SU1203679A1 - D.c.drive - Google Patents

Description

The invention relates to electrical engineering and can be used in wide-regulating and tracking DC electric drives used in the feed mechanisms of machine tools and presses, robots, manipulators.

The purpose of the invention is to increase reliability.

FIG. 1 shows a diagram of the drive; in fig. 2 is a diagram of a power source voltage control unit; in fig. 3 is a diagram of an actuator with memory.

The direct current drive contains an electric motor 1 and successively connects the base of the transistor 21 and is the input of the node 17, and the other terminals, respectively, to the positive and negative poles of the power source, the resistor 20 in

5, the collector circuit is connected to the positive pole of the power supply, and the emitter of the transistor 21 is connected to the common power supply busbar.

Executive element 7 with memory

W (Fit. 3) contains a transistor 22, a diode 23, three resistors 24-26, a capacitor 27 and a thyristor element 28, with the anode of the diode 23 and the terminal of the first resistor 24 connected to the positive pole of the power source.

Undecided. source 2 of the task, node 3 of the bridge, pulse-width converter 4, in15 the cathode of the diode 23 - with the emitter and one of the outputs of which is connected to the centerplate 27, the second terminal of the electric motor 1, and the second to the node input. first resistor 24 is connected to the base of the trans- 5 control parameters of the electric motor 1, zissra 22, the collector of the transistor 22 through

tachogenerator 6, the output of which is connected to the second resistor 25 and the input thyristor

with the second input of the comparison node 3 and the second 20 of the element 28 is connected to the second plate the input of the node 5 for monitoring the parameters of the electro-capacitor 27 and the common bus, and a resistor 26 is connected to the power output of the thyristor element 28.

The drive operates in the following way.

When the network is turned on and the job signal is non-zero, the comparison node 3 generates a mismatch signal, since the electric motor 1

motor 1, actuator 7 with memory, the power output of which is connected to the motor core 1, node 8 for monitoring network parameters, the output of which is connected to the input of node 9 of the pulse leading edge delay, one three-input 10 and two dual-input nodes II and 12 coincidences , two inverters 13 and 14, two nodes 15 and 16 delays areordered, and the voltage of the tachogenerator 6

The node 17 for monitoring the voltage of the power source is zero. However, the pulse-width

NIN, and the inputs of the first node 10 coincidence are connected to the outputs of the node 8 for monitoring the network parameters, the node 5 for monitoring the parameters of the electric motor 1 and the first inverter 13, and the output for the first input of the second node coming from the node 5 for monitoring the parameters

Converter 4 is locked with a zero signal from node 9 of the leading edge delay coming through node 11 of coincidence. However, regardless of the polarity of the signal.

la 11 coincidence and the input of the second inverter 14, the output of the node 9 of the delayed-edge delay of the pulse is connected to the input of the first node 15 of the delay and the second input of the second node 11 of the coincidence, the output of which is connected to the blocking input of the pulse-width converter 4, the inputs of the third node 12 of the coincidence 12 are connected with the outputs of the first node 15 of the delay and the second inverter 14, and the output of the connected second node 16 of the delay and the node 17 of monitoring the voltage of the power supply source to the input of the actuator 7 with a memory controlling the output of the actuator The memory element 7 is connected to the inputs of the source 2 of the task and the first inverter 13.

The power supply voltage control unit 17 (Fig. 2) consists of three resistors 18-20 and a transistor 21 and is designed as an amplifier stage according to a circuit with a common emitter, with the first and second resistors 18 and 19 being connected by first terminals

motor 1 (in this case, it generates a signal that the speed of motor 1 does not match the reference signal, i.e., zero), the output of node 12 coincides with a logical zero, which is inverted by control voltage generator 17 and receives memory actuator 7, keeps the switching element (for example, a gyristor) locked

through the sequence-, state.

. .45,

At the end of the transient processes in the electric drive, the node 9 of the front-front delay issues a logical unit, at the input of the node 11 a match is also zero, the pulse converter 4 is locked and the electric motor I is inhibited. Thus, when using node 5 of motor controllers 1 and a non-zero reference signal, it is impossible to start the drive.

55 An analogous mode in the electric drive will exist if, when the network is turned on, the logic of operation of the four-pulse converter 4 is disturbed.

to the base of the transistor 21 and are the input of the node 17, and the other terminals, respectively, to the positive and negative poles of the power source, the resistor 20

5, the collector circuit is connected to the positive pole of the power supply, and the emitter of the transistor 21 is connected to the common power supply busbar.

Executive element 7 with memory

(Fit. 3) contains a transistor 22, a diode 23, three resistors 24-26, a capacitor 27 and a thyristor element 28, with the anode of the diode 23 and the terminal of the first resistor 24 connected to the positive pole of the power source.

15 cathode of diode 23 - with an emitter and one of the plates of the concentrator 27, the second terminal of the parameters coming from the node 5 of the control

Converter 4 is locked with a zero signal from node 9 of the leading edge delay coming through node 11 of coincidence. However, regardless of the polarity of the signal.

If the source 2 task signal turns on when the drive is turned on, then both at the beginning and after the end of the transient processes in the drive caused by turning on, the output signal of the node .5 of the control of the paramotors of motor 1 is equal to a logical one (provided that the logic of the converter 4 not broken). And since the signal at the output of the inverter 13 corresponds to a logical unit, then nodes 10 and

The matches also give out the unit and the iirapoTHo-pulse converter 4 is unlocked and ready for operation. At this point in time, the switching element (for example, a thyristor) of the actuating element 7 with memory is closed (the measles of the electric motor 1 is non-earthed), since the output of the node

12 and the node 16 of the delay logical zero, and the output of the node 17 of the control voltage of the power supply control unit is logical one.

When a reference signal comes from the reference 2 source, the electric drive goes into speed tracking mode (motor mode), which is characterized by the separation of the error signal between the reference source signal 2 and the tachogenerator signal 6. Thus, an automatic speed control of the electric motor occurs.

When the network is turned off in the tracking mode at which the output parameters of the electric velocity occur, the following occurs. The control power supply voltage control unit 17 detects a decrease in the power supply voltage of the control circuit and outputs a logical zero to the memory actuator 7, which opens and shunts the main winding of the electric motor 1, thereby producing dynamic braking.

If in the tracking mode there is a change in the parameters of the supply medium (voltage reduction, etc.), then the node 8 of the network parameters control outputs a logical zero, which is immediately processed by the front-edge delay node 9, the coincidence node 11, and locks the pulse-width converter 4 In this case, the node 5 for monitoring the parameters of the electric motor 1 detects a violation of the logic of the pulse-width converter 4 and outputs a logical zero, which is transmitted by the coincidence node 10 is inverted by the inverter 14, and entering the node 12 is the same and, unlocks it. Further, this command passes through the delay node 16, is inverted by the voltage supply control unit 17 of the control power supply, and unlocks the memory actuator 7, which shunts the core winding and dynamically torus35

40

45

50

55

the motor 1 does not match the control signal, the node 5 of the control parameters of the electric motor 1 is triggered, then the pulse-width converter 4 locks and after a time determined by the delay node 16, the control system of the electric drive brakes dynamically in the same way as change the parameters of the power network.

If, in the tracking mode, the voltage of the control system power source disappears, the node 17 controls the voltage of the power source and issues a command to lock the actuator through the memory actuator 7. In this case, the program of the source 2 task stops (if the control system is used as the source of the task) or the task signal is simply turned off when using other sources.

Power supply voltage control unit 17 operates as follows. In the initial state, at the output of the node 17, the logical unit, i.e., the transistor 21 is closed by displacement, over the base. When the logical unit arrives at its input, the transistor 21 opens and the output signal of the node 17 becomes equal to zero, thereby opening the actuator 7 with the memory.

03679

electric motor can 1. Open time. the actuator lasts a period of time until the logical zero through the delay node 15 passes to the node 12 5 coincidence. This time is selected from 25 to 30 ms. This time is sufficient for firing the thyristor element 28 in the actuating element 7 with memory. Next, the thyristor element 28

10 runs independently until the current in the main winding of the electric motor 1 terminates. Simultaneously with switching on the actuator 7 with a memory, which, when turned on, the logical unit at (5 equal output) stops the source program E, if the source The task uses, for example, the CNC system, and the locking of node 10 coincides through the inverter 13. Next, the latitude 20 pulse converter 4 is locked, the node 5 of the control of the parameters of the electric motor 1 outputs a logical zero, and start the electrode igatel 1 can now only if the disable network and eliminate unused

25 justice.

If, in the speed tracking mode, a fault occurs in the pulse-width converter 4, the tachogenerator circuit 6 is cut off or any other mode occurs.

the motor 1 does not match the control signal, the node 5 controls the parameters of the motor 1, then locks the pulse-width converter 4 and after a time determined by the delay node 16, the braking system of the drive control system dynamically brakes as when changing parameters feeding network.

If in the speed tracking mode the voltage of the control system power supply disappears, then the power supply voltage control node 17 issues a command to lock the electric drive through memory actuator 7. In this case, the program of the source 2 task stops (if the control system is used as the source of the task) or the task signal is simply turned off when using other sources.

Power supply voltage control unit 17 operates as follows. In the initial state, at the output of the node 17, the logical unit, i.e., the transistor 21 is closed by displacement, over the base. When a logical unit arrives at its input, the transistor 21 opens and the output signal of the node 17 becomes equal to zero, thereby opening the actuator 7 with the memory.

When the negative voltage of the power source disappears (for example, due to shorting) the voltage at the base of transistor 2) becomes equal - due to the fact that the ratings 18 and 19 are approximately the same, therefore the transistor 21 opens and the voltage at the node output becomes equal to zero.

When the positive voltage of the source disappears, the voltage at the node output is equal to

-ER

and,

 ex

8Ы RI84-RI94-R

ex

Where

and

OUT

RBX

node output voltage; input impedance is a memory element 7 with memory.

In any of the given, the voltage at the output of the node 17 for controlling the voltage of the source is close to zero, which is a call. Actuates the actuator 7 with memory.

Memory actuator 7 operates in the following manner. In the initial state, the transistor 22 is closed by the base bias provided by the resistor 24 and the diode 23. The capacitor 27 is charged to voltage E, the current through the circuit diode 23 - transistor 22 - resistor 25 - control electrode of the thyristor element 28 does not flow. Therefore, thyristor element 28 is closed and the core shunting does not occur. When the input element 7 is brought to the input of the logic zero memory from the source voltage control unit 17, the transistor 22 opens and opens the thyristor element 28, thereby short-circuiting the electric motor 1

through the resistor 26. If the thyristor element 28 contains two thyristors, whose power electrodes are connected in anti-parallel, then a goat of them is ignited, which ensures the passage of an electric current, 1 of the electric field 1, caused by the action of a counter-electrostatic force, in the forward direction . With the disappearance of the positive voltage of the litany source, the diode 23 closes, and the transistor 22 opens under the action of a command received from the source voltage control unit 17, and the inhibitor 27 discharges along the circuit of the transistor element 28. The operation of the other elements of the node is similar to that described above.

With the disappearance of the negative voltage of the Ist-Ochnik, the operation of the actuating element 7 with memory occurs in the same way as with the arrival of commands1 1 to unlock the source voltage control unit 17.

j

Thus, the proposed electric drive ensures reliability in emergency operating modes / gs, caused by a fault wider than the GNS-pulse converter, a mismatch of the output parameters of the motor to the control signal, or when the control circuit power supply fails, it locks the pulse-width converter, first from burning out the power elements, and then the dynamic braking of the electric motor. In addition, the electric drive produces emergency braking of the electric motor when changing the parameters of the power supply network and when the power supply is turned off.

Figg

Editor N. Dumbass

Sosgavigel M Cr Khtunova

Tehred Z. Shliy

Order 8429/60

Circulation 645Subscribing

VNYIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch PPP Patent, Uzhgorod, st. Project, 4

Fig.Z

Proofreader L. PilipN1 «)

Claims (3)

1. A DC electric drive containing an electric motor and a series-connected reference source, a comparison unit, a pulse-width converter, one of the outputs of which is connected to the motor armature, and the other to the first input of the motor parameter monitoring unit, a tachogenerator whose output is connected to the second input the comparison node and the second input of the control unit of the parameters of the electric motor, an actuator with a memory, the power output of which is connected to the armature of the electric motor, characterized in that, in order to increase reliability, it introduced a network parameter monitoring node, a pulse leading edge delay node, one three-input and two two-input coincidence nodes, two integrators, two delay nodes and a voltage source voltage monitoring node, and the output of the network parameters monitoring node is connected to the input the delay front edge pulse delay node, the inputs of the first coincidence node are connected to the outputs of the network parameter control node, the motor parameter control node and the first inverter, and the output is connected to the first input of the second node. coincidence with the input of the second inverter, the output of the delay node of the leading edge of the pulse is connected to the input of the first delay node and to the second input of the second coincidence node, the output of which is connected * to the blocking input of the pulse-width converter, the inputs of the third coincidence node are connected to the outputs of the first delay node and the second inverter, and the output through the second delay unit and the voltage source control unit connected in series to the input of the actuator with memory, the control output of the actuator ementa memory coupled to the inputs of the reference source and the first inverter. 2. Electric drive pop. 1, the fact that the node for monitoring the voltage of the power supply control is composed of three resistors and a transistor and is made in the form of an amplifier stage according to the scheme with a common emitter, the first and second resistors connected by the first clamps to the base of the transistor and are the input of the node, and with other clamps, respectively, to the positive and negative poles of the power supply, the third resistor in the collector circuit is connected to the positive power pole, and the emitter of the transistor is connected to a common bus. 3. Electric drive according to π. I, with the fact that the actuator with memory contains a transistor, a diode, three resistors, a capacitor and a thyristor element, the anode of the diode and the clamp of the first resistor connected to the positive pole of the power source, the cathode of the diode to by the emitter of the transistor and one of the capacitor plates, the second clamp of the first resistor is connected to the base of the transistor, the collector of the transistor through the second resistor and the input of the thyristor element is connected to the second capacitor plate and a common bus, and the power output of the thyristor element includes the third resistor is turned on. SU.,., 1203679