Sensorless auto commissioning of the position phase shift compensation in permanent magnet machines

Abstract EN

An automated self commissioning procedures for sensorless controlled AC drives is described where no prior knowledge of the motor parameters is required.

The procedures includes the sensorless automatic calculation of the mechanical parameters of the motor drive passing through the sensorless automatic design of the sensorless speed controller and the mechanical observer and finally the sensorless automatic compensation of the error between the tracked saturation saliency position and the real rotor position in the permanent magnet machines due to the armature reaction based on a new technique depends on injecting a pulse of current in the d_axis, the change in the current in q_axis will depend on the error between the saturation saliency position and the real rotor position.

This change in Iq is fed back to an integral controller which will generate an angle to compensate the error in the estimated position.

This will increase the torque per volume of the PM machine and protect it from demagnetizing.

The paper is introducing experimental results to demonstrate the feasibility of this technique..