Sophisticated interface for measures on alternative motors connectable to a microcomputer

The authors describe the realization of an instrumentation interface which can measure all electromechanical variables, such as current and voltage (instantaneous, average, fundamental, etc.), cosφ, and speed, on any alternative motor (synchronous or asynchronous). It can be used manually or controlled by a microcomputer and, in the latter case, the software can deduce other electromechanical variables such as power or mechanical couple