Dynamic Temperature Limitation for Motor Fan Regulators
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for temperature limitation in actuating devices for electric motors, particularly fan regulators in motor vehicles, are too complex and expensive for low-cost applications, leading to premature activation and potential damage due to fixed maximum temperature settings that do not account for varying operating conditions such as high ambient temperatures and elevated voltages.
Innovation Solution
Implementing a dynamic temperature limitation method that adjusts the maximum permissible temperature based on operating parameters like current and voltage, allowing for real-time responses to specific operating states and conditions, using a temperature controller and components with temperature-dependent properties to prevent power loss and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed maximum temperature is used for temperature limitation, then the protective device is not actuated prematurely under high ambient temperature conditions, but the soldering points and current-carrying elements are under extreme loads which can destroy them
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed temperature threshold to a dynamic temperature threshold that adapts to operating conditions. The maximum temperature value is made variable based on ambient temperature and operating current, allowing the protection level to change dynamically rather than remaining static. This resolves the contradiction by enabling the system to tolerate higher temperatures under high ambient conditions while providing stricter protection under normal conditions.
Solution Approach 2:
The patent changes the parameter of maximum temperature from a constant value to a variable value that depends on ambient temperature and operating current. By introducing parameter changes based on operating conditions, the system can adjust its protection threshold to match the actual thermal stress on components, preventing both premature activation and extreme load damage.
2Reliability
If the maximum temperature is set high to avoid premature activation, then the protective device remains inactive under high ambient temperature, but power loss in power semiconductors increases rapidly at high operating voltage
Solution Approach 1:
The patent implements feedback by continuously monitoring operating voltage and adjusting the maximum temperature threshold accordingly. When operating voltage exceeds a threshold value, the maximum temperature is reduced, creating a feedback loop that responds to electrical conditions. This prevents excessive power loss in power semiconductors by lowering the temperature tolerance when voltage stress is high, while maintaining higher tolerances under normal voltage conditions.
Solution Approach 2:
The patent changes the maximum temperature parameter dynamically based on operating voltage levels. By introducing voltage-dependent parameter changes, the system adapts its thermal protection threshold to match electrical stress conditions, preventing rapid power loss accumulation in power semiconductors during high-voltage operation.
3Reliability
If existing temperature limitation methods are used, then temperature protection is provided, but the methods are too complex and expensive for low-cost and/or small electric motors
Solution Approach 1:
The patent applies universality by making the temperature limitation system multi-functional. The same control mechanism handles both ambient temperature compensation and operating current-based thermal protection, as well as voltage-dependent power semiconductor protection. By combining multiple protection functions into a single adaptive system, the patent reduces overall system complexity and cost while maintaining comprehensive temperature protection.
4Reliability
If the actuating device is designed larger to accommodate higher requirements, then the device can handle extreme loads, but the cost increases and the system is oversized
Solution Approach 1:
The patent applies dynamics by making the temperature threshold adaptive rather than static. This allows the actuating device to operate reliably under extreme loads without requiring an oversized design, because the protection threshold dynamically adjusts to match actual operating conditions. The device maintains appropriate protection levels across varying loads without needing excessive capacity built-in from the start.
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
This approach results in a cost-optimized design that extends the service life of actuating devices by preventing power component damage and ensuring reliable operation under various conditions, without requiring oversized systems.
Implementation Method 1
an NTC resistor which measures the temperature of the actuating device
Implementation Method 2
a power semiconductor element whose gate is influenced by an output of the temperature controller
Data Source
AI summary
The invention relates to a method for temperature limitation according to the current and/or voltage, for an actuating device (10) associated with an electric motor (M), especially a fan regulator (12) of a motor vehicle, the temperature limitation being carried out according to at least one operating parameter of the motor (M). The invention also relates to a corresponding device (1) and a fan regulator (12).