Three-Axis Voice Coil Motor With Selective Coil Activation
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Solution Overview
Problem
Current multi-degree-of-freedom motor systems, such as robotic arms and lenses, are bulky, inefficient, and suffer from slow response speeds and inaccurate positioning due to the combination of multiple one-degree-of-freedom motors, and voice coil motors face power waste and control issues when rotating at large angles.
Innovation Solution
A three-axis voice coil motor design with X-coil, Y-coil, and Z-coil groups, each with gaps, allowing for efficient power distribution and magnetic field optimization to achieve high-efficiency rotation by selectively powering coils based on magnetic field strength, thereby enhancing electromagnetic efficiency and multi-degree-of-freedom control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple one-degree-of-freedom motors are combined to achieve multi-degree-of-freedom control, then multi-degree-of-freedom movement is attained, but the mechanism becomes bulky with low operating efficiency, slow response speed, and inaccurate positioning
Solution Approach 1:
The patent merges multiple one-degree-of-freedom motors into a single integrated three-axis voice coil motor that provides multi-degree-of-freedom control. The magnetic component with multiple coil groups (X-coil group, Y-coil group, Z-coil group) enables simultaneous control along three orthogonal axes, eliminating the need for separate motors and reducing mechanical complexity while maintaining full 3D movement capability
Solution Approach 2:
The voice coil motor structure serves multiple functions simultaneously: it provides driving force in three orthogonal directions, enables multi-degree-of-freedom rotation, and achieves precise positioning. The single motor unit performs what previously required multiple specialized motors, improving operational efficiency and response speed while maintaining versatile control capabilities
2Length of moving object
If a voice coil motor rotates at a large angle, then rotation stroke is increased, but coils with no magnetic field passing through cannot be used resulting in power waste and hindering control
Solution Approach 1:
The patent segments the coil system into multiple independent coil groups oriented along different axes (X-coil group, Y-coil group, Z-coil group). Each coil group can be independently controlled and activated based on the required rotation direction and magnitude. This segmentation allows the motor to maintain high efficiency at large rotation angles by activating only the relevant coil groups that have magnetic field interaction, rather than wasting power in all coils
Solution Approach 2:
The motor employs dynamic coil activation where the control system selectively powers specific coil groups based on real-time operational requirements. When rotating at large angles, only the coil groups with effective magnetic field interaction are activated, while others remain inactive. This dynamic adaptation optimizes energy consumption across the full range of motion, preventing power waste while maintaining extended rotation stroke capability
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
The three-axis voice coil motor achieves increased rotation stroke and efficiency by optimizing power supply to coils, reducing power waste, and enabling precise multi-degree-of-freedom control, improving response speed and accuracy.
Implementation Method 1
When a current is supplied to the X-coil group, the Y-coil group, or the Z-coil group and when a magnetic field of the magnetic component is propagated to the X-coil group, the Y-coil group, or at least one Z-coil group, a corresponding Lorentz force may be generated to drive the magnetic component to rotate
Data Source
AI summary
A three-axis voice coil motor including a base, a spherical bearing, a magnetic component, an X-coil group, a Y-coil group, and at least one Z-coil group is provided. The base has a supporting pole. The spherical bearing is rotatably sleeved around the supporting pole. The magnetic component is securely sleeved around the spherical bearing and the magnetic component rotates along with the spherical bearing. The X-coil group is disposed around the magnetic component along an X-axial direction passing through the spherical bearing, and the X-coil group has first gaps. The Y-coil group is disposed around the magnetic component along a Y-axial direction passing through the spherical bearing, and the Y-coil group has second gaps. The Z-coil group is disposed around the magnetic component along a Z-axial direction passing through the spherical bearing.