Performance Calculations (Electric Motors)

4.7.1
Calculation of motor performance for this motor is done in a fashion similar to that for the series motor discussed earlier in this topic. All of the slot areas, magnetic paths, and other geometric properties are virtually identical to those of the series motor. The flux and mmf drops for this motor must be calculated at each desired speed or load point. This is necessary because the series winding causes the total field flux to change as the load current changes. The changes for the cumulative connection are not as dramatic as those of the series motor because the shunt field adds a constant component of flux. The flux change for the differential connection can, however, be very dramatic.