How To Calculate Power Of Dc Motor. Lets delve a bit into the theoretical calculations. This video demonstrates the circuit steps etc involved in determining the amount of current smaller brushed DC motors draw during no load load and stal.
R a is armature resistance. Determining Motor Loads Input Power Measurements When direct-read power measurements are available use them to estimate motor part-load. In this circuit the armature terminals of the DC motor are disconnected from the power supply and immediately connected across a resistor which acts as a load.
Equivalent circuit of DC motors.
Brushed motors were the first commercially important application of electric power to driving mechanical energyand DC distribution systems were used for more than 100 years to operate motors in commercial and industrial buildings. The smaller the resistance of the resistor the greater the rate of energy dissipation and the faster the motor slows down. HP E x I x Eff 746 Where HP Horsepower E Voltage I Current Eff Efficiency. An electric motors nameplate or rated power is its output power not its electric input power.
