Floating Exciter Flux Balancing in Concentrated-Winding Machines
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Solution Overview
Problem
Existing electrical machines face challenges in retrofitting magnetic flux control systems due to the need for extensive mechanical reconstruction, integration with existing voltage regulation systems, and difficulties in adding special windings at high voltages, especially in large machines.
Innovation Solution
A magnetic flux control system for rotating electrical machines with concentrated windings, where all windings are connected in series and supplied by a common main power supply, utilizing a magnetic balancing power supply and controller to individually control currents through segments of the windings based on measured parameters, providing galvanic isolation and independent operation from existing magnetization systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic flux control systems are added to existing electrical machines for retrofitting, then magnetic balancing and vibration reduction are achieved, but mechanical reconstruction and integration complexity increase
Solution Approach 1:
The patent divides the concentrated windings into multiple segments and applies independent current control to each segment through separate power supplies. This segmentation enables localized magnetic field adjustment to compensate for rotor/stator imperfections without requiring complete system redesign, thereby achieving magnetic balancing with manageable complexity
Solution Approach 2:
The patent introduces floating exciters as intermediary components that provide additional magnetic fields independent of the main magnetization system. These floating exciters act as mediators to create compensating magnetic fields that balance rotor/stator imperfections without interfering with the existing voltage regulation system
2Adaptability or versatility
If special windings are added to stators for generating lateral forces, then force control capability is improved, but manufacturing difficulty and cost increase
Solution Approach 1:
The patent makes the concentrated windings serve multiple functions: they provide both the main magnetization current for torque generation and segmented current control for lateral force generation. This multi-functionality eliminates the need for separate special windings, reducing manufacturing complexity while maintaining force control capability
Solution Approach 2:
The patent merges the functions of main magnetization and lateral force generation into a single winding system. By controlling different segments of the same concentrated windings with different currents, the system achieves both torque production and lateral force control without requiring additional winding structures
3Adaptability or versatility
If existing voltage regulation systems are integrated with new magnetic flux control systems, then system compatibility is achieved, but control complexity and integration time increase
Solution Approach 1:
The patent extracts the magnetic balancing function from the main voltage regulation system by using independent floating exciters with separate power supplies. This extraction allows the magnetic flux control to operate independently without requiring complex integration with the existing voltage regulation system, reducing integration time and complexity
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
Enables simple and non-intrusive retrofitting by co-existing with existing systems, effectively compensating for rotor and stator imperfections, reducing vibrations and noise, and improving Total Harmonic Distortion (THD) without harming the original system, while offering continuous online monitoring.
Implementation Method 1
A magnetic flux control system for rotating electrical machines with concentrated windings... utilizing a magnetic balancing power supply and controller to individually control currents through segments of the windings
Implementation Method 2
different forces will thereby be acting between the rotor and the stator... also other forces, e.g. magnetic forces, exist because of non-perfect rotor and/or stator configurations
Data Source
AI summary
A magnetic flux control system (41) for controlling the magnetic flux in an electrical machine (1) with concentrated windings (22A-C) has at least one magnetic balancing power supply (51A-C), at least one balancing-current controller (61A-C) and electrical connections (71) configured to permit the connection of the balancing-current controller(s) over a segment (23) of the concentrated windings. The balancing power supply provides galvanicisolation. The magnetic balancing system has further at least one sensor (75) configured to measure a parameter associated with a magnetic flux, a force, a position, vibrations, voltages, and/or currents. The balancing-current controller(s) (61A-C) is(are) connected to the sensor(s) and is(are) powered by the balancing power supply(supplies). The balancing-current controller is configured to control an output current in dependence of a signal representing the measured parameter of the sensor(s). A winding excitation arrangement, an electrical machine and a method for balancing are also disclosed.