JP3113933B2 - Power tool with built-in series motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power tool having a built-in series motor having a brush.

[0002]

2. Description of the Related Art As shown in FIG. 10, a stator core 100 of a series motor is provided with a ring-shaped stator core 102.
And a pair of T-shaped teeth 104, 104 protruding from the inner peripheral portion of the stator core 102 so as to face each other. The winding 106 is wound around the stator core 102 by a method such as inner straight winding or winding.

[0005] For example, a nozzle of a winding machine is arranged on the inner peripheral portion of the stator core 102, the winding is sent out from the nozzle, and the nozzle is rotated to perform winding.

[0004]

However, according to the above-described winding method, the winding efficiency is low, and it is difficult to automate the assembly of the stator.

[0005] Therefore, it has been difficult to easily assemble a power tool having a built-in series motor.

Accordingly, the present invention provides an electric tool having a built-in series motor that can easily perform winding on a stator core of the series motor.

[0007]

A series motor according to the present invention.
The power tool with built-in
Two formed in divided state, formed while halving the stator core Shirisu motor axisymmetrically, the two divided windings on each stator core turning each winding, the frame inner
Stator comprising two stator cores wound with the windings
So that the frame is divided into two and the winding
It is one in which two stator cores each having a wire wound thereon are integrated .

[0008]

[Operation] A case of assembling a power tool incorporating the above-described series motor will be described.

First, the stator core is formed in a state where it is divided into two parts with respect to the axis. A winding is wound around each of the two divided stator cores. In this case, since the stator core is divided into two, two windings can be simultaneously performed at a high speed, and the terminal processing of the windings can be easily performed.

Next, a stator composed of two stator cores wound with the windings is built in a frame of the electric power tool.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A stator 10 of a series motor according to a first embodiment of the present invention will be described below with reference to FIGS.

The stator core 12 of the present embodiment is divided into two parts at a position shifted by 90 ° from the center of the teeth, and includes two divided cores 14 and 14 (see FIGS. 1 and 2). In other words, the split iron core 14 has a semi-circular stator core member 16.
And teeth 18 protruding from the central portion of the inner peripheral portion of the stator core member 16. The split core 14 is formed by stacking iron plates of the same shape.

A case where the stator 10 is assembled using the above-mentioned two divided iron cores 14 will be described.

A coil 20 is wound around the semi-cylindrical divided iron core 14. When winding the coil 20, as shown in FIG. 3, the coil 20 is wound on both sides of the base of the tooth 18 by the winding device 22. This winding device 22
Draws out the conductor, which is the coil 20, from the bobbin 26 of the conductor, and the teeth 18 from the tip of the rotating fryer 24.
The coil 20 is wound around the base. And the coil 20
Is formed by the former 28 so that the coil 2 is not wound around one portion of the teeth 18 in a concentrated manner.
The position of 0 is shifted.

When the coil 20 is wound by the winding device 22, the stator core 12 is divided into two divided cores 14, 14.
, It can be wound directly by the flyer 24 and can be wound simultaneously at high speed. In addition, the terminal processing of the coil 20 can be easily performed, and the efficiency of the winding operation can be improved.

A case where the split iron core 14 wound with the coil 20 is attached to the grinder 30 and used as described above will be described with reference to FIGS. The main body of the grinder 30 is composed of a pair of left and right frames 3.
2 and 34, and a series motor is built therein.

The split iron cores 14, 14 are mounted on the frames 32, 34, respectively.

A brush 36 is provided near the split iron cores 14, 14.
Install.

A power cord 39, a connection box 38, and a gear 42 for rotating the blade 40 are attached.

Frame 3 to which split iron core 14 is attached
4. Attach an amateur that is a rotor.

The pair of frames 32 and 34 are integrated.

In the grinder 30 having the above configuration, the stator 10 is divided into two parts, so that the assembling can be easily automated.

A stator 10 according to a second embodiment will be described with reference to FIGS.

The stator core 12 of the second embodiment is formed by dividing the core into two at the center of the teeth 18 to form the divided cores 14 and 14 (see FIGS. 4 and 5). That is, 1
The two split cores 14 are provided with a semi-circular stator core member 16.
And the teeth members 19 which are divided from the both ends of the stator core member 6.

A case where the stator 10 having the above configuration is assembled will be described.

A coil 20 is wound from the center of the semi-cylindrical split core 14 by a winding device 22 (see FIG. 6). In this case, in order to prevent the coil 20 from being concentrated in one place, the divided cores 14 are swung as indicated by arrows in FIG.

Even with this stator 10, the fryer 2
4, the coil 20 can be wound directly, so that the efficiency of the winding operation is improved.

[0028]

As described above, according to the electric power tool incorporating the series motor of the present invention, the stator core is formed in an axially symmetrical state divided into two parts, and the winding operation can be easily performed. , Work efficiency is improved.

The power tool frame is also divided into two parts.
Since it is formed in a state, a power tool incorporating the stator can be easily assembled.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state in which a stator core according to a first embodiment of the present invention is divided.

FIG. 2 is a perspective view of the same.

FIG. 3 is an explanatory diagram of a state in which a coil is wound around a stator core.

FIG. 4 is a plan view showing a state where a stator core of a second embodiment is divided.

FIG. 5 is a perspective view of the same.

FIG. 6 is an explanatory diagram of a state in which a coil is wound around a stator core.

FIG. 7 is an exploded bottom view of the grinder.

FIG. 8 is a longitudinal sectional view of a grinder.

FIG. 9 is a cross-sectional view of a grounder.

FIG. 10 is a plan view of a stator of a conventional series motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Stator 12 Stator iron core 14 Split iron core 16 Stator core member 18 Teeth 20 Coil

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-123933 (JP, A) JP-A-1-138937 (JP, A) JP-A-62-24983 (JP, A) 106866 (JP, U) Japanese Utility Model Showa 58-15468 (JP, U) Japanese Utility Model Showa 60-71579 (JP, U) Japanese Utility Model Utility Model 1-162749 (JP, U) International Publication 92 / 1,020 (WO, A1) ( 58) Fields surveyed (Int.Cl. ⁷ , DB name) H02K 1/00

Claims (1)

(57) [Claims] 1. The frame of an electric power tool is divided into two parts symmetrically with respect to an axis.
The stator core of the series motor was formed in a state in which the stator core of the series motor was bisected axially symmetrically, windings were wound around the respective stator cores thus divided, and the windings were wound inside the frame. Two stator iron
In order to incorporate a stator consisting of a heart, it was divided into two
The frame and the two stator cores around which the windings are wound
A power tool with a built-in series motor, characterized by a body .