Gimbal Motor Mechanical Limiting Ring for 720° Yaw Rotation
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Solution Overview
Problem
Existing mechanical limiting devices for gimbals restrict the rotation angle of the yaw axis to 360°, which is insufficient for advanced applications, and software-based solutions require high stability and control to prevent motor malfunction and cable damage.
Innovation Solution
A motor mechanical limiting device comprising a limiting ring, first and second limiting devices, where the first device is fixed on the rotor and the second on the stator, with a stopping edge and connecting rods allowing the rotation to exceed 360° by enabling the limiting ring to rotate beyond the initial 360°, ensuring a total rotation range of 0° to 720°.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional mechanical limiting device is used with a stop member fixed on the stator and a limiting member fixed on the rotor, then the rotation angle is limited to 360°, but this prevents achieving larger rotation angles required for advanced gimbal applications
Solution Approach 1:
The limiting device is divided into two independent limiting members (first and second limiting members) that can be separately positioned on the rotor and stator. This segmentation allows the rotation path to be extended beyond 360° by creating multiple limiting zones, thereby increasing the rotation angle range without requiring a complete redesign of the limiting mechanism.
Solution Approach 2:
The limiting ring is designed to rotate together with the rotor, creating a nested structure where the limiting ring is positioned within the rotor assembly. This nested configuration allows the limiting function to be integrated into the existing rotor-stator structure, extending the rotation angle beyond 360° while avoiding significant increases in device complexity.
2Reliability
If software limiting is used to preset the maximum rotation angle, then the motor stops immediately upon reaching the limit, but this requires 100% stability on control programs and risks cable breakage if control fails
Solution Approach 1:
The mechanical limiting device provides a physical safety mechanism that acts as a backup to software control. The limiting members are pre-positioned to physically prevent the rotor from exceeding the maximum rotation angle, creating a cushioning effect that protects against control failures. This mechanical safeguard ensures reliability even when software control stability cannot be guaranteed at 100%.
3Adaptability or versatility
If the limiting ring is in bearing connection with the rotor and allows rotation beyond 360°, then the rotation angle exceeds 360°, but this requires precise positioning of limiting devices on the rotation path
Solution Approach 1:
By dividing the limiting function into two separate limiting members positioned at different locations on the rotation path, the precision requirement for each individual limiting member is reduced. Each limiting member only needs to be positioned accurately at its specific location, rather than requiring a single complex limiting mechanism to accommodate the entire extended rotation range.
Data Source
AI summary
The present application discloses a motor mechanical limiting device for limiting rotation of a motor. The device includes: a limiting ring, a first limiting device, and a second limiting device. The first limiting device is fixedly connected on a rotor of motor. The second limiting device is fixed on a motor stator. The limiting ring is in bearing connection with the rotor of motor. The limiting ring protrudes to form a stopping edge. Both the first limiting device and the second limiting device are located on a circumferential rotation path of the stopping edge, and the second limiting device is provided with a region for the first limiting device to pass through.