Sensorless Motor Control Iron Loss Compensation
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Solution Overview
Problem
Existing sensorless control methods for motors at ultra-high-speed regions are inaccurate due to the lack of consideration for iron loss, leading to potential uncontrollable situations, as they do not account for the increasing iron loss with motor speed.
Innovation Solution
A control model that considers iron loss is added to the back electromotive force (back EMF) observer to estimate a more accurate electrical angle error, which is then used to compensate for the error and stabilize motor control in ultra-high-speed regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a sensorless control method using a control model that does not consider iron loss is used, then the control system is simple and easy to implement, but the electrical angle estimation becomes increasingly inaccurate as motor speed increases in ultra-high-speed regions
Solution Approach 1:
The patent modifies the control model parameters by incorporating iron loss considerations into the back EMF observer. This involves changing the mathematical model parameters to account for iron loss effects, thereby improving electrical angle estimation accuracy in ultra-high-speed regions without requiring additional sensors or complex hardware modifications
Solution Approach 2:
The patent introduces an intermediary compensation mechanism that calculates and compensates for electrical angle errors caused by iron loss. This intermediary calculation layer processes the back EMF observer output and corrects the electrical angle estimation, effectively mediating between the simple control structure and the need for high precision
2Productivity
If iron loss is not considered in the control model, then the control algorithm is simpler and faster to compute, but the motor becomes uncontrollable in ultra-high-speed driving regions due to substantial electrical angle errors
Solution Approach 1:
The patent changes the control model parameters to include iron loss compensation terms in the back EMF observer equations. This parameter modification allows the system to maintain computational efficiency while improving reliability in ultra-high-speed regions by accounting for iron loss effects in the control calculations
Solution Approach 2:
The patent applies preliminary compensation for iron loss effects through the modified back EMF observer before the control action is executed. By pre-calculating and compensating for electrical angle errors due to iron loss, the system ensures reliable controllability is maintained from the outset in ultra-high-speed operating conditions
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 allows for more stable and efficient sensorless control in ultra-high-speed regions by accurately calculating the electrical angle error, enhancing motor stability, efficiency, and drivability, and improving torque and power performance.
Implementation Method 1
a sensorless control method for a motor that may more stably perform sensorless control in an ultra-high-speed driving region of a motor by adding a control model that considers iron loss of the motor to a back electromotive force (back EMF) observer
Data Source
AI summary
A sensorless control method and system for a motor are provided. The includes a back EMF observer that is configured to estimate a back EMF of the motor and an angle error calculator that is configured to calculate an electrical angle error considering iron loss of the motor based on the back EMF estimated by the back EMF observer. An angle error compensator is configured to compensate the electrical angle error calculated by the angle error calculator. An electrical angle for compensating the calculated electrical angle error is obtained through simulation or experiment for the motor. In addition, a PLL controller is configured to receive the compensated electrical angle to estimate an actual angle by reducing the electrical angle error due to the iron loss, and to operate the motor based on the estimated actual angle.