FFC / FPC flat cable structure for direct drive motor

Abstract

The utility model discloses an FFC / FPC flat cable structure used for a direct drive motor, comprising a flexible flat cable main body, the flexible flat cable main body comprises a conductor layer; the metal shielding net wraps the surface of the conductor layer; the insulating protective coating wraps the surface of the metal shielding net; and the insulating layer wraps the surface of the insulating protective coating. According to the utility model, a composite anti-interference protection structure based on the metal shielding net and the insulating coating is adopted, and electromagnetic interference can be effectively shielded, so that the technical problem of serious electromagnetic signal interference in the existing direct-drive motor wiring technology is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a wire arrangement technical field especially is related to a FFC FPC wire arrangement structure for direct drive motor. BACKGROUND

[0002] Direct drive motor (Direct Drive Motor) as a kind of high-precision driving equipment without intermediate transmission mechanism, with transmission efficiency is high, positioning precision is high, running smoothly and other advantages, widely used in industrial robot, precision machine tool, medical equipment, semiconductor equipment and other high-end manufacturing field. Direct drive motor's operation relies on the signal transmission between detection element such as encoder, hall sensor and drive controller, and wiring system as the core carrier of signal transmission, its performance directly influences motor's running stability and control precision.

[0003] FFC (Flexible Flat Cable, flexible flat cable) and FPC (Flexible Printed Circuit, flexible printed circuit board) as a kind of lightweight, flexible transmission carrier, with thin, good flexibility, wiring density is high, anti-interference ability is strong and other advantages, widely used in consumer electronics, automotive electronics and other fields. But existing FFC&FPC product mainly aims at the low-power, short-distance signal transmission design of consumer electronics, cannot directly adapt to the high electromagnetic interference of industrial application scenarios of direct drive motor. UTILITY MODEL CONTENT

[0004] The utility model aims at at least one of the technical problems in the related art to some extent. To this end, one object of the utility model is to provide a FFC / FPC wire arrangement structure for direct drive motor, which adopts a composite anti-interference protection structure based on metal shielding net and insulating coating, can effectively shield electromagnetic interference, thereby solving the technical problem of serious electromagnetic signal interference in existing direct drive motor wiring technology.

[0005] The technical scheme adopted by the utility model is:

[0006] In the first aspect, the utility model provides a FFC / FPC wire arrangement structure for direct drive motor, including flexible wire arrangement main body, wherein the flexible wire arrangement main body includes: conductor layer;Metal shielding net, is wrapped in the conductor layer surface;Insulating protective coating, is wrapped in the metal shielding net surface;Insulating layer, is wrapped in the surface of the insulating protective coating.

[0007] Among them, the metal shielding net adopts tinned copper wire weaving, coverage reaches 95%, the material of the insulating protective coating is polytetrafluoroethylene, the thickness is 0.015mm, and the sealing level is IP67.

[0008] The signal transmission channel of the flexible flat cable body comprises an encoder differential signal channel, a Hall sensor signal channel and a driving control signal channel.

[0009] The material of the encoder differential signal channel is a twisted pair wire, the Hall sensor signal channel adopts a shielded wire, and the driving control signal channel adopts a parallel wire.

[0010] The conductor layer is made of oxygen-free copper and has a thickness of 0.04 mm, and the insulating layer is made of PI material and has a thickness of 0.025 mm.

[0011] The integrated connection terminal comprises a plurality of pins, the terminal seat of the integrated connection terminal is made of high-temperature-resistant nylon material, the elastic contact piece of the integrated connection terminal is made of beryllium copper plated with nickel, the contact resistance of the elastic contact piece is 8 mΩ, and the plug-in life is 1500 times.

[0012] The integrated connection terminal further comprises a buckle type connection structure for adapting to the mounting hole of the motor shell.

[0013] The thickness of the flexible flat cable body is not more than 3 mm.

[0014] The material of the flexible flat cable body is FFC material or FPC material.

[0015] The beneficial effects of the utility model are:

[0016] The anti-interference performance is excellent: the metal shielding net and the insulating coating composite anti-interference protection structure can effectively shield electromagnetic interference, the signal transmission error rate is low (≤ ), the weak signal transmission accuracy of the encoder and the Hall sensor is ensured, the positioning accuracy and the speed control stability of the motor are improved, and the high electromagnetic interference problem in the direct drive motor application scene can be solved.

[0017] The adaptability is strong, and the space utilization rate is high: the thickness of the flexible flat cable is not more than 0.3 mm, and the flexibility is good, the internal structure of the direct drive motor and the complex wiring path can be adapted, the interference with the rotor and the stator is avoided, the internal space utilization rate of the motor is greatly improved, and it is especially suitable for space limited scenes such as hollow shaft direct drive motor.

[0018] The transmission signal types are various: the encoder differential signal, the Hall sensor signal and the driving control signal can be transmitted.

[0019] The transmission signal types are various: the encoder differential signal, the Hall sensor signal and the driving control signal can be transmitted.

[0020] Four, high reliability and long service life: the flexible flat cable adopts wear-resistant, high-temperature-resistant and aging-resistant materials, with a bending life of not less than 3 million times and an integrated connection terminal plug-in life of not less than 1000 times, which greatly reduces the failure rate of short circuit, signal interruption and other faults, and the service life can reach more than 5 years.

[0021] Five, convenient assembly and cost reduction: the integrated connection terminal adopts foolproof design and press buckle connection, without welding, and the assembly efficiency is improved by more than 60%; the standardized flat cable design can realize batch production, reduce the labor cost and material waste of traditional wiring, and reduce the overall production cost by about 30%.

[0022] Six, high temperature resistance: the conductor layer adopts oxygen-free copper, the insulating layer adopts PI material, the metal shielding net adopts tinned copper wire, and the insulating protective coating is made of polytetrafluoroethylene, so that the flat cable structure can be applied to high temperature scenes suitable for direct drive motors.

[0023] Seven: wide application range: it can adapt to different models and power of direct drive motors, support signal transmission of encoder, hall sensor, driving module and other components, and is suitable for high-end manufacturing fields such as industrial robots, precision machine tools, medical devices and semiconductor equipment, with strong universality and practicality. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structure schematic view of the FFC / FPC flat cable structure provided by an embodiment mounted on the direct drive motor;

[0025] Figure 2 is another angle of the structure schematic view of Figure 1 ;

[0026] Figure 3 is another angle of the structure schematic view of Figure 1 ;

[0027] Figure 4 is another angle of the structure schematic view of Figure 1 ;

[0028] Figure 5 is another angle of the structure schematic view of Figure 4 ;

[0029] In the drawings, the various marks are:

[0030] 1-FFC / FPC flat cable structure 1; 2-encoder; 3-direct drive motor; 11-flexible flat cable body; 12-integrated connection terminal. DETAILED DESCRIPTION

[0031] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0032] Please refer to Figures 1 to 5 As Figures 1 to 5 shown, the FFC / FPC flat cable structure 1 comprises a flexible flat cable body 11 and an integrated connection terminal 12.

[0033] The flexible flat cable body 11 comprises a conductor layer, a metal shielding net, an insulating protective coating and an insulating layer. The metal shielding net is wrapped on the surface of the conductor layer, the insulating protective coating is wrapped on the surface of the metal shielding net, and the insulating layer is wrapped on the surface of the insulating protective coating.

[0034] The material of the flexible flat cable body 11 is FFC material or FPC material.

[0035] The metal shielding net is woven with tinned copper wire, and the coverage rate reaches 95%. The material of the insulating protective coating is polytetrafluoroethylene, the thickness is 0.015 mm, and the sealing level is IP67.

[0036] The embodiment adopts a composite anti-interference protection structure based on the metal shielding net and the insulating protective coating, which can effectively shield electromagnetic interference, has excellent anti-interference performance, and has a low signal transmission error rate (≤ ), ensures the weak signal transmission accuracy of the encoder 2 and the Hall sensor, and improves the positioning accuracy and speed control stability of the direct drive motor 3.

[0037] Preferably, the length of the flexible flat cable body is 1.2 m, the width is 15 mm, and the thickness is 0.25 mm. The thickness of the flexible flat cable body is not more than 3 mm, so that the flexible flat cable body has good flexibility.

[0038] Preferably, the signal transmission channel of the flexible flat cable body 11 comprises an encoder differential signal channel, a Hall sensor signal channel and a drive control signal channel. The material of the encoder differential signal channel adopts twisted pair wiring, the Hall sensor signal channel adopts shielded wiring, and the drive control signal channel adopts parallel wiring. Optionally, the signal transmission channel has 12 cores, of which 4 cores are the encoder differential signal channel, 3 cores are the Hall sensor signal channel, and 5 cores are the drive control signal channel.

[0039] The conductor layer adopts oxygen-free copper, and the thickness is 0.04 mm. The thickness of the insulating layer is 0.025 mm, and the material is PI. The insulating layer adopts PI material, which has better wear resistance and fatigue resistance than the existing insulating layer materials such as PVC, and can improve the service life of the flexible flat cable body 11. Moreover, the PI material has excellent high temperature resistance, and the long-term use temperature range is -269°C to 300°C+, and the short-term can withstand high temperature of 400-500°C, so that the FFC / FPC flat cable structure 1 can be applied to high temperature scenes suitable for direct drive motors.

[0040] The number of the integrated connection terminals 12 is two, which are respectively arranged at the two ends of the flexible flat cable body 11.

[0041] The integrated connection terminal 12 is provided with a foolproof positioning protrusion (not marked in the figure), which is matched with the motor-side counter terminal.

[0042] The integrated connection terminal comprises a plurality of pins, the terminal seat of the integrated connection terminal is made of high-temperature-resistant nylon material, the elastic contact piece of the integrated connection terminal is made of beryllium copper plated with nickel, the contact resistance of the elastic contact piece is 8 mΩ, and the plug-in life is 1500 times.

[0043] The integrated connection terminal further comprises a buckle type connection structure (not marked in the figure), which is used for adapting the mounting hole of the motor shell.

[0044] After the embodiment is assembled on an industrial robot joint direct drive motor, it is tested that the signal transmission delay is 8 μs, the encoder signal transmission error rate is 10-6, and the motor positioning accuracy error is less than 0.01°. Under the motor 3000 rpm running state, the signal transmission is stable, there is no interference distortion, the flexible flat cable is not abraded, the connection is not loose, the motor positioning accuracy error is less than 0.01°, and the continuous running time is 1000 hours. , which meets the high-precision driving demand of the industrial robot.

[0045] The above is a specific description of the preferred implementation of the utility model, but the utility model creation is not limited to the embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the utility model, and these equivalent modifications or replacements are all included in the range defined by the claims of the present application.

Claims

1. A FFC / FPC flat cable structure for a direct drive motor, comprising a flexible flat cable body, characterized in that, The flexible flat cable body comprises: a conductor layer; a metal shielding net wrapped on the surface of the conductor layer; an insulating protective coating wrapped on the surface of the metal shielding net; an insulating layer wrapped on the surface of the insulating protective coating.

2. The FFC / FPC flat cable structure according to claim 1, characterized by, The metal shielding net is woven with tinned copper wires, and the coverage rate reaches 95%. The insulating protective coating is made of polytetrafluoroethylene, and has a thickness of 0.015 mm and an IP67 sealing level.

3. The FFC / FPC flat cable structure according to claim 1, characterized by, The signal transmission channel of the flexible flat cable body comprises an encoder differential signal channel, a Hall sensor signal channel and a driving control signal channel.

4. The FFC / FPC flat cable structure according to claim 3, characterized by, The encoder differential signal channel is made of twisted wires, the Hall sensor signal channel is made of shielded wires, and the driving control signal channel is made of parallel wires.

5. The FFC / FPC flat cable structure according to claim 1, characterized by, The conductor layer is made of oxygen-free copper, and has a thickness of 0.04 mm. The insulating layer has a thickness of 0.025 mm and is made of PI material.

6. The FFC / FPC flat cable structure according to claim 1, characterized by, Further comprising: integrated connection terminals, the number of the integrated connection terminals is two, and the integrated connection terminals are arranged at two ends of the flexible flat cable body respectively, the integrated connection terminals are provided with fool-proof positioning protrusions, and the fool-proof positioning protrusions are matched with the butt joint terminals on the motor side.

7. The FFC / FPC flat cable structure according to claim 6, characterized by, The integrated connection terminals comprise a plurality of pins, the terminal seat of the integrated connection terminals is made of high-temperature-resistant nylon material, the elastic contact piece of the integrated connection terminals is made of beryllium copper plated with nickel, the contact resistance of the elastic contact piece is 8 mΩ, and the plug-in life is 1500 times.

8. The FFC / FPC flat cable structure according to claim 6, characterized by, The integrated connection terminals further comprise a buckle type connection structure for adapting to the mounting hole of the motor shell.

9. The FFC / FPC cable structure according to any one of claims 1 to 8, characterized by, The thickness of the flexible flat cable body is not more than 3 mm.

10. The FFC / FPC cable structure according to any one of claims 1 to 8, characterized by, The material of the flexible flat cable body is FFC material or FPC material.

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