Doubly Fed Induction Machine With Dual Inverters for Slip Control
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Solution Overview
Problem
Existing doubly fed induction machines for series hybrid applications face challenges in efficiently managing power distribution and electrical slip across various operating modes, which affects the overall performance and efficiency of the hybrid drivetrain.
Innovation Solution
The proposed solution involves a doubly fed induction machine with a stator and rotor equipped with multiple windings and slip rings, connected to first and second inverters that provide multi-phase power. This setup allows for adjustable electrical slip and efficient power management across motoring, regeneration, and electric driving modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a doubly fed induction machine is used in series hybrid applications, then power distribution and electrical slip management can be improved, but the device complexity increases due to multiple inverters and slip rings
Solution Approach 1:
The patent divides the power conversion system into two separate inverters: a first inverter connected to the stator windings and a second inverter connected to the rotor windings through slip rings. This segmentation allows independent control of stator and rotor power flows, enabling efficient power distribution across different operating modes while managing complexity through modular architecture
Solution Approach 2:
The doubly fed induction machine is designed to operate in multiple modes (motoring, regeneration, electric driving) using the same hardware configuration. The machine universally handles power flow in both directions and adjusts electrical slip dynamically, eliminating the need for separate systems for different operating conditions
2Productivity
If adjustable electrical slip is implemented across different operating modes, then performance and efficiency are enhanced, but the control difficulty increases
Solution Approach 1:
The patent implements dynamic adjustment of electrical slip by controlling the frequency and phase of the second inverter output relative to the first inverter. The system adapts slip values based on operating mode (positive slip for motoring, negative slip for electric driving), enabling performance optimization while the control system automatically manages the complexity through mode-based control strategies
Solution Approach 2:
The system uses feedback from the hybrid drivetrain operating conditions to adjust electrical slip dynamically. The control system monitors power flow directions, speed requirements, and operating mode to automatically optimize slip values, reducing control difficulty through closed-loop regulation
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
The solution enables efficient power distribution and adjustable electrical slip, enhancing the performance and efficiency of the hybrid drivetrain across different operating modes, thereby improving the overall energy management and propulsion capabilities.
Implementation Method 1
a first inverter arranged to provide a first multi-phase power to the plurality of stator windings
Implementation Method 2
a second inverter arranged to provide a second multi-phase power to the plurality of rotor windings through a plurality of slip rings
Implementation Method 3
The second multi-phase power is provided to the plurality of slip rings through a plurality of brushes
Implementation Method 4
The generator is drivingly connected to the internal combustion engine and arranged to provide a third multi-phase power to the stator windings and to the first inverter
Data Source
AI summary
A hybrid drivetrain for a vehicle includes a doubly fed induction machine, a first inverter and a second inverter. The doubly fed induction machine includes a stator with a plurality of stator windings and a rotor. The rotor includes a plurality of rotor windings and a plurality of slip rings electrically connected to the plurality of rotor windings. The first inverter is arranged to provide a first multi-phase power to the plurality of stator windings and the second is inverter arranged to provide a second multi-phase power to the plurality of rotor windings through the plurality of slip rings. In an example embodiment, the second multi-phase power is provided to the plurality of slip rings through a plurality of brushes. In an example embodiment, a quantity of the plurality of slip rings is exactly three.