An integrated stirring drive

Abstract

The present invention discloses an integrated stirring driver, which relates to the field of electronic measurement technology. It includes a driving stirrer body, which includes an electromagnetic shielding unit, which includes a driver housing, an upper cover, a maintenance window cover, an output shaft shielding structure, an output shaft shielding cover, and a shielding copper mesh located between the driver housing and the shielding cover; the interior of the driver housing is divided into a control unit installation area and a power unit installation area; a power output unit, which is installed in the power unit installation area; and a control unit, which is installed in the control unit installation area. The present invention can be quickly installed as a whole inside or outside the shielding body, reducing the factors affecting the installation to a minimum. The number of transmission connection components is reduced, and the connection deviation is less affected by the installation. The electromagnetic interference will not increase due to its installation inside or outside the shielding body. The connection shielding process during on-site installation is simple and controllable.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic measurement, and in particular relates to an integrated stirring driver. Background Art

[0002] An electromagnetic reverberation chamber is a test device used for electromagnetic compatibility and radio frequency performance testing. It is commonly used in applications such as electromagnetic compatibility testing, over-the-air (OTA) testing, radio frequency channel simulation, shielding performance testing, and field strength probe calibration. It can achieve high field strength at a low cost and in a small footprint.

[0003] In principle, it is a cavity resonator with a high Q value. Therefore, the spatial distribution of the electric and magnetic field strengths within it is uneven (exhibiting a standing wave state); to reduce this unevenness, one or more tuners that can change the spatial position are usually used to change the internal field distribution to achieve a statistically uniform field distribution. The most common tuner is a rotatable stirrer in the form of a paddle; this is achieved by mounting a metal plate on a rotating shaft and using a motor to drive the shaft to rotate, thereby changing the spatial position of the metal plate.

[0004] The lowest usable frequency of a reverberation chamber depends on its size (especially the shortest side of a rectangular chamber) and the design of the tuner (which must be installed on the shortest side, limiting its size to that length). Smaller chambers have higher lowest usable frequencies than larger ones. As high-frequency applications become increasingly common, reverberation chambers are becoming more compact and suitable for conventional indoor installations.

[0005] On the one hand, in current reverberation chamber designs, both domestically and internationally, the motor and its drive circuitry are typically placed outside a shielded cavity to prevent interference with the test field. Because the rotating shaft must pass through the shield, the apertures where the shaft passes through the shield must be shielded to ensure shielding. Typically, an output shaft is installed at this wall penetration, connecting the external motor shaft to the internal agitator shaft via a coupling.

[0006] First, for unshielded external motors, the only shielding provided is the output shaft, and electromagnetic interference could still affect reverberation chamber testing. Adding a shielding cover to the external motor, however, requires separate installation of the motor and shield, significantly impacting shielding effectiveness during on-site installation and making installation, operation, and subsequent maintenance inconvenient.

[0007] Furthermore, the connection between the multi-section shaft and the additional coupling can introduce some coaxial deviation during on-site installation. While the coupling's elasticity can accommodate this deviation, the resulting positioning deviation and wear and tear over time can lead to a decrease in transmission accuracy, worsening test repeatability. Frequent zero calibration is necessary in actual use.

[0008] On the other hand, the height of a conventional room determines the lowest usable frequency after placing the reverberation chamber therein (3-4m corresponds to approximately tens of megahertz), which just covers the frequency range used in most EMC radiated immunity tests (low cost and high field strength are one of the main purposes of using a reverberation chamber for radiated immunity testing). Therefore, the height needs to be fully utilized to reduce the lowest usable frequency. External installation requires maintaining the device height and additional installation and construction space, which will increase the lowest usable frequency and ultimately fail to meet the standard requirements. Summary of the Invention

[0009] The purpose of the present invention is to provide an integrated stirring drive to overcome the problems of existing external installation technology, such as being greatly affected by installation, occupying a large external space, accumulating large deviations after long-term use, and having low shielding efficiency and poor shielding on-site treatment effect.

[0010] To solve the above technical problems, the present invention is achieved through the following technical solutions:

[0011] The present invention is an integrated stirring driver, comprising a driving stirrer body, wherein the driving stirrer body comprises: an electromagnetic shielding unit, wherein the electromagnetic shielding unit comprises a driver housing, an upper cover, a maintenance window cover, an output shaft shielding structure, an output shaft shielding cover, and a shielding copper mesh located between the driver housing and the shielding cover; the interior of the driver housing is divided into a control unit installation area and a power unit installation area; a power output unit, wherein the power output unit is installed in the power unit installation area; and a control unit, wherein the control unit is installed in the control unit installation area.

[0012] As a preferred technical solution of the present invention, the driving stirrer body can be installed horizontally or vertically inside or outside the reverberation chamber.

[0013] As a preferred technical solution of the present invention, when the driving stirrer body is installed outside the reverberation chamber, it is connected to the reverberation chamber through the flange on the upper cover, and a shielding gasket is installed at the connection position.

[0014] As a preferred technical solution of the present invention, a regional shielding partition is provided between the control unit installation area and the power unit installation area, and a feedthrough capacitor and an optical fiber waveguide are provided on the regional shielding partition.

[0015] As a preferred technical solution of the present invention, the power output unit includes a servo motor and an encoder, a rotating hollow speed reduction disc and an output shaft; the rotating hollow speed reduction disc is connected to the motor through its own motor flange, and a shielding gasket is installed on the connecting surface; the rotating hollow speed reduction disc is connected to the disc end of the output shaft through its own rotating surface flange, and a shielding gasket is installed on the connecting surface.

[0016] As a preferred technical solution of the present invention, the output shaft adopts a disc cylindrical shaft with an inverted T-shaped cross section.

[0017] As a preferred technical solution of the present invention, the control unit includes a main control board, and a motor drive unit, an optical zero position detection unit, an optical fiber communication unit, and a power supply filter electrically connected to the main control board, and the main control board communicates with an external controller via optical fiber.

[0018] As a preferred technical solution of the present invention, the optical zero position detection unit includes a fiber optic detection head and a fiber optic sensor. The fiber optic detection head is arranged in the power unit installation area. The fiber optic detection head is connected to the fiber optic sensor through an optical fiber waveguide. The fiber optic detection head is a reflective fiber optic brightness detector.

[0019] As a preferred technical solution of the present invention, the output shaft shielding structure also includes an inner sleeve and an outer sleeve which are sleeved on the outside of the output shaft, an S-shaped labyrinth groove is provided between the inner sleeve and the outer sleeve, and the labyrinth groove is filled with conductive lubricating oil; the output shaft shielding cover is fixed on the output shaft; the output end of the output shaft adopts a needle roller bearing and a double-layer plane thrust bearing; the upper cover body is located at the output shaft and is provided with a groove, and the shielding copper mesh is fixed in the groove by a pressing sheet; the output shaft shielding cover and the upper cover body are locked by flange screws, and a shielding gasket is installed on the contact surface.

[0020] As a preferred technical solution of the present invention, shielding gaskets are provided between the needle roller bearing, the double-layer plane thrust bearing, the upper cover body, and the output shaft.

[0021] The present invention has the following beneficial effects:

[0022] The present invention has the advantage of allowing for rapid installation within or outside the shield, minimizing installation impacts. Another advantage is that it reduces the number of transmission connection components, minimizing connection deviations affected by installation, and generally eliminating the need for manual zero calibration during subsequent use. Furthermore, the present invention utilizes an output shaft shielding structure, which has the advantage of preventing increased electromagnetic interference caused by installation within or outside the shield, making the connection shielding process simple and controllable during on-site installation.

[0023] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0026] Figure 2 Schematic diagram of the internal structure of the present invention;

[0027] Figure 3 This is a schematic diagram of the installation position of the stirring drive in the present invention;

[0028] Figure 4 It is a cross-sectional view of the output shaft in the present invention.

[0029] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0030] 1-Driver housing; 21-Upper cover, 22-Maintenance window cover; 3-Output shaft, 31-Output shaft shielding cover, 32-Double-layer plane thrust bearing, 33-Needle roller bearing, 34-Outer sleeve, 35-Inner sleeve, 36-Labyrinth groove, 37-Output shaft inverted T-shaped base, 38-Shielding gasket; 4-Fiber optic adapter; 5-Control unit installation area, 51-Main control board, 52-Fiber optic sensor, 53-Fiber optic communication unit, 54-Motor drive unit, 55-AC / DC converter, 56-Power supply filter; 6-Fiber optic waveguide; 7-Feedback capacitor; 8-Power unit installation area, 81-Rotary hollow reduction platform, 82-Servo motor, 83-Fiber optic detection head; 9-Shielded copper mesh; 10-Fiber optic; 11-Stirring driver body; 12-Floor; 13-Reverberation chamber; 14-Stirring paddle. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "around" and the like indicating orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] like Figure 1-4 As shown: an integrated stirring driver, including a driving stirrer body 11, the driving stirrer body 11 includes: an electromagnetic shielding unit, the electromagnetic shielding unit includes a driver housing 1, an upper cover 211, a maintenance window cover 22, an output shaft shielding structure, an output shaft shielding cover 31, and a shielding copper mesh 9 located between the driver housing 1 and the output shaft shielding cover 31;

[0034] The interior of the driver housing 1 is divided into a control unit mounting area 5 and a power unit mounting area 8; a power take-off unit (POT) is mounted in power unit mounting area 8; and a control unit (CU) is mounted in control unit mounting area 5. The agitator body 11 can be mounted horizontally or vertically inside or outside the reverberation chamber 13. When mounted outside the reverberation chamber 13, the agitator body 11 is connected to the reverberation chamber 13 via a flange on the upper cover 21, with a shielding gasket installed at the connection point.

[0035] In this embodiment, the stirring drive mainly consists of three parts: an electromagnetic shielding unit, a power output unit, and a control unit. Its advantage is that it can be quickly arranged horizontally or vertically inside or outside the reverberation chamber, minimizing the impact of installation factors on the reverberation chamber performance. Another advantage is that the number of transmission connection components is reduced, and the connection deviation is less affected by installation. Generally, manual zero calibration is not required during subsequent use after installation.

[0036] like Figure 2 As shown: a regional shielding partition is provided between the control unit installation area 5 and the power unit installation area 8, and a through-hole capacitor and an optical fiber waveguide are provided on the regional shielding partition.

[0037] In this embodiment, the regional shielding partition of the driver housing 1 divides the power unit installation area and the control unit installation area into two independent shielding areas. The through-hole capacitor on the shielding partition between the two separate shielding areas further reduces the signal interference from the power unit side to the control unit side, avoiding high-frequency interference from entering the control unit along the signal line.

[0038] like Figure 2As shown: the power output unit includes a servo motor 82 and an encoder, a rotating hollow reduction disc 81 and an output shaft 3; the rotating hollow reduction disc 81 is connected to the servo motor 82 through its own motor flange, and a shielding gasket is installed on the connecting surface; the rotating hollow reduction disc 81 is connected to the disc end of the output shaft 3 through its own rotating surface flange, and a shielding gasket is installed on the connecting surface.

[0039] The output shaft 3 is a disc cylindrical shaft with an inverted T-shaped cross section.

[0040] In this embodiment, the transmission shaft adopts a disc cylindrical transmission shaft with an inverted T-shaped cross section. The disc end is flange-connected to the rotating surface of the reduction plate, and the output shaft end extends out of the output shaft shielding cover through the shielding structure.

[0041] like Figure 2 As shown, the control unit includes a main control board 51, a motor drive unit 54, an optical zero-position detection unit, a fiber optic communication unit 53, and a power filter 56, all electrically connected to the main control board 51. The main control board 51 communicates with an external controller via optical fiber. The optical zero-position detection unit includes a fiber optic detection head 83 and a fiber optic sensor 52. The fiber optic detection head 83 is located in the power unit mounting area 8 and is connected to the fiber optic sensor 52 via an optical fiber waveguide. The fiber optic detection head 83 is a reflective fiber optic brightness detector.

[0042] In this embodiment, the main control board 51 is connected to other units, receives inputs from various units, and is responsible for the centralized control of all parts; the motor drive unit 54 converts the control signal of the main control board 51 into a current signal of the servo motor 82 and reads the motor encoder signal and transmits it to the main control board 51; the optical zero position detection unit uses reflective optical fiber brightness detection to detect the zero position line on the drive shaft disk, and the optical fiber used for zero position detection passes through the shielding partition via a waveguide. Compared with the mechanical zero position, the positioning accuracy is greatly improved, the stability is high, and it is not affected by electromagnetic interference signals; the optical fiber communication unit 53 and the optical fiber conversion connector 4 are connected through the optical fiber 10 and perform photoelectric signal conversion, providing a command interaction channel with the external controller; the power filter 86 provides driver input power filtering to avoid bidirectional signal interference along the power line.

[0043] like Figure 4As shown, the output shaft shielding structure also includes an inner sleeve 35 and an outer sleeve 34, which are sleeved around the output shaft 3. An S-shaped labyrinth groove 36 is provided between the inner sleeve 35 and the outer sleeve 34, and the labyrinth groove 36 is filled with conductive lubricant. The output shaft shielding cover 31 is fixed to the output shaft 3. The output end of the output shaft 3 utilizes a needle roller bearing 33 and a double-layer planar thrust bearing 32. The upper cover 21 is provided with a groove on the output shaft 3, and the shielding copper mesh 9 is fixed in the groove by a pressing plate. The output shaft shielding cover 31 and the upper cover 21 are fastened together with flange screws, and shielding gaskets are installed on their contact surfaces. Shielding gaskets are provided between the needle roller bearing 33, the double-layer planar thrust bearing 32, the upper cover 2, and the output shaft 3.

[0044] In this embodiment, a cylindrical shielding cover (i.e., an inner sleeve 35 and an outer sleeve 34) is installed on the outside of the transmission shaft 3 to connect the driver housing 1 and the output shaft shielding cover 31. The output shaft shielding cover 31 is fixed on the power output shaft 4. Its main function is to press the shielding pad material on the inside of the slide groove on the cover plate, and form a conductive contact surface through the contact between the shielding copper mesh and the cover plate slide groove, which reduces the gap impedance, thereby improving the shielding effectiveness of the stirring drive and ensuring that external interference does not directly enter the motor area outside the shielding cover; a labyrinth groove 36 with an S-shaped cross-section is formed between the shielding cover and the output shaft 3 through two layers of cylinders with different diameters, and conductive lubricating oil is partially injected into the groove. The labyrinth groove is filled with conductive lubricating oil, which can reduce the gap impedance of the labyrinth groove. At the same time, the conductive lubricating oil can also reduce the friction between the output shaft systems. The two layers of cylinders are respectively connected and fixed to the shaft and the cylindrical shielding cover, thereby increasing the length of the signal propagation path and thus increasing the attenuation, forming the innermost shielding effect; the labyrinth groove 36 is close to the entrance of the output shaft shielding cover 31, and a needle roller bearing 33 and a double-layer plane thrust bearing 32 are installed in sequence from the inner to the outer, and are connected to the cylindrical shielding cover through a bearing sleeve. There are output shaft shielding covers at both ends of the bearing, and the bearing is injected with conductive lubricating oil. The middle layer shielding effect is formed by the narrow gap structure of the bearing; a sealed power output shaft labyrinth groove is formed between the outer sleeve 34, the inner sleeve 35 and the output shaft inverted T-shaped base 37. The labyrinth groove increases the gap path depth at the output shaft, which can effectively attenuate interfering electromagnetic waves and enhance the overall shielding effectiveness. The output shaft 3, extending beyond the output shaft shielding cover 31, is surrounded by a groove with a metal wear-resistant sheet fixed inside. A conductive copper mesh pad with a wear-resistant coating is mounted on top of this. A pressure plate is installed on the output shaft 3 to press the conductive copper mesh pad. As the pressure plate rotates with the shaft, the conductive copper mesh pad strengthens the electrical connection between the shaft and the output shaft shielding cover. Adjusting the tightening force of the pressure plate can adjust the shielding effect, thereby creating a reinforced outer shielding effect. The dual-bearing structure consists of a double-layer planar thrust bearing 32 and a needle roller bearing 33. Shielding pads are included between the bearings and the cover plate, between the bearings, and between the bearings and the output shaft. This increases the conductive contact surface of the output shaft, reduces the output shaft gap impedance, and improves shielding effectiveness, while also reducing friction caused by the output shaft's rotation.

[0045] Throughout this specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0046] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. An integrated stirring drive, comprising a driving stirrer body (11), characterized in that: The driving agitator body (11) comprises: An electromagnetic shielding unit, comprising a driver housing (1), an upper cover (21), a maintenance window cover (22), an output shaft shielding structure, an output shaft shielding cover (31), and a shielding copper mesh (9) located between the driver housing (1) and the output shaft shielding cover (31); The interior of the driver housing (1) is divided into a control unit installation area (5) and a power unit installation area (8), a regional shielding partition is provided between the control unit installation area (5) and the power unit installation area (8), and a through-hole capacitor and an optical fiber waveguide are provided on the regional shielding partition; A power output unit, the power output unit being installed in the power unit installation area (8), the power output unit comprising a servo motor (82) and an encoder, a rotating hollow speed reduction disc (81) and an output shaft (3); The rotating hollow speed reduction disc (81) is connected to the servo motor (82) via its own motor flange, and a shielding gasket is installed on the connection surface; The rotating hollow speed reduction disc (81) is connected to the disc end of the output shaft (3) via its own rotating surface flange, and a shielding gasket is installed on the connecting surface; A control unit, the control unit being installed in the control unit installation area (5); The output shaft shielding structure further comprises an inner shaft sleeve (35) and an outer shaft sleeve (34) sleeved on the outside of the output shaft (3), an S-shaped labyrinth groove (36) is provided between the inner shaft sleeve (35) and the outer shaft sleeve (34), and the labyrinth groove (36) is filled with conductive lubricating oil; The output shaft shielding cover (31) is fixed on the output shaft (3); The output end of the output shaft (3) adopts a needle roller bearing (33) and a double-layer plane thrust bearing (32); The upper cover (21) is provided with a groove at the output shaft (3), and the shielding copper mesh (9) is fixed in the groove by a pressing sheet; The output shaft shielding cover (31) and the upper cover body (21) are locked by flange screws, and a shielding gasket is installed on the contact surface.

2. The integrated stirring driver according to claim 1, characterized in that: The driving stirrer body (11) can be installed horizontally or vertically inside or outside the reverberation chamber (13).

3. The integrated stirring driver according to claim 1, characterized in that: When the driving stirrer body (11) is installed outside the reverberation chamber (13), it is connected to the reverberation chamber (13) via a flange on the upper cover (21), and a shielding gasket is installed at the connection portion.

4. The integrated stirring driver according to claim 1, characterized in that: The output shaft (3) is a disc cylindrical shaft with an inverted T-shaped cross section.

5. The integrated stirring driver according to claim 1, characterized in that: The control unit comprises a main control board (51), a motor drive unit (54) electrically connected to the main control board (51), an optical zero position detection unit, an optical fiber communication unit (53), and a power filter (56), and the main control board (51) communicates with an external controller via an optical fiber.

6. The integrated stirring driver according to claim 5, characterized in that: The optical zero position detection unit comprises an optical fiber detection head (83) and an optical fiber sensor (52). The optical fiber detection head (83) is arranged in the power unit installation area (8). The optical fiber detection head (83) is connected to the optical fiber sensor (52) via an optical fiber waveguide. The optical fiber detection head (83) is a reflective optical fiber brightness detector.

7. The integrated stirring driver according to claim 1, characterized in that: Shielding gaskets are provided between the needle roller bearing (33), the double-layer plane thrust bearing (32), the upper cover (21), the maintenance window cover (22), and the output shaft (3).

Images