Angular displacement self-feedback stepping motor unit

The invention belongs to the field of stepping motor design, in particular to an angular displacement self-feedback stepping motor unit. In the industrial field, a photoelectric encoder or the like can be used to achieve high-precision position feedback, but it is difficult to adapt to the use requirements of harsh operating conditions such as high temperature, vibration and impact of aero engines. The angular displacement self-feedback stepping motor unit disclosed by the invention comprises a stepping motor and a reducer in a unit shell, wherein the angular displacement self-feedback stepping motor unit further comprises a primary angular displacement sensor, an angle comparator and a secondary angular displacement sensor; the secondary angular displacement sensor and the primary angulardisplacement sensor are cascaded at an input end and an output end of the reducer, respectively, the angle comparator is connected between the secondary angular displacement sensor and the primary angular displacement sensor