Position Control of PMSM using Frequency Division Multiplexing for Data Acquisition

Abstract

Many applications such as robotics require the angular position control of the motor shaft. Permanent magnet synchronous motor (PMSM) is suitable for the development of servomechanisms. On the other hand, frequency division multiplexing (FDM) allows simplifying the data acquisition system (DAQ) in vector control when a resolver sensor is used as angular position transducer. This paper shows the application of FDM and synchronous current sampling in the position control of PMSM. The resolver signals and the PWM carrier are synchronized to make easier the estimation of the fundamental component of the stator currents. Any multiplexing process produces an interference between the signals to be sent to the receiver. In the case of motor drive, the receiver is the motor drive DAQ. However, the tests performed in this paper show that the effect of that interference is negligible. Thus, FDM can be used in position control of PMSM.