External Rotor Carrier Balancing Using Axial Removal Points
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Solution Overview
Problem
Existing methods for balancing the rotor of external rotor motors are inefficient and costly, as they typically involve removing material from the rotor, which can be mechanically challenging and wasteful.
Innovation Solution
A method is introduced where material is removed from specific points on the carrier of the external rotor motor, arranged at axial distances from each other, to eliminate imbalance. These points can be defined by annular protrusions, allowing for targeted material removal from both designated and non-designated areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If material is removed from the rotor to eliminate imbalance, then balancing is achieved, but the process becomes mechanically challenging and costly
Solution Approach 1:
The carrier is segmented into multiple groups of annular protrusions arranged at different axial positions. Material removal is distributed across these segmented locations rather than concentrated at a single point, enabling flexible imbalance correction without requiring complex mechanical operations on the rotor itself.
Solution Approach 2:
The solution moves from traditional radial material removal to axial dimension by placing protrusions at different axial positions on the carrier. This dimensional shift allows balancing operations to be performed on the carrier structure rather than the rotor, simplifying the mechanical complexity while maintaining balancing effectiveness.
2Reliability
If material is removed from the rotor to eliminate imbalance, then balancing is achieved, but material waste increases
Solution Approach 1:
The carrier is pre-designed with multiple groups of annular protrusions at different axial positions before assembly with the rotor. This preliminary preparation allows selective material removal from specific protrusions based on measured imbalance, minimizing unnecessary material waste compared to traditional rotor material removal methods.
Solution Approach 2:
Different groups of protrusions are provided at different axial positions with potentially different characteristics. Material removal is localized to specific protrusions based on the measured imbalance characteristics, allowing precise material removal only where needed rather than generic rotor material removal.
3Ease of manufacture
If material is removed from single location on carrier, then balancing is attempted, but balancing effectiveness is limited
Solution Approach 1:
The carrier is divided into multiple groups of protrusions at different axial positions. This segmentation provides multiple independent material removal locations, enabling comprehensive imbalance correction that addresses both static and dynamic imbalance components, thereby improving balancing effectiveness while maintaining manufacturing ease.
Solution Approach 2:
By adding the axial dimension with multiple groups of protrusions distributed along the carrier axis, the solution enables three-dimensional material removal capability. This multi-location approach provides greater flexibility in correcting various types of imbalance while keeping each individual manufacturing operation simple.
Data Source
AI summary
A method for balancing a rotor of an external rotor motor is described. The rotor has a back iron ring, permanent magnets attached to the inside of the back iron ring, and a carrier which is attached to the back iron ring and forms a hub for a shaft. Material is removed from the carrier at several points which are arranged at an axial distance from one another in order to eliminate imbalance.