Annotation. A brushless DC (BLDC) motors diagnostics system based on the model approach in the state space is developed. A digital twin representing a model of BLDC motor and working in parallel with a real BLDC motor is designed. The BLDC motor are analyses using electric current and angular velocity sensors signals and the output signals of the digital twin. Based on the magnitude of the residual, the presence of defects in the real BLDC motor is determined. If the defect value is insignificant, then appropriate maintenance actions are recommended. In case when the defect value is significant, it is necessary to perform emergency termination of the engine operation.
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