JP3119885B2 - Brushless motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brushless motor mainly used in the OA field, particularly for a memory device required to be miniaturized.

[0002]

2. Description of the Related Art In recent years, the capacity and size of a memory device, which is a peripheral device of a computer, has been rapidly progressing. At the same time, high performance and ultra-small spindle motors for rotating media are also required.

Hereinafter, a conventional brushless motor will be described with reference to the drawings. FIG. 4 shows the structure of a conventional brushless motor. FIG. 5 is a side view of the stator coil unit of FIG.

In FIGS. 4 and 5, reference numeral 19 denotes a shaft. A spindle hub 20 is press-fitted and fixed to the shaft 19. A rotor frame 21 to which a rotor magnet 22 is adhered is caulked and fixed to the spindle hub 20. 32 is a chucking magnet. The rotating part and the fixed part have two bearings 30a, 30b.
Connected through. 31 is a bearing 30a, 3
This is a preload spring that applies a preload to 0b. A bracket 33 is a motor chassis. The stator substrate 28 and the stator coil portion 23 are fixed to the bracket 33. The stator coil portion 23 includes a stator core 25, an insulator 26 for insulation, and a stator winding 27 which is a copper wire. 24 is a terminal of the stator winding 27. Reference numeral 29 denotes a connection land provided on the stator substrate 28. The terminal of the stator winding 27 is the stator substrate 2
8 and a connection land 29. 24a, 24c
Is a winding terminal, and 27a, 27c, 27d, and 27f are stator windings.

[0005]

However, in the above configuration, in order to connect the winding terminal of the stator coil portion to the stator substrate, the winding terminal is pinched with tweezers or the like, guided to the coupling land, and then manually soldered. I had to do. Generally, in a three-phase full-wave brushless motor, there are three winding terminals, and the three-phase common connection must be similarly performed manually.

In particular, the stator coil portion of a miniaturized motor has a small coil wire diameter and a very small space between the stator coil portion and the connection land, so that it is necessary to use a magnifying glass or the like to work. there were. For this reason, in the conventional configuration, it is difficult to automate the terminal processing operation, and there is a problem that the failure rate such as forgetting to solder is high.

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a brushless motor having a pin hole and a connection pin in a stator coil portion, enabling a winding terminal to be easily connected to a connection land of a stator substrate, and automating a terminal processing operation. The purpose is to:

[0008]

In order to solve the above-mentioned problems, a brushless motor according to the present invention comprises a multi-pole magnetized rotor.
Magnet, stator core, stator insulator and stay
A stator coil portion comprising a stator winding and
One end is inserted into the pin hole provided for each edge, and the other end is
The ends of the stator winding are wound and connected
Mount the connection pins and the motor drive circuit, and
And a stator substrate having coupling lands for connecting
Wherein the stator insulator is:
The stator core and the stator winding are insulated from each other.
And the stator core and the stator winding
The stator in the rotation axis direction of the stator insulator sandwiched between
The side closer to the data board is thicker than the other
The pin hole is provided toward the direction,
The part protruding from the pin hole is bent in the direction of the rotation axis.
The part that is further bent in the direction of the rotation axis is
Bent along the connection land of the stator board
Along the connection lands of the stator pins of the connection pins.
End of the stator winding at the bent portion
Is wound and connected, and the stator winding of the connection pin is performed.
The end where the wire ends are wound and connected is the stay
Connected to the connection lands of the data board.

[0009]

According to the present invention, the terminal of the stator winding can be fixed by winding the terminal of the stator winding around the connection pin, and it is not necessary to guide the terminal to the coupling land by tweezers. The terminals of the windings can be easily positioned just above the connection lands on the stator substrate, and the three-phase common connection can be easily processed by similarly winding the connection pins. Since these connection pins are simply inserted into the stator insulation without processing the stator core, there is no difference in motor characteristics as compared with a motor having a conventional structure.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a structural view of a brushless motor according to one embodiment of the present invention. FIG. 2 is a side view of the stator coil portion of the brushless motor of the present invention, and FIG. 3 is a bottom view thereof. 1 to 3, reference numeral 1 denotes a shaft. A spindle hub 2 is press-fitted and fixed to the shaft 1. The rotor frame 3 to which the rotor magnet 4 is bonded is caulked and fixed to the spindle hub 2. 16 is a chucking magnet. The rotating part and the fixed part are connected via two bearings 14a, 14b.
Reference numeral 15 denotes a preload spring for applying a preload to the bearings 14a and 14b. A bracket 17 is a motor chassis. The stator board 12 and the stator coil unit 5 are fixed to the bracket 17. The stator coil portion 5 is integrally formed with a resin-molded stator insulator 10 that insulates the stator core 9 and the stator winding 11. The stator insulator 10 has a pin hole 8 into which the connection pin 6 is inserted. ing. Reference numeral 11 denotes a copper wire stator winding. Reference numeral 7 denotes a terminal of the stator winding 11. Reference numeral 13 denotes a connection land provided on the stator substrate 12. A motor drive circuit (not shown) for driving this motor is mounted on the stator substrate 12. The stator winding terminal 7 is wound around the connection pin 6 and connected to the connection land 13 of the stator substrate 12. 7a, 7b and 7c are terminals of the three-phase winding, and 7d, 7e and 7f are three-phase common connections. 6a, 6b, 6c are winding terminals 7a, 7b,
Reference numeral 7c denotes a wound connection pin, and reference numeral 6d denotes a connection pin around which three-phase common connections 7d, 7e, and 7f are wound. 11a, 11b, 11c, 11d. 11e. 11f
Is a stator winding. Reference numeral 18 denotes a positioning mark for fixing the stator coil portion 5 to the bracket 17 in FIG.

In the brushless motor constructed as follows, the stator coil portion 5 is inserted into the bracket 17 with the positioning mark 18 shown in FIG.
b, 7c, and three-phase common connections 7d, 7e, and 7f are welded by a point soldering machine or the like to the stator substrate 12 on which the connection lands 13 are respectively disposed immediately below the connection pins 6a, 6b, 6c, and 6d. It can be easily assembled by automatic work.

[0012]

As is clear from the above description, the present invention
Since the stator coil portion can be easily connected to the drive circuit, and no manual process is required, the number of man-hours can be reduced by automatic assembly, and the failure rate can be reduced by automation. Further, since the connection pin are provided Some of the stator insulation, no effect on the processing required without motor characteristics of the stator core, lever provided binding lands electronic component mounting surface, the corner at one side of the stator substrate, cost An advantageous brushless motor can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a brushless motor according to an embodiment of the present invention.

FIG. 2 is a half sectional front view of a stator coil portion of the brushless motor.

FIG. 3 is a bottom view of the stator coil unit.

FIG. 4 is a sectional view of a main part of a conventional brushless motor.

FIG. 5 is a half sectional front view of a stator coil portion of the brushless motor.

[Explanation of symbols]

 Reference Signs List 4 rotor magnet 5 stator coil 6 connection pin 7 end of stator winding 8 pin hole 10 stator insulator 12 stator board 13 connection land

Continuation of the front page (56) References JP-A-2-285943 (JP, A) JP-A-63-66084 (JP, U) JP-A-59-191879 (JP, U) JP-A-56-136468 (JP) , U) Japanese Utility Model 58-193843 (JP, U)

Claims (1)

(57) [Claims] 1. A multi-pole magnetized rotor magnet, a stator coil portion including a stator core, a stator insulator, and a stator winding, and one end inserted into a pin hole provided for each stator insulator. A brushless motor comprising: a connection pin having an end wound around and connected to a terminal of the stator winding; and a stator board having a motor driving circuit mounted thereon and having a connection land connecting the connection pin. the stator insulating material, is provided with and said stator winding and the stator core to isolate the previous
The stator sandwiched between the stator core and the stator winding.
The side of the data insulator close to the stator substrate in the rotation axis direction
Is thicker than the other side, and
A pin hole is provided , a portion of the connection pin protruding from the pin hole is bent in the rotation axis direction, and a portion bent further in the rotation axis direction is formed along the coupling land of the stator substrate. The end of the stator winding is wound and connected to a portion of the connection pin bent along the connection land of the stator substrate, and the end of the stator winding of the connection pin is wound. A brushless motor, wherein the connected portion is connected to a connection land of the stator substrate.