Abstract
In electrolytic capacitorless permanent magnet synchronous motor (PMSM) drives, when the harmonic component of the position fluctuation is in a canceling relationship with the corresponding harmonic introduced by the DC-link voltage fluctuation, simply suppressing the position fluctuation aggravates the beat phenomenon. This article proposes a beat suppression strategy based on extended back electromotive force (EEMF) harmonic reconstruction. Small signal analysis reveals the impedance relationship between position compensation and beat current, quantitatively clarifying the nonlinear increment of beat currents. Specifically, multiple complex filtering is utilized to extract EEMF harmonics induced by DC-link voltage fluctuations. By feeding back the electrical angular frequency as the center frequency, the right sideband harmonic component is reconstructed for position estimation based on established current and EEMF frequency characteristics. Finally, the effectiveness of the proposed strategy is validated on an experimental platform, verifying beat suppression under various speed and torque conditions.
| Original language | English |
|---|---|
| Journal | IEEE Transactions on Transportation Electrification |
| DOIs | |
| State | Accepted/In press - 2026 |
| Externally published | Yes |
Keywords
- Electrolytic capacitorless drive
- beat suppression
- harmonic reconstruction
- permanent magnet synchronous motor
- position compensation
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