Adaptive PMSM Current Control for Precise Tracking Under Disturbance
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Solution Overview
Problem
Conventional field-oriented control (FOC) techniques for permanent-magnet synchronous motors (PMSMs) face challenges in precise current tracking due to imprecise system parameter determination, leading to instability and decreased performance over time, especially with disturbances like vibrations and temperature changes.
Innovation Solution
Implementing an adaptive compensation method using estimators to accurately estimate system parameters such as q-axis inductance, phase resistance, and rotor flux, which are then used to generate a compensation signal to alleviate the burden on PI controllers and improve current tracking performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional FOC techniques are used for PMSM control, then the control system is simple to implement, but current tracking precision deteriorates due to imprecise system parameter determination
Solution Approach 1:
The patent applies preliminary action by estimating system parameters (inductance, resistance, flux) before they are needed for control calculations. The estimator continuously predicts parameter values in advance, allowing the FOC algorithm to use accurate parameter data without waiting for actual measurements, thereby improving current tracking precision while maintaining control system simplicity
Solution Approach 2:
The patent implements feedback through an adaptive estimation mechanism that continuously monitors motor operation and adjusts parameter estimates based on observed deviations. The estimator provides real-time feedback on parameter accuracy, enabling the control system to compensate for parameter drift and maintain precise current tracking without increasing overall system complexity
2Reliability
If conventional FOC control is used, then the control algorithm is computationally simple, but system stability deteriorates under disturbances like vibrations and temperature changes
Solution Approach 1:
The patent applies dynamics by transitioning from static parameter assumptions to dynamic parameter estimation. The estimator continuously adapts parameter values based on changing operating conditions, allowing the control algorithm to maintain stability under disturbances such as vibrations and temperature changes without requiring a completely complex control architecture
Solution Approach 2:
The patent implements self-service through an autonomous estimation mechanism that automatically adjusts system parameters without external intervention. The estimator monitors system behavior and self-corrects parameter deviations, enabling the control algorithm to maintain stability under varying conditions while keeping the overall control structure relatively simple
3Measurement precision
If precise system parameters are used in FOC, then current tracking accuracy is improved, but computational burden increases
Solution Approach 1:
The patent applies parameter changes by transforming the computational approach from direct calculation of complex parameter relationships to iterative estimation of individual parameters. The estimator breaks down the computational burden by estimating inductance, resistance, and flux separately through simplified calculations, maintaining current tracking accuracy while reducing overall computational requirements
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 adaptive compensation method enhances current tracking accuracy and stability by providing precise motor parameter information, reducing computational burden and improving control system performance, even under varying conditions.
Implementation Method 1
A stator of a PMSM typically carries windings connected to an AC supply to produce a stator field (i.e., a rotating magnetic field) that rotates in time with oscillations of currents at the stator windings
Implementation Method 2
Permanent-magnet synchronous motors (PMSMs) are synchronous motors that use permanent magnets embedded in the rotor to create the second, constant, magnetic field. At synchronous speeds, a rotor of a PMSM poles' lock to the rotation of the stator field
Data Source
AI summary
Described embodiments relate to motor control for synchronous motors, and more specifically, some embodiments relate to motor-current control for permanent-magnet synchronous motors. Embodiments of a current controller are described that include an adaptive controller configured to adapt to changing system dynamics of a PMSM. Embodiments of adaptive control techniques are described that involve estimating system parameters of a PMSM and adapting control actions to compensate for such estimated system parameters. Such adapted control actions may be expected to track an observed motor current to a desired motor current. Systems, methods and devices related to the above are also described.