Recent Developments of Electrical Drives - Part 33. The book stating the recent developments of electrical drives, can be useful for engineers and researchers investigating and designing electrical and electronic devices as well as for students and young researchers dealing with electrical and electronic engineering, computer sciences (advanced computer modelling, sophisticated control systems with artificial intelligence tools applied, optimal design bye use of classical and genetic algorithms employed), applied mathematics and all the topics where electromagnetic, thermal, mechanical phenomena occur | 318 Di Gerlando et al. Figure 15. Simulated and test results of the motor of Table 2 and Fig. 4 withNtac 46 in sinusoidal feeding 380 Vrms 50 Hz x axis torque from no-load to Tmax y axis input current V analytical simulation by 15 16 80 8 8max z V experimental result x FEM simulation result 14 . Another important effect connected to the PM winding arrangements adopted in this kind of machine is the very low level of cogging by manually handling the rotor of the unfed motor we have verified no appreciable cogging torque as confirmed also by FEM simulations 14 . Fig. 15 shows simulated and test results of the input current in loaded operation with sinusoidal feeding V 380 Vrms f 50 Hz with the torque ranging from zero to Tmax the analytical result see also Fig. 7 is confirmed both by measurements and FEM simulation for no-load rated torque and pull-out torque conditions. The rated operation has been verified also by a thermal test Fig. 16 that indicated acceptable temperature levels. Figs. 17 and 18 report some simulations performed by integrating equation 28 aimed to show the motor dynamic behavior evidencing its self-starting capabilities under mains sinusoidal supply in loaded conditions. Considering that the rotor inertia equals Jr kgm2 we have considered to drive a load with the same inertia Jtot kgm2 several simulations have been performed with different mains voltage phase conditions. Figure 16. Experimental thermal test of the motor of Table 2 Fig. 4 Ntuc 46 running with sinusoidal feeding 380 Vrms 50 Hz with rated torque Tn 53 Nm the points are the temperatures measuredbyathermocoupleputincontactwiththeendwindings ambienttemperature Ta C . 319 . High Pole Number PM Synchronous Motor Figure 17. Simulated transient of the motor of Table 2 Fig. 4 Ntac 46 with sinusoidal feeding V 380 Vrms f 50 Hz synchronization from zero speed with rated torque Tn 53 Nm total inertia kgm2 response to torque steps of DT 40 Nm. Fig. 17 refers to a .
