Rotor position measuring device and method for bearingless magnetic suspension motor

The embodiment of the invention provides a bearingless magnetic suspension motor rotor position measuring device and method, and belongs to the technical field of motors. The device comprises a bearingless magnetic suspension motor, a first group of Hall sensors and a calculation module, the first group of Hall sensors comprises N first Hall sensor pairs; the calculation module is used for comparing a first output signal of the first Hall sensor of the ith first Hall sensor pair with a second output signal of the second Hall sensor to obtain an ith first analog signal; carrying out subtraction operation on the N first analog signals to obtain a first voltage signal; carrying out additive operation on the N first analog signals to obtain a second voltage signal; and determining a current actual angle of the rotor according to the first voltage signal and/or the second voltage signal. Through the provided scheme for measuring the position of the bearingless magnetic suspension motor rotor, the accurate calculat