The heart of electric vehicles - the electric motor, which provides power for the car, has become the most promising car today, and there will be subversive changes through this "surgery."
Below is the entire energy operating unit for a pure electric vehicle to test the motor. Charging process at rest: energy is transmitted in one direction, through the grid - DC bus - battery; in motion: energy bidirectional transmission from the battery - DC bus - load motor. At this time, the power of the DC bus battery is released to provide work for the load, and at the same time, when the power is fed back, the energy is transmitted to the power grid through the DC bus, and the energy is utilized more efficiently.
figure 1
The pure electric vehicle energy structure can be divided into four parts:
1. Battery charging system: The battery charging system converts the alternating current in the charging device such as the charging pile and the charging station into direct current, and charges the battery in the pure electric vehicle, and stores the electric energy in the battery.
2. Motor drive system: The motor drive system is a pure electric vehicle that converts the DC bus voltage output from the battery into AC power and drives the motor with AC power, which is the core part of the electric car.
3. DC voltage regulator system: Because the voltage of the battery is often charged and discharged, the voltage at both ends is a voltage floating within a certain range. It is necessary to stabilize the voltage in this range to a stable DC bus voltage for direct Apply or do other voltage conversions.
4. DC load Power Supply system: The main function of the DC load power supply system is to convert the stable high-voltage power of the DC bus output from the battery in the electric vehicle into a low-voltage output, and supply power to the low-voltage DC load in the vehicle.
figure 2
The heart of the new energy vehicle - the test of the motor becomes more important, which is directly related to the running state of the car. Only the motor that meets the test of the relevant functional items can be qualified for such a task. For the motor test bench, we usually complete TN curve, no-load test, stall test, efficiency cloud map, regenerative energy feedback test motor test, electric maximum working speed test, electric overspeed test, temperature rise test and so on. The following figure shows the test results of the efficiency cloud diagram. It can find the matching of the working conditions with the highest efficiency, which is convenient for obtaining the efficiency characteristics of the motor under any working conditions and assisting the user in designing the optimal motor control algorithm.
image 3
ZLG Zhiyuan Electronic MPT Motor Test Platform In order to meet the needs of the current motor industry, the MPT hybrid motor test and analysis system was introduced, and the comprehensive test and analysis equipment for motors and drives was created to help you solve the test problems of new energy electric vehicles.
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