JPH07298532A - Assembly method for axial brushless motor - Google Patents

Abstract

PURPOSE:To enhance assembly works by bonding a coil to a board through reflow using a thermosetting adhesive while simultaneously connecting the coil with a position detecting element electrically by soldering. CONSTITUTION:The rotor comprises a rotor yoke secured to a shaft, and a multipolar rotor magnet fixed thereto. The stator comprises a housing secured to the chassis 7, bearings held by the housing, and a coil 8 bonded through a thermosetting resin 14 to a board 4. Coil terminals and a position detecting element 10 are connected electrically with the board through a solder 11. The thermosetting resin 14 is applied to the board or the coil 8 which is then positioned and bonded through reflow thus performing the process for connecting the coil terminals and the position detecting element 10 through the solder 11 simultaneously.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axial type brushless motor (hereinafter referred to as a motor) having a coil bonded and fixed.
The present invention relates to a method of assembling the.

[0002]

2. Description of the Related Art In recent years, with the trend toward miniaturization and thinning of sets of VTRs and cassette tape recorders, motors used in these devices are also required to be compact and thin.
For this reason, each component of the motor is required to be smaller and thinner, but if the conventional method is used as it is, the assembly man-hours and assembly efficiency will be reduced due to the smaller and thinner coil adhesive fixing, resulting in cost reduction. Had a problem with.

A conventional motor configuration will be described below. FIG. 5 is a structural diagram of a conventional motor.
6 and 7 are plan views of a conventional motor used in FIG.

As shown in FIG. 5, 1 is a shaft and 2 is a rotor yoke fixed to the shaft 1. Reference numeral 3 denotes a rotor magnet, which is magnetized in multiple poles and attached to the rotor yoke 2 to form a rotor. Reference numeral 4 is a substrate, 5 is a bearing, and 6 is a housing having a cylindrical portion that holds the bearing 5 and extends in the axial direction. 7 is a stator chassis to which the substrate 4 and the housing 6 are fixed. Reference numeral 8 is a coil, 9 is a coil terminal of the coil 8, and 10 is a position detecting element which is arranged inside the coil 8 and detects the magnetic field of the rotor magnet 3. The coil 8 is attached to the substrate 4 at a position facing the rotor magnet 3. Reference numeral 11 denotes solder, which electrically connects the coil terminal 9 of the coil 8 attached to the substrate 4 to the substrate 4. The substrate 4, the bearing 5, the housing 6, the stator chassis 7, and the coil 8 form a stator.

As shown in FIG. 6, an adhesive 12 is applied to the substrate 4 or the coil 8, the coil 8 is positioned and fixed on the substrate 4, and then the coil terminal 9 and the position detecting element are soldered. 10 was electrically connected.

Further, as shown in FIG. 7, the double-sided adhesive sheet 13 is used to bond and fix the substrate 4 and the coil 8 to the stator chassis 7, and the coil terminal 9 is electrically connected to the substrate 4 by the solder 11. .

[0007]

However, the method of adhesively fixing the coil 8 is such that the coil 8 is adhesively fixed by using the adhesive 12 and then the coil terminal 9 and the position detecting element 10 are electrically connected by the solder 11. It had the problems of poor man-hours, assembly efficiency, and workability. Moreover, since the double-sided adhesive sheet is used to fix the stator chassis 7, the coil 8 and the substrate 4, the problem arises in terms of adhesive strength and cost.

The present invention solves the above problems, and provides an axial brushless motor capable of reducing the number of assembly steps, the assembly efficiency, and the cost in the coil adhesive fixing which can cope with the downsizing and thinning of the motor by a simple method. The purpose is to do.

[0009]

In order to achieve this object, a method for adhering and fixing a coil according to the present invention is such that a thermosetting adhesive is used to adhere and fix the coil to a substrate by reflow, and the coil and the position are fixed by soldering. The detection elements are electrically connected at the same time. Further, it is a method in which an adhesive is applied to an adhesive application hole of a thin insulating sheet, and is sandwiched between a coil, a substrate and a stator chassis and adhered and fixed.

[0010]

With this structure, the coil, the position detecting element, and the substrate can be bonded and fixed at the same time, so that the assembling workability can be improved and the assembling man-hour and the assembling efficiency can be increased.

Next, an adhesive is used to sandwich the thin insulating sheet between the stator chassis, the substrate and the coil, and the substrate and the coil are adhesively fixed to the stator chassis, whereby the adhesive strength of the coil can be increased and the cost can be reduced.

[0012]

【Example】

(First Embodiment) A first embodiment of the present invention will be described below with reference to the drawings. It should be noted that the same parts as those of the conventional configuration are denoted by the reference numerals in the conventional example, and the description thereof will be omitted.

FIG. 1 shows the structure of a motor according to the first embodiment of the present invention. FIG. 2 shows a plan view of this embodiment. 14 is a thermosetting adhesive. A rotor yoke 2 fixed to the shaft 1, a rotor in which a rotor magnet 3 magnetized in multiple poles is attached to the rotor yoke 2, a housing 6 fixed to a stator chassis 7, and a bearing 5 held in the housing 6. The stator is constituted by the coil 8 which is bonded and fixed to the substrate 4 using the thermosetting adhesive 14. The coil terminal 9 and the position detecting element 10 are electrically connected to the substrate 4 with solder 11. As shown in FIG. 2, the thermosetting adhesive 14
Is applied to the substrate 4 or the coil 8, the coil 8 is positioned and the coil 8 is adhesively fixed by reflow, and the coil terminal 9 and the position detecting element 10 are electrically connected by the solder 11 at the same time.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings. It should be noted that the same parts as those of the conventional configuration are denoted by the reference numerals in the conventional example, and the description thereof will be omitted.

FIG. 3 shows the structure of the motor according to the second embodiment of the present invention. FIG. 4 shows a plan view of this embodiment. Reference numeral 12 is an adhesive, 15 is a thin insulating sheet, and 16 is an adhesive application hole. A rotor yoke 2 fixed to a shaft 1, a rotor in which a rotor magnet magnetized in multiple poles is attached to the rotor yoke, a housing 6 fixed to a stator chassis 7, and a bearing 5 held in the housing 6. The thin insulating sheet 15 is sandwiched between the substrate 4, the coil 8 and the stator chassis 7 to form a stator. The coil terminal 9 is soldered 11 to the substrate 4.
Is electrically connected by. As shown in FIG. 4, an adhesive application hole 16 is provided in the thin insulating sheet 15, the adhesive application hole 16 is arranged on the stator chassis 7, the adhesive 12 is applied to the adhesive application hole, and the stator chassis 7 and the substrate 4 and the coil 8 are adhesively fixed. To do.

Although the board 4 and the stator chassis 7 are functionally classified in the first embodiment, it goes without saying that they may be integrally formed.

[0017]

As described above, the present invention provides a thin and compact motor which can reduce the number of motor assembling steps, the assembling efficiency, and the cost by simultaneously adhering and fixing the coil and connecting the coil terminals by reflow. it can. Further, by using the thin insulating sheet and the adhesive in combination, it is possible to obtain an excellent axial type brushless motor that can reduce the cost and increase the adhesive strength of the coil.

[Brief description of drawings]

FIG. 1 is a structural diagram of a motor according to a first embodiment of the present invention.

FIG. 2 is a plan view of a motor according to the same embodiment of the present invention.

FIG. 3 is a structural diagram of a motor according to a second embodiment of the present invention.

FIG. 4 is an exploded perspective view of a motor according to the embodiment of the present invention.

FIG. 5 is a motor structure diagram of a conventional example.

FIG. 6 is a plan view of a conventional motor

FIG. 7 is an exploded perspective view of a conventional motor

[Explanation of symbols]

 1 axis 2 rotor yoke 3 rotor magnet 4 substrate 5 bearing 6 housing 7 stator chassis 8 coil 9 coil terminal 10 position detection element 11 solder 12 adhesive 13 double-sided adhesive sheet 14 thermosetting adhesive 15 thin insulating sheet 16 adhesive application hole

Claims (2)

[Claims] 1. An axial type comprising a rotor including a rotor yoke fixed to a shaft and a rotor magnet attached to the rotor yoke, a housing holding a bearing, a substrate on which a coil is mounted, and a stator including a stator chassis. In a brushless motor, a thermosetting adhesive is applied to the coil or the substrate, the coil is arranged on the substrate, the coil and the substrate are bonded and fixed by reflow, and the coil terminal and the position detecting element are electrically connected by soldering. A method for assembling an axial brushless motor formed by simultaneously making connections. 2. An axial type comprising a rotor composed of a rotor yoke fixed to a shaft and a rotor magnet attached to the rotor yoke, a housing holding a bearing, a substrate on which a coil is mounted, and a stator composed of a stator chassis. In a brushless motor, a thin insulating sheet provided with an adhesive application hole is arranged on a stator chassis, an adhesive is applied to the adhesive application hole and sandwiched between the coil and the substrate, and the coil and the substrate are attached to the stator. How to assemble an axial brushless motor bonded to a chassis.