Three-Axis Gimbal Cable Routing Through Hollow Motor Shafts
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Solution Overview
Problem
Conventional gimbals face issues with wire winding and scraping due to flexible printed circuit boards, leading to reduced service life and limited connection buses and rotation angles, especially in multi-axis systems, which restrict high-speed signal transmission and increase thickness.
Innovation Solution
The three-axis gimbal design incorporates conductive wires that pass through hollow motor shafts and are arranged within the support arms, using coaxial wires and board-to-board connectors to prevent wire winding and scraping, enabling compact and reliable high-speed data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flexible printed circuit board is wound on motor shaft surface, then connection between motor and control part is achieved, but winding space increases and motor thickness increases
Solution Approach 1:
The flexible printed circuit board is extracted from the motor shaft surface and routed through the hollow interior of the motor shaft. This removes the winding space requirement from the motor exterior, reducing motor thickness while maintaining reliable electrical connection between the rotating body and control part.
Solution Approach 2:
The flexible printed circuit board is nested within the hollow motor shaft, utilizing the internal space of the motor structure. This nesting approach eliminates the need for external winding space, thereby reducing motor thickness while preserving connection functionality.
2Reliability
If flexible printed circuit board is used for signal transmission, then connection is established, but transmission rate is limited due to board process
Solution Approach 1:
The patent changes the physical form parameter of the connection medium from a planar flexible printed circuit board to a three-dimensional cable assembly that can be routed through the motor shaft. This parameter change enables higher signal transmission rates while maintaining reliable electrical connections throughout the gimbal system.
3Volume of moving object
If connection bus is arranged directly from outer part to control part without passing through motor, then motor thickness is reduced, but number of connection buses and rotation angles are limited causing winding or scraping
Solution Approach 1:
The hollow motor shaft serves as an intermediary structure that accommodates and protects the flexible printed circuit board during rotation. This intermediary approach allows the connection bus to pass through the motor shaft interior rather than being exposed externally, preventing winding and scraping while maintaining adequate rotation angles and extending service life.
4Ease of operation
If flexible printed circuit board is exposed outside support arm and coupled to camera, then connection is simplified, but wire winding and scraping occur reducing service life
Solution Approach 1:
The flexible printed circuit board is extracted from the external support arm environment and routed through the protected interior of the hollow motor shaft. This extraction removes the board from the harmful external rotation environment, preventing winding and scraping while maintaining connection functionality to the camera and control systems.
Data Source
Figure 1~2
Figure 3~4
AI summary
A three-axis gimbal and three-axis gimbal photographing apparatus are provided. A the first electromechanical coupling apparatus (12) of the three-axis gimbal includes a first hollow motor shaft (121). The first hollow motor shaft (121) has a first accommodation cavity (120). A second electromechanical coupling apparatus (22) includes a second hollow motor shaft (221). The second hollow motor shaft (221) has a second accommodation cavity 220). A pitch axis arm (21) includes a pitch axis accommodation cavity (210), A roll axis component (1) includes a first conductive wire (13) configured in the first accommodation cavity (120) and the roll axis arm accommodation cavity (110). A pitch axis component (2) includes a second conductive wire (23) configured in the second accommodation cavity (220) and the pitch axis arm accommodation cavity (210). The first conductive wire (13) is connected to the second conductive wire (23).