| Abstract |
The paper presents a simple sensorless field
oriented control (FOC) for an induction motor drive. The
control algorithm is derived from the conventional FOC
equations by successive approximations. The control is of
the so-called V-type, that is, the references to the voltage
inverter are calculated, instead of derived as outputs of the
current regulation loops. The problem of the steady state
instability, which arises in V-type control, is analysed first,
then successful fixed by a proper filtering of stator current
measurements. The result is a precise, reliable and low-cost
induction motor drive. Implementation hints and
experimental results are included in the paper. |
