bo phan can diu co tac dung xac lap nhanh chong vi tri can bang cua phan dong. Co 3 loai can diu thuong dung la can diu khong khi, can diu can ung tu va can diu chat long

- can diu khong khi:

bao gom 1 hop kin ben trong co canh chuyen dong duoc gan vao truc phan dong. Khi phan dong quay, canh' chuyen dong tao ra su chenh lech ap suat khong khj gjua 2 phan hop can lai su dao dong cua phan dong.

- can diu cam ung tu

bao gom 1 la' nhôm mong (gan voi phan dong) di chuyen trong khe ho cua mot nam cham vinh cuu (gan voi phan tinh). Nguyen li can diu dua tren su tac dung tuong ho gjua tu truong cua nam cham voi dong cam ung trong la' nhom chuyen dong trong tu truong cua nam cham.

- can diu chat long

bao gom 1 dia dong gan voi truc phan dong va 1 dia tinh. Giua dia dong va tinh tiep xuc nhau thong qua lop chat long. Khi phan dong chuyen dong se hinh thanh luc ma sat giua phan dong va phan tinh thong qua chat long tao nen momen can diu. Uu diem co cau tao gon nhe, de che' tao. Yeu cau doi voi chat long can diu la do nhot it phu thuoc vao nhiet do moi truong