JPS5924624B2 - Coreless motor rotor - 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, so that the folded portion 2 of the winding 1 is In a rotor of a coreless motor which is constructed by stacking one after another in a cylindrical shape so as to be aligned on the same day, a folded part 2 connected to a commutator piece 5 among the folded parts 2 arranged in an aligned manner.
The terminal portion 9 is formed by peeling off the insulating coating of a, and the stacking pitch of the folded portions 2 between the terminal portions 9 is smaller than the stacking pitch of the folded portions 2a constituting the terminal portion 9. The purpose of the present invention is to provide a rotor for a coreless motor that is easy to manufacture.

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 4, then turned back diagonally at point 4, wound diagonally again to point -, then turned back diagonally at point . Wind it diagonally up to two points, and then sequentially wind it from two points to point H, and from point H to the next point, and as shown in Fig. 4, the single cylindrical coil 12
The rotor was configured as follows.

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 the winding 1 is stacked in this aligned winding. The pitch d' is a series of - and COS θ, where d is the wire diameter of the winding 1 and θ is the inclination angle of the winding 1 with respect to the axial direction of the rotor.

By the way, as a method of increasing the number of turns of the winding 1 for the above-mentioned aligned winding, when the winding 1 is wound once, the stacking pitch of the folded portion 2 of the winding 1 is changed to the stacking pitch in the case of aligned winding (- One possible method is to wind it smaller than the coa19).

The rotor wound in this way is the rotor shown in Fig. 7,
This method of winding is hereinafter referred to as lap winding.

In order to improve electrical coupling with the commutator piece 5 in this overlapping winding, a coil tap 8 is provided in which a part of the folded portion 2 is formed into a loop shape.

Figure 1 shows a cross-sectional view of a coreless motor constructed using a rotor from which coil taps 8 as described above are derived, and in which a commutator support is added with an outer peripheral rotor (indicated by R in the figure). 3 is rotatably supported by a rotating shaft 4, and a pair of brushes 6 are disposed in close contact with a commutator piece 5 disposed on the commutator support base 3.

A permanent magnet I 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 such that magnetic flux in the same direction passes through the winding 1 from point A to four points shown in Figure 5, and magnetic flux in the opposite direction passes through the winding 1 from the fourth point to point A to the right. It is designed to penetrate.

The coil tap 8 is bent inward and the commutator piece 5
They are placed in contact with the top surface, and the two are connected by solder.

However, the rotor provided with the coil tap 8 has the following drawbacks.

1) When winding the winding into a perfectly circular cylindrical shape, this coil tap must be provided, which makes workability difficult. 2) When connecting the commutator piece to the coil tap, the coil tap must be bent inward. 3) Since the coil tap is bent inward, a part of the winding is lifted up in the vicinity of the coil tap, causing the rotor to become out of roundness.

Incidentally, even in the case of a diamond-shaped rotor as shown in FIGS. 8 and 9, the rotor provided with coil taps had the same drawback.

The present invention was invented with attention paid to the above points, and one embodiment thereof is shown in FIGS. 10 to 12.

In the figure, numeral 1 denotes a winding whose outer periphery is coated with insulation and is wound around a cylindrical coil 12.

Several turns of the folded portion 2a of the portion of the wire 1 connected to the commutator piece 5 are wound in an aligned manner to form an aligned wound portion 13, and a predetermined folded portion 2a of the aligned wound portion 13 is insulated. The coating is peeled off to form the terminal portion 9 as shown by diagonal lines in FIG. 10a.

The folded portion 2 between the aligned winding portions 13 is multi-wound by overlapping winding with a smaller stacking pitch than the aligned winding, and the number of turns is larger than that of the terminal portion 9 portion.

As shown in FIG. 12, the terminal 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 connecting conductor 11 is fitted into this terminal portion 9. The connecting conductor 11 and the commutator piece 5 are connected by solder 10.

The commutator piece 5 is fixed to the inner upper part of the cylindrical coil 12 and placed on an insulating commutator support 3.
The figure shows another embodiment, in which the commutator pieces 5 are arranged in a cylindrical shape around the rotating shaft 4.

In the present invention, the terminal portion is formed by peeling off the insulation coating of the folded portion connected to the commutator piece among the folded portions arranged in alignment as described above, so that the folded portion of the commutator piece and the winding When connecting a coil, it is possible to simply connect a commutator piece with solder, etc. to the folded part from which the insulation coating has been peeled off, and there is no need to make a loop-shaped coil tag in the prescribed folded part, which makes rotor manufacturing easier. This simplifies the process, improves work efficiency, prevents deformation of the windings when connecting the commutator pieces, and maintains the roundness of the rotor.

Moreover, since the folded portions that have been placed at the same angle are peeled off, the peeling work is simplified and the work efficiency is improved. Since the pitch is smaller than the stacking pitch of the folded parts constituting the folded part, the number of turns of the winding can be increased, which has the effect of making it possible to obtain a coreless motor with a large rotational torque.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional coreless motor, Fig. 2 is a perspective view of a commutator support used in the above motor, Fig. 3 is a basic pattern of the rotor winding shown above, and Fig. 4 is a diagram showing the winding pattern of the rotor with aligned winding. A partially omitted perspective view of the rotor, Fig. 5 is an explanatory diagram of how to wind the same winding as above, Fig. 6 is a partially enlarged view of Fig. 5, and Fig. 7 is a partially omitted perspective view of the rotor with overlapping winding. , FIG. 8 is a developed view of a rotor with rhombic winding, FIG. 9 is a partially omitted perspective view of the same as above, and FIG. 10a is a partially omitted perspective view of an embodiment of the present invention; 11 is an assembled perspective view of the same as above, FIG. 12 is a sectional view of the coreless rotor in the above, and FIG. 13 is a sectional view of another coreless rotor. 1 is a winding, 2 and 2a are folded parts, 5 is a commutator piece, 9
is the terminal part.

Claims (1)

[Claims] 1. Pass the winding diagonally through one pole of the magnetic field, and fold it back diagonally at the transition from one pole of the magnetic field to the next pole, so that the folded part of the winding is aligned on the same circumference. In a rotor of a coreless motor that is stacked in a stacked manner, terminal parts are formed by peeling off the insulation coating of the folded parts connected to the commutator pieces among the aligned folded parts, and the folded parts between the terminal parts are peeled off. A rotor for a coreless motor, characterized in that the stacking pitch of the folded portions is smaller than the stacking pitch of the folded portions constituting the terminal portions.