scholarly journals Online-Identification of Electromagnetic Parameters of an Induction Motor

2020 ◽  
Vol 63 (5) ◽  
pp. 423-440
Author(s):  
V. K. Tytiuk ◽  
M. L. Baranovskaya ◽  
O. P. Chorny ◽  
E. V. Burdilnaya ◽  
V. V. Kuznetsov ◽  
...  
Keyword(s):  
Equivalent Circuit ◽  
Induction Motor ◽  
Electric Drive ◽  
Frequency Control ◽  
Quality Parameters ◽  
Variable Frequency ◽  
Electromagnetic Parameters ◽  
Online Identification ◽  
Motor Operation ◽  
Induction Electric Drive

Incompliance of the settings of the system to control actual values of the parameters of a variable frequency induction electric drive may sometimes result in complete non-operability of a variable frequency electric drive as well as in the considerable reduction of the dynamic quality parameters. Such parameters as active rotor resistance, rotor inductance, and inductance of the magnetization circuit are available for the immediate measuring. They are not identified in terms of the acceptance tests, and the values presented in catalogues and reference books are calculated ones that may differ considerably from the real values of a certain machine. Despite constant studies by the researchers, a task to identify electromagnetic parameters of the equivalent circuit of an induction motor is still important and topical. The objective of the paper is to develop a method of online-identification of the electromagnetic parameters of an induction motor making it possible to implement accurate regulator adjustment of the frequency control system in terms of operational changes in the driving motor parameters. For the first time, the paper analyzes a steady mode of induction motor operation which does not apply T-network of the equivalent circuit of an induction motor. An approach has been proposed relying on the equation of an induction motor in three-phase fixed coordinate system obtained on the basis of the theory of generalized electromechanical converter. 

scholarly journals Energy saving system of cascade variable frequency induction electric drive

2019 ◽  
Vol 124 ◽  
pp. 01037 ◽  
Author(s):  
V. N. Meshcheryakov ◽  
D. V. Lastochkin ◽  
Z.M. Shakurova ◽  
S. Valtchev
Keyword(s):  
Energy Saving ◽  
Electric Drive ◽  
Block Diagram ◽  
Electrical Circuit ◽  
Variable Frequency ◽  
Variable Frequency Drive ◽  
Stator Current ◽  
Static Mechanical ◽  
Saving Mode ◽  
Induction Electric Drive

This paper discusses the wound rotor induction motor and variable-frequency drive (VFD) that regulates the stator voltage frequency. The stator and rotor windings are connected to a common electrical circuit. The slip energy of the motor goes to the DC link and feeds the stator winding of the motor. The block diagram of the electric drive, the equivalent circuit and the basic characteristic of the cascade VFD are considered. It is shown that the energy-saving mode with a minimum ratio “stator current/torque” is achieved at an angle between vectors of the stator current and the excitation current at the level of 45 degrees. The experimental static mechanical characteristics of the electric drive were obtained. These characteristics provide a limitation of the starting torque.

The Analysis of Inverter-Fed Induction Motors

1976 ◽  
Vol 13 (4) ◽  
pp. 359-369 ◽  
Author(s):  
Johnm. D. Murphy
Keyword(s):  
Equivalent Circuit ◽  
Induction Motor ◽  
Induction Motors ◽  
Electrical Machines ◽  
Transient Conditions ◽  
Motor Operation

Induction motor operation with a six-step inverter supply is analysed in a manner suitable for existing courses in electrical machines. Steady harmonic torques and harmonic losses are examined by the equivalent circuit approach. The two-axis model is used to determine instantaneous torque and current waveforms and to study transient conditions.

Improving Energy Efficiency of the Variable Frequency Drive of the Forced-Draught Fan with the Two-Speed Asynchronous Motor

2015 ◽  
Vol 792 ◽  
pp. 128-133 ◽  
Author(s):  
Ekaterina A. Khramshina ◽  
Alexander S. Karandaev ◽  
Rifkhat R. Khramshin
Keyword(s):  
Electric Drive ◽  
Frequency Control ◽  
Asynchronous Motor ◽  
Energy Performance ◽  
Hot Water ◽  
Control Mode ◽  
Variable Frequency ◽  
Variable Frequency Drive ◽  
Low Speed ◽  
Variable Frequency Control

Based on the example of forced-draught fans of the GOFHWB-100 series hot water boilers (gas and oil fired hot water boilers) power supply reserves of the electric drive with two-speed asynchronous motor have been determined. The structural chart of the developed control system of the electric drive with winding changeover depending on the boiler performance is provided. The paper considers power consumption of electric drive in the variable frequency speed control mode at the motor operation on the high and low speed windings. It presents methods for calculation of energy performance based on computing the equivalent efficiency of the fluid-handling application. The analysis of the efficiency change has proved that the variable frequency control enables electric power savings at the low speed winding by 5 to 6%. The results obtained are recommended to be widely applied at the change-over of the electric drives with two-speed asynchronous motors to the variable frequency control of performance.

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