Magnetic Levitation Motor Control for Stable Contact-Free Rotation
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Solution Overview
Problem
Existing motors and rotary apparatuses face challenges in achieving stable rotation without contact and are often complex due to the need for multiple stators to control rotor attitude, leading to instability and increased size.
Innovation Solution
A motor design featuring a mover with permanent magnets and coils arranged around a rotation axis, controlled by a control unit that manages currents to the coils, allowing for six-axis control of rotational speed and attitude, enabling stable rotation without contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple stators are used to control rotor attitude, then rotation control is achieved, but device complexity increases
Solution Approach 1:
The patent combines the rotation control function and attitude control function into a single stator by arranging multiple coils (first through fourth coils) around the rotor. This single stator integrates the capabilities of what would traditionally require separate upper and lower stators, thereby reducing device complexity while maintaining rotation stability through unified control of all coil currents.
2Device complexity
If a single stator with dual-purpose winding is used, then device complexity is reduced, but rotation stability deteriorates due to uncontrolled inclination
Solution Approach 1:
The patent segments the control function by providing independent current control for each of the four coils (first, second, third, and fourth coils) arranged around the rotor. This segmentation allows the control unit to independently adjust currents in each coil to precisely control both rotation speed and attitude, including inclination control, thereby maintaining rotation stability while using a single stator structure.
Solution Approach 2:
The patent implements dynamic control by allowing the control unit to continuously adjust the currents applied to each coil based on real-time rotation conditions. This dynamic current adjustment enables active control of rotor attitude and inclination during operation, ensuring rotation stability is maintained throughout the operational range rather than being fixed at a single operating point.
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 motor achieves stable, contact-free rotation with a simpler structure by precisely controlling the mover's attitude and speed using a control unit, reducing complexity and potential instability.
Implementation Method 1
a first portion that includes a plurality of permanent magnets; and a second portion that includes a plurality of coils... controlling currents that are applied to the plurality of coils
Data Source
AI summary
A motor includes: a first portion that includes a plurality of permanent magnets; and a second portion that includes a plurality of coils, wherein the first portion or the second portion is configured to be rotatable around a rotation axis, wherein the plurality of permanent magnets are circumferentially arranged about the rotation axis, and wherein the plurality of coils are arranged so as to face the plurality of permanent magnets in a direction along the rotation axis, and the motor further includes: a control unit that controls a rotational speed and an attitude of the rotating first portion or the rotating second portion by controlling currents that are applied to the plurality of coils.