SU723670A1

SU723670A1 - Apparatus for magnetic recording and reproducing

Info

Publication number: SU723670A1
Application number: SU782646122A
Authority: SU
Inventors: Николай Николаевич Демченко; Алексей Кузьмич Малеванный; Андрей Тимофеевич Новиков
Original assignee: Предприятие П/Я А-3103
Priority date: 1978-07-19
Filing date: 1978-07-19
Publication date: 1980-03-25

Description

Изобретение относится к области приборостроения и может быть использовано в аппаратах магнитной записи для регулирования работы электродвигателя (ЭДГ), в основном работающего в приводе магнитной ленты (МЛ). ₅ The invention relates to the field of instrumentation and can be used in magnetic recording devices to regulate the operation of an electric motor (EDG), mainly working in a magnetic tape drive (ML). ₅

Известно устройство, с помощью которого осуществляют автоматическое регулирование скорости движения МЛ [1].A device is known with which automatic control of the ML speed is carried out [1].

В этом устройстве происходит форсированный разгон ЭДГ, что требует сложной и доро- ₁₀гостоящей схемы разового пуска и применения маховиков со значительной массой. Такое устройство пригодно в основном для дорогостоящих аппаратов специального назначения и энергетически оно не всегда приемлемо. ₁₅ In this device, forced EDG acceleration occurs, which requires a complex and expensive ₁₀ -time single-start circuit and the use of flywheels with a significant mass. Such a device is suitable mainly for expensive special purpose vehicles and energetically it is not always acceptable. _fifteen

Наиболее близким к предлагаемому является устройство для магнитной записи и воспроизведения информации, содержащее последовательно соединенные формирователь, частотный детектор (ЧД), схему сравнения (СС), усиди- _χтель мощности (УМ), ЭДГ и датчик скорости (ДС), при этом ЧД выполнен на двух транзисторах, эмиттеры которых заземлены, базы соединены с переключателем скорости (ПС) движения МЛ, а коллекторы через последовательно соединенные нагрузочные резисторы подключены к положительному зажиму заземленного конденсатора фильтра, к входу СС, через первый диод — к катоду второго диода и к переходному конденсатору, соединенному с разными выходами формирователя [2].The closest to the proposed device is a magnetic recording and reproducing information, comprising a series-connected generator, a frequency detector (FD), a comparison circuit (CC) usidi- _χ Tel power (PA), EDD and a speed sensor (DS), wherein a BH made on two transistors, the emitters of which are grounded, the bases are connected to the ML speed switch (PS), and the collectors are connected through series-connected load resistors to the positive terminal of the grounded filter capacitor, to the SS input, h Res first diode - to the cathode of the second diode and to the transition to a capacitor connected to different outputs of generator [2].

Это устройство также обладает достаточно большими по длительности переходными процессами, проявляющимися при пуске лентопротяжного механизма (ЛПМ) в широком диагизоне скоростей вращения ротора ЭДГ этого механизма.This device also has a sufficiently long transient process that occurs when the tape drive mechanism (CVL) is launched in a wide diagonal of the EDG rotor speed of this mechanism.

Цель изобретения - уменьшение длительности переходных процессов при пуске лентопротяжного механизма в широком диапазоне скоростей вращения ротора электродвигателя этого механизма.The purpose of the invention is the reduction in the duration of transients when starting the tape drive in a wide range of rotational speeds of the rotor of the electric motor of this mechanism.

Достижение поставленной цели осуществляется за счет того, что устройство снабжено заземленным опорным источником питания (ОИП), подключенным к нему третьим диодом, катод которого связан с положительным зажимом конденсатора фильтра (КФ), дополнитель3 ным конденсатором (ЛК). другой вывод которого соединен с положительной шиной питания, и дополнительным резистором (ДР), также подключенным к этой шине питания.Achieving this goal is due to the fact that the device is equipped with a grounded reference power supply (OIPS) connected to it by a third diode, the cathode of which is connected to the positive clamp of the filter capacitor (CF), an additional capacitor (LC). the other terminal of which is connected to the positive power bus, and an additional resistor (DR), also connected to this power bus.

На чертеже приведена схема описываемого устройства.The drawing shows a diagram of the described device.

ЛПМ 1 выполнен с ЭДГ 2, который подключен к ДС.З. Формирователь 4, входящий в схему 5 управления ЭДГ, подключен к ЧД 6, содержащему нагрузочные резисторы 7 и 8, стабилизирующий резистор 9, транзисторы 10 и 11. Базы обоих транзисторов соединены с ПС 12. Положительный зажим КФ 13 через СС 14 соединен с УМ 15. В ЧД 6 использованы также ДКLM 1 is made with EDG 2, which is connected to DS.Z. The shaper 4, which is included in the EDG control circuit 5, is connected to the BH 6, which contains load resistors 7 and 8, a stabilizing resistor 9, transistors 10 and 11. The bases of both transistors are connected to PS 12. The positive terminal of KF 13 is connected to CM 15 through SS 14 . In BH 6 are also used DC

16, ОИП 17, диод 18 и ДР 19. ДК 16 и ДР 19 15 подключены к положительной шине питания 20, а диод 18 через диоды 21, 22 и через конденсатор 23, являющийся переходным, подключен к разным выходам формирователя 4.16, IPR 17, diode 18 and DR 19. DK 16 and DR 19 15 are connected to the positive power bus 20, and diode 18 is connected to different outputs of the shaper 4 through diodes 21, 22 and through a capacitor 23, which is a transitional one.

Устройство работает следующим образом.The device operates as follows.

При включении напряжения питания СС 14 вырабатывает сигнал, который позволяет через УМ 15 подать на ЭДГ 2 питание и ЭДГ 2 начинает форсированно вращать свой ротор. Возрастает при этом и частота сигналов с ДС 3 и тогда на выходе ЧД 6 появляется напряжение, при определенной величине которого вновь срабатывает СС 14. Одновременно при включении питания появляется напряжение и на ОИП, и тогда потенциал точки 24 оказывается выше потенциала точки 25. Диод 18 открывается и КФ 13 начинает ускоренно заряжаться от ОИПWhen you turn on the supply voltage, the SS 14 generates a signal that allows you to supply power to the EDG 2 through the UM 15 and the EDG 2 starts to rotate its rotor forcibly. At the same time, the frequency of signals from DS 3 also increases, and then the voltage appears at the output of BH 6, at a certain value of which the SS 14 again reacts. At the same time, when the power is turned on, the voltage also appears on the IPR, and then the potential of point 24 is higher than the potential of point 25. Diode 18 opens and CF 13 begins to charge rapidly from the IPR

17. При превышении напряжения .и КФ 13 напряжения на ОИП 17 срабатывает СС 14 и отключается ЭДГ 2, не давая дальше разгоняться его ротору. Когда снижаются показания ДС' 3, процесс повторяется.17. When the voltage .and KF 13 is exceeded, the voltage on the IPR 17 is triggered by the SS 14 and the EDG 2 is turned off, preventing its rotor from accelerating further. When the reading of DS '3 decreases, the process repeats.

Таким образом за счет достаточно простого и недорогого решения оказывается возможным повысить равномерность движения ротораThus, due to a fairly simple and inexpensive solution, it is possible to increase the uniformity of rotor movement

72Ю7О 4 электродвигателя, а, следовательно, и магнитной . ленты (на чертеже ре показана).72У7О 4 electric motors, and, therefore, magnetic. tape (shown in the drawing).

Claims

The invention relates to the field of instrumentation and can be used in magnetic recording apparatus for regulating the operation of an electric motor (EDG), in the main operating in a magnetic tape drive (ML). It is known a device with the help of which automatic regulation of the speed of movement of the ML (1. In this device, accelerated acceleration of the EDG occurs, which requires a complex and expensive single start-up scheme and the use of flywheels with a significant mass. Such a device is suitable mainly for expensive spacers purpose and energetically it is not always acceptable. The closest to the present is with a device for magnetic recording and reproduction of information containing The shaper, frequency detector (BH), comparison circuit (CC), power amplifier (PA), EDG, and speed sensor (DC), while the BH is made on two transistors whose emitters are grounded, the bases are connected to a speed switch (PS) movement of the ML, and the collectors are connected through series-connected load resistors to the positive terminal of the grounded filter capacitor, to the input of the CC, through the first diode to the cathode of the second diode and to the transition capacitor connected to different outputs of the driver 2. This device is so It has sufficiently long transient processes, which appear when the tape mechanism starts (LPR) in a wide range of rotation speeds of the EDG rotor of this mechanism. The purpose of the invention is to reduce the duration of transients during the start of the tape mechanism in the wide range of rotor speeds of the electric motor of this mechanism. Achieving this goal is due to the fact that the device is equipped with a grounded reference power source (IPP), connected to it by a third diode, the cathode of which is connected to the positive terminal of a filter capacitor (KF), an additional capacitor (LC). the other pin of which is connected to a power supply busbar, and an additional resistor (DR), also connected to this power supply tin. The drawing shows a diagram of the described device. LGTM 1 is made with EDG 2, which is connected to DS.Z. Shaper 4, included in the EDG control circuit 5, is connected to PD 6, which contains load resistors 7 and 8, stabilizing resistor 9, transistors 10 and 11. The bases of both transistors are connected to PS 12. Positive terminal KF 13 through SS 14 is connected to UM 15. In BF 6, DC 16, IPD 17, diode 18 and DR 19, DC 16 and DR 19 are also connected to the positive power supply bar 20, and diode 18 through diodes 21, 22 and through a capacitor 23, which is transient, is connected to different outputs of the imager 4. The device operates as follows. When the power supply voltage is turned on, the SG 14 generates a signal that allows the EDG 2 to supply power to the EDG 2 and the EDG 2 begins to forcefully rotate its rotor. At the same time, the frequency of the signals from DC 3 increases, and then voltage appears at the output of PD 6, at a certain velitone of which SG 14 is triggered. At the same time, when the power is turned on, voltage on the IPR appears, and then the potential of point 24 is higher Potential point 25. Diode 18 opens and KF 13 starts to accelerately charge from the IPD 17. When the voltage on Kp 13 increases, the voltage on the IPP 17 triggers SS 14 and turns off EDG 2, not allowing it to accelerate to the rotor. When the DS 3 reading decreases, the process repeats. Thus, due to a fairly simple and inexpensive solution, it is possible to increase the guest’s uniform motion of the rotor of the electric motor, and, of course, of the magnetic tape (shown in the Fc drawing). Apparatus of the Invention The device for magnetic recording and reproduction of information containing sequentially connected a formulator, a frequency detector, a comparison circuit, a power amplifier, a zlectro / puller, and a speed sensor, the frequency detector being made on two transistors, the emitters of which are grounded 1) 1, bases connected to the speed switch of the magnetic tape, and the collectors are connected through series-connected load resistors to the positive terminal of the grounded filter capacitor, to the input of the circuit We compare, through the first diode, the cathode of the second diode and to the ne, a traveling cosunator connected to different outputs of the former, characterized in that, in order to reduce the duration of the transient processes during the launch of the tape drive mechanism in the rotor speed range of the rotor motor of this mechanism It is equipped with a grounded reference power source, which is supplied by a third diode, whose cathode is connected to a positive clamped filter capacitor, an additional capacitor, the other output of which is connected Inen with a positive power rail and an additional resistor also connected to this power rail. Sources of information taken into account in the examination 1. The author's certificate of the USSR N 493801, cl. G 11 B 15/46, 1973.

2. USSR author's certificate N 483702, cl. G 11 V 15/44, 1973 (prototype).