Dual-Wound Synchronous Motor Current Control With Coupling Decoupling

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Solution Overview

Problem

Conventional dual wound synchronous machines, such as dual wound permanent magnet synchronous motors, do not effectively consider inductive coupling between the two sets of stator windings, leading to sub-optimal torque control performance due to the lack of control flexibility in current control techniques.

Innovation Solution

A system and method for controlling dual wound synchronous machines that involves determining virtual half-motor current commands and applying mathematical transformations to measured currents to decouple the d-axis and q-axis components of the output currents, allowing independent voltage control of each winding set and accounting for inductive coupling between them.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If conventional current control techniques are used that do not account for inductive coupling, then the control system is simpler, but torque control performance deteriorates

Engineering Contradiction:

Improvecontrol system complexityVSAvoidtorque control performance

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The patent introduces decoupling networks as intermediary components between the dual wound synchronous machine and the control system. These networks contain inductors and resistors that actively compensate for the inductive coupling effects, serving as a mediator that isolates the control system from the coupling disturbances while maintaining simple control architecture.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent modifies the electrical parameters of the system by adding decoupling inductors and resistors with specific impedance values. These parameter changes create artificial decoupling paths that counteract the natural inductive coupling, allowing the control system to treat the two winding sets as independent while maintaining torque control performance.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If inductive coupling between winding sets is considered in control algorithms, then torque control performance improves, but control algorithm complexity increases

Engineering Contradiction:

Improvetorque control performanceVSAvoidcontrol algorithm complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent replaces complex software-based control algorithms with a hardware-based decoupling network. Instead of using sophisticated control algorithms to compensate for inductive coupling, the system uses passive electrical components (inductors and resistors) that automatically provide decoupling, substituting mechanical/electrical means for computational complexity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If independent voltage control of each winding set is implemented, then control flexibility improves, but the impact of inductive coupling on current control worsens

Engineering Contradiction:

Improvecontrol flexibilityVSAvoidcurrent control performance

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The decoupling networks serve as intermediary components that enable independent voltage control of each winding set while simultaneously compensating for inductive coupling effects. The networks contain inductors and resistors that create artificial isolation between the winding sets, allowing flexible independent control without current control degradation.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 approach enhances current and torque control performance by decoupling the d-axis and q-axis components of the output currents, enabling optimal control of dual wound synchronous machines despite inductive coupling, thereby improving operational efficiency and redundancy in safety-critical applications.

Implementation Method 1

inherently have electromagnetic (inductive) coupling between the two sets of stator windings (i.e., coupling between electrical circuits due to induction caused by magnetic fields generated as a result of the currents flowing through each of the two sets of stator windings)

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS12199485B2Current regulators for dual wound synchronous motor drives

Publication Date: 2025.01.14 STEERING SOLUTIONS IP HOLDING CORP

AI summary

A method of controlling a dual wound synchronous machine (DWSM) includes: determining virtual current commands based on a current command associated with each of two winding sets of the DWSM; determining virtual half-motor currents by applying a mathematical transformation on measured output currents; determining half-motor difference currents based on differences between the corresponding virtual current command and the virtual half-motor current; calculating forward path voltage commands based on the corresponding difference currents and using first and second gain factors; determining feedback voltage commands by applying third and fourth gain factors to the virtual half-motor currents; determining virtual final voltage commands based on the corresponding forward path and feedback voltage commands; determining final voltage commands by applying a second mathematical transformation to the virtual final voltage commands; commanding, based on the final voltage commands, inverters to apply corresponding voltages to the two winding sets and thereby generating the output currents.