Motor Test Report 30 
Horsepower Single-Phase Written-Pole^®  Motor 
Page 4

Initial Field Trials
Additional field-testing is currently underway in Manitoba, Canada. The motor has been installed in a prototype harvesting system designed by Bob McLeod of McLeod Harvest Inc. The prototype will be used to power several fans in a yard plant used to handle and separate graft (a combination of grain and chaff) removed from the field with a special mobile threshing unit. Initial field trials have verified the motor's laboratory performance, handling loads of up to 135% of rated load for 5 hours with a temperature rise of approximately 60ºC. The motor's low starting current contributed to the motor's exceptional starting performance, limiting secondary voltage fluctuation under starting to 7 volts or 2.9% from a nominal voltage of 240 volts. 

Conclusion 
All tests to date have confirmed Precise Power Corporation's performance claims for the internal rotor design. Based on test results obtained during laboratory tests and early field trials it appears as though the prototype may be somewhat underrated. The motor operated flawlessly at up to 135% of its rating and exhibited peak efficiency at approximately 125% of rated load. Therefore, it would appear to be prudent to increase the rating of this design or allow for a service factor of at least 1.25. The optimal solution may be to increase the rating and modify the design to allow the starting current to rise proportionately, thereby increasing available starting torque.