Harmonic Mitigation in Electromagnetic Devices via Auxiliary Winding
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Solution Overview
Problem
Existing electromagnetic devices powering non-linear loads suffer from harmonic currents that cause voltage distortion, increased losses, and equipment de-rating due to harmonic heating, with existing filters being complex, costly, and lacking selective control over harmonic mitigation.
Innovation Solution
An electromagnetic device with a magnetic core and auxiliary winding, where the auxiliary winding generates a mitigating flux that interacts with the induced flux to create a virtual air-gap, reducing harmonic effects without additional filters, and a parameter management module controls the auxiliary winding parameters to optimize harmonic mitigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If passive harmonic filters are connected to mitigate harmonic currents, then harmonic distortion is reduced, but the filters are susceptible to impedance changes and fail to provide selective control
Solution Approach 1:
The patent employs a dynamic harmonic mitigation approach where the electromagnetic device with magnetic core and auxiliary winding actively adapts to changing harmonic conditions. The device dynamically adjusts its characteristics to provide selective harmonic mitigation, contrasting with static passive filters that cannot adapt to impedance changes or provide selective control.
Solution Approach 2:
The invention changes the fundamental parameters of the electromagnetic device (magnetic core properties, winding configurations, auxiliary winding parameters) to achieve harmonic mitigation. By modifying these parameters, the device can selectively target specific harmonic frequencies while maintaining adaptability to system impedance changes.
2Object-affected harmful factors
If active filters are used for harmonic mitigation, then selective control and harmonic reduction are achieved, but device complexity and cost increase due to high power electronic components
Solution Approach 1:
The patent replaces complex power electronic active filter systems with an electromagnetic-based solution using magnetic cores and windings. This substitution eliminates the need for high-power electronic components while achieving similar harmonic mitigation functionality through electromagnetic principles, thereby reducing device complexity and cost.
Solution Approach 2:
The electromagnetic device with magnetic core and auxiliary winding provides self-regulating harmonic mitigation through its inherent electromagnetic characteristics. The device automatically adapts to system conditions without requiring complex control electronics or power electronic components, achieving harmonic reduction through passive electromagnetic mechanisms.
3Power
If electromagnetic devices power non-linear loads, then power delivery is achieved, but harmonic currents cause increased losses and heating
Solution Approach 1:
The patent converts the harmful effect of harmonic currents into a beneficial mechanism by using the auxiliary winding to generate a mitigating flux that specifically targets and counteracts harmonic components. The harmonic-induced flux in the magnetic core is transformed from a source of losses into a controlled element for harmonic mitigation, reducing copper and iron losses while maintaining power delivery.
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
Effectively mitigates harmonics without increasing costs or design complexity, providing selective control and reducing harmonic heating and losses in electromagnetic devices.
Implementation Method 1
a primary winding positioned so as to induce flux in the magnetic core... an auxiliary winding capable of carrying an auxiliary current therewithin and positioned at least partially within a cavity configured in the magnetic core
Implementation Method 2
the auxiliary winding generates a mitigating flux that interacts with the induced flux to create a virtual air-gap, reducing harmonic effects
Data Source
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AI summary
An electromagnetic device (100) connected to a non-linear load, and having a magnetic core (101), a primary winding (102) wound therein, and an auxiliary winding (103) positioned at least partially within a cavity (101A) of the magnetic core (101), is provided. The primary winding (102) carries a primary current (Ip) therewithin and is positioned with respect to the magnetic core (101) such that a flux (104) is induced in the magnetic core (101) during operation of the electromagnetic device (100). The auxiliary winding (103) carries an auxiliary current (Iaux) therewithin and dynamically induces a mitigating flux (105) in the magnetic core (101), during operation of the electromagnetic device (100) countering harmonics present in the induced flux (104) by modulating reluctance of the magnetic core (101) around the cavity (101A).