Halbach Rotor Magnet Layout With Short-Circuit Reduction
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Solution Overview
Problem
Existing technologies fail to sufficiently increase the magnetic flux of the magnetic pole facing the stator due to short-circuiting between auxiliary magnets in the rotor core.
Innovation Solution
The implementation of a short-circuit reduction part, such as a non-magnetic body or space with higher magnetic resistance, is provided around the auxiliary magnets to minimize short-circuiting, while arranging auxiliary magnets in a Halbach array to enhance magnetic flux facing the stator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If auxiliary magnets are arranged in a Halbach array to increase magnetic flux, then the magnetic flux of the main magnet can be increased, but magnetic flux short-circuits between the magnetic poles of the auxiliary magnets through the rotor core
Solution Approach 1:
The rotor core is segmented by introducing non-magnetic parts (such as non-magnetic ribs or partitions) that divide the rotor core into separate regions. These partitions prevent the magnetic flux from short-circuiting between adjacent auxiliary magnets while allowing the auxiliary magnets to maintain their Halbach array configuration for enhanced magnetic flux production.
Solution Approach 2:
The rotor core is designed with non-uniform magnetic properties by incorporating non-magnetic parts at specific locations where short-circuiting occurs. This creates localized regions with different magnetic conductivities, blocking the harmful short-circuit paths while preserving the overall magnetic flux enhancement from the Halbach array arrangement.
2Power
If auxiliary magnets are arranged adjacent to first magnets in a Halbach array, then magnetic flux is enhanced, but short-circuiting between magnetic poles reduces the effectiveness
Solution Approach 1:
Non-magnetic partitions are introduced to segment the rotor core structure, creating isolated magnetic circuits for each auxiliary magnet. This segmentation prevents cross-talk and short-circuiting between adjacent magnets, ensuring that each magnet's flux contributes effectively to the overall motor output.
Solution Approach 2:
Non-magnetic parts act as intermediary barriers between the magnetic poles of adjacent auxiliary magnets. These intermediaries block the direct magnetic coupling that would otherwise create short-circuit paths, while allowing the desired magnetic flux from each auxiliary magnet to reach the stator through the air gap.
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 effectively reduces short-circuiting and increases the magnetic flux facing the stator, thereby enhancing the output of the electric motor.
Implementation Method 1
auxiliary magnets arranged in a Halbach array so as to increase the magnetic flux of the magnetic pole facing the stator
Implementation Method 2
auxiliary magnets arranged in a Halbach array
Implementation Method 3
short-circuit reduction part provided at a portion around the auxiliary magnet facing the auxiliary magnet in parallel with a virtual line connecting the two magnetic poles... to reduce a short-circuit of a magnetic flux
Data Source
AI summary
An electric motor includes a stator; a rotor facing the stator a first direction and configured to be rotatable in a second direction that is orthogonal to the first direction; and a short-circuit reduction member, wherein the rotor includes a main magnet having a first magnetic pole on a surface facing the stator; an auxiliary magnet arranged adjacent to the main magnet and having a second magnetic pole and a third magnetic pole that is different in polarity from the second magnetic pole, and configured to increase a magnetic flux of the first magnetic pole, and wherein the auxiliary magnet is arranged adjacent to the main magnet.