CN1725608A

CN1725608A - Brushless DC motor

Info

Publication number: CN1725608A
Application number: CNA2005100057369A
Authority: CN
Inventors: 安详镕; 李亨哲; 金世镇
Original assignee: Samsung Electronics Co Ltd
Current assignee: Samsung Electronics Co Ltd
Priority date: 2004-07-22
Filing date: 2005-01-24
Publication date: 2006-01-25
Also published as: KR20060007865A; JP2006042582A

Abstract

The present invention relates to provide a kind of brushless DC motor.This brushless DC motor comprises stator and rotor, it is characterized in that, described rotor comprises following each several part again: the rotor core that a plurality of core veneers form at the rotating shaft direction lamination; Be combined in the magnet of described rotor core; Be arranged on rotor core two ends in case towards rotating shaft direction extruding be combined in the magnet of rotor core so that be fixed, rubber-like magnet fixed part.Thus, by rubber-like magnet fixed part is set in rotor core, when having realized the simplification of brushless DC motor structure and assembling procedure, can also effectively suppress the vibration of magnet.

Description

Brushless DC motor

Technical field

The present invention relates to motor, relate in particular to the rotor core structure of brushless DC motor.

Background technology

Generally, brushless DC motor is a kind ofly use the switching circuit of electric device for the polarity that the power supply that provides to stator is provided and substitute the motor of the brush of mechanical device, and as the drive unit use of reciprocating compressor etc.

In patent documentation 1, disclose by the magnet that will be combined in rotor and fixed, prevent the brushless DC motor that magnet breaks away from from rotor core.

These brushless DC motors in the past, for the magnet that will be combined in rotor core is fixed, outer peripheral face in rotor core is formed with the jut that is used for fixing the magnet two ends, and be provided with jut and be provided with engagement groove at magnet in rotor core respectively, so that make rotor core and magnet interlock.

By feat of such structure, brushless DC motor in the past, solved the centrifugal force that produces by the high speed rotating of rotor and made magnet, but still do not solved the problem of magnet in the vibration of rotating shaft direction along the circumferencial direction of rotation or the problem of radial direction swing.

And, brushless DC motor in the past, owing to pass through the tightly upper and lower of fixed rotor of top and the bottom hood difference, therefore must the such top and the bottom hood of special preparation.And, also must possess and be used for the top and the bottom hood to the tightly fixing secure component of rotor, thus also to increase by use secure component with the top and the bottom hood to the tightly fixing assembling procedure of rotor.

And, if having the gap between top and the bottom hood and magnet, then exist, and influence the problems such as efficient of brushless DC motor owing to magnet swings up and down vibration and the noise that produces.

[patent documentation 1] Korean registered utility model communique 20-0162042 number

Summary of the invention

The present invention is in view of the above fact, its purpose be to provide a kind of can be by rubber-like magnet fixed part be set in rotor core, when realizing the simplification of motor structure and assembling procedure, effectively suppress the brushless DC motor of magnet vibration.

In order to reach described purpose, the invention provides a kind of brushless DC motor, it comprises stator and rotor, it is characterized in that, and described rotor comprises following each several part again: the rotor core that a plurality of core veneers form at the rotating shaft direction lamination; Be combined in the magnet of described rotor core; And be arranged on described rotor core two ends in case towards the extruding of described rotating shaft direction be combined in the magnet of described rotor core so that be fixed, rubber-like magnet fixed part.

In addition, the invention provides another kind of brushless DC motor, it comprises stator and rotor, it is characterized in that described rotor comprises following each several part again: the rotor core that the 1st single core veneer, a plurality of the 2nd core veneer and the 3rd single core veneer form at the rotating shaft direction lamination; Be combined in the magnet of described rotor core; And be arranged on the described the 1st and the 3rd core veneer so as to push towards described rotating shaft direction described combination core magnet so that be fixed, rubber-like magnet fixed part.

According to brushless DC motor of the present invention,, the rubber-like fixed part rotating axial vibration because, therefore can fully removing the magnet that is caused by the rotor high-speed rotation from rotor core two ends extruding magnet.

And, owing on the veneer of rotor core, be provided with the magnet fixed part, therefore can save the top and the bottom hood and be the operation of appending of assembling top and the bottom hood.

Particularly, because the magnet fixed part has elasticity, therefore can eliminate the gap between magnet and the magnet fixed part, thereby can suppress swinging up and down of magnet, and then suppress vibration and noise greatly.

Description of drawings

Fig. 1 is the sectional drawing of expression according to the brushless DC motor of an embodiment of the invention.

Fig. 2 is a schematic diagram of representing the rotor core veneer of brushless DC motor as shown in Figure 1.

Fig. 3 is a schematic diagram of representing the rotor structure of brushless DC motor as shown in Figure 1.

Fig. 4 is a schematic diagram of representing the operating characteristics of brushless DC motor as shown in Figure 1.

Embodiment

Below, referring to figs. 1 through Fig. 4, describe the preferred embodiment for the present invention in detail.

At first, Fig. 1 is a sectional drawing of representing brushless DC motor according to the embodiment of the present invention.As shown in Figure 1, stator coil 102a on stator 102 volumes, side is inserted rotor core 104 within it.In conjunction with a plurality of magnet (permanent magnet) 106, and be not provided with magnet fixed part 108a in rotor core 104 in the mode of rotating shaft direction swing with the magnet 108 of this combination.Rotor is made of above-described rotor core 104 and magnet 108.

Fig. 2 is a schematic diagram of representing the rotor core veneer of brushless DC motor as shown in Figure 1.The figure shows outermost in constituting a plurality of core veneers of rotor core 104, promptly be configured in the middle of the core veneer at two ends one.As shown in Figure 2, the core veneer 104a at rotor 104 is provided with magnet fixed part 108a.This magnet fixed part 108a, be when possessing elasticity and be bent to form, with the mode outstanding and described core veneer 104a from core veneer 104a towards radial direction as integrally formed flexure strip, and, and crimping is combined in an end of the magnet 106 of rotor core 104.Thereby,, then can effectively suppress the swing (along the axial swing of rotation) of magnet 106 by crimping magnet 106 if such core veneer 104a is separately positioned on the two ends of rotor core 104.

Fig. 3 is an exploded perspective view of representing the rotor structure of brushless DC motor as shown in Figure 1.As shown in Figure 3, rotor core 104 is to be formed at rotating shaft 300 direction laminations by the 1st single core veneer 104a and a plurality of the 2nd core veneer 104c and the 3rd single core veneer 104b.In this rotor core 104 in conjunction with magnet (permanent magnet) 106, and, at the 1st and the

3rd core veneer

104a, 104b is last distribute be provided be used for that magnet 106 is fixed towards rotating shaft 300 direction crimping with combine with rotor core 104, possess flexible magnet fixed part 108a, 108b.That is, with the magnet 106 that combines with a plurality of core veneer 104c of lamination not in the mode of rotating shaft 300 directions swing, from the elasticity crimping of the two ends of rotor core 104.

Fig. 4 is a schematic diagram of representing the operating characteristics of brushless DC motor as shown in Figure 1.Wherein, Fig. 4 (A) represents the noise that the rotor of brushless DC motor in the past produces when rotated and the figure of vibration characteristics; Fig. 4 (B) is the noise that produces when rotated of rotor of expression brushless DC motor of the present invention and the figure of vibration characteristics.Comparison diagram 4 (A) and Fig. 4 (B) compare with brushless DC motor in the past as can be known, and noise that the rotor of brushless DC motor of the present invention produces when rotated and vibration characteristics are more good.

Claims

1. a brushless DC motor comprises stator and rotor, it is characterized in that:

Described rotor comprises following each several part again:

The rotor core that a plurality of core veneers form at the rotating shaft direction lamination;

Be combined in the magnet of described rotor core;

And be arranged on described rotor core two ends in case towards the extruding of described rotating shaft direction be combined in the magnet of described rotor core so that be fixed, rubber-like magnet fixed part.

2. brushless DC motor according to claim 1 is characterized in that:

Described a plurality of core veneer is formed with the magnet engagement groove respectively, and at described magnet engagement groove in conjunction with described magnet;

Being formed at the magnet engagement groove part of two core veneers that are arranged on described two ends of rotor, be formed with described magnet fixed part.

3. as brushless DC motor as described in the claim 2, it is characterized in that:

Described magnet fixed part be with described core veneer with integrally formed flexure strip.

4. as brushless DC motor as described in the claim 3, it is characterized in that:

Described flexure strip is outstanding from described core veneer towards radial direction, the two ends of the magnet of the described combination of crimping.

5. as brushless DC motor as described in the claim 3, it is characterized in that:

Described flexure strip is to possess flexible mode bending, the two ends of the magnet of the described combination of crimping.

6. a brushless DC motor comprises stator and rotor, it is characterized in that:

Described rotor comprises following each several part again:

The rotor core that the 1st single core veneer, a plurality of the 2nd core veneer and the 3rd single core veneer form at the rotating shaft direction lamination;

Be combined in the magnet of described rotor core;

And be arranged on the described the 1st and the 3rd core veneer so as to push towards described rotating shaft direction described combination core magnet so that be fixed, rubber-like magnet fixed part.