JPH0614774B2 - Brushless motor stator - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator of a brushless electric motor used as a blower fan drive source for a home air conditioner or the like.

2. Description of the Related Art In recent years, in air conditioners such as home air conditioners, it is becoming mainstream to control the capacity of a compressor. In response to this, it is also required to adjust the amount of air blown to the heat exchanger in a wide range and in multiple stages. Instead of the induction motor as a fan drive source that has been used conventionally to satisfy these demands, A method of operating a brushless motor whose speed is easily adjusted with a DC power source is being adopted. On the other hand, there is a strong demand for light, thin, short and compact motors of this kind.

As a method of driving the brushless electric motor, two methods have been conventionally considered and adopted.

The first method is a method of adopting the configuration shown in the block diagram of FIG. 6 in which the motor section A and the drive circuit section B are formed separately, and each section is connected by a lead wire group C.

In the second method, as shown in the block diagram of FIG. 7, the motor unit A and the drive circuit unit B are integrally formed in the motor unit, and the drive circuit unit B is embedded in the resin. . Second
Examples of the method described in JP-A-55-104594 can be cited.

An example of the second method will be described below with reference to the drawings.

FIG. 8 is a vertical sectional view of a conventional brushless electric motor. Iron core 1
The winding 2 is wound around the yoke portion of the above, and the outer cover is formed by the resin mold 3. The shaft 6 is supported by the bearings 4 and 5, and the permanent magnet rotor 7 is configured. On the other hand, the control circuit 8 and the integrated circuit 9 forming the control circuit are fixed to the surface of the doughnut-shaped printed circuit board 10 on the side opposite to the iron core, and are embedded in the winding ends of the resin mold 3. The position sensor 12 is fixed to the surface of the printed board 10 on the iron core side. Power is supplied to the control circuit 8 by the lead wire 13, and the lead wire 13 is supported by the resin mold 3 by the protective material 14. Cooling fins 11 are formed on a part of the resin mold 3. Further, FIG. 9 shows a perspective view of a completed stator winding using a conventional printed circuit board shape. Completion of the winding in which the winding 3 is wound around the teeth of the iron core 1 with the iron core insulation 2 and the printed circuit board 4 on which the components for the drive circuit and the position sensor are mounted to complete the stator winding. ing.

Problems to be Solved by the Invention With the above configuration, the following problems can be considered.

(1) It is difficult to position the outlet bush and the printed circuit board in a correlative manner, and the workability of mounting the stator on the resin molding die is poor.

(2) Since the printed circuit board is doughnut-shaped, the output bush for protecting the lead wire group from heat and pressure is located on the outer diameter of the printed circuit board when molding the resin of the stator. Grows larger.

Means for Solving Problems The present invention takes the following means in order to solve the problems of the conventional example. That is, the printed circuit board is provided with a cutout portion having a size substantially equal to that of the output line protection output bush, and the output bush is fitted into the cutout portion.

Operation With the above configuration, the printed circuit board and the output bush can be easily positioned, the mold device can be easily used during resin molding of the rotor, and even if the printed circuit board has almost the same dimensions as the stator core, the stator The projecting portion of the outer diameter outlet can be less than half the dimension of the outlet bush.

Examples Hereinafter, an example in which the present invention is applied to a three-phase full-wave energization type brushless motor will be described in detail with reference to the drawings. FIG. 1 is an assembly state diagram of a stator winding of a brushless motor according to an embodiment of the present invention.

In FIG. 1, the stator core 1 is formed by laminating iron plates, and the core insulation 2 is formed by integral molding with the core 1 or by inserting a molded product into the core. The winding 3 is wound around the tooth portion 1a of the iron core 1 provided with the iron core insulation 2.
At this time, the shroud portions 2a and 2b of the iron core insulation 2 prevent the winding from collapsing, and at the same time, the inner surface of the shroud portion 2a is provided with a groove 2c for inserting the sensor fixing base 8.
On the other hand, the printed board 4 has a winding end winding protrusion 4a on its outer periphery.
However, the driver IC 5 and the power transistor arrays 6a and 6b are arranged at substantially equal pitches and in a substantially radial pattern.

The position sensor 7 using a hall element is inserted into a sensor fixing base 8 molded to have an electrical angle of 120 ° and mounted on the printed circuit board 4 together with the sensor fixing base 8. or,
Small signal transistor 9, fixed resistor 10, jumper wire 1
When the printed circuit board 4 is mounted on the wound stator core 1, the capacitors 1 and the like are also mounted at positions where they do not contact or interfere with the winding 3 and the shroud portions 2a and 2b.

The printed circuit board 4 is held in a fixed position in the mold at the time of resin molding, and a mold pin for forming a hole for inserting a through bolt or a rivet at the time of assembling the electric motor after molding is inserted. A hole 4b for the purpose is provided.

Further, a lead wire group 13 for supplying power to the printed circuit board 4
A lead bush 14 for protecting the lead wire group 13 from heat and pressure during resin molding is fixed to the lead wire group 13. At this time, in order to prevent interference between the output bush 14 and the printed circuit board 4 and to determine the position of the output bush 14, a positioning groove 4c is provided in the printed circuit board 4 and a hole 4d for positioning with the core insulation is also provided. .

The wound stator core 1 and the printed circuit board 4 on which the components are mounted, which are configured as described above, have a driver I between the shroud portion and the adjacent shroud portion as shown in the side view of the completed winding of FIG.
C5 and power transistor arrays 6a and 6b are located,
The shroud portion is assembled so that the axial tip end thereof is brought into contact with the printed circuit board surface to form the stator winding finished product 15. FIG. 3 is a perspective view of this state, in which the winding end 3a is wound around the winding end winding protrusion 4a of the printed circuit board 4 and conductively fixed with solder or the like. In FIG. 3, the printed wiring on the surface of the printed circuit board, the lead holes for driving and rotating parts, etc. are not shown.

The stator winding having the above-described structure is resin-molded. 4 and 5 show the state of the finished product. In the figure,
16 is a stator, 17 is a bearing device, 18 is a rotor yoke,
Reference numeral 19 is a permanent magnet piece.

EFFECTS OF THE INVENTION With the configuration of the present invention as described above, the following effects can be obtained.

(1) The output bush can be positioned and the workability of mounting the die during resin molding of the stator is increased.

(2) The size of the protruding portion of the lead-out bush of the stator can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of a stator winding assembly state in an embodiment of the present invention, FIG. 2 is a side view of a completed stator winding of FIG. 1, and FIG. 3 is a perspective view of a completed stator winding of FIG. FIG. 4 is a front view of an inversion type brushless electric motor according to the present invention, and FIG. 5 is A- of FIG.
FIG. 6 is a configuration block diagram of the first conventional method, FIG. 7 is a configuration block diagram of the second conventional method, and FIG. 8 is a second conventional method. FIG. 9 is a longitudinal sectional view of a brushless electric motor, and FIG. 9 is a perspective view of a stator winding of a conventional example. 1 ... Stator core, 2 ... Core insulation, 3 ... Winding, 4 ...
... Printed circuit board, 4a ... Winding end winding protrusion, 4c ... Positioning of output bush.

Claims (1)

[Claims] 1. A stator core, a winding wound around the stator core via an insulating layer, a drive circuit component and a position sensor are mounted, and the size of the output bush is substantially equal to that of a lead bush for protecting the output line. A printed circuit board having a cutout portion, and a lead-out push which is inserted into the cutout portion of the printed circuit board and clamps the lead wire, and each of the portions is integrally molded and solidified with a thermosetting resin having electrical insulation. No brushless motor stator.