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Like the weather, over the years, motors have been a major topic of conversation; but very little has been done about them. All too often "experts" have espoused their favorite theories, based on thin air and secondhand hearsay. Good motors have been unnecessarily discarded and replaced with inferior ones, based on the latest hype or fad. They have been blamed for problems which were caused by inadequate power supplies, poor power trains and mismatches thereto. At present no type of motor is the panacea for solving all problems or even a large percentage of them. In various applications, each has its advantages and disadvantages, which must be evaluated for optimum use. To achieve this, a good understanding of motor functions and properties is necessary before REMOTORING. The major problem has always been a lack of reliable unbiased data upon which to judge. Over the years, only Pittman and NWSL have presented actual ANALYTICAL GRAPHS with the required data. Most manufacturers of commercial motors, that provide them, present idealized curves based on noload speed, stall torque and currents. These can yield ballpark results. Too often ratings are at the maximum efficiency point, which may be meaningless for comparison and out of perspective. Frequently the maximum power is quoted, but this is at a different point beyond the previous and might be out of usage range for loco operation. Comparison is like that of apples and oranges. For useful selection, more data is sorely needed. To this end, a dynamometer is in development stages. It will measure stall torque with current, noload RPM with current and hopefully, running RPM and current with known absorption friction torque applied to motor shaft. Actual power and efficiency can be calculated from this data. Results will be listed below.
Some motors can be upgraded or salvaged with impressive improvements.
For some applications of these, see REPOWER EXAMPLES BACK TO METHODS INDEX BACK TO REPOWER BACK TO REPOWER ANALYSIS BACK TO REPOWER EXAMPLES BACK TO SUPER MOTOR |
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