The paper presents a comparative analysis of energy consumption by 2.2 kW electric\nmotors of various types and energy efficiency classes in the electric drive of a pump unit with\nthrottle control in a water supply system. Line-start permanent-magnet synchronous motors of the\nIE4 energy efficiency class and induction motors of the IE4 and IE3 energy efficiency classes of\nvarious manufacturers were considered (IE4 and IE3 are labels of energy efficiency classes of electric\nmotors according to IEC 60034-30-1 standard). Energy consumption at a hydraulic load changing\nunder a typical duty cycle was calculated based on the nameplate data of the pump and electric\nmotors. The developed method shows that selecting an electric motor based on the IE energy\nefficiency class under the IEC 60034-30-1 standard (i.e., based on efficiency at a rated load) may not\nprovide the minimum energy consumption of a variable flow pump unit over a typical duty cycle.\nIn particular, the considered IE4 class line-start permanent-magnet synchronous motors do not\nprovide significant advantages over IE4 class induction motors, and sometimes even over IE3 class\ninduction motors when they are used in variable flow pump units.
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