FORMULAS
     
 
HP = Torque(Lb.Ft.) * RPM / 5250 Torque = HP * 5250 / RPM Ohms = Volts / Amps
     
Volts = Amps * Ohms Amps = Volts / Ohms  
     
DC Power
   
     
HP = Volts * Amps * Efficiency / 746    
     
Watts = Volts * Amps Amps = Watts / Volts  
     
AC Power
   
     
Efficiency = 746 * Output HP / Input Watts    
     
3 Phase Kilowatts = Volts * Amps * Power Factor * 1.732 / 1000  
     
3 Phase Volt-Amps = Volts * Amps * 1.732    
     
3 Phase Amps = 746 * HP / 1.732 * Volts * Efficiency * Power Factor  
     
3 Phase Efficiency = 746 * HP / Volts * Amps * Power Factor * 1.732  
     
3 Phase Power Factor = Input Watts / Volts * Amps * 1.732  
     
1 Phase Kilowatts = Volts * Amps * Power Factor / 1000  
     
1 Phase Amps = 746 * HP / Volts * Efficiency * Power Factor  
     
1 Phase Efficiency = 746 * HP / Volts * Amps * 1.732  
     
1 Phase Power Factor = Input watts / Volts * Amps * 1.732  
     
HP (3 Phase) = Volts * Amps * 1.732 * Efficiency * Power Factor / 746  
     
HP (1 Phase) = Volts * Amps * Efficiency * Power Factor / 746  
     
Operating Speed
   
     
Speed = WK 2 * Speed Change / 308 * Avg. Accel. Torque  
     
WK 2 = Rotor Inertia + Load Inertia (Lb.Ft.) 2  
     
Avg. Accel Torque = [(Full Load T + Max. T) / 2] + Max.T + Locked Rotor T / 3  
     
Load WK 2 (at shaft) = WK 2 (load) * Load RPM 2 / Motor RPM 2  
     
Shaft Stress (P.S.I.) = HP * 321.000 / RPM * Shaft Diam. 3  
     
Ambient Temperature = The temperature of the surrounding cooling medium.  
     
Rated Temperature Rise = The permissible temperature above ambient when operating under load.
     
Conversion Chart
   
     
Force and Weight
Torque
   
Grams
*
.0353
=
Ounces
Kilograms
*
2.205
=
Pounds
Newtons
*
.2248
=
Pounds (force)
Ounces
*
28.35
=
Grams
Pounds
*
453.6
=
Grams
Pounds (force)
*
4.448
=
Newtons
Tons (short)
*
907.2
=
Kilograms
Tons (short)
*
2000.0
=
Pounds
Grams-Ventimeters
*
.0139
=
Ounce-inches
Newton-meters
*
.7376
=
Pound-feet
Newton-meters
*
8.851
=
Pounds-inches
Ounce-inches
*
72.0
=
Gram-centimeter
Pound-feet
*
1.3558
=
Newton-meters
Pounds-inches
*
.113
=
Newton-meters
Tons (short)
*
907.2
=
Kilograms
Tons (short)
*
2000.0
=
Pounds
     
Energy or Work
Power
   
Btu
*
778.2
=
Foot-pounds
Btu
*
252.0
=
Gram-calories
Btu / hour
*
.293
=
Watts
HP
*
550.0
=
Ft.Lb. / second
HP
*
746.0
=
Watts
Kilowatts
*
1.341
=
HP
     
Formulas
   
     
 
Needed torque (Mrequired)and displacement of mptp (Vmotor) can be calulated with formulas.
   
Oil flow (Q), displacement of pump (Vpump) and hydraulic power (P) can be calculated with formulas:
   
Tractive effort T / W  
   
Agri (e.g. sprayer, harvester 0.3 - 0.6
Road (e.g. paver) 0.5 - 0.8
Logging (e.g. harvester) 0.8 - 1.0
Mining 0.8 - 1.0
Assist drive 0.2 - 0.3
      
Rolling resistance factor K  
Good Bad
Asphalt 0.012 0.022
Agric. Grounb 0.100 0.035
Sand 0.060 0.150
Down 0.160 0.300
   
   
Terminology    
 
   
Example (Vmotor)
 
 
   
Terminology    
 
   
Example (Vmotor)