PMSM Drive Position Estimation: Contribution to the High-Frequency Injection Voltage Selection Issue
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Date
2017
Authors
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Journal ISSN
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Publisher
Université de M'sila
Abstract
High-frequency injection (HFI) is an alternative
method to estimate permanent magnet synchronous motor
(PMSM) rotor position using magnetic saliency. Once the maximum
fundamental electrical frequency and the power converter
switching frequency are set, the HFI voltage amplitude tuning is
generally based on trial and error. This paper proposes a methodology
to select the appropriate high-frequency signal injection voltage
amplitude for rotor position estimation. The technique is based
on an analytical model taking into account the noise in the voltage
supply to derive the resulting currents containing the information
on the rotor position. This model allows setting the injection
voltage amplitude that leads to the maximum acceptable position
error for a given signal-to-noise ratio and a speed range. The approach
is validated with the analytical and the global drive models
through extensive simulations. Experimental results on a 1-kW
PMSM drive confirm the interest of the proposed solution.
Description
Keywords
AC motor drives, Gaussian noise, permanent magnet synchronous motor (PMSM), rotor position estimation, signal-to-noise ratio (SNR).