Special for frequency converter

The frequency converter (Variable Frequency Drive, VFD) is used to adjust the speed and torque of the motor and is widely used in the field of industrial automation. Choosing the right aluminum electrolytic capacitor is very important to the performance and life of the inverter. The following are some guidelines and recommend on the use of aluminum electrolytic capacitors in frequency converters:

Key parameters and characteristics

Capacitance and withstand voltage：

• capacitance: Select the appropriate capacitance according to the circuit design, usually ranging from hundreds of microfadas to thousands of microfadas.
• Withstand voltage value: Choose a capacitor whose withstand voltage value is 20-30% higher than the actual working voltage to ensure safety and life.

Low ESR (equivalent series resistance): Low ESR capacitors can reduce power loss, improve power efficiency, and better filter out high-frequency clutter.

High ripple current capability: The inverter needs to deal with large current fluctuations, and the capacitor with high ripple current capacity can withstand these fluctuations and improve the stability and reliability of the system.

Temperature stability: Choose capacitors with a wide temperature range (such as -40°C to 105°C or higher) to ensure stable operation in high temperature and harsh environments.

Long life and high reliability: The inverter requires the capacitor to have a long life (such as 5000 hours or longer) to ensure the long-term stable operation of the equipment.