Transmission device, heat dissipation device, and motor

Abstract

The present disclosure provides a transmission device, comprising: an input shaft, an output shaft, an input permanent magnet, and an output permanent magnet. The input permanent magnet is fixed to the input shaft to pivot together with the input shaft, and has a plurality of input magnetic poles arranged circumferentially. The output permanent magnet is fixed to the output shaft to drive the output shaft to pivot, and has a plurality of output magnetic poles arranged circumferentially. The transmission device further comprises: a first driven permanent magnet magnetically coupled to the input permanent magnet, such that pivoting of the input permanent magnet drives the first driven permanent magnet to pivot; and a second driven permanent magnet coaxially pivoting together with the first driven permanent magnet, wherein the second driven permanent magnet is magnetically coupled to the output permanent magnet, such that pivoting of the second driven permanent magnet drives the output permanent magnet to pivot. One end of a rotating shaft of a motor serves as the input shaft or is connected to the input shaft, and the output shaft is connected to a fan to drive rotation of the fan, thereby directing airflow generated by the fan toward the main body of the motor.

Description

Transmission, heat dissipation device and motor Technical Field

[0001] The present disclosure relates to the field of motors, and in particular to a transmission device, a heat dissipation device including the transmission device, and a motor including the heat dissipation device. Background Art

[0002] The operation of a motor is the process of converting electrical energy into mechanical energy, which inevitably generates some losses. Most of these losses are converted into heat, causing the operating temperature of the motor windings, core, and other components to rise.

[0003] Motors typically use gas or liquid as a cooling medium, with air and water being the most common, referred to as air cooling or water cooling, respectively. Common air cooling methods include natural cooling (surface cooling), self-cooling (self-cooling), and forced fan cooling (forced cooling or independent fan cooling). Motors using natural cooling experience higher surface temperatures during operation, potentially affecting surrounding equipment and materials. Forced fan cooling uses an independently driven fan to ensure a constant air volume regardless of motor speed. While this provides better cooling than self-cooling, it also comes at a higher cost. Self-cooling uses the motor's own rotation to move air, with the air movement speed being related to the motor's speed. Some high-power industrial motors operate at low speeds but generate significant heat. Self-cooling often fails to meet these cooling requirements, while forced fan cooling increases costs.

[0004] Furthermore, existing cooling devices often have problems such as low transmission efficiency, poor stability, and high noise.

[0005] Therefore, a device with excellent performance is needed to improve the existing cooling and realize a new cooling method.

[0006] content

[0007] The purpose of the present disclosure is to at least solve the shortcomings of the prior art. The present disclosure proposes a transmission device, including a housing; an input shaft extending along a first axis and pivotally mounted to the housing; an output shaft pivotally mounted to the housing and extending along a second axis parallel to the first axis; an input permanent magnet fixed to the input shaft to pivot together with the input shaft, having a plurality of input magnetic poles arranged along a circumferential direction, with adjacent input magnetic poles having opposite polarities; an output permanent magnet fixed to the output shaft to drive the output shaft to pivot, having a plurality of output magnetic poles arranged along a circumferential direction, with adjacent output magnetic poles having opposite polarities; a first driven permanent magnet The first driven permanent magnet is a magnet that is pivotally mounted to the housing around a third axis parallel to the first axis, and has a plurality of first driven magnetic poles arranged along the circumferential direction, adjacent first driven magnetic poles have opposite polarities, and the first driven permanent magnet is magnetically coupled to the input permanent magnet so that the pivoting of the input permanent magnet drives the first driven permanent magnet to pivot; the second driven permanent magnet is coaxially pivoted with the first driven permanent magnet, and has a plurality of second driven magnetic poles arranged along the circumferential direction, adjacent second driven magnetic poles have opposite polarities, and the second driven permanent magnet is magnetically coupled to the output permanent magnet so that the pivoting of the second driven permanent magnet drives the output permanent magnet to pivot.

[0008] According to some embodiments of the present disclosure, the circumferential dimensions of each input magnetic pole and each first driven magnetic pole are set to correspond to each other, so that the time it takes for the input permanent magnet to rotate through the central angle corresponding to each input magnetic pole is equal to the time it takes for the first driven permanent magnet to rotate through the central angle corresponding to each first driven magnetic pole.

[0009] The circumferential dimensions of each output magnetic pole and each second driven magnetic pole are set to correspond one by one, so that the time it takes for the output permanent magnet to rotate through the central angle corresponding to each output magnetic pole is equal to the time it takes for the second driven permanent magnet to rotate through the central angle corresponding to each second driven magnetic pole.

[0010] According to some embodiments of the present disclosure, the number of input magnetic poles of the input permanent magnet is greater than the number of first driven magnetic poles of the first driven permanent magnet, the number of second driven magnetic poles of the second driven permanent magnet is greater than the number of first driven magnetic poles of the first driven permanent magnet, and the number of second driven magnetic poles of the second driven permanent magnet is greater than the number of output magnetic poles of the output permanent magnet.

[0011] According to some embodiments of the present disclosure, a distance between the first driven permanent magnet and the second driven permanent magnet along the third axis is greater than or equal to 2 mm.

[0012] According to some embodiments of the present disclosure, the first driven permanent magnet is aligned with the input permanent magnet in a direction perpendicular to the first axis, and the second driven permanent magnet is aligned with the output permanent magnet in a direction perpendicular to the first axis.

[0013] According to some embodiments of the present disclosure, the distance between the input permanent magnet and the first driven permanent magnet in the same plane perpendicular to the first axis is 0.2-1 mm, and the distance between the second driven permanent magnet and the output permanent magnet in the same plane perpendicular to the first axis is 0.2-1 mm.

[0014] According to some embodiments of the present disclosure, the input shaft and the output shaft are arranged concentrically.

[0015] According to some embodiments of the present disclosure, the input shaft and the output shaft have the same rotation direction.

[0016] According to some embodiments of the present disclosure, the transmission device further includes a connecting bearing, an inner ring of the connecting bearing being connected to the output shaft and one of the input shafts for common pivoting, and an outer ring of the connecting bearing being connected to the other of the output shaft and the input shaft for common pivoting.

[0017] According to some embodiments of the present disclosure, the transmission device further includes a third driven permanent magnet, which is pivotally mounted to the housing about a fourth axis parallel to the first axis, and has a plurality of third driven magnetic poles arranged circumferentially, with adjacent third driven magnetic poles having opposite polarities. The third driven permanent magnet is magnetically coupled to the input permanent magnet so that the pivoting of the input permanent magnet drives the third driven permanent magnet to pivot; a fourth driven permanent magnet, which pivots coaxially with the third driven permanent magnet, and has a plurality of fourth driven magnetic poles arranged circumferentially, with adjacent fourth driven magnetic poles having opposite polarities. The fourth driven permanent magnet is magnetically coupled to the output permanent magnet so that the pivoting of the fourth driven permanent magnet drives the output permanent magnet to pivot. The number of the third driven magnetic poles of the third driven permanent magnet is the same as the number of the first driven magnetic poles of the first driven permanent magnet, and the number of the fourth driven magnetic poles of the fourth driven permanent magnet is the same as the number of the second driven magnetic poles of the second driven permanent magnet.

[0018] According to some embodiments of the present disclosure, the transmission device further includes a fifth driven permanent magnet, which is pivotally mounted to the housing about a fifth axis parallel to the first axis, and has a plurality of fifth driven magnetic poles arranged circumferentially, with adjacent fifth driven magnetic poles having opposite polarities, and the fifth driven permanent magnet is magnetically coupled to the input permanent magnet so that the pivoting of the input permanent magnet drives the fifth driven permanent magnet to pivot; a sixth driven permanent magnet, which pivots coaxially with the fifth driven permanent magnet, and has a plurality of sixth driven magnetic poles arranged circumferentially, with adjacent sixth driven magnetic poles having opposite polarities, and the sixth driven permanent magnet is magnetically coupled to the output permanent magnet so that the pivoting of the sixth driven permanent magnet drives the output permanent magnet to pivot. Wherein, the number of the fifth driven magnetic poles of the fifth driven permanent magnet is the same as the number of the first driven magnetic poles of the first driven permanent magnet, and the number of the sixth driven magnetic poles of the sixth driven permanent magnet is the same as the number of the second driven magnetic poles of the second driven permanent magnet.

[0019] According to some embodiments of the present disclosure, the first driven permanent magnet, the third driven permanent magnet, and the fifth driven permanent magnet are identical, and the second driven permanent magnet, the fourth driven permanent magnet, and the sixth driven permanent magnet are identical.

[0020] According to some embodiments of the present disclosure, the first driven permanent magnet, the third driven permanent magnet, and the fifth driven permanent magnet are symmetrically arranged about the input axis, and the second driven permanent magnet, the fourth driven permanent magnet, and the sixth driven permanent magnet are symmetrically arranged about the output axis.

[0021] The present disclosure also proposes a heat dissipation device, wherein the heat dissipation device includes any of the aforementioned transmission devices, a fan is fixed to the output shaft, and the output shaft drives the fan to rotate so that the airflow generated by the fan is directed toward the input shaft.

[0022] The present disclosure also proposes a motor, comprising a motor body and a heat dissipation device according to the present disclosure, wherein the motor body comprises a motor rotating shaft, one end of the motor rotating shaft is used to transmit the mechanical energy generated by the motor, and the other end of the motor rotating shaft serves as an input shaft of the heat dissipation device or is connected to the input shaft of the heat dissipation device, so that the airflow generated by the fan is directed toward the motor body. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 shows a schematic cross-sectional view of a transmission device according to one embodiment of the present disclosure;

[0024] FIG2 shows a schematic perspective view of the transmission device according to FIG1 , wherein the housing is omitted;

[0025] FIG3 a shows a schematic diagram of an arrangement of magnetic coupling between an input permanent magnet and a first driven permanent magnet of a transmission device according to an embodiment of the present disclosure;

[0026] FIG3 b shows a schematic diagram of an arrangement of magnetic coupling between an output permanent magnet and a second driven permanent magnet of a transmission device according to an embodiment of the present disclosure;

[0027] FIG4 is a perspective schematic diagram of a transmission device according to another embodiment of the present disclosure, wherein the housing is omitted;

[0028] FIG5 is a perspective schematic diagram of a transmission device according to another embodiment of the present disclosure, wherein the housing is omitted;

[0029] FIG6 shows a schematic cross-sectional view of a motor including a transmission device according to the present disclosure;

[0030] FIG7 shows a schematic perspective view of the motor according to FIG6 ;

[0031] FIG8 a is a graph showing the relationship between wind speed and rotation speed ratio, FIG8 b is a graph showing the relationship between air volume and rotation speed ratio, and FIG8 c is a graph showing the relationship between wind pressure and rotation speed ratio.

[0032] Figure 1: Housing, 2: Input shaft, 21: Input permanent magnet, 211: Input magnetic pole, 3: Output shaft, 31: Output permanent magnet, 311: Output magnetic pole, 33: First stop, 34: Second stop, 41: First driven permanent magnet, 411: First driven magnetic pole, 42: Second driven permanent magnet, 421: Second driven magnetic pole, 5: Connecting bearing, 51: Connecting device, 61: Third driven permanent magnet, 611: Third driven magnetic pole, 62: Fourth driven permanent magnet, 621: Fourth driven magnetic pole, 71: Fifth driven permanent magnet, 711: Fifth driven magnetic pole, 72: Sixth driven permanent magnet, 721: Sixth driven magnetic pole, 8: Motor, 81: Fan, A1: First axis, A2: Second axis, A3: Third axis. DETAILED DESCRIPTION

[0033] In order to make the purpose, scheme and advantages of the technical solution of the present disclosure more clear, the technical solution of the embodiment of the present disclosure will be clearly and completely described below in conjunction with the drawings of the specific embodiments of the present disclosure. Unless otherwise specified, the terms used herein have the common meanings in the art. The same reference numerals in the drawings represent the same components.

[0034] In the description of this disclosure, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on the specific circumstances.

[0035] FIG1 is a schematic cross-sectional view of a transmission device according to one embodiment of the present disclosure; FIG2 is a schematic perspective view of the transmission device according to FIG1 , wherein the housing is omitted in FIG2 for clarity. In conjunction with FIG1 and FIG2 , the transmission device according to the present disclosure includes a housing 1, an input shaft 2, and an output shaft 3, wherein the input shaft 2 extends along a first axis A1, and the output shaft 3 extends along a second axis A2. The first axis A1 and the second axis A2 can be arranged parallel to each other, and in particular, can be arranged collinearly, such that the input shaft 2 and the output shaft 3 are arranged concentrically, as shown in FIG1 .

[0036] Both the input shaft 2 and the output shaft 3 are pivotally mounted relative to the housing 1. To transmit the pivoting of the input shaft 2 to the pivoting of the output shaft 3, this can be achieved through magnetic transmission. Thus, an input permanent magnet 21 is fixed to the input shaft 2, allowing the input permanent magnet 21 and the input shaft 2 to pivot together about a first axis A1; an output permanent magnet 31 is fixed to the output shaft 3, allowing the output permanent magnet 31 and the output shaft 3 to pivot together about a second axis A2. The input permanent magnet 21 has a plurality of input magnetic poles 211 arranged circumferentially, with adjacent input magnetic poles 211 having opposite polarity; the output permanent magnet 31 has a plurality of output magnetic poles 311 arranged circumferentially, with adjacent output magnetic poles 311 having opposite polarity, as shown in Figures 3a and 3b.

[0037] The transmission device is further provided with a first driven permanent magnet 41 and a second driven permanent magnet 42. The first driven permanent magnet 41 and the second driven permanent magnet 42 can be configured to pivot together about a third axis A3 parallel to the first axis A1, as shown in Figure 1. The first driven permanent magnet 41 has a plurality of first driven magnetic poles 411 arranged circumferentially, with adjacent first driven magnetic poles 411 having opposite polarity. The second driven permanent magnet 42 has a plurality of second driven magnetic poles 421 arranged circumferentially, with adjacent second driven magnetic poles 421 having opposite polarity, as shown in Figures 3a and 3b.

[0038] In order to realize magnetic transmission, the first driven permanent magnet 41 is magnetically coupled with the input permanent magnet 21, so that the pivoting of the input permanent magnet 21 drives the first driven permanent magnet 41 to pivot; the second driven permanent magnet 42 is magnetically coupled with the output permanent magnet 31, so that the pivoting of the second driven permanent magnet 42 drives the output permanent magnet 31 to pivot.

[0039] Regarding magnetic coupling, specifically, as shown in FIG3a , the first driven permanent magnet 41 and the input permanent magnet 21 are not in direct contact, but rather a gap exists between them. For example, the gap is between 0.2 and 1 mm in a plane perpendicular to the first axis A1. This arrangement generates a relatively large magnetic force, and therefore the torque transmitted through the magnetic coupling is also relatively large. A first driven magnetic pole 411 (shown as an S pole in the figure) and an input magnetic pole 211 (shown as an N pole in the figure) of opposite polarity are brought into proximity due to the magnetic force between them. When the input permanent magnet 21 rotates, for example, clockwise, the input magnetic pole 211 closest to the first driven magnetic pole 411 changes from the N pole in FIG3a to the S pole. Due to the magnetic force, the state of the first driven permanent magnet 41 shown in FIG3a cannot be maintained, and the first driven permanent magnet 41 will pivot, causing the first driven magnetic pole 411 closest to the input magnetic pole 211 to change to the N pole. Therefore, when the input permanent magnet 21 rotates, the first driven permanent magnet 41 will also rotate in a direction opposite to the rotation direction of the input permanent magnet, thereby realizing magnetic coupling in which the input permanent magnet 21 drives the first driven permanent magnet 41 to rotate.

[0040] Similarly, as shown in FIG3b, the second driven permanent magnet 42 and the output permanent magnet 31 are not in direct contact, but there is a gap between the two. For example, the gap is between 0.2-1 mm in the same plane perpendicular to the first axis A1. The magnetic force of this arrangement is relatively large, so the torque transmitted by magnetic coupling is also relatively large. A second driven magnetic pole 421 (shown as an N pole in the figure) with opposite polarity and an output magnetic pole 311 (shown as an S pole in the figure) are close to each other due to the magnetic force between them. When the second driven permanent magnet 42 rotates, for example, when rotating clockwise, the second driven magnetic pole 421 closest to the output magnetic pole 311 changes from the N pole in FIG3a to the S pole. Due to the effect of the magnetic force, the state of the output permanent magnet 31 shown in FIG3b will not be maintained, and the output permanent magnet 31 will pivot so that the output magnetic pole closest to the second driven magnetic pole 421 will become the N pole. Therefore, when the second driven permanent magnet 42 rotates, the output permanent magnet 31 will also rotate in a direction opposite to the rotation direction of the second driven permanent magnet 42 , thereby achieving magnetic coupling in which the second driven permanent magnet 42 drives the output permanent magnet 31 to rotate.

[0041] The input shaft 2 and the output shaft 3 can pivot in the same direction through the magnetic coupling between the first driven permanent magnet 41 and the input permanent magnet 21 and the magnetic coupling between the second driven permanent magnet 42 and the output permanent magnet 31 .

[0042] Furthermore, the transmission device may further include a connecting bearing 5, wherein the inner ring of the connecting bearing 5 is connected to pivot with one of the output shaft 3 and the input shaft 2 for joint rotation, and the outer ring of the connecting bearing 5 is connected to pivot with the other of the output shaft 3 and the input shaft 2 for joint rotation. In Figure 1 , the inner ring of the connecting bearing 5 pivots with the output shaft 3, while the outer ring of the connecting bearing 5 pivots with the input shaft 2 for joint rotation. For example, in Figure 1 , the outer ring of the connecting bearing 5 is connected to the input shaft 2 via a connecting device 51 to achieve joint rotation. With this arrangement, the connecting bearing 5 connects both the input shaft 2 and the output shaft 3, eliminating the need for a separate bearing mounted on the input shaft and saving space. Furthermore, the outer ring of the connecting bearing 5 rotates at the same speed as the input shaft 2, while the inner ring of the connecting bearing 5 rotates at the same speed as the output shaft 3, and the input shaft 2 and the output shaft 3 rotate in the same direction. Because the input shaft 2 and the output shaft 3 rotate in the same direction, the speed difference between the inner and outer rings of the connecting bearing 5 is smaller than in conventional designs where only the inner ring rotates while the outer ring remains stationary. This reduces the impact on the bearing life and increases the life of the connecting bearing 5.

[0043] It is worth noting that Figures 1 to 3b show an arrangement in which the first driven permanent magnet 41 and the input permanent magnet 21 are aligned in a direction perpendicular to the first axis A1, and the second driven permanent magnet 42 and the output permanent magnet 31 are aligned in a direction perpendicular to the first axis A1. The magnetic force of this arrangement is large, and therefore the torque transmitted through magnetic coupling is also large. However, the transmission device disclosed in the present invention also includes other arrangements. For example, the first driven permanent magnet 41 and the input permanent magnet 21 can be arranged in an overlapping manner along the direction of the first axis A1, that is, the first driven magnetic pole 411 and the input magnetic pole 211 are aligned in the direction of the first axis A1. This arrangement can also achieve magnetic transmission. Similarly, the second driven permanent magnet 42 and the output permanent magnet 31 can also be arranged in an overlapping manner along the direction of the first axis A1, that is, the second driven magnetic pole 421 and the output magnetic pole 311 are aligned in the direction of the first axis A1.

[0044] Furthermore, as shown in FIG3a, the size of each input magnetic pole 211 can be equal, and the size of each first driven magnetic pole 411 can also be equal. In particular, the circumferential size of each input magnetic pole 211 and each first driven magnetic pole 411 is set to correspond one by one, so that the time for the input permanent magnet 21 to rotate through the central angle corresponding to each input magnetic pole 211 is equal to the time for the first driven permanent magnet 41 to rotate through the central angle corresponding to each first driven magnetic pole 411. In the embodiment corresponding to FIG3a, it can also be shown that the peripheral arc lengths of each input magnetic pole 211 and each first driven magnetic pole 411 are equal or approximately equal. It should be understood that due to the clearance fit between the input magnetic pole 211 and the first driven magnetic pole 411, the peripheral arc lengths of the two are not necessarily completely equal. Thus, it can be ensured that during the transmission process, the input magnetic pole 211 and the first driven magnetic pole 411 of opposite polarity correspond to each other one by one, avoiding transmission jitter caused by NS pole mismatch, resulting in increased transmission noise and reduced transmission efficiency.

[0045] Similarly, this arrangement can also be applied to the second driven magnetic pole 421 and the output magnetic pole 311. The circumferential dimensions of each output magnetic pole 311 and each second driven magnetic pole 421 are set to correspond to each other, so that the time it takes for the output permanent magnet 31 to rotate through the central angle corresponding to each output magnetic pole 311 is equal to the time it takes for the second driven permanent magnet 42 to rotate through the central angle corresponding to each second driven magnetic pole 421. In the embodiment corresponding to FIG3 b , it can also be shown that the outer arc lengths of each output magnetic pole 311 and each second driven magnetic pole 421 are equal or approximately equal.

[0046] However, if the distance between the first and second driven permanent magnets 41, 42 is too close—equivalent to the distance between the input permanent magnet 21 and the second driven permanent magnet 42—the second driven permanent magnet 42 will be affected by the magnetic field of the input permanent magnet 21, disrupting the rotational balance of the second driven permanent magnet 42, increasing noise during operation and reducing transmission efficiency. To avoid this, the distance between the first and second driven permanent magnets 41, 42 along the first axis A1 should be greater than 2 mm.

[0047] To adjust the output shaft speed, the number of input magnetic poles 211, output magnetic poles 311, first driven magnetic poles 411, and second driven magnetic poles 421 can also be set. For ease of explanation, assume the input shaft 2 speed is s, the input permanent magnet 21 has n poles, the first driven permanent magnet 41 has x poles, the second driven permanent magnet 42 has y poles, the output permanent magnet 31 has z poles, and the output shaft speed is t. If the input permanent magnet 21 has the same speed as the input shaft 2, which is s, then the speeds of the first and second driven permanent magnets 41 and 42 are s × n / x, and the output shaft 3 has the same speed as the output permanent magnet 31, which is t = s × n / x × y / z.

[0048] Furthermore, for example, as shown in Figures 3a and 3b, the number of input magnetic poles 211 can be greater than the number of first driven magnetic poles 411, and the number of second driven magnetic poles 421 can be greater than the number of output magnetic poles 311. Thus, the rotational speed of the output shaft 3 is greater than the rotational speed of the input shaft 2. Specifically, for example, as shown in Figures 3a and 3b, when the number of input permanent magnet poles is 10, the number of driven permanent magnet 1 poles is 8, the number of driven permanent magnet 2 poles is 10, and the number of output permanent magnet poles is 8, the speed of the output shaft 3 is 10 / 8 × 10 / 8 = 1.5625 times the speed of the input shaft 2. Thus, by adjusting the number of magnetic poles, the desired output shaft rotational speed can be achieved, which provides support for the speed setting of the fan on the output shaft.

[0049] According to the present disclosure, the heat dissipation method is improved by utilizing the above-mentioned transmission device. Specifically, a heat dissipation device including the transmission device and a motor 8 including the heat dissipation device are also proposed, as shown in Figures 6 and 7. Among them, the output shaft 3 of the transmission device can be fixedly connected to the fan 81, and the airflow generated by the fan 81 can be along the output shaft 3 toward the direction of the input shaft 2, and in particular, the airflow can be toward the motor 8 to achieve heat dissipation of the motor 8. The input shaft 2 can be, for example, the motor rotating shaft 82 of the motor 8 or connected to the motor rotating shaft 82, wherein the motor rotating shaft 82 is the main shaft for transmitting the mechanical energy generated by the motor, as shown in Figures 7 and 8. Thus, by utilizing the transmission device according to the present disclosure, the rotation of the motor can be transmitted to the output shaft 3 connected to the fan 8. In particular, the low speed of the motor can be made to rotate at a high speed after passing through the transmission device with an adjustable number of magnetic poles.

[0050] Figure 8a shows a graph of the relationship between wind speed and speed ratio, Figure 8b shows a graph of the relationship between air volume and speed ratio, and Figure 8c shows a graph of the relationship between wind pressure and speed ratio. Figures 8a-8c are all measured for a heat dissipation device according to an embodiment of the present disclosure and are provided for illustration purposes only. The speed ratio refers to the ratio of the speeds of the output shaft to the input shaft. It can be seen that wind speed and air volume are linearly positively correlated with the speed ratio, while air volume and speed ratio are nonlinearly parabolically positively correlated. Increasing the speed ratio significantly increases the heat dissipation effect.

[0051] The transmission and heat dissipation device disclosed herein possess all the advantages of magnetic transmission, including contactless transmission, which eliminates contact friction, resulting in more reliable stability and reduced maintenance costs and cycles; avoids vibration and vibration generated by mechanical contact, resulting in excellent noise and vibration performance, making it an energy-saving and environmentally friendly transmission method; and boasts high transmission efficiency, significantly improving energy efficiency. These advantages are particularly beneficial for heat dissipation, particularly in motor heat dissipation applications, providing long-term, stable heat dissipation, reducing noise caused solely by heat dissipation, and lowering the energy required for heat dissipation.

[0052] In addition, the transmission device and heat dissipation device according to the present invention are particularly suitable for heat dissipation of high-power, low-speed motors. Forced fan cooling will increase costs, and self-fan cooling will have a poor cooling effect. When the transmission device according to the present invention is installed on the motor, a high-speed cooling fan can be used when the motor is at a low speed, thereby improving the heat dissipation effect of the motor. Moreover, this arrangement is an improvement on self-fan cooling, and reduces costs compared to independent fan cooling.

[0053] Furthermore, the present disclosure also provides other embodiments. For example, as shown in FIG4 , the transmission device of the present disclosure further includes a third driven permanent magnet 61 and a fourth driven permanent magnet 62. The third driven permanent magnet 61 and the fourth driven permanent magnet 62 can be configured to pivot together about a fourth axis (not shown) parallel to the first axis A1. The third driven permanent magnet 61 has a plurality of third driven magnetic poles (not shown) arranged circumferentially, with adjacent third driven magnetic poles having opposite polarity. The fourth driven permanent magnet 62 has a plurality of fourth driven magnetic poles (not shown) arranged circumferentially, with adjacent fourth driven magnetic poles having opposite polarity. The third driven permanent magnet 61 is magnetically coupled to the input permanent magnet 21, such that the pivoting of the input permanent magnet 21 drives the third driven permanent magnet 61 to pivot. The fourth driven permanent magnet 62 is magnetically coupled to the output permanent magnet 31, such that the pivoting of the fourth driven permanent magnet 62 drives the output permanent magnet 31 to pivot.

[0054] In particular, the number of third driven magnetic poles of the third driven permanent magnet 61 is the same as the number of first driven magnetic poles 411 of the first driven permanent magnet 41, and the number of fourth driven magnetic poles of the fourth driven permanent magnet 62 is the same as the number of second driven magnetic poles 421 of the second driven permanent magnet 42. Thus, through the simultaneous action of the first and second driven permanent magnets 41, 42, and the third and fourth driven permanent magnets 61, 62, the total torque applied to the output shaft 3 can be increased, allowing the output shaft 3 to drive a larger fan to rotate, thereby achieving a better heat dissipation effect.

[0055] More preferably, the structure of the third driven permanent magnet 61 is exactly the same as that of the first driven permanent magnet 41, and the structure and arrangement of the sixth driven permanent magnet 62 are exactly the same as those of the second driven permanent magnet 42, especially they are arranged symmetrically about the output shaft 3, so that the magnetic force of the sixth driven permanent magnet 62 and the second driven permanent magnet 42 on the output shaft 3 is exactly the same, so that the rotation of the output shaft 3 is more stable and the force is more uniform.

[0056] In addition, according to another embodiment of the present disclosure, the transmission device according to the present disclosure may further include a fifth driven permanent magnet 71 and a sixth driven permanent magnet 72 on the basis of the third driven permanent magnet 61 and the fourth driven permanent magnet 62. As shown in FIG5 , the fifth driven permanent magnet 71 and the sixth driven permanent magnet 72 may be configured to pivot together about a fifth axis (not shown) parallel to the first axis A1. The fifth driven permanent magnet 71 has a plurality of fifth driven magnetic poles (not shown) arranged circumferentially, with adjacent fifth driven magnetic poles having opposite polarities; the sixth driven permanent magnet 72 has a plurality of sixth driven magnetic poles (not shown) arranged circumferentially, with adjacent sixth driven magnetic poles having opposite polarities. The fifth driven permanent magnet 71 is magnetically coupled to the input permanent magnet 21, so that the pivoting of the input permanent magnet 21 drives the fifth driven permanent magnet 71 to pivot; the sixth driven permanent magnet 72 is magnetically coupled to the output permanent magnet 31, so that the pivoting of the sixth driven permanent magnet 72 drives the output permanent magnet 31 to pivot.

[0057] In particular, the number of fifth driven magnetic poles of the fifth driven permanent magnet 71 is the same as the number of first driven magnetic poles 411 of the first driven permanent magnet 41, and the number of sixth driven magnetic poles of the sixth driven permanent magnet 72 is the same as the number of second driven magnetic poles 421 of the second driven permanent magnet 42. Thus, through the simultaneous action of the first and second driven permanent magnets 41 and 42, the third and fourth driven permanent magnets 61 and 62, and the fifth and sixth driven permanent magnets 71 and 72, the total torque applied to the output shaft 3 can be increased, allowing the output shaft 3 to drive a larger fan to rotate, thereby achieving a better heat dissipation effect.

[0058] More preferably, the structure of the fifth driven permanent magnet 71 is exactly the same as that of the first driven permanent magnet 41 and the third driven permanent magnet 61, and the structure and arrangement of the sixth driven permanent magnet 72 are exactly the same as those of the second driven permanent magnet 42 and the fourth driven permanent magnet 62, especially they are arranged symmetrically about the output shaft 3, as shown in Figure 5, so that the magnetic forces of the sixth driven permanent magnet 72, the fourth driven permanent magnet 62 and the second driven permanent magnet 42 on the output shaft 3 are exactly the same, so that the rotation of the output shaft 3 is more stable and the force is more uniform.

[0059] Furthermore, it is conceivable that the transmission device according to the present disclosure may further include more driven permanent magnets, such as a seventh driven permanent magnet (not shown), an eighth driven permanent magnet (not shown), a ninth driven permanent magnet (not shown), and a tenth driven permanent magnet (not shown), etc. The structure and arrangement of these magnets may also refer to the first driven permanent magnet 41 and the second driven permanent magnet 42 described above, so as to drive a larger fan and thereby achieve a better heat dissipation effect.

[0060] It should be understood that the above description is intended to illustrate rather than to limit. For example, the above embodiments (and / or aspects thereof) may be used in combination with each other. In addition, without departing from the scope of the present disclosure, many modifications may be made to adapt specific circumstances or materials to the teachings of the present disclosure. The functions or performances of the various elements or modules described herein are intended to be illustrative only and are by no means restrictive, but are merely exemplary embodiments. After reading the above description, many other embodiments and modifications within the spirit and scope of the claims will be apparent to those skilled in the art. Therefore, the scope of the present disclosure should be determined with reference to the appended claims and the full scope of equivalents given by these claims.

[0061] In the following claims, the terms “including” and “in which” are used as the plain-English equivalents of the respective terms “comprising” and “wherein.” Moreover, in the following claims, the terms “first,” “second,” and “third,” etc. are used merely as labels and are not intended to impose numerical requirements on their objects.

Claims

1. A transmission device comprising: case, an input shaft extending along a first axis and pivotally mounted to the housing, an output shaft pivotally mounted to the housing and extending along a second axis parallel to the first axis, an input permanent magnet fixed to the input shaft so as to pivot together with the input shaft, having a plurality of input magnetic poles arranged in a circumferential direction, adjacent input magnetic poles having opposite polarities, The output permanent magnet is fixed to the output shaft to drive the output shaft to pivot, and has a plurality of output magnetic poles arranged along the circumference, and adjacent output magnetic poles have opposite polarities. a first driven permanent magnet, pivotally mounted to the housing about a third axis parallel to the first axis, having a plurality of first driven magnetic poles arranged circumferentially, adjacent first driven magnetic poles having opposite polarities, the first driven permanent magnet being magnetically coupled to the input permanent magnet such that pivoting of the input permanent magnet can drive the first driven permanent magnet to pivot; The second driven permanent magnet pivots coaxially with the first driven permanent magnet, has a plurality of second driven magnetic poles arranged along the circumference, and adjacent second driven magnetic poles have opposite polarities. The second driven permanent magnet is magnetically coupled with the output permanent magnet, so that the pivoting of the second driven permanent magnet can drive the output permanent magnet to pivot.

2. The transmission device according to claim 1, wherein: The circumferential dimensions of each input magnetic pole and each first driven magnetic pole are set to correspond to each other, so that the time it takes for the input permanent magnet to rotate through the central angle corresponding to each input magnetic pole is equal to the time it takes for the first driven permanent magnet to rotate through the central angle corresponding to each first driven magnetic pole. The circumferential dimensions of each output magnetic pole and each second driven magnetic pole are set to correspond one by one, so that the time it takes for the output permanent magnet to rotate through the central angle corresponding to each output magnetic pole is equal to the time it takes for the second driven permanent magnet to rotate through the central angle corresponding to each second driven magnetic pole.

3. The transmission device according to claim 2, wherein: The number of input magnetic poles of the input permanent magnet is greater than the number of first driven magnetic poles of the first driven permanent magnet, the number of second driven magnetic poles of the second driven permanent magnet is greater than the number of first driven magnetic poles of the first driven permanent magnet, and the number of second driven magnetic poles of the second driven permanent magnet is greater than the number of output magnetic poles of the output permanent magnet.

4. The transmission device according to any one of claims 1 to 3, wherein: A distance between the first driven permanent magnet and the second driven permanent magnet along the third axis is greater than or equal to 2 mm.

5. The transmission device according to any one of claims 1 to 3, wherein: The first driven permanent magnet is aligned with the input permanent magnet in a direction perpendicular to the first axis, and the second driven permanent magnet is aligned with the output permanent magnet in a direction perpendicular to the first axis.

6. The transmission device according to claim 5, wherein: The distance between the input permanent magnet and the first driven permanent magnet in the same plane perpendicular to the first axis is 0.2-1 mm, and the distance between the second driven permanent magnet and the output permanent magnet in the same plane perpendicular to the first axis is 0.2-1 mm.

7. The transmission device according to claim 6, wherein: The input shaft is arranged concentrically with the output shaft.

8. The transmission device according to claim 7, wherein: The input shaft and the output shaft have the same direction of rotation.

9. The transmission device according to claim 8, wherein: The transmission device further includes a connecting bearing, an inner ring of the connecting bearing being connected to one of the output shaft and the input shaft for common pivoting, and an outer ring of the connecting bearing being connected to the other of the output shaft and the input shaft for common pivoting.

10. The transmission device according to claim 7, wherein: The transmission device further comprises: a third driven permanent magnet, pivotally mounted to the housing about a fourth axis parallel to the first axis, having a plurality of third driven magnetic poles arranged circumferentially, with adjacent third driven magnetic poles having opposite polarities, the third driven permanent magnet being magnetically coupled to the input permanent magnet such that pivoting of the input permanent magnet drives the third driven permanent magnet to pivot; a fourth driven permanent magnet, coaxially pivoting with the third driven permanent magnet, having a plurality of fourth driven magnetic poles arranged circumferentially, adjacent fourth driven magnetic poles having opposite polarities, the fourth driven permanent magnet being magnetically coupled to the output permanent magnet such that the pivoting of the fourth driven permanent magnet drives the pivoting of the output permanent magnet; The number of the third driven magnetic poles of the third driven permanent magnet is the same as the number of the first driven magnetic poles of the first driven permanent magnet, and the number of the fourth driven magnetic poles of the fourth driven permanent magnet is the same as the number of the second driven magnetic poles of the second driven permanent magnet.

11. The transmission device according to claim 10, wherein: The transmission device further comprises: a fifth driven permanent magnet pivotally mounted to the housing about a fifth axis parallel to the first axis, having a plurality of fifth driven magnetic poles arranged circumferentially, adjacent fifth driven magnetic poles having opposite polarities, the fifth driven permanent magnet being magnetically coupled to the input permanent magnet such that pivoting of the input permanent magnet drives the fifth driven permanent magnet to pivot. a sixth driven permanent magnet, coaxially pivoting with the fifth driven permanent magnet, having a plurality of sixth driven magnetic poles arranged circumferentially, adjacent sixth driven magnetic poles having opposite polarities, the sixth driven permanent magnet being magnetically coupled to the output permanent magnet such that the pivoting of the sixth driven permanent magnet drives the output permanent magnet to pivot; The number of the fifth driven magnetic poles of the fifth driven permanent magnet is the same as the number of the first driven magnetic poles of the first driven permanent magnet, and the number of the sixth driven magnetic poles of the sixth driven permanent magnet is the same as the number of the second driven magnetic poles of the second driven permanent magnet.

12. The transmission device according to claim 11, wherein: The first driven permanent magnet, the third driven permanent magnet, and the fifth driven permanent magnet are identical, and the second driven permanent magnet, the fourth driven permanent magnet, and the sixth driven permanent magnet are identical.

13. The transmission device according to claim 12, wherein: The first driven permanent magnet, the third driven permanent magnet, and the fifth driven permanent magnet are symmetrically arranged about the input axis, and the second driven permanent magnet, the fourth driven permanent magnet, and the sixth driven permanent magnet are symmetrically arranged about the output axis.

14. A heat dissipation device, wherein: The heat dissipation device comprises the transmission device according to any one of the preceding claims, wherein a fan is fixed to the output shaft, and the output shaft drives the fan to rotate so that the airflow generated by the fan is directed toward the input shaft.

15. A motor comprising a motor body and the heat dissipation device according to claim 14, wherein: The motor body includes a motor rotating shaft, one end of which is used to transmit the mechanical energy generated by the motor, and the other end of the motor rotating shaft serves as the input shaft of the heat dissipation device or is connected to the input shaft of the heat dissipation device, so that the airflow generated by the fan is directed toward the motor body.

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