JPS5814690Y2 - coreless motor - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a coreless motor having a cup-shaped rotor.

A conventional coreless motor having a cup-shaped rotor has bent protrusions a and a at the end portions, as shown in FIGS. 1 to 3.
A plurality of coils A (see Fig. 2) are arranged to form a cylinder (see Fig. 3) on the outer periphery of the substrate B, which has a commutator on the upper surface, and are fixed and integrated with resin. A cup-shaped rotor D having protrusions d and d is formed on the outer cylindrical body at both ends in the axial direction by arranging the shaft C, and the shaft C is inserted into the center insertion hole e of the cylindrical fixed magnet E. A cover body 'L having a brush L is fitted and rotatably disposed in a space G formed between the inner wall of the cylindrical magnetic case F and the outer peripheral body of the cylindrical fixed magnet E, and The structure is such that the brush l is attached to the open end of the cylindrical magnetic case F in contact with the commutator, and the shaft C is supported between the lid and the cylindrical magnetic case F, so that the cup-shaped rotor The protrusion of the protrusions d and d at both ends increases the distance between the cylindrical fixed magnet E and the cylindrical magnetic case F, resulting in a disadvantage that the efficiency of the motor decreases.

In view of this, the present invention, as shown in FIGS. 4 and 5, connects chive-split magnetic materials H and H to the recess J formed by the protrusions d and d at both ends of the cup-shaped rotor D. , h correspond to the N and S poles of the cylindrical fixed magnet E and are arranged so as to form a gap K, and the magnetic bodies H and H are fixedly disposed on the inner wall of the cylindrical magnetic body case F. .

The same reference numerals in the drawings indicate the same or equivalent parts.

As described above, in the present invention, a chimney-shaped magnetic material is fixed to the inner wall of the cylindrical magnetic material case, and the magnetic material is placed in the recess between the protrusions protruding from both ends of the outer cylindrical body of the cup-shaped rotor. The air gap between the fixed magnet and the magnetic case can be reduced without causing any trouble to the rotation of the cup-shaped rotor, and it is easy to accommodate changes in specifications due to changes in coil wire diameter, etc. by simply replacing the magnetic material in the chive split. It has the effect of easily improving the efficiency of the motor.

[Brief explanation of drawings]

Figures 1 to 3 show a conventional example, where Figure 1 is an overall sectional view, Figure 2 is a perspective view of the coil, Figure 3 is a perspective view of the cup-shaped rotor when assembled, and Figure 4. 5 is a cross-sectional view of the entire embodiment of the present invention, and FIG. 5 is a cross-sectional view taken along the line X--X of the same. Explanation of symbols for main parts: A is a coil, B is a substrate, C is a shaft, D is a cup-shaped rotor, d is a protrusion, J is a recess, E is a cylindrical fixed magnet, F is a cylindrical magnetic case, G is a In the space, H is a magnetic material, K is a gap, and L is a lid.

Claims (1)

[Scope of utility model registration request] A cylindrical fixed magnet is housed and fixed by forming a space between the cylindrical magnetic case and the inner circumferential body, and a cup-shaped rotor having protrusions at both ends of the axial outer circumference is formed between the cylindrical magnetic case and the space between the cylindrical magnetic case and the cylindrical fixed magnet. The cup-shaped rotor is rotatably disposed in the section, and the two halves of the magnetic body are placed in the recesses formed by the same protrusions of the cup-shaped rotor. A coreless motor that is fixed to the inner wall of a cylindrical magnetic case and arranged to form a gap with the rotor.