Table 1: Generator design data and measured values.

Parameter Design Experiment

Dimensions
 Axial length 197 mm 197 mm
 Stator outer diameter 1800 mm 1 800 mm
 Stator inner diameter 1635 mm 1 635 mm
 Air gap 7 mm 6.5–7.1 mm
  Number of poles 112 112
 Magnet thickness 10 mm 10 mm
 Magnet width 30 mm 30 mm
Nominal performance
 Speed 15 r.p.m. 15 r.p.m.
 Armature voltage 128 V 109.7 V
 Frequency 14 Hz 14 Hz
 Apparent power 7.5 kW 7.5 kW
 Power factor 1 1
in air gap 0.69 T 0.66–0.68 T
in tooth 1.74 T
 Nominal torque 5.6 kNm 5.93 kNm
 Efficiency 84.4% 80.5%
 Load angle 10°