Transient Current Planning for Ultra-High-Speed PMSM Speed Regulation
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Solution Overview
Problem
Ultra-high-speed permanent magnet synchronous motors have unsatisfactory speed regulation response capabilities due to current trajectories derived from steady-state voltage models, which do not maximize electromagnetic torque output during speed regulation.
Innovation Solution
A transient current planning method that includes a MTPA control subsystem, general flux-weakening control subsystem, MTPV control subsystem, and mode switching condition judgment subsystem, calculating d- and q-axis current instruction values to optimize torque output and control mode switching based on voltage and angular velocity conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If current trajectories are derived based on steady-state voltage models, then the control system is simple, but the speed regulation response capabilities are unsatisfactory
Solution Approach 1:
The patent transitions from steady-state current planning to dynamic transient current planning by incorporating transient voltage drops and time-varying parameters. The control system dynamically adjusts current trajectories based on real-time operating conditions, including transient states during speed regulation, thereby improving response capabilities while maintaining manageable complexity through systematic modeling approaches.
2Device complexity
If steady-state voltage models are used for current planning, then the model is simple, but the maximum electromagnetic torque output cannot be achieved during speed regulation
Solution Approach 1:
The patent changes the modeling parameters from steady-state assumptions to transient-state parameters, incorporating time-varying voltage drops, inductance effects, and dynamic back-EMF characteristics. This allows the system to calculate optimal current trajectories that maximize electromagnetic torque during transient speed regulation processes while maintaining model tractability through structured mathematical formulations.
3Reliability
If active disturbance rejection control is used, then the disturbance rejection capabilities are improved, but the maximum torque output capability is not increased
Solution Approach 1:
The patent applies preliminary action by pre-calculating optimal current trajectories that account for transient effects and voltage constraints before executing speed regulation. This proactive approach ensures the system operates at maximum torque capability throughout the transient process, rather than merely reacting to disturbances after they occur, thereby simultaneously achieving high torque output and disturbance rejection.
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
Enhances speed regulation response capabilities and achieves maximum electromagnetic torque output at any rotational speed by considering transient current changes and switching between control modes, improving dynamic characteristics and torque precision.
Implementation Method 1
the MTPA control subsystem calculates d- and q-axis current instruction values under MTPA control, the general flux-weakening control subsystem calculates d- and q-axis current instruction values in a general flux-weakening control stage
Implementation Method 2
ultra-high-speed permanent magnet synchronous motor
Data Source
AI summary
A transient current planning method for an ultra-high-speed permanent magnet synchronous motor for improving speed regulation response capabilities is provided. A transient current planning module uses a voltage model considering transient current changes to calculate current instruction values of an ultra-high-speed permanent magnet synchronous motor under MTPA control, general flux-weakening control, and MTPV control; a mode switching condition judgment subsystem judges whether a control mode is MTPA control or general flux-weakening control, or MTPV control, and sends d- and q-axis current instruction values in the corresponding control mode to a voltage decoupling control module; and the voltage decoupling control module calculates d- and q-axis voltage instruction values for controlling the motor, so as to realize control over the ultra-high-speed permanent magnet synchronous motor.