scholarly journals Equivalent structure of a double-fed induction motor with a change in frequency of additional voltage for electric drive systems of mine winders

2019 ◽  
Vol 377 ◽  
pp. 012041
Author(s):  
V Yu Ostrovlyanchik ◽  
I Yu Popolzin
Keyword(s):  
Induction Motor ◽  
Electric Drive ◽  
Equivalent Structure ◽  
Drive Systems

scholarly journals EVALUATION OF QUALITY INDICATORS OF MODERN CONTROL SYSTEMS OF DMZ WAGON TRANSMITTER DRIVE BY MATHEMATICAL MODELING

2021 ◽  
pp. 210-213
Author(s):  
Alexander Yudin ◽  
Vadim Nezhurin ◽  
Victor Kuvaiev
Keyword(s):  
Control System ◽  
Control Systems ◽  
Induction Motor ◽  
Quality Indicators ◽  
Electric Drive ◽  
Frequency Converter ◽  
Dc Motor ◽  
Thyristor Converter ◽  
Drive Systems ◽  
System Frequency

The results of the analysis of quality indicators of the proposed control systems for the electric drive of the DMZ ore yard with rheostatic tilt speed control, using alternative the system "thyristor converter - DC motor" and "frequency converter - induction motor", by studying the transients of these electric drive systems using the software product Matlab. It is established that the parameters of the control system "frequency converter - induction motor", are not inferior to the parameters of the control system "thyristor converter - DC motor", and even slightly exceed it, in particular, in the range of technological speeds of the wagon tipper drive, and energy losses during transient start-up processes are 2.3% less than the "thyristor converter - DC motor". It is expedient to use the offered decisions in case of modernization of the operating electric drive of the wagon tipper.

scholarly journals Accuracy Improvement of Stator Inductance Identification Method Based on Low-Frequency Current Injection for Three-Level NPC Inverter-Fed IM Drives in Locked-Rotor Standstill Condition

Electronics ◽  
2021 ◽  
Vol 10 (4) ◽  
pp. 488
Author(s):  
Yerganat Khojakhan ◽  
Kyoung-Min Choo ◽  
Junsin Yi ◽  
Chung-Yuen Won
Keyword(s):  
Induction Motor ◽  
Low Frequency ◽  
Current Injection ◽  
Heavy Load ◽  
Injection Test ◽  
Low Speed ◽  
Injection Speed ◽  
Speed Test ◽  
Identification Method ◽  
Drive Systems

In this paper, a stator inductance identification process is proposed. The process is based on a three-level neutral-point-clamped (NPC) inverter-fed induction motor (IM) drive with a standstill condition. Previously, a low-speed alternating current (AC) injection test for stator inductance identification was proposed to overcome practical problems in conventional identification methods for three-level NPC inverter-based IM drives. However, the low-speed AC injection test-based identification method has some problems if a heavy load or mechanical brake is connected, as these can forcibly bring the rotor to a standstill during parameter identification. Since this low-speed testing-based identification assumes the motor torque is considerably lower in low-speed operations, some inaccuracy is inevitable in this kind of standstill condition. In this paper, the proposed current injection speed generator is based on the previously studied low-speed test-based stator inductance identification method, but the proposed approach gives more accurate estimates under the aforementioned standstill conditions. The proposed method regulates the speed for sinusoidal low-frequency AC injection on the basis of the instantaneous reactive and air-gap active power ratio. This proposed stator inductance identification method is more accurate than conventional fixed low-frequency AC signal injection identification method for three-level NPC inverter-fed IM drive systems with a locked-rotor standstill condition. The proposed method’s accuracy and reliability were verified by simulation and experiment using an 18.5 kW induction motor.

Starting Processes in Electric Drive of a Passenger Elevator

2021 ◽  
Vol 1 (1) ◽  
pp. 40-49
Author(s):  
S. Rachev ◽  
K. Dimitrova ◽  
D. Koeva ◽  
L. Dimitrov
Keyword(s):  
Coordinate System ◽  
Induction Motor ◽  
Electric Drive ◽  
High Speed ◽  
Induction Motors ◽  
Dynamic Loads ◽  
Design Stage ◽  
Motor Drive ◽  
Induction Motor Drive ◽  
Electric Induction

During the operation of electric induction motors used to drive passenger elevators, electro-mechanical transient processes occur, which can cause unacceptable dynamic loads and vibrations. In this regard, research is needed both at the design stage and for operating elevator systems to determine the arising impact currents and torques, in order to propose solutions for their limitation within pre-set limits. Paper deals with starting processes in a two-speed induction motor drive of a passenger elevator. The equations for the voltages of the induction motor are presented in relative units in a coordinate system rotating at a synchronous speed. The values have been obtained for the torques, the rotational frequencies and the currents when starting at a high speed and passing from high to low speed.

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