Two-Degree-of-Freedom Rotation Control Device
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Solution Overview
Problem
Current two-degree-of-freedom rotation control devices face challenges in miniaturization due to large volume, high manufacturing complexity and cost, and poor rigidity, primarily attributed to the gimbal frame structure and nested mechanical design.
Innovation Solution
A two-degree-of-freedom rotation control device featuring a rotating body with a friction spherical surface and a standing wave type piezoelectric ceramic motor, where the motor's driving end is in direct contact with the spherical surface, allowing for friction transmission and enabling precise control of rotational degrees of freedom with reduced complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gimbal frame structure with two orthogonal rotating shafts is used, then the device can achieve two-degree-of-freedom rotation control, but the device volume becomes large and miniaturization becomes difficult
Solution Approach 1:
The patent merges two separate rotating shafts and their associated motors into a single integrated spherical structure. One motor drives rotation around the first axis, while the same motor and spherical mechanism enable rotation around the second axis through spherical coordinate transformation, eliminating the need for separate orthogonal shafts and reducing overall device volume
Solution Approach 2:
The patent employs a spherical rotating body instead of traditional rectangular gimbal frames. The spherical geometry allows the rotating body to achieve two-degree-of-freedom rotation through spherical coordinates (azimuth and elevation angles), enabling compact design while maintaining full rotational capability in three-dimensional space
2Manufacturing precision
If two orthogonal rotating shafts with precisely perpendicular alignment are required, then accurate two-degree-of-freedom rotation is achieved, but the mechanical structure becomes complex and manufacturing cost increases
Solution Approach 1:
The spherical rotating body inherently eliminates the need for precise perpendicular alignment between two separate shafts. By using spherical coordinates (azimuth angle and elevation angle) to define orientation, the system achieves accurate two-degree-of-freedom rotation control without requiring complex mechanical alignment, thereby simplifying the overall mechanical structure and reducing manufacturing costs
3Ease of operation
If a gimbal frame structure is used, then the device can support rotating components, but the overall rigidity becomes poor and performance becomes unstable
Solution Approach 1:
The patent combines the functions of multiple support structures into a single spherical rotating body that integrates both rotation axes. This unified structure eliminates the flexibility and instability inherent in traditional gimbal frame assemblies with multiple separate shafts and bearings, providing superior structural rigidity while maintaining full two-degree-of-freedom rotation capability
Solution Approach 2:
The spherical geometry provides inherent structural rigidity and stability. The spherical rotating body acts as a rigid monolithic structure that resists deformation better than articulated gimbal frames, while the spherical coordinate system (azimuth and elevation angles) enables precise control of orientation without compromising structural integrity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design achieves a compact, cost-effective, and highly rigid solution with improved dynamic performance, low power consumption, and high precision, facilitating miniaturization and efficient dynamic stabilization.
Implementation Method 1
a driving motor, wherein, a driving end of the driving motor is in direct contact with the friction spherical surface of the rotating body
Implementation Method 2
a driving end of the driving motor is in direct contact with the friction spherical surface of the rotating body, to form a friction transmission pair tangent to the friction spherical surface
Data Source
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Figure 5
AI summary
Disclosed are a two-degree-of-freedom rotation control device and an application system, comprising a rotary body (1) provided with a rubbing spherical surface, wherein a load mounting platform is arranged at the top or in the interior of the rotary body (1); a fixed supporting structure which holds the rotary body (1) to make the rotary body (1) only have a rotary degree of freedom; driving motors (7) which are standing wave type piezoelectric ceramic motors, wherein the driving motors (7) are longitudinally distributed at the periphery of the rotary body (1), and driving ends of the driving motors are in direct contact with the rubbing spherical surface of the rotary body (1) so as to form a longitudinal rubbing transmission pair tangent to the rubbing spherical surface; and a control unit for controlling and regulating rotation of the rotary body (1) in two rotary degrees of freedom according to attitude data measured by a detection unit. The device has a simple structure, low costs and a stable performance, is easily miniaturized, has a wider dynamic response and smaller power consumption and can be widely applied to various types of dynamic stable platforms and automatic static orientation/levelling devices.