Abstract
The traction in Electric Vehicles (EVs) does not only require less torque ripple contents, high ratio torque/mass, high efficiency and good overload performance under the limited battery capacity condition, but it also requires very good dynamic response under different driving cycles. In this paper, the comparison of transient behavior and dynamic responses between a three-phase Synchronous Reluctance Motor (SynRM) with brass rotor bars and a conventional squirrel cage three-phase induction motor (SCIM) is presented, having identical NEMA frame stators. Both machines are 4-pole, 5.5 kW with a base synchronous speed of 1500 rpm. The practical tests are performed in order to analyze the transient characteristics and dynamic responses when there is a sudden change in mechanical load. Although the results evidenced that at standstill, the SynRM with brass rotor bars developed an induction torque with peak-to-peak values slightly lower than the squirrel cage induction motor, but the reluctance torque of the SynRM with brass bars cage has been noticed to have a cumulating effect on the accelerating torque. Furthermore, the results also proved that SynRM with brass rotor has shorter time dynamic responses and low steady-state no-load and load current compared to the SCIM.