JPH04197066A - brushless electric motor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a brushless motor used as a drive source for a blower fan of a household air conditioner or the like.

Conventional technology In recent years, DC brushless motors have been adopted as the blower drive source for indoor single-phase heat exchangers in air conditioning equipment such as home air conditioners, but an inexpensive method of controlling single-phase induction motors with thyristors has also been adopted. Therefore, there is a strong demand for high efficiency, good controllability, and cost reduction for DC brushless motors.

A conventional brushless electric motor had a structure as disclosed in Japanese Patent Application No. 60-90053. Hereinafter, a conventional brushless electric motor will be explained based on the drawings.

FIG. 3 is a longitudinal sectional view of a conventional brushless electric motor.

A winding 3 is wound around the yoke part of the iron core 1 via an insulating layer 2,
A printed circuit board 4 is attached in contact with the insulating layer 2, and a fixing part 5 is formed of thermosetting resin.

On the other hand, the rotating part is composed of a permanent magnet rotor 8 attached to the shaft 6, a sensor permanent magnet 9 attached to the end face of the permanent magnet, an oil recovery slinger 12, and a thrust boss 13.
The bearing device 10 is inserted into a bearing housing 5a formed on the inner diameter of the stator 5, and the other bearing device 11 is fixed by a rehet 14 to constitute a brushless electric motor.

Problems to be Solved by the Invention However, with the above configuration, the following problems may occur.

1. Since the printed circuit board, the winding wire, and the stator core are integrally molded from thermosetting resin, the scope of use is narrowly limited depending on the standard range of the parts mounted on the printed circuit board and the winding specifications.

2. The rotating part is fixed to the electric motor stator using a steel plate bracket, which is a bearing housing, and the other bearing device, which requires a lot of man-hours and is difficult to work with.

3. Since the drive circuit components mounted on the printed circuit board are arranged in the space between the windings, the degree of freedom in arranging the components is greatly reduced.

Means for Solving the Problems In order to solve the above-mentioned conventional problems, the present invention implements the following configuration.

The annular stator core and the winding through the insulating layer formed on the stator core are integrally molded with thermosetting resin, and at the same time, the housing for the bearing at least one location above the end face of the stator core is thermoset. The armature stator is molded using synthetic resin. Furthermore, a bearing housing for at least one force point is integrally molded with thermosetting resin on one side of the printed circuit board on which the position sensor and drive circuit components are mounted.

A rotor having a permanent magnet is inserted into the armature stator, and the drive circuit resin molded product and the armature stator are fixed in contact with each other to form a brushless motor.

Effect: With the above structure, it is easy to change the arrangement of the drive circuit resin molded product, the annular stator core, and the motor stator portion in which the windings are molded from thermosetting resin. Furthermore, since a bearing housing is formed of thermosetting resin on the stator inner end face and on one side of the inner diameter of the printed circuit board, a steel plate bracket is not required, and the work of attaching the rotor to the stator becomes easier.

EXAMPLE Hereinafter, an example of a brushless electric motor according to the present invention will be described in detail with reference to the drawings.

In FIG. 1, a winding 3 is wound around a stator core 1 via a core insulating layer 2, and a terminal 2b attached to a shroud portion 2a of the core insulating layer 2 is wound at the end of the winding. On the other hand, the printed circuit board 4 has a connector 4a that serves as a connecting portion for the terminal 2b, and has electronic components constituting a drive circuit mounted thereon.

FIG. 2 is a vertical half-sectional view of the brushless electric motor of the present invention.

The stator 5 is made of an insulating thermosetting resin together with the stator core 1 and the winding 3. A bearing housing portion 5a is formed on the inner diameter side of the stator 5, and a bearing 7 press-fitted onto the shaft 6 is inserted into the bearing housing 5a. A permanent magnet rotor 8 is fixed to the shaft 6, and a sensor water magnet 9 is attached to an end face of the permanent magnet rotor.

Also, a printed circuit board 4 on which electronic components for a drive circuit are mounted.
Similarly to the stator core 1 and the winding 3, the bearing housing 5b is also molded from thermosetting resin, and a bearing housing portion 5b is formed on the inner diameter side of one side of the printed circuit board. The other bearing is inserted into a bearing housing 5b made of thermosetting resin at the inner diameter of the printed circuit board, thereby constructing a brushless electric motor.

By configuring the present invention as described in detail, the following effects can be obtained.

1. By molding the drive circuit board, stator core, and windings separately from thermosetting resin, the combination can be easily changed, allowing for further standardization of the product.

2. The arrangement area of the drive circuit components mounted on the printed circuit board is expanded, and it is possible to easily cope with the increase in the number of components due to the increased functionality and performance of brushless motors.

3. When an abnormality occurs in the parts mounted on the printed circuit board or the windings wrapped around the stator core during the manufacturing process, it is possible to use the product by replacing either one, reducing the number of defective wastes. .

4. Material costs and man-hours can be reduced by molding the motor stator and printed circuit board with thermosetting resin and providing a bearing housing.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the assembled stator windings of a brushless motor according to the present invention, FIG. 2 is a vertical half-sectional view of the same brushless motor, and FIG. 3 is a vertical half-sectional view of a conventional brushless motor. It is a diagram. DESCRIPTION OF SYMBOLS 1... Stator core, 2... Core insulation layer, 2a... Shroud part, 2b... Winding end winding terminal, 3... ...Winding, 4...Printed circuit board, 4a...Winding end winding terminal connector, 5...Stator, 5a, 5b...・Bearing housing, 6...shaft, 7...bearing, 8...permanent magnet rotor, 9...sensor magnet, 10°11... ...Bearing device, 14...
...Lihet. Name of agent: Patent attorney Haruaki Ogata and 2 others $I
E 4
2a---Shroud part 1- Koshin Jten 1"Q+
' Figure 2 2-*,
s4 base line layer 2b --- winding thread (length lrL size female bell ± 3- winding string 4 --- assont base 4a --- 4 elements 1 or break 1 + 4 --- 1)

Claims (1)

[Claims] A motor fixing consisting of an annular stator core, windings formed on the stator core through an insulating layer, and at least one bearing housing on the end face side of the stator core integrally molded with thermosetting resin. a bearing housing formed on the motor stator, at least one bearing housing being integrally formed with the thermosetting resin on one side of a printed wiring board on which the position sensor and drive circuit components are mounted; A brushless electric motor that is fixed in contact with and facing each other.