Removable Rotor Weights for Electric Motor Balancing
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Solution Overview
Problem
Existing electric motor balancing methods, such as using clay-like balancing putty, often result in detachment issues during the balancing process, leading to inefficiencies and premature wear due to vibrations and frictional losses.
Innovation Solution
The integration of removable weights with the rotor shell, which are uniformly spaced and accessible for selective removal, allowing for precise balancing without the need for adhesives, ensuring a unitary construction that can be diecasted or molded for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If clay-like balancing putty is used to balance the rotor, then the rotor can be balanced during manufacture and assembly, but the putty has a tendency to detach from the rotor during balancing or shortly thereafter
Solution Approach 1:
The balancing weight is segmented into a two-part system: a recess in the rotor shell and a separate weight member that fits into the recess. This segmentation allows the weight to be securely retained while maintaining precise balancing capability, resolving the adhesion problem of putty while preserving manufacturing precision.
Solution Approach 2:
The balancing function is extracted from the rotor shell and implemented as a separate, removable weight member. This extraction allows the balancing weight to be independently optimized and securely fitted into a dedicated recess, preventing detachment while maintaining precise rotor balancing.
2Stability of the object's composition
If removable weights are integrally formed with the rotor shell, then a unitary one-piece construction is achieved, but the weights must be accessible for selective removal during balancing
Solution Approach 1:
The unitary construction is segmented at the interface between the rotor shell and weight member, creating a recess that accepts the weight. This segmentation provides a controlled separation point that maintains the appearance of integral construction while enabling easy access for weight removal and installation during balancing operations.
Solution Approach 2:
The recess is pre-formed in the rotor shell during manufacturing, preparing the structure in advance to receive the balancing weight. This preliminary action creates a stable, unitary construction that inherently provides access points for weight removal without requiring additional modifications during balancing operations.
3Manufacturing precision
If weights are uniformly spaced around the rotor shell, then precise balancing can be achieved, but the complexity of the rotor structure increases
Solution Approach 1:
The recess design serves multiple functions: it provides structural integration for a unitary appearance, enables precise weight positioning for balancing, and facilitates easy weight removal. This multi-functionality achieves precise balancing without proportionally increasing structural complexity, as the same recess feature accomplishes multiple objectives.
Solution Approach 2:
The complexity is localized to specific recess positions around the rotor shell where weights are needed, rather than distributing complexity throughout the entire rotor structure. Each recess is a simple, localized feature that provides precise weight mounting while maintaining overall structural simplicity.
Data Source
AI summary
An electric motor includes a stator, a rotor, and weights removably attached to the rotor shell for use in balancing the rotor. The removable weights may be integrally formed with a rotor shell such that the weights and the rotor shell form a unitary, one-piece construction. The removable weights may be substantially uniformly spaced apart around an entirety of the outer perimeter of the rotor shell. In a method of making an electric motor, the stator is coupled to the rotor such that the weights are accessible for selective removal during balancing of the rotor.