CN119813655A - Motor shielding module and transmission device - Google Patents

Abstract

The present invention provides a motor shielding module and a transmission device, the motor shielding module includes a housing, a motor, a transmission shaft, an end cover, a reduction box and a sleeve, the housing is provided with a receiving groove, the motor and the reduction box are installed in the receiving groove, the reduction box is connected to the motor in a transmission manner, the end cover covers the opening of the receiving groove, the end cover is provided with a through hole, the turntable of the reduction box is provided with a sleeve hole, the sleeve is inserted into the sleeve hole, the transmission shaft is inserted into the sleeve through the through hole, and the sleeve is made of insulating material. The motor shielding module of the present invention encapsulates the motor in the housing to prevent the electromagnetic signal generated by the motor from radiating out of the housing, so as to prevent the electromagnetic signal from interfering with the antenna and affecting the communication performance of the antenna.

Description

Motor shielding module and transmission device

Technical Field

The invention belongs to the technical field of mobile communication, and particularly relates to a motor shielding module and a transmission device provided with the motor shielding module.

Background

In the field of mobile communications, antennas are used as key devices for signal transmission and reception, and their performance directly affects the overall efficiency and quality of the communication system. In order to flexibly adjust communication performance, a motor is often adopted in an antenna as a power source to drive various components in the antenna to move. For example, the phase adjustment of the antenna can be realized by driving the phase shifting assembly of the phase shifter to move through the motor so as to optimize the direction and strength of signal transmission, and the motor is also used for driving the installation device of the antenna to move relative to the holding pole so as to flexibly adjust the pitching dip angle and the horizontal angle of the antenna, ensure that the antenna can accurately aim at a target communication area and adapt to different communication requirements and environmental conditions.

Particularly in a multi-frequency antenna system, in order to realize effective transmission of signals in each frequency band, a mechanical declination mode is generally adopted to adjust the downward inclination angle of a wave beam, namely, a transmission device is arranged in the antenna and is connected with a phase shifting component corresponding to each frequency band in the multi-frequency antenna, and the transmission device is driven by a motor to work so as to drive a phase shifting component corresponding to any frequency band to move, thereby realizing phase shifting of the corresponding frequency band and further adjusting the downward inclination angle of the wave beam.

However, although the motor has a significant advantage in driving the antenna element to move, the problem of electromagnetic interference generated during the operation thereof is not negligible. When the motor is in operation, strong electromagnetic radiation is generated due to rapid changes of current and mechanical movement, and the electromagnetic radiation can interfere with the normal operation of the antenna, so that the communication performance of the antenna is reduced. Particularly in a multi-frequency antenna system, due to the existence of a plurality of frequency bands and a complex electromagnetic environment, the electromagnetic interference problem of a motor is more remarkable, and the communication quality and stability of the antenna are seriously affected.

Disclosure of Invention

The primary objective of the present invention is to solve at least one of the above problems and provide a motor shielding module and a transmission device.

In order to meet the purposes of the invention, the invention adopts the following technical scheme:

The invention provides a motor shielding module which is suitable for one of the purposes of the invention and comprises a shell, a motor, a transmission shaft, an end cover, a reduction gearbox and a shaft sleeve, wherein a containing groove is formed in the shell, the motor and the reduction gearbox are arranged in the containing groove, the reduction gearbox is in transmission connection with the motor, the end cover covers the opening of the containing groove, a through hole is formed in the end cover, a shaft sleeve hole is formed in a turntable of the reduction gearbox, the shaft sleeve is inserted into the shaft sleeve hole, the transmission shaft is inserted into the shaft sleeve through the through hole, and the shaft sleeve is made of an insulating material.

In one embodiment, the through hole is a stepped hole, the stepped hole comprises a bearing hole, a bearing is sleeved on the transmission shaft, the bearing is located in the bearing hole, and the bearing is made of an insulating material.

In one embodiment, the through hole is a stepped hole, the stepped hole comprises a disc hole and a shaft hole, the disc hole is far away from the motor than the shaft hole, a fixed disc is sleeved on the transmission shaft and installed in the disc hole, and the fixed disc is fixedly connected with the end cover.

In one embodiment, the aperture of the disc hole is larger than the aperture of the shaft hole, a first gap is formed between the fixed disc and the hole side wall of the disc hole, a second gap is formed between the fixed disc and the hole bottom of the disc hole, a third gap is formed between the transmission shaft and the hole wall of the shaft hole, the first gap, the second gap and the third gap are sequentially communicated, an insulating ring is sleeved on the transmission shaft, and the insulating ring is arranged in the second gap.

Further, the first gap, the second gap and the third gap are communicated to form a Z-shaped structure.

In one embodiment, the end cap is made of an insulating material.

In one embodiment, the drive shaft is made of a metallic or non-metallic material having electromagnetic shielding properties.

In one embodiment, an insulating layer is disposed on the wall of the accommodating groove.

The invention provides a transmission device which is suitable for one of the purposes of the invention, and comprises a shell, wherein a control assembly, an external transmission part and at least one motor shielding module according to any one of the previous purposes are arranged in the shell, the control assembly is electrically connected with the motor shielding module, an output hole is formed in the shell, a transmission shaft of the motor shielding module is in transmission connection with the external transmission part through the output hole, and the external transmission part is used for being in transmission connection with a phase shifting assembly of a phase shifter.

In one embodiment, a shielding plate is further arranged in the shell, the shielding plate is arranged between the output hole and the motor shielding module, a shielding hole is formed in the shielding plate, and one end, far away from the accommodating groove, of the end cover of the motor shielding module is arranged in the shielding hole.

The present invention has many advantages over the prior art, including but not limited to:

First, the motor generates an electromagnetic field and an electromagnetic signal during operation. Without proper electrical isolation between the motor and the drive shaft, these electromagnetic signals may be transmitted through the drive shaft to the external environment, causing electromagnetic interference. Such interference may affect the normal operation of other electronic devices and may even reveal sensitive information, posing a threat to the security and confidentiality of the system. The present invention effectively solves this problem by providing an insulating sleeve. The motor can be electrically disconnected from the transmission shaft, so that electromagnetic signals generated by the motor are prevented from leaking to the outside through the transmission shaft.

Second, the insulated sleeve enhances the stability and safety of the system in addition to preventing leakage of electromagnetic signals. Under complex electromagnetic environment and severe weather conditions, such as thunder and lightning, static electricity and the like, the insulating shaft sleeve can protect the transmission shaft from electromagnetic impact, and current leakage or short-circuit accidents are prevented. This helps to extend the life of the system and improve the reliability and safety of the system.

In addition, the motor and the reduction gearbox are integrated in the shell, and the components are reasonably distributed through the accommodating groove, so that the whole motor shielding module is compact in structure and small in occupied space. For the equipment with extremely strict space requirements, such as an antenna, the space utilization rate is greatly improved, and the overall design and the optimized layout of the antenna are facilitated.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

fig. 1 is a perspective view of a motor shielding module according to the present invention.

Fig. 2 is an exploded view of a motor shielding module according to an exemplary embodiment of the present invention.

Fig. 3 is a schematic cross-sectional view of a motor shielding module according to an exemplary embodiment of the present invention.

Fig. 4 is an exploded view of a motor shielding module according to an embodiment of the present invention.

Fig. 5 is a schematic cross-sectional view of a motor shielding module according to an embodiment of the invention.

Fig. 6is an enlarged view of a portion a of fig. 5.

Fig. 7 is a schematic perspective view of a transmission according to an exemplary embodiment of the present invention.

Fig. 8 is a schematic structural view of a transmission (not shown) according to an exemplary embodiment of the present invention.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and are not to be construed as limiting the present invention.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. The term "and/or" as used herein includes all or any element and all combination of one or more of the associated listed items.

It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The invention provides a motor shielding module which can shield electromagnetic signals generated by a motor arranged in the motor shielding module so as to prevent the electromagnetic signals generated by the motor from affecting the communication performance of an antenna.

In an exemplary embodiment of the present invention, in combination with fig. 1 to 3 or in combination with fig. 1, 4 and 5, the motor shielding module 100 includes a housing 110, a motor 120, a transmission shaft 130, an end cover 140, a reduction gearbox 180 and a shaft sleeve 190. The housing 110 is provided with a containing groove 111, the motor 120 and the reduction gearbox 180 are installed in the containing groove 111, and the end cover 140 covers the opening of the containing groove 111 to seal the containing groove 111, so as to form a closed space, so that electromagnetic signals generated during the operation of the motor 120 are prevented from leaking.

An insulating layer is disposed on the wall of the accommodating groove 111 to prevent electromagnetic signals generated by the motor 120 from leaking to the outside through the housing 110, so as to prevent the electromagnetic signals from interfering with the operation of the antenna. In the present embodiment, the housing 110 is made of a metal material to improve structural stability of the motor shielding module 100.

In this embodiment, the end cover 140 is made of an insulating material, such as a plastic material, so that an insulating layer is not required on the surface of the end cover 140, and shielding of electromagnetic signals can be achieved, so that electromagnetic signals are prevented from being emitted to the outside through the end cover 140.

In this embodiment, the end cap 140 is exemplified as being made of a plastic material, but the present invention is not to be construed as being limited thereto.

Referring to fig. 3 or 5, the output shaft 121 of the motor 120 is inserted into the reduction gearbox 180, that is, the motor 120 drives torque through the reduction gearbox 180. The end cover 140 is provided with a through hole, the through hole is a stepped hole 141, the transmission shaft 130 is inserted into the stepped hole 141 to extend into the accommodating groove 111 through the stepped hole 141, and one end (called as a connection end 131) of the transmission shaft 130 extending into the accommodating groove 111 is inserted onto the turntable 181 of the reduction gearbox 180, so that the motor 120 drives the transmission shaft 130 to rotate through the reduction gearbox 180, one end (called as a transmission end 132) of the transmission shaft 130 located outside the accommodating groove 111 is used for being connected with a part of the antenna to drive the corresponding part of the antenna to move, for example, the transmission end 132 of the transmission shaft 130 is connected with a phase shifting part of the antenna, the transmission shaft 130 is driven to rotate through the motor 120, and the phase shifting part is driven to move through the transmission shaft 130 to implement phase shifting.

The transmission shaft 130 is made of a metal material or a nonmetal material capable of shielding electromagnetic signals, so that the transmission shaft 130 can shield electromagnetic signals, and electromagnetic signals generated by the motor 120 are prevented from being scattered outside the motor shielding module 100 along the transmission shaft 130, and the communication performance of the antenna is prevented from being affected. In the present embodiment, it is recommended that the transmission shaft 130 is made of a metal material having an electromagnetic shielding effect such as aluminum, copper, silver, etc., so that the transmission shaft 130 has an electromagnetic shielding effect without reducing the rigidity of the transmission shaft 130.

In one embodiment, the drive shaft 130 may be made of an insulating material to shield electromagnetic signals to prevent electromagnetic signals generated by the motor 120 from diverging along the drive shaft 130 to the antenna components. The insulating material is preferably a plastic material, in particular a plastic material with a relatively high rigidity, so that the transmission shaft 130 can well transmit the torque output by the motor 120, and drive the components of the antenna to move.

In another embodiment, the transmission shaft 130 is made of a metal material, and an insulating layer is disposed on a surface of the transmission shaft 130 to shield electromagnetic signals, so as to prevent electromagnetic signals generated by the motor 120 from being scattered onto the antenna along the transmission shaft 130, and avoid affecting the communication performance of the antenna.

In an exemplary embodiment of the present invention, a through hole (referred to as a sleeve hole 182) is formed on the turntable 181 of the reduction gearbox 180, and the sleeve 190 is inserted into the sleeve hole 182. The connection end 131 of the transmission shaft 130 is inserted into the shaft sleeve 190, so that the transmission shaft 130 is connected with the turntable 181 through the shaft sleeve 190.

In this embodiment, the sleeve 190 is made of an insulating material, so as to separate the transmission shaft 130 and the reduction gearbox 180 through the sleeve 190, so that the transmission shaft 130 and the reduction gearbox 180 are insulated from each other, and also the transmission shaft 130 and the motor 120 are insulated from each other, that is, the transmission shaft 130 is not electrically connected to the reduction gearbox 180 and the motor 120, so that electromagnetic signals generated by the motor 120 are further prevented from being dispersed outside the motor shielding module 100 through the transmission shaft 130, and electromagnetic signals generated by the motor 120 are prevented from interfering with the operation of the antenna. In this embodiment, it is recommended that the sleeve 190 be made of a plastic material or that the sleeve 190 be made of a metal material, but the sleeve 190 be covered with an insulating layer.

Referring to fig. 3, the stepped hole 141 includes a disc hole 1411 and a shaft hole 1412, the aperture of the disc hole 1411 is larger than the aperture of the shaft hole 1412, the disc hole 1411 and the shaft hole 1412 are sequentially connected from the driving end 132 of the driving shaft 130 to the connection end 131 of the driving shaft 130 along the axial direction of the driving shaft 130, and the disc hole 1411 is disposed at one end of the end cover 140. The fixed disk 150 is provided with a socket hole, the fixed disk 150 is sleeved on the transmission shaft 130 through the socket hole, and the fixed disk 150 is installed in the disk hole 1411.

In one embodiment, referring to fig. 5 and 6, a first gap 171 is formed between the sidewall of the fixed disk 150 and the hole sidewall of the disk hole 1411, a second gap 172 is formed between the bottom wall of the fixed disk 150 and the bottom wall of the disk hole 1411, a third gap 173 is formed between the transmission shaft 130 and the shaft hole 1412, and the first gap 171, the second gap 172, and the third gap 173 are sequentially connected. The first gap 171, the second gap 172, and the third gap 173 are sequentially connected to each other to form a Z-shaped gap.

If the electromagnetic signal generated by the motor 120 is desired to be emitted out of the accommodating groove 111, the electromagnetic signal needs to pass through the gap formed by the third gap 173, the second gap 172 and the first gap 171 when the accommodating groove 111 is closed by the end cover 140, the gap with the Z-shaped structure will generate a tunneling effect on the electromagnetic signal, increase the loss of the electromagnetic signal in the transmission process, and greatly block and weaken the electromagnetic signal generated by the motor 120, so as to avoid leakage of the electromagnetic signal generated by the motor 120 and avoid interference with the antenna operation.

Specifically, firstly, the electromagnetic signal generated by the motor 120 diverges along the third gap 173, but because the third gap 173 is opposite to the fixed disk 150, the fixed disk 150 reflects the electromagnetic signal, so that the electromagnetic signal re-enters the enclosed space to reduce the amount of the electromagnetic signal output to the outside and weaken the strength of the electromagnetic signal, secondly, after a part of the signal is refracted from the third gap 173 into the second gap 172, because the second gap 172 is opposite to the hole side wall of the disk hole 1411, the hole side wall of the disk hole 1411 reflects the electromagnetic signal onto the transmission shaft 130, and part of the electromagnetic signal re-enters the first gap 171 and the accommodating groove 111 to reduce the amount of the electromagnetic signal output to the outside and weaken the strength of the electromagnetic signal, and afterwards, the amount of the electromagnetic signal refracted into the first gap 171 through the second gap 172 is drastically reduced compared with the amount of the electromagnetic signal generated by the motor 120, so that the amount of the electromagnetic signal output to the motor 120 to the motor shielding module 100 is smaller and the strength of the electromagnetic signal is also remarkably reduced.

In this embodiment, the transmission shaft 130 is sleeved with an insulating ring 161, and the insulating ring 161 is made of an insulating material, and it is recommended that the insulating ring 161 be made of a plastic material, but this should not be construed as limiting the present invention. The insulating ring 161 is sleeved on the transmission shaft 130, the insulating ring 161 is also located in the disc hole 1411, and the insulating ring 161 is located between the fixed disc 150 and the bottom wall of the disc hole 1411, that is, the insulating ring 161 is located in the second gap 172.

Because the insulating ring 161 is located in the second gap 172, the insulating ring 161 can prevent the electromagnetic signal refracted by the third gap 173 and entering the second gap 172 from further diverging, and under the blocking of the insulating ring 161, the electromagnetic signal cannot cross the insulating ring 161 and enter the first gap 171, so that the electromagnetic signal is prevented from diverging out of the motor shielding module 100, and the electromagnetic signal generated by the motor 120 cannot interfere with the operation of the antenna.

In this embodiment, the fixing plate 150 applies pressure to the insulating ring 161, so that the insulating ring 161 can stably block the second gap 172, and avoid a gap between the insulating ring 161 and the second gap 172, so that the insulating ring 161 can block electromagnetic signals emitted into the second gap 172, and avoid the electromagnetic signals from being emitted out of the motor shielding module 100, so as to avoid interference with the operation of the antenna.

In this embodiment, referring to fig. 3 or fig. 5, the fixing plate 150 is a flange, the flange is fixedly connected with the end cover 140, and the flange is matched with the stepped hole 141 on the end cover 140 to position the transmission shaft 130, so that the transmission shaft 130 can be stably inserted into the accommodating groove 111 to transmit the torque output by the motor 120. In one embodiment, it is recommended that the retainer plate 150 be integrally formed with the end cap 140.

In this embodiment, the end cap 140 is made of a metal material to improve structural stability of the motor shielding module 100. In a further embodiment, an insulating layer is provided on the surface of the end cover 140 made of metal material, so as to prevent electromagnetic signals generated by the motor 120 from being emitted to the outside through the end cover 140, thereby preventing electromagnetic signals from interfering with the operation of the antenna.

In one embodiment, in combination with fig. 5, the stepped bore 141 further includes a bearing bore 1413, the bearing bore 1413 being disposed adjacent to the shaft bore 1412, and the bearing bore 1413 being disposed closer to the motor 120 than the shaft bore 1412. Referring to fig. 5 and 4, the motor shielding module 100 further includes a bearing 163, the bearing 163 is sleeved on the transmission shaft 130, the bearing 163 is installed in the bearing hole 1413, the radial degree of freedom is located on the transmission shaft 130 through the bearing 163, and the power loss during idle running of the transmission shaft 130 is reduced.

In this embodiment, the bearing 163 is made of an insulating material, so as to prevent electromagnetic signals from being scattered onto the transmission shaft 130 through the bearing 163, and prevent electromagnetic signals from being scattered to the outside through the transmission shaft 130, and prevent electromagnetic signals from interfering with the antenna operation. In the present embodiment, it is recommended that the bearing 163 be made of a plastic material.

In one embodiment, the motor shielding module 100 further includes a control circuit electrically connected to the motor 120 to control operation of the motor 120. Referring to fig. 2 and 3, the control circuit is integrated on the circuit board 112, and the control circuit is electrically connected to an external device through a cable, and the external device sends a signal to the control circuit to control the motor 120 to work.

The invention also provides a transmission device 200, the transmission device 200 is arranged in the multi-frequency antenna, the transmission device 200 is in transmission connection with the phase shifting device in the multi-frequency antenna, the transmission device 200 is respectively connected with the phase shifting components corresponding to each frequency band in the multi-frequency antenna through the transmission component 230, and the transmission device 200 drives the phase shifting component corresponding to any frequency band to move so as to realize phase shifting.

Specifically, referring to fig. 7 and 8, the transmission device 200 includes a housing 210, a control assembly 220, a transmission component 230, and the motor shielding module 100 described above, where the control assembly 220 and the motor shielding module 100 are disposed in the housing 210, and the control assembly 220 is electrically connected to a control circuit of the motor shielding module 100, so that the control assembly 220 can control the motor shielding module 100 to work through the control circuit.

The housing 210 is provided with an output hole 211, the transmission shaft 130 of the motor shielding module 100 may extend out of the housing 210 through the output hole 211, the transmission shaft 130 is connected with the transmission member 230, and the transmission member 230 is in transmission connection with the phase shifting assembly of the phase shifting device. When the motor 120 rotates, the motor 120 drives the phase shifting assembly to move through the transmission shaft 130, so that the phase shifting device shifts the phase, and the phase of the signal is changed.

In this embodiment, the transmission shaft 130 is not in contact with the output hole 211, so as to avoid that the transmission shaft 130 is electrically connected with the housing 210 through the output hole 211, that is, avoid that the motor 120 is electrically connected with the housing 210 through the transmission shaft 130, so that an electromagnetic signal generated by the motor 120 is not dispersed to the outside through the housing 210, that is, the antenna is not interfered.

In one embodiment, referring to fig. 8, a shielding plate 240 is further disposed in the housing 210, the shielding plate 240 is disposed between the output hole 211 and the motor shielding module 100, a shielding hole 241 is formed on the shielding plate 240, and an end (referred to as a first end 142) of the end cover 140, which is far away from the motor 120, is overlapped on the shielding hole 241.

The shielding plate 240 is made of an insulating material, when the first end 142 of the end cover 140 is disposed in the shielding hole 241, the motor shielding module 100 may be suspended in the housing 210, so as to avoid the motor shielding module 100 from being electrically connected with the housing 210, and thus avoid the electromagnetic signal generated by the motor 120 from being output to the outside through the housing 210, and interfere with the antenna operation. In addition, an insulating support is provided in the housing 210, and the insulating support is made of an insulating material. The motor shielding module 100 is supported by an insulating support so that the motor shielding module 100 can be stably disposed in the housing 210.

In one embodiment, an insulating layer is disposed on an inner wall of the housing 210, so that when the motor shielding module 100 disposed in the housing 210 contacts with the housing 210, the motor shielding module 100 is not electrically connected with the housing 210, and thus electromagnetic signals generated by the motor 120 are not dispersed to the outside through the housing 210, and electromagnetic signals are prevented from interfering with the antenna operation.

In summary, the motor shielding module of the invention encapsulates the motor in the housing, so as to prevent electromagnetic signals generated by the motor from diverging out of the housing, so as to avoid electromagnetic signals from interfering with the operation of the antenna and affecting the communication performance of the antenna.

The above description is only illustrative of the preferred embodiments of the present invention and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the invention referred to in the present invention is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept described above. Such as the above-mentioned features and the features having similar functions (but not limited to) of the invention.

Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are example forms of implementing the claims.

Claims (10)

1. The utility model provides a motor shielding module, its characterized in that, includes shell, motor, transmission shaft, end cover, reducing gear box and axle sleeve, the storage tank has been seted up on the shell, the motor with the reducing gear box install in the storage tank, the reducing gear box with motor drive is connected, the end cover covers the opening of storage tank, the through-hole has been seted up on the end cover, the axle sleeve hole has been seted up on the carousel of reducing gear box, the axle sleeve insert in the axle sleeve hole, the transmission shaft warp the through-hole insert in the axle sleeve, the axle sleeve is made by insulating material.

2. The motor shielding module of claim 1, wherein the through hole is a stepped hole, the stepped hole includes a bearing hole, the drive shaft is sleeved with a bearing, the bearing is located in the bearing hole, and the bearing is made of an insulating material.

3. The motor shielding module of claim 1, wherein the through hole is a stepped hole, the stepped hole comprises a disc hole and a shaft hole, the disc hole is far away from the motor than the shaft hole, a fixed disc is sleeved on the transmission shaft and is arranged in the disc hole, and the fixed disc is fixedly connected with the end cover.

4. The motor shielding module according to claim 3, wherein the aperture of the disc hole is larger than the aperture of the shaft hole, a first gap is formed between the fixed disc and the hole side wall of the disc hole, a second gap is formed between the fixed disc and the hole bottom of the disc hole, a third gap is formed between the transmission shaft and the hole wall of the shaft hole, the first gap, the second gap and the third gap are sequentially communicated, an insulating ring is sleeved on the transmission shaft, and the insulating ring is arranged in the second gap.

5. The motor shielding module of claim 4, wherein the first gap, the second gap, and the third gap are in communication to form a Z-shaped structure.

6. The motor shielding module of claim 1, wherein the end cap is made of an insulating material.

7. The motor shielding module of claim 1, wherein the drive shaft is made of a metallic material or a non-metallic material having electromagnetic shielding properties.

8. The motor shielding module of claim 1, wherein an insulating layer is provided on a wall of the accommodating groove.

9. A transmission device, which is characterized by comprising a shell, wherein a control assembly, an external transmission part and at least one motor shielding module according to any one of claims 1 to 8 are arranged in the shell, the control assembly is electrically connected with the motor shielding module, an output hole is formed in the shell, a transmission shaft of the motor shielding module is in transmission connection with the external transmission part through the output hole, and the external transmission part is used for being in transmission connection with a phase shifting assembly of a phase shifter.

10. The transmission of claim 9, wherein a shielding plate is further disposed in the housing, the shielding plate is disposed between the output hole and the motor shielding module, a shielding hole is formed in the shielding plate, and an end of an end cover of the motor shielding module, which is far away from the accommodating groove, is disposed in the shielding hole.