High Frequency Noise Analysis "Brush Noise Analysis"

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last updated：May 15, 2015

エム・イー・エル

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Example of motor brush noise wraparound analysis

An analysis of motor brush noise on the control board was conducted. When an impulse signal simulating brush noise was applied, significant noise was confirmed to be superimposed on the CPU communication signal terminal. It was found that inserting a 0.1μF capacitor at the motor terminal could significantly suppress the noise at the CPU terminal. However, using low-frequency electrolytic capacitors with self-resonance as noise killer capacitors was found to worsen the noise level at the CPU terminal compared to not using a capacitor. 【Features】 ○ The communication signal enters the CPU communication terminal via the path X1→IC3→CPU. ○ Investigate the effects when impulse noise is applied to the motor terminal. ○ Noise analysis requires an analysis of the entire board, including the implemented components. For more details, please contact us or download the catalog.

Related Link - https://www.melinc.co.jp/sample/pcb.html

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【Features】 ○ Analyzed motor brush noise on the control board. ○ When an impulse signal simulating brush noise was applied, it was confirmed that significant noise was superimposed on the CPU communication signal terminal. ○ By inserting a 0.1μF capacitor at the motor terminal, it was found that the noise at the CPU terminal could be significantly suppressed. ○ It was revealed that using an electrolytic capacitor or similar with low frequency self-resonance as a noise killer capacitor worsened the noise level at the CPU terminal compared to not using a capacitor. ● For more details, please contact us or download the catalog.