Cause electromagnetic noise and vibration problems
When the ordinary asynchronous motor is powered by the inverter, the vibration and noise problems caused by electromagnetic, mechanical, ventilation and other factors will be more complicated. Each time harmonic in the variable frequency power supply interferes with the inherent spatial harmonics of the electromagnetic part of the motor to form various electromagnetic exciting forces. When the electromagnetic wave frequency is consistent or close to the natural vibration frequency of the motor body, a resonance phenomenon will occur, and severe electromagnetic high-frequency noise will occur with a certain degree of vibration.
Structural fatigue and insulation aging
Powered by the inverter, the motor can be started in a low frequency and voltage with no inrush current, and can be quickly braked by various braking methods provided by the inverter, creating a frequent start and brake. Conditions, but the mechanical system and electromagnetic system of the motor are under the action of cyclic alternating force, which brings fatigue and accelerated aging problems to the mechanical structure and the insulation structure.
The application of high-performance inverters has revolutionized the motor industry. Most motor test equipment replaces regulators and inverter units with statically adjustable variable frequency power supplies. However, most of the terminal customers supply power frequency, which will inevitably bring a hidden danger that can not be ignored: the motor can run normally when the static adjustable variable frequency power supply is supplied, and the power frequency power supply may not start normally. Ms. Shen's friend Xiao C has this experience: a multi-speed motor, static adjustable variable frequency power supply test (frequency conversion start), everything is normal, the customer power frequency power supply can not start at a certain speed. Therefore, the application of the variable frequency motor that simulates the actual working condition of the power supply test to the traditional power frequency power supply application may also have fatal defects.
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