https://blog.gongquiz.com/2022/11/23/%ed%9a%8c%ec%a0%84%ed%98%95%ec%a0%84%eb%8f%99%ea%b8%b0%ec%99%80-%ec%84%a0%ed%98%95%ec%a0%84%eb%8f%99%ea%b8%b0linear-motor%eb%a5%bc-%eb%b9%84%ea%b5%90%ed%95%9c-%ec%84%a4%eb%aa%85-%ec%a4%91-%ed%8b%80/