Dual Coil Linear Motor for Gantry Parallelism
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Solution Overview
Problem
Existing linear motor systems for gantry systems face challenges in maintaining parallelism and control due to asynchrony between motors with different control gains, leading to control mismatch and noise, especially when handling varying payloads and requiring both linear and rotational motion.
Innovation Solution
A dual coil motor system with a first coil section having a high motor force constant for linear motion and a second coil section with a lower motor force constant for rotational motion, both integrated into a compact structure within the same coil bracket, allowing independent operation from separate power amplifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single linear motor is used to drive both linear and rotational motion, then device complexity is reduced, but control precision deteriorates due to gain variations and control mismatch
Solution Approach 1:
The motor is segmented into two independent coil sections (first coil section and second coil section) within the same motor structure. Each coil section has a different motor force constant and can be independently controlled by separate power amplifiers, allowing independent optimization for linear motion and rotational motion control
Solution Approach 2:
Different parts of the motor (coil sections) are designed with different local properties - the first coil section has a higher motor force constant optimized for linear motion, while the second coil section has a lower motor force constant optimized for rotational motion, allowing each section to be locally optimized for its specific function
2Adaptability or versatility
If linear motors with different control gains are used to handle varying payloads, then adaptability is improved, but control stability deteriorates due to asynchrony between motors
Solution Approach 1:
The motor provides adjustable control by varying the current supplied to different coil sections, allowing the motor force constant to be dynamically changed to match different payload requirements and control modes (linear vs rotational), thereby maintaining stability across varying operating conditions
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 configuration enhances motion performance by reducing noise and vibration, enabling effective control of both linear and rotational axes with improved parallelism and reduced stress on the system.
Implementation Method 1
a plurality of coils and permanent magnets are arranged for driving the object... the coil sets cooperate with a plurality of permanent magnets to produce forces in a linear direction through electromagnetic interaction when current is supplied through the coils
Data Source
AI summary
A linear motor is provided that includes a magnetic assembly, a movable element and a coil assembly that is operative to interact with the magnetic assembly to drive the movable element along a direction. The coil assembly further includes a first coil section having a first motor force constant and a second coil section having a second motor force constant that is lower than that of the first coil section for driving the movable element along the said direction.