Design Analysis of a High Speed Copper Rotor Induction Motor for a Traction Application

Abstract

This paper deals with the design of a 200kW, 20krpm machine for an electric vehicle application. The aim of the research is to design a low cost, rare-earth free magnet electric motor while ensuring mass production feasibility and providing higher performance than currently available technologies. Electromagnetic, thermal and mechanical constraints are considered throughout the machine design process, from the specification to the optimization. Rotor diecasting, oil spray cooling and hairpin winding are among the solutions investigated to fulfill the project requirements. Analytical and numerical methods are adopted for electromagnetic and continuous performance calculations over the machine's full speed range, taking into account the mechanical limits from a stress and modal point of view.

Simultaneous Estimation of Rotor Speed and Stator Resistance in Speed-Sensorless Vector Control of IMs

“…Fig. 2 shows the configuration of the adaptive flux observer (2) and the estimation ofω r andR s give by (3) and (4), respectively. In Fig.…”

“…In Fig. 2,ω r andR s obtained from (3) and (4) are treated as the actual values, and used in (2), which is called the CE principle (12) (13) .…”

“…Rare-earthfree induction motors (IMs) have been re-evaluated these days. Indeed, electric vehicles using IMs have been commercially produced (1) (2) . The speed-sensorless vector control has been used widely in industry applications to avoid system bloat, high cost, and low reliability.…”

Finite Elements Model Co-Simulation of an Induction Motor Drive for Traction Application

“…Key points of the design have been: 1) the cost reduction through the minimization of the motor size; 2) an optimized shape of the windings by hairpin technology, which permits to have a high efficiency (more than 94% considering WLTP class 3 drive cycle) due to lower losses and more efficient heat management although the AC winding losses due to high frequency skin and proximity effects, [14].…”

Performance Evaluation of an Induction Motor Drive for Traction Application

“…This article concerns an induction motor drive designed for traction of a Battery Electric Vehicle (BEV) equipped with a couple of 200 kW electric motors (Premium vehicles). The goal of the study is the performance evaluation accounting for the drive field-oriented control strategy, [15].…”