Torque Estimation in High-Efficency IPM Synchronous Motor Drives

Abstract

In modern electrical drives, the energy saving starts with the careful generation of the electromagnetic torque, which involves the electrical motor and its current control. A modern choice is represented by an anisotropic synchronous permanent magnet (IPM) motor combined with the maximum torque per ampere (MTPA) control technique. The MTPA locus brings along additional information that is worth deepening. In particular, this paper shows that a proper rearrangement of the torque expression in MTPA condition, merged with a simple leastsquare\ud algorithm, returns an accurate on-line estimation of the electromagnetic torque. The effectiveness of the proposed method is proved by a worked out example, based on a IPM drive model fitted with finite-element analysis and experimental measurements, including motor saturation effects. The torque estimator extends its usability in the whole working region of the drive, even during transients outside the MTPA curve, and it comes almost for free. In this, the proposed method should be technically sound in many industrial applications

A Torque Control Method Based on I-MR Controller for IPMSM Drive With Small DC-Link Capacitor

“…Nowadays, interior permanent magnet synchronous motors (IPMSMs) have been widely used in industrial and white home applications due to their superior efficiency, power density and torque-to-inertia ratio [1]- [3]. Generally, in traditional AC-DC-AC IPMSM drive systems, large capacity electrolytic capacitors are utilized at dc-link to buffer energy and stabilize the voltage.…”

Direct controls for wind turbine with PMSG used on the real wind profile of Essaouira-Morocco city

“…Energy conversion chains associated with wind power often use a permanent magnet synchronous generator (PMSG) due to self-excitation, which allows operation with high power factor and high efficiency [1]. Indeed the synchronous machine is characterized by high volume torque as well as a low inertia and inductance [2], which gives it high performance compared to the asynchronous generator, a high efficiency and better controllability [3]. However the control of this machine remains complex because of the decoupling between the electromagnetic torque and flux.…”

Experimental Study for the Assessment of the Measurement Uncertainty Associated with Electric Powertrain Efficiency Using the Back-to-Back Direct Method

“…IEC 60034-30-2 addresses the standardization of efficiency tests of motors with up to eight poles for industrial purposes, and it cannot be applied to permanent magnet motors for small-vehicle traction, which are characterized by high numbers of poles and variable-speed operation. To date, rigorous estimations of the efficiencies of permanent magnet synchronous motors have not been investigated extensively [11][12][13][14][15][16][17], because most studies have been focused on induction motors, which are mostly used in industrial applications. Then, a 48/12 V converter and a small battery storage system are added.…”