JPS587826Y2 - Coreless rotating equipment - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a winding structure in rotating equipment such as coreless motors and coreless generators.

2. Description of the Related Art Coreless type motors in which the rotor is formed into a hollow cylindrical shape have come to be used as small DC motors used in cassette tape recorders and the like.

This coreless motor has advantages over conventional iron core type motors, such as better start-up/stop response and higher conversion efficiency.

The rotor of a coreless motor is made up of a group of interconnected annular conductors formed into a hollow cylindrical shape, and conventionally known configurations in which each conductor is wound in a diamond shape, hexagonal shape, square shape, etc.

FIG. 1 shows a rotor 2 of a coreless motor with the rhombic winding as an example.

To make this rotor 1, first, as shown in FIG. 2, a winding 3 is wound a predetermined number of times around the circumferential surface of a core material 2 whose cross section 2a is rhombic in shape.

Next, after removing the core material 2 from the winding 3, as shown in FIG.
A and 3b are crushed while being pulled in opposite directions in the axial direction indicated by the arrows to form the state shown in FIG.

・Next, by overlapping and gluing the ends 3a and 3b of the winding 3 shown in FIG. 4, the hollow cylindrical rotor 1 shown in FIG.
can be obtained.

This rotor 10 has a diamond-shaped conductor 1 as shown by the thick line.
A conductor group consisting of a is formed.

By the way, the torque of a permanent magnet DC motor is generally
It is determined by the back electromotive force constant Kv, which is related to the structure, material, and shape of the motor itself, and the externally applied current i.

The back electromotive voltage constant Kv is expressed as Kv=B7r (2), where the magnetic flux density interlinking with one conductor is B1, the length of the conductor is 21, and the distance from the cylindrical axis to the point of application of force is r.

The torque T generated by the meeting is T=Btir=KvXi ■ It is expressed as

Therefore, it is preferable to make the current i as small as possible to obtain a large torque T, and for this purpose, it is desirable to make Kv as large as possible from the above equation (2).

However, it has not been possible to obtain a sufficiently large Kv with the conventional rhombus-wound rotor.

The present invention was developed in view of the above-mentioned circumstances, and the annular conductor of the rotor is formed as a parallelogram excluding rhombuses, squares, and rectangles.

As a result, it is possible to obtain such a coreless type rotary device with large torque and good productivity.

Embodiments of the present invention will be described below with reference to the drawings.

5-8 show the steps for obtaining a parallelogram-wound rotor 11 according to the present invention, which is formed in the same manner as the diamond-wound rotor 11 shown in FIGS. 1-4.

That is, first, as shown in FIG. 5, the shape of the cross section 12a is rhombic;
The winding 13 is wound a predetermined number of times around the circumferential surface of the core material 12 which is shaped like a parallelogram excluding squares and rectangles.

Next, after removing the core material 1.2 from the winding 13, as shown in FIG. While pulling each other in opposite directions, they are crushed to form the state shown in Fig. 7.

Next, by overlapping and bonding the ends 13a and 13b of the winding 13 shown in FIG. 7 to each other, the hollow cylindrical rotor 11 shown in FIG. 8 can be obtained.

On the circumferential surface of the rotor 110, a conductor group of parallelogram-shaped conductors 11a as shown by thick lines is formed.

Next, the characteristics of the rotor 11 according to the present invention and a conventional rotor will be compared.

FIG. 9 shows a parallelogram-wound rotor 11 according to the present invention, a conventional rhombus-wound rotor 1, a hexagonal-wound rotor 21, and so on. A schematic diagram of a square-wound rotor 31, in which each rotor 11, 1, 21, 31
Annular conductors 11a, 1a, 21a of respective shapes are provided on the circumferential surface of the
, 31a are shown, and each conductor is wound at a pitch angle θ.

Each rotor 11, 1, 21, 31 has a length t in the axial direction.
1, and in the rotor 11.21, the conductors 11a, 2
The length 2 t2 of the side parallel to the above-mentioned axis of 1a is t2 = βt1 (however, β knee), and in the rotor 1, from the top of one of the rhombic conductors 1a to the rotor 1a, Let the length at the cylinder side edge 1 be 11.

FIG. 10 is a characteristic diagram showing the results of calculating the back electromotive force constant Kv with respect to the pitch angle θ of the rotors 1, 11, 21, and 31, and the curve shown by the thick line is the characteristic of the parallelogram-wound rotor 11. So, β=0.6°0.7, 0.8, respectively.
The case of 0.9 is shown.

The curves shown by solid lines are the characteristics of the hexagonally wound rotor 21, and β
The case where =0.2°0°4, 0.6 is shown.

The curve shown by the broken dotted line is the characteristic of the rhombus-wound rotor 1a, and the curve shown by the chain line is the characteristic of the square-wound rotor 31.

Note that point a of each curve indicates the point where the back electromotive voltage constant Kv is maximum, that is, the torque is maximum.

In addition, these characteristics are based on a motor using two-pole permanent magnets, and when the length t7 of each rotor 1゜11.21, 31, radius, voltage, internal loss, magnetic flux density, etc. are constant. be.

In FIG. 10, the parallelogram-wound rotor 11 according to the present invention can obtain at least a larger torque than the rhombus-wound rotor 1a by setting β to a value smaller than 0.6; By increasing the size, it is possible to obtain approximately the same torque as that of the hexagonally wound rotor 21.

Also, in the hexagonal-wound rotor 21, when β changes, the pitch angle θ for obtaining point a changes, but in the parallelogram-wound rotor 11,
The pitch angle θ at point a is approximately constant at 90°.

Also, in FIG. 9, the conductors 11a and 2 of the rotors 11 and 21 are
The other sides, which are different from the pair of sides parallel to the axis of 1a (the sides with length t2), do not contribute to torque generation.

Therefore, by increasing the length t2 of the conductor 11a to make its cylindrical shape longer in the axial direction, the magnetic flux linkage of the conductor 11a can be increased without changing the lengths of the other sides, that is, without changing the pitch angle θ. The torque can be increased by increasing the torque.

Therefore, regardless of the pitch angle θ, the length t of the rotor 11 is simply
This is particularly effective when applied to a motor having an elongated cylindrical shape, since the torque can be increased simply by increasing l.

Furthermore, since the back electromotive voltage constant Kv is large, a motor with good speed regulation and less variation in rotational speed can be obtained.

In order to compare the conductors 11a, 21a, and 31a of FIG. 9, FIG. 11 shows the conductors 11a, 21a, and 31a in FIG.

As is clear from FIG. 11, the square-wound conductor 31a has the largest area, and the parallelogram-wound conductor 11a and the hexagonal-wound conductor 21a have the same area.

Therefore, the amount of flux linkage is the largest in the conductor 31a, and Kv becomes large as shown in FIG.

However, if the total lengths of each conductor are compared, it is clear that the length of the conductor 11a is the shortest.

That is, the resistance of the conductor 11a is the lowest, and therefore, the requirement to obtain a large torque T by reducing the current i to the extent possible can be satisfied as described in the equation (2) below.

! In the case of the conductor 31a, when a hollow cylinder is formed by the conductor group of the conductor 31a, the windings forming the horizontal sides of the rectangle are stacked in multiple layers at the top and bottom of the cylinder, and this part becomes thicker to balance the cylinder. becomes lacking.

This also causes variations in the dimensional accuracy of the rotor, resulting in unstable operation as a rotor.

In contrast, in the case of a parallelogram-wound conductor 11a, even if it is formed into a hollow cylinder as shown in FIG. 8, each conductor 11a is slightly shifted at its upper and lower parts, so the above problem does not occur. A rotor with good stability and productivity can be obtained.

Although the motor has been described above, the parallelogram-wound rotor 11 can also be applied to a generator.

The present invention provides a coreless rotating device having a rotor formed in a hollow cylindrical shape with a group of annular conductors on its sides, in which the annular conductor is formed into a parallelogram shape other than a rhombus, a square, and a rectangle; The present invention relates to a coreless rotating device characterized in that the long side of the parallelogram (for example, the side of length t2 of the conductor 11a in FIG. 9) is arranged substantially parallel to the axial direction of the rotor.

Therefore, according to the present invention, it is possible to reduce the winding resistance while maintaining a sufficiently large back electromotive force constant, so compared to conductors with other winding shapes, when oscillating at the same voltage, the current i It is possible to obtain large torque while reducing the

Moreover, a coreless rotating device with good speed regulation, stable dimensions, shape and operation, and high productivity can be obtained.

[Brief explanation of drawings]

Figure 1 is a perspective view of a rhombus-wound rotor, Figures 2-4 are perspective views showing an example of the manufacturing process of the rotor shown in Figure 1, and Figures 5-8 are of a parallelogram-wound rotor according to the present invention. FIG. 9 is a schematic perspective view of a conventional rotor and a rotor according to the present invention. FIG. 10 is a characteristic diagram of a conventional motor and a motor according to the present invention. FIG. 11 is a perspective view showing an example of the manufacturing process. is a diagram in which conductors of various shapes are superimposed. In addition, according to the symbols used in the drawings, 11 is a parallelogram-wound rotor, 11a is an annular conductor, 12 is a core material, and 13 is a parallelogram-wound rotor.
is a winding.

Claims (1)

[Scope of utility model registration request] In a coreless rotating device having a rotor formed in a hollow cylindrical shape having a group of annular conductors along the circumference, the annular conductor is formed into a parallelogram other than a rhombus, a square, and a rectangle, and the parallelogram A coreless rotating device characterized in that a long side of the rotor is arranged substantially parallel to the axial direction of the rotor.