| Title |
Frequency Distribution of Mechanical Noise Signals for Ultrasonic Waveand AE Sensor with Brush Spark of DC Motor |
| Authors |
Sang-Woo Lee ; In-Sik Kim ; Kwang-Sik Lee |
| Keywords |
Acoustic Emission Sensor ; DC Motor ; Ultrasonic Sensor ; Spark ; Fast Fourier Transform |
| Abstract |
In this paper, the frequency spectra from respective mechanical noise signals detected using ultrasonic wave and AE(Acoustic Emission) sensor were analysed to under spark generation between brush and commutator side with arbitrarily 15°rotation for brush from the DC motor in operation. Also, the frequency spectra from respective magnetizing noise signals detected using ultrasonic wave and AE sensor were analysed to under neutral point for brush from the DC motor in normal operation. And the analyses and comparison between the mechanical noise signal and magnetizing noise signal of ultrasonic wave with brush location change from the DC motor in operation. As the experimental results, the mechanical noise signal of ultrasonic wave under spark generation between brush and commutator side with brush location change from the DC motor in operation were increased about 2.5～3.0 times than magnetizing noise signal of ultrasonic wave form the DC motor in normal operation. Also, the main frequency band for mechanical noise signals of AE under spark generation between brush and commutator side with brush location change from the DC motor in operation, appeared about 1.3[㎒]～1.5[㎒] by the fast fourier transform. |