Variable Current Controller Gain for IPM Motor Temperature Adaptation
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Solution Overview
Problem
Existing motor control methods for IPM motors, which rely on constant current controller gains, fail to account for changes in inductance and resistance due to temperature increases, leading to intensified current ripple and motor vibration, particularly in eco vehicles.
Innovation Solution
A method that adjusts the d-axis and q-axis current controller gains and motor resistance based on temperature functions, using variable control maps to match inductance and resistance values with temperature changes, thereby generating appropriate voltage commands to reduce current ripple and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant current controller gains are used for IPM motor control, then the control is simple and stable at room temperature, but current ripple and motor vibration are intensified when motor temperature increases
Solution Approach 1:
The patent applies the dynamics principle by transitioning from constant current controller gains to variable gains that dynamically adjust according to motor temperature. The control system continuously monitors temperature and modifies the d-axis and q-axis current controller gains accordingly, enabling the system to adapt to changing thermal conditions and maintain optimal performance across different operating temperatures.
Solution Approach 2:
The patent implements parameter changes by modifying the current controller gains (Kp and Ki parameters) based on temperature variations. Specifically, the d-axis and q-axis Kp gains and Ki gain are adjusted as functions of motor temperature, allowing the control parameters to change dynamically with thermal conditions, thereby reducing current ripple and vibration at elevated temperatures.
2Object-affected harmful factors
If variable current controller gains based on temperature functions are used, then current ripple and motor vibration are reduced, but the control system complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-establishing temperature-gain mapping relationships and control algorithms before actual motor operation. The variable gain strategy is designed and configured in advance, allowing the control system to directly lookup or calculate appropriate gains based on measured temperature without requiring complex real-time optimization, thus reducing computational burden while maintaining effectiveness.
3Ease of manufacture
If inductance and resistance values are kept constant for current controller gains, then the controller is simple to implement, but gain suitability deteriorates as motor temperature increases
Solution Approach 1:
The patent implements parameter changes by transitioning from constant inductance and resistance values to temperature-dependent variable values. The d-axis and q-axis inductance parameters and resistance parameter are updated based on motor temperature measurements, ensuring that the current controller gains remain suitable across the full operating temperature range while maintaining a relatively simple implementation through predefined temperature-gain relationships.
Data Source
AI summary
A method for controlling a motor based on a variable current controller gain may include a temperature function current applying mode in which when a torque command for the motor is detected by an inverter, 3-phase current to be applied to the motor is output to the motor in consideration of a motor temperature of the motor as a function.