JPH0465629B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has a coreless structure with 2n (n
The present invention relates to a disk-type semiconductor motor having a rotor having a field magnet having poles (an integer of 2 or more).

This type of disk-type semiconductor motor has a coreless structure, so there is no cogging, making it extremely advantageous for smooth and high-speed rotation.

Therefore, there has been an increasing demand to be able to rotate this type of disk-type semiconductor at a higher speed by making only slight improvements to the motor.

Therefore, the problem of this invention was to make it possible to rotate at a higher speed with only slight improvements, and also to solve the problem of the coreless armature on the fixed side that occurs when rotating at high speed. The purpose is to prevent burnout.

The problem of the present invention is to provide a non-magnetic material on the fixed-side coreless armature surface to form a flat surface, and to alternately arrange N-pole and S-pole magnetic poles facing the non-magnetic material made of the flat surface. This is made possible by forming spiral radial grooves on the rotor surface having field magnets with 2n (n is an integer of 2 or more) poles.

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

FIG. 1 is a longitudinal sectional view of a disk type semiconductor fan motor 1 as an embodiment of the present invention. Referring to FIGS. 1 to 3, reference numeral 2 denotes a disk-type semiconductor fan motor case 2, 2a formed of plastic as shown in FIG.
is a concave part of the case 2, 4 is an air vent provided at the bottom of the case, 5 is a branch, 6-1, 6-
2 is a positive power cord and a negative power cord, 7 is a cup body fixed to the case 2,
Reference numeral 8 indicates a bearing support cylinder integrally formed approximately at the center of the bottom portion 2a, reference numerals 9 and 10 indicate bearing bearings provided at both upper and lower ends of the cylinder 8, and reference numeral 11 indicates bearings 9 and 1.
0 rotatably supported by a rotary shaft, 12 a boss fixed to the upper end of the rotary shaft 11, 13 a cup with a fan fixed to the boss 12 (see Fig. 3), 14 is a fan integrally formed on the outer periphery of the cup body 13; 15 is a rotor yoke made of an annular magnetic material fixed to the inner surface of the cup body 13 with fan; 16 is an N fixed to the inner surface of the rotor yoke 15. , a four-pole field magnet having alternating magnetic poles of S; 17 is an annular stator yoke fixed on the upper surface of the bottom portion 2a; 18 is a Hall element, a Hall IC;
19 is a printed circuit board made of an annular non-magnetic material, on which the position sensing element 18 is mounted by soldering. , 20 a magnetic attraction piece made of an iron piece or a magnet formed protruding from the printed circuit board 19; 21 an armature coil forming a fixed-side coreless armature; 22 a printed circuit board fixedly mounted on the upper surface of the group of armature coils 21; This is a fixed-side coreless armature protective non-magnetic disc made of thin aluminum plate.

Referring to FIG. 4, the fixed side coreless armature has two armature coils 21-1,
21-2 is arranged to form an armature of a single-phase motor. Reference numerals 23 and 24 denote electric circuit components for driving the motor, which are rationally arranged in the remaining space of the printed circuit board 19 where the armature coils 21-1 and 21-2 are not arranged. Armature coil 21-
1 and 21-2 have a fan frame shape in which the opening angle of the radial conductor portions 21a and 21a' contributing to the generated torque is approximately equal to the width of one magnetic pole of the field magnet 16. . Armature coil 21-1, 2
The circumferential directions 21b and 21b' of 1-2 are portions that do not contribute to the generated torque. The position detection element 18 is a conductor portion 2 that contributes to the torque generated by the armature coil 21-2.
It is arranged on the lower surface of the printed circuit board 19 facing 1a. In addition, it may be arranged at the position of the dotted line enclosure 25 which is 180 degrees symmetrical to the element 18. The magnetic protrusion 20 is arranged at a position 180 degrees symmetrical to the armature coil 21-1 conductor portion 21a'. In addition, the armature coil 21-1,
21-2 may be arranged 180 degrees symmetrically, and the positions of the elements 18 and protrusions 20 are not limited to those in the example shown in FIG.

Referring to FIGS. 5, 6, and 1, spiral radial grooves 26, such as those seen in group bearings, are formed on the surface of the field magnet 16 that faces the nonmagnetic disc 22.
is formed.

In the above example, one position detection element 18 and two armature coils 21 are used, but this is to obtain an inexpensive and small single-phase disk type semiconductor fan motor 1. be. When two armature coils 21 are used, the position sensing element 18
If only one element is used, if the element 18 detects a dead point (the boundary between the N and S poles of the field magnet 16), it will not be able to start automatically. Therefore, when two armature coils 21 are used, two position detection elements 18 are required. However, since the position sensing element 18 is expensive, in order to form the disk type semiconductor fan motor 1 at low cost, it is desirable to use only one position sensing element 18. Therefore, in the present invention, a magnetic protrusion 20 for attraction is provided. In addition, this protrusion 20
It goes without saying that it may be formed integrally with the stator yoke 17. That is, if the protruding piece 20 is provided at an appropriate position, even if the position detection element 18 detects the dead point, the field magnet 1 with strong magnetic flux of N pole and S pole other than the dead point
6 is attracted by the attracting magnetic protrusion 20 and the field magnet 16 rotates, so that the position detection element 18 does not face the dead point but faces the field magnet 16 where the N and S magnetic fluxes are strong. Therefore, even one position detection element 18 can be activated automatically. The non-magnetic disk 22 was provided because
Not only to protect the stator armature;
The desired effect of the present invention is to slightly lift the rotor to reduce the load on the rotor, reduce harsh and loud rotational noise caused by high-speed rotation, and reduce negative effects on the bearings 9 and 10. This is to obtain a disk-type semiconductor fan motor 1 that rotates smoothly at high speed and has good rotational efficiency.

Since the disk type semiconductor fan motor of the present invention has the above configuration, when the rotor rotates, the fan 14
As the rotor (field magnet 16) rotates, air is guided into the through hole 4, between the field magnet 16 surface and the non-magnetic disk 22 surface, and into the radial groove 26. The rotor is lifted by the air that has entered between the field magnet 16 and the non-magnetic disc 22, and rotates smoothly, resulting in good rotational efficiency and a long service life without putting any strain on the bearings. The effect is that even when rotating at high speed, it does not produce the loud and harsh rotational noise that conventional methods produce.

Also, since the rotor rotates with a slight lift,
It is possible to create a device that can rotate at high speeds, and with only slight improvements, it is extremely easy and inexpensive to create a device that can rotate at higher speeds.In addition, air can efficiently enter and circulate in the small gap between the stationary side and the rotating side. Therefore, it is possible to prevent burnout of the stationary side coreless armature that occurs when rotating at high speed.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a disk-type semiconductor fan motor as an embodiment of the present invention, FIG. 2 is a perspective view of a square disk-type semiconductor fan motor, and FIG. 3 is a perspective view of a cup with a fan. 4 is a plan view of the stator armature, FIG. 5 is a bottom view of a field magnet as an embodiment of the present invention, and FIG. 6 is a perspective view of the field magnet shown in FIG. 1... Disk type semiconductor fan motor, 2...
Disc type semiconductor fan motor case, 2a...
Bottom, 3... Recess, 4... Air vent, 5... Branch, 6-1... Positive power cord, 6-2... Negative power cord, 7... Cup body, 8... Bearing support cylinder , 9, 10... bearing bearing, 11...
... Rotating shaft, 12 ... Boss, 13 ... Cup body with fan, 14 ... Fan, 15 ... Rotor yoke,
16... Field magnet, 17... Stator yoke, 18... Position detection element, 19... Printed circuit board, 20... Magnetic protrusion for attraction, 21... Armature coil, 22... Stator armature protection protector. magnetic disk,
23, 24... Electric circuit components for motor drive, 25
...Dotted line enclosure, 26...Spiral radial groove.

Claims (1)

[Claims] 1 A non-magnetic material is provided on the fixed-side coreless armature surface to form a flat surface, and N and S magnetic poles facing the non-magnetic material made of the flat surface are alternately 2n (n is 2).
1. A disk-type semiconductor motor characterized in that a spiral radial groove is formed on a rotor surface having a field magnet having a field magnet having an integer of poles or more.