Motor Controller Partial Discharge Inception Voltage Calculation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electric vehicles without boost converters face insulation coating deterioration and shortened motor life due to voltage exceeding partial discharge inception voltage, especially in varying atmospheric conditions, which existing motor controllers fail to address effectively without increasing component costs.
Innovation Solution
A motor controller with an electronic control unit, atmospheric pressure sensor, coil temperature sensor, and voltage sensor calculates partial discharge inception voltage and adjusts coil temperature limits or battery charging rates to prevent insulation coating deterioration without a boost converter, thereby maintaining motor performance and extending its lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a boost converter is used to reduce voltage applied to the motor, then the insulation performance of the motor coil is protected, but the component cost increases
Solution Approach 1:
The patent extracts the voltage reduction function from a dedicated boost converter component and implements it through software control algorithms in the ECU. The control unit calculates partial discharge inception voltage based on atmospheric pressure and coil temperature, then limits motor output when voltage exceeds this threshold, thereby protecting insulation without requiring additional hardware
Solution Approach 2:
The patent replaces the electrical hardware solution (boost converter circuit) with a control system approach using sensors and software algorithms. Atmospheric pressure sensors, coil temperature sensors, and voltage sensors feed data to the ECU, which processes the information and dynamically adjusts motor output to prevent partial discharge, substituting physical voltage conversion with intelligent control
2Reliability
If the voltage applied to the motor is reduced to prevent partial discharge, then the insulation coating is protected, but the motor output performance decreases
Solution Approach 1:
The patent implements dynamic control where the ECU continuously monitors atmospheric pressure, coil temperature, and applied voltage, then dynamically adjusts motor output limits in real-time. The partial discharge inception voltage is recalculated based on changing environmental conditions, allowing the motor to operate at full power when conditions are safe and reducing power only when necessary to prevent insulation breakdown
Solution Approach 2:
The system performs preliminary calculations of partial discharge inception voltage based on atmospheric pressure and temperature before partial discharge can occur. By predicting the threshold voltage in advance and proactively limiting motor output before exceeding this threshold, the system prevents insulation damage while maintaining optimal performance within safe operating parameters
3Reliability
If the coil temperature upper limit value is reduced to raise partial discharge inception voltage, then the insulation performance is maintained, but the motor operation flexibility is limited
Solution Approach 1:
The patent changes the reference parameter from a fixed coil temperature upper limit to a dynamically calculated partial discharge inception voltage that incorporates atmospheric pressure and temperature. The ECU adjusts the effective temperature limit based on real-time environmental conditions, allowing higher operating temperatures when atmospheric pressure and temperature conditions support higher partial discharge thresholds, thereby maintaining insulation protection while improving operational flexibility
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
The motor controller effectively prevents insulation coating deterioration and motor lifespan shortening by regulating coil temperature and reducing voltage, ensuring reliable operation without the need for expensive boost converters, thus maintaining vehicle performance and extending motor life.
Implementation Method 1
an atmospheric pressure sensor configured to detect an atmospheric pressure
Implementation Method 2
a coil temperature sensor configured to detect a coil temperature of a motor
Implementation Method 3
a voltage sensor configured to detect a voltage applied to the motor
Implementation Method 4
the partial discharge inception voltage depends on the atmospheric pressure and the coil temperature
Implementation Method 5
regulates a rise in the coil temperature to raise the partial discharge inception voltage, in response to the voltage applied to the motor exceeding the partial discharge inception voltage. This configuration prevents deterioration of the insulation performance of the insulation coating
Data Source
AI summary
A motor controller includes an atmospheric pressure sensor, a coil temperature sensor, and a voltage sensor configured to detect a voltage applied to a motor. The motor controller calculates a partial discharge inception voltage in accordance with the atmospheric pressure and the coil temperature, limits an output of the motor in response to the coil temperature exceeding a preset coil temperature upper limit value, and reduces the coil temperature upper limit value in response to a voltage exceeding the partial discharge inception voltage.