The heart of an electric vehicle is the motor, which provides the power source for the car. New energy vehicles have become the most promising type of automobile today, and this "surgery" will bring about a revolutionary change.
Below is the entire energy operation unit during the testing of the motor in a pure electric vehicle. The charging process when stationary is unidirectional: energy is transferred through the power grid – DC bus – battery. During operation: energy is transferred bidirectionally through the battery – DC bus – load motor. At this time, the electrical energy released from the battery via the DC bus is used to power the load. Simultaneously, when there is electrical feedback, energy is transferred back to the power grid via the DC bus, resulting in more efficient energy utilization.
The energy structure of a pure electric vehicle can be divided into four parts:
1. Battery charging system: The battery charging system converts the AC power from external charging piles, charging stations and other charging devices into DC power to charge the battery in the pure electric vehicle and store the electrical energy in the battery.
2. Motor drive system: The motor drive system is the core component of a pure electric vehicle, which converts the DC bus voltage output from the battery into AC power and uses the AC power to drive the motor.
3. DC voltage regulation system: Due to frequent charging and discharging, the voltage across the battery terminals fluctuates within a certain range. It is necessary to stabilize this voltage within a certain range to a stable DC bus voltage for direct application or other voltage conversion.
4. DC load power supply system: The main function of the DC load power supply system is to convert the stable high-voltage electricity output from the DC bus of the battery in the electric vehicle into a low-voltage output to power the low-voltage DC load in the vehicle.
Figure 2
Testing the motor—the heart of new energy vehicles—becomes particularly crucial, as it directly impacts the vehicle's operational status. Only motors that meet the relevant functional test requirements can handle such demanding tasks. For motor test benches, we typically perform TN curve analysis, no-load testing, stall testing, efficiency cloud mapping, regenerative energy feedback testing, maximum operating speed testing, overspeed testing, and temperature rise testing. The image below shows the efficiency cloud mapping test results, which allows us to identify the operating condition with the highest efficiency. This facilitates obtaining the motor's efficiency characteristics under any operating condition, assisting users in designing optimal motor control algorithms.
Figure 3
To meet the current needs of the motor industry, ZLG Zhiyuan Electronics has launched the MPT hybrid motor test and analysis system, pioneering a comprehensive test and analysis device for motors and drives, helping you solve testing problems for new energy electric vehicles.
