Experimental validation of an open loop drive control of an asynchronous motor with the TMS320F28379D DSP card and speed sensor

Abstract

• Implementation of real-time PWM signal generation and control using the TMS320F28379D DSP board. • Development and experimental validation of open-loop control for an asynchronous motor. • Integration of the industrial inverter module 7MBR75RA120 with interface and sensor boards. • Accurate speed measurement using an incremental encoder and the eQEP module. • Versatile platform for educational applications and closed-loop control implementations. This paper develops an experimental hardware and software implementation dedicated to variable speed training of a no-load asynchronous motor powered by a two-level three-phase inverter. The realized installation consists on, in addition off the 300 W wound-rotor asynchronous motor feed by the two-level 7MBR75RA120 inverter, an interface board that isolates and adapts the control PWM signals, a board for the motor’s voltage and current sensors with their power supplies, and an incremental encoder mounted on the same motor shaft. The open-loop control of the concerned installation is performed in real-time using the Texas Instruments TMS320F28379D development board, which communicates with the MATLAB/SIMULINK environment. The visualization of the motor speed is also done through direct and real-time communication between the encoder and MATLAB/SIMULINK. The inverter control is done with the PWM signals developed by the DSP card.