Motor Impedance Circuit for Resonance-Induced EMI Suppression
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Solution Overview
Problem
Electric motors generate transient effects like undesired high-amplitude common mode voltages and currents due to electrical resonance, which can interfere with surrounding components and systems, particularly in vehicles like electric vertical takeoff and landing aircraft, making it challenging to control these effects effectively.
Innovation Solution
A circuit system is developed to be coupled with the motor, using a motor circuit model to reduce impedance variations at resonant frequencies, thereby suppressing transient effects by raising common mode impedance and stabilizing the motor's impedance profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circuit system is added to reduce impedance variation at resonant frequencies, then transient effects are suppressed and interference is reduced, but device complexity increases
Solution Approach 1:
The patent changes the impedance parameter of the motor by adding a circuit system that modifies the electrical characteristics at resonant frequencies. The circuit system alters the common mode impedance profile, raising it at resonant frequencies to suppress transient effects and reduce electromagnetic interference with surrounding components.
Solution Approach 2:
The circuit system acts as an intermediary between the motor and the surrounding electrical environment. It mediates the interaction by filtering and controlling the transient effects generated at resonant frequencies, preventing these effects from interfering with other vehicle components while maintaining motor functionality.
2Object-affected harmful factors
If conventional methods are used to suppress transient effects, then interference is reduced, but weight and cost increase
Solution Approach 1:
The motor system serves itself by using its own circuit system to suppress transient effects and reduce electromagnetic interference. The solution is integrated into the motor control architecture, allowing the system to self-regulate its impedance characteristics at resonant frequencies without requiring separate heavy shielding or filtering components.
Solution Approach 2:
Instead of adding physical mass for shielding or filtering, the patent changes the electrical parameters (impedance) of the motor system to inherently suppress transient effects. This parameter-based approach achieves interference reduction without the weight penalty of conventional physical barriers.
3Object-affected harmful factors
If impedance variation is reduced at resonant frequencies, then transient effects are suppressed, but common mode impedance control becomes more challenging
Solution Approach 1:
The circuit system uses feedback control to monitor and adjust the motor's impedance characteristics. By detecting resonant frequencies and measuring impedance variations, the system dynamically adjusts circuit parameters to maintain optimal common mode impedance levels, suppressing transient effects while managing the complexity of impedance control.
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
The solution effectively reduces transient effects at resonant frequencies, minimizing interference and being cost-effective and lightweight, suitable for high-power applications in lightweight vehicles.
Implementation Method 1
The broad spectral content associated with electrical switching of the control system of the electric motor may excite these parasitics. This excitation, in turn, may drive transient effects (e.g., transient voltages, transient currents, etc.) onto structure surrounding the electric motor at electrical resonance.
Data Source
AI summary
Methods and apparatuses for controlling the effects generated by a motor. In one or more examples, a circuit system is configured to be coupled to a motor such that the circuit system reduces a variation in an impedance of the motor within a range of frequencies that includes a resonant frequency of the motor.