MOTOR SPEED CALCULATION 

MAXON 221024 - 5.0V motor,  RE-max 21mm,  3.5W  
MOTOR:     
no load speed voltage

no load speed

no load current

stall torque

torque constant

speed constant

Speed-torque gradient:  

armature resistance

Gearbox,  GP22A, (0.5 - 1.0 Nm out),  110340, 370:1 
Gear Ratio

gearhead efficiency

GIVEN: 
Torque (Static dry) = 40 ozf in.
Torque (both Static and Dyn) at 100psi Hydraulic press. = 44 - 48 ozf in.
ASSUME:  Delta of 8 ozf in / 100psi
Therefore at 450psi Torque required to turn the valve will be = 40+(4*8) = 82 ozf in.
ASSUME: Safety Factor of 1.5
Then required Torque = 1.5*82 = 123 ozf in = 7.7 lbf in = 869.98 mNm

REQ: 
Find the valve stem speed of rotation @ 5.0V. @ load  
actual motor voltage

actual no load speed

Motor Speed @ Load: 

GearBox Output speed:  

1/4 Turn Valve Rotation Time : 

Torque at the motor: 

required current for desired torque

total motor current at load:  

power dissipated by motor
Joule losses dissipated by motor

Mech losses dissipated by motor

REQ: 
Find the valve stem speed of rotation @ 4.0V. @ load  
actual motor voltage

actual no load speed

Motor Speed @ Load: 

GearBox Output speed:  

1/4 Turn Valve Rotation Time :