Improvements in energy efficiency of induction motors by the use of magnetic wedges

2011 ◽  
Author(s):  
Radu Curiac ◽  
Harry Li
Keyword(s):  
Energy Efficiency ◽  
Induction Motors

scholarly journals Energy Efficiency Analysis of Fixed-Speed Pump Drives with Various Types of Motors

2019 ◽  
Vol 9 (24) ◽  
pp. 5295 ◽  
Author(s):  
Victor Goman ◽  
Safarbek Oshurbekov ◽  
Vadim Kazakbaev ◽  
Vladimir Prakht ◽  
Vladimir Dmitrievskii
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Duty Cycle ◽  
Induction Motors ◽  
Electric Motors ◽  
Pump Unit ◽  
Permanent Magnet Synchronous Motors ◽  
Variable Flow ◽  
Synchronous Motors ◽  
Flow Pump

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

Analysis of possibility of application of induction motors with various number of phases

2020 ◽  
pp. 70-73
Author(s):  
Nikolay Nikolaevich Androsov ◽  
◽  
Igor Stanislavovich Tsikhalevskiy ◽  
Konstantin Andreevich Vakhrushev ◽  
◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Induction Motor ◽  
Induction Motors ◽  
Maximum Speed ◽  
Mechanical Loads ◽  
Traction Motors ◽  
Three Phase ◽  
Speed Range

The paper analyses operational indicators of electric locomotives with commutator and induction motor traction motors. It is established that, due to the inherent limitations of the commutator motors, electric locomotives can work with rated power in speed range of 51.2–79 km/h, at maximum speed of 100 km/h power doesn’t exceed 68 % of rated. In order to increase the energy efficiency the authors have proposed to widen by several times the speed range at a constant rated power and reduce as much as possible operation at overload modes. Induction motors have significantly wider ranges for electromagnetic, thermal and mechanical loads. The calculation of losses in converter of phases and frequency for induction motors with various number of phases showed that total losses of three-phase motor reach 1.9 %, losses of motor with even number of phases doesn’t exceed 0.8 %. As a result, it is preferable to use traction motors with 8-phase winding.

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