KR20130109867A - Motor with rotor for optimizing center of gravity - Google Patents

Abstract

The present invention relates to a motor, the configuration of which is a bushing; A stator installed on an outer surface of the bushing; A rotor rotatably installed relative to the stator; The rotor includes an outer rotor housing, the shaft is connected to the rotor rotatably installed with respect to the bushing; including, the outer diameter of the outer rotor housing toward the bushing from where the shaft and the rotor is connected It is characterized in that it becomes smaller. According to the above configuration, since the outer rotor housing has a different diameter, the center of gravity can be balanced to balance the center of gravity so that the motor can be efficiently used.

Description

Motor with rotor for optimizing center of gravity

The present invention relates to a motor, and more particularly to a BLDC (Brushless DC) motor characterized by a structure that can balance the center of gravity by varying the outer diameter of the outer rotor housing.

A technique related to a conventional rotor manufacturing method is disclosed in Japanese Laid-Open Patent Publication No. 2011-182602.

A plurality of base forming processes for forming a base of the rotor cover and a cross-sectional heat transfer-shaped support region corresponding to each of the curved surfaces of the magnet and protruding outward in the radial direction are formed in plural. A support region forming step to be arranged, a mounting step of arranging a plurality of magnets on the outer circumferential surface of the rotor core and mounting them on a base, and a portion around the opening in the base And a shade portion forming step of forming a shade portion that deforms and extends inside the radial direction. In the supporting region forming step, the inner surface of the supporting region is formed with a radius of curvature smaller than that of the curved surface of the magnet.

Such a motor has a problem of generating vibration and noise during rotation due to the heavy weight of the balance weight.

In addition, there is a problem that not only causes inconvenience to the process but also greatly reduces productivity.

The present invention is to solve the above-mentioned problems, it is possible to secure the balance by configuring a structure that can balance the center of gravity by varying the outer diameter of the outer rotor housing is to reduce the vibration.

The motor of the present invention comprises a bushing; A stator installed on an outer surface of the bushing; A rotor rotatably installed relative to the stator; The rotor includes an outer rotor housing, the shaft is connected to the rotor rotatably installed relative to the bushing; An outer diameter of the outer rotor housing may be reduced as the shaft and the rotor are connected toward the bushing.

The present invention has the advantage of being able to balance the center of gravity by being configured in a structure that can balance the center of gravity by varying the outer diameter of the outer rotor housing.

In addition, the present invention has the advantage of reducing the vibration and noise during rotation due to ensuring the balance.

In addition, the present invention has the advantage that not only can the workability be convenient, but also the productivity is increased.

1 is an exploded view illustrating each member constituting a conventional rotor.
2 is a perspective view of a motor according to a preferred embodiment of the present invention.
3 is a perspective view of a rotor according to a preferred embodiment of the present invention.
4 is a perspective view of a stator according to a preferred embodiment of the present invention.
5 is a perspective view of a shaft according to a preferred embodiment of the present invention.
6 is a perspective view of a bushing according to a preferred embodiment of the present invention.
7 is a perspective view of a rotor according to another embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately The present invention should be construed in accordance with the meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

[Configuration of Motor]

As shown in FIGS. 2 to 7, the motor of the present invention includes a bushing 100, a stator 200 installed on an outer surface of the bushing 100, and a rotor 300 rotatably installed with respect to the stator 200. The shaft 400 is connected to the rotor 300 and rotatably installed with respect to the bushing 100, and includes a first bearing 470 and a second bearing 480 installed on an inner surface of the bushing 100.

The rotor 300 of the present invention includes an outer rotor housing 310, an outer rotor 320 installed inside the outer rotor housing 310, and a magnet 330 fixed to an inner circumferential surface of the outer rotor 320.

In addition, the outer rotor 320 in which the magnet 330 to be described below is inserted into the rotor 300 has a plurality of protrusions 340 formed therein, and the magnet 330 is formed in the groove 350 formed between the protrusions 340. Insert assembly is fixed so that the magnet 330 is not separated.

The rotor 300 and the shaft 400 may forcibly press-fit the shaft 400 by forming a null ring 440 at a force indentation method by an interference fit and a coupling portion of the shaft 400.

The first bearing 470 and the second bearing 480 have a structure for transmitting power and displacement by rotating the object with a small friction while supporting force and weight.

The first bearing 470 and the second bearing 480 are arranged in a structure in which the rotor 300 distributes an unbalanced load generated by the rotation of the shaft 400.

The first bearing 470 is disposed inside the outer rotor housing 310, and it is advantageous to install the first bearing 470 as close to the outer rotor housing 310 and the first shaft 410 as possible by the load applied to the outer rotor housing 310. .

In addition, the second bearing 480 is disposed outside the outer rotor housing 310.

The arrangement structure of the first bearing 470 and the second bearing 480 can effectively reduce the vibration transmitted during the rotation.

[First Embodiment of Rotor]

The rotor 300 includes an out rotor housing 310, an out rotor 320, and a magnet 330, and an accommodating space for accommodating the stator 200 to be described below is formed therein.

The outer rotor housing 310 is made of a contact structure formed integrally, thereby reducing the weight to reduce the rotational resistance and noise to enable high-speed rotation.

In addition, the number of parts of the rotor 300 is reduced and the manufacturing cost is reduced by the simplification of the manufacturing process.

The outer rotor housing 310 has a shaft through hole 311, a housing 315, a first recess 312, a second recess 313, a third recess 314, a first gap 316, A second interval 317, a third interval 318.

The shaft through hole 311 is formed at the center of the rotor 300 to penetrate the shaft 400 to be described below.

The housing 315 forms the entire frame of the outer rotor housing 310 and has a hollow cylindrical shape.

The housing 315 has a first recess 312 formed at an upper side thereof with respect to the axial direction, so that the second recess 313 and the second recess 314 have a third gap 318 at a lower side thereof. Is placed.

Different sizes and structures of the first concave portion 312, the second concave portion 313, and the third concave portion 314 may reduce the weight.

The surface rim 319 of the housing 315 is also rounded.

The first gap 316 is a gap between the first recesses 312 and the second recesses 313, and the first gap 316 is uniformly formed from the center of the outer rotor housing 310 to the outer circumferential surface.

The second gap 317 is a gap between the first recesses 312 and the third recesses 314, and the second gap 317 is uniformly formed from the center of the outer rotor housing 310 to the outer circumferential surface.

The third gap 318 is formed between the second recess 313 and the third recess 314, and the gap of the third gap 318 is wider from the center of the outer rotor housing 310 toward the outer circumferential surface thereof. It is formed into a wider structure.

The housing 315 is made of aluminum.

The out rotor 320 is installed on the inner surface of the out rotor housing 310 and allows the out rotor 320 to be fixed by the protrusion 322 included in the out rotor housing 310.

The outer rotor 320 generates a discharge between the wire and the workpiece, and uses a wire processing method for processing a workpiece using the discharge spark as a saw blade, and is also made of aluminum.

Magnet 330 is fixed to the inner surface of the outer rotor 320, a plurality of spaced at regular intervals are coupled to the outer rotor 320.

The number of magnets 330 is twelve.

In addition, the magnet 330 is preferably nickel plated.

[Second embodiment of the rotor (Fig. 7)]

The housing 315 forms the entire frame of the outer rotor housing 310 and has a hollow shape.

That is, the cross section of the housing 315 is in the form of a letter "C" as a whole.

In addition, the housing 315 has a shape in which the outer diameter of the outer rotor housing 310 decreases toward the first bearing 470 and the second bearing 480 where the shaft 400 and the rotor 300 are connected. have.

That is, the housing 315 has a shape in which the outer diameter of the outer rotor housing 310 decreases toward the bushing 100 from the side where the shaft 400 and the rotor 300 are connected when viewed from the side.

By varying the area of the housing 315, the center of gravity can be moved to the left, ie toward the first shaft.

In addition, the housing 315 can secure a balance while balancing the center of gravity, thereby reducing vibration and reducing noise.

[Configuration of Stator]

The stator 200 is fixed to the inside of the outer rotor housing 310 and is configured to control the operation of the rotor 300.

In addition, the stator 200 is formed to at least partially contact the magnet 330.

The stator 200 includes a bushing insertion hole 210, a plurality of teeth 220, a first corner 221, a second corner 222, a third corner 223, a fourth corner 224, and a fifth corner. 225, sixth corner 226, seventh corner 227, and eighth corner 228.

In addition, the stator 200 is formed by stacking a plurality of thin stator 200, it is possible to efficiently perform the action of the electromagnet.

The bushing insertion hole 210 accommodates the bushing 100 to be described below.

A plurality of teeth 220 are spaced apart along the outer circumferential direction of the bushing insertion hole 210.

As the number of teeth 220 increases, the number of turns of the coil also increases, but the height and number of the teeth 220 may be any number, but the number of teeth 220 is preferably nine.

A coil (not shown) is wound around the tooth 220, and when a current is applied to the stator 200, the rotor 300 is operated by an electromagnetic action between the tooth 220 and the magnet 330. Will rotate.

The first edge 221 is formed to be spaced apart from the bushing insertion hole 210 by a predetermined interval, and connects the tooth 220 and another tooth 220.

The gap between the second edge 222 and the third edge 223 is made narrower toward the outer circumferential surface in the bushing insertion hole 210.

The angle formed by the second edge 222 and the fourth edge 224 may be formed at an obtuse angle, and the angle formed by the third edge 223 and the eighth edge 228 may also be formed at an obtuse angle.

The angle formed by the fourth edge 224 and the fifth edge 225 may be formed at an obtuse angle, and the angle formed by the seventh edge 227 and the eighth edge 228 may also be formed at an obtuse angle.

The sixth edge 226 is rounded to be accommodated in the outer rotor housing 310, and the sixth edge 226 is formed to at least partially contact the magnet 330.

[Configuration of Shaft]

The shaft 400 is inserted into the shaft through hole 311 in the center of the rotor 300 to be rotatably supported in the rotor 300.

The shaft 400 includes a first shaft 410, a second shaft 420, and a third shaft 430, and the first shaft 410 is connected to the second shaft 420, and the second shaft 420 is connected to the third shaft 430

The diameter of the first shaft 410 has a diameter larger than the diameter of the second shaft 420, and the diameter of the second shaft 420 has a diameter larger than the diameter of the third shaft 430.

The first shaft 410 is fixed in the shaft through hole 311 in a cylindrical shape and rotatably supported in the rotor 300.

The knurling 440 is formed on the outer circumferential surface of the first shaft 410, and may be fixed to the inner circumferential surface of the shaft through hole 311 by the knurling 440.

When the shaft 300 is axially pressed into the rotor 300, the pressing force applied from the rotor 300 to the shaft 300 by the knurling 440 increases.

In addition, since the knurling 440 is disposed at regular intervals in an axial linear pattern, the shaft 400 is easily pressed into the rotor 300 to prevent the shaft 400 from slipping away from the rotor 300. Can be.

The second shaft 420 is accommodated in the bushing 100 in a cylindrical shape.

In addition, the second shaft 420 is provided with a locking portion 450 on the shaft surface 451 so that the seed ring 490 can be mounted.

The locking portion 450 has fixing grooves 452 formed at both ends thereof so as to be fixed to the shaft surface 451 of the second shaft 420 with the seed ring 490.

The seal ring 490 is formed to prevent the shaft 400 from being separated.

The third shaft 430 is formed in the bushing 100, one side 431 is a straight line, and the other side 432 is formed of a column having a half moon-shaped bottom surface in a circle.

The third shaft 430 is connected to a compressor for compressing the CO 2 refrigerant of the electric vehicle to change the torque and speed of the rotor to transfer to the shaft 300.

The first bearing 470 and the second bearing 480 are located outside the second shaft 420, and the first bearing 470 and the second bearing 480 are located inside the bushing 100. .

In order to minimize vibration during rotation of the shaft 400, a bearing (not shown) may be installed on the first shaft 410.

[Configuration of Bushing]

The bushing 100 includes a first bushing 110, a second bushing 120, a third bushing 130, a fastening groove 134, and a hole 150.

Bushing 100 has a cylindrical shape with a different diameter, the diameter of the first bushing 110 is a cylindrical shape smaller than the diameter of the second bushing 120, the diameter of the second bushing 120 is a third bushing ( It is formed in a cylindrical shape smaller than the diameter of 130).

A hole 150 is formed at the center of the bushing 100. The hole 150 has an “I” shape empty space formed therein so that the second shaft 420 can penetrate.

The hole 150 of "I" shape is formed in the cylinder shape from which diameter differs.

The first surface 111 is a circumferential side surface portion around the axial direction, and the second shaft 420 and the first bearing 470 are accommodated.

The first bearing 470 is pressed into the first surface 111, and the first surface 111 is formed in a direction perpendicular to the second surface 112.

The second surface 112 is a surface formed in a direction perpendicular to the axial direction and is formed to hold the first bearing 470, and has a flat surface.

The third surface 113 is a surface perpendicular to the second surface 112, and has a cylindrical side surface portion smaller than the first surface 111, and the second shaft 420 is accommodated.

The fourth surface 114 is a surface formed in a direction perpendicular to the axial direction and has a flat surface and is formed in a direction perpendicular to the third surface 113.

Since the space formed by the third surface 113 and the fourth surface 114 is thermally expanded when the first bearing 470 rotates, the space is formed as a thermal expansion clearance.

The bushing 100 receives the first bearing 470 and the second bearing 480, and the first bearing 470 and the second bearing 480 are located outside the shaft 400 and rotatably supported. .

The first bearing 470 includes a first ball 471, a first inner ring 472, and a first outer ring 473.

The first ball 471 is positioned between the first inner ring 472 and the first outer ring 473 in the first bearing 470.

The first inner ring 472 may be in contact with the outside of the second shaft 420 to fix the second shaft 420.

The first outer ring 473 is in contact with the bushing 100, and the outer circumferential surface of the first outer ring 473 is in contact with the second surface 112 of the first surface 111 and the side surface of the first outer ring 473.

A free space is formed between the fifth surface 115 and the second shaft 420 to allow the shaft 400 to rotate inside the bushing 100.

The sixth surface 121 is a surface formed in a direction perpendicular to the axial direction, and has a flat surface.

The seventh surface 122 is a surface perpendicular to the sixth surface 121, and the space formed by the sixth surface 121 and the seventh surface 122 is thermally expanded when the second bearing 480 rotates. It is formed as free space.

The eighth surface 123 is a surface formed in a direction perpendicular to the axial direction and is formed to hold the second bearing 480, and has a flat surface.

The ninth surface 124 is a cylindrical lateral surface portion around the axial direction, and the second shaft 420 and the second bearing 480 are accommodated.

The second bearing 480 is press-fitted into the ninth surface 111, and the eighth surface 123 is formed in a direction perpendicular to the ninth surface 124.

The second bearing 480 includes a second ball 481, a second inner ring 482, and a second outer ring 483.

The second ball 481 is positioned between the second inner ring 482 and the second outer ring 483 inside the second bearing 480.

The second inner ring 482 may be in contact with the outside of the second shaft 420 to fix the second shaft 420.

The second outer ring 483 is in contact with the bushing 100, and the outer circumferential surface of the second outer ring 483 is in contact with the eighth surface 123 of the ninth surface 124 and the second outer ring 483.

The seed ring 490 may be installed at the end of the second bearing 480 to fix the second bearing 480.

In addition, the seal 490 may prevent the shaft 400 from being separated, thereby reducing rotational failure or damage of the motor 300.

The first bearing 470 and the second bearing 480 are configured to rotate the shaft 400 while supporting a load applied to the shaft 400. The first bearing 470 and the second bearing 480 are provided with a ball between the shaft and the bearing to reduce friction by rolling contact. It is desirable to construct a ball bearing which helps to reduce the rotation.

The first step 125 and the second step 131 are formed on the outer circumferential surface of the bushing 100.

The first step 125 is a boundary between the first bushing 110 and the second bushing 120 and is in contact with one side of the out rotor 320 so that the out rotor 320 does not fall out.

In addition, the first step 125 is formed with a flat surface.

The second stepped portion 131 is a boundary portion between the second bushing 120 and the third bushing 130, and has a flat surface.

The fastening groove 134 is formed on one surface of the third bushing 130 so that the fastening member can be fastened, and the fastening groove 134 is axially disposed between one surface of the third bushing 130 and the second step 131. Is formed.

[Rotor Insert Assembly Method]

A shaft through hole 311 is formed at the center of the outer rotor 320, and a plurality of protrusions 340 are formed at the inner edge of the outer rotor 320.

A plurality of protrusions 340 are formed on the inner surface of the shaft through-hole 311 at regular intervals, and a plurality of grooves 350 are formed between the protrusions 340.

The magnet 330 is composed of one or more magnets, and the magnet 330 is configured to conduct magnetic flux induced by the current of the winding field of the stator 200.

The protrusion 340 has a third side 363, an eighth side 365, a ninth side 366, a fourth side 364, a tenth side 367, an eleventh side 368, and a first side. Surrounded by 361, the groove 350 has a tenth side 367, an eleventh side 368, a first side 361, a second side 362, a third side 363, and an eighth side 365, it is surrounded by a ninth side 366.

The number of grooves 350 formed between the protrusions 340 is the same as the number of magnets 330.

When the magnet 330 is inserted into the groove 350, the fifth side 331 of the magnet 330, the first side 361 of the out rotor 320, and the sixth side 332 of the magnet 330. ) And the second side 362 of the out rotor 320, the seventh side 333 of the magnet 330 and the third side 363 of the out rotor 320 are in contact with each other.

The magnet 330 is formed by forming protrusions on the protrusion 340 including the eighth side 365, the ninth side 366, the fourth side 364, the tenth side 367, and the eleventh side 368. ) May be mounted on the out rotor 320 to prevent the detachment.

As a result, the magnet 330 is inserted into the groove 35, so that the rotor 300 can be easily rotated.

The motor of the present invention without departing from the object of the present invention has a structure in which the magnet 330 is inserted into the groove 350 formed between the projection 340, the magnet 330 is the outer rotor 320 Since it does not deviate from the loss of rotational force is prevented to improve the productivity and reliability of the motor.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is to be understood that various changes and modifications may be made without departing from the scope of the appended claims.

100 bushing 110: first bushing
120: second bushing 130: third bushing
200: Stator 300: Rotor
310: Out rotor housing 320: Out rotor
330: magnet 340: projection
350: groove 400: shaft
440: knurling
470: first bearing 480: second bearing

Claims (1)

bushing;
A stator installed on an outer surface of the bushing;
A rotor rotatably installed relative to the stator;
The rotor includes an out rotor housing,
And a shaft connected to the rotor and rotatably installed with respect to the bushing.
And the outer diameter of the outer rotor housing decreases toward the bushing where the shaft and the rotor are connected.

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