Hysteresis cable reel series JH adopts installation mode of drive axis perpendicular to the main axis to improve the maintenance performance . It adopts non- contact type permanent-magnet coupling as differential speed synchronous equipment, having longer service life and ideal coiling characteristic to get long term locked. The product is widely used for the mobile mechanical equipments such as port portal crane, ship loader, tower crane and etc. It is provided with one or many magnetic hysteresis.