Starting characteristics of permanent magnet and series excited motors powered by solar cells: Variation with solar radiation and temperature

The paper deals with the calculation of the starting current ratio and the starting torque ratio of the permanent magnet and series excited motor when powered by solar cells for two cases: With and without a maximum-power-point-tracker (MPPT). Defining a motor torque magnification by the ratio of the starting torque with an MPPT to the starting torque without an MPPT, one may get a magnification of 3 for the permanent magnet motor and magnification of 7 for the series excited motor. The study also shows that both motor types are less sensitive to solar radiation variation in systems including MPPT's as compared to systems without MPPT's. On the other hand, both motor types are more sensitive to temperature variation in systems including MPPT's.