Comment on Preoperative prognostic nutritional index in prediction of surgical complications and oncological outcomes in retroperitoneal sarcoma

Bao, Yilu

doi:10.1007/s13304-026-02623-9

Design and Application of Speed Estimator for Synchronous Notch Filter Used in Automatic Balancing Control of Active Magnetic Bearing

2026-04-01

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PRE

AI

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Bui, Thien Vuong

Y

Yang, Jungsang

DOI：10.3795/KSME-A.2026.50.4.311

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Automatic balancing control is a technique to reduce synchronous control current due to mass unbalance using active magnetic bearings (AMBs). It uses a synchronous notch filter in addition to a levitation control, with the filter frequency equal to the rotor speed. An alternative to a separate speed sensor is to use a speed estimator utilizing the synchronous component in vibration signals. To overcome the complexity of previous efforts on speed estimation where two orthogonal vibration signals are needed, we proposed a simple estimator based on phase-locked loop (PLL) applied to a single vibration signal. The loop filter in PLL is designed to obtain the target performance of the estimation. The effects of spurious signals having the frequency twice of the input signal is also investigated. The speed estimator is implemented on a test rig, demonstrating an estimation accuracy of 96.5%. The synchronous notch filter using the estimated speed is added to the levitation control, resulting in more than 90% reduction in synchronous control currents.

Keywords:

Active Magnetic Bearing

Automatic Balancing Control

Synchronous Vibration Control

Phase-Locked Loop

Speed Estimation

Design and Application of Speed Estimator for Synchronous Notch Filter Used in Automatic Balancing Control of Active Magnetic Bearing

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