RU140678U1 - 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
RU140678U1
RU140678U1 RU2013147519/28U RU2013147519U RU140678U1 RU 140678 U1 RU140678 U1 RU 140678U1 RU 2013147519/28 U RU2013147519/28 U RU 2013147519/28U RU 2013147519 U RU2013147519 U RU 2013147519U RU 140678 U1 RU140678 U1 RU 140678U1
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Russia
Prior art keywords
test
mutual load
motors
frequency
asynchronous motors
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RU2013147519/28U
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Russian (ru)
Inventor
Валерий Дмитриевич Авилов
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 induction motors by the method of their mutual load, characterized in that these motors are mechanically interconnected and each of them is connected to the same type of frequency converters with DC links connected by a common bus, while the converters are connected to a three-phase network.

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 electrical energy when testing them.
At present, test circuits of induction motors are known that realize the return of electric energy to or from the network to the tested motor.
So one of the circuits that ensure the return of electric energy consists of two AC machines, one of which is an asynchronous machine. Both AC machines are connected to the network and each of them is mechanically connected to DC machines, which are electrically interconnected [1].
Another scheme that provides the return of electric energy consists of a test engine, a loading machine, an assembly, which includes a racing engine, a synchronous generator, a dual-power machine, a converter [2].
The disadvantage of these schemes is the need to use additional electrical machines.
A utility model is known, consisting of two identical motors included in a common network, and mechanically connected to each other, a frequency converter and two groups of contactors, each of the groups of contactors provides the ability to connect the corresponding motor to the network either directly or through a frequency converter, while mechanical coupling of motor shafts is made by means of a coupling [3].
The above scheme implements the mutual load mode of the tested asynchronous machines. The disadvantages of this scheme include: the need to use additional switching equipment; the operation of the machine, which goes into generator mode, directly to the network; the mutual load mode is implemented when the supply voltage is applied with a frequency higher than the mains frequency, which limits the range of load control.
The prototype of the proposed utility model is the circuit proposed in [4], and consisting of two tested asynchronous electric motors connected to the same type of frequency converters. In addition, each converter consists of rectifier blocks, DC links, controlled inverters, DC communication circuit and controlled brake module.
The disadvantage of the described device is the redundancy of the equipment used: controlled brake modules, resistance blocks. The purpose of the brake modules and resistance blocks is to suppress the excess energy that accumulates in the DC link during engine braking. When implementing the mutual load method according to the proposed scheme, the electric energy generated by the generator is transmitted to the test engine through the electrical connection of DC links, so there is no need to use such equipment. The presence of this equipment leads to additional power losses in the circuit, the complexity of the control system, as well as a general decrease in the reliability of the circuit.
The purpose of the proposed utility model is to simplify the test circuit and, as a result, the test process of induction motors while maintaining high energy efficiency.
This goal is achieved by eliminating controlled brake modules and resistance blocks from the test circuit. The possibility of implementing the mutual load mode when testing induction motors is possible without the use of braking resistors and modules. The findings were fully confirmed experimentally [5].
In FIG. 1 shows a proposed test design.
The test circuit consists of two identical frequency inverters 1, powered by a three-phase network, two of the same type of tested induction motors 6, mechanically interconnected via a coupling 7 and powered by frequency inverters 1. Frequency converters 1 used in the test scheme consist of uncontrolled rectifiers 2, DC links 3 and controlled inverters 4. Communication frequency converters 1 is implemented using a DC bus 5, connecting DC links 3 hours total converters 1.
The scheme works as follows. The supplied three-phase voltage is supplied to uncontrolled rectifiers 2, where it is converted to direct voltage, inverted using controlled inverters 4 into alternating voltage, the required amplitude and frequency and supplied to power the tested asynchronous motors 6. To implement the mutual load mode, it is necessary to reduce the frequency of rotation of the magnetic field on one of the asynchronous motors 6 in comparison with the shaft speed: by speeding the 6 engines idling to a certain speed, reduce the hour Totu of the supply voltage at one of the frequency converters 1. The electric motor 6, receiving voltage from the converter 1 with a lower frequency, goes into the generator mode. The electric energy generated by the generator 6 enters the DC link 3 of the frequency converter 1 supplying the generator 6, and then through the DC bus 5 enters the DC link 3 of the frequency converter 1, which supplies power to the test motor 6.
The testing of this circuit was performed on a physical model using ADM71V4U2 induction motors, 750 W, 2p = 4, n n = 1350 rpm [5]. At the same time, to realize the mutual load mode, in which one of the engines goes into the generator mode, it was enough to reduce the frequency of the supply voltage by only 1 Hz. Thus, the proposed test scheme implements the mutual load mode without the use of additional resistance blocks.
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 G01R 31/34, 2010.
5. Avilov, V.D. A physical model of a test station for asynchronous traction motors using the mutual load method / V.D. Avilov, V.T. Dankovtsev, D.I. Popov, A.V. Litvinov // Innovative projects and new technologies for the transport complex. The fourth scientific and practical conference dedicated to the Day of Russian Science and the 110th anniversary of Omsk State Transport University (February 8, 2012) / Omsk State. un-t of communication lines. Omsk, 2012.S. 69-73.

Claims (1)

  1. Test scheme of induction motors by the method of their mutual load, characterized in that these motors are mechanically interconnected and each of them is connected to the same type of frequency converters with DC links connected by a common bus, while the converters are connected to a three-phase network.
    Figure 00000001
RU2013147519/28U 2013-10-24 2013-10-24 Test diagram for asynchronous motors by their mutual load method RU140678U1 (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU168633U1 (en) * 2016-10-10 2017-02-13 Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный университет путей сообщения" Stand for testing asynchronous motors and dc motors with sequential excitation
RU170708U1 (en) * 2016-10-10 2017-05-03 Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный университет путей сообщения" Stand for testing asynchronous motors and dc motors with parallel (independent) excitation
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
RU178716U1 (en) * 2017-12-11 2018-04-17 Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный университет путей сообщения" Test bench for induction motors by mutual load method
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
RU2706449C1 (en) * 2019-03-21 2019-11-19 Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный университет путей сообщения" Method for testing asynchronous engines by mutual load

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU168633U1 (en) * 2016-10-10 2017-02-13 Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный университет путей сообщения" Stand for testing asynchronous motors and dc motors with sequential excitation
RU170708U1 (en) * 2016-10-10 2017-05-03 Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный университет путей сообщения" Stand for testing asynchronous motors and dc motors with parallel (independent) excitation
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
RU178716U1 (en) * 2017-12-11 2018-04-17 Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный университет путей сообщения" Test bench for induction motors by mutual load method
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
RU2706449C1 (en) * 2019-03-21 2019-11-19 Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный университет путей сообщения" Method for testing asynchronous engines by mutual load

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

Effective date: 20141025