Motor Phase Charging with Magnetic Field Compensation
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Solution Overview
Problem
Existing power supply and charging systems for electric vehicles face issues with oversized power connectors and magnetic field disturbances during battery charging, leading to rotor movement and safety concerns.
Innovation Solution
A method and device that switch between motor supply and battery charging modes using integrated switching means with H-bridges, and compensate magnetic fields by injecting compensation currents or using diode bridges to rectify the network, ensuring the rotor remains stationary during charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power connectors are used to ensure the passage of currents during battery charging, then the current conduction capability is improved, but the connector size must be oversized
Solution Approach 1:
The patent combines the battery charging function with the motor phases, using the motor phases as inductors during charging. This eliminates the need for separate power connectors and their associated switching means, as the motor phases themselves perform the current conduction function during battery charging mode.
2Device complexity
If the motor phases are used as inductors to rectify the network current during battery charging, then the device complexity is reduced, but magnetic field disturbances occur causing rotor movement
Solution Approach 1:
The patent applies preliminary anti-action by injecting compensation currents into the motor phases before or during the charging process. These compensation currents are specifically designed to counteract the magnetic fields generated by the rectified network current, thereby preventing rotor movement and vibrations before they can occur.
Solution Approach 2:
The patent converts the harmful magnetic field effect into a beneficial control mechanism. By intentionally injecting compensation currents, the system uses the same magnetic field mechanism that causes rotor movement to instead create counteracting fields that stabilize the rotor, transforming a harmful effect into a useful control function.
3Adaptability or versatility
If switching means with power contactors are used to switch between motor supply and battery charging modes, then the mode transition capability is improved, but the device complexity and safety risks increase
Solution Approach 1:
The patent makes the motor phases universal by enabling them to serve dual functions: acting as motor windings during motor supply mode and as inductors during battery charging mode. This multi-functionality eliminates the need for separate switching means and power contactors, simplifying the device while maintaining full mode transition capability through control of the inverter.
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 effectively limits or eliminates rotor movement, enhancing safety and comfort by optimizing the use of motor phases as inductors and reducing inductance, thus addressing the drawbacks of existing systems.
Implementation Method 1
a compensation step during said step for charging the accumulation means on the electrical network, characterized in that it comprises an operation consisting in injecting, into the phases of the motor which are not connected to a phase of the network, a compensation current
Implementation Method 2
The passage from the motor supply mode to that of the battery charge is ensured by switching means with power contactors by disconnecting the neutral
Implementation Method 3
an operation consisting in rectifying the electrical network by means of a diode bridge
Data Source
Figure 1
Figure 2A~2B
Figure 3~4
AI summary
The invention relates to a combined device and method for powering and charging, that comprises an AC motor (6), a converter (2), storage means (5), and switching means (4) either for enabling the powering of the motor (6) or for enabling the charging of the storage means (5) by the converter. The device includes means for compensating the magnetic fields generated during the charge of the storage means (5) in order to limit or prevent the movements of the motor (6) rotor.