Single-Phase Converter Control for Motor Rotation Direction Detection
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Solution Overview
Problem
In multi-phase electric motor systems, existing technologies face challenges in determining the direction of rotation and rotor position without direct measurements, especially when single faults occur, leading to potential failures in drive power due to the lack of redundancy in sensor systems and converter independence.
Innovation Solution
The implementation of a multi-lane approach with three DC-isolated single-phase converters, each supplied independently, and a shared sensor unit that measures all phase currents and voltages, allowing for independent operation and fault tolerance, with self-starting power supply and optical or coreless transformer data connections for redundancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a three-phase converter is broken up into three DC-isolated single-phase converters, then fault tolerance and independence of converters are improved, but the ability to determine rotor position and direction of rotation without direct measurements deteriorates
Solution Approach 1:
The patent merges the sensor units into a shared resource that serves all three single-phase converters. Instead of each converter having its own isolated sensors, a common sensor unit measures all phase currents and provides this information to all converters, enabling them to independently determine rotor position and direction while maintaining fault tolerance through redundancy
Solution Approach 2:
The shared sensor unit performs multiple functions: it provides current measurements for fault detection, enables rotor position determination for all converters, and supports direction of rotation detection. This multi-functional approach allows the system to maintain full functionality with shared sensing resources across the distributed converter architecture
2Reliability
If each single-phase converter operates independently with its own sensors, then converter independence and fault isolation are improved, but the complexity of the sensor system and device architecture increases
Solution Approach 1:
The sensor unit is designed as a universal resource that serves all three converters simultaneously. By making the sensor unit multi-functional and shared, the patent reduces the total number of sensors needed while maintaining the ability of each converter to operate independently with full information about the system state
Solution Approach 2:
The shared sensor unit acts as an intermediary that provides current measurements to all converters. This mediator approach allows converters to maintain independence in control while sharing sensing resources, reducing overall system complexity without sacrificing fault isolation capabilities
Data Source
AI summary
An arrangement for detecting a direction of rotation of a multi-phase electric motor includes a plurality of single-phase converters. Each single-phase converter of the plurality of single-phase converters supplies one phase of the multi-phase electric motor with current. The arrangement also includes two sensor units that are configured to determine actual values of the phase currents of the multi-phase electric motor and to transmit the actual values to the plurality of single-phase converters. The arrangement also includes a monitoring and control unit in each converter of the plurality of single-phase converters. The monitoring and control unit is configured and programmed to determine the direction of rotation and a speed of rotation of the multi-phase electric motor from the actual values.