Incremental Encoder with Commutation Signals for Sinusoidal Commutation

Incremental rotary encoders with a second track—the Z1 track—provide one sine and one cosine signal (C and D) for each motor shaft revolution in addition to the incremental signals. For sine

commutation, rotary encoders with a Z1 track need only a subdivision unit and a signal multiplexer to provide both the absolute rotor position from the Z1 track with an accuracy of ± 5° and the position

information for speed and position control from the incremental track 

Some rotary encoders feature additional commutation tracks for sensing the rotor position during switch-on