Performance calculations on polyphase reluctance motors (synchronous motors without field excitation)

IN 1926, Messrs. Doherty and Nickle presented their classic paper on “Synchronous Machines” giving a complete and thorough analysis. Since many fractional horsepower engineers have occasion to design small reluctance motors (synchronous motors without field excitation) and these engineers in general have no need of becoming thoroughly familiar with the great and extensive field of synchronous motor theory, it has seemed advisable to simplify the equations from this famous paper by eliminating the terms having to do with field current and to arrange them in the form of a simple calculation sheet. It also has been found possible by the use of calculated curves to arrange a simple method of calculating the synchronous pull-out torque.