Motor stator inner diameter detector

The invention discloses a motor stator inner diameter detector which comprises a base, a rotating disc and a main support, a vernier frame is arranged on the main support, and a capacitive grating sensor for measuring the inner diameter of a motor stator and a digital display module are arranged on the vernier frame; vernier scales are arranged on the vernier frame in a sliding mode and symmetrically arranged on the left side and the right side of the main support, conductive probes are arranged at the ends of the vernier scales, and the conductive probes are in communication connection with the digital display module. The conductive probe comprises a left rear probe, a left front probe, a right rear probe and a right front probe, the left rear probe and the left front probe are respectively arranged at the end part of the vernier on the left side of the main bracket, and the right rear probe and the right front probe are respectively arranged at the end part of the vernier on the right side of the main brack