SU1179507A1 - Reference-input device for electric drive - Google Patents

Abstract

ELECTRIC DRIVE POSITIONING DEVICE containing variable resistors, amplifier with a limiter in the feedback circuit, an integrator with control elements in the feedback circuit, an inverter, characterized in that, in order to expand the range of variation in the shape of the output voltage, a comparator with the resistor threshold is triggered at one of its inputs, while the variable resistors are connected via an integrator with adjustment elements and an amplifier with a limiter in the feedback circuit to the integrator input, the output of which is It is the output of the second comparator input connected to the output of the integrator, and an output - with adjustment elements in the feedback loop of the integrator. (ABOUT

Description

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1 11 The invention relates to electrical engineering and can be used in automated electric drive systems with subordinate adjustment of parameters. The purpose of the invention is to expand the range of the output waveform to the yarn. FIG. 1 shows a diagram of the proposed device; in fig. 2 — graphs of output voltage and engine speed. The driver for the electric drive contains variable resistors 1.2 amplifier 3 with a limiter 4 in the feedback circuit, an integrator 5 with adjustment elements in the feedback circuit, an inverter 6, a comparator 7 with a resistor 8 that triggers a threshold at one of its inputs. Resistors 1 and 2 through the integrator 5 with adjustment elements and amplifier 3 with a limiter 4 in the feedback circuit are connected to the input of the inverter 6, the output of which is the device output, the second input of the comparator 7 is connected to the output of the integrator 5. Elements of the reg The circuits of the integrator 5 in the feedback circuit contain a resistor 11 connected in series by a capacitor 9 and a diode 10, a capacitor 12 and a switch 13 connected by a diode 14 and a variable resistor 15 connected in series to a comparator output 7 Inverter 6 is connected to the input key 17, the device also contains a start key 18 connected to a common point of variable resistors 1 and 2, the first of which controls the deceleration time and the second the acceleration time. Amplifier 3 with adjustable gain. The device works as follows.

Through start switch 18, a positive voltage + Un is applied to the input of the integrator 5. The output signal ramp-up rate is controlled by a variable resistor 2, which forms an integrating integrator circuit 5. With the capacitor 9. voltage. Just

In the smooth acceleration mode, the beginning of the integration change time t is selected depending on the end time of the acceleration process, t ,, B, during the interval t - t, the acceleration rate decreases and the drive smoothly goes to a predetermined speed. If the device is used in drives of complex mechanical transmissions, the start time of integration change 7, the magnitude of this voltage will exceed the voltage threshold of the comparator 7, the signal changes its sign, element 13 is switched through resistor 16 and parallel to capacitor 9 a circuit is connected from resistor 11 and capacitor 12, changing the integration time and output voltage rise rate. In the deceleration mode, the start key 18 is closed, and the recharging of the integrating capacitors 9 and 12 through resistors 2 and 1 from the negative voltage source -Un begins. When the voltage at the output of the integrator 5 becomes less than the threshold of operation, the comparator 7 switches, the capacitor 12 is recharged through the variable resistor 15 and the diode 14 connected in parallel with the key 13. The recharge rate is determined by the variable resistor 1. The resale is performed to zero level The output of the integrator 5, then through the diode 10, a single feedback occurs, preventing the appearance of voltage at the output of the integrator 5 of another sign. The maximum voltage at the output of the integrator 5 is formed in the Nascene mode and is determined by the magnitude of the supply voltage. From the output of the integrator 5, the voltage is fed to the input of the amplifier 3 with an adjustable gain factor, the change of which is carried out using the limiter 4 connected to the feedback circuit. At the output of the amplifier 3, the voltage value is the driving voltage for the drive control system. The sign of this value is set on an inverter 6 having a single gain factor by switching key 17, as a result of which inverter 6 changes the sign of the gain, the output signal of which is the reference signal for the drive control system.

The t is chosen closer to the start of the start time, in which case, at a faster pace, there is a choice of backlashes in the gear and a further smooth acceleration, which eliminates oscillations in the mechanical gear.

Thus, the inventive device makes it possible to control the shape of the output voltage over a wide range. A wide adjustment of the beginning of a change in the constant integration ensures that oscillations are excluded.

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Claims (1)

A DRIVER FOR THE ELECTRIC DRIVE, containing variable resistors, an amplifier with a limiter in the feedback circuit, an integrator with adjustment elements in the feedback circuit, an inverter characterized in that, in order to expand the range of the shape of the output voltage, a comparator with a resistor is introduced into it the threshold at one of its inputs, while the variable resistors through the integrator with adjustment elements and an amplifier with a limiter in the feedback circuit are connected to the input of the integrator, the output of which is the device, the second input of the comparator is connected to the output of the integrator, and the output to the adjustment elements in the feedback circuit of the integrator. 179507