Authors: I.Yu. Popolzin, R.E. Zhivago, D.A. Marshev

Title of the article: Features of transient processes in an underexcited high power synchronous motor

Year: 2023, Issue: 6, Pages: 3-9

Branch of knowledge: 2.4.2. Electrotechnical complexes and systems (engineering)

Index UDK: 621.313.323

DOI: 10.26730/1816-4528-2023-6-3-9

Abstract: High-power synchronous motors are widely used in various fields of industry, including mining and metallurgy - in electric drives of various mechanisms (lifting units, fans, pumps, compressors, rolling mill equipment, etc.). As is known, to minimize the reactive power consumed by a synchronous motor, the excitation current is selected in such a way that the operating point of the machine is located near the inflection point of the U-shaped characteristic. At the same time, the energy efficiency of the machine increases, however, transient processes in the engine (in particular, during asynchronous starting and when a load is applied) are quite “hard”, which is due to the damping effect of the magnetic field of the excitation winding and the damper winding at the specified operating position points. This problem is especially relevant for engines connected to the working body of the drive through elastic mechanical connections or through connections with gaps and backlashes, since in this case alternating forces, jerks and impacts occur in mechanical transmissions. In addition, the rigidity of the transient processes of the engine in this case complicates the balancing of loads in dynamic modes in a multi-motor drive. The article conducts a model study of transient processes in a powerful synchronous salient-pole motor under various conditions of its excitation and proposes to use the features of transient processes in an underexcited synchronous motor when regulating speed and torque and constructing load equalization systems.

Key words: synchronous motor U-shaped characteristic excitation current excitation transients

Receiving date: 31.10.2023

Approval date: 30.11.2023

Publication date: 21.12.2023

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