Rotor Position Alignment of FSTPI Based PMSM Drive Using Low Frequency Signal Injection

A PMSM drive with an incremental encoder or using sensorless control requires alignment to a predetermined rotor position (initial position) or initial rotor position detection at start-up. It is desired to lock the rotor to a known state (usually zero angle) at start-up if the initial rotor positio...

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Bibliographic Details
Published in:Applied sciences 2020-11, Vol.10 (21), p.7397
Main Authors: Ozturk, Salih Baris, Kivanc, Omer Cihan, Aksoz, Ahmet, Hegazy, Omar
Format: Article
Language:English
Subjects:
Current regulators
Electric potential
Floating point arithmetic
four-switch three-phase (FSTP) inverter
initial position alignment
Inverters
Locking
permanent magnet synchronous motor (PMSM)
Position sensing
reduced switch inverter
Rotors
Signal injection
Voltage
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Summary:A PMSM drive with an incremental encoder or using sensorless control requires alignment to a predetermined rotor position (initial position) or initial rotor position detection at start-up. It is desired to lock the rotor to a known state (usually zero angle) at start-up if the initial rotor position detection is not available or difficult to obtain. In this work, a simple and proper zero angle initial rotor position alignment of four-switch three-phase (FSTP) inverter-based PMSM drive is proposed. Low-frequency voltage signal is applied to the d-axis voltage reference of the open-loop FSTPI based PMSM drive scheme without requiring complex trigonometric calculations, PI current regulators and current sensing. Therefore, fluctuated capacitor voltages at the DC-link are obtained allowing current flown through phase a locking the rotor with zero angle, properly. The proposed method has been implemented using a low-cost FSTP voltage source inverter (VSI) for PMSM drive with a floating-point TMS320F28335 DSP. The effectiveness and the feasibility of the proposed zero angle initial rotor position alignment method for PMSM driven by FSTP inverter have been demonstrated through experimental results.
ISSN:2076-3417
2076-3417
DOI:10.3390/app10217397