JPS585404Y2 - Electric motor - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electric motor that improves the insulation of a stator coil.

In general, electric motors are widely used and widespread in various industries and home appliances.

These electric motors are flattened and miniaturized due to space constraints with other equipment components that are incorporated therewith.

Since this type of electric motor is flat, the stator is molded to be as thin as possible, and the rotor is molded to be similarly thin, making it difficult to attach the stator end and the load member. The distance to the end of the rotor is extremely close.

However, if the end of the stator and the end of the rotor on which the load member is attached are close to each other, depending on the type of load member, the load member and the coil provided in the stator may come into contact with each other. However, there is a risk that the insulating coating of the coil may peel off, posing an electrical hazard or causing deformation and damage to the load member.

Therefore, this invention was developed in view of the above-mentioned circumstances, and its purpose is to create a motor that can improve the insulation of the stator coil and prevent contact between the stator coil and the load member. It is about providing.

An embodiment of this invention will be described below with reference to the drawings.

Reference numeral 1 in FIG. 1 denotes an electric motor, which is mainly composed of a rotor 2, a bearing 3 that supports the rotor 2, and a stator 4 that surrounds the rotor 2.

The rotor 2 has a rotor core 5 formed by die-casting.
It is composed of a rotor main body 6 formed by integrating the molded member into a cylindrical shape and bulging out to one end side of the rotor core 5, and a rotating shaft 7 passing through the center of the main body 6. One end side of the shaft 7 is supported by the bearing 3.

A fan 8 is disposed on the end face of the rotor 2, and is attached to the end face with a screw 9 screwed into the rotor body 6.

The stator 4 concentrically surrounds the rotor core 5,
and a stator core 10 facing the circumferential surface of the rotor core 5.
and a coil 11 wound around this stator core 10.

The stator 4 is fitted into a housing 12 that concentrically surrounds one end of the stator 4.

As shown in FIG. 2, the stator core 10 is formed by stacking and tightly fixing a plurality of hollow circular laminated steel plates.

In the outer peripheral edge of the stator core 10, notches 13 are formed in the vertical and horizontal directions in the figure.

The cutout portions 13 are continuously formed between both end faces of the stator core 5.

Further, on the inner peripheral side of the stator core 10, a plurality of slots 14 are formed at equal intervals along the circumferential direction, and the coils 11 are inserted into these slots.

Both extending ends of this coil 11 are connected to the stator core 10.
The bent portion 11a is bent almost at right angles toward the outer circumferential direction of the
is formed.

An insulator 17 made of an electrically insulating material is inserted into the end face of the stator core 10 on the side where the fan 8 is mounted, and is positioned inside the outer periphery of the coil 11. It is pressed by the curved portion 11a.

This insulator 17 is formed into a hollow disk shape with a size approximately equal to the end face of the stator core 10, and has positions corresponding to the notches 13 on the outer periphery of the insulator 17. A bent portion is formed in the

This bent portion is formed by bending a part of the outer periphery of the insulator 17.

In the center of the housing 12, this housing 12
A cylindrical bearing support portion 18 is provided, and the bearing 3 made of, for example, a porous sintered metal member is inserted into the bearing support portion 18 .

A lubrication supply member 19 for supplying lubricating oil to the bearing 3 is disposed at both ends of the bearing 3.

A coil cover 15 that covers the coil 11 is attached to the other end of the stator 4 .

As shown in FIG. 3, this coil cover 15 consists of a hollow disk-shaped clay wall board 20, inner and outer peripheral wall boards 21 and 22 provided at the inner and outer peripheral ends of this main wall board 20, and one outer peripheral wall. It consists of a protrusion 23 provided at the peripheral end of the plate 22, and these are integrally formed of an electrically insulating member.

The protrusion 23 is formed in a band-like shape and protrudes from the peripheral edge of the outer peripheral wall plate 22, and this protrudes from the notch 13.
Four of them are disposed at the peripheral edge portion corresponding to the number of .

The protrusion 23 has an engaging claw 24 formed by bending the protruding end inward, and a presser claw 25 integrally extending inside the base. ... is formed.

These engaging claws 24... and presser claws 25...
・are opposite each other.

Then, as shown in FIG. 4, the protrusion 23 is inserted into the notch 13, and the respective engaging claws 24 and presser claws 25 are engaged with the peripheral edges of both end faces of the stator core 10,
The coil cover 15 is fixed to the stator core 10 by this engagement.

Next, the procedure for assembling the electric motor 1 will be explained.

As shown in FIG. 4, with the rotor 2, bearing 3, stator 4, and lubricant supply member 19 already installed in the housing 12, when installing the insulator 17, first cut the notch in the stator core 10. The bent portions of the insulator 17 are made to face the portions 13 , and the insulator 17 is fitted onto the outer periphery of the coil 11 .

Then, the extending end of the coil 11 is bent toward the outer circumference of the stator core 10, that is, in the direction of arrow A, and the insulator 17 is placed between the extending end of the coil 11 and the upper surface of the stator core 10 in the drawing. to hold.

The insulator 17 is attached to the upper surface of the stator core 10 by these.

Next, the coil cover 15 is attached.

To install this coil cover 15, first install the coil cover 1.
5 and the notch 13 of the stator core 10 are made to face each other.

Then, lower the coil cover 5 along the direction of arrow B,
The protrusion 23 is inserted into the notch 13 formed by the circumferential surfaces of the stator core 10 and the housing 12, using the circumferential surface of the housing 12 as a guide surface.

With this insertion operation, the engaging pawl 24 is held between the surface of the notch 13 and the circumferential surface of the housing 12 and is elastically bent.

When the protrusion 23 is further inserted, the holding claw 25 elastically comes into contact with the upper surface of the stator core 10 in the figure, and the engaging claw 24 that was elastically bent returns accordingly, and the stator core 10 in the figure It is elastically abutted against the lower surface.

Due to the contact between the holding pawl 25 and the engaging pawl 24, they elastically engage the stator core 10 and the coil cover 15 is supported.

Next, the fan 8 is attached.

As shown in FIG. 1, a fan 8 is fitted onto the end of the rotating shaft 7, and screws 9 are inserted into the fan 8 to attach it to the end surface of the rotor body 6.

The assembly of the electric motor 1 is completed by these assembling procedures described above.

In this way, the bent portion of the insulator 17 is fitted into the notch 13 to restrict movement in the left-right direction, and the insulator 17 is pressed against the end surface of the stator core 10 by the coil 11, so that the insulator 17 can move in the vertical direction. Since the movement is restricted, it can always be kept in a predetermined position without being accidentally detached due to vibrations caused by the rotation of the electric motor 1 or vibrations caused by carrying the electric motor 1.

Moreover, the notch portion 13 provided on the end face of the stator core 10...
By simply inserting the protrusion 23 of the coil cover 15 into the stator core 10, the protrusion 23 is reliably engaged with the stator core 10, thereby attaching the coil cover 1 to the stator core 10.
5 is attached, the coil cover 15 can be reliably attached to the stator 4 with a simple operation.

In addition, the coil 11 of the stator core 10 is covered with a coil cover 15.
Therefore, since the cover coil 11 is not exposed to the outside, the insulation of the coil 11 can be improved and contact between the coil 11 and the fan 8 can be prevented.

Note that this invention is not limited to the above embodiments.

For example, in the above embodiment, the coil cover is attached only to the end face of the stator on the side where the fan is installed, but even if a coil cover similar to this is attached to the end face of the stator on the side where the fan is installed, there will be no problem. I can't help it.

As explained above, according to this invention, a coil cover made of an insulating material is provided on the end face of the stator to cover the coil, a protrusion is formed at the peripheral end of the coil cover, and a protrusion is formed on the protrusion. A hooking claw and a holding claw opposing the hook are provided, and these claws are engaged with the peripheral edge of the stator to attach the coil cover, so the coil cover can be attached with simple work and the coil cover can be used to secure the coil cover. This has the effect that the insulation of the child coil can be improved and contact between the stator coil and the load member can be prevented.

[Brief explanation of drawings]

The drawings show an embodiment of the invention, with FIG. 1 being an overall sectional view, FIG. 2 being a side view of the motor with the coil cover removed, and FIG. 3 being an overall perspective view showing the coil cover.
FIG. 4 is a partially enlarged sectional view showing a state in which the coil cover is attached. 1...Electric motor, 2...Rotor, 3...
... Bearing, 4 ... Stator, 15 ...
・Coil cover, 23... Protrusion, 24...
... Engaging claw, 25... Presser claw.

Claims (1)

[Scope of utility model registration request] A coil cover made of an insulating member that covers the coil on an end face of the stator, in a stator that includes a rotor, a bearing that supports the rotor, and a coil that surrounds the rotor. A protruding part is formed at the peripheral end of the coil cover, and this protruding part is provided with an engaging pawl at the protruding end and a presser pawl opposite to the engaging pawl, and these pawls are attached to the stator. An electric motor characterized in that a coil cover is fixed by being engaged with a peripheral portion.