Wind Turbine Generator Rotor Temperature Monitoring Without Slip Rings
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Solution Overview
Problem
Existing temperature monitoring methods for electrical generators in wind turbines are prone to failure due to reliance on slip rings, which are susceptible to wear and require frequent replacement.
Innovation Solution
A temperature monitoring system using a passive control element on the rotor and a receiving unit on the stator that detects mechanical or optical changes in response to temperature variations, allowing for slip ring-free communication between the rotor and stator, utilizing mechanisms such as movable pins, magnetic elements, and optical sensors to transmit temperature data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a slip ring is used to transmit temperature signals from the rotor to the stator, then temperature monitoring is enabled, but the system reliability deteriorates due to wear and frequent replacement needs
Solution Approach 1:
The patent extracts the problematic slip ring component from the temperature monitoring system and replaces it with a contactless detection approach. The receiving unit on the stator detects temperature-related changes (magnetic field variations, optical changes, or mechanical displacements) from the rotor without physical contact, thereby eliminating wear and maintenance requirements while maintaining system reliability.
Solution Approach 2:
The patent replaces the mechanical slip ring system with non-contact detection methods. Instead of mechanical electrical contact through slip rings, the system uses magnetic sensors, optical sensors, or capacitive sensors to detect rotor temperature changes, substituting mechanical transmission with field-based detection to eliminate wear.
2Reliability
If a passive control element is used on the rotor to detect temperature changes, then the system becomes slip ring-free, but the device complexity increases due to additional components
Solution Approach 1:
The patent applies local quality by placing a simple passive control element (such as a temperature-sensitive magnetic element, thermal expansion element, or color-changing material) at the specific location on the rotor where temperature monitoring is needed. This localized approach keeps the added complexity minimal while achieving reliable temperature detection.
Solution Approach 2:
The passive control element acts as an intermediary that converts rotor temperature changes into detectable signals (magnetic field changes, optical changes, or mechanical displacements) that can be detected by the receiving unit on the stator, enabling indirect but reliable temperature measurement without direct electrical contact.
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 reliable temperature monitoring without slip rings, reducing maintenance needs and ensuring timely detection of excessive heating, thereby preventing generator damage.
Implementation Method 1
a temperature change on the rotor causes a mechanical or optical change in the control element
Implementation Method 2
the movable pin comprises a magnetic element and the receiving unit comprises a magnetic sensor which detects an approach of the magnetic element of the control element
Implementation Method 3
the passive control element comprises a temperature measuring strip that changes color depending on the detected temperature
Data Source
Figure 1
Figure 2~3A
Figure 3B~3C
AI summary
A method is provided for monitoring the temperature of an electrical generator (200) of a wind turbine (100), wherein the generator (200) has a stator (220), a rotor (210), and a temperature monitoring unit (300). The temperature monitoring unit has a passive control element (310) on the rotor (210) and a receiving unit (320) on the stator (220). A temperature change on the rotor (210) leads to a mechanical or optical change in the passive control element (310). The mechanical or optical change in the passive control element (310) is detected by the receiving unit (320) on the stator (220).