Transmission device, heat dissipation device and motor

Abstract

The utility model provides a transmission device which comprises an input shaft, an output shaft, an input permanent magnet and an output permanent magnet. An input permanent magnet fixed to the input shaft to pivot together with the input shaft and having a plurality of input magnetic poles arranged in a circumferential direction; an 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 in a circumferential direction. The transmission device further comprises a first driven permanent magnet and a second driven permanent magnet, the first driven permanent magnet is magnetically coupled with the input permanent magnet, so that pivoting of the input permanent magnet drives the first driven permanent magnet to pivot, the second driven permanent magnet and the first driven permanent magnet coaxially and jointly pivot, and the second driven permanent magnet is magnetically coupled with the output permanent magnet. And the pivoting of the second driven permanent magnet drives the output permanent magnet to pivot. One end of the motor rotating shaft serves as an input shaft or is connected to the input shaft, and the output shaft is connected to the fan to drive the fan to rotate, so that airflow generated by the fan faces the motor body.

Description

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 process of the motor is the process of mutual conversion between electrical energy and mechanical energy, and some losses will inevitably occur in this process. Most of these losses will be converted into heat energy, which will cause the operating temperature of the motor windings, cores and other components to rise.

[0003] Motors usually use gas or liquid as cooling media, the most common ones are air and water, which are called air cooling or water cooling respectively. Common cooling methods for air cooling are natural cooling (surface cooling), self-fan cooling (self-cooling), and forced fan cooling (forced cooling or independent fan cooling). The surface temperature of the motor using natural cooling is high during operation, which may affect the surrounding equipment and materials. Forced fan cooling contains an independently driven fan to ensure the constant air volume regardless of the motor speed. Its cooling effect is better than self-fan cooling, but the cost is relatively high. Self-fan cooling is to move air through the rotation of the motor itself to achieve cooling. The speed of air movement is related to the motor speed. The operating speed of some high-power industrial motors is not high, but the heat generation is large. Self-fan cooling often cannot meet the heat dissipation requirements, and forced fan cooling increases the cost.

[0004] In addition, 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. Utility Model Content

[0006] The purpose of the present disclosure is to at least solve the shortcomings existing in the prior art. The present disclosure provides a transmission device, including an input shaft extending along a first axis and pivotable around the first axis; an output shaft extending along a second axis parallel to the first axis and pivotable around the second 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 the circumferential direction, and adjacent input magnetic poles have 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 the circumferential direction, and adjacent output magnetic poles have opposite polarities; A driven permanent magnet assembly, which can pivot about a third axis parallel to the first axis, has a plurality of first driven magnetic poles and a plurality of second driven magnetic poles arranged in a circumferential direction, the plurality of first driven magnetic poles and the plurality of second driven magnetic poles are spaced apart along the third axis, the adjacent first driven magnetic poles have opposite polarities, the adjacent second driven magnetic poles have opposite polarities, the plurality of first driven magnetic poles are magnetically coupled with the input permanent magnet and the plurality of second driven magnetic poles are magnetically coupled with the output permanent magnet, so that the pivoting of the input permanent magnet is transmitted to the output permanent magnet through the driven permanent magnet assembly. The number of the driven permanent magnet assemblies is one or more.

[0007] 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 one by one, so that the time for the input permanent magnet to rotate through the central angle corresponding to each input magnetic pole is equal to the time for the first driven permanent magnet to rotate through the central angle corresponding to each first driven magnetic pole.

[0008] 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.

[0009] 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 the second driven magnetic poles of the second driven permanent magnet is greater than the number of the first driven magnetic poles of the first driven permanent magnet, and the number of the second driven magnetic poles of the second driven permanent magnet is greater than the number of output magnetic poles of the output permanent magnet.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] According to some embodiments of the present disclosure, the input shaft is arranged concentrically with the output shaft.

[0014] According to some embodiments of the present disclosure, the input shaft and the output shaft have the same direction of rotation.

[0015] According to some embodiments of the present disclosure, the transmission device also includes a connecting bearing, an inner ring of the connecting bearing is connected to the output shaft and one of the input shafts for common pivoting, and an outer ring of the connecting bearing is connected to the other of the output shaft and the input shaft for common pivoting.

[0016] According to some embodiments of the present disclosure, the number of the driven permanent magnet assemblies is two or three.

[0017] According to some embodiments of the present disclosure, the driven permanent magnet assembly is arranged symmetrically about the output axis.

[0018] The present disclosure also proposes a heat dissipation device, wherein the heat dissipation device includes any of the aforementioned transmission devices, the output shaft is connected to a fan, and the output shaft drives the fan to rotate so that the airflow generated by the fan is directed toward the input shaft.

[0019] 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

[0020] Figure 1 A cross-sectional schematic diagram showing a transmission device according to an embodiment of the present disclosure;

[0021] Figure 2 Show according to Figure 1 A three-dimensional schematic diagram of a transmission device, wherein the housing is omitted;

[0022] Figure 3a A schematic diagram showing 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;

[0023] Figure 3b A schematic diagram showing 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;

[0024] Figure 4 A perspective schematic diagram showing a transmission device according to another embodiment of the present disclosure, wherein the housing is omitted;

[0025] Figure 5 A perspective schematic diagram of a transmission device according to another embodiment of the present disclosure is shown, wherein the housing is omitted;

[0026] Figure 6 A schematic cross-sectional view of an electric machine including a transmission device according to the present disclosure is shown;

[0027] Figure 7 Show according to Figure 6 A three-dimensional schematic diagram of a motor;

[0028] Figure 8a A graph showing the relationship between wind speed and rotation speed ratio, Figure 8b A graph showing the relationship between air volume and rotation speed ratio, Figure 8c A graph showing the relationship between wind pressure and rotation speed ratio.

[0029] Reference numerals

[0030] 1 housing,

[0031] 2 input shafts, 21 input permanent magnets, 211 input poles

[0032] 3 output shaft, 31 output permanent magnet, 311 output magnetic pole, 33 first stop portion, 34 second stop portion, 4 driven permanent magnet assembly, 41 first driven permanent magnet, 411 first driven magnetic pole, 42 second driven permanent magnet, 421 second driven magnetic pole,

[0033] 5 connecting bearing, 51 connecting device

[0034] 8 motors, 81 fans

[0035] A1 is the first axis, A2 is the second axis, A3 is the third axis DETAILED DESCRIPTION

[0036] In order to make the purpose, scheme and advantages of the technical solution of the present disclosure clearer, the technical solution of the embodiment of the present disclosure will be clearly and completely described in conjunction with the drawings of the specific embodiments of the present disclosure. Unless otherwise specified, the terms used herein have the usual meanings in the art. The same reference numerals in the drawings represent the same components.

[0037] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0038] Figure 1 A cross-sectional schematic diagram showing a transmission device according to an embodiment of the present disclosure; Figure 2 Show according to Figure 1 For the sake of clarity, Figure 2 The housing is omitted. Figure 1 and Figure 2 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, the two can be arranged to be collinear, so that the input shaft 2 and the output shaft 3 are arranged concentrically, as shown in FIG. Figure 1 shown.

[0039] Both the input shaft 2 and the output shaft 3 can be pivotally mounted to the housing 1 relative to the housing 1. In order to transmit the pivoting of the input shaft 2 to the pivoting of the output shaft 3, it can be achieved by magnetic transmission. Therefore, an input permanent magnet 21 is fixed on the input shaft 2, so that the input permanent magnet 21 and the input shaft 2 pivot together around the first axis A1; an output permanent magnet 31 is fixed on the output shaft 3, so that the output permanent magnet 31 and the output shaft 3 pivot together around the second axis A2. The input permanent magnet 21 has a plurality of input magnetic poles 211 arranged along the circumferential direction, and the adjacent input magnetic poles 211 have opposite polarities; the output permanent magnet 31 has a plurality of output magnetic poles 311 arranged along the circumferential direction, and the adjacent output magnetic poles 311 have opposite polarities, such as Figure 3a and 3b shown.

[0040] In addition, the transmission device is further provided with a driven permanent magnet assembly 4 including 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 arranged to pivot together around a third axis A3 parallel to the first axis A1, such as Figure 1 The first driven permanent magnet 41 has a plurality of first driven magnetic poles 411 arranged along the circumference, and the adjacent first driven magnetic poles 411 have opposite polarities; the second driven permanent magnet 42 has a plurality of second driven magnetic poles 421 arranged along the circumference, and the adjacent second driven magnetic poles 421 have opposite polarities, as shown in FIG. Figure 3a and 3b shown.

[0041] 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.

[0042] For magnetic coupling, specifically, Figure 3a As shown, the first driven permanent magnet 41 and the input permanent magnet 21 are not in direct contact, but there is a gap between them, for example, the gap is between 0.2-1mm in a plane perpendicular to the first axis A1. The magnetic force of this arrangement is relatively large, so the torque transmitted through 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) with opposite polarity are close to each other 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 is moved by Figure 3a The N pole in the magnet changes to the S pole. Due to the magnetic force, Figure 3a The state of the first driven permanent magnet 41 shown in the figure cannot be maintained, and the first driven permanent magnet 41 will pivot, so that the first driven magnetic pole 411 closest to the input magnetic pole 211 will become the N pole. Therefore, when the input permanent magnet 21 rotates, the first driven permanent magnet 41 will also rotate, and the direction is opposite to the rotation direction of the input permanent magnet, realizing the magnetic coupling of the input permanent magnet 21 driving the first driven permanent magnet 41 to rotate.

[0043] Similarly, if Figure 3b As shown, the second driven permanent magnet 42 and the output permanent magnet 31 are also not in direct contact, but there is a gap between the two. For example, the gap is between 0.2-1mm in the same plane perpendicular to the first axis A1. The magnetic force of this arrangement is relatively large, so the torque transmitted through 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, clockwise, the second driven magnetic pole 421 closest to the output magnetic pole 311 is moved by Figure 3a The N pole in the magnet changes to the S pole. Due to the magnetic force, Figure 3bThe state of the output permanent magnet 31 shown in the figure cannot 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, and the direction is opposite to the rotation direction of the second driven permanent magnet 42, realizing the magnetic coupling of the second driven permanent magnet 42 driving the output permanent magnet 31 to rotate.

[0044] 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 .

[0045] Furthermore, the transmission device may further include a connecting bearing 5, the inner ring of the connecting bearing 5 is connected to one of the output shaft 3 and the input shaft 2 for common pivoting, and the outer ring of the connecting bearing 5 is connected to the other of the output shaft 3 and the input shaft 2 for common pivoting. Figure 1 In the embodiment, the inner ring of the connecting bearing 5 pivots together with the output shaft 3, and the outer ring of the connecting bearing 5 pivots together with the input shaft 2. Figure 1 The outer ring of the connecting bearing 5 is connected to the input shaft 2 through the connecting device 51 to achieve common pivoting. According to this configuration, the connecting bearing 5 is connected to the input shaft 2 and the output shaft 3 at the same time, which can save a bearing installed separately on the input shaft and save space. In addition, the outer ring of the connecting bearing 5 has the same rotation speed as the input shaft 2, the inner ring of the connecting bearing 5 has the same rotation speed as the output shaft 3, and the input shaft 2 and the output shaft 3 have the same rotation direction. Since 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 that of the conventional design in which only the inner ring rotates and the outer ring does not move, so the impact on the life of the bearing is relatively small, which can increase the life of the connecting bearing 5.

[0046] It is worth noting that Figures 1 to 3b What is shown in the figure is that the first driven permanent magnet 41 is aligned with the input permanent magnet 21 in a direction perpendicular to the first axis A1, and the second driven permanent magnet 42 is aligned with the output permanent magnet 31 in a direction perpendicular to the first axis A1. The magnetic force of this arrangement is relatively large, so the torque transmitted through magnetic coupling is also relatively 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 overlappingly in 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, and this arrangement can also realize magnetic transmission. Similarly, the second driven permanent magnet 42 and the output permanent magnet 31 can also be arranged overlappingly in 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.

[0047] Furthermore, if Figure 3aAs shown, the size of each input magnetic pole 211 can be equal, and 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 to each other, 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. Figure 3a In the corresponding embodiment, 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 with opposite polarity correspond to each other one by one, avoiding transmission jumps caused by NS pole mismatch, resulting in increased transmission noise and reduced transmission efficiency.

[0048] 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 for the output permanent magnet 31 to rotate through the central angle corresponding to each output magnetic pole 311 is equal to the time for the second driven permanent magnet 42 to rotate through the central angle corresponding to each second driven magnetic pole 421. Figure 3b In the corresponding embodiment, 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.

[0049] However, if the distance between the first driven permanent magnet 41 and the second driven permanent magnet 42 is too close, which is equivalent to the distance between the input permanent magnet 21 and the second driven permanent magnet 42 being too close, the second driven permanent magnet 42 will be affected by the magnetic field of the input permanent magnet 21, thereby destroying the rotation balance of the second driven permanent magnet 42, causing the transmission device to generate more noise and reduce the transmission efficiency during operation. In order to avoid the above situation, the distance between the first driven permanent magnet 41 and the second driven permanent magnet 42 along the first axis A1 should be greater than 2 mm.

[0050] In order to adjust the speed of the output shaft, 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 the sake of convenience, let the speed of the input shaft 2 be s, the number of poles of the input permanent magnet 21 be n, the number of poles of the first driven permanent magnet 41 be x, the number of poles of the second driven permanent magnet 42 be y, the number of poles of the output permanent magnet 31 be z, and the speed of the output shaft be t. The speed of the input permanent magnet 21 is the same as that of the input shaft 2, which is s. Then the speeds of the first driven permanent magnet 41 and the second driven permanent magnet 42 are s×n / x, and the speed of the output shaft 3 is the same as that of the output permanent magnet 31, which is t=s×n / x×y / z.

[0051] Further, for example, Figure 3a and Figure 3b As shown, the number of input magnetic poles 211 may be greater than the number of first driven magnetic poles 411, and the number of second driven magnetic poles 421 may be greater than the number of output magnetic poles 311. Thus, the speed of the output shaft 3 is greater than the speed of the input shaft 2. Specifically, for example, Figure 3a and Figure 3b As shown, when the number of poles of the input permanent magnet is 10, the number of poles of the driven permanent magnet 1 is 8, the number of poles of the driven permanent magnet 2 is 10, and the number of poles of the output permanent magnet is 8, the speed of the output shaft 3 is 10 / 8×10 / 8=1.5625 times the speed of the input shaft 2. Therefore, the required output shaft speed can be obtained by adjusting the number of magnetic poles, which provides speed support for the setting of the fan on the output shaft.

[0052] According to the present disclosure, the heat dissipation method is improved by using 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. Figure 6 and Figure 7 As shown. 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 input shaft 2, especially toward the motor 8, so as 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, such as Figure 7 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 passed through the transmission device with adjustable pole number to make the fan 8 rotate at a high speed.

[0053] Figure 8a A graph showing the relationship between wind speed and rotation speed ratio, Figure 8b A graph showing the relationship between air volume and rotation speed ratio, Figure 8c A graph showing the relationship between wind pressure and rotation speed ratio, Figure 8a-8c All of them are measured based on a heat dissipation device according to an embodiment of the present disclosure, and are only used for illustration, wherein the speed ratio refers to the ratio of the speed of the output shaft to the speed of the input shaft. It can be seen that the wind speed and the wind volume are linearly positively correlated with the speed ratio, and the wind volume is nonlinearly parabola positively correlated with the speed ratio. By increasing the speed ratio, the heat dissipation effect can be significantly increased.

[0054] The transmission device and heat dissipation device disclosed in the present invention include all the advantages of magnetic transmission, such as contactless transmission, which does not have contact friction, has more reliable stability, can reduce maintenance costs and maintenance cycles; avoids vibration and noise caused by mechanical contact, and therefore performs well in noise and vibration, and is an energy-saving and environmentally friendly transmission method; has high transmission efficiency, and can greatly improve energy utilization efficiency. These advantages are particularly beneficial to heat dissipation, especially the application of heat dissipation of motors, and are beneficial to providing long-term and stable heat dissipation functions, reducing noise caused entirely by heat dissipation, and reducing the energy required for heat dissipation.

[0055] In addition, the transmission device and the heat dissipation device according to the present invention are particularly suitable for the heat dissipation of high-power and low-speed motors. Forced fan cooling will increase costs, and the cooling effect of self-fan cooling is not good. 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.

[0056] Furthermore, the present disclosure also provides other embodiments, such as Figure 4 As shown, the transmission device of the present disclosure includes two driven permanent magnet assemblies 4. Preferably, the two driven permanent magnet assemblies 4 have the same structure. Thus, by the simultaneous action of the two first driven permanent magnets 41 and the two second driven permanent magnets 42, the total torque on the output shaft 3 can be increased, so that the output shaft 3 can drive a larger fan to rotate, thereby achieving a better heat dissipation effect.

[0057] More preferably, the two driven permanent magnet assemblies 4 are symmetrically arranged about the output shaft 3 so that the magnetic forces of the two second driven permanent magnets 42 on the output shaft 3 are completely the same, so that the rotation of the output shaft 3 is more stable and the force is more uniform.

[0058] In addition, according to another embodiment of the present disclosure, for example Figure 5 As shown, the transmission device of the present disclosure includes three driven permanent magnet assemblies 4. Preferably, the three driven permanent magnet assemblies 4 have the same structure. Thus, by the simultaneous action of the three first driven permanent magnets 41 and the three second driven permanent magnets 42, the total torque on the output shaft 3 can be increased, so that the output shaft 3 can drive a larger fan to rotate, thereby achieving a better heat dissipation effect.

[0059] More preferably, the three driven permanent magnet assemblies 4 are symmetrically arranged about the output shaft 3 so that the magnetic forces of the three second driven permanent magnets 42 on the output shaft 3 are completely the same, so that the rotation of the output shaft 3 is more stable and the force is more uniform.

[0060] In addition, it is conceivable that the transmission device according to the present disclosure may further include more driven permanent magnet assemblies, such as four, five, etc. Their structures and symmetrical arrangements can also be derived with reference to the above-mentioned two and three driven permanent magnets to drive a larger fan and thus have a better heat dissipation effect.

[0061] It should be understood that the above description is intended to illustrate rather than limit. For example, the above embodiments (and / or aspects thereof) can be used in combination with each other. In addition, without departing from the scope of the present disclosure, many modifications can be made to adapt specific situations or materials to the teachings of the present disclosure. The functions or performances of the various elements or modules described herein are only for illustration 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 full scope of the equivalents given by the attached claims and these claims.

[0062] 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, characterized in that: include an input shaft extending along a first axis and capable of pivoting about said first axis, an output shaft extending along a second axis parallel to the first axis and capable of pivoting about the second 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 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 circumferential direction, and the polarities of adjacent output magnetic poles are opposite. a driven permanent magnet assembly, capable of pivoting about a third axis parallel to the first axis, having a plurality of first driven magnetic poles and a plurality of second driven magnetic poles arranged in a circumferential direction, the plurality of first driven magnetic poles and the plurality of second driven magnetic poles being spaced apart from each other along the third axis, adjacent first driven magnetic poles having opposite polarities, adjacent second driven magnetic poles having opposite polarities, the plurality of first driven magnetic poles being magnetically coupled to the input permanent magnet and the plurality of second driven magnetic poles being magnetically coupled to the output permanent magnet, so that the pivoting of the input permanent magnet is transmitted to the output permanent magnet through the driven permanent magnet assembly, Wherein, the number of the driven permanent magnet components is 1 or more.

2. The transmission device according to claim 1, characterized in that: The driven permanent magnet assembly includes a first driven permanent magnet and a second driven permanent magnet, the plurality of first driven magnetic poles are arranged in the first driven permanent magnet, and the plurality of second driven magnetic poles are arranged in the second driven permanent magnet, The circumferential dimensions of each input magnetic pole and each first driven magnetic pole are arranged to correspond to each other, so that the time for the input permanent magnet to rotate through the central angle corresponding to each input magnetic pole is equal to the time 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, characterized in that: 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 the second driven magnetic poles of the second driven permanent magnet is greater than the number of the first driven magnetic poles of the first driven permanent magnet, and the number of the 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 2-3, characterized in that: 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 2 to 3, characterized in that: 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, characterized in that: 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, characterized in that: The input shaft is arranged concentrically with the output shaft.

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

9. The transmission device according to claim 8, characterized in that: The transmission device further comprises 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, characterized in that: The number of the driven permanent magnet assemblies is two or three.

11. The transmission device according to claim 10, characterized in that: The driven permanent magnet assembly is arranged symmetrically about the output axis.

12. A heat dissipation device, characterized in that: The heat dissipation device comprises a transmission device as claimed in 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.

13. A motor, comprising a motor body and the heat dissipation device according to claim 12, characterized in that: 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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