Electric Propulsion Motor Control for Series Parallel Switching
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Solution Overview
Problem
Existing mobile machines with electric propulsion motors face compromises when consistently connecting them in series or parallel, as the benefits of each configuration vary by circumstance, leading to suboptimal performance and inefficiencies.
Innovation Solution
A mobile machine with power-system controls that selectively switch between series and parallel connections of electric propulsion motors based on location and operational modes, using distinct generator-control strategies to optimize power distribution and reduce unnecessary energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If electric propulsion motors are connected in series, then voltage utilization is improved, but current delivery capability deteriorates
Solution Approach 1:
The system dynamically switches between series and parallel motor connections based on real-time operating conditions such as speed, load, and terrain. The control system adjusts the electrical configuration from static to dynamic, allowing the motors to operate in series during high-speed cruising for optimal voltage utilization, and in parallel during high-torque situations for maximum current delivery capability.
2Quantity of substance
If electric propulsion motors are connected in parallel, then current delivery capability is improved, but voltage utilization deteriorates
Solution Approach 1:
The control system implements dynamic reconfiguration of motor connections, switching from parallel to series configuration when operating conditions change. This allows the system to capitalize on high current delivery in parallel mode during acceleration or heavy load, then transition to series mode for improved voltage utilization during steady-state high-speed operation.
3Device complexity
If a single motor-connection strategy is used, then device complexity is reduced, but adaptability to different operating conditions deteriorates
Solution Approach 1:
The system employs multiple motor-connection strategies that are selectively activated based on operating conditions. The control system monitors parameters such as speed, acceleration, and load, then automatically selects the appropriate connection configuration (series, parallel, or intermediate), providing adaptability without requiring complex manual intervention.
Solution Approach 2:
The control system continuously monitors operating conditions and uses feedback signals to determine the optimal motor connection strategy. Based on real-time data from sensors measuring speed, current, voltage, and load, the system adjusts the electrical configuration to match current operational requirements, ensuring optimal performance across varying conditions.
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 enhances performance by adapting power distribution to specific operational needs, reducing fuel consumption and wear on generator units while maintaining efficient propulsion, particularly in varying terrain and operational conditions.
Implementation Method 1
an electric generator, two pairs of electric propulsion motors, and a circuit for supplying electricity from the electric generator to the electric propulsion motors
Implementation Method 2
two pairs of electric propulsion motors, and a circuit for supplying electricity from the electric generator to the electric propulsion motors
Data Source
AI summary
A mobile machine may include one or more generator units, a plurality of electric propulsion motors, and a power-transfer system operable to transfer electricity from one or more of the generator units to one or more of the electric propulsion motors. The mobile machine may also include power-system controls that control the connection of the one or more electric propulsion motors to the power-transfer system. The power-system controls may selectively use a first motor-connection strategy for controlling when one or more groups of the electric propulsion motors are connected to the power-transfer system in series, and the power-system controls may selectively use a second motor-connection strategy for controlling when one or more groups of the electric propulsion motors are connected to the power-transfer system in series.