Online Inductance Identification for Sensorless Control of PMSM
- Online Inductance Identification for Sensorless Control of PMSM
- Date Issued
- In the permanent magnet synchronous motor (PMSM), the inductances,
especially the q-axis inductance, vary depending on the current due to the local
core saturation. Accurate motor parameter values, including inductances,
are a vital factor for an accurate angle estimation in the speed sensorless control.
In this work, an on-line inductance estimator is constructed together
with a sensorless algorithm. An interior permanent magnet synchronous motor
(IPMSM) model is described in a misaligned coordinate frame, to which
the gradient algorithm is applied for an identification law. The parameter
identifier is linked with the sensorless algorithm exchanging angle error and
inductance information. Simulation and experimental results demonstrate the
effectiveness of the proposed method.
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