Electric Motor Rotor Balancing Disk Layout for Magnetic Isolation
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Solution Overview
Problem
Existing rotor devices for electric motors require expensive paramagnetic materials and high material removal efforts to balance imbalances, with limitations on drilling near magnetic units, leading to increased costs and material inefficiency.
Innovation Solution
A method involving transfer molding to fix magnetic units and balancing disks on a rotor shaft with a defined gap filled with molding compound, allowing material removal from balancing disks without damaging adjacent components, using less expensive materials and reducing weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If balancing disks are made from paramagnetic materials to avoid magnetic short circuits, then magnetic isolation is improved, but material costs and weight increase
Solution Approach 1:
The rotor device is segmented into multiple functional zones: magnetic units in sheet metal packets, balancing disks at ends, and molding compound filling the intermediate gaps. This segmentation allows non-paramagnetic materials to be used in balancing disks while maintaining magnetic isolation through the molding compound barriers between magnetic units and balancing disks.
Solution Approach 2:
Molding compound acts as an intermediary material between the magnetic units and balancing disks. This intermediary provides magnetic isolation without requiring the balancing disks themselves to be made from expensive paramagnetic materials, thereby reducing both cost and weight while maintaining reliability.
2Manufacturing precision
If material is removed from balancing disks to compensate imbalance, then balance precision is improved, but risk of damaging sheet metal packets increases
Solution Approach 1:
The molding compound is applied in advance to create a protective layer between the balancing disks and sheet metal packets before imbalance compensation operations. This preliminary protective action allows subsequent material removal from balancing disks to proceed without risking damage to the sheet metal packets, enabling precise balance compensation.
3Weight of moving object
If balancing disks are made thinner to reduce weight, then weight reduction is achieved, but structural strength and imbalance compensation capability are reduced
Solution Approach 1:
The rotor device employs composite material construction where balancing disks (potentially thinner and lighter) are combined with molding compound to form an integrated structure. The molding compound compensates for the reduced structural capacity of thinner balancing disks while enabling greater material removal for imbalance compensation, achieving weight reduction without sacrificing strength or functionality.
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
Reduces material costs and weight by enabling efficient imbalance compensation with less expensive materials and wider material removal possibilities, while maintaining component integrity.
Implementation Method 1
a gap between the sheet metal packet and the balancing disk, which is filled by a molding compound used for the transfer molding
Data Source
AI summary
A method for producing a rotor device, including providing a rotor shaft having at least one sheet metal packet joined to the rotor shaft. The at least one sheet metal packet includes magnetic units. The method includes performing a transfer molding process, in which the magnetic units are fixed in position in relation to the at least one sheet metal packet and at least one balancing disk is joined axially on the rotor shaft on at least one side of the at least one sheet metal packet such that a gap of a defined width is ensured between the at least one balancing disk and the at least one sheet metal packet. The gap is filled with a molding compound used for the transfer molding process. The method includes determining an imbalance of the rotor device and compensating the imbalance by removing material from the at least one balancing disk.