Contribution to Carbon Neutrality Using Brushless Motors

This information is current as of December 28, 2022.

The Paris Agreement, adopted at the 2015 United Nations Climate Change Conference (COP21), sets a goal of "limiting the increase in the global average temperature to well below 2 degrees Celsius above pre-industrial levels while pursuing efforts to limit to 1.5 degrees." Countries around the world are engaged in activities to achieve carbon neutrality by thesecond half of this century. To achieve carbon neutrality, it is essential to reduce energy consumption along with the use of clean energy and the reuse of CO₂ emitted. Looking at global energy consumption, since motors account for 53 %, replacing the motors currently in use with high-efficiency motors will lead to reduction in global energy consumption and achievement in carbon neutrality. This report explains the reduction effect of energy consumption for the high-efficiency brushless motor among various motors.

Contents

1. Introduction
2. Structure, Drive System, and Loss for Each Motor
- 2.1. Induction Motors
  - 2.1.1. Motor Structure
  - 2.1.2. Variable-Speed Drive of Induction Motors
- 2.2. Brushless Motors
  - 2.2.1. Motor Structure and Drive System
3. Efficiency Comparison of Each Motor
- 3.1. Efficiency Measurement Method
- 3.2. Comparison of Power Consumption at the Same Output Power
- 3.3. Comparison by Efficiency Maps
4. Comparison of Power Consumption Using Conveyor as an Example
- 4.1. Power Consumption at Constant Speed Drive
- 4.2. Effect on Power Consumption due to Rotation Speed Change
5. Comparison of Motor Size and Mass
6. Improvement in Efficiency of Fans by Brushless Motor
7. Summary

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1. Introduction

To achieve the goal of limiting the increase in the global average temperature to 2 degrees Celsius while striving for 1.5 degrees, all parties have created a reduction target of greenhouse gas and engaged in activities to reduce energy consumption. To reach carbon neutrality in 2050, Japan set a target of reducing greenhouse gas emissions by 46 % by 2030 from 2013 levels. In the "Sustainable Development Goals (SDGs)" adopted at COP21, Goals 1, 2, 11, and 13 include the mitigation of risks posed by climate change (see Figure 1).

Figure 1. SDG icons: Goals 1, 2, 11, and 13

Activities to prevent global warming are required on a global scale, and carbon neutrality is essential to achieving the goal. In order to achieve carbon neutrality in the industrial field, it is necessary to use renewable energy with low CO₂ emissions, to store and reuse CO₂, and to reduce CO₂ emissions by reducing energy consumption. Focusing on the reduction of energy consumption in particular, motors account for 53 % of global energy consumption (see Figure2), and replacing them with high-efficiency motors leads directly to carbon neutrality.
Many countries have introduced energy-efficiency regulations for electrical equipment, and motors are also subject to regulation because they account for more than half of global energy consumption. Motors used in continuous operation, such as compressors, pumps, and cooling fans, account for 70% of total power consumption by motors (see Figure 2), and the scope of regulations is expanding from the current induction motors to synchronous motors as well.
This report compares induction motors and brushless motors (synchronous motors) sold by Oriental Motor, and explains how to contribute to carbon neutrality in addition to the reduction effect of energy consumption by using brushless motors.