JPS58186343A - Stator for motor - Google Patents

Abstract

PURPOSE:To improve the space factor of a coil and to increase the efficiency of the stator for a motor by crossing central lines of a central hole around the hole in such a manner that equal angles are displaced, substantially perpendicularly crossing and forming pole teeth across the ends of the coil legs for the coil. CONSTITUTION:Central lines A of a central hole 1 are crossed around the hole 2 in such a manner that equal angles are displaced at 90 deg. from each other and the lines A are displaced from the center of the hole 2 in coil legs 3a-3d. Pole teeth 4a-4d of arcuate shape in plane are integrally formed to substantially perpendicularly cross at the ends of the legs 3a-3d. The teeth 4a-4d are formed at the legs at the positions slightly displaced from the center of longitudinal direction, the center line B for connecting the centers of the poles 4a, 4c or 4b, 4d pass the center of the hole 2 so as to be parallel to the line A.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stator for a motor such as a brushless motor.

Fig. 1 shows a conventional example of a stator in this type of motor in which the rotor is composed of permanent magnets.The stator yoke l' has windings arranged 90 degrees apart radially from a center hole i. Legs 3a @ 3b #3e, M, and nine magnetic pole teeth 4m, 4b, which are connected to the tips of the winding legs in a manner that is significantly shifted along the rotational direction.

4e and 4-, and the center line A of the winding leg and the center line a of the magnetic pole tooth are not evenly distributed but intersect with each other at a slight angle.

Therefore, when coils (aEI not shown) are wound around the winding legs 3a to 3d while rotating the stator winding 1 about the center line becomes very narrow as shown by 8 in the figure,
There is a drawback that the required number of turns cannot be secured.

On the other hand, in the case where the coil is wound around the center line B as the center of rotation, the traverse expands as shown by R in the figure, but according to this, the coil is wound along the inner surface of the magnetic pole teeth 41 to 4d. The wire legs 31' to 3d' are wound diagonally, which has the disadvantage that the space factor becomes extremely poor.

The present invention was proposed in view of the above points, and its purpose is to dramatically improve the space factor of the coil and to expand the trap path of the coil. K is there to provide a stator of efficiency.

Hereinafter, the present invention will be explained along with the drawings.

FIG. 2 shows a stator quadrilateral 1 used in a stator according to the present invention. KL&II so that the -mm is offset from the center of the center hole 20.
I legs 3m and 3 are provided with legs 3e and 3d, respectively.

9. At the tips of these winding legs 3a to 3-, there are magnetic pole teeth 4 m + 4 in the shape of a thousand-faced arch so as to be substantially orthogonal to each of them.
b #4@-44 are integrally connected to each other. These magnetic pole teeth 41 to 4d are connected to the winding legs 31 to 34 at a position slightly offset from the center of each length,
The center IIB connecting the center portions of the opposing magnetic pole teeth 4m and 4b and 44 is far from the center of the center hole 2) and is parallel to the center IIA.

Therefore, the center ll of the magnetic pole teeth 4a to 4d! The coils are wound using the so-called flyer method, in which the stator yoke 1 is rotated around I as the central axis, or the stator yoke 1 is fixed and the coil (not shown) is rotated in a plane perpendicular to the center IIB. Then, depending on the positional relationship of the adjacent magnetic pole teeth, the part indicated by i in the figure can be used as a trap path. Therefore, the coils are wound on the winding legs 31 to 34.
The winding legs 31 to 3 are arranged along the magnetic pole teeth 41 to 4d substantially orthogonal to the magnetic pole teeth 41 to 4d.
4, a significant improvement in the space factor can be expected, and by appropriately selecting the length and width of each magnetic pole tooth 41 to 4d, a trap path of sufficient width can be ensured.

In this embodiment, a four-pole configuration has been described, but it goes without saying that the number of poles can be increased or decreased as appropriate.

3 and 4 show a brushless motor using a stator according to the present invention. In the figures, 5 is a rotor made of permanent magnets arranged coaxially around the stator;
6 is a shaft, 7 is a bearing, 8 is a bearing case, 9 is a motor yoke, IO is a coil, and 11 is a fixing plate.

As described above, according to the present invention, the center lines are arranged around the center hole so that they intersect with each other at equal angles, and the center lines are offset from the center of the center hole. A plurality of winding legs are respectively arranged, and magnetic pole teeth are arranged in a row at the tip of each of these winding legs so as to be substantially orthogonal to each other, and the magnetic pole teeth are connected through the center hole and are opposed to each other through the center hole. The stator is equipped with a stator ring in which the center line connecting the magnetic pole teeth is located approximately 1,000 rows from the center of the winding leg, improving the space factor of the coil and expanding the coil trap path. This has the effect of providing an efficient and high-performance stay 1, as well as a brushless motor.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a conventional stator L-L, FIGS. 2 to 4 show an embodiment of the present invention, FIG. 2 is a plan view of a stator L-L, and FIG. FIG. 4 is an exploded perspective view of a brushless motor using the brushless motor, and FIG. 4 is a longitudinal cross-sectional view as well. l... Stator yoke, 2... Center hole, 3a to 3d
... Winding leg, 4a to 4d... Magnetic pole tooth, 10... Coil, ^. B...center line, T...trapass. Figure 1A' Figure 2

Claims (1)

[Claims] In a motor having a rotor made of permanent magnets, each of the centers is arranged around a center hole and intersects with each other at equal angles, and the center 10 lines of these lines are arranged in a circle offset from the center of the center hole. A plurality of 0 windings*11 are arranged respectively, and the 11K magnetic pole teeth at the ends of these wire legs are arranged in a row so as to be substantially orthogonal to each other, and the windings are passed through the center hole, and through the center hole. A stator ring in which a center line connecting mutually opposing magnetic pole teeth is positioned substantially parallel to a center line of the winding leg.
A stator for a motor characterized by being equipped with.