Abstract
This paper analyses the condition of a partial short-circuit in a brushless permanent magnet motor. Additionally, the problem was analysed for three stator winding configurations: star, delta and star-delta connection. The paper presents an original mathematical model allowing a winding configurations to be analysed. What is more, the said mathematical model allows taking account of the partial short-circuit condition. Frequency analysis (Fast Fourier Transform—FFT) of the artificial neutral point voltage was proposed for the purpose of detecting the partial short-circuit condition. It was demonstrated that a partial short-circuit causes a marked increase in the diagnostic frequencies of the voltage signal. The proposed brushless permanent magnet motor diagnostic method is able to detect the fault regardless of the stator winding configuration type.
Highlights
Brushless permanent magnet motors are an attractive alternative to typical induction motors [1,2,3,4,5]
Due to the limitations in terms of the available space and the weight of the driving unit, permanent motors are the only alternative [10,11]. Electric equipment of this type is successfully used in the drives intended for small unmanned aerial vehicles (UAVs) [12]
The effects of a partial short-circuit depend on the winding configuration type
Summary
Brushless permanent magnet motors are an attractive alternative to typical induction motors [1,2,3,4,5]. The authors of this paper have successfully applied this method to detect a typical fault condition, i.e., an open-circuit in one of the windings of a BLDC motor [26]. The paper analyses symmetrical operation as well as the performance of the drive system in the selected fault condition, i.e., a partial short-circuit, in one of the phases of the stator winding of the BLDC motor for star, delta as well as star-delta winding configuration. Fast Fourier Transform (FFT) of the voltage signal in the form of the voltage of the so-called artificial neutral point, a method which can be used regardless of the motor winding configuration type, was used for the purpose of monitoring the performance of the drive system featuring a BLDC motor. The proposed method based on FFT analysis of the artificial neutral point voltage is, in the authors’ opinion, suitable for multi-channel power supply
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