Which D.C. motor has got maximum self relieving property?

dc motor without load theoretically danger due to un controlled speed but when dc series motor connected load armature draw a more power and this power create powerfull toque but the current flow a field winding this cause of reason motor run slow but more torque or this torque handle havy load with no tension
this is the reason

DC series motor develops large starting torque initially and slow down with increase in load and so get automatically relived from heavy excessive load. Thus, DC series motor is called as self-reliving machine.