Electric Motor State Monitoring via Rotor-Induced Pressure Difference
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Solution Overview
Problem
Existing methods fail to reliably detect contamination and leaks in electric motors, which can lead to premature failure due to impaired ventilation and cooling, affecting the motor's lifespan and operational efficiency.
Innovation Solution
A method utilizing a pressure difference caused by the rotor's rotational movement within the electric motor to determine its state, employing a pressure sensor system and rotational speed detection to calculate a parameter representative of the motor's condition, allowing for the identification of contamination and leaks with minimal effort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If particles and dust accumulate in the electric motor, then ventilation effects are weakened or stopped, but detection of this contamination is not reliable with existing methods
Solution Approach 1:
The patent replaces complex mechanical detection systems with a simple pressure sensor to detect contamination. By measuring pressure differences in the air space between the rotor and stator, the system can reliably detect ventilation impairments caused by particle accumulation without requiring complex mechanical sensors or visual inspection systems.
Solution Approach 2:
The patent introduces pressure as an intermediary parameter to indirectly detect contamination. Instead of directly measuring particle accumulation or ventilation flow, the system measures pressure differences in the air space, which serve as a reliable indicator of ventilation effectiveness and contamination levels.
2Reliability
If leaks occur in the electronics housing, then moisture penetration can destroy electronics, but existing methods cannot reliably detect these leaks
Solution Approach 1:
The patent replaces complex leak detection systems with a simple pressure sensor. By monitoring pressure differences in the sealed air space, the system can reliably detect housing leaks that compromise electronics protection without requiring complex acoustic or visual inspection systems.
Solution Approach 2:
The patent uses pressure difference as an intermediary indicator to detect housing leaks. Instead of directly detecting moisture penetration or electronic failures, the system measures pressure changes in the air space that result from leaks, providing early warning before critical damage occurs.
3Temperature
If natural convection cooling is used at cooling fins, then cooling is passive and simple, but cooling effectiveness is negatively influenced by contamination
Solution Approach 1:
The patent implements a feedback mechanism by continuously monitoring pressure differences and using this information to assess cooling effectiveness. The pressure sensor provides real-time feedback on ventilation status, allowing the system to detect when contamination is impairing natural convection cooling and triggering appropriate responses.
Solution Approach 2:
The patent uses pressure difference as an intermediary parameter to monitor cooling effectiveness. Instead of directly measuring temperature or air flow, the system measures pressure changes that indicate the state of natural convection cooling, providing a reliable indicator of cooling performance stability.
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 and efficient determination of the electric motor's state, facilitating preventive measures and improving predictive maintenance by quantifying the extent of contamination and leaks, thus extending the motor's lifespan and maintaining operational efficiency.
Implementation Method 1
a pressure difference relative to an environment of the electric motor is caused in an air space within the electric motor due to a rotational movement of the rotor
Implementation Method 2
a pressure sensor system...designed to determine an actual pressure difference between an environment of the electric motor and the air space
Implementation Method 3
a rotational speed detection system...designed to determine an actual rotational speed of the rotor
Data Source
AI summary
A method for determining a state of an electric motor having a stator (2) and a rotor (3) rotatably mounted relative to the stator (2) is disclosed. Due to a rotary motion of the rotor (3), a pressure difference (p) relative to an environment (15) of the electric motor (1, 1′, 1″, 1′″) is caused in an air space (16) inside the electric motor (1, 1′, 1″, 1′″). Here, in a normal state of the electric motor (1, 1′, 1″, 1′″), the pressure difference depends on an actual rotational speed (n) of the rotor (3). A corresponding electric motor suitable for carrying out this method is disclosed, wherein the electric motor may be part of a fan.