Permanent Magnet Generator Assembly with Counteracting Armature Field
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Solution Overview
Problem
The assembly of permanent magnet generators for wind turbines is hindered by strong magnetic attraction forces between the rotor and stator, which can lead to deformation and damage during the assembly process due to the presence of already magnetized permanent magnets, making the process slow, unsafe, and difficult to manage.
Innovation Solution
Incorporating a power source and control system to selectively feed currents to the armature coils, creating a magnetic field that opposes the magnetic field generated by the permanent magnets, thereby reducing attraction forces and facilitating a safer and faster assembly process by allowing the armature and field to be assembled with reduced magnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If permanent magnets are magnetized and attached to the field before assembling with the armature, then the assembly process becomes faster, but strong magnetic attraction forces cause deformation and damage to the stator and rotor
Solution Approach 1:
The patent applies preliminary anti-action by introducing a counteracting magnetic field through electromagnets before the permanent magnets are fully magnetized or before the armature and field are brought into close proximity. This counteracting field neutralizes the harmful magnetic attraction forces in advance, allowing the components to be assembled safely at higher speeds without deformation or damage.
Solution Approach 2:
The patent uses electromagnets as intermediary elements that can generate controlled magnetic fields to counterbalance the attraction forces from permanent magnets. These electromagnets act as mediators during the assembly process, allowing precise control over magnetic interactions and enabling safe, fast assembly by temporarily managing the magnetic forces between components.
2Loss of time
If permanent magnets are magnetized before assembly, then manufacturing time is reduced, but the assembly process becomes unsafe and difficult to manage due to strong magnetic forces
Solution Approach 1:
The electromagnets are activated in advance to create a counteracting magnetic field that prevents excessive attraction forces from developing during assembly. This preliminary anti-action ensures that even though permanent magnets are pre-magnetized (saving time), the assembly process remains safe and controllable through active magnetic force management.
Solution Approach 2:
The patent dynamically changes magnetic field parameters by controlling the electromagnets' current and polarity. This allows real-time adjustment of the counteracting magnetic field strength to match the assembly stage, ensuring safety throughout the process while maintaining the time efficiency of pre-magnetized permanent magnets.
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 approach enables a faster and safer assembly of permanent magnet generators by reducing magnetic attraction forces, allowing for easier inspection and control during the assembly process, and preventing deformation or damage to the rotor and stator components.
Implementation Method 1
Incorporating a power source and control system to selectively feed currents to the armature coils, creating a magnetic field that opposes the magnetic field generated by the permanent magnets
Implementation Method 2
feed currents to the armature coils, creating a magnetic field that opposes the magnetic field generated by the permanent magnets, thereby reducing attraction forces
Data Source
AI summary
A method for assembling a generator rotor carrying permanent magnets defining a magnetic field and a generator stator defining an armature having a plurality of coils includes moving one or both of the generator rotor and the generator stator towards the other of the generator stator and the generator rotor to generate relative movement between the generator rotor and the generator stator. Simultaneously with the relative movement, the coils of the armature are electrically feed such that circulating currents along the armature create a magnetic field in an opposite direction of the magnetic field created by the permanent magnets to reduce a magnetic attraction between the generator rotor and the generator stator.