The huge involvement of Internet in business has taken up eCommerce industry to new heights. The numerous benefits of selling online compels many vendors to join this industry and earn good profits. When

동기속도 N[rpm] 주파수(f) * 2 / 극수 * N .. 여기서 N은 초당 회전수 이므로 분으로 변환하기 위해 60을 대입. n=120f / p 가 성립.