The performance of dc motors (series, I
separately-excited, and shunt motors) powered by a 0Y°K)l
solar cell generator and loaded by two different types 000 u
of loads, one a constant load and one a ventilator
load, were analyzed with respect to the transient 000
(starting) and steady state operation. Direct current Solar cell
motors are employed in photovoltaic water pumping generator
systems; therefore, the understanding of the system
operation and the matching of the system components Fig. 1. Schematics of the solar cell system
(solar cells, dc motor type, and load type) are
important factors of the system design. Since the 1 4 / _-;9 1
solar cell generator in a nonlinear and time-dependent t ma,
power supply with an output that varies with the 80%
insolation (hourly and daily), the performance l-/
characteristics of the dc motor are different when 0 ,L
supplied by a solar cell generator than when supplied a 60%* i
0 8 ~~~~~~~0~~800 by a conventional constant voltage source. The o 8,
transient solution was obtained by using an available /
computer program - SUPER SCEPTRE. The separately - 6-4X / 60
excited (or permanent magnet) motor with a ventilator , lo , 400
load was found to be the most suitable for the solar 4 -4
cell generator. The series motor is quite acceptable, 20% '
but the shunt motor gives poor performance. In all 2 2_00-
cases the ventilator load is more compatible with the 2_-0% lo
0 9 solar cell generator than with the constant load.