Motor Load Calculator

Motor Load Calculator:

Enter the values of output power, P_m(kW)and  input power, P_i(kW)to determine the value of Motor Load, L.

Enter Output Power :		kW
Enter Input Power:		kW
Result – Motor Load:		%

Motor Load :

Motor Load is a measure of how much of a motor’s rated power capacity is being used during operation. It represents the proportion of mechanical power a motor produces compared to the electrical power it consumes.

The load indicates how effectively the motor is being utilized in a given application. A motor operating close to full load runs efficiently and economically, while a lightly loaded motor may waste energy. Motors that are consistently underloaded or overloaded can suffer from efficiency loss, overheating, or premature failure.

Knowing the motor load is critical for energy management, preventive maintenance, and optimal performance. It also helps in selecting appropriately sized motors during system design. Overloaded motors may draw excess current, which can trip protection devices.

On the other hand, motors running at less than 50% load operate inefficiently and increase energy costs. Monitoring motor load helps in reducing downtime, managing load distribution, and improving system reliability.

Load values are typically expressed as a percentage or a decimal (e.g., 0.85 = 85% load). The mechanical output is often measured in kilowatts (kW) or horsepower (HP), and the input power is measured in kilowatts (kW). The load factor is crucial in industrial applications where power efficiency matters.

Motor Load, L in percentage equals mechanical output power, P_m(kW)in kiloWatts divided by electrical input power, P_i(kW)in kiloWatts multiplied by 100.

Motor Load, L = (P_m(kW)/ P_i(kW)) * 100

L = motor load in percentage.

P_m(kW)= output power in kilowatts, kW.

P_i(kW)= input power in kilowatts, kW.

Motor Load Calculation:

1. A motor delivers a mechanical output power6 kW and consumes an input electrical power 7.5 kW. Find the load on the motor.

Given: P_m(kW)= 6kW, P_i(kW)= 7.5kW.

Motor Load, L = (P_m(kW)/ P_i(kW)) * 100

L = (6 / 7.5) * 100

L = 80%.

2. A motor operates at 90% load and consumes an input power 10 kW. Find the mechanical output power.

Given: L = 90%, P_i(kW)= 10kW.

Motor Load, L = (P_m(kW)/ P_i(kW)) * 100

P_m(kW)= L / 100 * P_i(kW)

P_m(kW)= 90 / 100 * 10

P_m(kW)= 0.9 * 10

P_m(kW)= 9kW.