induction motor vs hydraulic motor? are they equal in power? which can be used in heavier loads?

Question

i have a 30hp induction motor which powers a screw type extrusion with heavy load. my guess is the pressure inside the cylinder can reach up to or more than 1,500 psi which can cause over or under pressure. in effect, over pressure causes over coating, over heating, wear & tear to the cylinder and screw. (screw @ constant 30rpm, thats why it tends to over pressure. because it just keeps going and continue to build up pressure) under pressure causes undercoating. my intentions are to control the pressure inside by replacing induction motor to a hydraulic motor, my guess is that it would control the pressure inside by self adjusting the screw rpm, if i set a certain pressure to the hydraulic pump, will it maintain the set pressure inside the cylinder?? or self adjust the rotation speed?? like if the cylinder is overpressure it will slowdown to maintain the set pressure and if its under pressure it will compensate and attain the set pressure by rotating the screw faster??

Answer 1

either way you will wind up needing a pressure sensing device coupled to a throttling system weather you wind up varying voltage or hydraulic pressure will not matter as long as the desired pressure range is maintaned inside the cylinder.
as you are already electric you may as well stay that way as digital controls are much less expensive than the mechanical ones needed to control a hydraulic system.

Answer 2

I trust Don, pf is low while the motor is gently or no longer loaded, recuperating with load. however the present rises with load, so the time-honored result might nicely be that the present does no longer exchange lots over the burden selection. that is totally important with single area chop up area automobiles that have a tremendously reactive run winding.