JPH0753023B2 - 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. Correspondingly, 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 conventionally used to meet these demands, A method of operating a brushless motor, which is easy to adjust, 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. A first method is a method in which the motor unit A and the drive circuit unit B are separately configured by adopting the configuration shown in the block diagram of FIG. .

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
As an example of the above method, there is JP-A-55-104594. The present invention relates to the second method.

FIG. 8 shows a perspective view of the completion of the conventional stator.

A printed circuit board 4 on which a position sensor and a drive circuit component are mounted in a substantially donut shape is mounted on a completed winding product in which a winding 3 is wound around a tooth portion of an iron core 1 on which an iron core insulation 2 is applied. ing. Winding end treatment is a protrusion provided on the printed circuit board 4.
The winding end 3a is directly wound around the wire 4a and is fixed in a state of being electrically connected with solder or the like.

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

(1) When the winding is wound around the protrusion of the printed circuit board, it cannot be easily performed due to interference with the core insulation.

(2) Due to the above-mentioned reasons, a defective fixing of the conductor such as solder is likely to occur.

Means for Solving the Problems In order to solve the problems of the above-mentioned conventional example, the present invention provides a cutout portion in the vicinity of the winding end winding conductive fixing protrusion of the printed circuit board, and draws the winding wire in the cutout portion. It hangs and guides to the above-mentioned winding-end winding conductive fixing projection.

With the above configuration, the winding process on the printed circuit board can be performed easily and reliably, and the cutout portion improves the resin flow during resin molding of the stator. It is also possible to reduce the stress that the drive circuit components or built-in components such as the position sensor receive.

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 are prevented from collapsing the windings, and at the same time, the inner diameter 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 circuit board 4 is formed in a substantially donut shape even though it has a winding hooking groove 4a and a winding end winding conductive fixing protrusion 4b on the outer periphery thereof, while the driver IC 5 and the power transistor array 6a 3 and 6b are arranged at a substantially equal pitch and in a substantially radial pattern.

The position sensor 7 using a hall element is inserted into a sensor fixing base 8 formed to have an electrical angle of 120 ° and is mounted on the printed board 4 together with the sensor fixing base 8.

Also, small signal transistor 9, fixed resistor 10, jumper wire
When the printed circuit board 4 is mounted on the stator core 1 on which the winding 11 and the capacitor 12 are already wound, the winding 3 and the shroud part
It is mounted at a position where it does not touch or interfere with 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 a motor after molding is inserted. A hole 4c is provided for this purpose.

Further, a lead wire group 13 for power supply is also attached to the printed circuit board 4, and 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, the hole 4d for positioning with the iron core insulation 2
Is also provided.

The stator core 1 with windings and the printed circuit board 4 with components mounted as described above have a driver IC between the shroud part and the adjacent shroud part as shown in the side view of the completed winding in FIG.
5 and the power transistor arrays 6a and 6b are positioned and combined so that the axial ends of the shroud portions 2a and 2b are brought into contact with the printed circuit board surface to form a stator winding completed product 15.

FIG. 3 is a perspective view of this state, in which the winding end 3a is hooked in the winding hooking groove 4a of the printed board 4, and then wound around the winding end winding conductive fixing protrusion 4b to be electrically conductive with solder or the like. Fixed. In FIG. 3, the printed wiring on the surface of the printed board and the lead holes for the drive circuit parts are not shown.

The finished stator winding product configured as described above is resin-molded. Figures 4 and 5 show the finished product. In the figure, 16 is a stator, 17 is a bearing device, 18 is a rotor yoke, and 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) Winding winding The winding can be easily wound around the conductive fixing protrusion.

(2) The winding process can be reliably performed by hooking the winding on the notch.

(3) The resin flow can be improved, and the stress at the time of resin molding of the stator on the printed circuit board, drive circuit parts and position sensor 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.
Sectional view taken along line OB, FIG. 6 is a block diagram of the first method of the conventional example, FIG. 7 is a block diagram of the second method of the conventional example, and FIG. 8 is a stator winding of the conventional example. It is a perspective view. 1 ... Stator core, 2 ... Core insulation, 3 ... Winding, 4 ...
... Printed circuit board, 4a ... Winding hook groove, 4b ... Winding end winding conductive fixing protrusion.

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 a winding winding conductive fixing protrusion and the vicinity of the protrusion are provided. A stator for a brushless electric motor, comprising a printed circuit board having a groove for guiding the winding to the protrusion, and integrally molding and solidifying each of the above parts with a thermosetting resin having an electric insulation property.