JP3286336B2 - Motor manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a motor, and more particularly to an improvement in a method for manufacturing, for example, a brushless motor having a circuit board on which a frequency power generation pattern is formed.

[0002]

2. Description of the Related Art Conventionally, as a brushless motor, FIG.
As shown in FIG. 1, a pair of ball bearings 5a and 5b are coaxially fixed to the hollow
Is rotatably supported, the circuit board 9 is fixed to the outer peripheral step portion of the fixed cylinder 1 so as to be fitted thereto, and the magnetic core 11 is fixed to the fixed cylinder 1 above the circuit board 9 and the drive coil 1 is fixed.
3, a cup-shaped rotor yoke 17 is fixed to a rotor shaft 7 protruding from the fixed cylinder 1 via a bush 15, and an annular main magnet 1 is provided inside the rotor yoke 17.
There is known a configuration in which 9 is attached so as to face the tip of the magnetic core 11.

[0005] As shown in FIG. 5, the circuit board 9 has a frequency power generation pattern 21 which is folded in a rectangular shape at a position facing the main magnet 19 in an annular shape.

However, in this type of brushless motor, it is desired that the main magnet 19 and the frequency power generation pattern 21 have a concentric positional relationship in order to maintain good motor characteristics such as wow and flutter characteristics. Therefore, it is necessary to accurately position and fix the circuit board 9 with respect to the main magnet 19.

For this reason, a precise through-hole 23 is punched and formed in the circuit board 9 inside the frequency power generation pattern 21,
The through-hole 23 is positioned by fitting it into the outer periphery of the fixed cylinder 1.

[0006]

However, the accuracy of the through hole 23 formed by punching the circuit board 9 is about 0.2.
mm, there is a limit in improving the positioning accuracy, and particularly in the case of configuring a very small motor, the positional relationship accuracy of the concentric circle state between the main magnet 19 and the frequency power generation pattern 21 is reduced. It is difficult to maintain good characteristics of the motor.

The present invention has been made to solve such a conventional disadvantage, and an object of the present invention is to provide a method of manufacturing a motor capable of easily positioning a circuit board disposed on a stator side accurately.

[0008]

According to the present invention, a rotor having a magnet is rotatably supported on a stator side, and electric power is generated by displacement of the magnet accompanying rotation of the rotor. A manufacturing method for a motor in which a circuit board having a sensor pattern for inducing a signal is supported on a stator side in opposition to a rotor, a positioning pattern is formed on the circuit board, and an insertion hole is formed at a predetermined position of the positioning pattern. After forming
The motor is manufactured by supporting the circuit board on the souter side by inserting the positioning pins provided on the stator side into the insertion holes.

[0009]

According to the present invention having such means, since the pattern formed on the circuit board can generally be formed quite accurately, the insertion hole can be formed at the center of the above-mentioned positioning pattern while recognizing the positioning pattern. When this is formed, this insertion hole is also accurately positioned, and when the positioning pin on the stator side is inserted through this insertion hole, the circuit board is supported at the correct position on the stator side.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. Note that the same reference numerals are given to portions common to the conventional example.

FIG. 1 shows an insulating circuit board 1. A frequency power generation pattern 21 is formed by sequentially connecting a series of short induction patterns along boundaries between N poles and S poles of a main magnet 19, which will be described later. This frequency power generation pattern 21
And two circular indicator patterns 25 for positioning.

The frequency power generation pattern 21 and the indicator pattern 25 are formed at a time by a known method such as printing or etching. The indicator pattern 25 is formed at an arbitrary interval or angle at a position that is not removed by the through hole 23 described later.

Then, as shown in FIG. 2, an insertion hole 27 is punched and formed at the center of the two circular indicator patterns 25 while recognizing the shapes of the two circular indicator patterns 25. A through-hole 23 is also punched and formed at the center of 9. In this drilling step, punching for determining the outer shape of the circuit board 9 may be performed together.

As shown in FIG. 3, such a circuit board 9 has a pair of ball bearings 5a and 5b coaxially fixed to the hollow portion 3 so as to protrude from an outer peripheral step of a fixed cylinder 1 as a stator. The positioning pin 29 is inserted into the insertion hole 27
The through hole 23 is fixed to the outer periphery of the fixed cylinder 1 by inserting the through hole 23 into the fixed cylinder 1.

A magnetic core 11 is fixed to the fixed cylinder 1, a drive coil 13 is wound around the fixed core 1, and a cup-shaped rotor yoke 17 as a rotor is fixed to a rotor shaft 7 protruding from the fixed cylinder 1 via a bush 15. The configuration in which an annular main magnet 19 is mounted inside the rotor yoke 17 so as to face the tip of the magnetic core 11 is the same as that in FIG.

The main magnet 19 has N and S poles alternately magnetized in the circumferential direction.
Cylinder with a built-in rotary head.

Generally, since the pattern formed on the circuit board can be formed quite accurately, the positioning pattern 25 formed on the circuit board 9 also becomes accurate, and an insertion hole 27 as a reference hole is formed at the center of the positioning pattern 25. Is formed, the insertion hole 27 is also accurately positioned. Therefore, when the positioning pin 29 of the fixed cylinder 1 is inserted into the insertion hole 27, the circuit board 9 is accurately positioned on the fixed cylinder 1.

Therefore, it is easy to improve the accuracy of the concentric positional relationship between the frequency power generation pattern 21 and the main magnet 19, and it is possible to suppress the characteristics of the brushless motor, particularly, wow and flutter.

In addition, even if the frequency power generation pattern 21 and the indicator pattern 25 are displaced during the formation thereof, they are always displaced in the same direction. The positional accuracy is not easily reduced.

The present invention is applicable not only to the circuit board 9 on which the frequency power generation pattern 21 is formed but also to a circuit board of a motor having various sensor patterns, and can be applied not only to a brushless motor but also to various motors.

[0021]

As described above, according to the present invention, a positioning pattern is formed on a circuit board, an insertion hole is formed at a predetermined position of the positioning pattern, and then a positioning pin standing on the stator side is inserted into the insertion hole. Since the motor is manufactured by supporting the circuit board on the souter side by inserting it, the circuit board can be accurately and easily arranged at a predetermined position on the stator side,
High motor characteristics can be maintained.

[Brief description of the drawings]

FIG. 1 is a diagram showing steps of a method for manufacturing a motor according to the present invention.

FIG. 2 is a diagram showing steps of a method for manufacturing a motor according to the present invention.

FIG. 3 is a longitudinal sectional view showing an example of a motor manufactured according to the present invention.

FIG. 4 is a longitudinal sectional view showing an example of a conventional motor.

FIG. 5 is a diagram showing a circuit board used for the motor of FIG. 4;

[Explanation of symbols]

 Reference Signs List 1 stator (fixed cylinder) 3 hollow portion 5a, 5b ball bearing 7 rotor (rotor shaft) 9 circuit board 11 stator (magnetic core) 13 drive coil 15 bush 17 rotor (rotor yoke) 19 rotor (main magnet) 21 sensor pattern (frequency) Power generation pattern) 23 Through hole 25 Positioning pattern (indicator pattern) 27 Insertion hole 29 Positioning pin 31 Rotary cylinder

Continuation of the front page (72) Inventor Toru Inaba 2-122, Manpeira-cho, Kumagaya-shi, Saitama Prefecture Inside Kumagaya Seimitsu Co., Ltd. (56) References JP-A 1-159573 (JP, U) JP 1-1127370 (JP, U) JP, U)

Claims (1)

(57) [Claims] 1. A circuit board having a sensor pattern and a positioning pattern for rotatably supporting a rotor having a magnet on a stator side and inducing an electric signal by displacement of the magnet with rotation of the rotor. In a method for manufacturing a motor which is supported on the stator side facing the rotor, a sensor pattern and a positioning pattern are provided on the circuit board.
Simultaneously forming a pattern forming step, a hole forming step of forming an insertion hole at a predetermined position of the positioning pattern, and positioning the circuit board so that a positioning pin erected on the stator side is inserted into the insertion hole. A method for manufacturing a motor, comprising: a supporting step of supporting the motor on a stator side.