JPH0340072Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brushless motor with a core, and particularly to a holding structure for a circuit board used in connection with a brushless motor.

Brushless motors typically include a circuit board that controls energization of their drive coils. Furthermore, the stator of a brushless motor may be coreless, but it may also have a core. However, in conventional brushless motors with cores,
The stator with the core and the necessary circuit board are fixed separately with screws, so that the fixing means are separate, which increases the number of assembly steps and makes disassembly difficult.

The purpose of the present invention is to provide a circuit board holding structure for a brushless motor that requires fewer assembly steps and is easy to disassemble by having a structure in which the circuit board is fixed at the same time as the stator with the core is fixed. be.

The feature of the present invention is that the laminated cores are fixed together by a headed fixing member that penetrates through the laminated core, and this serves as a stator. The reason is that the circuit board is held between the bearing holder and the bearing holder.

The present invention will be explained below with reference to illustrated embodiments.

In FIG. 1, a carburetor shaft 1, which is the rotating shaft of the motor, is rotatably supported by bearings 3, 3 fitted inside the upper and lower ends of a bearing holder 2, and protrudes from the bearing holder 2. A dish-shaped rotor case 5 is fixed to the lower end of the capstan shaft 1 via a boss 4. A rotor magnet 6 is fixed to the inner peripheral surface of the rotor case 5. A flange 7 is formed on the outer periphery of the bearing holder 2 near the lower end.
, screw holes 8 extending in the axial direction are provided at multiple locations in the circumferential direction. Mounting screws 10 passing through the stator 9 are screwed into each of the screw holes 8 . The stator 9 is formed by laminating a plurality of core plates, and a rivet 11 as a headed fixing member penetrates through the laminated core.
By caulking, the stator cores are fixed together to form the stator 9. Rivets 11
are used at multiple locations in the circumferential direction. When attaching the stator 9 to the bearing holder 2 using the mounting screws 10, fit the center hole of the stator 9 onto the outer periphery of the lower end of the bearing holder 2 with the head 12 of the rivet 11 facing upward. In this state, the screw 10 is screwed into the screw hole 8 of the bearing holder 2. In addition, the center hole of the circuit board 13 is inserted into the bearing holder 2 from the lower end side in advance, and with the edge of the center hole of the circuit board 13 in contact with the lower surface of the flange 7 of the bearing holder 2, the screw 10 is inserted as described above. into the screw hole 8. By doing so, the circuit board 13 is clamped and fixed between the heads 12 of the plurality of rivets 11 passing through the stator 9 and the lower surface of the flange 7 of the bearing holder 2. The outer periphery of the stator 9 is formed into a cylindrical shape, and faces the inner periphery of the rotor magnet 6 with an appropriate gap therebetween.
A drive coil having an appropriate number of poles (not shown) is wound around the stator 9, and the drive circuit configured on the circuit board 13 controls the supply of electricity to the drive coil, thereby connecting the rotor magnet 6 and the rotor magnet 6 substantially integrally therewith. A capstan shaft 1 is rotationally driven. Flange portion 7 of bearing holder 2
The screw hole 8 is also provided with a screw hole different from the screw hole 8, and by screwing the fixing screw 15 inserted into the chassis 14 of the device to which the motor is to be installed into the screw hole, the motor can be attached to the chassis of the device. 14
It is now possible to install it on etc.

According to the embodiment of the present invention described above, at the same time as the stator 9 is attached to the bearing holder 2, the rivet 1 passing through the bearing holder 2 and the stator 9 is attached.
Since the circuit board 13 is clamped and fixed between the head 12 of the head 1 and the circuit board 12, the assembly process is shorter than the conventional structure in which the stator mounting and the circuit board mounting are performed separately. It has the advantage of being small and easy to disassemble if necessary.

Note that the electric circuit formed on the circuit board 13 is
The circuit is not limited to a circuit for controlling current supply to the drive coil, and may be a general electric circuit. Also,
Bolts and nuts may be used instead of the rivets 11.

The motor according to the above embodiment is for use in a tape recorder, and in FIG. It is meant to be imposed. However, it goes without saying that the motor of the present invention is not limited to use in tape recorders.

In the embodiment shown in FIG. 2, the rivet 21 that penetrates through the bearing core and fixes them together is a hollow rivet, and the mounting screw 20 passed through the hollow rivet 21 is attached to the flange portion 7 of the bearing holder 2. By screwing into screw holes 8 formed in The circuit board 13 is sandwiched and fixed between the two.
According to this embodiment, there is an advantage that the number of holes provided in the stator 9 can be reduced.

As described above, according to the present invention, when the stator is attached to the bearing holder, the circuit board is held between the bearing holder and the head of the headed fixing member that penetrates the stratified core that constitutes the stator, In addition, since the stator and circuit board are fixed, compared to a case where the stator and circuit board are attached separately, assembly processes such as caulking, gluing, and screwing can be reduced. It is also easy to disassemble. Furthermore, the stator and circuit board can be freely disassembled by simply loosening the screws, so even if one malfunctions, the other can be freely replaced.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of the present invention, and FIG. 2 is a longitudinal cross-sectional view showing essential parts of another embodiment of the present invention. 1... Capstan shaft (rotating shaft of the motor), 2
... Bearing holder, 5 ... Rotor case, 6 ...
Rotor magnet, 8... Screw hole, 9... Stator, 10... Mounting screw, 11... Rivet (headed fixing member), 12... Head, 13... Circuit board,
20... Mounting screw, 21... Hollow rivet (headed fixing member), 22... Head.

Claims (1)

[Scope of Claim for Utility Model Registration] A circuit board holding structure for a brushless motor comprising a bearing holder, a stator, a circuit board for controlling energization, etc., a mounting screw, and a headed fixing member, which comprises: The bearing holder has a flange on the outer periphery, the stator is formed by fixing the laminated core together with the headed fixing member passing through the laminated core, and the circuit board is connected to one surface of the flange and the stator. The circuit board is disposed between the head of the headed fixing member and one surface of the flange by screwing the mounting screw passing through the stator into the screw hole formed in the flange. A circuit board holding structure for a brushless motor, characterized in that the circuit board is clamped and fixed.