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P = ωT
2πnT
    P=      Watts
        60
Transposed for T

   60P
T=     Newton meters
   2πn
Where
T = torque in Newton /meters (Nm)
P = power output in watts (W)
n = the speed of rotation in revolution per
 minute (rpm).
Example:
In the previous example; what is the out
put power, if the DC motor is rotating at
1100 rpm?
2πnT
P=      Watts
    60
2 x 3.146 x 1100 x 36.3
P=                        = 4.18 kW
             60
Direction of
                                 Single coil
Induced emf in coil




   two - segment               Pole
    commutator                 (shown above the coil)




                      Direction of rotation
        Brushes
Calculate Torque or Power from RPM using P=2πnT/60
Calculate Torque or Power from RPM using P=2πnT/60

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Calculate Torque or Power from RPM using P=2πnT/60

  • 1.
  • 2.
  • 4. 2πnT P= Watts 60 Transposed for T 60P T= Newton meters 2πn
  • 5. Where T = torque in Newton /meters (Nm) P = power output in watts (W) n = the speed of rotation in revolution per minute (rpm).
  • 6. Example: In the previous example; what is the out put power, if the DC motor is rotating at 1100 rpm?
  • 7. 2πnT P= Watts 60
  • 8. 2 x 3.146 x 1100 x 36.3 P= = 4.18 kW 60
  • 9.
  • 10. Direction of Single coil Induced emf in coil two - segment Pole commutator (shown above the coil) Direction of rotation Brushes