China
Africa
Explore chapters and articles related to this topic
Electrical Systems
Published in Moncef Krarti, Energy Audit of Building Systems, 2020
Based on their efficiency, motors can be classified into two categories: (i) standard-efficiency motors and (ii) high- or premium-efficiency (i.e., energy-efficient) motors. The energy-efficient motors are 2–10 percentage points more efficient than standard-efficiency motors, depending on the size. Table 5.2 summarizes the average efficiencies for both standard and energy-efficient motors that are currently available commercially. The improved efficiency of the high- or premium-motors is mainly due to better design and use of better materials to reduce losses. However, this efficiency improvement comes with a higher price of about 10–30 percent more than standard-efficiency motors. These higher prices may be the main reason that only one-fifth of the motors sold in the United States are energy efficient.
Mechanical Drive Applications Overview
Published in Neil Petchers, Combined Heating, Cooling & Power Handbook: Technologies & Applications, 2020
Premium-efficiency motors typically cost 20 to 30% more than standard-efficiency motors, depending on capacity and speed. The cost premium is largely the result of the use of more and better materials. Lamination material is a higher grade, higher cost steel. Typical standard-efficiency motors use low-carbon steel laminations, while premium-efficiency motors typically use high-grade silicon steel laminations that are thinner but have lower electrical losses. There are also more laminations and the rotor and stator core are lengthened. In addition, the laminations slots are larger in premium-efficiency motors, so more larger- diameter copper can be used in the windings. Friction and windage losses are reduced in premium-efficiency designs. Premium-efficiency motors tend to run at lower operating temperatures, resulting in longer life for lubricants, bearings, and motor insulation. They also generally operate at higher PFs.
HVAC Basics
Published in Herbert W. Stanford, Adam F. Spach, Analysis and Design of Heating, Ventilating, and Air-Conditioning Systems, 2019
Herbert W. Stanford, Adam F. Spach
Polyphase motors, located indoors or otherwise weather protected, should be in accordance with NEMA Publication MG 1, Design B, medium duty induction open ODP type with 1.15 service factor and Class F insulation, rated as “Premium” efficiency motors, meeting the requirements of DOE in the United States or the requirements of IEC 60034-30 IE3 ratings promulgated by the European Union. The use of premium efficiency motors reduces energy consumption by an average 6% (2%–10% depending on motor rating) over standard efficiency motors.
Genetic Algorithm & Fuzzy Logic-based Condition Monitoring of Induction Motor Through Estimated Motor Losses
Published in IETE Journal of Research, 2023
G. S. Ayyappan, B. Ramesh Babu, M. Raja Raghavan, R. Poonthalir
The induction motors are broadly classified based on their operating efficiency levels as per the International Efficiency Standard 60034-30-1 [14,15]. As per the IE class, the motors are classified as IE1, IE2, IE3 & IE4 levels. Similarly, NEMA has classified the motors into Standard Efficiency, Energy Efficient, Premium Efficiency & Super Premium Efficiency motors. European Committee of Manufacturers of Electric Machines and Power Electronics (CEMEP) classified the motors into three categories; namely EFF1, EFF2, and EFF3. Table 1 shows the comparable levels of energy efficiency between NEMA, IE class, and CEMEP standards [12].