SENSORLESS CONTROL OF INTERIOR PERMANENTMAGNET SYNCHRONOUS MOTOR BASED ON EXTENDED KALMAN FILTER
Journal Title: ANALELE UNIVERSITATII DIN CRAIOVA - Seria Inginerie electrica - Year 2010, Vol 34, Issue 34
Abstract
This paper presents a sensorless position control concept for an interior permanent magnet synchronous motor (IPMSM). Conventionally the speed of an IPMSM can be measured conveniently by d.c. tachogenerators, which are nowadays brushless d.c. tachogenerators. Rotor position can be also measured by using electromagnetic resolvers or digitally by using incremental or absolute encoders. Furthermore, an electromechanical sensor increases the system inertia, which is undesirable in high-performance drives. It also increases the maintenance requirements. In very small motors it is impossible to use electromechanical sensor. In a low-power torque-controlled drive the cost of such a sensor can be almost equal to the other costs. In drives operating in hostile environments, or in highspeed drives, speed sensors cannot be mounted. For motor spinning condition it allows estimation of rotor velocity and position of an IPMSM drive using a simple Kalman filter algorithm (EKF) with stator voltages and currents measurements. This model is more complex than the one in surface-magnet synchronous motors due to magnetic circuit asymmetry. Along with the extended Kalman filter, are presented the realized filter loop, the filter block and filter algorithm. Next, are presented the experimental results for motor starting and steady-state no-load and full-load condition in order to validate the EKF’s capability to correctly estimate the system states while providing the feedback quantities to the velocity and position controllers.
Authors and Affiliations
Laurenţiu-Ionel DIACONU
Keywords
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