Universal Adaptive Torque Control for Permanent Magnet Motors
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Solution Overview
Problem
Existing motor control systems require significant optimization for specific permanent magnet motors, making them costly and inefficient for universal application across different types of permanent magnet motors, particularly internal and surface mount motors.
Innovation Solution
A motor control system that uses a single motor control unit with stored torque-current relationships normalized with respect to demagnetization current, allowing universal adaptive torque control by normalizing motor parameters and constructing lookup tables for both internal and surface PM motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motor control systems are optimized for specific permanent magnet motors, then control performance is improved, but device complexity and cost increase
Solution Approach 1:
The patent creates a universal motor control system that can control both interior permanent magnet motors and surface permanent magnet motors using the same control unit. This is achieved by normalizing motor parameters (flux linkage, inductance, resistance) with respect to demagnetization current, allowing the control system to adapt to different motor types without reconfiguration, thus reducing device complexity while maintaining control performance
Solution Approach 2:
The patent transforms motor-specific parameters into normalized parameters by dividing flux linkage, inductance, and resistance by the demagnetization current. This parameter transformation allows the control system to use universal lookup tables and control algorithms that work across different motor types, eliminating the need for motor-specific optimization while preserving control effectiveness
2Measurement precision
If motor control units are customized for different permanent magnet motor types, then control precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent enables a single control unit design to serve multiple motor types (interior PM and surface PM motors) through parameter normalization. By expressing all motor parameters relative to demagnetization current, the control unit requires only one set of lookup tables and control algorithms, significantly reducing manufacturing costs while maintaining torque control precision across different motor types
Solution Approach 2:
The patent creates normalized lookup tables that represent universal torque-current relationships applicable to all permanent magnet motors. These normalized tables serve as templates that can be applied to any motor type without requiring separate customized tables, reducing development and manufacturing costs while preserving control precision
3Reliability
If separate control systems are developed for interior and surface permanent magnet motors, then motor-specific performance is optimized, but adaptability decreases
Solution Approach 1:
The patent transforms motor-specific parameters into dimensionless normalized parameters by dividing by demagnetization current. This parameter change reveals universal relationships between torque and current that are independent of motor type, allowing a single control system to adapt to both interior and surface permanent magnet motors while maintaining optimal performance for each type
Data Source
AI summary
A system and method for controlling any of a variety of permanent magnet motors includes normalizing motor parameters with respect to demagnetization current of a motor and developing a torque-per-current relationship using the normalized motor parameters at approximately maximum torque. Using the developed torque-per-current relationship, it is possible to control any of a variety of permanent magnet motors without the need for extensive configuration of a motor control unit for a specific motor.