Electrical rotary connection device for a low electromagnetic noise turntable

Abstract

An electrical rotary connection device for a low electromagnetic noise rotary table, comprising a power connection device and a signal connection device connected to each other, the power connection device comprising a coaxially installed power shell, a power support, a power ring assembly, a power brush assembly; the signal connection device comprising a coaxially installed signal shell, an isolation cover, a signal support, a signal ring assembly, a signal brush assembly; a stator power cable with one end connected to the power brush assembly is arranged between the power shell and the power support, the inside of the isolation cover is provided with a stator signal cable with one end connected to the signal brush assembly, the inside of the power ring assembly is provided with a rotor power cable with one end connected to each ring channel in the power ring assembly, and the inside of the signal ring assembly is provided with a rotor signal cable with one end connected to each ring channel in the signal ring assembly. The present application can solve the interference problem of the strong and weak current integrated electrical rotary connection device caused by sharing the same ring assembly and brush assembly.

Description

Technical Field

[0001] This invention relates to an electrical rotary connection device for a low electromagnetic noise turntable. Background Technology

[0002] Electrical rotary connection devices provide continuous power and signal transmission channels for rotating equipment. In conventional electrical rotary connection devices, the power and signal channels are located in the same compartment, with strong and weak currents mixed together. At low power, the coupling interference between them is not obvious. However, when the power transmission is high-power and high-frequency, especially in high-power simulation turntables, the PWM driver used has a large current change rate di / dt and voltage change rate du / dt in the power channel due to the rapid turn-on and turn-off of the main switching device of the power drive circuit. The switching voltage and current contain rich high-order harmonics. These high-frequency components are coupled to the signal channel through parasitic capacitance and common impedance, causing abnormal operation of the turntable and the test object. Summary of the Invention

[0003] The purpose of this invention is to provide an electrical rotary connection device for a low electromagnetic noise turntable to solve the problems mentioned in the background art. It can effectively reduce the interference of power connection devices on signal connection devices and is particularly suitable for equipment such as simulation turntables that need to transmit high-power power and signals.

[0004] The technical solution adopted to achieve the above objectives is an electrical rotary connection device for a low electromagnetic noise turntable, comprising a power connection device and a signal connection device interconnected with each other. The power connection device includes a power housing, a power support, a power ring assembly, and a power brush assembly coaxially mounted. The signal connection device includes a signal housing, an isolation cover, a signal support, a signal ring assembly, and a signal brush assembly coaxially mounted. A stator power cable with one end connected to the power brush assembly is provided between the power housing and the power support. A stator signal cable with one end connected to the signal brush assembly is provided inside the isolation cover. A rotor power cable with one end connected to each ring in the power ring assembly is provided inside the power ring assembly. A rotor signal cable with one end connected to each ring in the signal ring assembly is provided inside the signal ring assembly.

[0005] Furthermore, the power housing is fixedly connected to the signal housing, the power bracket is connected to the signal bracket by screws, one end of the stator power cable is placed in the outer cavity formed between the signal housing and the isolation cover, and the other end of the stator power cable is connected to the power brush assembly; one end of the rotor power cable is connected to each ring in the power ring assembly, and the other end of the rotor power cable is led out through multiple power cable outlets opened on the power ring assembly.

[0006] Furthermore, the power ring assembly is connected to the signal ring assembly, the stator signal cable is placed in the cavity formed between the isolation cover and the signal ring assembly, one end of the stator signal cable is connected to the signal brush assembly, and the other end of the stator signal cable is led out from the end of the signal bracket; one end of the rotor signal cable is connected to each ring in the signal ring assembly, and the other end of the rotor signal cable is led out through the inner hole in the signal ring assembly.

[0007] Furthermore, the power housing, signal housing, power bracket, signal bracket, and isolation cover are made of aluminum to reduce electromagnetic noise inside the device.

[0008] Furthermore, the stator power cable, stator signal cable, rotor power cable, and rotor signal cable all include multiple sets of twisted-pair shielded wires with insulating sheaths; each set of twisted-pair shielded wires has two twisted-pair wires connected to adjacent brush filaments in the brush assembly or adjacent loops in the loop assembly, and a wire shielding layer is provided on the outside of the twisted-pair wires; the shielding layer in the twisted-pair shielded wires adopts a "loop-occupying" design, which means setting a dedicated shielding channel to connect the wire shielding layer, so that the entire cable constitutes a fully shielded structure and reduces electromagnetic leakage. Beneficial effects

[0009] Compared with the prior art, the present invention has the following advantages.

[0010] This invention can reasonably and effectively solve the interference problem caused by the shared ring body assembly and brush assembly in integrated strong and weak current slip rings. Compared with the single-axis double slip ring method, it greatly reduces the complexity of the structure and has a more obvious interference suppression effect. Attached Figure Description

[0011] The present invention will be further described in detail below with reference to the accompanying drawings.

[0012] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0013] Figure 2 This is a schematic diagram of the slip ring partition routing in this invention;

[0014] Figure 3 This is a schematic diagram of the cable connection structure in this invention;

[0015] Figure 4 This is the present invention. Figure 3 A schematic diagram of the cable connection principle at point A. Detailed Implementation

[0016] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0017] like Figures 1-4As shown, an electrical rotary connection device for a low electromagnetic noise turntable includes a power connection device 1 and a signal connection device 2 connected to each other. The power connection device 1 includes a power housing 14, a power support 11, a power ring assembly 13, and a power brush assembly 12, all mounted coaxially. The signal connection device 2 includes a signal housing 25, an isolation cover 24, a signal support 22, a signal ring assembly 21, and a signal brush assembly 23, all mounted coaxially. A stator power cable 3, with one end connected to the power brush assembly 12, is provided between the power housing 14 and the power support 11. A stator signal cable 4, with one end connected to the signal brush assembly 23, is provided inside the isolation cover 24. A rotor power cable 6, with one end connected to each ring track in the power ring assembly 13, is provided inside the signal ring assembly 21. A rotor signal cable 5, with one end connected to each ring track in the signal ring assembly 21, is provided inside the signal ring assembly 21.

[0018] The power housing 14 is fixedly connected to the signal housing 25, the power bracket 11 is connected to the signal bracket 22 by screws, one end of the stator power cable 3 is placed in the outer cavity formed between the signal housing 25 and the isolation cover 24, and the other end of the stator power cable 3 is connected to the power brush assembly 12; one end of the rotor power cable 6 is connected to each ring in the power ring assembly 13, and the other end of the rotor power cable 6 is led out through multiple power cable outlets 7 opened on the power ring assembly 13.

[0019] The power ring assembly 13 is connected to the signal ring assembly 21. The stator signal cable 4 is placed in the cavity formed between the isolation cover 24 and the signal ring assembly 21. One end of the stator signal cable 4 is connected to the signal brush assembly 23, and the other end of the stator signal cable 4 is led out from the end of the signal bracket 22. One end of the rotor signal cable 5 is connected to each ring in the signal ring assembly 21, and the other end of the rotor signal cable 5 is led out through the inner hole in the signal ring assembly 21.

[0020] The power housing 14, signal housing 25, power bracket 11, signal bracket 22, and isolation cover 24 are made of aluminum material to reduce electromagnetic noise inside the device.

[0021] The stator power cable 3, stator signal cable 4, rotor power cable 6, and rotor signal cable 5 all include multiple sets of twisted-pair shielded wires 8 with insulating sheaths to reduce electromagnetic coupling, common-mode interference, and external transmission interference. Each set of twisted-pair shielded wires 8 has two twisted-pair wires 9 connected to adjacent brush filaments 15 in the brush assembly or adjacent loops 16 in the loop assembly. A wire shielding layer 10 is provided on the outside of the twisted-pair wires 9. The shielding layer 10 in the twisted-pair shielded wires 8 adopts a "loop-occupying" design. The "loop-occupying" design means that a dedicated shielding channel 17 is set to connect the wire shielding layer 10. The wire shielding layer 10 includes a stator wire shielding layer and a rotor wire shielding layer, so that the entire cable constitutes a fully shielded structure and reduces electromagnetic leakage.

[0022] In this invention, the stator of the power connection device 1 and the stator of the signal connection device 2 are fixed by screw connection, and the rotor is driven by a boss and a concave hole transmission method, thereby realizing the combined transmission of the two rotating devices.

[0023] The power connection device 1 includes a power bracket 11, a power brush assembly 12, a power ring assembly 13, and a power housing 14. The power bracket 11 and the power ring assembly 13 are supported by bearings to achieve mutual rotation, and the power brush assembly 12 completes the dynamic-static conversion for signal transmission.

[0024] The signal connection device 2 includes a signal ring assembly 21, a signal bracket 22, a signal brush assembly 23, an isolation cover 24, and a signal housing 25. The signal bracket 22 and the signal ring assembly 21 are supported by bearings to achieve mutual rotation. The signal transmission is completed by the signal brush assembly 23 to switch between static and dynamic states. Meanwhile, the isolation cover is made of aluminum material and is installed on the signal bracket 22 to form two independent shielding cavities.

[0025] The stator power cable 3 is connected to the power brush assembly 12 through the outer cavity formed between the isolation cover 24 and the signal housing 25. After signal conversion, the rotor power cable 6 is led out through multiple power cable outlets 7 provided on the power ring assembly 13. The stator signal cable 4 is connected to the signal brush assembly 23 through the inner cavity formed by the isolation cover 24. After signal conversion, the rotor signal cable 5 is led out through the inner hole provided in the signal ring assembly 21. This achieves the partitioning and separate routing of the power channel and signal channel, making the power channel and signal channel independent of each other.

[0026] The cables used inside the power connection device 1 and signal connection device 2 all employ multiple sets of insulated twisted-pair shielded wires 8 to reduce electromagnetic coupling, common-mode interference, and external transmission interference. In each set of twisted-pair shielded wires 8, two twisted-pair wires 9 must be connected to adjacent brush filaments 15 in the brush assembly or adjacent loops 16 in the loop assembly. The shielding layers 10 of the twisted-pair shielded wires 8 all adopt a "loop-occupying" design. This design involves setting up a dedicated shielding channel 17 to connect the stator wire shielding layer and the rotor wire shielding layer, making the entire wire a fully shielded structure and reducing electromagnetic leakage.

[0027] This invention overcomes the shortcomings of integrated strong and weak current slip rings that share the same ring body assembly and brush assembly. It adopts a partitioned arrangement and isolated outgoing lines for power channels and signal channels, making the power channels and signal channels independent of each other. Furthermore, each group of conductors uses twisted-pair shielded conductors with insulating sheaths and its shielding layer is treated with "ring occupation", which can effectively reduce the interference of the power ring to the signal connection device. It is particularly suitable for equipment such as simulation turntables that need to transmit high-power power and signals.

Claims

1. An electrical rotary connection device for a low electromagnetic noise turntable, comprising a power connection device (1) and a signal connection device (2) interconnected, characterized in that, The power connection device (1) includes a power housing (14), a power bracket (11), a power ring assembly (13), and a power brush assembly (12) mounted coaxially; the signal connection device (2) includes a signal housing (25), an isolation cover (24), a signal bracket (22), a signal ring assembly (21), and a signal brush assembly (23) mounted coaxially; a stator power cable (3) with one end connected to the power brush assembly (12) is provided between the power housing (14) and the power bracket (11); a stator signal cable (4) with one end connected to the signal brush assembly (23) is provided inside the isolation cover (24); a rotor power cable (6) with one end connected to each ring in the power ring assembly (13) is provided inside the power ring assembly (13); and a rotor signal cable (5) with one end connected to each ring in the signal ring assembly (21) is provided inside the signal ring assembly (21). One end of the stator power cable (3) is placed in the outer cavity formed between the signal housing (25) and the isolation cover (24), and the other end of the stator power cable (3) is connected to the power brush assembly (12); one end of the rotor power cable (6) is connected to each ring in the power ring assembly (13), and the other end of the rotor power cable (6) is led out through multiple power cable outlets (7) opened on the power ring assembly (13); The stator signal cable (4) is placed in the cavity formed between the isolation cover (24) and the signal ring assembly (21). One end of the stator signal cable (4) is connected to the signal brush assembly (23), and the other end of the stator signal cable (4) is led out from the end of the signal bracket (22). One end of the rotor signal cable (5) is connected to each ring in the signal ring assembly (21), and the other end of the rotor signal cable (5) is led out through the inner hole in the signal ring assembly (21). The stator power cable (3), stator signal cable (4), rotor power cable (6), and rotor signal cable (5) all include multiple sets of twisted-pair shielded wires (8) with insulating sheaths; the shielding layer (10) in the twisted-pair shielded wire (8) adopts a "loop-occupying" design, which means setting up a dedicated shielding channel (17) to connect the wire shielding layer (10), so that the entire cable forms a fully shielded structure and reduces electromagnetic leakage.

2. The electrical rotary connection device for a low electromagnetic noise turntable according to claim 1, characterized in that, The power housing (14) is fixedly connected to the signal housing (25), and the power bracket (11) is connected to the signal bracket (22) by screws.

3. The electrical rotary connection device for a low electromagnetic noise turntable according to claim 1, characterized in that, The power ring assembly (13) is connected to the signal ring assembly (21).

4. The electrical rotary connection device for a low electromagnetic noise turntable according to claim 1, characterized in that, The power housing (14), signal housing (25), power bracket (11), signal bracket (22), and isolation cover (24) are made of aluminum material to reduce electromagnetic noise inside the device.

5. The electrical rotary connection device for a low electromagnetic noise turntable according to claim 1, characterized in that, Each set of twisted-pair shielded wires (8) has two twisted-pair wires (9) that are connected to adjacent brush filaments (15) in the brush filament assembly or adjacent loops (16) in the loop assembly. A wire shielding layer (10) is provided on the outside of the twisted-pair wires (9).

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