RU197440U1 - Mutual load test scheme of asynchronous machines - Google Patents

Mutual load test scheme of asynchronous machines Download PDF

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Publication number
RU197440U1
RU197440U1 RU2020104611U RU2020104611U RU197440U1 RU 197440 U1 RU197440 U1 RU 197440U1 RU 2020104611 U RU2020104611 U RU 2020104611U RU 2020104611 U RU2020104611 U RU 2020104611U RU 197440 U1 RU197440 U1 RU 197440U1
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output
input
control
asynchronous machines
controlled
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RU2020104611U
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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 the field of electrical engineering and can be used as a test circuit for asynchronous machines. EFFECT: increased reliability of the test circuit of asynchronous machines by the method of mutual load by preventing the possibility of overloading them by controlling the electric power of both machines taking into account possible phase asymmetry, as well as improving the accuracy of determining the controlled values of electric power while ensuring ease of measurement. Essence: the circuit of testing asynchronous machines by the method of mutual load is supplemented by a voltage sensor, the input of which is connected to DC links, and the output is connected to the input of the control system, an indicator, the input of which is connected to the output of the control system. The output of the first DC link is connected to the power input of the first controlled inverter through the first current sensor, the output of the second DC link is connected to the power input of the second controlled inverter through the second current sensor. 1 ill.

Description

The utility model relates to the field of electrical engineering and can be used as a test circuit of asynchronous machines by the method of mutual load.
An analogue of the proposed utility model is a test circuit of asynchronous motors by the method of their mutual load, characterized in that these electric 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 ( RU 140678 U1, 05.20.2014) [1]. This test scheme allows you to reduce the cost of electricity when testing induction motors due to the implementation of the mutual load method.
The disadvantage of this analogue is manual control and, as a result, the possibility of overloads in the circuit during the output of the tested machine to the load mode, as well as the lack of means for measuring and controlling the electric power of the tested motor and the loading machine.
Another analogue of the proposed utility model is a circuit for determining the electric power consumed by induction motors when testing them using the mutual load method, characterized in that common industrial electrical measuring instruments are used as measuring instruments for measuring AC power with a frequency of 50 Hz supplied to the inputs of both frequency converters and one of the asynchronous motors, and DC power transmitted via a common DC bus; the use of two contactors, allowing to de-energize the input of the rectifier of one of the frequency converters (RU 143346 U1, 06/19/2014) [2]. This mutual load scheme allows you to indirectly determine the values of the power consumed by the tested motor and generated by the loading machine through the use of previously removed dependences on the load losses in static converters.
The disadvantages of this analogue are the difficulty in determining the electrical power of the engine and the loading machine, due to the need for a large number of preliminary measurements and their mathematical processing, as well as the presence of a relatively large total error in determining the powers of the measurement error at the input of the circuit, errors due to the approximation of the dependences of losses in rectifiers and controlled inverters from load and measurement errors in various circuit elements are power required to obtain approximation data.
The prototype of the proposed utility model is a test circuit of induction motors by the method of their mutual load, consisting of two uncontrolled rectifiers, powered by a three-phase network, two DC links electrically connected between each other, the inputs of which are connected to the outputs of uncontrolled rectifiers, two of the same type of controlled inverters, inputs which are connected to the outputs of the DC links, a coupling that mechanically connects the tested asynchronous motors receiving power e from controlled inverters, equipped with a control system, the outputs of which are connected to the inputs of the controlled inverters, and the inputs of which are connected to the outputs of the following devices: two current sensors, the inputs of which are connected to the outputs of the controlled inverters, a speed sensor connected to the rotors of the tested asynchronous motors, two calculators the frequency of the supply voltage, the inputs of which are connected to the outputs of the controlled inverters, and the setpoint parameters of the network and the tested induction motors (RU 163996 U1.20.08.2016) [3].
The disadvantage of the prototype is the possibility of overloads in the circuit during the output of the tested machine to the load mode, due to the possibility of incorrect operation of the control system due to current control only on one of the phases of the stator of the machines. This scheme does not take into account the possibility of current asymmetry in the phases of the stator windings, which may be due to a malfunction of asynchronous machines, which leads to a difference in the parameters of the windings of different phases (for example, inter-turn short circuit). Another drawback of the circuit is the lack of means for determining the active power consumed or generated by asynchronous machines.
The purpose of the proposed utility model is to increase the reliability of the test circuit of asynchronous machines by the method of mutual load by preventing the possibility of overloading them by controlling the electric power of both machines taking into account possible phase asymmetry and increasing the accuracy of determining the controlled values of electric power while ensuring ease of measurement.
This goal is achieved by the fact that the scheme of testing asynchronous machines by the method of mutual load, consisting of a parameter setter, the first and second current sensors, the first and second uncontrolled rectifiers, powered by a three-phase network, the first and second DC links, electrically connected to each other, inputs which are connected to the outputs of the first and second uncontrolled rectifiers, respectively, of a coupling mechanically linking the first and second asynchronous machines, the first and second controlled and rotors, the outputs of which are connected to the first and second asynchronous machines, respectively, of the first and second computers of the supply voltage frequency, the inputs of which are connected to the outputs of the first and second controlled inverters, respectively, a speed sensor connected to the rotors of the first and second asynchronous machines, a control system whose outputs connected to the control inputs of the first and second controlled inverters; and the outputs of the parameter setter, speed sensor, first and second calculators of the supply voltage frequency, first and second current sensors are connected to the inputs of the control system, equipped with a voltage sensor, the input of which is connected to the DC links, and the output is connected to the input of the control system, indicator, input which is connected to the output of the control system, the output of the first DC link is connected to the power input of the first controlled inverter through the first current sensor, the output of the second DC link the eye is connected to the power input of the second controlled inverter through a second current sensor.
In FIG. a functional diagram of the test of asynchronous machines by the method of mutual load, reflecting the connection of elements.
The proposed mutual load test scheme of asynchronous machines consists of frequency converters 2 and 3 connected to a three-phase network 1, consisting of uncontrolled rectifiers 2.1 and 3.1, DC links 2.2 and 3.2, and controlled inverters 2.3 and 3.3, voltage sensor 4, and parameter setter 5 , indicator 6, current sensors 7 and 8, control system 9, voltage frequency calculators 10 and 11, speed sensor 12, asynchronous machines 13 and 14, whose shafts are interconnected by means of a coupling.
The inputs of uncontrolled rectifiers 2.1 and 3.1 are connected to a three-phase network 1. The inputs of the DC links 2.2 and 3.2 are connected to the outputs of the first and second uncontrolled rectifiers 2.1 and 3.1, respectively. The shafts of the first and second asynchronous machines are interconnected by means of a coupling. The power input of the controlled inverter 2.3 is connected to the output of the DC link 2.2 through the current sensor 7. The power input of the controlled inverter 3.3 is connected to the output of the DC link 3.2 through the current sensor 8. The stator winding of the asynchronous machine 13 is connected to the output of the controlled inverter 2.3, the stator winding of the asynchronous machine 14 is connected to the output of a controlled inverter 3.3. DC links 2.2 and 3.2 are interconnected. The outputs of the control system 9 are connected to the input of the indicator 6 and the control inputs of the controlled inverters 2.3 and 3.3. The inputs of the control system 9 are connected to the output of the parameter setter 5, the output of the voltage sensor 4, the input of which is connected to the DC links 2.2 and 3.2, the outputs of the current sensors 7 and 8, the output of the speed sensor 12 connected to the rotors of the asynchronous machines 13 and 14, the output the frequency calculator of the supply voltage 10, the input of which is connected to the output of the controlled inverter 2.3, the output of the frequency calculator of the supply voltage 11, the input of which is connected to the output of the controlled inverter 3.3.
The device operates as follows. The voltage supplied from the three-phase network 1 is supplied to the input of frequency converters 2 and 3, where it is converted to direct voltage by means of rectifiers 2.1, 3.1, transferred to DC links 2.2, 3.2 and then inverted using controlled inverters 2.3, 3.3 into alternating voltage having desired effective value and frequency.
The process of loading an induction motor is as follows.
For the correct operation of the control system 9, the operator enters the necessary data into the parameter setter 5. The control system 9 operates as follows. Using current sensors 7, 8 and voltage sensor 4, the instantaneous values of power ( rp.p.t1 and p.p.p.t2 ) supplied from direct current links 2.2, 3.2 are controlled via controlled inverters 2.3, 3.3 to both asynchronous machines 13 , 14, the rotational speed of their rotors (n)) increases due to the synchronous increase in the frequency of the voltages supplying them (ƒ 1 and ƒ 2 ) to the nominal value. Control over the frequency of the voltage at the output of the control inverters 2.3, 3.3 is carried out using calculators of the frequency of the supply voltage 10, 11.
After the release of asynchronous machines 13, 14 at the idle speed with a nominal supply voltage at the second asynchronous machine 14 smoothly decreases its supply voltage frequency (ƒ 2), wherein control is exercised over the power P p and ZP z.p.t1 T2 in DC links 2.2 and 3.2. In this case, the second asynchronous machine 14 is loaded in the generator mode, and the first asynchronous machine 13 is loaded in the motor mode to the required slip value (rotation speed), controlled by the speed sensor 12.
The power generated by the asynchronous machine 14 operating in the generator mode is transmitted to the asynchronous machine 13 operating in the motor mode through the electrical connection of the DC links 2.2, 3.2.
The determination of the electrical power of both asynchronous machines 13, 14 is as follows.
Measurements made using a current sensor 7 and a voltage sensor 4 allow the control system 9 to determine the power passing through the controlled inverter 2.3 ( p.s.pt. 1 ). Known in advance power losses in the inverter 2.3 at a given load Δp inv1 allow the control system 9 to determine the electric power of the asynchronous machine 13 as the difference p s.p.t1 and p s.p.t2 .
Measurements made using a current sensor 8 and a voltage sensor 4 allow the control system 9 to determine the power passing through the controlled inverter 3.3 ( p.s.pt. 2 ). Known in advance power losses in the inverter 3.3 at a given load Δp inv2 allow the control system 9 to determine the electric power of the asynchronous machine 14 as the difference p s.p.t2 -Δp inv2 .
Indicator 6 allows you to display certain electric power of asynchronous machines defined by the control system 9.
Thus, the proposed utility model makes it possible to increase the reliability of the test circuit of asynchronous machines by the mutual load method by preventing the possibility of overloading them by controlling the electric power of both machines taking into account possible phase asymmetry and improving the accuracy of determining controlled values of electric power while ensuring ease of measurement.
Sources of information:
1. Patent for utility model R. F. No. 140678, IPC G01R 31/34, 2014.
2. Patent for utility model R. F. No. 143346, IPC G01R 31 / 00,2014.
3. Patent for utility model R. F. No. 163996, IPC G01R 31/34, 2016.

Claims (1)

  1. The mutual load test scheme of asynchronous machines, consisting of a parameter setter, first and second current sensors, first and second uncontrolled rectifiers, powered by a three-phase network, first and second DC links, electrically connected to each other, the inputs of which are connected to the outputs of the first and second uncontrolled rectifiers, respectively, of a coupling mechanically connecting the first and second asynchronous machines, of the first and second controlled inverters, to the outputs of which are connected The first and second asynchronous machines, respectively, of the first and second calculators of the supply voltage frequency, the inputs of which are connected to the outputs of the first and second controlled inverters, respectively, of a speed sensor connected to the rotors of the first and second asynchronous machines, a control system whose outputs are connected to the control inputs of the first and second controlled inverters; moreover, the outputs of the parameter setter, speed sensor, first and second calculators of the supply voltage frequency, first and second current sensors are connected to the inputs of the control system, characterized in that it is supplemented by a voltage sensor, the input of which is connected to the DC links, and the output is connected to the input of the control system , an indicator, the input of which is connected to the output of the control system, the output of the first DC link is connected to the power input of the first controlled inverter through the first current sensor, the output of the second DC link is connected to the power input of the second controlled inverter through a second current sensor.
RU2020104611U 2020-01-31 2020-01-31 Mutual load test scheme of asynchronous machines RU197440U1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102967827A (en) * 2011-09-01 2013-03-13 上海电机系统节能工程技术研究中心有限公司 Energy feedback type test device for three-phase asynchronous motor
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
RU163996U1 (en) * 2016-04-11 2016-08-20 Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный университет путей сообщения" Test diagram for asynchronous electric motors by the method of their mutual load
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

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102967827A (en) * 2011-09-01 2013-03-13 上海电机系统节能工程技术研究中心有限公司 Energy feedback type test device for three-phase asynchronous motor
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
RU163996U1 (en) * 2016-04-11 2016-08-20 Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный университет путей сообщения" Test diagram for asynchronous electric motors by the method of their mutual load
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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