High-precision rotor magnetic bridge deformation testing method

The invention discloses a high-precision rotor magnetic bridge deformation testing method, which comprises the following steps of: firstly, embossing concave hardness points which are distributed in a matrix on the surface of a magnetic bridge region needing to be detected of a rotor punching sheet sample, coating powder and marking, and then carrying out an overspeed rotation test; image processing is carried out on photos before and after the test, displacement changes of hardness points in a magnetic bridge area are identified to obtain equivalent strain of the magnetic bridge of the sample, and the equivalent strain is averaged. The method is convenient to operate and high in efficiency, the prepared mark points are uniform and clear, the recognition degree is high, the method is suitable for preparing mark points in a tiny area, the problem that rotor deformation is difficult to directly measure in the high-speed rotation process of the rotor can be well solved, deformation is represented by recognizing