Detection method, detection system, computer equipment and storage medium

The invention discloses a detection method, a detection system, computer equipment and a storage medium. The detection method is used for detecting whether a permanent magnet motor rotor is demagnetized or not. The detection method comprises the following steps: inputting a voltage into an observer; obtaining a back electromotive force observation value obtained by the observer based on voltage calculation; comparing the back electromotive force observation value with a preset back electromotive force; and determining whether the permanent magnet motor rotor is demagnetized according to the comparison result. According to the detection method provided by the embodiment of the invention, the calculation parameters are few, the algorithm is relatively simple, the calculation burden is reduced, the calculation error is reduced, hardware does not need to be additionally arranged for detection, the detection process is more intuitive and convenient, meanwhile, parameters sensitive to interference such as temperatu