Calculation method of working power of energy storage motor

How can you calculate a motor's part-load?

To calculate a motor's part-load, first measure the three-phase input power to the loaded motor using Equation 1. Then, compare this measured input power under load to the power required when the motor operates at rated capacity, using Equation 3.

How do you calculate mechanical power in an electric motor?

In an electric motor, the mechanical power is defined as the speed times the torque. Mechanical power is typically defined as kilowatts or horsepower, with one W equaling 1 Joule/sec or 1 Nm/sec. Figure 9: Mechanical power measurements in watts are defined as two times Pi times the rotating speed (rpm) divided by 60 times the torque (Newton-Meter).

How to test a PWM based drive and motor system?

Complete testing of a pulse width modulation (PWM)-based drive and motor system is a three-step process. Step 1 is accurate measurement of PWM VFD input and output power to identify drive eficiency and power losses. Step 2 is accurate measurement of motor input power. Step 3 is accurate measurement of motor mechanical power.

How is power delivered to a load in a motor?

In a motor, power is delivered to the load by converting electrical energy per the following laws of science. In electrical systems, voltage is the force required to move electrons. Current is the rate of the flow of charge per second through a material to which a specific voltage is applied.

How is the efficiency of a motor measured?

To measure the efficiency of a motor, Test Method A as defined by IEEE 112 can be used. The efficiency is calculated as the ratio of the measured output power to the measured input power, after applying temperature and dynamometer corrections if necessary.

What is the eficiency equation for a motor?

For an electrically driven motor, the output power is mechanical while the input power is electrical, so the eficiency equation becomes eficiency = mechanical power/electrical input power. Complete testing of a pulse width modulation (PWM)-based drive and motor system is a three-step process.