RU184839U1 - Test bench for asynchronous machines and DC machines - Google Patents

Test bench for asynchronous machines and DC machines Download PDF

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Publication number
RU184839U1
RU184839U1 RU2018126407U RU2018126407U RU184839U1 RU 184839 U1 RU184839 U1 RU 184839U1 RU 2018126407 U RU2018126407 U RU 2018126407U RU 2018126407 U RU2018126407 U RU 2018126407U RU 184839 U1 RU184839 U1 RU 184839U1
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Russia
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output
machine
terminal
winding
machines
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RU2018126407U
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Russian (ru)
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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 the field of electrical engineering and can be used as a test bench for asynchronous machines and DC machines using the mutual load method. Effect: expanding the functionality of the stand. Essence: the device is equipped with a switch having two operating positions. When testing DC machines with series excitation, the switch is turned on in the first operating position. When testing DC machines with parallel excitation, the switch is turned on in the second operating position. 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.
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].
The disadvantage of this analogue is the limited scope: the lack of the ability to test on the stand of AC machines and DC machines with independent (parallel) excitation.
Another analogue of the proposed device is a test bench for induction motors and DC motors with series excitation (RU 168633 U1, 02.13.2017) [2], which consists of two uncontrolled rectifiers, powered by a three-phase network, two DC links, electrically connected interconnected, the inputs of which are connected to the outputs of uncontrolled rectifiers, of the same type of controlled inverters, the inputs of which are connected to the outputs of the DC links, a coupling mechanically connecting between themselves th test asynchronous motors, the third uncontrolled rectifier boost converter, four contactors, coupling mechanically linking between a test and a load DC motors; 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.
The disadvantage of this analogue is its limited scope: the lack of the ability to test DC machines with independent (parallel) excitation on a bench.
The prototype of the proposed device is a test bench for asynchronous 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 second asynchronous machines, coupling mechanically linking together shafts of the test and the load of DC machines 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; the 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.
The disadvantage of the prototype is the limited scope: the lack of testing at the stand of DC machines with sequential excitation.
The purpose of the utility model is to expand the functional capabilities of the stand: obtaining the possibility of testing on the stand asynchronous machines, DC machines with independent (parallel) excitation and DC machines with sequential excitation.
This goal is achieved by the fact that the test bench for asynchronous and DC machines, 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 connecting between themselves the shafts of the tested and load DC machines, the third and fourth uncontrolled rectifiers 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 the second 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, the input of the fourth uncontrolled rectifier connected to the output of the second controlled inverter through the fourth contactor, equipped with a switch having two working positions niya; in the first working position of the switch, the first terminal of the field winding of the first DC machine is connected to the first terminal of the field of the second DC machine, the second terminal of the field of the first DC machine is connected to the first terminal of its armature winding, the second terminal of the armature coil of the first DC machine and the first the output of the armature winding of the second DC machine is connected to the second output of the third uncontrolled rectifier, the second output of the armature winding of the second DC machine the current is connected to the first terminal of the fourth uncontrolled rectifier, the first terminal of the third uncontrolled rectifier and the second terminal of the field winding of the second DC machine are connected to the second terminal of the fourth uncontrolled rectifier; in the second operating position of the switch, the first output of the excitation winding of the first DC machine is connected to the first output of the third uncontrolled rectifier, the second output of the excitation winding of the first DC machine is connected to the second output of the third uncontrolled rectifier, the first output of the armature winding of the first DC machine is connected to the first output of the third uncontrolled rectifier, the second output of the armature winding of the first DC machine is connected to the second output of the third uncontrollable controlled rectifier, the first output of the armature winding of the second DC machine is connected to the first output of the third uncontrolled rectifier, the second output of the armature of the second DC machine is connected to the second output of the third uncontrolled rectifier, the first output of the field winding of the second DC machine is connected to the first output of the fourth uncontrolled rectifier , the second terminal of the field winding of the second DC machine is connected to the second terminal of the fourth uncontrolled rectifier of Tell.
In FIG. The stand for testing asynchronous machines and DC machines 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 16 mechanically couples the shafts of machines DC 14 and 15, the armature windings of which 14.1 and 15.1 and the field windings 14.2 and 15.2 are connected through the switch 13 with the outputs of uncontrolled rectifiers 11 and 12. Uncontrolled rectifiers 11 and 12 are powered by frequency converters 1 and 2 through contactors 4 and 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 links 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 shafts of the DC machines 14 and 15 are mechanically connected to each other by a clutch 16. Each of the ends of the armature windings 14.1 and 15.1 and the field windings 14.2 and 15.2 is connected to a separate movable contact of the switch 13. In the first working position of the switch 13, the first output of the field winding 14.2 of the first DC machine current 14 is connected to the first terminal of the field winding 15.2 of the second DC machine 15, the second terminal of the field coil 14.2 of the first DC machine 14 is connected to the first terminal of its armature winding 14.1, the second terminal of the winding Korya 14.1 of the first DC machine 14 and the first output of the armature winding 15.1 of the second DC machine 15 are connected to the second output of the third uncontrolled rectifier 11, the second output of the armature coil 15.1 of the second DC machine 15 is connected to the first output of the fourth uncontrolled rectifier 12, the first output of the third uncontrolled rectifier 11 and the second terminal of the field winding 15.2 of the second DC machine are connected to the second terminal of the fourth uncontrolled rectifier 12; in the second operating position of the switch 13, the first terminal of the field winding 14.2 of the first DC machine 14 is connected to the first terminal of the third uncontrolled rectifier 11, the second terminal of the field coil 14.2 of the first DC machine 14 is connected to the second terminal of the third uncontrolled rectifier 11, the first terminal of the armature winding 14.1 of the first DC machine 14 is connected to the first output of the third uncontrolled rectifier 11, the second output of the armature winding 14.1 of the first DC machine 14 is connected to the second the output of the third uncontrolled rectifier 11, the first output of the armature coil 15.1 of the second DC machine 15 is connected to the first output of the third uncontrolled rectifier 11, the second output of the armature coil 15.1 of the second DC machine 15 is connected to the second output of the third uncontrolled rectifier 11, the first output of the excitation coil 15.2 second DC machine 15 is connected to the first terminal of the fourth uncontrolled rectifier 12, the second terminal of the field winding 15.2 of the second DC machine 15 is connected to oromu terminal of the fourth 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 speed. To do this, having driven asynchronous machines 8 and 9 idling to a certain speed, it is necessary to reduce the frequency of the generated voltage on 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, working th in the motoring mode.
When testing DC machines, 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.
When testing DC machines with series excitation, the switch 13 is included in the first operating position. In this case, both field windings 14.2 and 15.2 are connected in series with the armature winding 14.1. The constant voltage supplied to the anchor circuits of DC machines 14 and 15 from the output of an uncontrolled rectifier 11 is determined by the parameters of the alternating voltage at its input, which, in turn, is regulated using the frequency converter 1. To implement the mutual load mode, it is necessary to increase the voltage in the anchor the circuit of one DC machine compared to another due to the voltage supplied from the output of the uncontrolled rectifier 12, which in this case acts as a boost booster converter. In this case, the DC machine, in the anchor circuit of which the voltage turned out to be higher, is loaded in the motor mode, and the other DC machine goes into the generator mode. The constant voltage at the output of the boost converter 12 is determined by the parameters of the alternating voltage at its input, which, in turn, is controlled by the frequency converter 2.
When testing DC machines with parallel (independent) excitation, the switch 13 is included in the second operating position. In this case, the field winding 14.2 of the DC machine 14 receives power from an uncontrolled rectifier 11, and the field coil 15.2 of the DC machine 15 receives power from an uncontrolled rectifier 12. The constant voltage supplied to the armature circuits of the motors 14 and 15 from the output of the uncontrolled rectifier 11 is determined by the parameters AC voltage at its input, which, in turn, is regulated using a frequency converter 1. To implement the load mode, you must first disperse DC machines 14 15 at idle, smoothly raising the voltage on their windings to the nominal value using frequency converters 1 and 2. Next, using the 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 15. When the excitation decreases the electromotive force of the armature winding 15.1 and the DC machine 15 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 15 will determine the magnitude of the load power of both electric DC machines 14 and 15.
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 p.
2. Patent for utility model R.F. No. 168633, IPC G01R 31/34, G01M 15/00, 2016.
3. Patent for utility model R.F. No. 178539, IPC G01R 31/34, 2017.

Claims (1)

  1. Test bench for asynchronous and DC machines, 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 DC links, a coupling mechanically connecting the shafts of the test and load asynchronous machines, a coupling mechanically connecting the shafts of the test and load part-time DC machines, the third and fourth uncontrolled rectifiers 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 the second 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, the input of the fourth uncontrolled rectifier connected to the output of the second controlled inverter through the fourth contactor, characterized in that it is supplemented by a switch having conductive two working positions; in the first working position of the switch, the first terminal of the field winding of the first DC machine is connected to the first terminal of the field of the second DC machine, the second terminal of the field of the first DC machine is connected to the first terminal of its armature winding, the second terminal of the armature coil of the first DC machine and the first the output of the armature winding of the second DC machine is connected to the second output of the third uncontrolled rectifier, the second output of the armature winding of the second DC machine current is connected to the first terminal of the fourth uncontrolled rectifier, the first terminal of the third uncontrolled rectifier and the second terminal of the field winding of the second DC machine are connected to the second terminal of the fourth uncontrolled rectifier; in the second operating position of the switch, the first output of the excitation winding of the first DC machine is connected to the first output of the third uncontrolled rectifier, the second output of the excitation winding of the first DC machine is connected to the second output of the third uncontrolled rectifier, the first output of the armature winding of the first DC machine is connected to the first output of the third uncontrolled rectifier, the second output of the armature winding of the first DC machine is connected to the second output of the third uncontrollable controlled rectifier, the first output of the armature winding of the second DC machine is connected to the first output of the third uncontrolled rectifier, the second output of the armature of the second DC machine is connected to the second output of the third uncontrolled rectifier, the first output of the field winding of the second DC machine is connected to the first output of the fourth uncontrolled rectifier , the second terminal of the field winding of the second DC machine is connected to the second terminal of the fourth uncontrolled rectifier of Tell.
RU2018126407U 2018-07-17 2018-07-17 Test bench for asynchronous machines and DC machines RU184839U1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102520354A (en) * 2011-12-19 2012-06-27 湖南工业大学 Asynchronous motor test system based on labview platform
RU156788U1 (en) * 2015-06-11 2015-11-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Московский государственный университет путей сообщения" МГУПС (МИИТ) Device for bench tests of asynchronous traction engines
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
RU178539U1 (en) * 2017-12-11 2018-04-06 Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный университет путей сообщения" Test bench for asynchronous machines and DC machines with parallel (independent) excitation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102520354A (en) * 2011-12-19 2012-06-27 湖南工业大学 Asynchronous motor test system based on labview platform
RU156788U1 (en) * 2015-06-11 2015-11-20 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Московский государственный университет путей сообщения" МГУПС (МИИТ) Device for bench tests of asynchronous traction engines
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
RU178539U1 (en) * 2017-12-11 2018-04-06 Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный университет путей сообщения" Test bench for asynchronous machines and DC machines with parallel (independent) excitation

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Effective date: 20190718