SU972643A1

SU972643A1 - Dc electric drive

Info

Publication number: SU972643A1
Application number: SU813301997A
Authority: SU
Inventors: Евгений Александрович Смотров; Александр Борисович Гудзенко; Борис Васильевич Гулыманов; Леонид Викторович Ганнель; Анатолий Николаевич Николенко
Original assignee: Украинский Научно-Исследовательский Институт Станков И Инструментов "Укрниисип"
Priority date: 1981-06-11
Filing date: 1981-06-11
Publication date: 1982-11-07

Description

Изобретение относитс к электротехнике , а именно к автоматизированному электроприводу, и может быть использовано в замкнутых системах автоматизированного электропривода посто нного тока без тахогенератора.The invention relates to electrical engineering, in particular to an automated electric drive, and can be used in closed systems of an automated DC drive without a tachogenerator.

Известен электропривод посто нного тока, содержащий последовательно соединенные электродвигатель посто нного тока, преобразователь, узел сравнени , второй вход которого соединен через датчик ЭДС с датчиками тока и напр жени электродвигател (Ц.A DC motor is known that comprises a series-connected DC motor, a converter, a comparison unit, the second input of which is connected via an EMF sensor to current and voltage sensors of the electric motor (C.

Наиболее близким по технической сущности к изобретению вл етс электропривод посто нного тока, содержащий последовательно соединенные электродвигатель посто нного тока, преобразователь , узел сравнени , второй вход которого соединен с выходом датчика ЭДС, один вход которого соединен с датчиком тока электродвигател 2.The closest to the technical essence of the invention is a DC electric drive comprising a series-connected DC motor, a converter, a comparison unit, the second input of which is connected to the output of an EMF sensor, one input of which is connected to the current sensor of an electric motor 2.

Недостатком известных электроприводов вл етс низкий диапазон регулировани частоты вращени электродвигател из-за .наличи в напр жении обратной св зи по ЭДС посто нной составл ющей падени напр жени на щеточном контакте, не завис щем от тока нагрузки электродвигател .A disadvantage of the known electric drives is the low range of adjustment of the rotation frequency of the electric motor due to the difference in the feedback voltage from the EMF constant component of the voltage drop across the brush contact independent of the load current of the electric motor.

Целью изобретени вл етс увеличение Диапазона регулировани частоты вращени .The aim of the invention is to increase the speed control range.

Поставленна цель достигаетс тем, что в электропривод посто нного тока введен блок нелинейности, вход которого соединен с выходом датчика The goal is achieved by the fact that a nonlinearity block is inserted into the DC drive, the input of which is connected to the output of the sensor

10 напр жени электродвигател , а выходс вторым входом датчика ЭДС.10 is the voltage of the electric motor, and the output is the second input of the EMF sensor.

На фиг. 1 приведена блок-схема электропривода посто нного тока; на фиг. 2 - пример выполнени тахомет15FIG. 1 is a block diagram of a direct current drive; in fig. 2 - an example of a tachometer 15

рического моста.bridge

Электропривод посто нного тока (фиг. 1) содержит последовательно соединенные электродвигатель, преобразователь 2, узел 3 сравнени , The DC motor (Fig. 1) comprises a series-connected electric motor, a converter 2, a comparison unit 3,

20 в-торой вход которого через датчик 4 ЭДС соединен с датчиком 5 тока, а через блок 6 нелинейности с датчиком 7 напр жени электродвигател 1.20, the input of which is connected to the current sensor 5 through the sensor 4, and through the non-linearity unit 6 to the voltage sensor 7 of the electric motor 1.

Якорь электродвигател 1, датчики 4,5 и 7, блок 6 образуют формирователь 8 обратной св зи по ЭДС электродвигател 1.The armature of the electric motor 1, the sensors 4.5 and 7, the block 6 form the shaper 8 feedback on the EMF of the electric motor 1.

Формирователь 8 обратной св зи по ЭДС электродвигател может быть вы30Shaper 8 feedback on the EMF of the electric motor can be 30

Claims

complete, for example, in the form of a tachometer bridge (Fig. 2), the arms of which are series-connected diodes 9, 10, ..., 9n, Jup, resistors 11 and 12; Measuring the motor 1 and the resistor 13, to the same diagonal of which the output of the converter 2 is connected, the terminals of the other diagonal are the output of the driver 8 The DC drive operates as follows. In the presence of a voltage setting at the input of the node 3 of the comparison with the output of the converter 2, a voltage is applied to the electric motor 1. Through the sensor 7 and block 6, the voltage of the motor 1 is reduced by the voltage of the inactivity zone of the nonlinearity unit 6, which is chosen equal to the constant component of the voltage of the brush contact. motor .1 Through the sensor 5, a voltage proportional to the voltage drop in the core circuit from the core current enters the other input of the EMF sensor 4, including the variable component of the voltage drop on the brush m contact proportional to the armature current shaper 8 When performing the feedback of the motor emf in a tachometric bridge (Figure 2). ivyh | TsTsgChib,,), and., railway,;. where and, „and is the magnitude of the fall on the voltage on resistors 12 and 13; - output voltage of converter 2; - EMF electric motor 1; ., R is the resistance value of the core of the motor 1 resistors 11-13; - voltage drop across the diodes 9,10, ... 9p, Jup, we select equal to the value of the pa or voltage on the brush contact; - current of the electric motor 1. From the equilibrium condition of the tachometer bridge., R, v «bVR Therefore, the voltage at the output of the sensor 4 is the EMF of the electric motor 1, i.e. at the output of the feedback driver 8, it contains only a voltage proportional to the emf of the electric motor. This voltage is applied to one input of the comparison unit 3, while the control system is closed with feedback on the EMF of the electric motor. Thus, the introduction of the non-linearity block b eliminates the constant component of the voltage drop in the brush contact from the voltage | feedback on the electromotive force of the electric motor and, therefore, increase the frequency range of the electric motor. Claims of the invention Electric direct current,. containing a series-connected electric motor, a converter, a comparison unit, the second input of which is connected to the output of the EMF sensor, one input of which is connected to the current sensor of the electric motor, characterized in that, in order to increase the frequency control range of rotation, a nonlinearity unit is inserted, the input of which is connected to the output of the motor voltage sensor, and the output with the second input of the EMF sensor. Sources of information taken into account during the examination 1. USSR author's certificate 375743, cl. H 02 R 5/06, 1973.

2. USSR author's certificate number 773212, cl. H 02 R 5/06, 1980.

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