SU989723A1 - Dc electric drive - Google Patents

Description

(54) DC ELECTRIC DRIVE

 . . . one

The image of ognosigs for electrical engineering can be used in direct current electric drives.

Known electric drive containing serially connected unit of speed, speed controllers and current core, core converter, speed sensors and current. Connected to the inputs of the corresponding controllers tl 1

Systems of the subordinate regulation provide for the restriction not only of the adjustable coordinates (currents, speed, etc.) but also their derivatives (current derivative, core, acceleration), which is required by many mechanisms and motors.

An increase in the current derivative of the core at high speeds for engines of many series is unacceptable, since their normal switching may be disrupted. However, in the known device, the derivative of the current of the core is limited to a constant value, independently of the absolute value of velocity, t

leads to an increase in the duration of the transient regimes at all speeds, i.e., to a deterioration in fast action.

The closest to the invention in its technical essence is an electric drive with direct current, comprising an electric motor with a safety sensor, serially connected speed sensor, speed regulator, adder, current regulator core and converter,

10 connected to the eccentructor main circuit, cor current sensor, threshold element, whose inputs are connected to the setpoint and speed sensors, non-linear element C23.

15

If in transient conditions (start, reverse, etc.) the rate of increase. the voltage of the converter reaches its maximum value, the nonlinear element limits the further growth

20 signals at the input of the current regulator. This limits the rate of change in the voltage of the converter and, as such, poppy. The maximum value of the derivative of the current

cor. The limitation of the current derivative of the core in local devices is performed at all speeds, which reduces the speed of the electric drive.

The goal of izofeteniya is to increase the speed of the electric drive.

Delivered del is achieved by addition of an optocoupler and a key to the actuator, the control output of the key is connected to the output of the threshold element, and the power leads are connected to the output of the speed sensor and to the non-linear element code, to the OUT of the optocoupler, the photoresistor of which is connected between the power bus and the output of the adder.

The drawing shows an electric drive circuit. The electric drive contains an electric motor 1 with a speed sensor 2 connected in series with a speed controller 3, a speed controller 4, an adder 5, a current regulator 6 and a converter 7 connected to the electric motor circuit 1, a current sensor 8 , threshold element 9, inputs, which are connected to the setting device 3 and the speed sensor. The control pin of the key 1O is connected to the output of the threshold element 9, and the power leads are connected to the output of the speed point p 2 and to the input of the nonlinear element 11, the output of which is connected to the anode of the LED 12 of the optocoupler 13, the photoresistor 14 of which is connected between the power bus and the output of the adder 5 The drive operates as follows. In established modes at any speeds and at transients at low engine speeds, 25 pts, where Pc is the nominal motor speed l, the threshold element 9 does not work does not close the key Y. In this case, the output voltage of the nonlinear element 11 is equal to its minimum value and does not affect the transient function of the controller 6. In transients at high engine speeds P 0.25p in the presence of a mismatch between the set and true speed values, the threshold element 9 closes the key 10 and the input of the nonlinear element 11 post paet voltage sensor 2 soon:; ti, starting from a speed directly proportional kotorot from about varies the output voltage of the element 11. At t rated speed it has a maximum value, respectively, the resistance of photoresistor 14 has a minimum value, which corresponds to

the value of the derivative of the current cor, allowed at the minimum speed, since limiting the level of the input signal of the current regulator 6 reduces both the slope of the transition function and the magnitude of the initial jump (Fig. 2). When the motor speed reaches a predetermined value, the threshold element 9 opens the key 10, the output voltage of the nonlinear element 11 becomes equal to the minimum

Claims (2)

and the photoresistor 14 takes on such a value that does not affect the operation of yci of the Royssgwa, including the magnitude of the derivative of the current of the core. In transient modes at low speeds, the threshold element 9 does not work. The limitation of the output of the adder 5 does not take effect and, accordingly, there is no limitation of the derivative of the current box. This device provides speed, as from: only from the speed at which the need arises to limit it, and it changes depending on the absolute value of the speed, which allows the engine to be used with a full capacity for its dynamic capabilities, i.e. it is better to use the current and reduce the time transients at all speeds. Invention A direct current drive comprising an electric motor — with a speed sensor, a speed controller serially connected, a speed regulator, an adder, a current regulator and a converter connected to the core-pi motor, current sensor, core, a threshold element whose inputs are connected to a setpoint and a speed sensor, a nonlinear element, characterized in that, in order to improve speed, an optocoupler and a key are additionally entered into it, and the control key output is connected to the output n stratum element, and a power sensor connected to the outlet speed and with the input of the nonlinear element, to the output of which is connected the anode of the LED, which podklyumatora photoresistor. Sources of information taken into account in the examination electric loads of electric drive. M., Energie, 1971, fig. 3-11b, c. 2. Copyright certificate of the USSR 5 № 373823, cl. H O2 P 5/06, 1973.