SU744880A1 - Device for control of all-purpose commutator motor - Google Patents

Description

The invention relates to electrical engineering and can be used in electrical and medical biological centrifuges. Devices for controlling the speed of electric motors, made on semiconductor devices, in which smooth start and stabilization at a given frequency of rotation of the electric motor are provided independently of external factors by a regulator operating in the phase tracking mode and generating a control signal from the difference between the standard and the signals, are known. from the frequency of rotation fl. However, the functional diagrams of these devices are complex, since additional devices are used to ensure a smooth start. The closest to the proposed technical entity is a device for regulating the speed of an AC electric motor, containing a series-connected tachogenerator, a control circuit, a pulse amplifier and an electronic; key. The control circuit consists of a rectifier, a comparator and a generator connected in series f2. This device does not provide a smooth start and stable stabilization of the rotational speed of the electric motor at a given level, because when the electronic key is turned on, full full-wave pulses are applied to the electric motor, i.e., a sharp increase in torque occurs. The purpose of the invention is to ensure a smooth start and stable stabilization of the rotation frequency of the universal collector engine at a given level. The goal is achieved by the fact that the control circuits consist of a series-connected threshold device, a pulse-width modulator of a clock capacitor, and a modulated pulse generator, with a 374 second terminal of the modulator connected to the output of a pulse amplifier. FIG. 1 is a functional diagram of a control device for a horizontal collector engine; on phage. 2 is a diagram from the 5th of the duration of the supply of a capr: w: to a direct current electric motor in its correspondence with a duration disturbance. 1.L pauses Са between pulses Сс and a constant T period following pulses and pauses; Fig. 3 shows the anagram of the variation of the mains voltage supplied; aa AC torrent, depending on the change in the length of the length of the current Depending on the change in the h-pauses Y / g between the pulses at a constant period T of the pulses and pauses in Fig. 4 - curve for the frequency of rotation of the motor with time with a smooth start and stabilization of the frequency of rotation. The device for controlling a motor engine contains a tachogenerator 1. control circuit 2, pulse amplifier 3, electronic switch 4, connected in series. The electric motor 5 is connected to the network via an eggektrony key 4 to mechanically connected to the max generator 1. The regulating circuit 2 consists of a threshold device 6 connected in series, a pulse width modulator 7 with a capacitance capacitor 8 and a generator 8 of modular impulses. In the input of the modulator 7 with zion with the output of a pulse amplifier. The device operates as follows. The threshold device 6, the modulator 7, the generator 8 and the impulse: the amplifier 3 receive a power supply from a non-stabilized direct current source (not shown in the drawing). With an atom, the maximum control voltage is applied to the generator 8 from the modulator 7 (since the voltage on the modulator clock capacitor is zero) under which the generator B generates pulses with a mini-pause and pulse pulse 3 generates pulses voltage for pulse charging of the clock capacitor mod. torus 7 to control the electronic key 4. The electronic key 4 is switched on at the beginning of the pause between the nmiula ch at the output of the generator 8, and off: 8} J.ie by the end of the pause. When the electric key of the key 4 is turned on, the electric motor 5 is supplied with a network voltage, the average value of which depends on the duration of the pause between the pulses of the generator 8. In the initial period of operation of the device, the generator 8 generates pulses with a minimum pause, therefore, the average electric value is applied to the electric motor 5 network nagr wife, i.e. The acceleration of the electroshock starts. As a result, the pulsed porous shoiHypyroomer where the modulator 7 modulator smoothly decreases the control voltage, which comes from the modulator 7 to the generator 8 "The duration of the pause between the impulses at the output of the generator5 is increased from the generator 8 to the generator 8, the duration of the pause between impulses on the output of the generator 5 increases from the generator 8 to the generator 8. the value of the mains supply to the electric motor 5, there is a smooth set of the frequency of the rotation of the electric motor. When the electric motor 5 reaches a predetermined rotational speed, the voltage at the output of the generator generator 1 reaches a value of W-1J, at which the threshold device HBO 6 is triggered, the Paapsiu timing clock capacitor 7 occurs at a certain speed, as a result of which the output voltage increases modulator 7, the dwell between the pulses at the output of the generator 8 decreases, and the average voltage applied to the motor 3 decreases, i.e. his frequency begins to dawn. The rotation of the frequency of rotation of the electric actuator continues until the tension at the output of the tachogenerator 1 falls to the upper level, at which it stops C | Abva1 ps-horn device 6, This is the first control cycle of the electroangalizer and the next step begins, with KoipooM, a fine-sized capacitor with the speed of top 7 is charged and discharged, but with much less load variation. The proposed motor control device, when used with its 0 g-bilge centrifuges, allows for improved quality of medical and biological investigations. Fo rumula of the invention. The control of the universal collector motor, containing a series-connected tachogenerator, an adjustment circuit, a pulse amplifier and an electronic circuit, which is characterized by the fact that a soft start circuit and a stable stabilization of the frequency of rotation of the electric motor at a given level , the control circuit consists of a threshold device connected in series, a pulse-width modulator with a timing capacitor and a generator of power-operated pulses, Torah soeyinen input of modulator pulse output with the amplifier.

Information sources

taken into account in the examination

1. The patent of Germany No. 1932574, cl. H 02 R 5/00, 1972.

2. The UK patent K 1265701 cl. G-3 R 1972.

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Claims (1)

A device for controlling a universal collector engine, containing a tachogenerator connected in series, a control circuit, a pulse 7 14680 amplifier and an electronic key, characterized in that, in order to ensure smooth start-up and stable stabilization of the motor speed at a given level, the control circuit consists of a threshold device, a pulse-width modulator with a timing capacitor and a generator pulses, and the second input of the modulator is connected to the output of the pulse amplifier.