Question

Test 3-ENT 371 Electric Machines-Ch 7,8,9 Name: 04- Chapter 8 Synchronous Motors Referring to the V curves in Figure 8.13, the machine is at 50% load with a Unity Power Factor. Mark the operating point on the V-curve and estimate or determine: (a) The excitation voltage to maintain unity power factor is the machine is loaded to 50%? (b) If the load is increased to 100% and the field current is not changed, will the machine pull out of synchronism? synchronism? oad_ (c) if the load is increased to 150% and the field current is no changed, wil the machine pull out of d) The excitation voltage to maintain unity power factor frated lo dis ncreased to 100 % of rated (e) The excitation voltage to maintain unity power factor if the rated load is increased to 150% of rated load_ 60 r 140 100 80 60 40 20 300 FIGURE 8.13 Family of representative V curves for a synchronous moto

Answer 1

td lo 30 so i (he The excitation voríaje Co mainfain too 30v a 130v and oin oin wil Olcmain Jalme