The CRSM1 module measures the speed of a DC electric motor based on the ripple in the motor's supply current.
The module's input signal is the voltage across a typical 50 millivolt current shunt. The module provides parallel digital outputs for indicating the measured speed. The module also has an analog output whose voltage is proportional to speed of rotation.
The digital speed output is presented in revolutions per minute (RPM). The analog speed output, varies from 0V to 10V DC according to speed of rotation. Isolated current transmitter output varies from 0-10V.
The CRSM1 module can be used for advanced motor performance analysis due to its ability to accurately track both speed and current during acceleration from stop to full speed.
Click for advantages of using current to sense motor speed.