In recent years, with the growth of the machinery and equipment manufacturing industry, the skill of frequency conversion speed regulation has grown rapidly. Frequency conversion speed regulation motors are commonly used in the operation of various machinery and equipment. Today, Wanbang Motor has compiled data and analyzed the high frequency operation of frequency conversion motors. The essentials of sound processing and punishment.

　　The whistling noise of the variable frequency speed control motor is probably because the output cable contains considerable high-order harmonic voltage and current, which makes the input voltage of the motor distorted, and the high-order harmonics of the stator and rotor electromotive force further increase. , The effect makes the phase electromotive force severely distorted, and the maximum value is much higher, causing serious fever of the motor coil, aging of the insulation and even breakdown.

　　Due to the additional torque generated by the high-order harmonic magnetic field generated by the high-order harmonics, the motor produces obvious vibration and severe noise.High-order harmonics greatly shorten the machine life and insulation life of the motor.

　　The whistling sound of the variable frequency motor in operation at this moment often gives people an illusion that it is caused by the frequency modulation of the inverter, but it is not necessarily.You should first confirm the origin of howling, and then deal with it.

　　In the first step, the inverter recycles the V/F control and runs the motor to the highest speed;

　　The second step, then manipulate the OFF2 of the inverter to free stop;

　　The third step is to identify that the motor speed drops along with the free stop process.

　　If the howling or vibration still exists, then there will be no work controlled by the frequency converter. It is a problem with the construction of the motor, and there is a resonance point in the operation of the machine transmission.Explain that it is a machine-manufacturing problem, not an electronic control problem.

　　If during the free stop process, the motor runs smoothly and there is no whistling, it is a problem of inverter control, which can be handled by adjusting the control parameters of the inverter.

　　One of the most important is to use the frequency converter as the dynamic and static mathematical model of the motor.If the mathematical model established by the inverter is accurate, the running quality will be good.To control the motor, its electromagnetic noise can be completely taken over.There is no doubt about this.