Energy-efficient electric motors
Electric motors consume a significant portion of the electricity produced. According to various estimates, asynchronous motors consume from 50 to 80%, and synchronous motors - from 6 to 8% of all electricity produced. The use of high efficiency motors can significantly reduce energy consumption, as well as reduce environmental impact and operating costs.
Energy efficiency concept
Energy efficiency means the optimal use of energy, allowing for lower energy consumption for the same load power. It is known that engines lose a lot of energy in the form of heat during operation. The main indicator of the energy efficiency of electric motors is efficiency - this is the ratio of useful energy used to the total energy received by the system.
Main types of losses
The main types of losses are conventionally divided into:
• Mechanical losses (arise from friction, vibrations in moving parts of the engine).
• Magnetic losses (eg due to eddy current or Foucault current effects).
• Electrical losses (loss of energy in steels and flow of currents).
Energy efficiency classes
The IEC organization has developed a classification of energy efficiency of electric motors according to the IEC 60034-30-1 standard, which distinguishes the following classes:
• IE1 – standard class;
• IE2 – high energy efficiency class;
• IE3 – super high class;
• IE4 – premium class.
Characteristics of electric motors
• Efficiency: IE3 motor has higher efficiency compared to IE2 motor.
• Winding temperature: The IE3 motor has lower winding temperatures, which means less heat loss.
• Noise level: The IE3 motor has a reduced noise level compared to the IE2 motor.
Using IE1 motors
IE1 class motors are usually used in applications where energy savings are not a priority. However, in cases where it is important to reduce energy costs and reduce the impact on the environment, it is advisable to use electric motors of the highest energy efficiency classes (IE2, IE3, IE4).
Using energy-efficient electric motors is an important step to reduce energy consumption, reduce operating costs and minimize the negative impact on the environment. Choosing a motor with a higher energy efficiency class not only saves energy, but also improves working conditions by reducing noise and heat loss.
Advantages of energy efficient motors:
Cost savings:
● Energy-efficient motors save energy, which can lead to significant savings on your energy bills.
● For example, replacing only 10 old engines with new energy-efficient ones can save an enterprise thousands of hryvnias per year.
Reduced greenhouse gas emissions:
● Energy-efficient engines consume less electricity, resulting in lower greenhouse gas emissions from power plants.
● This makes them an important tool for combating climate change.
Productivity increase:
● Energy-efficient motors run quieter and cooler than conventional motors, which can improve equipment performance and life.
● They can also help improve working conditions by reducing noise and heat.
Increased reliability:
● Energy efficient motors typically have a simpler design and fewer moving parts, making them more reliable than conventional motors.
● This can result in lower maintenance and repair costs.
Tax benefits:
● Many countries offer tax incentives for businesses using energy efficient motors.
● These incentives can help reduce the initial cost of purchasing and installing energy efficient motors.
