Motor Temperature Compensation via Single Magnetic Flux Table
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Solution Overview
Problem
Permanent magnet type electric motors experience reduced driving force and deteriorated fuel economy due to temperature changes in their operating environment, affecting their accelerating ability and efficiency.
Innovation Solution
A system that includes a temperature sensor, command compensation unit, D-axis and Q-axis current command tables, current controller, and inverter to compensate for temperature changes in real-time, using a single magnetic flux table to adjust torque and magnetic flux commands, thereby maintaining motor efficiency and torque accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple magnetic flux tables are used to compensate for temperature changes, then torque accuracy is improved, but device complexity and computation time increase
Solution Approach 1:
The patent merges multiple temperature-specific magnetic flux tables into a single unified table by pre-calculating and storing magnetic flux values across a full temperature range. This allows the system to maintain high torque accuracy through temperature compensation while reducing device complexity by eliminating the need for multiple separate tables.
Solution Approach 2:
The patent changes the parameter approach from selecting discrete tables based on temperature to using a continuous parameter space where the magnetic flux table contains data for all temperatures. The system adjusts the selected flux value based on actual temperature, transforming a discrete selection problem into a continuous parameter adjustment.
2Measurement precision
If multiple magnetic flux tables are used for different temperatures, then torque accuracy is improved, but development time increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating magnetic flux values for the entire temperature range during the development phase and storing them in a single comprehensive table. This eliminates the need for separate development and testing of multiple individual tables, significantly reducing development time while maintaining torque accuracy.
3Use of energy by moving object
If temperature compensation is implemented in real-time control, then motor efficiency is improved, but computation complexity increases
Solution Approach 1:
The patent performs the complex computation work in advance by pre-calculating magnetic flux values for all temperature conditions and storing them in lookup tables. During real-time operation, the system only needs to perform simple table lookups and basic arithmetic operations, reducing real-time computation complexity while maintaining the ability to improve motor efficiency through temperature compensation.
Data Source
AI summary
An apparatus for minimizing an influence of a temperature change may include a motor, a temperature sensor for sensing a temperature of the motor to create the temperature information, a command compensation unit compensating a torque command or a magnetic flux demand according to the information on the sensed temperature to create a compensation torque command value or a compensation magnetic flux command value, and an inverter for driving the motor according to a D-axis voltage command value and a Q-axis voltage command value are created according to a D-axis current command value and a Q-axis current command value which are matched with the compensation torque command value or the compensation magnetic flux command value.