RU145998U1 - Test diagram for asynchronous motors by their mutual load method - Google Patents

Test diagram for asynchronous motors by their mutual load method Download PDF

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Publication number
RU145998U1
RU145998U1 RU2014112920/07U RU2014112920U RU145998U1 RU 145998 U1 RU145998 U1 RU 145998U1 RU 2014112920/07 U RU2014112920/07 U RU 2014112920/07U RU 2014112920 U RU2014112920 U RU 2014112920U RU 145998 U1 RU145998 U1 RU 145998U1
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Russia
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powered
motors
same type
test
inverters
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RU2014112920/07U
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Russian (ru)
Inventor
Валерий Дмитриевич Авилов
Виктор Васильевич Харламов
Денис Игоревич Попов
Артём Валерьевич Литвинов
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Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования Омский государственный университет путей сообщения (ОмГУПС (ОмИИТ))
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Abstract

Test scheme of asynchronous electric motors by the method of their mutual load, consisting of an uncontrolled rectifier, powered by a three-phase network, two of the same type of controlled inverters, two of the same type of tested asynchronous motors, mechanically interconnected by means of a coupling and powered by controlled inverters, characterized in that for power two of the same type of inverters, one DC link is used, powered by one uncontrolled rectifier.

Description

The utility model relates to the field of electrical engineering and can be used as a test circuit for induction motors, providing mutual load of the tested machines and saving electric energy during testing by returning the electric energy generated by the load generator, and using it to power the loaded test motor.
Known test schemes for induction motors that implement a similar return of electrical energy generated by a load generator into the network, using additional electric machines in addition to the subjects. The disadvantage of these schemes is that in addition to losses in the tested machines, losses in additional machines are added to the circuit, and the cost of the test bench also increases [1, 2].
A known analogue consisting of two identical motors included in a common network, a frequency converter and two groups of contactors, each of which provides the ability to connect the corresponding motor to the network either directly or through a frequency converter, while the mechanical connection of the motor shafts is made by means of a coupling [3] .
The disadvantage of such a scheme is the impossibility of taking the mechanical characteristics of the motor at a constant frequency of the voltage supplied to its stator winding from the frequency converter, because To increase the load, the engine needs to increase the frequency of its supply voltage, higher than the mains frequency. The disadvantages include the need to use additional switching equipment and a decrease in the power factor of the test circuit consumed from the network due to the direct connection of the stator winding of the load machine to the network.
Another analogue is proposed in [4], and consisting of two tested asynchronous electric motors connected to the same frequency converters. In addition, each converter consists of rectifier blocks, DC links, controlled inverters, DC communication circuit and controlled brake module.
The disadvantage of this analogue is the redundancy of the equipment used: controlled brake modules, resistance blocks; two uncontrolled rectifiers that receive power from the same power source and convert electrical energy to power one DC system; two DC links.
The prototype of the proposed test circuit consists of two similar frequency converters, powered by a three-phase network, two similar tested asynchronous motors, mechanically connected by means of a coupling and powered by frequency converters. The frequency converters used in the test circuit consist of uncontrolled rectifiers, DC links and controlled inverters. The connection of frequency converters is realized using a DC bus connecting DC links of frequency converters [5, 6].
The disadvantage of this prototype is the redundancy of the equipment used: the use of two uncontrolled rectifiers that receive power from the same power source and convert electrical energy to power a single DC system, as well as the use of two similar DC links.
The purpose of the proposed utility model is to simplify the test scheme by eliminating excess elements, increasing its reliability and reducing cost.
This goal is achieved through the use in the circuit [5, 6] of one uncontrolled rectifier and a DC link instead of two, which will simplify the electrical test circuit and increase its reliability.
In FIG. 1 shows a proposed test design.
The test circuit consists of an uncontrolled rectifier 1, powered by a three-phase network, a DC link 2, two of the same type of controlled inverters 3, two of the same type of tested induction motors 4, a coupling 5, which mechanically connects the shafts of the motors 4, allowing their rotors to rotate with the same angular velocity around a common axis of rotation.
The output of the uncontrolled rectifier 1 is connected to the input of the DC link 2, the output of the DC link 2 is connected to the inputs of two of the same controlled inverters 3, the outputs of two of the same controlled inverters 3 are connected to the inputs (stator windings) of two of the same tested asynchronous motors 4, whose shafts are mechanically connected between each other through the coupling 5.
The scheme works as follows. The supplied three-phase voltage is fed to the input of an uncontrolled rectifier 1, where it is converted to a constant voltage. The constant voltage from the output of the uncontrolled rectifier 1 is transmitted to the input of the DC link 2. The constant voltage from the output of the DC link 2 is supplied to the input of the controlled inverter 3, where it is converted to alternating voltage of the required shape and frequency. The inverted voltage is then fed to the input (stator windings) of the induction motors 4. The shafts of the induction motors have a mechanical connection 5, due to which they rotate with the same angular frequency. To implement the mutual load mode, it is necessary, using a controlled inverter 3, to reduce the frequency of the supply voltage supplied to one of the asynchronous motors 4. An electric motor 4, which receives voltage from a controlled inverter 3 with a lower frequency, goes into the generator mode. The electric energy generated by the machine operating in the generator mode is supplied through the DC link 2 to power the machine operating in the engine mode 4. At the same time, the electric energy consumed from the network is necessary only to compensate for losses in the circuit.
Information sources:
1. Gervais, G.K. Industrial tests of electric machines / G.K. Gervais; Ed. 4th abbr. and reslave. - L .: Energoatomizdat. Leningra. Department, 1984-408 s, ill.
2. Patent for utility model R.F. No. 31068, IPC H02K 15/00, H02P 9/00, G01R 31/34, 2003.
3. Patent for utility model R.F. No. 80018, IPC G01R 31/04, 2008.
4. Patent for the invention of R.F. No. 2433419, IPC G01R 31/34, 2010.
5. Avilov, V.D. A mathematical model of the test process of induction motors by the method of their mutual load [Text] / V.D. Avilov, D.I. Popov, A.V. Litvinov // Bulletin of SibADI. 2013. No5 (33). S. 75-81.
6. Avilov, V.D. Assessment of energy efficiency of the application of the method of mutual load when testing asynchronous traction motors [Text] / V.D. Avilov, D.I. Popov, A.V. Litvinov // Proceedings of the Trans-Siberian Railway. - Omsk, 2013. - No. 3 (1). - S. 2-7.

Claims (1)

  1. Test scheme of asynchronous electric motors by the method of their mutual load, consisting of an uncontrolled rectifier, powered by a three-phase network, two of the same type of controlled inverters, two of the same type of tested asynchronous motors, mechanically interconnected by means of a coupling and powered by controlled inverters, characterized in that for power two of the same type of inverters, one DC link is used, powered by one uncontrolled rectifier.
    Figure 00000001
RU2014112920/07U 2014-04-02 2014-04-02 Test diagram for asynchronous motors by their mutual load method RU145998U1 (en)

Priority Applications (1)

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RU2014112920/07U RU145998U1 (en) 2014-04-02 2014-04-02 Test diagram for asynchronous motors by their mutual load method

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RU145998U1 true RU145998U1 (en) 2014-09-27

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU178657U1 (en) * 2017-12-11 2018-04-16 Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный университет путей сообщения" Test Scheme for Asynchronous Motors
RU186188U1 (en) * 2018-09-17 2019-01-11 Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный университет путей сообщения" Test bench for asynchronous machines

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU178657U1 (en) * 2017-12-11 2018-04-16 Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный университет путей сообщения" Test Scheme for Asynchronous Motors
RU186188U1 (en) * 2018-09-17 2019-01-11 Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный университет путей сообщения" Test bench for asynchronous machines

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MM1K Utility model has become invalid (non-payment of fees)

Effective date: 20150403