Accelerometer Characteristics of a Drag-Cup Induction Machine

The two-phase drag-cup induction machine is analyzed using a generalized machine model and the performance equations solved by digital computer. Methods of determining machine parameters are examined and a method for experimental determination of stator to rotor mutual inductance and rotor self-inductance is developed using a procedure based on the least mean squared error criterion. Fuller and Trickey´s method is used for determination of the equivalent resistance of the drag-cup rotor. Computed accelerometer sensitivity values are experimentally verified for a particular machine. The effects of machine parameters upon the magnitude of accelerometer sensitivity and upon its variation with respect to speed are studied, and qualitative conclusions drawn regarding the most suitable parameter values for satisfactory accelerometer performance. The results should provide useful guidelines in selecting a suitable induction machine for use as an accelerometer and for the use of the designer in designing a machine to have specified accelerometer characteristics.