Does The Inverter Can Really Energy Savings?

inverter energy savings

The inverter energy savings? Is that true?

The answer is YES!


In the following content, we have sorted out some of the customer’s questions about inverter energy savings. Expect the practical energy savings effect by the different working situations.

Question 1:

If two identical motors work at 50HZ power frequency, one uses an inverter, the other does not.

Rotational speed and torque are in a rated state of the motor.

So, can the inverter save electricity?

How much energy can it save?



In this case, the inverter can only improve the power factor.

The inverter energy savings can not be realized.


Question 2:

If the torque of two identical motors does not reach the rated torque of the motor (frequency, speed is 50HZ).

how much energy can inverter saving?



If the automatic energy-saving operation is used, this time inverter can operate under reduced voltage, which can save part of the power, but the energy savings is not obvious.


Question 3:

Under the same conditions,

how much can be saved under no-load condition?

Which of the three states saves more?



The no-load state of the drag-type load can not do more energy savings.

For example, I think there is room for discussion on the “closed-loop” control.

Closed-loop control is not only the feedback of the speed sensor. Frequency control in vector control is closed-loop control, and it is closed-loop control inside the device. V/F control belongs to open-loop control. In addition, there is PID regulator feedback control of temperature, pressure, flow, and other physical quantities, which are all the categories of closed-loop control. And all can be achieved by adjusting the frequency converter, so the concept of closed-loop control should not be interpreted so narrowly.


In some cases, it can save more than 40% of energy, but in some cases, it will be more wasteful than not connected to the inverter. The inverter is energy-savings by reducing voltage with a light load. The energy-savings of driving distance load is very weak because the speed of speed does not change much, even if the voltage is lowered.

But in the fan environment is different, when a small amount of wind is needed, the motor will reduce speed. We know that the energy consumption of the fan is proportional to the 1.7 power of the speed, so the motor’s pitch will drop sharply and the inverter energy savings effect is obvious. If we use it in oil wells, it will waste a lot of energy because of using brake resistance on the return trip.

Yankang Blow Molding Machine adopts SIEMENS Inverter, more stable, and more energy savings.

blow molding machine configuration

Of course, if the environment requires speed regulation, the inverter energy-savings effect is relatively obvious. In the case of no speed regulation, the inverter will not save energy, but can only improve the power factor.


As an electronic circuit, the converter itself also consumes electricity (about 3-5% of rated power). A 1.5-piece air conditioner also consumes 20-30W, which is equivalent to a long light.

It’s a fact that the inverter has a function of saving electricity under the condition of power frequency.


However, it needs certain preconditions.

High power and it’s for fan and pump loads.

The device itself has the function of saving electricity.

Long-term continuous operation


These are the three conditions that reflect the effect of power-saving.

In addition, there is no point in energy savings or not.


Next is Welfare Time, inverter overload trip is a common problem during working.

So, this article will help you a lot: Causes and Inspection Methods of Frequency Inverter Overload Trip.


If we do not add preconditions to say that the power frequency operation of frequency converters can save energy, it is an exaggeration or commercial hype. Knowing the origin, you will use him skillfully to serve you.

We must pay attention to the use of occasions and conditions in order to properly apply, Otherwise, you won’t get the desired effect.


That’s all. The article about inverter energy savings is ending here.

Have you got useful information from it?

If you have other question about blow molding machine,

We have prepared various articles here: Blow Molding Machine Blog.

Thanks For Reading.

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