Calculators.

General
  Unit Conversion
  Periodic Table
Piping
  Darcy Weisbach
  Heating piping
  Water Hammer
Electrical
  Voltage Drop
  kVAR calculator
  Motor protection
  Motor sizing

Motor calculation for various applications.
 

1. Pump motor.

Pump motors are calculated using the following equation.

	/ 3600
P =		W
γ =		N/m3
Q =		m3/h
h =		m
n =

where :

γ stands for the fluid specific weight in  Ν/m3 (9810N/m3 for water and  8000 for petroleum).
Q stands for pump flow capacity in  m3/h.
h is the discharge height in m
η is the motor - pump system total efficiency factor  (0.50 ~ 0.70).

 

2. Lifts , elevators and cranes.

Motors for these applications are calculated using the following equation

	x 9.81
P =		W
G =		kp
v =		m/s
n =

where :

G is the maximum load to be lifted in  kp (1kp = 9.81N).
v is  the elevation velocity in  m/s.
η is the motor - pulley system total efficiency factor  (0.50 ~ 0.70).

When calculating  person lifts G we must add  75kg (=kp)  for each person.
If there is a contraweight we must divide the work load by 2.

For a  10 person lift with a contraweight , the load for the equation is
10 x 75kp = 750kp / 2 = 375kp

 

 

3. Fan - compressor motors.

Motors for these applications are calculated using the following equation

	x 27.7777
P =		W
Q =		m3/h
Dp =		bar
n =

where :

Q is the air flow in  m3/h.
Dp is pressure raise in  bar =10⁵  Pa (N/m2).
η is the motor - fan (or compressor)  system total efficiency factor  (0.50 ~ 0.70).

 

Before using the calculators
please read the Copyright and Disclaimer Notice.

Optimized for 1024x768 Screen view.   Last Update 14/01/2002 .