Dual Drive Motor Control Unit for Low-Loss EV Load Switching
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Solution Overview
Problem
The motor control unit in electric vehicles experiences significant energy loss due to the high loss of IGBT components, which reduces the efficiency and endurance of electric vehicles, especially under varying load conditions.
Innovation Solution
A motor control unit with two drive circuits, one using IGBT components for high current withstand capability and another using wide-band-gap semiconductor components like SiC-MOSFET or GaN transistors for low loss, where the control unit switches between them based on load conditions to optimize energy efficiency and reduce component costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If IGBT components are used in the motor control unit, then the current withstand capability is improved, but the energy loss increases
Solution Approach 1:
The motor control unit is divided into multiple independent drive circuits, each handling specific motor phases. This segmentation allows different circuit topologies to be optimized for different functions: some circuits use IGBTs for high current phases while others use low-loss topologies for phases requiring less current, thereby reducing overall energy loss while maintaining sufficient current withstand capability.
Solution Approach 2:
Different drive circuits within the same motor control unit are designed with different power component types according to their specific functional requirements. Circuits handling high-current phases use IGBT components for robust current withstand capability, while circuits handling lower-current phases use topologies with inherently lower loss characteristics, achieving local optimization of both current capability and energy efficiency.
2Device complexity
If a single drive circuit topology is used, then the device complexity is reduced, but the adaptability to different load conditions deteriorates
Solution Approach 1:
The motor control unit employs multiple drive circuits with different power component characteristics that can be dynamically selected or combined based on real-time load conditions. The control system adjusts which circuits are active and how they are configured according to the motor's current demands, enabling the system to adapt optimally to varying load conditions while maintaining manageable complexity through standardized circuit designs.
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 improves the efficiency of the motor control unit by reducing energy loss, enhancing the endurance of electric vehicles, and providing fault tolerance by utilizing the advantages of different power components based on load conditions.
Implementation Method 1
another using wide-band-gap semiconductor components like SiC-MOSFET or GaN transistors for low loss
Implementation Method 2
a function of the motor control unit is to invert a direct current output by the power battery pack into an alternating current, and supply the alternating current to the motor
Data Source
AI summary
A device for controlling a motor is provided. A type of a power component in a first drive circuit of the device is different from a type of a power component in a second drive circuit of the device. A loss of the power component in the first drive circuit is greater than a loss of the power component in the second drive circuit. When determining that a load of the motor is less than a preset load, a controller of the device controls the first drive circuit to stop working and controls the second drive circuit to start to work. When determining that the load of the motor is greater than or equal to the preset load, the controller controls both the first drive circuit and the second drive circuit to start to work.