FLOWX Engineer 86-21-54150349
The electric actuator current is measured and calculated by using the magnetic flux density which is directly related to the data collected by hall sensors in the air gaps. The density distribution in will be considered constant in each electric actuator for both the flat and the curved pole surfaces due to the similarity of the force transducers.
Estimation can be made by using the current method to show a significant deviation of the electric or pneumatic actuators builders to the reference values, which is especially true when they are compared at the maximum current for an air gap with the electric actuator estimation error of less than twenty percent. In almost all cases, the electric actuator estimation error is very small and not useful for a precise force measurement of the electric actuator that is needed for modal analysis. The large error supposable might occur due to the neglect of the electric actuator shaft as and with large currents, the saturation of the electric actuator builders material might occur so as to compensate the effect slightly. The compensation effect also depends on many electric actuator builders parameters and it will promise to lead to robust force estimation by using the current air gap method with the accuracies rats of more than thirty percent as achievable.
It has been proven that much more promising are the results for the electric actuators force estimation without any doubt with applied hall sensors since the achieved quality seems to be rather good compared to changes of the air gap at a range of current levels with different saturation effects in the flat pole surfaces. On the other hand, the electric actuator force that is estimated by the measured flux density is much higher than the achieved value even if only one hall sensor is applied in the center, the maximum value can be sensed in the air gap while the electric actuator flux density in spite of the fact that the local force will decrease towards the edges inside the electric actuator.
As a matter of fact, although the electric actuator builders promise a good quality of the current method, different effects might occur at the same time so that deeper investigation concerning the electric actuator is still needed to fully understand the exact influence of each electric actuator parameter. To conclude, the electric actuator devices that have been developed so far can be divided into two categories including those generated by a single actuation that can be controlled very precisely by a sequence of actuation pulses. Still, these electric actuator devices normally operate only at low frequencies, which is why more flexible models need to be used in parallel in the continuous mode.