Rotating Electrical Machine Equalizer Slot Positioning
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Solution Overview
Problem
Existing rotating electrical machines do not fully utilize the noise-reducing and vibration-reducing effects of equalizers due to non-optimal positioning of slots through which equalizers connect commutator segments in contact with brushes, leading to reduced effectiveness in minimizing radial exciting forces.
Innovation Solution
The rotating electrical machine design includes magnetic poles with slots at their centers, where equalizers are passed through to connect commutator segments in contact with brushes, ensuring uniform resistance and minimizing electromagnetic forces, thereby enhancing the noise and vibration reduction effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If equalizers are passed through slots at non-center positions of magnetic poles, then the structure is simpler to manufacture, but the electromagnetic forces acting on equalizers increase, reducing the noise and vibration reduction effect
Solution Approach 1:
The patent applies local quality by positioning equalizers specifically at the center positions of magnetic poles where the magnetic flux density is minimal. This localized positioning strategy ensures that equalizers experience reduced electromagnetic forces only at critical locations, thereby maximizing noise and vibration reduction effectiveness without requiring structural modifications throughout the entire machine.
2Object-affected harmful factors
If equalizers are passed through slots at center positions of magnetic poles, then the noise and vibration reduction effect is maximized, but the manufacturing precision requirement increases
Solution Approach 1:
The patent employs preliminary action by pre-defining the center positions of magnetic poles as the designated slots for equalizer passage. During the manufacturing process, slots are positioned at these predetermined center locations before assembly, ensuring that equalizers are automatically placed at optimal positions with minimal electromagnetic force exposure. This preliminary positioning eliminates the need for high-precision adjustments during final assembly.
3Ease of manufacture
If equalizer resistance is non-uniform, then the manufacturing process is simpler, but the noise and vibration reduction effect is diminished
Solution Approach 1:
The patent applies homogeneity by requiring all equalizers to have uniform resistance values. This is achieved by using equalizers made from the same material with identical cross-sectional areas and lengths, ensuring consistent electrical properties. The uniform resistance distribution across all equalizers prevents imbalanced current flow and maintains optimal noise and vibration reduction performance.
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 configuration allows for maximum exertion of the equalizers' noise and vibration reduction effects by reducing electromagnetic forces and ensuring uniform resistance, preventing interference with armature windings.
Implementation Method 1
an equalizer connected between respective commutator segments that should have the same potential, and a current most readily flows through an equalizer connecting commutator segments in contact with brushes. Depending on positions of slots through which to wind equalizers connecting the commutator segments in contact with the brushes, an effect of equalizers, that is, an effect of reducing vibrations and noises (radial exciting force), is lowered when the equalizers are subjected to electromagnetic force.
Data Source
AI summary
A rotating electrical machine having a shaft, an iron core having slots, an armature winding inserted into the slots, a commutator provided to the shaft and having a plurality of commutator segments that should have same potential. An equalizer connected at one end to a commutator segment among the commutator segments where the commutator segment is in contact with a brush reaches a rear side of the iron core by passing through a slot positioned at a center of a magnetic pole of the rotating electrical machine and returns to the front side by passing through another slot positioned at a center of another magnetic pole so that the equalizer is connected at the other end to a commutator segment where the commutator segment is in contact with a brush of a same polarity as the firstly-mentioned brush.