Abstract
Electric motors are widely used in the agricultural industry, yet many researcher and students in Egypt need to understand their basic operating characteristics. Designed laboratory activities can provide an accepted method for students under Egyptian conditions to observe and actively study motor operation. However, commercially available electric motor test are prohibitively expensive for many agricultural systems of technology at the University level. The aim of the current study was to develop the construction and evaluationof an inexpensive unit test for electric motor that allows students to actively study the power output, efficiency, and power factor of small, fractional horsepower AC and DC electric motors. Prony brake laboratory unit test may be easy to measure and determine the power efficiency and power factor for AC motors. The power efficiency was 91% for N3-70 AC motor comparing with 87.3% , 83.7 % and 70.3 % for DC motor KAG, DC motor MNB and AC motor turbo respectively.
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