Dual-Wound Synchronous Motor Current Control with Virtual Half-Motors
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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 involve 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
Engineering Contradiction Analysis
1Device complexity
If conventional current control techniques are used that do not consider inductive coupling, then the control system is simpler, but torque control performance is sub-optimal
Solution Approach 1:
The patent segments the dual-wound motor control into two independent virtual half-motors through mathematical transformation. By transforming the coupled current control problem into two decoupled virtual motor control problems, the system can apply conventional control techniques to each virtual motor independently while achieving optimal torque control performance that accounts for inductive coupling effects
Solution Approach 2:
The patent introduces virtual half-motors as an intermediary mathematical model between the physical dual-wound motor and the control system. This virtual model transforms the complex coupled system into two simpler decoupled systems that can be controlled independently, thereby improving torque control performance without significantly increasing control complexity
2Productivity
If inductive coupling between winding sets is considered in control, then torque control performance is optimized, but control algorithm complexity increases
Solution Approach 1:
The control algorithm segments the coupled current control into two independent virtual half-motor control problems. This segmentation allows the complex inductive coupling to be handled through mathematical transformation, resulting in two simpler decoupled control algorithms that can be implemented independently for each virtual motor
Solution Approach 2:
The patent changes the control parameters from physical winding currents to virtual half-motor currents through mathematical transformation. This parameter change transforms the coupled control problem into decoupled virtual motor control, optimizing torque control performance while managing algorithm complexity through coordinate transformation
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.
Implementation Method 1
command, based on the first final voltage command, a first inverter to apply a first output voltage to the first winding set and thereby causing a first output current to be generated in the first winding set
Implementation Method 2
command, based on the second final voltage command, a second inverter to apply a second output voltage to the second winding set and thereby causing a second output current to be generated in the second winding set
Implementation Method 3
dual wound synchronous machines, including dual wound permanent magnet synchronous machines (DW-PMSMs), inherently have electromagnetic (inductive) coupling between the two sets of stator windings
Data Source
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.