Encoder, motor and driving system

The invention provides an encoder, a motor and a driving system. The encoder is used for being installed on a to-be-installed component which is at least partially movable so as to measure position information of movement of the to-be-installed component, the to-be-installed component comprises an optical component and a magnetic component, and the encoder comprises a circuit board; the surface of the optical component is provided with light-transmitting or light-reflecting code channels which are alternately dark and bright. The circuit board comprises a magnetic induction module, a light induction module and a signal processing module connected with the light induction module and the magnetic induction module. The magnetic induction module corresponds to the magnetic component; the light induction module is arranged corresponding to a code channel of the optical component; the magnetic component comprises at least one of magnetic steel, a magnetic ring, a magnetic drum and a magnetic ruler, and the magnetic