Energy Savings in Elevators by Using a Particular Permanent-Magnet Motor Drive

Vasileios I. Vlachou, Theoklitos S. Karakatsanis and Antonios G. Kladas ()
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Vasileios I. Vlachou: Laboratory of Electrical Machines and Power Electronics, Department of Electrical and Computer Engineering, National Technical University of Athens, 15780 Athens, Greece
Theoklitos S. Karakatsanis: Laboratory of Thermodynamics and Thermal Machines, Department of Production and Management Engineering, Democritus University of Thrace, 67100 Xanthi, Greece
Antonios G. Kladas: Laboratory of Electrical Machines and Power Electronics, Department of Electrical and Computer Engineering, National Technical University of Athens, 15780 Athens, Greece

Energies, 2023, vol. 16, issue 12, 1-30

Abstract: This paper presents the energy savings achieved by using a particular three-phase permanent-magnet motor drive control strategy in an elevator application. The proposed control methodology, based on a particular variable-amplitude variable-frequency voltage control pattern technique implemented in a permanent-magnet motor, is compared to a standard induction motor elevator case. By adopting appropriate simultaneous changes in the amplitude and frequency of the motor voltage, high speeds can be attained in conjunction with smooth starting and stopping actions involving a reduced supply current during the respective movement of the elevator. In addition, this method exhibits a high power factor with a good driving quality. The control technique introduced achieves the levelling-off of the floor and the group movement of the system using in the programmable memory a speed pattern that is generated targeting proportionality to the position of the lift. In that respect, significant energy savings can be obtained, which, depending on the type of motor implemented, can be up to 30% compared to the conventional techniques. These improvements can be attained with the appropriate handling of the applied pulse width modulation techniques. Various simulated and experimental results are given, illustrating the respective energy savings achieved with the proposed methodology.

Keywords: electric drive; elevator; energy savings; permanent-magnet motor; variable-voltage variable-frequency; induction motor; sinusoidal pulse width modulation; counterweight (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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