Linear Motor Alternating Magnetic Poles Smooth Reciprocation
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Solution Overview
Problem
Conventional linear motors face difficulties in smooth operation due to the need for large forces to attract a magnet over long distances, leading to inefficient movement.
Innovation Solution
A linear motor design featuring a mover with alternating first and second magnetic poles, surrounded by a stator unit that can be energized to drive reciprocal movement, allowing for easier attraction and repulsion of magnetic poles, thereby reducing the distance required for operation and enhancing smoothness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the distance between left and right positions is increased, then the stroke length is improved, but the force required to attract the magnet increases making smooth operation difficult
Solution Approach 1:
The single magnet is divided into multiple magnetic poles (first and second magnetic poles) arranged alternately in the circumferential direction. This segmentation allows the stator to interact with multiple poles simultaneously, distributing the attraction force across different regions and reducing the peak force required to move the mover over long distances.
Solution Approach 2:
The magnetic poles are arranged in the circumferential direction (perpendicular to the axis of motion), creating a multi-dimensional magnetic field interaction. This allows the stator to generate attractive forces on multiple poles at once, effectively reducing the force requirement along the axial direction while maintaining long stroke length.
2Device complexity
If a single magnet is used, then the structure is simple, but the motor cannot operate smoothly due to large force requirements
Solution Approach 1:
The magnet is segmented into multiple magnetic poles with alternating polarities arranged circumferentially. This segmentation transforms the magnetic interaction from a single-point attraction to a distributed multi-point interaction, enabling smoother operation while maintaining relatively simple construction.
Solution Approach 2:
The alternating arrangement of magnetic poles ensures continuous magnetic interaction with the stator throughout the rotation cycle. As the mover rotates, multiple poles are always within the magnetic field of the stator, providing continuous and smooth electromagnetic force generation without abrupt starts or stops.
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 enables smoother and more efficient reciprocal movement of the mover by allowing easier attraction and repulsion of magnetic poles, reducing the distance needed for operation and potentially reducing the overall dimension of the motor.
Implementation Method 1
The stator unit is able to be energized to drive reciprocal movement of the mover relative to the housing... Each of the first magnetic poles has an overlapping portion and an extending portion. Each of the second magnetic poles has an overlapping portion and an extending portion. The overlapping portions of the first magnetic poles and the overlapping portions of the second magnetic poles are arranged alternately in a circumferential direction
Data Source
AI summary
A linear motor includes a housing, a mover and a stator unit. The mover is movable relative to the housing, and includes a rod member, a plurality of first magnetic poles mounted to the rod member, and a plurality of second magnetic poles mounted to the rod member. The first and second magnetic poles are arranged alternately in a circumferential direction of the rod member, and are partially overlapped circumferentially. The stator unit is disposed in the housing, surrounds the mover, and is able to be energized to drive reciprocal movement of the mover relative to the housing.