire soldering lands are arranged. A small motor which is integrally connected to the housing and attached to the housing. 2. The small motor according to claim 1, wherein the drive circuit board and the rotor position detection board have the same shape. 3. The small motor according to claim 1, wherein a material of the rotor position detection circuit board is a resin board. 4. The small motor according to claim 1, wherein the material of the drive circuit board is an iron board.