JPH038058Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Application of the Invention) The present invention relates to a fixing structure between a stator body and a bracket of a small electric motor.

(Prior Art) The prior art and its problems will be explained with reference to FIGS. 6 to 8.

FIG. 6 is an enlarged sectional view showing an embodiment of a fixed portion of a bracket and a stator of a small electric motor according to the prior art.

In FIG. 6, a stator 3 in which a stator winding 6 is wound around a stator iron core 4 via a winding insulator 5 is held between two brackets 1 and 2, and is secured by a small screw 7. It is fixed integrally.

FIG. 7 is a detailed view of the bracket, in which the bracket 1 shown in a is formed with a screw hole 1-2, and the bracket 2 shown in b is formed with a small hole 2-2 for receiving the head of the small screw 7. There is. Figure 8 shows stator core 4.
6, a U-shaped groove 4-1 is formed in the yoke portion of the stator core 4, and in FIG. 6, the screw 7 passes through the U-shaped groove 4-1 of the stator core. Stator 3
and brackets 1 and 2 are integrally fixed.

In the configuration shown in FIG. 6, a long small screw 7 is required to pass through the stator 3, and the small screw 7 is inserted from the small hole 2-1 formed in one bracket 2 toward the screw hole 1-2 formed in the other bracket 1. When screwing in the screw 7, the screw 7 is unstable and the workability is poor, and there is a U-shaped groove 4 in the yoke part of the stator core 4 shown in FIG.
1, the rigidity of the yoke decreases and there are problems such as unbalance of the magnetic circuit.

(Purpose of the invention) An object of the invention is to obtain a small electric motor that facilitates fixation of a stator and a bracket and that can ensure magnetic balance and rigidity of the stator core.

(Summary of the invention) The small electric motor of the invention has a seat and a small protrusion that come into contact with the bracket integrally formed on the front end surface or one end surface of the winding insulator of the stator, and a seat that contacts the bracket and the small protrusion. Small holes are formed at opposing positions,
The stator and the bracket are characterized in that the stator and the bracket are integrally fixed by fitting the small protrusions formed in the winding insulator into the small holes formed in the bracket.

(Embodiments of the invention) Examples of the invention will be described below with reference to the drawings. FIG. 5 is a cross-sectional view of a small electric motor according to an embodiment of the present invention, and FIG. 1 is an enlarged cross-sectional view of the small electric motor shown in FIG. 5, showing the fixed portion of the stator and bracket.

In FIG. 5, 1 and 2 are brackets, 3 is a stator, 8 is a rotor, and 8-1 is a rotor shaft.

In Fig. 1, the stator core 4 has a winding insulator 5.
is attached and the stator winding 6 is wound thereon.

The winding insulator 5 has seats 5-1 on its front and rear end faces that abut against the brackets 1 and 2, and small protrusions 5-2 that fit into the small holes 1-1 and 1-2 of both brackets. , a seat 5- that abuts the bracket;
It is integrally formed with a diameter smaller than 1.

FIG. 3 is a detailed view of the stator 3 shown in FIG. 1, and is a partial sectional view of the winding insulator 5 attached to the stator core 4 before being assembled with the brackets 1 and 2.

In the embodiment shown in FIG. 3, the small protrusions 5-2 on both the front and rear
1 and 2, respectively, and the length of the small protrusion 5-2 protruding from the seat 5-1 is set to be sufficiently longer than the thickness of each of the brackets, as shown in FIG. As shown, the brackets 1 and 2 are connected to the stator by welding the tip portions 5-3 of the projections of the small protrusions 5-2 that protrude outside from the small holes 1-1 and 1-2 of the brackets 1 and 2. stick.

FIG. 2 shows another embodiment of the present invention, in which the winding insulator 5
The bracket 2 and the small protrusion 5-2 are provided with a seat 5-1 and a small protrusion 5-2 on one end surface, and a screw hole 5-4 is formed on the other end surface for the seat 5-1. , the bracket 1 and the seat 5-1 are shown in cross section with a configuration in which they are fixed together by small screws 7, and FIG. 4 is a cross-sectional view of the fixed portion of the winding insulator 5 of this embodiment.

In FIG. 4, 5-1 is a seat, and 5-4 is a screw portion, and if necessary, a screw is provided in the metal insert portion.

The configuration of this example, in which only one bracket 1 is fixed with the small screw 7, allows the user to easily change several brackets 1 with different shapes as the design of the mounting structure changes. .

As mentioned above, the embodiments shown in FIGS. 1 and 2 each have seats and small protrusions provided at the front and rear ends of the winding insulator 5 to fix the stator 3 and the brackets 1 and 2. This is used to keep the relative position between the bracket and stator constant by abutting the bracket against the seat.
Moreover, since there is no need to provide the U-shaped groove 4-1 in the yoke portion of the stator core 4, the rigidity of the stator core 4 can be increased and magnetic unbalance can be eliminated.

(Effects of the invention) Since the small electric motor of the invention has the above-mentioned configuration, it has the advantage of making it easy to fix the stator and bracket together, as well as ensuring the magnetic balance and rigidity of the stator core. .

[Brief explanation of the drawing]

Fig. 1 is an enlarged view of the fixing part of the stator and bracket of the present invention, Fig. 2 is another embodiment of the present invention, and Fig. 3 is the winding insulator of the embodiment of Fig. 1 of the present invention. 4 is a partial sectional view of the winding insulator of the embodiment shown in FIG. 2, FIG. 5 is a sectional view of the small electric motor according to the present invention, and FIG. 6 is a fixation of the small electric motor according to the prior art. FIGS. 7a and 7b are detailed views of the prior art bracket, and FIG. 8 is a plan view of the stator core. Explanation of symbols, 1, 2...Bracket, 1-1,
2-1...small hole, 1-2...screw hole, 2-2...
Small hole for receiving the head of the screw, 3... Stator, 4... Stator core, 4-1... U-shaped groove, 5... Winding insulator, 5-1... Seat, 5-2 ...Small protrusion, 5-3...
... Tip portion, 5-4 ... Screw hole, 6 ... Stator winding, 7 ... Small screw, 8 ... Rotor, 8-1 ... Rotor shaft, 9 ... Bearing.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A stator core, a stator having a winding wound thereon through a winding insulator fixed to the stator core, and a stator having a winding wound thereon through a winding insulator fixed to the stator core, and a stator having a winding wire wound thereon through a small gap between the stator core and the inner diameter of the stator. In a small electric motor having a structure in which a rotor is arranged facing each other, and two brackets that rotatably support the rotor, the stator is sandwiched and fixed integrally, the brackets are attached to the end face of the winding insulator. A seat that comes into contact with the seat and a small projection having a smaller diameter than the seat are integrally formed, and
A small hole is formed in the bracket at a position facing the small protrusion, and the small hole of the bracket is fitted into the small protrusion of the winding insulator, and the bracket is brought into contact with the seat, so that the tip of the small protrusion is A small electric motor characterized by a stator and a bracket that are integrally fixed by welding. (2) The utility model claimed in claim (1), characterized in that the seats and small protrusions formed on the end face of the winding insulator are formed on both sides corresponding to both the front and rear brackets. Small electric motor. (3) A seat and a small protrusion are integrally formed on one side of the end face of the winding insulator, and a screw hole is integrally formed in the seat on the other side, and one bracket is fixed with a small screw. A small electric motor according to claim (1) of the utility model registration claim. (4) The small electric motor according to claim (3) of the utility model registration, characterized in that a screw hole is formed by inserting a metal part into one seat provided on the end face of the winding insulator.