Linear Motor Coil Yoke for Compact Three-Axis Control
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Solution Overview
Problem
Conventional conveyance apparatuses with movable magnet type linear motors require multiple rows of coils and magnets for two-axis driving, resulting in a large configuration and increased costs.
Innovation Solution
A conveyance apparatus with a stator comprising a plurality of coils along a first direction and a mover with magnet groups facing the coils, where at least one coil includes a core, a wire-wound portion, and a yoke adjacent to the wire-wound portion, allowing for three-axis control with reduced coil rows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two types of coils and two rows of magnets are used to perform two-axis driving, then two-axis driving capability is achieved, but the apparatus size and cost increase
Solution Approach 1:
The patent merges the functions of two types of coils into a single coil structure. The single coil is configured to generate electromagnetic forces in both the conveyance direction (X-axis) and the perpendicular direction (Y-axis) by utilizing two magnet groups with different polarities arranged on the mover. This eliminates the need for separate coil rows and reduces overall apparatus size while maintaining two-axis driving capability.
Solution Approach 2:
The single coil in the patent serves multiple functions: it generates electromagnetic force in the conveyance direction when current flows through it, and simultaneously generates electromagnetic force in the perpendicular direction by interacting with the two magnet groups. This multi-functional design allows one coil to replace what would traditionally require two separate coil systems.
2Adaptability or versatility
If two types of coils and two rows of magnets are used to perform two-axis driving, then two-axis driving capability is achieved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple coil functions into a single coil assembly, reducing the total number of coils that need to be manufactured, installed, and wired. This merging of functions directly reduces material costs, assembly costs, and maintenance costs while preserving the full two-axis driving capability.
Solution Approach 2:
The single coil is designed to perform multiple functions that would traditionally require separate components. By making the coil universal in its function, the patent reduces the bill of materials and simplifies the manufacturing process, thereby lowering overall production costs.
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
Enables efficient three-axis control and orientation of the mover with a reduced number of coil rows, minimizing system size and cost while maintaining effective conveyance and orientation capabilities.
Implementation Method 1
a stator including a plurality of coils arranged along a first direction, and a mover configured to move along the plurality of coils
Implementation Method 2
a first magnet group including a plurality of first magnets arranged to face the plurality of coils along the first direction, and a second magnet group including a plurality of second magnets arranged to face the plurality of coils along a second direction intersecting with the first direction
Data Source
AI summary
A conveyance apparatus includes a stator including a plurality of coils arranged along a first direction and a mover. The mover moves along the plurality of coils and includes a first magnet group including a plurality of first magnets arranged to face the plurality of coils along the first direction, and a second magnet group including a plurality of second magnets arranged to face the plurality of coils along a second direction intersecting with the first direction. At least one of the plurality of coils includes a core, a wire-wound portion wound around the core, and a yoke. The yoke is adjacent to an outer periphery of a portion of the wire-wound portion along the first direction and extends in the first direction.