this is the fourth time I post, sorry but actually I am confused..

my problem is to control the speed of a 4hp DC motor, its rating is

180VDC

20A

I measured the Armature resistance and Field Resistance, both are (0.6 Ohm)

I want to know how to measure the lasting parameters:

Ke and Kt conatants

J (monent of inertia)

B (friction losses)

La and Lf (armature and field inductance)

after determining this parameters, I will be able to model the motor to control

it..

by the way, I need to brake the motor after the rotation, since it still rotates

for about 15 minutes after power of.. AND SO, what is the recommended, series wound

or shunt wound or separately excited?

what is the maximum current can field coil passes without damage, and also the starting

current can the armature passes?

I use external power resistor for Armature and Field, but it runs VERY VERY VERY hot !!!!!

I need your help, thanx a lot, and GOOD BYE

... Shendy