Sensorless Synchronous Reluctance Motor Control Using Reactive Power
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Synchronous reluctance motors require position sensors or encoders for control, increasing manufacturing costs and complicating miniaturization, and existing sensorless methods rely on numerous motor parameters for accurate calculations.
Innovation Solution
A motor control method and device that calculates magnetic flux and reactive power without sensors, using basic motor parameters and compensating for errors to achieve high efficiency and stability, eliminating the need for position sensors and simplifying calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If position sensors or encoders are equipped for motor control, then control accuracy is improved, but manufacturing cost increases and device complexity increases
Solution Approach 1:
The patent extracts and eliminates the position sensor or encoder from the motor control system. By using sensorless control methods that estimate rotor position and speed through mathematical models and electrical measurements, the physical sensing components are removed entirely, reducing device complexity and manufacturing cost while maintaining control accuracy
Solution Approach 2:
The patent replaces the mechanical/electrical sensing system (position sensors or encoders) with a computational/electrical estimation system. Through flux observers and position-speed estimators that process electrical signals and calculate rotor parameters, the system substitutes physical measurement devices with mathematical modeling approaches
2Measurement precision
If position sensors or encoders are equipped for motor control, then control accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent extracts and eliminates the position sensor or encoder from the motor control system. By using sensorless control methods that estimate rotor position and speed through mathematical models and electrical measurements, the physical sensing components are removed entirely, reducing device complexity and manufacturing cost while maintaining control accuracy
Solution Approach 2:
The patent replaces expensive, complex position sensing hardware with inexpensive computational algorithms. The sensorless control approach uses basic electrical measurements and mathematical estimation, eliminating the need for costly sensors and encoders, thereby significantly reducing manufacturing cost
3Measurement precision
If estimators with numerous motor parameters are used for sensorless control, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies partial action by using a simplified set of motor parameters rather than requiring all possible parameters. The flux observer and estimator use only the essential parameters needed for accurate position and speed estimation, avoiding the complexity of incorporating numerous parameters while maintaining measurement precision
Solution Approach 2:
The patent segments the control system into modular functional blocks: flux observer, position-speed estimator, and current controller. Each module handles specific calculations with dedicated parameters, organizing the complexity into manageable segments rather than requiring a monolithic system with all parameters
Data Source
AI summary
A motor control method includes the following steps: receiving a frequency command and an excitation current setting value as a motor speed command; running a magnetic flux calculation program to generate a magnetic flux voltage command; generating a synchronous coordinate voltage command, and providing a three-phase current to a sensorless motor; calculating a synchronous coordinate feedback current based on the three-phase current, and calculating an effective current value of three-phase current; calculating a reactive power feedback value based on synchronous coordinate voltage command and the synchronous coordinate feedback current; running a steady state calculation program to calculate a reactive power command based on frequency command and the effective current value; calculating a reactive power error value between the reactive power command and the reactive power feedback value; and adding magnetic flux voltage command and reactive power error value to adjust synchronous coordinate voltage command and change three-phase current.