Motor Inverter Boost Charging Using 54-Slot Stator Windings
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Solution Overview
Problem
Existing electric vehicle charging systems require additional DC boost charging circuits, increasing structural complexity, volume, and cost, and existing AC electric machines fail to meet boost charging requirements without additional inductive elements, while also needing higher rotation speeds.
Innovation Solution
An electric machine control circuit using three-phase AC electric machines with increased wire slots in the stator, functioning as an inductive energy storage element in both electric drive mode and a DC boost mode, forming a DC boost charging circuit with a three-phase inverter, where the windings are used as an inductive energy storage element, and the three-phase inverter together form a DC boost charging circuit, eliminating the need for additional inductive elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an additional DC boost charging circuit is provided, then the boost charging function is realized, but the structural complexity and volume of the internal circuitry significantly increase
Solution Approach 1:
The patent makes the AC electric machine's three-phase windings serve dual functions: driving the vehicle motor and acting as the inductive element for DC boost charging. By increasing the wire slots to at least 54, the windings have sufficient inductance to function as the energy storage element in the boost charging circuit, eliminating the need for a separate DC boost charging circuit and its associated inductive components.
Solution Approach 2:
The patent merges the function of the motor drive system with the DC boost charging system by using the same three-phase windings for both purposes. The windings serve as both the motor phase windings and the inductive energy storage element, combining two previously separate functions into one integrated system.
2Adaptability or versatility
If an additional inductive element is provided in the DC boost charging circuit, then the boost charging requirement is met, but the manufacturing cost increases
Solution Approach 1:
The three-phase windings are designed with sufficient inductance (achieved by having at least 54 wire slots) to serve dual purposes: motor operation and DC boost charging. This eliminates the need for additional inductive elements that would increase manufacturing cost, as the existing windings fulfill both functions.
3Adaptability or versatility
If the wire slots are increased to at least 54, then the inductance of the three-phase windings is sufficient for boost charging, but the electric machine structure becomes more complex
Solution Approach 1:
The patent changes the parameter of wire slot quantity to at least 54, which increases the inductance of the three-phase windings. This parameter change enables the windings to function as the inductive element for DC boost charging while maintaining a relatively simple structure by utilizing the existing stator slots rather than adding separate inductive components.
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 simplifies the circuit structure, reduces manufacturing costs, and enhances reliability and flexibility, enabling high-speed and high-torque operation while ensuring stable boost charging without additional components.
Implementation Method 1
three-phase windings in wire slots of an electric machine stator of the three-phase AC electric machine are used as an inductive energy storage element of a DC boost charging circuit
Data Source
AI summary
An electric machine control circuit, an electric drive assembly system and a vehicle. The electric machine control circuit includes a three-phase AC electric machine; a three-phase inverter, wherein, in an electric machine drive mode, the three-phase inverter is configured to receive DC power from an external power battery and output AC power for driving the three-phase AC electric machine. In a DC boost charging mode, three-phase windings in wire slots of an electric machine stator of the three-phase AC electric machine are used as an inductive energy storage element of a DC boost charging circuit, the inductive energy storage element and the three-phase inverter together forming the DC boost charging circuit, such that an external power supply module charges the external power battery by means of the DC boost charging circuit, wherein the wire slots are at least 54 wire slots.