Sensorless direct torque control of a permanent brushless AC drive via an extended Kalman filter.pdf

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SENSORLESS DIREXT TORQUE CONTROL OF A
PERMANENT BRUSHLESS AC DRIVE VIA AN
EXTENDED KALMAN FILTER
Y. Liu, Z. Q. Zhu, . Shi, D. Howe
Universty of Sheffield, .
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Keywords: Brushless motor, Direct torque control, Extended It results in excellent sensorless performance, without
Kalman filter, Permanent , Sensorless. introducing a phase delay. Further, it is easy to implement,
and requires putation, which potentially make it
Abstract more attractive than previous approaches.
The performance of an extended Kalman filter (EKF) based 2. DSP-based drive system
sensorless direct torque control technique for a PM brushless
AC drive is described pared with that which is The main elements of the DSP-based BLAC drive system are
obtained with other sensorless methods for estimating the the controller, the inverter and the PM brushless motor,
rotor speed and position from the stator flux-linkage. It is -3. The specification of the PM brushless motor is
shown that, since the EKF inherently has adaptive filtering given in Table 1, and the test rig is shown in . An
capability and does not introduce a phase delay, the technique encoder is used to measure the actual rotor position and to
provides better speed and position estimation. deduce the speed from the differential