Starting characteristics of direct current motors powered by solar cells

Technical Report · Wed Mar 01 00:00:00 EST 1989

OSTI ID:5845611

Singer, S; Appelbaum, J

Direct current motors are used in photovoltaic systems. Important characteristics of electric motors are the starting to rated current and torque ratios. These ratios are dictated by the size of the solar cell array and are different for the various dc motor types. Discussed here is the calculation of the starting to rated current ratio and starting to rated torque ratio of the permanent magnet, and series and shunt excited motors when powered by solar cells for two cases: with and without a maximum-power-point-tracker (MPPT) included in the system. Comparing these two cases, one gets a torque magnification of about 3 for the permanent magnet motor and about 7 for other motor types. The calculation of the torques may assist the PV system designer to determine whether or not to include an MPPT in the system.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
• OSTI ID: 5845611
• Report Number(s): N-89-19493; NASA-TM-101981; E-4550-1; NAS-1.15:101981
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
ELECTRIC MOTORS
TORQUE
PHOTOVOLTAIC POWER SUPPLIES
DIRECT CURRENT
PERMANENT MAGNETS
CURRENTS
ELECTRIC CURRENTS
ELECTRONIC EQUIPMENT
EQUIPMENT
MAGNETS
MOTORS
POWER SUPPLIES
SOLAR EQUIPMENT
140600* - Solar Energy- Photovoltaic Power Systems