Induction Motor Cold-Start Heating for Fuel Cell Stacks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fuel cell vehicles face challenges in rapidly starting in cold conditions due to ice formation from remaining water in the fuel cell stack, and existing heating methods require additional components and increased manufacturing costs, as well as prolonged heating times.
Innovation Solution
A method and system utilizing an induction motor to rapidly increase the temperature of the fuel cell stack by maximizing iron loss through increased angular speed of its rotating magnetic field, with a torque eliminator to manage the resulting torque, allowing for efficient cold-start operation without additional heaters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a heater is installed on the suction pipeline to heat the fuel cell stack during cold start, then the temperature of the fuel cell stack can be increased, but additional components are required and manufacturing cost increases
Solution Approach 1:
The induction motor serves dual purposes: driving the air blower function and generating heat through iron loss during rapid angular speed increase. The system uses its own existing component (induction motor) to provide the heating function, eliminating the need for separate heating components and achieving self-service during cold start conditions
Solution Approach 2:
The induction motor is made multi-functional by utilizing its iron loss characteristic for heating purposes during cold start, while maintaining its primary function of driving the air blower. This allows one component to serve multiple functions, reducing overall system complexity
2Temperature
If a heater is used to heat the fuel cell stack during cold start, then the temperature can be increased, but the heating time becomes substantially prolonged
Solution Approach 1:
The system employs periodic or rapid transient action by rapidly increasing the angular speed of the induction motor's rotating magnetic field to maximize iron loss temporarily during cold start, rather than using slow continuous heating. This rapid transient heating action significantly reduces the time required to raise the fuel cell stack temperature
Solution Approach 2:
The system changes the operating parameters of the induction motor by rapidly increasing its angular speed to a specific range that maximizes iron loss, thereby transforming it from a standard motor operation mode to a rapid heating mode, achieving fast temperature increase
3Temperature
If the angular speed of the rotating magnetic field is rapidly increased to maximize iron loss for heating, then temperature increase is rapid, but torque is generated that must be eliminated
Solution Approach 1:
The harmful torque generated during rapid heating is extracted and eliminated separately using a torque eliminator device. This allows the beneficial heating effect to be maintained while removing the adverse torque effect that would otherwise interfere with vehicle operation
Solution Approach 2:
The system separates the heating function from the drive function by using a torque eliminator to isolate and remove the torque component, allowing the induction motor to operate in rapid heating mode without affecting vehicle propulsion or causing operational interference
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 enables rapid temperature increase of the fuel cell stack, stabilizes the induction motor operation, and reduces the time required for cold-starting fuel cell vehicles by converting electrical energy into heat efficiently, thus overcoming the limitations of existing heating methods.
Implementation Method 1
rapidly increasing an angular speed of a rotating magnetic field of an induction motor configured to maximize iron loss of the induction motor, which may result in an increase in a temperature of a fuel cell stack
Data Source
AI summary
A fuel cell system and a method for controlling the same are provided. The method includes rapidly increasing an angular speed of a rotating magnetic field of an induction motor to maximize iron loss of the induction motor, thereby resulting in an increase in the temperature of a rise cell stack. The method further includes eliminating torque of a driving motor generated by an increase in the angular speed of the rotating magnetic field, using a torque eliminator. The torque eliminator includes a P-stage reducer or a hydraulic break.