Rotor Measurement Unit Standstill Powering via Induction
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Solution Overview
Problem
Existing fault condition diagnostics for synchronous machines are challenging due to complicated installation procedures for rotor measurement equipment and inability to detect early-stage failures like inter-turn short circuits and field winding issues.
Innovation Solution
A rotor measurement unit powered by the inherent induction in AC/AC exciter electrical machines, using a multi-phase exciter rectifier to rectify AC current from the exciter rotor winding to feed the field winding, allowing for measurement during standstill operations and enabling detection of rotor parameters such as temperature and faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rotor measurement equipment is installed to detect faults early, then reliability is improved, but device complexity increases
Solution Approach 1:
The measurement equipment is merged with the existing rotor structure, utilizing the rotor's inherent components (windings, shaft) as part of the measurement system. This integration eliminates separate installation steps and reduces overall device complexity while maintaining fault detection capability
Solution Approach 2:
The rotor structure serves multiple functions: it generates electromagnetic fields for motor operation and simultaneously acts as the measurement platform for fault detection. This multi-functionality eliminates the need for dedicated measurement equipment installation, resolving the contradiction between reliability improvement and device complexity
2Measurement precision
If measurement equipment is powered during standstill operation, then measurement precision is improved, but use of energy increases
Solution Approach 1:
The measurement equipment is powered by the rotor's own electromagnetic field without requiring external power sources. The system uses its inherent operational energy to sustain measurement functions during standstill, achieving precise fault detection without additional energy consumption
Solution Approach 2:
The power supply system is merged with the measurement system, using the same electromagnetic field that drives the motor to power the measurement equipment. This integration allows measurement during standstill without separate power provisioning, balancing measurement precision with energy efficiency
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables simpler and effective powering of rotor measurement units during standstill operations, allowing for early detection of faults and improved maintenance scheduling, reducing downtime and capital losses.
Implementation Method 1
based on the inherent induction present in such electrical machines due to the electromagnetic interaction between the exciter stator winding and the exciter rotor winding
Implementation Method 2
a multi-phase exciter rectifier arranged on the rotor assembly, and configured to rectify an AC current from the exciter rotor winding to feed the field winding with a DC current
Data Source
Figure 1
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AI summary
The present disclosure relates to a rotor measurement unit (1) configured to be mounted onto a rotor (12) of an electrical machine (11) having an AC/AC exciter (13) and a multi-phase exciter rectifier (17), for measuring a rotor parameter. The rotor measurement unit (1) comprises a measurement system configured to measure the rotor parameter, electronic circuitry (5) configured to receive a rotor parameter measurement from the measurement system, and a first and a second power supply terminal configured to be connected to a winding of the rotor assembly (12) to enable powering of the electronic circuitry (5) during standstill operation of the electrical machine (11).