Noor Aamir Baloch

• Doctor of Philosophy
• Yaskawa Electric

In this paper, the torque ripple of an induction motor due to dc injection for the stator resistance estimation is analyzed. In the analysis, the fundamental component of rotor flux is used for rotor flux orientation to avoid the perturbation issue in synchronous reference speed. On the synchronous reference frame, flux and torque fluctuation due t...

Back-EMF self-sensing is commonly used in induction machine (IM) drive systems, which can be effectively controlled using deadbeat-direct torque and flux control (DB-DTFC). Accurate machine parameters are needed for back-EMF self-sensing DB-DTFC drive systems. In this paper, an injection-based, real-time parameter estimation method for IM DB-DTFC d...

Back-EMF self-sensing is commonly used in induction machine (IM) drive systems for its maintenance cost and safety considerations. In recent years, compared to standard indirect field oriented control (IFOC), deadbeat-direct torque and flux control (DB-DTFC) has been shown to be a highly effective method for induction machine control with a fixed s...

In this paper, a design methodology and control algorithms of an interior permanent-magnet synchronous machines (IPMSM) for absolute position sensorless drive are proposed. In conventional research on absolute position sensorless control, initial motion of the rotor was inevitable, which was not preferred in many applications. In order to eliminate...

In this paper, two designs of Interior Permanent Magnet Synchronous Machine (IPMSM) for sensorless drive with absolute rotor position estimation capability are proposed. A conventional IPMSM design prepared for the same purpose had a demerit that for absolute position estimation, saying that the rotor should initially stroke for 100° in the worst c...

In this paper, a design and control method of Interior Permanent Magnet Synchronous Machines (IPMSMs), which is controlled in position sensorless mode based on high frequency signal injection, for absolute position detection and control capability has been addressed. Although conventional motor designs with symmetric structure work well in sensorle...

This paper presents new method for improving robustness of phase locked loop (PLL) used in encoderless control algorithm for estimating position and speed. The state based observer used as a PLL is modified by using sliding mode compensator. The sliding mode compensator is designed by using motor torque and PID compensator used in the state based o...