RU2200960C2 - Facility testing ac brushless electric machines - Google Patents

Facility testing ac brushless electric machines Download PDF

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Publication number
RU2200960C2
RU2200960C2 RU2001101213/09A RU2001101213A RU2200960C2 RU 2200960 C2 RU2200960 C2 RU 2200960C2 RU 2001101213/09 A RU2001101213/09 A RU 2001101213/09A RU 2001101213 A RU2001101213 A RU 2001101213A RU 2200960 C2 RU2200960 C2 RU 2200960C2
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Russia
Prior art keywords
generator
voltage
output
input
source
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RU2001101213/09A
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Russian (ru)
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RU2001101213A (en
Inventor
А.С. Курбасов
И.Л. Таргонский
Э.А. Долгошеев
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Открытое акционерное общество "Всероссийский научно-исследовательский и проектно-конструкторский институт электровозостроения"
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Priority to RU2001101213/09A priority Critical patent/RU2200960C2/en
Publication of RU2001101213A publication Critical patent/RU2001101213A/en
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Abstract

FIELD: electrical engineering. SUBSTANCE: technical result of invention consisting in simplification of test circuit and reduction of consumption of electric energy is achieved by connection of DC generator in parallel to DC source and to input of static frequency and voltage converter in facility testing AC brushless electric machines. Winding of independent excitation of DC generator is connected to output of excitation rectifier and its control unit is connected to output of algebraic adder of voltages. Inputs of the latter are connected to voltage pickup of DC source and to voltage pickup of DC generator. EFFECT: simplified test circuit and reduced consumption of electric energy. 1 dwg

Description

 The invention relates to the field of testing powerful brushless AC machines, as well as variable frequency drives based on them at test stations of electric machine-building plants and research organizations.
 A device for testing an asynchronous traction motor with a squirrel-cage rotor (Patent of the Russian Federation N 2023274, MKI 5 G 01 R 31/34), containing electrical and mechanical connecting nodes, first and second load generators, first and second drive motors, first mechanical connecting node rigidly fixed to the shaft of the first load generator, the second conclusions of the anchor winding of the first drive motor and the first load generator are interconnected, the first output of the first drive motor connected to the common bus, the second phase of the load of the generator stator windings are connected to respective terminals of the electrical connector assembly, the shaft of the first drive motor is mechanically connected to the shaft of the second generator load. The scheme allows to increase the accuracy of tests and reduce power losses during testing. The main disadvantage of the device is that tests are carried out only at a sinusoidal voltage, i.e. it is not possible to conduct tests in real conditions of its operation from the converter with a non-sinusoidal current and voltage, which affects the accuracy of determining losses, efficiency, excess temperature of windings and other motor characteristics determined during testing.
 Closer in technical essence to the claimed technical solution is a device for testing brushless AC electric machines (Patent of the Russian Federation N 2071608, MKI 6 G 01 R 31/34). It contains two drive motors (DC and asynchronous). The first is mechanically connected to the second load DC generator, and the second is connected to an alternating current network. The static frequency converter through the second connecting node is connected to the second load generator, and through the first to the test machine, which is connected through the connecting node to the first load generator. The main disadvantage of the device is that a significant cascade of electrical machines reduces the efficiency of the device and increases energy consumption.
 The objective of the invention is to simplify the test circuit and reduce power consumption.
 This is achieved by the fact that in the known test device containing the tested brushless electric machine connected to the output of a static frequency and voltage converter, the input of which is connected to a direct current source, the rotor of the tested machine is mechanically connected to the armature of an independent excitation direct current generator, and the direct current generator connected to the input of a static frequency and voltage converter in parallel with a constant current source, independent excitation winding of a generator A direct current circuit is connected to the output of the rectifier excitation unit, the input of which is connected to an alternating current source, and its control device is connected to the output of a functional converter, the input of which is connected to the output of the algebraic voltage combiner, and its input is connected to a direct current voltage sensor and a voltage sensor DC generator.
 By reducing the number of drive engines compared to the prototype, the power circuit is simplified and energy is saved.
 Schematic diagram of the device shown in the drawing.
 The device contains a tested brushless electric machine 1 connected to the output of the static frequency and voltage converter 2, the rotor 3 of which is mechanically connected to the armature 4 of the DC generator 5, and the DC generator 5 is connected to the input of the static frequency and voltage converter 2 in parallel with the DC source 6 , the winding of the independent excitation 7 of the DC generator 5 is connected to the output of the rectifier installation of excitation 8, the input of which is connected to the AC network 9, and its control device 10 is connected to the output of the functional converter 11, the input of which is connected to the algebraic voltage adder 12, and its inputs are connected to the voltage sensor of the DC source 13 and the voltage sensor of the DC generator 14.
 The device operates as follows. The voltage of the direct current source 6 is supplied to the input of the static frequency and voltage converter 2. The control device 15 generates an alternating voltage of the required frequency and amplitude at its output, which is supplied to the stator winding of the tested brushless electric machine 1. If the tested electric machine is asynchronous or reactive synchronous then it comes into rotation. In the case when the electric machine under test is synchronous of the usual design, it is driven into rotation by switching on the excitation. Since the rotor 3 of the tested electric machine is mechanically connected to the armature 4 of the DC generator 5, it is also driven into rotation. From the output of the rectifier installation of excitation 8, voltage is supplied to the excitation winding 7 of the DC generator 5. Using the excitation control device 10, the current in the excitation winding 7 of the direct current generator 5 is adjusted until the reading of the voltmeter 16 is zero. Those. when the voltage of the DC generator 5 is equal to the voltage of the DC source 6. Then, the contactor 17 is turned on. The signals from the voltage sensor 13 of the DC source 6 and the voltage sensor 14 of the DC generator 5 are fed to the input of the algebraic voltage adder 12. In the steady state, the output voltage adder 12 there is no signal, since the voltage of the DC source 6 is equal to the voltage of the DC generator 5. When changing the mode of a brushless electric machine 1 change the output voltage of the DC generator 5 is selected and the output of the algebraic voltage adder 12 displays a signal proportional to the algebraic sum of the output signals of the voltage sensor 13 of the DC source 6 and the voltage sensor 14 of the DC generator 5, which is input to the functional converter 11. The output signal of the functional converter 11 is fed to the input of the control device 10 of the rectifier installation of excitation 8 and according to its characteristic, the opening angle α is determined thyristors of the rectification excitation installation 8, in this way the required current value in the excitation winding 7 of the DC generator 5 is set, which is necessary to equalize the voltages of the DC source 6 and the DC generator 5, and this achieves a new stable position of the device.
 By reducing the number of drive motors compared to the prototype, the power circuit is simplified and energy is saved by eliminating the cost of electrical and mechanical losses in the excluded drive motor.
 The device operates according to the mutual load (return work) scheme with covering losses in it from a direct current source.
 An example of a specific design can serve as a device for testing the NTA-350 asynchronous traction motor with a rated power of 350 kW. The load generator was the NB-418K direct current traction motor, and the UPSSZ converter of the ENZ electric train with a rated power of 700 kW was a static frequency and voltage converter. As voltage sensors, sensors of the LEM LV-100 type were used. The excitation rectifier was used as a VUV-758 type electric locomotive VL80t. As a functional converter, the upgraded functional converter of the VL80t electric locomotive was used.

Claims (1)

  1.  A device for testing brushless electric AC machines contains a tested brushless electric machine connected to the output of a static frequency and voltage converter, the input of which is connected to a DC source, the rotor of the tested machine is mechanically connected to the armature of an independent excitation DC generator, and the DC generator is connected to the input of the static frequency and voltage Converter, characterized in that the DC generator is connected to steam Along with the direct current source to the input of the static frequency and voltage converter, the independent excitation winding of the direct current generator is connected to the output of the rectifier excitation device, and its control device is connected to the output of the functional converter, the input of which is connected to the output of the algebraic voltage adder, and the inputs of the algebraic voltage adder are connected to the voltage sensor of the DC source and the voltage sensor of the DC generator.
RU2001101213/09A 2001-01-12 2001-01-12 Facility testing ac brushless electric machines RU2200960C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
RU2001101213/09A RU2200960C2 (en) 2001-01-12 2001-01-12 Facility testing ac brushless electric machines

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Application Number Priority Date Filing Date Title
RU2001101213/09A RU2200960C2 (en) 2001-01-12 2001-01-12 Facility testing ac brushless electric machines

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RU2001101213A RU2001101213A (en) 2003-02-10
RU2200960C2 true RU2200960C2 (en) 2003-03-20

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU192278U1 (en) * 2019-05-21 2019-09-11 Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный университет путей сообщения" Asynchronous motor test bench
RU2705915C1 (en) * 2019-01-28 2019-11-12 Илья Николаевич Джус Method for start-up of percussion electric generator of test bench

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2705915C1 (en) * 2019-01-28 2019-11-12 Илья Николаевич Джус Method for start-up of percussion electric generator of test bench
RU192278U1 (en) * 2019-05-21 2019-09-11 Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный университет путей сообщения" Asynchronous motor test bench

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Effective date: 20050113