The frequency converter is an essential companion product for the permanent magnet direct-drive electric drum, and its selection is crucial. The performance characteristics of the frequency converter directly impact the performance and lifespan of the permanent magnet electric drum. Comparative tests have shown that three-level frequency converters outperform two-level frequency converters in several areas, including reducing output harmonic content, improving converter efficiency, extending motor lifespan, and enhancing system stability.

Features:

1. Three-Level Topology:

   • The converter uses a three-level topology structure, enabling each phase to output three voltage levels. This results in an output waveform closer to a sine wave, reducing waveform distortion and harmonics.

2. Low Voltage Change Rate (du/dt):

   • The lower voltage change rate minimizes stress on motor insulation, thereby ensuring the longevity of the insulation.

3. Extended Motor Lifespan:

   • The reduced stress and harmonic content contribute to extending the motor's operational life.

4. High Stability and Reliability:

   • The IGBT power module withstands a working voltage equal to half of the DC bus voltage, enhancing the stability and reliability of the system.

5. Lower Losses and Heat Generation:

   • Compared to two-level frequency converters, the three-level version has lower losses and generates 40-50% less heat, leading to higher system efficiency.