RU178539U1 - Test bench for asynchronous machines and DC machines with parallel (independent) excitation - Google Patents

Test bench for asynchronous machines and DC machines with parallel (independent) excitation Download PDF

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Publication number
RU178539U1
RU178539U1 RU2017143233U RU2017143233U RU178539U1 RU 178539 U1 RU178539 U1 RU 178539U1 RU 2017143233 U RU2017143233 U RU 2017143233U RU 2017143233 U RU2017143233 U RU 2017143233U RU 178539 U1 RU178539 U1 RU 178539U1
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Russia
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output
machines
load
uncontrolled
contactor
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RU2017143233U
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Russian (ru)
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Виктор Васильевич Харламов
Денис Игоревич Попов
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Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный университет путей сообщения"
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34Testing dynamo-electric machines

Abstract

The utility model relates to tests of asynchronous machines and DC machines with parallel (independent) excitation by the mutual load method. Effect: increased reliability. Essence: the stand consists of two uncontrolled rectifiers, two DC links electrically connected to each other, the inputs of which are connected to the outputs of uncontrolled rectifiers, two of the same type of controlled inverters, the inputs of which are connected to the outputs of the DC links, a coupling mechanically connecting the shafts of the test and asynchronous load machines, couplings, mechanically connecting the shafts of the test and load DC machines, a third uncontrolled rectifier and four contactors . The stator winding of the tested asynchronous machine is connected to the output of one controlled inverter through the first contactor, the stator winding of the load asynchronous machine is connected to the output of another controlled inverter through the second contactor. The input of the third uncontrolled rectifier is connected to the output of one controlled inverter through the third contactor, and the output is connected to the anchor circuits of the tested and load DC machines. The input of the fourth uncontrolled rectifier is connected to the output of the second controlled inverter through the fourth contactor. The field winding of the tested DC machine is connected to the output of a third uncontrolled rectifier. The excitation winding of the DC loading machine is connected to the output of the fourth uncontrolled rectifier. 1 ill.

Description

The utility model relates to the field of electrical engineering and can be used as a stand for testing asynchronous machines and DC machines with parallel (independent) excitation.
An analogue of the proposed device is a mutual load circuit of DC machines, in which one power unit feeds the armature chains of the test and load machines, and the other performs the function of a booster source that changes the voltage at the armature of one machine relative to another, due to which one of the machines becomes a motor mode, and the other - in the generator [1].
Another analogue of the proposed device is a test circuit of induction motors by the method of their mutual load (RU 140678 U1, 05/20/2014) [2], which consists of two similar frequency converters, powered by a three-phase network, two similar type tested asynchronous motors, mechanically interconnected 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 the DC links of frequency converters.
The disadvantage of analogues is the limited scope: the ability to test only DC motors or only AC motors. If it is necessary to test both types of engines at one enterprise, the use of the given analogues doubles the number of controllable power converters and their control systems.
The prototype of the proposed device is a test bench for induction motors and DC motors with parallel (independent) excitation, consisting of two uncontrolled rectifiers powered by a three-phase network, two DC links electrically connected to each other, the inputs of which are connected to the outputs of uncontrolled rectifiers, two of the same type of controlled inverters, the inputs of which are connected to the outputs of the DC links, a coupling that mechanically connects the tested asyn rotary engines equipped with a third uncontrolled rectifier, booster converter, four contactors, a coupling mechanically connecting the test and load DC motors, a DC voltage conversion unit, the input of which is connected to the DC links, and the output is connected to the excitation windings of the test and load motors direct current; the stator winding of the tested induction motor is connected to the output of one controlled inverter through the first contactor, the stator winding of the load induction motor is connected to the output of another controlled inverter through the second contactor, the input of the third uncontrolled rectifier is connected to the output of one controlled inverter through the third contactor, and the output is connected to the armature circuits of the tested and load DC motors, the input of the boost converter is connected to the output of another controllably th inverter through the fourth contactor, and the output is connected in series with the armature winding of the load DC motor. This device allows you to unify the stands for testing induction motors and DC motors with parallel (independent) excitation by the mutual load method.
The disadvantage of the prototype is the design complexity and, as a consequence, the low reliability of the system.
The purpose of the utility model is to increase the reliability of the stand by improving the circuit and the list of converters used in it.
This goal is achieved by the fact that the test bench for asynchronous machines and DC machines with parallel (independent) excitation, consisting of two uncontrolled rectifiers, powered by a three-phase network, two DC links electrically connected to each other, the inputs of which are connected to the outputs of uncontrolled rectifiers, two of the same type of controlled inverters, the inputs of which are connected to the outputs of the DC links, a coupling that mechanically connects the shafts of the test and load asynchronous machines, a coupling, mechanically connecting the shafts of the tested and load DC machines, a third uncontrolled rectifier and four contactors; the stator winding of the tested asynchronous machine is connected to the output of one controlled inverter through the first contactor, the stator winding of the load asynchronous machine is connected to the output of another controlled inverter through the second contactor, the input of the third uncontrolled rectifier is connected to the output of one controlled inverter through the third contactor, and the output is connected to anchor circuits of the tested and load DC machines; equipped with a fourth uncontrolled rectifier, the input of which is connected to the output of the second controlled inverter through the fourth contactor, the excitation winding of the tested DC machine is connected to the output of the third uncontrolled rectifier, the excitation winding of the load DC machine is connected to the output of the fourth uncontrolled rectifier.
In FIG. The stand for testing asynchronous machines and DC machines with parallel (independent) excitation is presented.
The proposed device consists of two identical frequency converters 1 and 2, powered by a three-phase network, which consist of uncontrolled rectifiers 1.1 and 2.1, DC links 1.2 and 2.2, controlled inverters 1.3 and 2.3. DC links 1.2 and 2.2 are electrically connected to each other 3. Clutch 10 mechanically couples the shafts of asynchronous machines 8 and 9, powered by frequency converters 1 and 2 through contactors 5 and 6. Coupling 15 mechanically couples the shafts of machines DC 13 and 14, the armature windings of which 13.1 and 13.2 and the excitation winding 13.2 are connected to the output of an uncontrolled rectifier 11 connected to the frequency converter 1 through contactor 4. The excitation winding 14.2 of the DC machine 14 is connected to the uncontrolled output th rectifier 12 connected to the inverter 1 through the contactor 7.
The inputs of both unmanaged rectifiers 1.1 and 2.1 are connected to a three-phase network. The output of the uncontrolled rectifier 1.1 is connected to the input of the DC link 1.2, the output of the uncontrolled rectifier 2.1 is connected to the input of the DC link 2.2. The input of the controlled inverter 1.3 is connected to the output of the DC link 1.2. The input of the controlled inverter 2.3 is connected to the output of the DC link 2.2. The outputs of the DC link 1.2 and 2.2 are connected to each other by an electrical connection 3. The stator windings of asynchronous machines 8 and 9, the shafts of which are mechanically connected to each other by a coupling 10, are connected through the contactors 5 and 6 to the inputs of the controlled inverters 1.3 and 2.3. The input of an uncontrolled rectifier 11 is connected through a contactor 4 to the output of a controlled inverter 1.3. The input of an uncontrolled rectifier 12 is connected through a contactor 7 to the output of a controlled inverter 2.3. The ends of the armature windings 13.1 and 14.1 of the DC machines 13 and 14, the shafts of which are mechanically connected to each other by the coupling 15, are connected to the output of the uncontrolled rectifier 11. The field winding 13.2 of the DC machine 13 is connected to the output of the uncontrolled rectifier 11. The field winding 14.2 of the DC machine 14 connected to the output of an uncontrolled rectifier 12.
The device operates as follows. The three-phase voltage supplied from the network is supplied to frequency converters 1 and 2, where it is converted to direct voltage by means of rectifiers 1.1 and 2.1, transferred to DC links 1.2 and 2.2 and then inverted using controlled inverters 1.3 and 2.3 to alternating voltage having the required effective current value and frequency.
When testing asynchronous machines 8 and 9, their stator windings are connected to the outputs of controlled inverters 1.3 and 2.3 through contactors 5 and 6. At the same time, contactors 4 and 7 are disconnected. To implement the mutual load mode, it is necessary to reduce the frequency of rotation of the magnetic field on one of the asynchronous machines (for example, on the asynchronous machine 8) in comparison with the shaft rotation frequency. To do this, having accelerated asynchronous machines 8 and 9 idling to a certain speed, it is necessary to reduce the frequency of the generated voltage at the frequency converter 1. Asynchronous machine 8, which receives voltage from the converter 1 with a lower frequency, goes into the generator mode, and the electric energy generated by it enters the DC link 1.2 and then through the electrical connection 3 enters the DC link 2.2 of the frequency converter 2, which provides power to the electric machine 9, work boiling in the motoring mode.
When testing DC machines with parallel (independent) excitation, an uncontrolled rectifier 11 is connected through a contactor 4 to a frequency converter 1, and an uncontrolled rectifier 12 is connected through a contactor 7 to a frequency converter 2. In this case, the contactors 5 and 6 are disconnected. The excitation winding 13.2 of the DC machine 13 receives power from an uncontrolled rectifier 11, and the excitation winding 14.2 of a direct current machine 14 receives power from an uncontrolled rectifier 12. The constant voltage supplied to the armature circuits of motors 13 and 14 from the output of an uncontrolled rectifier 11 is determined by the parameters of the alternating voltage at its input, which, in turn, is controlled using the frequency converter 1. To implement the load mode, you must first disperse DC machines 13 and 14 to idling, gradually raising the voltage on their windings to the nominal value using frequency converters 1 and 2. Next, using frequency converter 2, it is necessary to reduce the voltage at the output of the uncontrolled rectifier 12 and thereby weaken the excitation of the DC machine 14. When the excitation is weakened, the electromotive force will decrease the armature windings 14.1 and the DC machine 14 will go into engine mode, and the DC machine 14 will go into generator mode. The degree of attenuation of the excitation of the DC machine 14 will determine the magnitude of its load in the motor mode.
Information sources:
1. Gervais, G.K. Industrial tests of electric machines / G.K. Gervais; Ed. 4th abbr. and reslave. - L .: Energoatomizdat. Leningra. Otdel, 1984. - 408 p.
2. Patent for utility model R.F. No. 140678, IPC G01R 31/34, 2014.
3. Patent for utility model R.F. No. 170708, IPC G01R 31/34, 2017.

Claims (1)

  1. Test bench for asynchronous machines and DC machines with parallel (independent) excitation, consisting of two uncontrolled rectifiers powered by a three-phase network, two DC links electrically connected to each other, the inputs of which are connected to the outputs of uncontrolled rectifiers, two of the same type of controlled inverters the inputs of which are connected to the outputs of the DC links, the coupling, mechanically connecting the shafts of the test and load asynchronous machines, the coupling, mechanically connected coaxing the shafts of the tested and load DC machines, a third uncontrolled rectifier and four contactors; the stator winding of the tested asynchronous machine is connected to the output of one controlled inverter through the first contactor, the stator winding of the load asynchronous machine is connected to the output of another controlled inverter through the second contactor, the input of the third uncontrolled rectifier is connected to the output of one controlled inverter through the third contactor, and the output is connected to anchor circuits of the tested and load DC machines, characterized in that it is supplemented by a fourth uncontrolled rectifier, the input of which is sub it is connected to the output of the second controlled inverter through the fourth contactor, the excitation winding of the tested DC machine is connected to the output of the third uncontrolled rectifier, the excitation winding of the load DC machine is connected to the output of the fourth uncontrolled rectifier.
RU2017143233U 2017-12-11 2017-12-11 Test bench for asynchronous machines and DC machines with parallel (independent) excitation RU178539U1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU184839U1 (en) * 2018-07-17 2018-11-12 Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный университет путей сообщения" Test bench for asynchronous machines and DC machines
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

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19608126A1 (en) * 1996-03-02 1997-09-11 Cegelec Aeg Anlagen Und Automa Testing unit for testing DC series motors or generators
CN202102089U (en) * 2011-05-17 2012-01-04 中国电力科学研究院 Motor efficiency detection system device
RU149678U1 (en) * 2014-09-30 2015-01-20 Общество с ограниченной ответственностью "Московский завод "ФИЗПРИБОР" Power supply gn-20a-15 basic cabinet unified complex of technical means
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19608126A1 (en) * 1996-03-02 1997-09-11 Cegelec Aeg Anlagen Und Automa Testing unit for testing DC series motors or generators
CN202102089U (en) * 2011-05-17 2012-01-04 中国电力科学研究院 Motor efficiency detection system device
RU149678U1 (en) * 2014-09-30 2015-01-20 Общество с ограниченной ответственностью "Московский завод "ФИЗПРИБОР" Power supply gn-20a-15 basic cabinet unified complex of technical means
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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU184839U1 (en) * 2018-07-17 2018-11-12 Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный университет путей сообщения" Test bench for asynchronous machines and DC machines
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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MM9K Utility model has become invalid (non-payment of fees)

Effective date: 20181212