JPS58141661A - Rotor for coreless motor - Google Patents

Abstract

PURPOSE:To prevent the crack of a commutator by securing the second cylinder provided with a plurality of commutator segments on the outer periphery through the first cylinder which is press-fitted to a rotational shaft to the shaft. CONSTITUTION:The first cylinder 8 is press-fitted to a rotational shaft 7, the second cylinder 10 is then movably engaged with the shaft 7, and a commutator terminal 13 is soldered to a cylindrical coil 14 and the electrode 17 of a varistor 16. A plurality of commutator segments 12 are provided on the outer periphery of the second cylinder 10, and secured to the shaft 7 through the first cylinder 8 which is formed of metal material which is hardly cracked. In this manner, the crack of the commutator can be prevented when the commutator is press- fitted to the shaft, thereby rigidly securing it to the shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotor for a coreless motor using a cylindrical commutator.

Generally, the rotating shaft is press-fitted into a shaft hole formed in the center of the cylindrical commutator of a motor, but arc resistance or soldering between the commutator terminal and the coil improves heat resistance during connection. For example, the cylindrical body is made of a thermosetting resin such as dialle 7 tallate resin, and commutator grooves are bored between the commutator pieces arranged on the outer periphery of the cylindrical body. There was a gap where it was easy to break.

In addition, in the rotor of a coreless motor, the cylindrical fill and commutator terminal are connected by soldering, but the connection between the rotating shaft and the cylindrical coil is not sufficient, and when the rotor rotates at high speed, the cylindrical fill and commutator terminal are connected. While the section was off - there was a point.

The present invention has been made in consideration of the above-mentioned problems, and its purpose is to prevent cracking of the commutator and to firmly fix the cylindrical coil to the rotating shaft of a coreless motor.
-It is to provide evening meals.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 8 of the drawings. 1 is a cylindrical motor case with a bottom, and a brush stand 2 is fitted into the opening at one end, and a magnet support stand 8 is attached to the bottom wall.
has been established. A shaft insertion hole 4 is formed in the center of the magnet support 8, and a cylindrical magnet 5 is formed on the outer periphery of the support 8.
A pair of bearings 6 are fitted at both ends of the shaft insertion hole 4.
. It is fitted. The cylindrical commutator 9 includes a second cylindrical body 10 made of a thermosetting resin with excellent heat resistance, such as diallerol resin, and a second cylindrical body made of a metal material such as brass. a first cylindrical body 8 having a larger diameter than the body IO; a plurality of commutator pieces 12 arranged at equal intervals on the outer periphery of the second cylindrical body 10 and in sliding contact with the brushes 11 provided on the brush stand 2;
A commutator terminal 18 extends in an L-shape from the commutator piece 12.
A second shaft hole 21 larger than the diameter of the rotating shaft 7 is formed in the center of the second cylindrical body 10, and a second shaft hole 21 that is concentric with the second shaft hole 21 is formed in the first cylindrical body 8. (b) A first shaft hole 22 is formed in a shaft shape and has approximately the same diameter as the rotating shaft 7, and the rotary shaft 7 is loosely fitted into the second shaft hole 21, and the first shaft hole 22 is It is press-fitted into place. Further, an adhesive 18 is poured between the outer circumferential surface of the first cylindrical body 8 and the inner circumferential surface of the cylindrical coil 14 to adhesively fix the two, and the cylindrical fill 14 is placed between the motor case l and the magnet 6. The cylindrical coil 14 is electrically connected to the commutator terminal 18 by soldering. Further, a step 15 is formed on the upper surface of the first cylindrical body 8, and a ring-shaped varistor element 16 for noise prevention is interposed between the step 15 and the commutator terminal 18. Varistor element 16 electrode 17
is connected to the commutator terminal 18 by soldering.

Therefore, when assembling, first attach the first cylindrical body 8 to the rotating shaft 7.
The rotary shaft 7 and the cylindrical fill 14 are held concentrically by a jig (not shown), the ring-shaped varistor element 16 is attached, and the adhesive 18 is poured in. In this state, the cylindrical fill 14 is dried. and connect the connecting terminal 18 to the cylindrical fill 14.
and the electrode 17 of the varistor element 16 are connected by soldering to the second cylindrical body 1 made of a thermosetting resin that is easily broken.
0, the first cylindrical body 8 made of a metal material that is hard to break is press-fitted and fixed to the rotating shaft 7 without being directly press-fitted onto the rotating shaft 7, and the second cylindrical body 10 is rotated through the first cylindrical body 8. The cylindrical coil 14 is firmly fixed to the rotating shaft 7 by fixing it to the shaft 7 to prevent deformation, and by fixing the cylindrical fill 14 to the outer periphery of the first cylindrical body 8. be. Furthermore, in order to further increase the fixing strength of the cylindrical coil 14, the length in the axial direction of the cylindrical body 8 of 1 lil may be increased.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and may be one in which the varistor element is not included as shown in Figs. 4 and 6. In this embodiment, the first cylindrical body 8 made of a metal material The upper surface and the lower surface of the second cylindrical body 10 made of thermosetting resin are fixed with an adhesive 18, and the locking protrusion 19 formed on the lower surface of the second cylindrical body 10 and the first cylindrical body A locking recess 20 formed on the upper surface of the rotor 8 is fitted to ensure rotational fixation. Further, in the commutator 9 of the present invention, the first cylindrical body 8 and the second cylindrical body 10 may be integrally formed of thermosetting resin as shown in FIG.

As described above, the rotor of the coreless motor of the present invention includes a co-rotating shaft, a first cylindrical body that is press-fitted and fixed to the rotary shaft, and a shaft that is concentric with the rotary shaft and has one end fixed to the outer periphery of the first cylindrical body. a second cylindrical body made of an insulating material that is integrally formed with the first cylindrical body, protrudes toward the opposite side of the cylindrical coil, and loosely fits with the rotating shaft; and the second cylindrical body. and a commutator terminal for electrically connecting the commutator pieces and the cylindrical fill,
When press-fitting and fixing the commutator to the rotating shaft, the commutator can be firmly fixed to the rotating shaft without cracking as in conventional examples.Moreover, the first cylindrical body also serves as a fixing means for the cylindrical coil, so that it can be firmly fixed to the rotating shaft. This has the effect that the cylindrical coil can be securely fixed and the electrical connection with the commutator terminal will not come off.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional front view of a coreless motor using a rotor according to an embodiment of the present invention, FIG. 2 is a cross-sectional front view of the same rotor,
8 is a top view of the same as above, FIG. 4 is a sectional front view showing a new embodiment, FIG. 5 is an exploded perspective view of the same, and FIG. 6 is a sectional front view showing another embodiment. 7. Fist co-rotating axis, 80 first cylindrical body, 9. Commutator, lO
...Second cylindrical body, 12.. Commutator piece, 18.. Commutator terminal, 14.. Cylindrical fill, 16.. Varistor element, 1
7... Electrode 0 Patent applicant Matsushita Electric Works Co., Ltd. Patent attorney Toshimaru Takemoto (2 people) Figure 1 -287- Spear 4 Figure A25 Figure 6 Figure 21

Claims (1)

[Scope of Claims] l) A rotating shaft, a first cylindrical body that is press-fitted and fixed to the rotating shaft, and a cylindrical coil that has one end fixed to the outer periphery of the first cylindrical body and that is concentric with the rotating shaft. a second cylindrical body made of an insulating material that is integrally formed with the first cylindrical body, protrudes on the opposite side from the cylindrical coil, and fits loosely with the rotating shaft; and a second cylindrical body formed on the outer periphery of the second cylindrical body A rotor for a coreless motor, comprising: a plurality of commutator pieces; and a commutator terminal for electrically connecting the commutator pieces and the cylindrical fill. 2), the first cylindrical body is formed of a metal material, and the second cylindrical body is formed of a metal material;
2. The coreless motor according to claim 1, wherein the cylindrical body is made of thermosetting resin. 8) A ring-shaped varistor element is interposed between the commutator terminal and the end surface of the first cylindrical body facing the commutator terminal, and the commutator terminal and the electrode of the varistor element are electrically connected. A rotor for a coreless motor according to claim 1. 4) A rotor for a coreless motor according to claim 1, wherein the first and second cylindrical bodies are integrally formed of an electrically insulating material.