High-speed motor power supply system monitoring test program
High-speed variable frequency motor refers to the speed exceeding 10000r/min, generally tens of thousands of revolutions or even hundreds of thousands of revolutions. It has broad application prospects in electric vehicles and distributed generation systems. In the case of high speed and ultra high speed operation, the running characteristics of the motor are very different from those of conventional motors. It is crucial to test the high speed motor.
High-speed variable frequency motor refers to the speed exceeding 10000r/min, generally tens of thousands of revolutions or even hundreds of thousands of revolutions. The motor input fundamental frequency range is 1000Hz or higher, and the number of poles is basically 2 levels. High-speed motors have significant advantages such as high speed, relatively small size, high power density and high efficiency. They are used in many applications such as centrifugal compressors, energy storage flywheels, textiles, high-speed grinders, etc. in electric vehicles and distribution. The power generation system has broad application prospects. In the case of high speed and ultra high speed operation, the running characteristics of the motor are very different from those of conventional motors. It is crucial to test the high speed motor.
High-speed motor test content
1, high speed motor efficiency test
High-speed motors have high power density, but the losses per unit volume are also large, especially the rotor's wind wear loss and eddy current loss are dozens of times that of general motors. The efficiency of the high-speed motor is obtained by the input power measurement of the motor (including voltage, current, power, power factor, etc.), output measurement (speed, torque, power, etc.), excitation measurement, and the like. The high-speed motor efficiency test is used to analyze the loss associated with high-speed motors. It is the key to the structural design of high-speed motors, improving mechanical characteristics, improving heat dissipation, and reducing losses.
2. High-speed motor power supply system monitoring
High-speed motors are generally powered by frequency converters and are sensitive to the fundamental frequency and harmonic components of the power supply system. The voltage waveform outputted by the inverter is a PWM wave. In addition to the fundamental wave, it also contains a large number of high-order harmonics of integer multiple carrier frequency, which will bring high-frequency additional loss to the high-speed motor, so the monitoring status and reliability of the power supply system are monitored. It is very necessary.
Key requirements for high speed motor testing:
1. In order to accurately obtain the efficiency of the motor, it must be ensured that the motor input electric power and the motor output shaft power are strictly measured synchronously.
2. It must meet the measurement needs of the fundamental wave voltage, fundamental frequency, harmonic analysis, etc. of the inverter output PWM wave.
3. The test system consisting of sensors and test instruments must have an overall accuracy of 0.2.
4. Since the power factor of the high-speed motor is less than 0.2 during the no-load test, the angular difference index of the test system must meet the requirements of power measurement accuracy under low power factor conditions.
5, high-speed motor test site general electromagnetic environment is complex, the test system must have strong anti-electromagnetic interference capability.
High speed motor test solution
The test system adopts PA8000 power analyzer developed by Guangzhou Zhiyuan Electronics. Zhiyuan PA series power analyzer can perform measurement of up to 6 power inputs. By measuring the electric power and mechanical power of the input and output of the inverter, the efficiency of the inverter can be accurately evaluated. The conversion power between the electrical energy of the drive system and the machine. At the same time, through detailed spectrum analysis and dynamic torque calculation, the PA power analyzer can accurately measure the switching loss caused by the inverter, and can fully evaluate the torque transients and harmonics at high frequencies.
