In-situ Magnetization of Electric Machine Rotor Modules
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for activating and reactivating electric machines with magnetizable modules are cumbersome and costly, requiring specialized tools and facilities due to the strong forces involved, and often necessitate transporting the rotor to a factory for remagnetization, which is inefficient and time-consuming.
Innovation Solution
A method and apparatus that allows magnetizing the modules after the rotor is fitted to the stator, using a magnetizing device inserted within a frame that fits inside a stator segment seat, enabling magnetization with a precision positioning system to handle the modules safely and efficiently, allowing for on-site activation and reactivation without dismantling the machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetization is performed before assembling the rotor to the stator, then the modules can be properly magnetized, but the strong interacting forces require special tools and facilities, increasing device complexity and handling difficulty
Solution Approach 1:
The magnetization is performed as a preliminary action after the rotor is assembled to the stator, rather than before assembly. The method enables the rotor to be assembled in its non-magnetized state, and then magnetized in situ using a magnetizing device that can be inserted through the stator, eliminating the need for complex special-purpose assembly facilities.
Solution Approach 2:
The magnetizing device is extracted through the stator to reach the rotor modules from the opposite side to the bearing. This approach removes the magnetizing operation from the complex assembly facility context and performs it in a simpler, accessible location after assembly is complete.
2Reliability
If the rotor is transported to a factory for remagnetization, then the modules can be reactivated, but the process requires dismantling and transporting the electric machine, increasing loss of time and productivity
Solution Approach 1:
The electric machine performs its own magnetization function through the magnetizing device that can be inserted into the assembled rotor-stator structure. This self-service capability eliminates the need to transport the machine to an external factory for remagnetization, allowing the magnetization to be performed in situ and significantly improving reactivation efficiency.
Solution Approach 2:
The magnetization function is prepared in advance by designing the stator with a seat that accommodates the magnetizing device, enabling the reactivation to be performed quickly without dismantling or transporting the machine, thus improving productivity.
3Ease of manufacture
If magnetized modules are handled during assembly, then the rotor can be constructed, but the strong forces generated create safety hazards and require specialized handling procedures
Solution Approach 1:
The magnetizing operation is extracted from the assembly process itself and performed separately after assembly is complete. The rotor is assembled in its non-magnetized state where no strong interacting forces are present, and then magnetized in situ, eliminating the safety hazards associated with handling magnetized modules during assembly.
Solution Approach 2:
The assembly is completed as a preliminary action before magnetization. By assembling the rotor-stator structure first in its non-magnetized state, the harmful interacting forces are avoided during the assembly phase, and only appear after assembly is complete when the magnetization is performed safely in situ.
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 eliminates the need for transporting magnetized rotors, reduces the risk of interacting forces during assembly, and allows for efficient on-site reactivation, saving time and costs by enabling magnetization after installation, thus improving the overall efficiency and safety of the process.
Implementation Method 1
each module of magnetizable material is made of material that can be magnetized to produce a magnetic field
Implementation Method 2
a magnetizing device, which magnetizes the modules of magnetizable material with magnetizing flux of a given strength
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method of activating an electric machine having a stator (2), and a rotor (3) which rotates about an axis (A1) with respect to the stator (2); the stator (2) having a plurality of stator segments (7) arranged about the axis (A1); the rotor (3) having modules (15) made of magnetizable material and arranged about the axis (A1); and the method including the steps of connecting the rotor (3) to the stator (2) by means of a bearing (16); and magnetizing the modules (15) of magnetizable material when the rotor (3) is connected to the stator (2).