Adjustable Magnetic Coupling With Coil Excitation and Sealed Torque Transfer
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Solution Overview
Problem
Traditional magnetic couplings face issues with unadjustable torque, difficult installation, easy damage, poor universality, and limited application due to strong magnetic attraction, leading to increased installation complexity and resource wastage, as well as poor cushioning and damping effects.
Innovation Solution
A magnetic coupling design featuring magnet exciting coils for the external magnets and permanent internal magnets, allowing for adjustable torque through current control, simplified and reliable installation, and the omission of a shielding case to enhance magnetic field strength and transfer torque, enabling wider application and better sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If permanent magnets with strong magnetism are used in magnetic coupling, then transfer torque is increased, but installation difficulty increases and magnets are easy to damage
Solution Approach 1:
The patent applies preliminary action by pre-assembling the magnetic coupling components (inner rotor, outer rotor, and permanent magnets) into a complete magnetic coupling unit before installation. This allows the magnets to be pre-positioned and secured in their correct orientations, eliminating the risk of strong magnetic attraction causing installation difficulties during the final installation process. The pre-assembled unit is then installed as a complete package, ensuring both strong magnetic force for high torque transmission and ease of installation.
2Force
If permanent magnets with strong magnetism are used in magnetic coupling, then transfer torque is increased, but the magnets are easy to damage
Solution Approach 1:
The patent applies preliminary action by pre-assembling the magnetic coupling components (inner rotor, outer rotor, and permanent magnets) into a complete magnetic coupling unit before installation. This allows the magnets to be pre-positioned and secured in their correct orientations, eliminating the risk of strong magnetic attraction causing installation difficulties during the final installation process. The pre-assembled unit is then installed as a complete package, ensuring both strong magnetic force for high torque transmission and ease of installation.
3Reliability
If a shielding case is added to magnetic coupling, then sealing is improved, but transfer torque decreases due to increased air gap
Solution Approach 1:
The patent applies the taking out principle by removing the shielding case from the magnetic coupling structure. Instead of using a shielding case that creates an air gap and reduces magnetic coupling efficiency, the patent achieves sealing through alternative means (such as magnetic seals or contactless sealing mechanisms). This extraction of the shielding case eliminates the air gap that would otherwise weaken the magnetic field, thereby maintaining high transfer torque while still providing reliable sealing between the inner and outer rotors.
4Adaptability or versatility
If magnet exciting coils are used instead of permanent magnets, then torque becomes adjustable, but device complexity increases
Solution Approach 1:
The patent applies the universality principle by designing a magnetic coupling that can function with both permanent magnets and magnet exciting coils. The structure is designed to accommodate either configuration, allowing the same basic design to serve multiple functions: high-speed applications with permanent magnets for simplicity, and applications requiring variable torque with magnet exciting coils for adjustability. This multi-functionality reduces overall system complexity by using a universal platform rather than designing separate systems for each application type.
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 solution provides variable torque, improved installation ease, enhanced universality, and better cushioning and damping effects, while increasing transfer torque and expanding the magnetic coupling's application range by minimizing the working air gap and ensuring overall sealing.
Implementation Method 1
at least the external magnets are magnet exciting coils that generate a working magnetic field through power supply
Implementation Method 2
The magnetic lines of force pass through shielding case to transfer the power and motion of the external magnets to the internal magnets
Implementation Method 3
the internal magnets are still at the stationary state at the beginning due to the action of a frictional force and resistance of a transmitted part
Data Source
AI summary
A magnetic coupling, includes a driving rotor sleeved on the driving shaft, a driven rotor sleeved on the driven shaft, external magnets mounted on the driving rotor and internal magnets mounted on the driven rotor and located on the inner sides of the external magnets; a plurality of internal magnets are arranged and uniformly distributed along the circumferential direction of the driven rotor; the external magnets and the internal magnets are aligned one by one along a radial direction; the internal magnets and the external magnets are magnetized along the radial direction; adjacent internal magnets have opposite magnetizing directions, and adjacent external magnets have opposite magnetizing directions; magnetic poles of the internal magnets are opposite to magnetic poles of the corresponding external magnets, and the driving rotor and the driven rotor form a working magnetic circuit through a magnetic field generated by the external magnets and a magnetic field generated by the internal magnets, wherein at least the external magnets are magnet exciting coils that generate a working magnetic field through power supply.