Dual-Winding Motor Voltage Switching Without Torque Interruptions
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Solution Overview
Problem
Existing vehicle propulsion systems experience voltage interruptions when transitioning between different voltage levels applied to electric motors, leading to torque disruptions and impaired drivability.
Innovation Solution
A system with a dual winding electric motor and a battery system comprising two battery assemblies, connected through a switching system with independently controllable switching devices, allows for smooth transitions between voltage levels by sequentially operating the switching devices to change the voltage without creating torque holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If voltage switching is performed in conventional propulsion systems, then voltage level transition is achieved, but torque interruptions occur
Solution Approach 1:
The electric motor is divided into two independent winding sets (first and second windings), each capable of being energized separately. This segmentation allows one winding to maintain torque production while the other undergoes voltage switching, thereby preventing torque interruptions during transition.
Solution Approach 2:
The system maintains continuous torque production by ensuring that while one winding set is being switched, the other winding set remains energized and continues to produce torque. This overlap ensures uninterrupted useful action during the voltage transition process.
2Device complexity
If a single winding system is used for voltage switching, then system complexity is reduced, but voltage transition causes torque holes
Solution Approach 1:
The motor windings are segmented into two independent sets, allowing independent control and energization. This enables one set to be switched while the other maintains operation, avoiding torque holes despite the increased winding complexity.
Solution Approach 2:
The system prepares for voltage switching by having a second winding set ready to be energized before the first winding is de-energized. This preliminary action ensures that torque production continues without interruption during the transition.
3Device complexity
If voltage switching is performed sequentially in a single winding, then switching simplicity is maintained, but drivability is impaired due to torque disruptions
Solution Approach 1:
The propulsion system is segmented into two independent winding-sverter channels, allowing parallel operation. This enables smooth transition between voltage levels while maintaining continuous torque output, preserving drivability during switching events.
Solution Approach 2:
The system dynamically switches between different winding configurations and voltage levels based on operational requirements. The controller can adaptively manage which winding is energized and at what voltage level, optimizing performance and maintaining drivability throughout the transition.
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
Enables voltage switching or adjustment without torque interruptions, ensuring smooth operation and optimal voltage levels for varying torque and speed conditions, improving propulsion systems by maintaining continuous drivability.
Implementation Method 1
an electric motor having a first set of windings and a second set of windings... operate the electric motor to produce torque used to propel vehicle
Data Source
AI summary
A system for controlling a propulsion system of a vehicle includes a switching system including a first switching device connecting a battery system to a first set of windings of an electric motor, and a second switching device connecting the battery system to a second set of windings. The system also includes a controller configured to transition the propulsion system from an initial propulsion mode in which an initial voltage is applied to the electric motor, to a target mode in which a target voltage is applied. The transitioning includes controlling the first switching device to provide current to the first set of windings at the initial voltage to produce torque, and subsequently controlling the second switching device to cause the battery system to apply the target voltage to the second set of windings while the current is provided to the first set of windings at the initial voltage.