Synchronous Motor Drive Phase Resistance Imbalance Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Synchronous motor drives are susceptible to parameter imbalances, leading to undesirable current and torque pulsations, which can result in sub-optimal control and compliance issues with manufacturing requirements, especially in high-performance applications sensitive to noise, vibration, and harshness.
Innovation Solution
A system and method for detecting resistance imbalances in synchronous motor drives using a processor and memory to identify resistance imbalance signatures in command voltage signals, determining phase resistances, and identifying phases with imbalances, allowing for preventative actions such as rebalancing or stopping the motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronous motor drives operate without resistance imbalance detection, then the system structure remains simple, but parameter imbalance causes undesirable current and torque pulsations leading to sub-optimal control
Solution Approach 1:
The patent implements a feedback mechanism where the controller continuously monitors command voltage signals to detect resistance imbalance signatures. The system measures the actual command voltage signals, compares them against expected values, and uses the detected imbalances to adjust control parameters in real-time, thereby maintaining optimal control performance despite parameter variations.
Solution Approach 2:
The system performs self-diagnosis by automatically detecting resistance imbalances within its own operation. The controller uses the existing command voltage signals to identify imbalance signatures without requiring external testing equipment or additional sensors, enabling the system to monitor and compensate for its own parameter deviations during normal operation.
2Manufacturing precision
If resistance imbalance detection and correction systems are implemented, then manufacturing precision requirements are met, but device complexity increases
Solution Approach 1:
The patent changes control parameters dynamically based on detected resistance imbalances. When imbalances are detected in the command voltage signals, the controller adjusts current control parameters and voltage compensation values to compensate for the variations, thereby maintaining consistent performance across different motor units without requiring precise manufacturing tolerances.
3Productivity
If real-time resistance imbalance detection is performed, then current and torque control optimization is achieved, but processing requirements and system complexity increase
Solution Approach 1:
The patent makes the controller multi-functional by enabling it to perform both normal motor control functions and resistance imbalance detection functions using the same hardware resources. The controller processes command voltage signals for both control purposes and diagnostic purposes simultaneously, eliminating the need for separate detection equipment and reducing overall system complexity.
Data Source
AI summary
A system for controlling a synchronous motor drive may be configured to receive a command voltage signal and to identify, in the synchronous motor drive, a resistance imbalance signature from the command voltage signal. The system may determine, based on the resistance imbalance signature, respective phase resistances that correspond to phases of a synchronous motor of the synchronous motor drive. Each respective phase resistance may include a phase transistor resistance and a phase winding resistance. The system may identify, based on the phase resistances and an estimated average resistance between the phases of the synchronous motor, one or more phases of the synchronous motor that correspond to one or more phase resistances representing a resistance imbalance.