Drive Motor Controller Using Stator Heat for Battery Warming
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Solution Overview
Problem
In electric vehicles, conventional heating systems for power batteries in low-temperature environments are costly and inefficient, as they require additional heating apparatuses to maintain optimal operating temperatures.
Innovation Solution
A controller for the drive motor that utilizes heat generated by the motor's stator and rotor windings to warm the power battery through a cooling loop, eliminating the need for additional heating apparatuses by adjusting the output current based on battery temperature and voltage conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an additional heating apparatus (PTC thermistor) is used to heat the power battery in low-temperature environments, then the battery temperature can be maintained within the optimal operating range, but the system cost increases and the device complexity increases
Solution Approach 1:
The drive motor is made to serve dual functions: propulsion and heating. By controlling the inverter circuit to output current to the stator winding, the motor generates Joule heat that is transferred to the power battery through the cooling loop, eliminating the need for a separate heating apparatus
Solution Approach 2:
The drive motor utilizes its own generated heat (Joule heat from stator winding) to heat the power battery, making the system self-sufficient for thermal management without requiring external heating components
2Temperature
If an additional heating apparatus (PTC thermistor) is used to heat the power battery, then the battery can be heated in low-temperature environments, but the system cost increases
Solution Approach 1:
The drive motor is made to serve dual functions: propulsion and heating. By controlling the inverter circuit to output current to the stator winding, the motor generates Joule heat that is transferred to the power battery through the cooling loop, eliminating the need for a separate heating apparatus
Solution Approach 2:
The heating function is extracted from a separate heating apparatus and integrated into the drive motor system, utilizing existing components (inverter circuit, stator winding, cooling loop) to eliminate the need for additional heating equipment
3Temperature
If the output current of the inverter circuit is increased to generate more heat in the stator winding, then the heating rate of the power battery increases, but the energy consumption increases
Solution Approach 1:
The Joule heat generated by the stator winding, which is typically considered waste heat or loss, is converted into a useful resource for heating the power battery, transforming an energy loss into a beneficial thermal source
Solution Approach 2:
The cooling loop acts as an intermediary medium to transfer heat from the stator winding to the power battery, enabling thermal energy transfer without direct contact and facilitating efficient heat exchange
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 solution effectively increases the heating rate of the power battery, reducing costs and improving efficiency by leveraging the motor's generated heat to maintain optimal battery temperatures without additional heating systems.
Implementation Method 1
the heat generated by the three-phase stator winding of the drive motor... the three-phase stator winding may perform heat exchange with the power battery through a cooling loop
Implementation Method 2
the three-phase stator winding may perform heat exchange with the power battery through a cooling loop
Data Source
AI summary
A controller for a drive motor and a related device thereof. In response to that a temperature of the power battery is greater than or equal to a preset battery temperature, the controller controls an output current of the inverter circuit, so that the drive motor outputs torque to drive a wheel. In response to that a temperature of the power battery is less than a preset battery temperature, the controller adjusts an output current of the inverter circuit based on a result of comparison between a voltage of the power battery and a preset battery voltage, to control the output current of the inverter circuit to increase heat generated by the three-phase stator winding of the drive motor. The power battery may be heated by using the heat generated by the drive motor, thereby reducing costs.