High-speed motor test content and solutions
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. Therefore, the operation status and reliability monitoring of the power supply system It is very necessary.
