TWI840946B - Rotor structure - Google Patents

Abstract

A rotor structure including a shaft, a first ring piece, a second ring piece, a shock absorption piece, and a magnet ring is provided. The first ring piece is securely sleeved around the shaft. The second ring piece is disposed around a periphery of the first ring piece to form an inner space. The shock absorption piece is disposed in the inner space. The magnet ring is sleeve around the second ring piece. The shock absorption piece is attached to the first ring piece and the second ring piece for connecting the first ring piece and the second ring piece as a whole.

Description

Rotor structure

The present invention relates to a rotor structure, and in particular to a rotor structure applied to a brushless motor.

The existing brushless motor is composed of a stator, a rotor and a permanent magnet. The rotor will drive the permanent magnet to rotate relative to the stator. However, during the rotation process of the existing brushless motor, the rotor is prone to vibrate and generate noise, so the rotation quality of the existing brushless motor is poor. To this end, the current solution is to inject rubber material between the rotor and the permanent magnet, and use the characteristics of the rubber material to absorb the vibration of the rotor and the permanent magnet during the rotation process, thereby suppressing the noise during the operation of the motor. However, the vulcanization process of injecting rubber materials requires a high temperature and high pressure environment. High pressure can easily cause the permanent magnet to rupture, and insufficient pressure will cause the rubber material to have insufficient viscosity and be unable to adhere tightly to the rotor and the permanent magnet. Therefore, the vulcanization process has the disadvantage that the temperature and pressure parameters are difficult to adjust, resulting in a low process yield.

The present invention provides a rotor structure having a first ring and a second ring, wherein a damping member is filled between the first ring and the second ring, and a magnetic ring is directly adhered to the outer periphery of the second ring, thereby preventing the magnetic ring from being damaged due to deformation of the damping member.

The rotor structure of the present invention includes a rotating shaft, a first ring, a second ring, a damping member and a magnetic ring. The first ring is sleeved on the rotating shaft. The second ring surrounds the outer periphery of the first ring to form an internal space. The damping member is arranged in the internal space. The magnetic ring is sleeved on the second ring. The damping member is attached to the first ring and the second ring to connect the first ring and the second ring into one body.

In the first embodiment of the present invention, the first ring has a plurality of protrusions, and the plurality of protrusions extend along a radial direction of the shaft toward an inner wall surface of the second ring.

In the first embodiment of the present invention, there is a gap between each of the above-mentioned protrusions and the inner wall surface, and the shock-absorbing member fills the gap.

In the first embodiment of the present invention, the size of the gap is between 0.05 mm and 0.15 mm, which can ensure that the concentricity of the rotor can be controlled between 0.05 mm and 0.15 mm.

In the first embodiment of the present invention, the second ring has a plurality of grooves which are staggered with the plurality of protrusions of the first ring.

In the first embodiment of the present invention, the magnetic ring is adhered to an outer wall surface of the second ring.

In the first embodiment of the present invention, the shock absorbing member is vulcanized rubber.

In a second embodiment of the present invention, the first ring has a plurality of protrusions extending along a radial direction of the shaft toward an inner wall surface of the second ring, and the second ring has a plurality of grooves respectively corresponding to the plurality of protrusions of the first ring.

In the second embodiment of the present invention, an auxiliary sheet is further included, which is arranged on one side of the first ring and the second ring. The auxiliary sheet has an outer ring portion, an inner ring portion and multiple connecting portions. The outer ring portion overlaps with the second ring, and the inner ring portion overlaps with the first ring and is fixed to the rotating shaft. Each connecting portion connects the outer ring portion and the inner ring portion respectively, and the shock absorber covers and adheres to the multiple connecting portions.

In the second embodiment of the present invention, the plurality of connection parts are formed between the outer ring portion and the inner ring portion to form a plurality of through holes, and the plurality of through holes are connected to the internal space.

In the second embodiment of the present invention, the size of the plurality of connecting portions is between 0.5 mm and 2 mm.

In a third embodiment of the present invention, the first ring has a plurality of first protrusions extending along a radial direction of the shaft toward an inner wall surface of the second ring, and the second ring has four second protrusions respectively spaced apart from the corresponding first protrusions of the first ring.

Based on the above, the rotor structure of the present invention has a first ring and a second ring to replace the existing one-piece rotor. In the manufacturing process, the damping member (rubber) is first filled between the first ring and the second ring through a vulcanization process, thereby connecting the first ring and the second ring into one body and the damping member has the effect of damping vibration and anti-noise. Then, the magnetic ring is directly adhered to the outer periphery of the second ring to avoid the concentricity deviation problem caused by the contact between the damping member and the magnetic ring. It can also avoid the disadvantage of the existing rotor structure that the magnetic ring is damaged due to excessive pressure during the vulcanization process.

Fig. 1 is a schematic plan view of a rotor structure of a first embodiment of the present invention. Fig. 2 is a partial enlarged view of the rotor structure of Fig. 1.

Referring to FIG. 1 and FIG. 2 , the rotor structure 100 of the present invention is applicable to a brushless motor, which is used to convert electrical energy into kinetic energy and is widely used in industry, livelihood, transportation, etc. Compared with a brushed motor, its carbon brush will generate carbon powder after long-term use, and the carbon powder is easy to overheat and explode in a high temperature environment. Therefore, a brushless motor is safer and more reliable.

1 and 2 , the rotor structure 100 of the present invention includes a shaft 110 , a first ring 120 , a second ring 130 , a damping member 140 , and a magnet ring 150 .

The rotating shaft 110 is located at the center of the rotor structure 100. The first ring 120 is sleeved on the rotating shaft 110. Specifically, the first ring 120 has a fixing hole 121 for locking the rotating shaft 110 so that the rotating shaft 110 and the first ring 120 can rotate synchronously. The second ring 130 surrounds the outer periphery of the first ring 120 to form an internal space IS, wherein the second ring 130 is spaced from the first ring 120, so there is a gap G between the second ring 130 and the first ring 120. Furthermore, the material of the first ring 120 and the second ring 130 is silicon steel.

The shock absorbing member 140 is disposed in the internal space IS. The magnetic ring 150 is sleeved on the outer periphery of the second ring member 130. Specifically, the magnetic ring 150 is adhered to an outer wall surface OS of the second ring member 130, so that the magnetic ring 150 and the second ring member 130 are connected as a whole. In addition, the magnetic ring 150 is adhered to the outer periphery of the second ring member 130, which can avoid the concentricity deviation problem caused by the elastic deformation of the shock absorbing member 140 squeezing the magnetic ring 150, and can also avoid the damage of the magnetic ring caused by the vulcanization process of the shock absorbing member.

1 and 2 , the shock absorbing member 140 is attached to the first ring member 120 and the second ring member 130 to connect the first ring member 120 and the second ring member 130 into one body. Specifically, the shock absorbing member 140 is vulcanized rubber. In this embodiment, the rubber is placed in a high temperature and high pressure environment during the vulcanization process, so that the rubber becomes molten and is injected into the internal space IS between the second ring member 130 and the first ring member 120. After the rubber cools and solidifies, it adheres between the second ring member 130 and the first ring member 120. Since the rubber is a non-rigid material and has elasticity, it is suitable for achieving the effect of shock absorption and noise suppression during the rotation process of the second ring member 130 and the first ring member 120.

1 , the first ring 120 has a plurality of protrusions 122, which extend along a radial direction RD of the rotating shaft 110 toward an inner wall surface 131 of the second ring 130. In addition, the second ring 130 has a plurality of grooves 132, which are staggered with the plurality of protrusions 122 of the first ring 120. In this embodiment, the damping member 140 is filled between the first ring 120 and the second ring 130, and the plurality of grooves 132 are used to increase the surface area of the second ring 130 contacting the damping member 140, which is conducive to improving the adhesion between the first ring 120 and the second ring 130.

Referring to FIG. 2 , there is a gap G between each convex portion 122 of the first ring 120 and the inner wall surface 131 of the second ring 130. Since the fluidity of rubber in the vulcanization process is excellent, the damping member 140 is suitable for filling each gap G, so that the first ring 120 and the second ring 130 are not actually in contact. When the shaft 110 drives the first ring 120 and the second ring 130, it can ensure that the external vibration force is transmitted to the damping member 140 through the first ring 120 and will not be transmitted to the second ring 130, thereby suppressing the noise generated during the operation. In this embodiment, the size of each gap G is between 0.05 mm and 0.15 mm, ensuring that the rotor concentricity is controlled between 0.05 mm and 0.15 mm.

FIG3 is a schematic plan view of the rotor structure of the second embodiment of the present invention.

Fig. 4A is an exploded schematic diagram of the first ring, the second ring and the auxiliary sheet of the rotor structure of Fig. 3. Fig. 4B is a plan view of the first ring and the second ring of the rotor structure of Fig. 4A. Fig. 4C is a plan view of the auxiliary sheet of the rotor structure of Fig. 4A.

3 , 4A and 4B , the rotor structure 100A of the present embodiment is different from the rotor structure 100 of FIG. 1 in that the first ring 120a of the rotor structure 100A has a plurality of protrusions 122a extending along a radial direction RD of the rotating shaft 110a toward an inner wall surface 131a of the second ring 130a, and the second ring 130a has a plurality of grooves 132a respectively corresponding to the plurality of protrusions 122a of the first ring 120a.

With reference to FIG. 3 , FIG. 4A and FIG. 4C , the rotor structure 100A further includes an auxiliary sheet 160a, which is disposed on one side of the first ring 120a and the second ring 130a. The auxiliary sheet 160a has an outer ring portion 161a, an inner ring portion 162a and a plurality of connecting portions 163a. The outer ring portion 161a overlaps with the second ring 130a, and the inner ring portion 162a overlaps with the first ring 120a and is sleeved on the rotating shaft 110a. Specifically, the outer ring portion 161a and the inner ring portion 162a are connected to the first ring 120a and the second ring 130a by mold riveting.

Each connecting portion 163a is respectively connected to the outer ring portion 161a and the inner ring portion 162a. The multiple connecting portions 163a are located between the outer ring portion 161a and the inner ring portion 162a to form a plurality of through holes TH. The plurality of through holes TH are connected to the internal space IS. The shock absorbing member 140a is filled in the first ring member 120a and the second ring member 130a to cover and adhere to the multiple connecting portions 163a.

The smallest size of the multiple connecting parts 163a mentioned above is between 0.5mm and 2mm. The function of the connecting parts 163a is to suppress the concentricity deviation problem caused by the shock-absorbing component 140a after the vulcanization process. Since the rigidity of the connecting parts 163a is relatively low, the shock absorption and noise reduction functions of the shock-absorbing component 140a will not be affected.

Referring to FIG. 4A , in other embodiments, the auxiliary sheet 160a is suitable for being combined between the two rotor structures 100A, that is, the outer ring portion 161a overlaps with the two second rings 130a, and the inner ring portion 162a overlaps with the two first rings 120a, or the auxiliary sheet 160a is not limited to one, but multiple auxiliary sheets 160a are stacked on each other, which is suitable for motors with different torque requirements.

FIG5 is a schematic plan view of the first ring and the second ring of the rotor structure of the third embodiment of the present invention.

Referring to FIG. 5 , the rotor structure 100B of this embodiment is different from the rotor structure 100 of FIG. 1 in that the first ring 120b has a plurality of first protrusions 122b, and the plurality of first protrusions 122b extend along a radial direction RD of the rotation axis toward an inner wall surface 131b of the second ring 130b, and the second ring 130b has four second protrusions 132b, which are spaced apart from the corresponding plurality of first protrusions 122b of the first ring 120b. Specifically, the four second protrusions 132b are formed around the inner wall surface 131b of the second ring 130b, and any two adjacent second protrusions 132b have an angle of 90 degrees.

5 , there are gaps G between each second protrusion 132b of the second ring 130b and each corresponding first protrusion 122b of the first ring 120b. Since rubber has excellent fluidity during the vulcanization process, the shock absorber 140b is suitable for filling each gap G. In this embodiment, the size of each gap G is between 0.1 mm and 0.2 mm.

In summary, the rotor structure of the present invention has a first ring and a second ring to replace the existing one-piece rotor. In the manufacturing process, the damping member (rubber) is first filled between the first ring and the second ring through a vulcanization process, thereby connecting the first ring and the second ring into one body and the damping member has the effect of damping and anti-noise. Then, the magnetic ring is directly adhered to the outer periphery of the second ring to avoid the concentricity deviation problem caused by the contact between the damping member and the magnetic ring. It can also avoid the disadvantage of the existing rotor structure that the magnetic ring is damaged due to the deformation of the damping member (rubber) during the vulcanization process.

100, 100A, 100B: rotor structure 110, 110a: shaft 120, 120a, 120b: first ring 121: fastening hole 122, 122a: convex part 122b: first convex part 130, 130a, 130b: second ring 131, 131a: inner wall surface 132, 132a: groove 132b: second convex part 140, 140a, 140b: shock-absorbing part 150: magnet ring 160a: auxiliary sheet 161a: outer ring part 162a: inner ring part 163a: connecting part G: gap OS: outer wall surface IS: inner space RD: radial direction TH: Perforation

FIG. 1 is a schematic plan view of the rotor structure of the first embodiment of the present invention. FIG. 2 is a partially enlarged view of the rotor structure of FIG. 1. FIG. 3 is a schematic plan view of the rotor structure of the second embodiment of the present invention. FIG. 4A is a schematic diagram of the components of the first ring, the second ring and the auxiliary sheet of the rotor structure of FIG. 3. FIG. 4B is a schematic plan view of the first ring and the second ring of the rotor structure of FIG. 4A. FIG. 4C is a schematic plan view of the auxiliary sheet of the rotor structure of FIG. 4A. FIG. 5 is a schematic plan view of the first ring and the second ring of the rotor structure of the third embodiment of the present invention.

100: rotor structure 110: shaft 120: first ring 121: fastening hole 122: convex part 130: second ring 131: inner wall surface 132: groove 140: shock absorber 150: magnet ring OS: outer wall surface IS: inner space RD: radial direction

Claims (10)

A rotor structure includes: a rotating shaft; a first ring member, sleeved on the rotating shaft; a second ring member, surrounding the outer periphery of the first ring member to form an internal space; a damping member, arranged in the internal space; and a magnetic ring, sleeved on the second ring member, wherein the damping member is attached to the first ring member and the second ring member to connect the first ring member and the second ring member into one body, wherein the first ring member has a plurality of protrusions, which extend along a radial direction of the rotating shaft toward an inner wall surface of the second ring member, and the second ring member has a plurality of grooves, which are staggered with the protrusions of the first ring member. The rotor structure as described in claim 1, wherein there is a gap between each of the protrusions and the inner wall surface, and the shock absorbing member fills the gap. The rotor structure as described in claim 2, wherein the size of the gap is between 0.05mm and 0.15mm. The rotor structure as described in claim 1, wherein the magnetic ring is adhered to an outer wall surface of the second ring. The rotor structure as described in claim 1, wherein the shock absorbing member is vulcanized rubber. A rotor structure includes: a rotating shaft; a first ring member, sleeved on the rotating shaft; a second ring member, surrounding the outer periphery of the first ring member to form an internal space; a damping member, arranged in the internal space; and a magnetic ring, sleeved on the second ring member, wherein the damping member is attached to the first ring member and the second ring member to connect the first ring member and the second ring member into one body, wherein the first ring member has a plurality of protrusions, which extend along a radial direction of the rotating shaft toward an inner wall surface of the second ring member, and the second ring member has a plurality of grooves, which are respectively located on the protrusions of the first ring member. The rotor structure as described in claim 6 further includes an auxiliary sheet disposed on one side of the first ring and the second ring, the auxiliary sheet having an outer ring portion, an inner ring portion and a plurality of connecting portions, the outer ring portion overlaps the second ring, the inner ring portion overlaps the first ring and is sleeved with the rotating shaft, each connecting portion connects the outer ring portion and the inner ring portion respectively, and the shock absorbing member covers and adheres to the connecting portions. The rotor structure as described in claim 7, wherein the connection parts are formed between the outer ring and the inner ring to form a plurality of through holes, and the through holes are connected to the internal space. The rotor structure as described in claim 7, wherein the dimensions of the connecting parts are between 0.5 mm and 2 mm. A rotor structure includes: a rotating shaft; a first ring member, sleeved on the rotating shaft; a second ring member, surrounding the outer periphery of the first ring member to form an internal space; a damping member, arranged in the internal space; and a magnetic ring, sleeved on the second ring member, wherein the damping member is attached to the first ring member and the second ring member to connect the first ring member and the second ring member into one body, wherein the first ring member has a plurality of first protrusions, which extend along a radial direction of the rotating shaft toward an inner wall surface of the second ring member, and the second ring member has four second protrusions, which are respectively spaced from the corresponding first protrusions of the first ring member.

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