What are the causes of power inverter vibration problems

As the core component of modern power electronic systems, power inverters are responsible for converting direct current into alternating current, ensuring that all types of loads have a stable and reliable power supply. However, in practical applications, inverters often face vibration problems, which not only affect their normal operation, but may also shorten their service life and even cause safety hazards.
When discussing the causes of inverter vibration, we can analyze from multiple angles, mainly including electromagnetic factors, mechanical factors, electrical factors and environmental factors.
Electromagnetic factors
Electromagnetic force is one of the main causes of inverter vibration. The inverter integrates a variety of electromagnetic components, such as inductors, transformers and power switching devices. During operation, these components will generate a changing magnetic field, which will in turn induce the effect of electromagnetic force. When the electromagnetic force is unbalanced or too large, the inverter will vibrate. In addition, electromagnetic interference (EMI) may also cause abnormal inverter control signals, further exacerbating the vibration problem. Therefore, when designing the inverter, it is necessary to fully consider electromagnetic compatibility (EMC) and reasonable layout to reduce the impact of electromagnetic interference.
Mechanical factors
The mechanical structure design, manufacturing and installation quality inside the inverter have a direct impact on its vibration performance. For example, the vibration and noise generated by the cooling fan, heat sink and other components during operation may be aggravated by unreasonable design or loose installation. In addition, mechanical failures such as loosening of fasteners such as screws and nuts inside the inverter and wear of bearings will cause vibration problems of the equipment. Therefore, precise mechanical design and strict manufacturing standards are the key to ensure the stable operation of the inverter.
Electrical factors
Electrical factors are also an important cause of inverter vibration problems. The stability of the inverter input power supply and the balance of the three-phase voltage are directly related to the stability of its operation. If the input power supply is unstable or the voltage is unbalanced, the operating state of the inverter will be affected, causing vibration. In addition, the noise generated by the power switching devices (such as insulated gate bipolar transistors, IGBTs) inside the inverter during high-frequency switching may be transmitted to the inverter housing through the circuit, causing vibration. Therefore, optimizing the electrical design and ensuring the quality of the power supply are important measures to reduce vibration.
Environmental factors
Environmental factors should not be ignored for the vibration problem of the inverter. If the working environment temperature of the inverter is too high or too low, the performance of the internal components may be degraded, thus causing vibration. In addition, vibration sources in the external environment, such as mechanical equipment and vehicles, may also exert external excitation on the inverter, further aggravating its vibration. Therefore, in the application scenario of the inverter, a reasonable selection of the installation location and environmental conditions can effectively reduce the impact of external vibration on the equipment.