KR19990065555A - Rotor structure of brushless motor - Google Patents

Abstract

The present invention relates to a rotor structure of a brushless motor, and to simplify the manufacturing process by changing the structure, to reduce the production cost to increase the productivity as well as to increase the productivity of the brushless motor when the gap between the stator and the brushless motor By minimizing it, it also contributes to the improvement of efficiency.

To this end, the present invention is in contact with the rotating shaft 201, the rotor core 202 having a predetermined thickness and overlapped with each other and the N, S stimulus arrangement on the outer peripheral surface of the rotor core in sequence Four permanent magnets 203 having outer ends rounded at both ends and molding rings formed in contact with both sides of the rotor core 202 to hold both ends of the permanent magnets 203. And, it is formed by forming a plurality of fixing rods 205 to hold between the four permanent magnets 203 and the holding ring 204 to be filled between each of the permanent magnets (203).

Description

Rotor structure of brushless motor

TECHNICAL FIELD The present invention relates to the field of brushless motors and, more particularly, to a rotor that actually generates power while rotating by a magnetic force generated in a stator.

In general, a brushless motor is a motor capable of variable speed control, and is mainly used to rotate a specific rotating body at a high speed and a low speed as needed, and is commonly used to rotate a washing tub of a washing machine.

The brushless motor includes a stator 1 that receives a large current to generate a magnetic force, a rotor 2 rotatably installed inside the stator to rotate by a magnetic force generated by the stator 1, and the stator. It is largely comprised by the rotor position detection means which detects the position of the rotor accurately so that the electric current supplied to (1) flows in accordance with the magnetic pole of the rotor 2.

In the stator (1) and the stator housing 11, having a predetermined thickness and overlapping each other and the stator core 12 is fixed to the inside of the stator housing 11, the stator core is wound around the power supplied to the magnetic force It consists of the stator coil 13 which generate | occur | produces.

In addition, the rotor 2 includes a rotating shaft 21 supported by the bearing 3 on both sides of the stator housing 11 of the stator 1, and a rotor core 22 overlapping each other with a predetermined thickness and fixed to the rotating shaft 22. ) And four permanent magnets 23 which are in contact with the outer circumferential surface of the rotor core and have an N and S stimulus array in sequence, and the permanent magnet 23 while surrounding the outer circumferential surface of the permanent magnet. It consists of the cylindrical can 24 which makes the contact | attachment to the rotor core 22. As shown in FIG.

And the rotor position detecting means is fixed to one side of the rotating shaft 21 constituting the rotor 2, the sensing magnet 4 having the same magnetic pole arrangement as the permanent magnet 23, and the stator constituting the stator 1 Three Hall sensors that are fixed to one side of the housing 11 and the sensor bracket (5) attached to the sensor bracket at intervals of 60 ° to sense the magnetic pole array of the sensing magnet 4 while generating a sensing signal by receiving power It consists of (6).

Therefore, when the power is supplied, the supplied power enters the three Hall sensors 6 attached to the sensor bracket 5 of the rotor position detecting means at 60 ° intervals, so that each Hall sensor generates a sensing signal. In this case, considering that the sensing magnet 4 having the same magnetic pole array as the permanent magnet 23 of the rotor 2 is fixed to one side of the rotating shaft 21 constituting the rotor 2 The sensing signal generated by the hall sensor 6 is transmitted to the sensing magnet 4 to sense the magnetic pole of the sensing magnet, so that the controller accurately detects the position of the rotor 2 according to the sensing value.

In this way, when the position of the rotor 2 is accurately detected by the controller, the controller configures the stator coils constituting the stator 1 to match the N and S stimulus arrays of the permanent magnets 23 constituting the rotor 2. As the power is supplied to (13) in a specific direction, the magnetic force of the polarity corresponding to the current flow direction of the stator coil 13 is generated in the stator coil, and the permanent magnet 23 constituting the magnetic force and the rotor 2. Since an induction current is generated between the stator 1 and the rotor 2 by the magnetic pole of the rotor, as the rotary shaft 21 of the rotor is rotated under the rolling motion of the bearing 3, the rotor 2 eventually becomes Is rotated continuously.

Referring to the process of manufacturing a conventional rotor of the brushless motor as described above by reference, the center of the rotor core (22) having a predetermined thickness and overlapping each other is inserted into the rotating shaft (21) Next, four permanent magnets 23 are brought into contact with the outer peripheral surface of the rotor core 22 such that N and S are sequentially arranged.

Subsequently, the four permanent magnets 23 are integrally wrapped as a non-magnetic metal plate, which is a material of the can 24, and then both ends of the metal plate are integrated with each other by welding to form a can 24 having a perfect shape. The permanent magnet 23 is in close contact with the rotor core 22, the assembly of the rotor is completed.

In the state where the conventional rotor is assembled, the four permanent magnets 23 are surrounded by the can 24 on the outer circumferential surface, which is in close contact with the rotor core 22 by rotating the permanent magnets 23. This is to prevent each permanent magnet 23 from being separated by centrifugal force even when the rotor 2 rotates when using a brushless motor having electrons.

When the rotor 2 assembled in this way is installed inside the stator 1, both sides of the rotating shaft 21 constituting the rotor 2 are mounted on the stator housing 11 constituting the stator 1, and the bearing 3 ) Is supported.

However, the conventional rotor has four permanent magnets in close contact with the rotor core and uses a can to prevent the permanent magnet from being detached when the rotor rotates. drawing) work, as well as the inconvenience of welding both ends after the deep draw operation, there is a problem in that the productivity is reduced and the production cost increases as the overall workability is reduced.

In addition, as described above, since the cap made of a non-magnetic metal plate surrounds the permanent magnet, when the rotor is applied to the brushless motor, the actual distance between the stator and the permanent magnet constituting the rotor can be widened. Therefore, when the brushless motor is operated, induction current between the rotor and the stator is not smooth and there is a problem that the efficiency is lowered.

The present invention has been made in order to solve the above-mentioned conventional problems, and in accordance with the use of the structure to keep the permanent magnet firmly in close contact with the rotor core so that the permanent magnet is not separated when the rotor rotates in the overall manufacturing The purpose is to reduce the production cost as well as to increase productivity as the workability is improved.

In addition, the permanent magnet of the rotor is exposed to the outside, so that the gap between the permanent magnet and the stator is minimized when applied to a brushless motor, thereby facilitating generation of induced current between the rotor and the stator and contributing to the improvement of efficiency. Its purpose is to.

According to the present invention for achieving the above object, it has a rotation axis, a rotor core overlapping each other with a predetermined thickness and pressed into the rotation shaft, and the N, S stimulus arrangement on the outer peripheral surface of the rotor core in sequence Four permanent magnets contacted and rounded at both ends of the outer end, molded in contact with both sides of the rotor core are formed in the holding ring for holding both ends of the permanent magnet, and filled between the four permanent magnets A rotor structure of a brushless motor is provided, which is formed with a plurality of fixing rings and is composed of a plurality of fixing units for holding the outside of each permanent magnet.

1 is a longitudinal sectional view showing main parts of a conventional brushless motor having a rotor;

Figure 2 is a longitudinal cross-sectional view showing a conventional rotor

3 is a cross-sectional view taken along the line A-A of FIG.

4 is a perspective view showing a part of a conventional rotor

5 is a longitudinal sectional view showing main parts of a brushless motor having a rotor according to the present invention;

6 is a longitudinal sectional view showing the rotor of the present invention;

7 is a cross-sectional view taken along the line B-B of FIG.

8 is a perspective view showing a part of the rotor of the present invention;

Explanation of symbols for main parts of the drawings

201.Rotary shaft 202. Rotor core

203. Permanent magnet 204. Retaining ring

205. Fixture

Hereinafter, the present invention will be described in more detail with reference to the attached FIGS. 5 to 8 as an embodiment.

5 is a longitudinal cross-sectional view illustrating a brushless motor having a rotor according to the present invention, FIG. 6 is a longitudinal cross-sectional view illustrating the rotor according to the present invention, FIG. 7 is a cross-sectional view taken along line BB of FIG. 5, and FIG. As a perspective view showing a part of the former, the present invention relates to a rotating shaft 201, a rotor core 202, which has a predetermined thickness and is superimposed on the rotating shaft, and an N, S magnetic pole on the outer circumferential surface of the rotor core. Four permanent magnets (203) having an array sequentially contacted and rounded at both ends of the outer end, and a molding ring formed in contact with both sides of the rotor core to hold both ends of the permanent magnet (203). 204 and a plurality of fixing tables 205 which are formed together with the fixing rings 204 to be filled between the four permanent magnets 203 to hold the outside of each permanent magnet 203.

The process of installing the rotor of the present invention configured as described above to be rotatable in the stator 1 is the same as that described in the related art and thus will be omitted.

Hereinafter, a process of manufacturing the rotor of the present invention will be described in detail.

Four permanently processed cores of the rotor core 202 overlapping each other and having a predetermined thickness are fixed to the rotating shaft 201 and rounded at both ends of the rotor core 202 to the outer circumferential surface of the rotor core 202. The magnets 203 are brought into contact with each other so that the N and S poles are sequentially arranged.

As such, when the rotor core 202 having the permanent magnet 203 in contact with the outer circumferential surface is inserted into the mold, and the mold is injected into the mold, the rotor core 202 is in contact with both sides of the rotor core 202 due to the shape of the mold. As the fixing ring 204 is molded and at the same time, the holder 205 is molded to be filled between the permanent magnets 203, so that both ends of the permanent magnet 203 are integrated as the fixing ring 204 and the holder 205 are integrated. Hold the outside with a grip, and thus the permanent magnet 203 is fixed while the manufacture of the rotor of the present invention is completed.

The stator 205 filled between the permanent magnets 203 to hold the outer surface of each permanent magnet 203, the outer side of each end of each permanent magnet is rounded, so each of the stator 205 in the molded state Since the outer side is wider than the inner side, it is possible. Accordingly, when the rotor of the present invention is applied to the brushless motor, the permanent magnet 203 does not occur even if the rotor rotates.

Applying the rotor (2) manufactured through such a process to a brushless motor to use the brushless motor to cause the rotor to rotate by the induced current generated between the stator (1) and the rotor (2) In this case, since the permanent magnets 203 are exposed to the outside, the current between the stator 1 and the rotor 2 is maintained as the distance between the permanent magnets and the stator 1 is kept to a minimum. It is understood that the efficiency increases as the generation becomes stable.

As described above, the rotor structure of the brushless motor of the present invention is manufactured as a whole because it is a structure in which a pair of fixing plates and a plurality of fixing rods are integrally molded and molded with a permanent magnet in contact with the outer side of the rotor core. As workability is improved, productivity is increased and production costs are also reduced.

In addition, since the permanent magnet is exposed to the outside in the manufactured state, when the rotor is applied to the brushless motor, the gap between the permanent magnet and the stator of the rotor can be minimized. Induction current generated between the electrons and the stator is stabilized, the efficiency is also improved.

Claims (1)

Rotation axis, A rotor core overlapping each other with a predetermined thickness and pressed into the rotating shaft; Four permanent magnets which are in contact with the outer peripheral surface of the rotor core in order to have an N, S stimulus array sequentially rounded both ends, A fixing ring formed in contact with both sides of the rotor core to hold both ends of the permanent magnet; The rotor structure of the brushless motor, characterized in that the molding is formed with each of the fixing ring to be filled between the four permanent magnets are configured with a plurality of fixing to hold the outside of each permanent magnet.