JPS6135785B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention allows the winding 1 to pass diagonally through one pole of the magnetic field, and is folded back diagonally at a portion transitioning from one pole of the magnetic field to the next pole. In a coreless motor rotor that is constructed by sequentially stacking the folded parts 2 of the winding 1 in a cylindrical shape such that the folded parts 2 are arranged on the same circumference, the stacking pitch of the folded parts 2 of the winding 1 is calculated as The stacking pitch of the folded parts 2 is made smaller, and the insulating coating of the folded parts 2a connected to the commutator pieces 5 of the folded parts 2 is peeled off to form the current carrying part 9. The rotor of a coreless motor is characterized in that it is electrically connected to the piece 5, and its purpose is to:
The winding is simple and easy to manufacture, and the coil has a high roundness.Moreover, there is little disturbance in the winding at the tap pull-out part, which reduces the risk of rare shorts and wire breaks, and allows the coil to rotate at high speed. To provide a rotor for a coreless motor that does not sometimes cause inconvenience.

Coreless rotors for coreless motors with cylindrical windings have conventionally been provided, but conventional rotors are basically formed into a cylindrical shape by winding the winding 1 diagonally as shown in Figure 3. It was done. In other words, as shown in Fig. 5, the winding 1 is first wound diagonally from point A to point B, then turned back diagonally at point B, then wound diagonally again to point C, turned back diagonally at point C, and then wrapped around two more points. The coil was wound diagonally up to the point 1, and then wound sequentially from point 2 to point 1, and from point 1 to the next point, forming a cylindrical coil 12 as shown in FIG. 4 to form the rotor. Here, the winding method in which the upper and lower folded portions 2 of the winding 1 are properly aligned on the same circumference as shown in FIG. 4 is called aligned winding, and as shown in FIG. The stacking pitch d' of the winding 1 in the winding is the wire diameter of the winding 1, d,
If the inclination angle of the winding 1 with respect to the axial direction of the rotor is θ, then d/cos θ is obtained.

By the way, as a method for increasing the number of turns of the winding 1 compared to the above-mentioned aligned winding, when the winding 1 is wound once, the stacking pitch of the folded portion 2 of the winding 1 can be changed to the stacking pitch d'( =d/cos
One possible method is to wind it smaller than θ).
A rotor wound in this manner is shown in FIG. 7, and this winding method is hereinafter referred to as lap winding. In order to improve the electrical connection with the commutator piece 5 during this overlapping winding, a coil tap 8 is provided in which a part of the folded portion 2 is formed into a loop shape. FIG. 1 shows a cross-sectional view of a coreless motor constructed using a rotor with coil taps 8 as described above.
A commutator support 3 having a rotor (indicated by R in the figure) attached to its outer periphery is rotatably supported by a rotating shaft 4, and a pair of commutator pieces 5 are provided on the commutator support 3. A brush 6 is arranged in sliding contact. A permanent magnet 7 is fixedly provided inside the rotor R, and the rotor R is rotated by the magnetic field generated by the permanent magnet 7 and the current flowing through the winding 1.

At a certain rotational position of the rotor R, the magnetic field is
Magnetic flux in the same direction passes through the winding 1 from point A to point B shown in the figure, and magnetic flux in the opposite direction passes through the winding 1 from point B to point A to the right. The coil tap 8 is bent inward and placed in contact with the upper surface of the commutator piece 5, and the two are connected by solder. However, the above coil tap 8
The rotor of this type has the following disadvantages. In other words, when winding the winding into a perfectly circular cylinder, it is necessary to provide this coil tap, resulting in poor workability. When connecting the commutator piece and the coil tap, it is necessary to bend the coil tap inward. Because the wire is bent inward, a portion of the winding may lift up near the coil tap.
The drawback was that the rotor would become out of round. Incidentally, even in the case of a rhombic-wound rotor as shown in FIGS. 8 and 9, similar drawbacks occurred in those provided with coil taps.

The present invention was invented with attention paid to the above points, and one embodiment thereof is shown in FIGS. 10 and 11. In the figure, reference numeral 1 denotes a winding wire whose outer periphery is coated with insulation, and is formed into a cylindrical shape by the above-described overlapping winding. The folded portion 2a of the winding 1, which corresponds to the portion connected to the commutator piece 5, has its insulation coating peeled off to form a current-carrying portion 9 as shown by diagonal lines in FIG. As shown in FIG. 12, the current-carrying portion 9 is provided so as to be exposed to the outside at the inner and outer peripheral portions of the upper end of the rotor R, and an inverted U-shaped connection conductor 11 is fitted into the current-carrying portion 9. The connecting conductor 11 and the commutator piece 5 are connected by solder 10. The commutator piece 5 is placed on an insulating commutator support 3 fixed to the upper inner side of the winding 1. FIG. 13 shows another embodiment, in which the commutator pieces 5 are arranged around the rotating shaft 4 in a cylindrical shape.

As described above, the present invention allows the winding to pass diagonally through one pole of the magnetic field and is folded back diagonally at the transition from one pole to the next pole of the magnetic field, so that the folded part of the upper winding is positioned on the circumference. In a coreless motor rotor that is constructed by sequentially stacking windings in a cylindrical shape, the stacking pitch of the folded portions of the windings is made smaller than the stacking pitch of the folded portions when the folded portions are arranged on the same circumference. Among the folded parts, the insulation coating of the folded part connected to the commutator piece is peeled off to form a current-carrying part, and this current-carrying part and the commutator piece are electrically connected. When connecting the folded part of the winding, it is sufficient to simply connect the commutator piece to the folded part from which the insulation coating has been removed by soldering, etc., and there is no need to make the prescribed folded part into a loop-shaped coil tap. This makes it easier to manufacture the rotor and improves work efficiency. It also has the effect of preventing deformation of the windings when connecting the commutator pieces and sufficiently maintaining the roundness of the rotor. Moreover, since the stacking pitch of the folded portion of the windings is smaller than the stacking pitch of the aligned rotor, the number of turns of the windings can be increased, making it possible to create a coreless motor with high rotational torque. In cases where the number of turns of the wire is increased by overlapping winding, there is no need to pull out the tap, so there is no disturbance of the winding at the pull-out part of the tap, and there is no problem such as rare short or wire breakage. It also has the effect of preventing deformation of the windings and sufficiently maintaining the roundness of the rotor, making it possible to efficiently rotate the rotor at high speed with a large rotational torque. .

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional coreless motor, Figure 2 is a cross-sectional view of a conventional coreless motor.
The figure is a perspective view of a commutator support used in the same as above, Figure 3 is a basic pattern diagram of the winding of the rotor in the same as above, Figure 4 is a partially omitted perspective view of a rotor with aligned winding, and Figure 5 is a perspective view of a rotor with aligned winding.
The figure is an explanatory diagram of how to wind the same winding wire as above, and Figure 6 is an illustration of how to wind the winding wire.
7 is a partially omitted perspective view of the rotor with overlapping winding, FIG. 8 is a developed view of the rotor with diamond-shaped winding, FIG. 9 is a partially omitted perspective view of the same as above, and FIG. 10 is a partially omitted perspective view of the rotor with overlapping winding. FIG. 11 is a partially omitted perspective view of an embodiment of the present invention, FIG. 11 is an assembled perspective view of the same, FIG. 12 is a sectional view of the rotor in the same, and FIG. 13 is a sectional view of another rotor. 1 is a winding, 2 and 2a are folded parts, 5 is a commutator, and 9 is a current-carrying part.

Claims (1)

[Claims] 1. Pass the winding diagonally through one pole of the magnetic field, and fold it back diagonally at the part where it transitions from one pole of the magnetic field to the next pole, so that the winding is sequentially shaped into a cylindrical shape so that the folded part of the winding is located on the circumference. In a coreless motor rotor configured by stacking, the stacking pitch of the folded portions of the windings is made smaller than the stacking pitch of the folded portions when the folded portions are arranged on the same circumference, and the rectification of the folded portions is 1. A rotor for a coreless motor, characterized in that a current-carrying part is formed by peeling off an insulating coating of a folded part connected to a child piece, and the current-carrying part and the commutator piece are electrically connected.