Linear DC Motor Cylindrical Coil Rigidity
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Solution Overview
Problem
The existing linear DC motors used for positioning lenses suffer from reduced rigidity and responsiveness due to deformation of the rectangular coil assembly when moving components, leading to reduced precision and durability.
Innovation Solution
A linear DC motor design featuring cylindrical drive coils and magnets disposed symmetrically about a motor center axis, with a detection unit and linear guide positioned to balance the sliding member, preventing excessive stress and ensuring high rigidity and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If components are installed inside the rectangular coil assembly, then the coil assembly can support all necessary components, but the coil assembly becomes relatively large and its rigidity is reduced
Solution Approach 1:
The invention divides the system into two separate parts: the coil assembly and the sliding member. The coil assembly contains only the coil, while the sliding member contains the lens frame, sensor, and other components. This segmentation allows each part to be optimized independently - the coil assembly can be made compact and rigid, while the sliding member can be designed to hold all necessary components without affecting coil assembly rigidity.
Solution Approach 2:
The invention transitions from a two-dimensional rectangular coil assembly to a three-dimensional cylindrical coil assembly. This dimensional change allows the coil to be wound in a circular pattern around a coil center axis, providing more uniform structural support and significantly improving rigidity in all radial directions while maintaining a compact form factor.
2Ease of operation
If the rectangular coil assembly is used to generate thrust, then the coil assembly can move the lens frame, but the rectangular coil assembly deforms without resisting the thrust
Solution Approach 1:
The invention replaces the rectangular coil assembly with a cylindrical coil assembly where the coil is wound in a circular pattern. This curved, symmetric structure provides uniform resistance to thrust forces from all directions, preventing deformation that occurs in rectangular structures under lateral loads. The cylindrical shape naturally distributes stress evenly around the coil center axis.
3Productivity
If the coil assembly deforms while moving the movable element, then the movable element can be actuated, but a slight delay occurs in the movement and responsiveness is reduced
Solution Approach 1:
The cylindrical coil assembly with its circular winding pattern provides structurally stable support that does not deform under thrust loads. This eliminates the slight delays in movement that occur when a rectangular coil assembly deforms, thereby improving the responsiveness and speed of the movable element actuation.
4Adaptability or versatility
If the rectangular coil assembly is used, then the components can be arranged inside, but resonance is generated in the coil assembly and positioning precision is reduced
Solution Approach 1:
By separating the coil assembly from the component-holding sliding member, the invention eliminates the rectangular structure that causes resonance. The cylindrical coil assembly has different vibrational characteristics that reduce resonance generation, while the sliding member can still accommodate all necessary components through its separate design.
Solution Approach 2:
The cylindrical shape of the coil assembly with its circular coil winding provides superior resistance to resonance compared to rectangular structures. The curved geometry distributes vibrational forces more evenly, reducing resonance peaks that would otherwise degrade positioning precision.
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 design enhances the motor's responsiveness and precision by aligning the center of thrust with the center of gravity, reducing stress on the linear guide and improving durability.
Implementation Method 1
a motor stator (13) comprising a first drive magnet (14) and a second drive magnet (15) for causing magnetic drive force to be generated between the first and second drive coils (11, 12)
Data Source
AI summary
A linear DC motor having first and second drive coils and first and second drive magnets arranged in a symmetrical state in relation to a motor central axis that passes through a sliding member in which a lens is mounted. The first and second coils on a moveable side are positioned to both the left and right sides of the sliding member. The first and second drive coils are designed to be independent without being affected by the shape, size, arrangement position, and the like of the sliding member, a linear guide, and a detection part. The first and second drive coils have high rigidity and do not deform when the sliding member slides. Accordingly, it is possible to obtain a linear DC motor that has a highly rigid moveable part and performs positioning action with high responsiveness and high precision.