JPS6026497Y2 - electric motor stator - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a stator for an electric motor having a simplified winding assembly structure.

Electric motors in which the stator is formed by winding coils around an iron core in a toroidal manner are very advantageous in reducing the size and weight of the electric motor because there are few folded parts of the coil that protrude from both end faces of the iron core, so-called coil end parts. Due to linear relationships, the core is generally divided into a plurality of parts.

However, in the winding process, the opening of each slot is generally narrowed to reduce uneven rotation and improve operating efficiency, making it difficult to store the coil into the slot from this opening and making assembly difficult. There is a problem in that it requires a large amount of man-hours.

For this reason, the core 11 is divided into a plurality of core pieces 11a within each slot 12, as shown in FIG. However, after a bobbin 16 on which a winding wire 15 has been previously applied is attached to the yoke portion 13 of the slot 12, the respective core pieces 11a are joined to form a stator.

However, since the yoke portion 13 of the slot 12 is generally formed in an arc shape along the rotor, there is a problem in that it is difficult to insert the bobbin 16. Especially when the number of slots is small and the yoke portion 13 of the slot 12 is long. This problem becomes more noticeable because the insertion process becomes longer for some devices.

Furthermore, since the bobbin 16 is also formed into an arc-shaped hollow cylinder, winding the coil uniformly around the bobbin requires special ingenuity in the winding machine, and due to the shape of the slot 12a, the bobbin Since the flanges 16a at both ends of the coil 16 are inclined inward, there is a problem that the coil is easily caught in the windings at both corners.

This invention was made in view of these circumstances,
The winding assembly structure has been simplified by dividing the iron core within the slot, making the yoke part of the slot where the winding is applied straight, and attaching a bobbin wrapped with a coil to this yoke part. The purpose is to provide stators for electric motors.

The present invention will be explained below based on an embodiment shown in the drawings.

Fig. 1 is a perspective view of the stator core according to the present invention, Fig. 2 is a cross-sectional view of the assembled stator with a bobbin wound with coils attached to the first stator core, and Fig. 3 is a cross-sectional view taken perpendicular to the rotation axis. The figure is a sectional view perpendicular to the rotating shaft showing how a bobbin wound with a coil is attached to the divided stator core parts, and FIG. 5 is a perspective view showing FIG. 3 in an easy-to-understand manner.

In Fig. 1, 1 is a stator core, 2 is a slot, 3 is a yoke portion of slot 2, and 4 is formed to have almost the same curvature as the rotor (not shown) placed in core 1. It has iron core teeth.

The slot 2 is formed such that the intersecting angle α between the yoke portion 3 of the slot 2 and the side wall portion 7 of the core tooth 4 is approximately 90°.

As shown in FIG. 2, the winding 5 is formed by winding a coil in a toroidal shape around a bobbin 6 made of resin or the like, and the bobbin 6 is attached to the yoke portion 3 of the slot 2.

Further, the core 1 is divided within each slot 2 into a total of three core pieces 1a, and protrusions 1b and lc are formed at the divided portions at both ends of the core piece 1a.

The protrusions 1b and lc are formed so that they can be fitted into each other, and the three iron core pieces 1a are joined together to form the iron core 1 by their fitting.

In the above configuration, the stator is assembled by first winding a coil around the bobbin 6 in a toroidal shape to form the winding 5.

Next, the bobbin 6 with the winding 5 is attached to the yoke part 3 of the iron core piece 1a.
Insert and attach.

Thereafter, the three core pieces 1a to which the bobbin 6 is attached are joined together so that the respective protrusions 1b and lc fit together to form a stator.

According to the above configuration, since the yoke portion of the slot 2 has a straight shape, it is extremely easy to install the bobbin 6.
Assembly man-hours can be significantly reduced.

Further, since the bobbin 6 also has a straight winding portion, winding the coil is extremely simple, and high-speed winding is possible without requiring a special winding machine or the like.

In addition, the yoke portion 3 of the slot 2 and the side wall portion 7 of the core tooth 4
Since the intersecting angle α is approximately 90°, the collar 6a of the bobbin 6 can be formed parallel to the winding direction, so the coil can be hooked to the collar 16a at both corners of the bobbin 6 during winding. This eliminates the possibility of such problems, and it becomes easy to wind the wire uniformly within the slot 2.

In particular, when the iron core is divided into three parts and the number of slots is three as shown in this embodiment, since the yoke part 3 of the slot 2 becomes long, the insertion stroke of the bobbin 6 and the bobbin 6
Since the winding process is longer, it is possible to obtain a significant effect compared to the conventional method, and it is practical because the number of divided cores is small, and it is possible to easily configure a three-phase winding. can.

On the other hand, it is obvious that the same implementation is possible even if the number of slots is changed.

Furthermore, with the above configuration, even if the width of the core teeth 4 is widened and the opening of the slot 2 is made small, there will be no problem in the assembly process, making it easy to reduce uneven rotation and improve operating efficiency. It has the advantage of being.

As explained above, according to the present invention, it is possible to obtain a stator for an electric motor with a simplified winding assembly structure.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the stator core according to the present invention, Fig. 2 is a cross-sectional view of the assembled stator with a bobbin wound with coils attached to the first stator core, and Fig. 3 is a cross-sectional view taken perpendicular to the rotation axis. The figure is a cross-sectional view perpendicular to the rotating shaft showing how a bobbin wound with coils is attached to the divided stator core. Figure 4 shows a conventional toroidally wound stator perpendicular to the rotating shaft. FIG. 5 is a perspective view showing FIG. 3 in an easy-to-understand manner. 1.11... Iron core, 2,12... Slot, 3,1
3... Yoke part, 5, 15... Winding wire, 6, 16...
・Bobbin, 7...Side wall part, α...Cross angle.

Claims (3)

[Scope of utility model registration request] (1) In an electric motor having a stator in which the iron core is wound in a toroidal manner, the iron core is divided into slots, and the yoke portion of the slot where the winding is applied is made into a straight shape, and this yoke portion is A stator for an electric motor, characterized in that a coil is wound around the stator. (2) The stator for an electric motor according to claim 1, characterized in that the iron core is divided into three parts and the number of slots is three. (3) A stator for an electric motor according to claim 1 or 2, characterized in that the intersecting angle between the yoke portion of the slot and the side wall portion of the tooth is approximately 90° or more. .