JPH0736677B2 - Electric motor stator - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator of an electric motor in which a stator winding is wound around a bobbin and the stator winding is mounted on a stator iron core.

2. Description of the Related Art In recent years, in order to streamline stator winding work and assembly work of electric motors, the number of electric motor stators in which a stator winding is directly wound around a bobbin and attached to a stator iron core has also increased in capacitor induction motors. Came.

The stator is manufactured by winding a stator winding around a bobbin molded from an insulating resin material, winding the beginning and end of the winding around a pin that stands on the edge of the bobbin, and winding each pole. It has been a conventional general method to separately produce the core winding, attach it to a separate type core, and then connect each pole winding with a printed circuit board or the like.

The structure of these conventional stators will be described below with reference to FIGS. 6 and 7. That is, in the figure, 21a to 21d are bobbins made of an insulating material in which a fixed winding 22 is directly wound inside a U-shaped groove, and the winding start and end of the stator winding 22 are respectively wound around the bobbins. Sex pin 23 is standing. The wound bobbins 21a to 21d are mounted on the stator iron core A24 from the outside, and these are further mounted on the inner surface 25 of the stator iron core B25.
After press-fitting into the bobbin, the printed circuit board 26 was mounted on the bobbins 21a to 21d, and the respective stator windings 22 and the lead wires 27 were connected.

Problems to be Solved by the Invention In such a conventional configuration, as the electric motor becomes smaller and the outer diameter becomes smaller, the outer diameter of the printed board 26 also becomes smaller and the printed board connecting the lead wire 27 and the pin 23. 26 The problem that the insulation distance between the conducting parts 28 above cannot be maintained, and in the case of an electric motor used under high humidity conditions, the printed circuit board 26
However, there is a problem in that the conductive parts 28 on the printed circuit board 26 cause a leak due to the absorption of moisture.

The present invention solves such a problem, and a stator having a structure in which the stator winding 22 is wound directly around the bobbin 21 even when the electric motor is downsized and is used under high humidity conditions. It is intended to provide.

Means for Solving the Problems In order to solve the above problems, the present invention has a plurality of housing grooves for housing a lead wire on the outer surface of a U-shaped groove having a sectional shape on which a stator winding is directly wound. Then, a stator of an electric motor in which a bobbin made of an insulating material in which a pawl for locking the lead wire is projected from an outer surface of the U-shaped groove between the storage grooves is attached to a stator iron core. It is composed.

With this configuration, the lead wires can be wired along the outer peripheral surface of each bobbin and directly connected to the stator winding without using a printed circuit board, and the lead wires can be stored in multiple storage grooves. The lead wire is held and fixed to the bobbin by keeping the lead wires in a closed state and locking the lead wire holding grooves.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. In the figure, 1a to 1d are bobbins made of an insulating material for directly winding the stator winding 3 around the U-shaped groove 2, and the edges of the bobbin are formed by winding the start and end of the stator winding 3, respectively. 2 is formed on the outer side surface of the U-shaped groove 2 in which the lead wire 5 is accommodated. Then, the triangular pawl 7 for locking the stored lead wire 5 so as not to come off is formed in the storage groove 6
It is projected from the outer side surface of the U-shaped groove 2 between them. In the drawing, 8 is a stator iron core A on which the bobbins 1a to 1d are mounted, 9 is a stator iron core A8 into which the stator iron core A8 is press-fitted into the inner surface 10, and 11 connects the respective stator windings 3. It is a crossover with an insulating coating.

In the above configuration, the stator winding 3 is wound directly around the U-shaped groove 2, and the bobbin 1 in which the winding start and winding end are wound around the pin 4 is mounted on the stator iron core A8 from the outside for each pole. Then, these are pressed into the inner surface 10 of the stator iron core B9. Next, the bobbin 1a and 1c facing each other, or the winding end (or winding start) of the bobbin 1d are connected by the crossover wire 11, and the lead wire 5 is directly connected to the remaining pin 4. Next, the work of holding and fixing the crossover wire 11 and the lead wire 5 to the bobbins 1a to 1d will be described below.

Crossover 11 and lead wire 5 in a shape that allows pawl 7 to escape downward
After being bent and placed in the storage groove 6 to be in the unattached state, both ends of the crossover wire 11 and the lead wire 5 are pulled and stored in the storage groove 6, and the crossover wire 11 and the storage groove 6 of the lead wire 5 are stored.
The gap is locked at the lower end of the claw 7, or the crossover 11
After placing the lead wire 5 and the lead wire 5 on the inclined surface of the pawl 7 and laying them in the two storage grooves 6 in a private state, pressing the crossover wire 11 and the lead wire 5 to the bottom side of the storage groove 6 While moving to the outer wall side of the storage groove 6 along the inclined surface of the pawl 7, the outer wall of the storage groove 6 is pushed and bent outward, whereby the tip of the pawl 7 and the outer wall of the storage groove 6 are pushed. The crossover wire 11 and the lead wire 5 are housed in the housing groove 6 through a gap generated between the housing surface 6 and the housing groove 6 of the crossover wire 11 and the lead wire 5, and only the lower end of the pawl 7 is engaged. It can be completed with a simple task.

In addition, since the pawl 7 projects from the outer surface of the U-shaped groove 2 between the storage grooves 6, and the storage groove 6 and the pawl 7 do not overlap on the outer surface of the U-shaped groove 2, the bobbin 1a. ~ 1d storage groove 6
And the mold structure for molding the pawl 7 can be simplified.

As described above, according to the present embodiment, the stator windings 2 of the bobbins 1a to 1d can be directly connected by the insulated crossover wire 11 and the lead wire 5 without using a printed board, and these can be stored and held. With the configuration, the electric motor can be downsized and can have moisture resistance, and the work of storing and holding the crossover wire 11 and the lead wire 5 can be easily performed.

In the embodiment, two storage grooves 6 and pawls 7 are provided between the storage grooves 6 on the outer surface of the U-shaped groove 2 to connect the crossover wire 11 and the lead wire 5 to the bobbins 1a to 1d. The holding and fixing is not limited to this, but the number of the storage grooves 6 is increased according to the size of the bobbin, the pawl 7 is provided between these storage grooves 6, and the crossover wire 11 and the lead wire 5 are provided. It may be held and fixed on the bobbin without causing any difference in its action and effect.

EFFECTS OF THE INVENTION As is apparent from the above description of the embodiments of the present invention,
An electric motor having a structure in which the stator winding is directly wound around the bobbin and mounted on the stator iron core, downsizing and moisture resistant specifications are possible, and the work of holding and fixing the lead wire to the bobbin can be easily performed. Further, the mold structure for molding the storage groove and the pawl of the bobbin can be simplified, and its practical effect is great.

[Brief description of drawings]

1 is a plan view showing a stator of an electric motor according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA 'in FIG. 1, and FIG. 3 is a plan view showing a bobbin of the stator. Fig. 4 is the same front view, No. 5
FIG. 6 is a right side view of the same, FIG. 6 is a front view of a stator of a conventional electric motor, and FIG. 7 is a sectional view taken along line YY 'of FIG. 1 ... Bobbin, 2 ... U-shaped groove, 3 ... Stator winding,
5 ... Lead wire, 6 ... Storage groove, 7 ... Claw, 8 ... Stator core A, 9 ... Stator core B.

Claims (1)

[Claims] 1. A cross-sectional shape on which a stator winding is directly wound has a plurality of accommodating grooves for accommodating lead wires on the outer surface of the U-shaped groove, and the U-shaped groove between these accommodating grooves. A stator of an electric motor in which a bobbin made of an insulating material having a claw protruding from the outer surface of the stator is provided on a stator iron core.