occupy? Braking is processed in the second quadrant. There is no braking in the first quadrant. The high braking torque is the braking benefit hence the high current is its drawback because of heating danger. Test VI If the rotor resistance rises, which slip will increase in the wound rotor motor? breakdown, operating If the rotor resistance reduces, which speed will increase in the wound rotor motor? operating What is the rheostat characteristic of the wound rotor motor? softer than natural How does the rheostat starting affect the run-up current? reduces How does the rheostat starting affect the run-up rate? reduces How does the rheostat starting affect the run-up torque? increases or decreases If the load torque of the synchronous motor increases, what does the rotor current do? does not change If the load angle of the synchronous motor increases, what does the torque do? increases or decreases
+ A VS RV V D - Fig. 1.1. Circuit diagram VS - DC voltage source PS 5005, 0-50VDC/0-5A RV - Rheostat, Rmax=3600 V - DC volt meter DV-101, 200mV-200V A - DC current meter DA-103, 2mA-20mA-200mA-5A D - Diode 1N360 Voltage divider calculations RV=(US-UAC)/If(max) RV=(46,6 - 0,45)/0,1=461,5 Table 1.1. Observed data If , mA US If Uf Ir Ur 0,60 - 1,1 3 0 4,9 0,67 - 5,1 2 0 10 0,70 - 10 8 0 15,1 0,74
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