SCIENCE AND TECHNOLOGY ENGLIAH FOR MECHANICAL ENGINEERING Hydraulic devices can generate much more power in the same volume than can electrical devices The reason for this lies in the characteristics of the materials used in electrical equipment. The very best armature steels can develop only the equivalent of bout 200 psi in tractive power before they become saturated. By comparison, 3000 psi hydraulic equipment is very common and pressures up to 5000 psi are not rare 使饱和 电枢,转子 Because of the greater pressure density, hydraulic equipment in power sizes greater than I hp. tends to be mach smaller than electrical motors and somewhat smaller than pneumatic motors horsepower Hydraulic motors support heavy or springy loads much better than do electrical or pneumatic motors. Looking from the load back into the motors, electrical fields or compressed gasses are quite soft. The relatively incompressible oil is however. stiff.SCIENCE AND TECHNOLOGY ENGLISH FOR MECHANICAL ENGINEERING Hydraulic devices can generate much more power in the same volume than can electrical devices. The reason for this lies in the characteristics of the materials used in electrical equipment. The very best armature steels can develop only the equivalent of bout 200 psi in tractive power before they become saturated. By comparison, 3000 psi hydraulic equipment is very common and pressures up to 5000 psi are not rare. Because of the greater pressure density, hydraulic equipment in power sizes greater than l hp. tends to be mach smaller than electrical motors and somewhat smaller than pneumatic motors. Hydraulic motors support heavy or springy loads much better than do electrical or pneumatic motors. Looking from the load back into the motors, electrical fields or compressed gasses are quite soft. The relatively incompressible oil is, however, stiff. 使饱和 电枢，转子 horsepower