Variable Torque Angle Control for Synchronous Reluctance Motors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electric motor control methods, particularly for synchronous reluctance motors, face challenges in efficiently managing torque angle, leading to suboptimal mechanical torque and power consumption, especially when dealing with varying loads and conditions.
Innovation Solution
A method that varies the torque angle in the d-q-reference frame based on working conditions such as inductance, applied current, and saturation effects, using a product of multiple conditions to determine an optimized angle, and employing a dampening function to stabilize the system, with a fallback value for emergency operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a constant torque angle of 45° is used for maximum torque per ampere control, then stator resistance losses are reduced, but mechanical torque and power consumption are suboptimal under varying working conditions
Solution Approach 1:
The patent applies dynamics by transitioning from a static constant torque angle (45°) to a dynamic variable torque angle that adapts to changing working conditions. The controller continuously adjusts the torque angle based on real-time measurements of phase currents and inductances, allowing the motor to optimize performance across different operating points while maintaining reduced stator losses.
Solution Approach 2:
The invention implements parameter changes by modifying the torque angle parameter from a fixed value to a variable parameter. The controller calculates optimal torque angles by considering working conditions including phase currents, inductances, and saturation effects, thereby changing the operational parameters to match actual motor state and improve overall efficiency.
2Power
If the torque angle is varied based on multiple working conditions including saturation effects, then mechanical torque is increased, but control complexity increases
Solution Approach 1:
The patent employs feedback mechanisms by continuously measuring phase currents and calculating inductances, then using this information to adjust the torque angle. The controller monitors working conditions including saturation effects and feeds this information back to the control algorithm, which computes optimal torque angles and applies them in real-time, creating a closed-loop control system that enhances mechanical torque.
Solution Approach 2:
The invention replaces complex mechanical torque optimization with an electronic control system. Instead of mechanically adjusting motor parameters, the controller uses computational methods to calculate optimal torque angles based on electrical measurements, substituting mechanical complexity with electronic intelligence and software algorithms.
3Use of energy by moving object
If a variable torque angle control method is implemented, then power consumption is reduced, but measurement and calculation precision requirements increase
Solution Approach 1:
The patent applies preliminary action by pre-calculating inductance values and establishing the framework for torque angle optimization before actual motor operation. The controller is pre-programmed with the control algorithm and can immediately begin optimizing power consumption once operational parameters are available, reducing the need for complex real-time computations during critical operating phases.
Data Source
AI summary
A method for controlling an electric motor (such as a synchronous reluctance electric motor) is suggested, in which the torque angle in the d-q-reference frame is at least in part and/or at least at times varied depending on at least one working condition of the electric motor.