EV/HEV Inverter and motor drive system power detection analysis

Batteries, motors, and electronic control are the three core components of new energy vehicles. The motor drive control system is the main executive structure of new energy vehicles. Its driving characteristics determine the main performance indicators of the vehicle. It is an important part of electric vehicles. The motor drive system is mainly composed of a motor, a power converter, a controller, various detection sensors and a power supply. As one of the core components of new energy vehicles, driving motors of new energy vehicles have higher technical requirements than traditional industrial motors.

The test platform built by the high-precision current transducer AIT600, mechanical energy transducer and power analyzer can accurately measure and evaluate the electric vehicle drive system. The high-precision current transducer transmits the battery output signal, input and output signals of the inverter to the power analyzer, then builds the power measuring unit to perform accurate power measurement analysis. At the same time, the speed and torque transducers can measure the mechanical energy of the drive motor and build a motor measurement unit.

As shown in the figure, the battery pack of the electric vehicle provides DC power for the entire motor drive control system. The DC current enters the inverter and turn into three-phase AC power to supply the motor. The motor drives the bearing to rotate to realize the movement of the electric vehicle. The motor controller receives the motor speed and other signals and feedback to the instrument. When a braking or accelerating action occurs, the controller controls the frequency of the convertor to rise or fall to achieve the purpose of acceleration or deceleration. The No.1 high-precision current transducer measures the battery, voltage, current and other power parameters, the No. 2, 3, 4 high-precision current transducer measures the output power parameters of the invertor, the torque transducer measure the shaft power of the motor. The test system made of No. 1 and 2, 3, 4 is used to measure the efficiency of the inverter, the No. 2, 3, 4 transducers and the motor measurement system are used to measure the efficiency of the motor.

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