Open AccessImplementation of sensorless DC‐link capacitorless inverter‐based interior permanent magnet synchronous motor drive via measuring switching‐state current ripples
Author(s) -
Chen Yi,
Liu TianHua,
Cuong Nguyen Manh
Publication year - 2016
Publication title -
iet electric power applications
Language(s) - English
Resource type - Journals
ISSN - 1751-8679
DOI - 10.1049/iet-epa.2015.0303
Subject(s) - control theory (sociology) , rotor (electric) , inverter , ripple , duty cycle , pulse width modulation , voltage , torque ripple , engineering , computer science , electrical engineering , direct torque control , induction motor , control (management) , artificial intelligence
This study proposes a sensorless speed‐control system for a DC‐link capacitorless inverter‐based interior permanent magnet synchronous motor (IPMSM) drive system via measuring switching‐state current‐ripples. By measuring the current‐ripple of each pulse‐width modulation switching‐state, the rotor position of the IPMSM can be estimated. As a result, the hardware of a high‐frequency sinusoidal voltage or current source is not required. In addition, by suitably selecting the different levels of the fictitious DC‐link voltage and compensating the duty cycle of the switching interval, the estimated rotor position error can be effectively reduced to nearly 50%. A 32‐bit digital signal processor, TMS‐320LF‐2407A, is used to execute the rotor position estimation algorithm and the speed‐controller. Experimental results validate the theoretical analysis. The proposed sensorless IPMSM drive can be operated from 3 to 2000 r/min. This study proposes a method to implement a DC‐link capacitorless inverter IPMSM drive system and improve its performance without injecting any high‐frequency voltage or current.