SU888288A1

SU888288A1 - Device for checking rotor eccentricity relative to stator

Info

Publication number: SU888288A1
Application number: SU792815077A
Authority: SU
Inventors: Александр Михайлович Власенко; Александр Григорьевич Пархоменко
Original assignee: Запорожский Завод "Кремнийполимер"
Priority date: 1979-09-11
Filing date: 1979-09-11
Publication date: 1981-12-07

Description

Изобретение относится к области электрических машин, а именно к устройствам для контроля эксцентрисите-⁴та ротора относительно статора, и может быть использовано для защиты индукторного генератора от увеличения эксцентриситета ротора в схемах релейной защиты индукторных генерато- ’ ров, на зубцах статора которых уложены измерительные катушки, в которых при работе генератора наводятся ЭДС. ’ Известно'устройство, предназначенное для непрерывного контроля эксцентриситета индукторного генератора, которое контролирует изменение эксцентриситета ротора относительно стато- ¹ра при холостом ходе генератора £1]. Данное устройство состоит из магнитоэлектрического логометра с выпрямителем. В логометр вводится параметр L, который равен отношению ЭДС, наводимых в измерительных катушках статора индукторного генератора, а шкала проградуирована в значениях эксцентриси2 тета Е = . Данное устройство позволяет контролировать воздушный зазор при холостом ходе индукторного генератора.The invention relates to the field of electrical machines, and in particular to devices for controlling the eccentricity of the ⁴ rotors relative to the stator, and can be used to protect the inductor generator from increasing the eccentricity of the rotor in the relay protection circuits of inductor generators, on the stator teeth of which measuring coils are placed in which EMF is induced during operation of the generator. 'Known' device, designed for continuous monitoring of the eccentricity of the inductor generator, which controls the change in the eccentricity of the rotor relative to the stator ¹ at idle generator £ 1]. This device consists of a magnetoelectric logometer with a rectifier. The parameter L is entered into the logometer, which is equal to the ratio of the EMF induced in the measuring coils of the stator of the inductor generator, and the scale is calibrated in the values of the eccentricity E = =. This device allows you to control the air gap at idle inductor generator.

Известно также устройство для контроля эксцентриситета ротора относительно статора электрической машины, содержащее измерительные зонды, предназначенные для размещения на статоре, блок измерения разности напряжений с диаметрально расположенных эовдов, блок уставки,сравнения и измерительный блок £2]. Данное техническое решение наиболее близко к изобретению по ^,5· технической сущности и достигаемому результату.There is also known a device for controlling the rotor eccentricity with respect to the stator of an electric machine, containing measuring probes intended for placement on a stator, a unit for measuring the voltage difference from diametrically located electrodes, a set point, a comparison unit, and a measuring unit £ 2]. This technical solution is closest to the invention in terms of ⁵ · technical nature and the achieved result.

Недостаток указанного устройства состоит в том, что абсолютная раз— ²⁰ ность измеренных напряжений с зондов, хотя характеризует величину эксцентриситета, но зависит только от напряжения питания и нагрузки машины.The disadvantage of this device consists in the fact that ²⁰ different absolute voltages of the measurements from the probes, although characterizes the magnitude of the eccentricity, but depends only on the voltage and machine load.

Цель изобретения - повышение точ- \ ности.The purpose of the invention is to increase accuracy.

Для этого устройство снабжено суммирующим блоком сигналов с диаметрально расположенных зондов и блоком деления, при этом блоки измерения разности напряжений и суммирующий подключены на входы блока деления, выход которого соединен с входом блока сравнения.For this, the device is equipped with a summing block of signals from diametrically located probes and a division block, while the voltage difference measuring and summing blocks are connected to the inputs of the division block, the output of which is connected to the input of the comparison unit.

На чертеже представлена электрическая схема устройства для контроля эксцентриситета ротора, которая может быть использована для защиты индукторного генератора от увеличения эксцентриситета ротора относительно статора.The drawing shows an electrical diagram of a device for controlling the eccentricity of the rotor, which can be used to protect the inductor generator from increasing the eccentricity of the rotor relative to the stator.

. Эксцентриситет ротора относительно статора, характеризующий изменение воздушного зазора между ротором и статором, выражается через напряжение, наводимое в измерительных зондах статора, следующей Формулой. The eccentricity of the rotor relative to the stator, characterizing the change in the air gap between the rotor and the stator, is expressed in terms of the voltage induced in the stator measuring probes by the following Formula

Е и₄+и_г E and ₄ + and _g

Устройство для защиты индукторного генератора от увеличения эксцентриситета ротора относительно статора включает в себя блоки суммирования 1 и вычитания 2 напряжений, пропорциональных смещению ротора относительно статора, выполненные на трансформаторах, блок выпрямителя с делителем 3, выполненный по мостовой схеме выкоэффициент К-коэффициент усиления блока 4. Блок 4 приводит уровень напряжений Uк уровню напряжения + принятому за I. В блоке деления 5 эти два напряжения (И + Ц^) и -и_г) сравниваются. ΠρϊΓ сигнале (IL-U- J'K <U_n+U2 выражение ‘К < 1,A device for protecting the inductor generator from increasing the eccentricity of the rotor relative to the stator includes blocks of summing 1 and subtracting 2 voltages proportional to the displacement of the rotor relative to the stator, made on transformers, a rectifier unit with a divider 3 made according to the bridge circuit, coefficient K-gain of block 4. Block 4 gives the voltage level U to the voltage level + taken as I. In division block 5, these two voltages (I + C ^) and -and _g ) are compared. ΠρϊΓ signal (IL-U- J'K <U _n + U2 expression 'K <1,

Выходное напряжение блока деления 5 отрицательно в этом случае и на вход порогового элемента 6 сигнал диодом не пропускается. При сигнале (Uf-UgbK 7 U о выражение У,'¹;·/··К 71 ί . Сигнал на выходе блока деления 5 положителен, т.е. на входе порогового элемента 6 уровень I, что вызывает изменение состояния выхода порогового элемента 6 с уровня ’* I на уровень ”0, сигнализируя о том, что эксцентриситет ротора превышает максимально допустимый уровень. Аналогично построен канал контроля по оси У. Сигналы из каналов X и У поступают на первый и второй входы блока 7, выполняющего функцию ИЛИ. С выхода блока 7 сигнал поступает на вход исполнительного органа 8, осуществляющего индикацию и отключение индукторного генератора от сети, тем самым предотвращая аварию.The output voltage of the division unit 5 is negative in this case, and the signal is not passed to the input of the threshold element 6 by a diode. When the signal (Uf-UgbK 7 U о expression Y, '¹; · / ·· K 71 К. The signal at the output of the division unit 5 is positive, i.e. at the input of the threshold element 6 level I, which causes a change in the output state of the threshold element 6 from level '* I to level' 0, signaling that the rotor eccentricity exceeds the maximum permissible level. A control channel along the Y axis is similarly constructed. Signals from channels X and Y are fed to the first and second inputs of block 7, which performs the function of OR. From the output of block 7, the signal is fed to the input of the executive body 8, which carries out the indication and The shut down inductor-type generator from the network, thereby preventing an accident.

Введение в устройство блока суммипрямления, усилитель 4 сигнала разности напряжений с выпрямителем и делителем, блок 5 деления, сигналов разности и суммы напряжений, пороговый элемент 6, блок ИЛИ 7, имеющий вход первый - для сигнала, пропорционального эксцентриситету ротора по оси X, вход второй - для сигнала, пропорционального эксцентриситету ротора по оси У, исполнительного органа (реле) 8.Introduction to the device of the summing rectifier, amplifier 4 of the voltage difference signal with a rectifier and a divider, division 5, signals of the difference and sum of the voltages, threshold element 6, OR block 7 having an input first for a signal proportional to the rotor eccentricity along the X axis, second input - for a signal proportional to the eccentricity of the rotor along the Y axis, of the actuator (relay) 8.

Схема работает следующим образом. Напряжение с измерительных зондов, расположенных на двух диаметрально противоположных зубцах статора по осям X и У, поступает на первичные обмотки трансформаторов блоков I и 2. Со вторичных обмоток трансформаторов, включенных.;.встречно снимается разность напряжения (U^ - U1J.C обмоток, ’включенных согласно, получаем сумму напряжений (U^+ U^)· Напряжение +U/p поступает на вход блока 3. Напряжение Щ-U 2^п0стУ^{пает на} вход блока 4, где умножается на постоянный рования и деления позволяет уменьшить 35 зависимость полезного сигнала от изменения режима питания и нагрузки электрической машины и в итоге повысить точность контроля эксцентриситета ротора.The scheme works as follows. The voltage from the measuring probes located on two diametrically opposite stator teeth along the X and Y axes is supplied to the primary windings of the transformers of blocks I and 2. The voltage difference (U ^ - U1J.C of the windings, 'switched on according to, we get the sum of the voltages (U ^ + U ^) · The voltage + U / p goes to the input of block 3. The voltage Щ-U 2 ^п0ст У ^{goes to the} input of block 4, where it is multiplied by a constant and dividing, it reduces the 35 dependence useful signal from changing the power mode and the load of the electric machine and ultimately increase the accuracy of the control of the rotor eccentricity.

Claims

(54) DEVICE FOR CONTROL EKSSCHNTRISITETA rotor relative STATOR The present invention relates to the field of electrical machines, in particular to devices for controlling eccentricity of the rotor relative to the stator, and may be used to protect the inductor generator from increasing the eccentricity of the rotor in Schemes relaying inductor generators on the stator teeth which are located measuring coils, in KOTOJ X when the generator is operating, emf is induced. A device is known that is designed to continuously monitor the eccentricity of an inductor generator, which controls the variation of the rotor's eccentricity relative to the stator when the generator is idling. TU This device consists of a magnetoelectric logometer with a rectifier. The parameter L is entered into the logometer, which is equal to the ratio of the EMF induced in the measuring coils of the stator of the inductor generator, and the scale is graduated in terms of the EE value E -g. This device nor allows control of the air gap when the inductor generator is idling. It is also known a device for a coil of an eccentricity of a rotor relative to a stator of an electric machine, comprising measuring probes, prior to Ha3Ha4erfHbie for placing on a stat & a voltage difference measuring unit with diametrically located zovds, a setting unit, a comparison unit and measuring unit 2. This technical solution is the closest to the invention to the technical essence and the achieved result. The disadvantage of this device is that the absolute difference of the measured voltages from the probes, although it characterizes the magnitude of the eccentricity, but depends only on the voltage of the power supply and the load of the machine. 3 The purpose of the invention is to increase accuracy. For this, the device is equipped with a summing unit with diameters of probes and a dividing unit, while the voltage difference measuring and summing units are connected to the inputs of the dividing unit, the output of which is connected to the input of the comparison unit. The drawing shows an electrical diagram of a device for controlling the rotor eccentricity, which can be used to protect the inductor generator from increasing the rotor's eccentricity relative to the stator. The eccentricity of the rotor relative to the stator, which characterizes the change in the air gap between the rotor and the stator, is expressed in terms of the voltage induced in the stator measurement probes, following the E V4 formula A device for protecting an inductor generator against an increase in the eccentricity of the rotor relative to the stator includes summation and subtraction units 2 proportional to the displacement of the rotor relative to the stator, executed on the transformers, the rectifier unit with the divider is made according to the bridge rectifying circuit, amplifier 4 of a voltage difference signal with rectifier and divider, dividing unit 5, difference signals and sum of voltages, threshold element 6, block OR 7 having the first input for a signal proportional to the rotor eccentricity along the X axis, the second input for the signal is proportional to the eccentricity of the rotor on the y-axis, the executive body (relay) 8. The scheme works as follows. The voltage from the measuring terminals located on two diametrically opposite stator teeth along the axes X and Y is fed to the primary windings of the transformers of the blocks} and 2 From the secondary windings of the transformers on ;. the voltage difference (U - Ui) .C windings included according to, we get the sum of voltages (. Voltage (Uy, f 40l) is fed to the input of block 3. Voltage and -, - and 3 is fed to the input of block 4, where it is multiplied by a constant 8 K-gain factor of the block 4. Block 4 leads voltage levels to voltage levels. Neither U + Uji, received by I. V. Blok delinN 5 these two voltages (1 / + i) and (and -Uj) are compared. The PrTG signal {and-Uj jK and (} expression K The output voltage of the division unit 5 is negative in this case and the signal is not transmitted to the input of the threshold element 6. At the signal) K I. Sig7 Uj, the expression at the output of the dividing unit 5 is positive, i.e. at the input of the threshold element 6, level 1, which causes a change nor is the output of threshold element 6 from level 1 to level O, indicating that the rotor eccentricity exceeds the maximum allowable level. A control channel is constructed in a similar way along the Y axis. Signals from the X and Y channels are fed to the first and second inputs of block 7 that performs the OR function. From the output of block 7, the signal is fed to the input of the executive body 8, carrying out the indication and disconnection of the inductor generator from the network, thereby preventing an accident. Introduction to the device of the summation and division unit reduces the dependence of the useful signal on changes in the power mode and the load of the electric machine and ultimately improves the accuracy of control of the rotor eccentricity. An apparatus for monitoring the eccentricity of a rotor relative to the stator of an electric machine, comprising measuring probes to be placed on a stator, a voltage difference measuring unit with diametrically located probes, comparison setpoint j blocks and a measuring unit, characterized in that, in order to improve the accuracy of control The device is equipped with a summing unit of signals with diametrically located probes and a dividing unit, while the unit for measuring the difference of voltages and summations enes on the inputs dele1sh 5 whose output is connected to the input of the comparison unit. Sources of information taken into account during the examination 8882884 1. Industrial energy. 1972. l 1 6, p. 20.

2. Pateit of France No. 2091682, cl. H 02 K 15/00, 1972.