KR101871776B1 - Brush-less direct current motor and method for preventing electric corrosion thereof - Google Patents

Brush-less direct current motor and method for preventing electric corrosion thereof Download PDF

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Publication number
KR101871776B1
KR101871776B1 KR1020170019456A KR20170019456A KR101871776B1 KR 101871776 B1 KR101871776 B1 KR 101871776B1 KR 1020170019456 A KR1020170019456 A KR 1020170019456A KR 20170019456 A KR20170019456 A KR 20170019456A KR 101871776 B1 KR101871776 B1 KR 101871776B1
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KR
South Korea
Prior art keywords
bearing
rotating shaft
bearings
motor
rotor
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KR1020170019456A
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Korean (ko)
Inventor
이승헌
문태호
최산호
강병환
이정석
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(주)코리아인코어테크놀러지
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Priority to KR1020170019456A priority Critical patent/KR101871776B1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/02—Shafts; Axles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2786—Outer rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
    • H02K5/1732—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at both ends of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/003—Couplings; Details of shafts
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/08—Structural association with bearings
    • H02K7/083—Structural association with bearings radially supporting the rotary shaft at both ends of the rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2202/00—Solid materials defined by their properties
    • F16C2202/30—Electric properties; Magnetic properties
    • F16C2202/40—Magnetic

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

[0001] The present invention relates to an electric lock type external brushless DC motor and a method of preventing electric shock of an external type brushless DC motor, wherein an insulating bushing for a bearing is installed in a bearing coupling portion of a rotating shaft, (Or a magnetic sacrificial anode) is provided at both ends of the rotating shaft so that a minute current flowing in the bearing is transmitted to the rotating shaft To improve the characteristics of the BLDC motor and effectively prevent corrosion and erosion phenomenon. It is also applicable to the wear resistance of the rotating shaft structure, the chemical resistance due to the chemicals and the use atmosphere, Improvement can be expected.

Description

Field of the Invention [0001] The present invention relates to a brushless DC motor and a brushless DC motor, and more particularly, to a brushless DC motor having an insulation bushing structure for an elastic bearing, FOR PREVENTING ELECTRIC CORROSION THEREOF}

The present invention relates to an electric lock type external brushless DC motor using an insulating bushing structure for a bearing in which an insulating coating is not required and a cut hole is formed on the outer peripheral surface, and a method for preventing electric shock of other typical brushless DC motors, The bearing bushing for the bearing is provided in the bearing coupling portion of the rotary shaft to be brought into contact with the bearing inner ring of the bearing so that the static electricity and the minute electric current charged through the rotary shaft are insulated so as not to be transmitted to the inner ring and the outer ring, A magnetic self-sacrificial metal (or magnetic sacrificial anode) is provided at both ends to induce micro-currents flowing through the bearing to both ends of the rotating shaft, thereby effectively preventing corrosion and erosion by improving the characteristics of the BLDC motor. Abrasion resistance, chemical resistance due to chemicals and use atmosphere, And more particularly, to a method of preventing electric leakage of an electric motor having an electric braking preventing type electric motor using an insulation bushing for a bearing which does not require an insulating coating, .

Generally, the electric motors using permanent magnets in a motor include a brush DC motor and a brushless DC motor.

A Brushless Direct Current Motor (BLDC) is a brushless direct current motor, which, unlike a brushless DC motor, has no brush inside the motor.

Brushless DC motors are electric motors in which a mechanical commutator (slip ring) of a DC motor or a synchronous motor is electrically switched. Since there is no need to supply a current to a rotating shaft, a commutator or a slip ring and a brush are not necessary, There is an advantage of low noise and easy maintenance.

Recently, a brush less direct current motor (BLDCM) has been widely used from a large motor application system to a small servo system.

The brushless DC motor has a very high ratio of instantaneous torque to rated torque, so that it has excellent dynamic response characteristics and maintains high efficiency over a wide operating range, which is advantageous for variable speed operation and control. In addition, since there are no mechanical brushes and commutators, maintenance and repair costs are low and the use environment is limited.

The brushless direct current (DC) motor is divided into an internal type in which the rotor is located inside and an external type in which the rotor is located on the outside. The description of the present invention will be made with respect to the external type brushless DC motor.

The rotor of a brushless DC motor is manufactured by using a permanent magnet, and it is called a 2 pole, a 4 pole, a 6 pole, an 8 pole, etc. depending on whether a pair of N pole / S pole is formed. For reference, if it consists of a pair of magnets, that is, one N pole and one S pole, it is called a two pole (pole) motor.

The stator of a brushless DC motor is composed of three windings with a structure in which a plurality of iron cores are wound around a coil. A permanent magnet is used for the rotor, an armature core is provided for the stator, and a current direction and a rotation angle of the core are determined by using a sensor (Hall sensor, Photo Diode) to have the same characteristics as the brush type.

The electric current of the armature is made to flow so that the magnetic field generated in the armature core is always at 90 ° with the fixed magnetic pole provided in the rotor. Generally, three or four phase inverters are used to change the direction of current.

FIG. 1 is an exploded perspective view showing a general external type brushless DC motor, FIG. 2 is an assembled perspective view showing a rotor assembly of a general external type brushless DC motor, and FIG. 3 is a perspective view of a general external type brushless DC motor Fig. 4 is a perspective view showing a general bearing. Fig.

Referring to FIGS. 1 to 4, a general external brushless DC motor 1 mainly includes a stator assembly 10 and a rotary assembly 20.

The stator assembly 10 includes an armature core 11 in which a coil is wound around a plurality of iron cores, an insulator 12 positioned between the cores 11, and a holder 13 for fixing the armature core 11 do.

The bearing housing 14 formed vertically to the center of the holder 13 is installed through the center of the armature core 11 and the upper and lower portions of the armature core 11 are respectively provided with an upper bearing 15 and a lower bearing 16 ) Is installed. The upper bearing 15 and the lower bearing 16 have in-bearing, outer ring and bearing balls.

The rotor assembly 20 includes a rotor housing 21 to which the rotary shaft 22 is press-fitted and fixed, a rotor ring 23 to be coupled to the inner periphery of the rotor housing 21, And a plurality of permanent magnets 24 of N pole / S pole.

The rotary shaft 22 is installed through the center of the upper bearing 15 and the lower bearing 16 and is rotatably supported by the upper bearing 15 and the lower bearing 16. [

The arrangement of the permanent magnets 24 is called a two-pole, a four-pole, a six-pole, an eight-pole or the like depending on how many pairs of N-poles / S- For reference, if it consists of a pair of magnets, that is, one N pole and one S pole, it is called a two pole (pole) motor. The rotor assembly 20 is rotated using the current direction of the winding in the armature core, the position of the permanent magnet 24, and a sensor (Hall sensor, Photo Diode).

A sudden surge voltage is applied to a bearing ball driven by electric charges flowing in the rotor assembly 20 and a voltage induced in the stator assembly 10 to discharge the electric current through electric current flowing between the bearing ball and the oil ) May be repeated to cause electric corrosion.

When the electric current flows in the contact portion between the raceway wheel of the bearing and the rotating shaft during rotation, the electric motor causes spark through the thin lubricating oil film, and the surface of the rotating shaft is locally melted and uneven.

It is known that the cause of the electromotive force is caused by the potential difference between the inner and outer rings of the bearing. To prevent the electromotive force, a separate electric circuit must be installed or the bearing should be isolated so that no current flows through the bearing.

Fig. 5 (a) is a photograph showing the front side of the stripe pattern formed on the raceway surface of the bearing inner ring of the tapered roller bearing, Fig. 5 (b) is a photograph showing the front side of the stripe pattern generated on the rolling surface of the tapered roller , And FIG. 5 (c) is a photograph showing a dark color created on the entire raceway surface of the bearing ball.

Referring to the above drawings, in the conventional external brushless DC motor, when the rotating shaft rotates, electric power is generated in the form of a ridge-like shape and a stripe-shaped concavo-convex shape, and charging and discharging of the rotating shaft by electrostatic charge / There is a problem in that the bearing surface is brought into contact with the inner and outer rings of the bearing to generate a spot on the bearing contact point of the bearing to thereby cause local irregularities and electric phenomenon on the surface of the rotating shaft to lower the motor performance and shorten the service life due to noise and vibration.

Korean Patent Registration No. 10-1502288

In the present invention, an insulating bushing for a bearing is provided in a bearing coupling portion of a rotary shaft to be brought into contact with a bearing inner ring of a bearing, so that static electricity and minute electric current charged through the rotary shaft are isolated and prevented from being transmitted to the bearing, A magnetic self-sacrificial metal (or magnetic sacrificial anode) is provided at both ends of the shaft to induce and distribute micro-currents flowing through the bearing to both ends of the rotating shaft, thereby effectively preventing corrosion and erosion by improving the characteristics of the BLDC motor. It is the electric shock prevention type outer brushless DC motor which can expect the lifetime of the motor to be improved by the wear resistance of the shaft structure, the chemical resistance due to the chemical agent and the use atmosphere, and the prevention of the electromotive force by energization, and the other type brushless DC motor The present invention has been made in view of the above problems.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an electric lock type external brushless DC motor using an insulated bushing structure for an elastic bearing in which an insulating coating is unnecessary, Provide a method to prevent electric shock.

The present invention provides a stator assembly comprising: an armature core having a plurality of iron cores wound with coils; an insulator disposed between the cores; and a holder having a bearing housing fixedly supporting the armature core and formed vertically in the center; A plurality of bearings installed in the bearing housing, the bearings including an outer ring and a bearing ball; And a rotor assembly comprising a rotor housing into which a rotary shaft is press-fitted and fixed, a rotor ring coupled to an inner periphery of the rotor housing, and a plurality of N pole / S pole permanent magnets annularly mounted inside the rotor ring The outer rotor type brushless DC motor according to claim 1, wherein the rotating shaft is provided to penetrate a center of the bearing, and is rotatably supported by the bearing, wherein the rotating shaft, which is in contact with the bearing inner ring of the bearing, An insulating bushing for a bearing is installed in the bearing coupling portion of the bearing so that static electricity and minute electric current charged through the rotary shaft are isolated from being transmitted to the bearing and the outer ring.

The bearing coupling portion of the rotary shaft is formed to have a step lower than the surface of the rotary shaft. A fixing protrusion is formed on an outer circumferential surface of the bearing coupling portion, and a cutting line is formed in the insulating bushing for bearing corresponding to the fixing protrusion , The fixing bosses are resiliently engaged in the cutting line in a state where the insulating bushing for the bearing is elastically opened and inserted into the bearing coupling portion to fix the position of the insulating bushing for the bearing.

A magnetic sacrificial metal (or a magnetic sacrificial anode) is provided at both ends of the rotating shaft so that a minute current flowing through the bearing can be guided to both ends of the rotating shaft.

According to another aspect of the present invention, there is provided a stator assembly comprising: an armature core having a plurality of iron cores wound with coils; an insulator disposed between the cores; and a holder having a bearing housing formed to vertically support the armature core. A plurality of bearings installed in the bearing housing, the bearings including an outer ring and a bearing ball; And a rotor assembly comprising a rotor housing into which a rotary shaft is press-fitted and fixed, a rotor ring coupled to an inner periphery of the rotor housing, and a plurality of N pole / S pole permanent magnets annularly mounted inside the rotor ring A method of preventing electromagnetism in an external type brushless DC motor, comprising: a first step of manufacturing the rotating shaft so that a bearing portion of the rotating shaft has a lower step than a surface of the rotating shaft; A second step of installing an insulating bushing for a bearing in the bearing coupling portion of the rotating shaft to be in contact with the bearing inner ring of the bearing; And a third step of providing an active magnetic sacrificial metal (or a magnetic sacrificial anode) at both ends of the rotating shaft to induce a galvanic phenomenon through the sacrificial metal to suppress the electromotive force.

As described above, according to the present invention, the bearing coupling portion of the rotating shaft, which is brought into contact with the bearing inner ring of the bearing, is provided with the insulating bushing for the bearing having the incision line on the outer peripheral surface, (Or a magnetic sacrificial anode) is formed on both ends of the rotating shaft, and a magnetic shielding layer is formed on both ends of the rotating shaft so that static electricity and micro-current charged through the rotating shaft are prevented from being transmitted to the outer ring, ) Is provided to induce and distribute minute currents flowing in the bearings to both ends of the rotating shaft to effectively prevent the electric phenomenon by improving the characteristics of the BLDC motor and to improve the wear resistance of the rotating shaft structure, It is expected to improve the lifetime of the motor by preventing electric current by energizing. Can.

In addition, it prevents the occurrence of spots due to surge voltage due to the surge voltage of the bearing ball contact when generating electric current in the bearing, prevents the occurrence of sintering due to the potential difference between the bearing ball and oil due to the minute current, gradually increases with time, In order to improve the noise generation caused by friction and collision, the electric insulation prevents and prevents the electric induction. The insulation bushing structure is adopted to prevent electric shock, and also to prevent wear, heat resistance, chemical resistance, durability, friction coefficient, Can be improved or strengthened.

Further, the bearing insulating bushing is provided at the step of the bearing coupling portion of the rotary shaft, so that the entire structure is simple, and the rotary shaft insulating coating is unnecessary.

In addition, galvanic phenomena can be induced by fastening or plating the zinc screw, which is a sacrificial anode, to both ends of the rotating shaft, thereby preventing corrosion of the rotating shaft and indirect insulation effect of the bearing coupling portion.

In addition, although permanent magnets are attached to the inside of the rotor housing, unlike a conventional motor in which efficiency is reduced due to a large amount of leakage flux, leakage magnetic flux is reduced, and an effect of easy magnet attachment is also expected.

Further, since the rotor housing and the magnet lining form a core integrally formed, it is easy to assemble, and lightweight can be realized efficiently by the lightweight aluminum rotor housing.

1 is an exploded perspective view showing a general external brushless DC motor;
2 is a perspective view showing a rotor assembly of a conventional external brushless DC motor.
3 is an exploded perspective view showing a rotor assembly of a general external type brushless DC motor.
Figure 4 is a perspective view of a typical bearing;
Fig. 5 (a) is a photograph showing the front side of the stripe pattern formed on the raceway surface of the tapered roller bearing inner ring, Fig. 5 (b) is a photograph showing the front side of the tapered roller bearing, (C) is a photograph showing a dark color created on the entire bearing ball rolling surface
6 is a vertical cross-sectional view showing an electric lock type external brushless DC motor of the present invention of the present invention
7 is an actual photograph showing the rotating shaft and the bearing of the present invention
FIG. 8 is a perspective view showing a combined perspective view in which a bearing bushing is coupled to a bearing coupling portion of a rotating shaft according to the present invention.
Fig. 9 is a perspective view of the bearing bushing of the rotary shaft according to the present invention,
10 is a front view of Fig. 8
11 is a view showing a magnetic sacrificial metal provided at both ends of a rotating shaft of the present invention
12 is a block diagram for explaining a method for preventing the electric motor of an external type brushless DC motor according to the present invention

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, with reference to the accompanying drawings, a description will be given in detail of an electric lock prevention type outer brushless DC motor of the present invention and a method of preventing electrification of an external conventional brushless DC motor. In the figure, the same reference numerals as those in the conventional configuration are assigned to the same components as those in the conventional configuration, and a description thereof will be made with reference to the conventional drawings.

FIG. 6 is a longitudinal sectional view showing an electric lock type external brushless DC motor according to the present invention of the present invention, FIG. 7 is an actual photograph showing a rotating shaft and a bearing of the present invention, FIG. 9 is an exploded perspective view in which a bearing bushing is separated from a bearing coupling portion of a rotating shaft according to the present invention, FIG. 10 is a front view of FIG. 8, and FIG. 11 is a diagram showing a magnetic sacrificial metal (or magnetic sacrificial anode) provided at both ends of the rotating shaft of the present invention.

Referring to the drawings, the electric lock type external brushless DC motor of the present invention includes a stator assembly 10, a rotor assembly 20, and a plurality of bearings 115 and 116.

The stator assembly 10 includes an armature core 11 in which a coil is wound on a plurality of iron cores 11, an insulator 12 positioned between the cores 11, a bearing 12 fixedly supporting the armature core 11, And a holder (13) provided with a housing (14).

The rotor assembly 20 includes a rotor housing 21 into which the rotating shaft 122 is press-fitted and fixed, a rotor ring 23 coupled to the inner periphery of the rotor housing 21, And a plurality of permanent magnets 24 of N pole / S pole.

The plurality of bearings (115, 116) are disposed on the upper and lower sides of the bearing housing (14), respectively, and have bearings, outer rings and bearing balls.

The rotating shaft 122 is installed through the center of the bearings 115 and 116 and is rotatably supported by the bearings 115 and 116. The rotary shaft 122 is carburized and nitrided to general steel (SM 45C-carbon steel) to reduce the cost.

The rotating shaft 122 is installed through the center of the bearings 115 and 116 and is rotatably supported by the bearings 115 and 116.

As a technical feature of the present invention, an insulating bushing 130 for a bearing is installed in a bearing coupling portion of a rotating shaft 122 which is brought into contact with an inner bearing wheel of the bearings 115 and 116 for preventing electric shock.

That is, the bearing bushing of the rotating shaft 122 is formed to have a step lower than the surface of the rotating shaft 122, the insulating bushing 130 for the bearing is coupled to the bearing coupling portion, As shown in FIG.

In addition, a fixing protrusion is formed along the oblique direction on the outer circumferential surface of the bearing coupling portion, and a cutting line 131 is formed in the insulating bushing for bearing 130 in correspondence thereto. The fixing bosses are elastically engaged in the incision line 131 in a state where the insulating bushing 130 for a bearing is elastically spread and inserted in the bearing coupling portion so as to firmly fix the position of the insulating bushing 130 for a bearing .

The surface of the rotating shaft 122 and the surface of the insulating bushing 130 for a bearing are formed at the same level so that the step is eliminated and flattened when the insulating bushing 130 for a bearing is elastically spread and inserted into the bearing coupling portion.

(Not shown) that is resistant to high strength, heat resistance and dynamic load for bearing to securely couple and fix the rotating shaft 122 and the insulating bushing 130 for bearing, and thus has excellent chemical resistance and excellent insulation characteristics.

The insulating bushing 130 (see FIG. 10) for a bearing is excellent in abrasion resistance, chemical resistance, and heat resistance because it is used for preventing electric shock at high dynamic load, 250 ° C continuous use temperature and 65 MPa compressive strength, No additional insulation coating is required.

Referring to FIG. 11, a self-sacrificial metal (or a self-sacrificial anode) 150 (see FIG. 11) is provided at both ends of a rotating shaft 122 so that a minute current flowing in the bearings 115 and 116 can be guided to both ends of the rotating shaft 122, May be provided. The self-sacrificial metal can be used in various ways, such as fastening zinc screws, plating or attaching them.

In the meantime, the present invention relates to an external brushless DC motor including a rotor assembly 20, a stator assembly 10, and bearings 115 and 116 for rotatably supporting a rotating shaft of the rotor assembly 20, As a method for prevention of electric shock, the following steps are included.

Fig. 12 is a block diagram for explaining a method of preventing the electric motor of an external type brushless DC motor according to the present invention.

Referring to the above drawings, the electric current prevention method of the present invention includes an armature core 11 in which a coil is wound around a plurality of iron cores, an insulator 12 positioned between the cores 11, A stator assembly (10) having a holder (13) with a bearing housing (14) formed to support and vertically form a center; A plurality of bearings (115, 116) installed in the bearing housing (14) and having bearings, outer rings and bearing balls; And a plurality of N poles / rotors 23 mounted annularly inside the rotor ring 23, a rotor ring 23 coupled to the inner periphery of the rotor housing 21, (12) comprising a permanent magnet (24) of an S-pole, wherein the rotating shaft (122) is provided with a rotating shaft (122) A first step (S10) of manufacturing the rotating shaft (122) so that the step is lower than the surface; A second step (S20) of installing an insulating bushing (130) for a bearing in a bearing coupling portion of a rotating shaft (122) to be brought into contact with an inner bearing wheel of a bearing (115,116); And a third step (S30) of providing an active magnetic sacrificial metal at both ends of the rotating shaft 122 so as to induce a galvanic phenomenon through the sacrificial metal to suppress the electromotive force.

In the second step S20, the fixing bosses are engaged in the incision line 131 in a state where the insulating bushing 130 is resiliently opened and inserted into the bearing coupling portion, so that the position of the insulating bushing 130 for a bearing . Further, since the pressure sensitive adhesive (not shown) which is resistant to high strength, heat resistance and dynamic load of bearings can be used to securely couple and fix the rotating shaft 122 and the insulating bushing 130 for bearings, great.

The surface of the rotating shaft and the surface of the insulating bushing for the bearing are formed at the same level so that the step is eliminated and flattened.

A magnetic sacrificial metal (or a magnetic sacrificial anode) 150 is provided at both ends of the rotating shaft 122 so as to guide and distribute minute currents flowing through the bearings 115 and 116 to both ends of the rotating shaft 122, For example, zinc screws can be fastened, plated or coated.

As described above, according to the present invention, an insulating bushing for a bearing is provided in a bearing coupling portion of a rotating shaft to be brought into contact with a bearing inner ring of a bearing, so that static electricity and minute current charged through the rotating shaft are transmitted to the inner ring and the outer ring (Or magnetic sacrificial anode) is provided at both ends of the rotating shaft as well as the insulation block to induce and distribute the minute current flowing through the bearing to both ends of the rotating shaft, thereby improving the characteristics of the BLDC motor, It is possible to effectively prevent the corrosion phenomenon and to improve the life of the motor by the abrasion resistance of the rotating shaft structure, the chemical resistance due to the chemical agent and the use atmosphere, and the prevention of the electric current by energization.

In addition, it prevents the occurrence of spots due to surge voltage due to the surge voltage of the bearing ball contact when generating electric current in the bearing, prevents the occurrence of sintering due to the potential difference between the bearing ball and oil due to the minute current, gradually increases with time, In order to improve the noise generation caused by friction and collision, the electric insulation prevents and prevents the electric generation. The insulation bushing structure for the inner ring in the bearing is used to prevent electric shock and to prevent wear, heat resistance, chemical resistance, durability, friction coefficient , Electrical insulation resistance can be improved or strengthened.

In addition, since the bearing insulating bushing is provided at the step of the bearing coupling portion of the rotary shaft, the entire structure is simple, the rotary shaft insulating coating is unnecessary, and the insulating coating is unnecessary in the bearing housing.

In addition, galvanic phenomena can be induced by fastening or plating coating of zinc screw, which is a sacrificial anode at both ends of the rotating shaft, to prevent corrosion of rotating shaft and indirect insulation effect of bearing coupling part.

In addition, although permanent magnets are attached to the inside of the rotor housing, unlike a conventional motor in which efficiency is reduced due to a large amount of leakage flux, leakage magnetic flux is reduced, and an effect of easy magnet attachment is also expected.

Further, since the rotor housing and the magnet lining form a core integrally formed, it is easy to assemble, and lightweight can be realized efficiently by the lightweight aluminum rotor housing.

110: uneven portion
115, 116: Bearings
122: rotating shaft
130: Insulation Bushings for Bearings
131: incision line (incisional hole)

Claims (5)

An armature core 11 in which a plurality of iron cores are wound with coils, an insulator 12 positioned between the cores 11, a bearing housing 14 fixedly supporting the armature core 11 and formed perpendicularly to the center, A stator assembly 10 having a holder 13; A plurality of bearings (115, 116) installed in the bearing housing (14) and having bearings, outer rings and bearing balls; And a rotor ring (23) coupled to an inner periphery of the rotor housing (21), and a plurality of N (N) annularly mounted inside the rotor ring (23) And a rotor assembly (20) composed of a permanent magnet (24) of pole / S pole,
The rotating shaft 122 is installed through the center of the bearings 115 and 116 and is rotatably supported by the bearings 115 and 116,
An insulating bushing 130 having a cutting line 131 is installed on the outer peripheral surface of the rotating shaft 122 to be in contact with the bearing inner ring of the bearings 115, And the electric current and the minute electric current charged through the shaft (122) are isolated and prevented from being transmitted to the inside and outside of the bearing. The method according to claim 1,
The bearing coupling portion of the rotary shaft 122 is formed to have a step lower than the surface of the rotary shaft 122. A fixing protrusion is formed on an outer circumferential surface of the bearing coupling portion, A cutout line 131 is formed in the cutout line 130 and the fixing protrusion is elastically coupled into the cutout line 131 in a state where the bearing bushing 130 is elastically opened and inserted into the bearing coupling portion, Wherein the position of the insulating bushing (130) for the bearing is fixed. The method according to claim 1,
A magnetic sacrificial metal (or a magnetic sacrificial anode) 150 is provided at both ends of the rotating shaft 122 so that minute currents flowing through the bearings 115 and 116 can be guided to both ends of the rotating shaft 122 Wherein the brushless DC motor is an electric motor. An armature core 11 in which a plurality of iron cores are wound with coils, an insulator 12 positioned between the cores 11, a bearing housing 14 fixedly supporting the armature core 11 and formed perpendicularly to the center, A stator assembly 10 having a holder 13; A plurality of bearings (115, 116) installed in the bearing housing (14) and having bearings, outer rings and bearing balls; And a rotor ring (23) coupled to an inner periphery of the rotor housing (21), and a plurality of N (N) annularly mounted inside the rotor ring (23) A method of preventing electromagnetism in an outer rotorless DC motor including a rotor assembly (20) composed of permanent magnets (24) of pole / S pole,
A first step (S10) of manufacturing the rotary shaft (122) so that a bearing engagement portion of the rotary shaft (122) has a step lower than the surface of the rotary shaft (122); And
A second step (S20) of installing an insulating bushing (130) for a bearing in the bearing coupling portion of the rotating shaft (122) to be in contact with the bearing inner ring of the bearings (115, 116); , ≪ / RTI &
A third step S30 of providing an active magnetic sacrificial metal (or magnetic sacrificial anode) 150 at both ends of the rotating shaft 122 to induce a galvanic phenomenon through the sacrificial metal to inhibit the electromotive force, Further comprising the step of: applying a voltage to the brushless DC motor. delete
KR1020170019456A 2017-02-13 2017-02-13 Brush-less direct current motor and method for preventing electric corrosion thereof KR101871776B1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120118756A (en) * 2011-04-19 2012-10-29 정복민 Brushless direct current motor
KR101312204B1 (en) * 2012-09-28 2013-09-27 인천경기기계공업협동조합 Outer rotor type brushless dc motor
KR101502288B1 (en) 2014-12-03 2015-03-12 주식회사 태양전기 Shaft For Preventing electric corrosion of BLDC motor with integrated housing and shaft

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120118756A (en) * 2011-04-19 2012-10-29 정복민 Brushless direct current motor
KR101312204B1 (en) * 2012-09-28 2013-09-27 인천경기기계공업협동조합 Outer rotor type brushless dc motor
KR101502288B1 (en) 2014-12-03 2015-03-12 주식회사 태양전기 Shaft For Preventing electric corrosion of BLDC motor with integrated housing and shaft

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