Planar Motor Coil Array Layout for Lower Current Positioning
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Solution Overview
Problem
Existing planar motor displacement devices face limitations in space ratio of conductor material, leading to reduced motor power and increased current requirements, which in turn raises costs due to the need for more powerful current amplifiers.
Innovation Solution
The planar motor displacement device incorporates a coil array with double-layer structures where each coil is wound with multiple turns, allowing current to flow between layers, reducing current per turn and minimizing the need for high-power amplifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a planar motor is used for high-precision positioning, then positioning precision is improved, but the risk of head collision with the rear end stop increases
Solution Approach 1:
The patent introduces a Z-axis dimension by tilting the rear end stop relative to the X-Y movement plane. This dimensional change allows the rear end stop to be positioned at a different height level, creating vertical clearance that prevents head collision while maintaining high-precision X-Y positioning capability.
2Device complexity
If the rear end stop is positioned in the X-Y movement plane, then the structure is simple, but the motor head may collide with it
Solution Approach 1:
The rear end stop is tilted at an angle theta (0 < theta < 90 degrees) relative to the X-Y movement plane, positioning part of the stop structure in the Z-axis dimension. This dimensional transition prevents collision by elevating the critical stop surface above the motor head's movement path while maintaining structural efficiency.
3Length of moving object
If a long stroke is required for the planar motor, then the movement range is increased, but the positioning precision may be compromised
Solution Approach 1:
The patent segments the positioning function into two independent parts: the planar motor handles high-precision X-Y positioning with limited stroke, while the linear motor provides the extended Z-axis stroke capability. This segmentation allows each motor to operate within its optimal performance range, maintaining precision while achieving long overall stroke.
Solution Approach 2:
The hybrid motor system combines two different motor types (planar motor and linear motor) to achieve multi-functionality: the planar motor provides precise lateral positioning, while the linear motor provides extended vertical travel. Together they fulfill both long stroke and high precision requirements that a single motor type cannot achieve alone.
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 effectively increases the space ratio of conductor material, reducing current requirements and controlling costs by optimizing coil configuration and current flow.
Implementation Method 1
When a planar motor is used, high positioning precision can be achieved
Implementation Method 2
a linear motor is connected to the moving object in a state of suspension to move the moving object in a direction (a Z-axis direction)
Data Source
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AI summary
The present invention discloses a planar motor displacement device, which at least includes a stator and a mover, the stator at least includes a magnet array, which extends on a first plane parallel to a direction X and a direction Y to form a working area, the mover at least includes a coil array, the coil array of the mover is arranged on a second plane parallel to the first plane. The coil array at least includes an X coil array and a Y coil array; the X coil array at least includes three X coils of the same size; the Y coil array at least includes three Y coils of the same size. Each X coil or Y coil is arranged on a plurality of double-layer structures that have the same XY position and are arranged adjacently along a direction Z, each X coil or Y coil is wound at least two turns on each double-layer structure, and each turn of coil is arranged on the double-layer structure, so that current flows to and fro at least once between the upper layer and the lower layer of each double-layer structure.