Integrated Motor Transformer for EV Charging and Drive Sharing
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Solution Overview
Problem
The existing architecture of new energy vehicles with separate on-board chargers and electric drive systems results in complex systems, low device utilization, and wasted vehicle space due to time-sharing operation.
Innovation Solution
Integration of a motor with a transformer structure that includes a primary and secondary coil wound around the stator core, allowing for voltage transformation and simultaneous charging and driving, sharing a cooling and heat dissipation system, and utilizing a motor control unit for alternating current-direct current conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate on-board charger and electric drive system are used, then charging function is achieved, but device utilization is low and vehicle space is wasted
Solution Approach 1:
The patent combines the on-board charger and electric drive system into a single integrated motor system. The motor includes both a drive winding for motor operation and a transformer winding for charging operation, both wound on the same stator core. This merging eliminates the need for separate charging equipment, improving device utilization and reducing vehicle space occupation.
Solution Approach 2:
The motor is designed to perform multiple functions: it can operate as an electric motor during vehicle movement and as a charger during vehicle stationary periods. The stator core serves dual purposes by accommodating both drive windings and transformer windings, allowing the same hardware to fulfill both driving and charging requirements, thereby achieving multi-functionality.
2Adaptability or versatility
If separate on-board charger and electric drive system are used, then charging function is achieved, but system complexity increases
Solution Approach 1:
The patent merges the charging system and drive system into one integrated motor structure. The stator core contains both transformer windings (for charging) and drive windings (for motor operation), eliminating the need for separate charging equipment, rectifiers, and control systems. This single integrated structure significantly reduces system complexity compared to having two independent systems.
3Volume of moving object
If transformer is integrated in motor, then vehicle space is saved, but current density must be improved
Solution Approach 1:
The transformer is integrated within the motor stator, with the transformer winding sharing the same magnetic core as the drive winding. This integration eliminates the need for a separate transformer housing and mounting space, significantly reducing overall volume. The compact integrated design naturally improves current density by concentrating the windings in a smaller space with optimized magnetic path.
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 integration improves device utilization, reduces transformer volume, saves vehicle space, and enhances current density by enabling both charging and driving with a single system.
Implementation Method 1
the primary coil and the secondary coil are wound around a yoke part of the stator core, to form a transformer, to step up/step down a voltage output by the external power supply
Implementation Method 2
the alternating current output by the transformer is converted into a direct current through the MCU, to charge the power battery
Implementation Method 3
a stator magnetic field and a rotor magnetic field generate an interaction force through control of the MCU coupled with the motor, to drive the rotor to rotate
Data Source
AI summary
A motor, a charging apparatus and a powertrain. The motor of the charging apparatus includes a rotor, a stator, a primary coil, and a secondary coil. The stator includes a stator core. The primary coil is wound around a yoke part of the stator core, and the primary coil is coupled to an external power supply. The secondary coil is wound around the yoke part of the stator core, and the secondary coil and the primary coil are wound around different groove structures inside the stator core. The primary coil and the secondary coil implement coupling voltage transformation through the stator core, to step up or step down an output voltage of the external power supply.