SU1164849A1 - Device for controlling thyratron motor - Google Patents

Abstract

A FAN MOTOR CONTROL DEVICE, containing a rotor position sensor with two sets of sensing elements, each of which is connected to a corresponding rotational direction sensor, a comparison unit with two inputs, the first of which is connected to the output of one of the rotating sensors, a prohibition unit with information and control inputs, a Forward - Backward signal shaping unit with control and inhibiting inputs, com- mand switches, Mand. Forward-backward and Start-stop, the first controlled investment rtor, information input connected to the output of the command switch Forward-backward, control (it is the input to the output of the Start-stop command switch connected to the control input of the BAN, the information input of which is connected to the output of the comparator, and the output of the BANE connected to the prohibitor input of the signal forming unit Forward-backward, with which at least one of the sets of sensing elements of the position sensor is connected, in order to improve accuracy and decrease the stopping time by eliminating the run-out of the rotor of the valve motor, nor VO, is barely disconnected, the second and third controlled inverters are introduced, two four-input adders, the output of the second rotational direction sensor connected to the second input of the unit is compared 11, the output of the first inverter is connected to the information input of the second inverter, output ; connected with the third-party information input third 9 90 its inverter, the output of which is connected to the control input of the signal conditioning block Forward-backward, iU CD the first and second inputs of the adders dinene with the outputs of the first and second sensors of the direction of rotation, respectively, the third inputs of the adders - with the output of the command switch / Forward - back, the output of the switch of the stop command switch is connected to the fourth inputs of the adders, the output of the combined adder is one of the entered adder, inverter.

Description

The invention relates to electrical engineering, in particular, to an electric drive and can be used in systems and devices where it requires emergency braking, for example, in a positional drive, in robot-drive drives, etc. A device for braking a valve electric motor, containing a frequency converter, whose key control circuits are connected to the output of a multi-channel rotor position sensor via serially connected control unit BAN and a signal generating unit of the right and left direction of rotation, the control input of which is connected to the logic output. TEMPTING OR circuits, to the two inputs of the logic circuit EXCLUSIVE OR. The output of the direction direction adjuster and the trigger output of the Start and Stop commands, dates are connected. Zero speed rotation, the output of which is connected with the control input of the BANGE block. A disadvantage of the known technical solution is low reliability due to the possibility of free inductor two gears after the OS, which may occur under the action of varying moments of load on the motor shaft. The presence of free movements of the valve electric motor in the stop mode may result in the inoperability of drive devices, such as positioning drives, robot technology drives, etc. Closest to the invention is a device for controlling a valve electric motor, comprising a rotor position sensor with two sets of sensing elements, each of which is connected to a corresponding rotational direction sensor, a comparison unit with two inputs, the first of which is connected to the output of one of the sensors krv of direction, rotation, blocking unit with informational and control inputs, block of forming signals Forward - backward with control and beyond the precursor inputs, switches of commands Forward - backward, P ck stop, the first controlled inverter, information input connected to the output of the forward and backward command switch, control input 92 to the output of the command switch. Start input of the BAN unit, whose information input is connected to the output of the control unit, and the output of the blocker is connected to the inhibitory an input to the signal-shaping unit Forward back, to which at least one of the sets of position sensor 2 sensing elements is connected. The disadvantage of this technical solution is low reliability due to the possibility of free movement of the inductor after stopping, caused by the action of varying load moment on the motor shaft, low accuracy and longer stopping time due to the presence of unpredictable coasting out after stopping. The aim of the invention is to improve the accuracy and decrease the stopping time by eliminating the run-out of the rotor of the valve motor after it is turned off. The goal is achieved by the fact that a device for controlling a valve electric motor, comprising a rotor position sensor with two sets of sensing elements, each of which is connected to a corresponding rotational direction sensor, a comparison unit with two inputs, the first and the same, rotation, the prohibition unit with information and control inputs, the Forward - Backward signal generation unit with the control and inhibit inputs, the Forward - Back and Start commands selectors - stop, first control inverter, information input connected to the output of the command switch Forward-backward, control input - to the output of the switch of the Start-stop command connected to the control input of the BANCH unit, information input of which is connected to the output of the comparison unit, and code the BAN block is connected to the prohibitive input of the signal forming block Forward - back, with which at least one set of position sensor sensitive elements is connected, the second and third controlled inverters are introduced, two A four-input adder, the output of the second rotational direction sensor is connected to the second input of the comparison unit, the information input of the second inverter is connected to the output of the first inverter, the output connected to the information input of the third inverter, the output of which is connected to the control input of the signal-generating unit, Forward and backward the first and second inputs of the adders are connected to the outputs of the first and second sensors of the direction of rotation, respectively, the third inputs of the adders with the output of the command switch Vpe. ed. - back , the output of the Start - Stop command switch is connected to the fourth inputs of the adders, the output of the caddy adder is connected to the control input of one of the entered, corresponding to this adder controlled by the inverter.

FIG. 1 is a functional diagram of a device for controlling a valve motor; in fig. 2 - voltage plots that illustrate the operation of the device; on r. 3 and 4 are diagrams showing the movement of the inductor of a valve electric motor in the region of zero rotation frequency.

The device for controlling the valve electric motor 1 comprises a rotor position sensor 2 (DPR) with two sets of sensing elements (SE). One set of sensing elements is connected to the first sensor 3 of the direction of rotation, the other set to the second sensor 4 of the direction of rotation.

The device also contains a block 5 of comparison with two inputs, the first of which is connected to the output of the rotational direction sensor 3, and the second to the rotational direction sensor 4, a BAN 6 block with information 7 and 8 control inputs, a signal generation block 9 Forward-backward control 10 and prohibit 11 inputs, command switches Forward-back 12 and Start-stop 13, the first-controlled inverter 14, information input 15 connected to the output of the switch 12 commands Forward-backward, and control input 16 to the output of the switch 13 Start commands - st connected to

with the control input of the BAN 6 block, the information input 7 of the BAN 6 block is connected to the output of the compare block 5, and the output 17 of the BAN block is connected to the forbidden input of the signal generating unit 9 Forward - back, to which at least one set of sensor elements is connected position

The second and third controlled inverters 18 and 19, two four-input cjT iaTоr -20 and 21 are introduced into the device.

The information input of the second inverter 18 is connected to the output of the first inverter 14, and the output of the inverter 18 is connected to the information input of the third inverter 19, the output of which is connected to the control input 10 of the Forward-Forming Signal 9 block 9, the first and second inputs of the adders are connected to the outputs of the first and second rotation direction sensors 3 and 4, respectively, the third inputs of adders - with the output of the switch 12 commands Forward - back, the output of the switch 13 commands Start-stop is connected to the fourth inputs of the adders 20 and 21. The output of the adder 20 union of a control input 22 of the second inverter 18 and the output of the adder 21, - a control input 23 of the third inverter 19.

FIG. 1 also shows the converter 24 of the frequency of the valve motor 1 and the source 25 of energy. The output of the Forward - Backward signal generation unit 9 is connected to a frequency converter 24, the output of which is connected to a valve motor 1. A Forward - Backward command switch 12 and a Start - Stop command switch 13 Each consists of a switch and a resistor. When the contacts are closed, the switch at the output of the command switch has a potential of 1. With the contacts open, the potential output of the switch is O.

 Sensor 3 and 4 directions of rotation operate on the principle of controlling the order of alternation of signals from sensitive elements (DPR) 2.

Comparison unit 5, the controlled inverters 14, 18, and 19, are implemented on EXCLUSIVE OR logic circuits. Block BAN 6 is made on the logic circuit And with one inverting. And one lrllch inputs. Adder 20 is made on logic circuit 4I with two inverting channels, adder 21 on logic circuit A OR with one inverting input, Switch 12 commands Forward back sets via controlled inverters 14J 18 and 19 at the input of the signal conditioning unit Forward back appropriate level logical signal. A start-stop command switch 13 controls the inverter inverter mode 14. In mode, the inverter 14 inverts the signal of the switch 12 commands; Forward backward, in stop mode, the inverter 14 does not invert the signal. In Stop mode, the command 13 switch Start - Stop generates a signal O. The presence of which at the input of the block BANCH 6 permits the latter to generate a signal to stop at the appearance of signals of different levels at the outputs of sensors 3 and 4 of the direction of rotation. The adder 20 summarizes the Forward signals from the sensors 3 and 4 of the direction of rotation with commands and Back with the switches 13 and 12 commands, respectively. The adder 21 summarizes the signals Back from the sensors 3 and 4 of the direction of rotation in the presence of commands Stop and Forward with switches 13 and 12 teams, respectively. The device works as follows. When the Start command is given (time tj, fig. 2), the output of the Start / Stop command switch 13 is set to level 1 (U | Fig. 2; hereinafter, the index denotes the element of the functional circuit whose output signal is considered). The same level is present at control input 8 of the block, BAN 6 and at the second control input of each adder 20 and 21s, which excludes the formation of a stop signal from the BAN 6 and summation of the signals of the rotational direction sensors 3 and 4 at the adders 20 and 21. Simultaneously with the task of the Start command, the Forward command can be set, Level 1 is fed to the input 15 of the controlled inverter 14, where it is inverted to. Passing through the controlled inverters 18 and, 19, without changing, it goes to the input 10 of the signal 9 to generate signals Forward - backward, B moment of time At t, j, input 11 of block 9 receives level 1 from block BANGE 6. Command block 9 Forward - backward begins to generate control signals for frequency converter 24 according to signals from rotor position sensor 2 in accordance with the set Forward command, the valve motor starts accelerate. At the outputs of the rotational direction sensors 3 and 4, level 1 appears, corresponding to the forward direction of rotation. The signal 1 at the output of the rotational direction sensor 4 appears later (t2), since it receives information from the sensitive elements of the rotor position sensor, which are shifted relative to the sensitive elements, which transmit information to the rotational direction sensor 3 (Fig. 3). After issuing the Stop command (tj) at the output of the Switch 13 of the Start-stop commands, the level is set to O. This leads to a change in the signal level at the input 10 of the signal-shaping unit 9 Forward backwards, which starts the counter-switching mode. The engine starts to brake. By the time t4 (figs, 2 and 3) the inductor passes a zero frequency of rotation and begins to move in the opposite direction (back). At time t, the order of alternating signals of sensitive elements changes and the rotational direction sensor 3 switches. At its output a signal appears. Sensor .4 rotational voltage still produces signal 1. At the inputs of the comparison block 5 there are different logical signals, this leads to appearance at its output 1. If there is 1 at input 7 and O at input 11 (t) block BAN 6 generates a signal O, prohibiting the block 9 of generating signals Forward - backward to generate control signals. The motor 1 is disconnected from the power source 25 (t). In other words, the appearance of different logic signals at the outputs of the sensors 3 and 4 of the rotation direction with the Stop command causes the motor to turn off. After the frequency converter has been turned off, the motor stops on coast down. The presence of external; 4 points on the motor shaft can lead to the movement of the shaft of the valve motor in one direction or another. If the motor shaft continues to run backwards, then at time tj. the rotor position sensor signaling element intersects the second sensing element (Figs. 2 and 3) and the rotational direction sensors 3 and 4 switch. On both sensors, the level O is set, which leads to the establishment of 1 at the output of the BAN 6. The signal-shaping unit 9 Forward-backward begins to generate control signals. At the same time, the signals of the sensors 3 and 4 of the direction of rotation are summed at the adder 21, since at its first and second control inputs there are control levels 1 and 0, respectively. At the output of the adder 21, a signal G appears, which leads to a change in the level of the signal at the control input; 10 block 9 of the formation of signals Forward - backward. The change in the level is accomplished by inverting the signal on the inverter 19. The signal generating unit 9 Forwards and backwards begins to generate control signals that take the electric motor into anti-switching mode. After passing through zero speed, the engine starts to rotate. Changing the order of alternation of signals on a set of sensitive elements at the moment t causes a change in the state of the rotational direction sensor 4. On the codes of the rotational direction sensors 3 and 4, different logical signals appear. This again causes the motor 1 to be disconnected from the power source 25. The presence of external moments on the motor shaft may cause the shaft to move forward. In this case, after the signal element intersects the position of the first set of sensitive elements at time t, the logical signals at the outputs of sensors 3 and 4 of direction 49 .8 of rotation are equal and equal to 1. Signal conditioning unit 9 will forward to generate control signals , providing a mode of opposition, similar to the time interval (Fig. 2). After passing through zero speed, the motor will begin to rotate. At the moment of time to, the signals on the sensors 3 and 4 of the direction of rotation will become different and the electric motor 1 will be disconnected from the power source 25. The duration of the time intervals t t and t - tg is determined by the time required for the motor to reverse the direction of rotation. When setting the command Back (c) from the switch 12 commands Forward back to the input 15 of the controlled inverter 14, the level O arrives. On the command Start (t) this signal is inverted and fed to the input 10 of the Forward-Back signal generation unit 9. At the same time, input 1 of the same block from the BAN 6 block sends a signal 1, which allows the formation of control signals to the block 9 of the Forward-Back signal generation. The motor accelerates backwards. With the Start command, the signal 1 at the output of the BANNER block 6 does not change its state for any combination of signals at the outputs of the sensors 3 and 4 of the direction of rotation. This ensures that the motor reverses when the Forward and Back commands change when the Start, Stop and Motor shaft commands are present. This is ensured in the manner described. The summation of signals Forward sensors 3 and 4 of the direction of rotation are performed by the adder 21, which provides the inversion of control signals by controlled inverter 18. Thus, after turning off the frequency converter. . The magnitude of the shaft movements is determined by the angular area equal to the angular displacement of the sets of sensitive elements of the rotor position sensor. By this, the free movement of the electric motor is eliminated, the time is reduced and the stopping accuracy is improved.

Claims (1)

DEVICE FOR CONTROL OF A VENT ELECTRIC MOTOR, comprising a rotor position sensor with two sets of sensing elements, each of which is connected to a corresponding rotation direction sensor, a comparison unit with two inputs, the first of which is connected to the output of one of the> directional rotation sensors, and a prohibition block. with information and control inputs, a signal generation unit. Forward - backward with control and inhibit inputs, switches co-, mand Forward - backward and Start - stop, the first controlled inverter, an information input connected to the output of the command switch Forward - backward, a control input - to the output of the Start - stop command switch, connected to the control input of the FORBID block, the information input of which is connected to the output of the comparison unit, and the output of the FORBID block is connected to the blocking input of the block Signal generation Forward - backward, with which at least one of the sets of sensing elements of the position sensor is connected, characterized in that, in order to increase accuracy and reduce stop time by using When the rotor is turned off, the valve motor is turned off, the second and third controlled inverters, two four-input totalizers are introduced, the output of the second rotation direction sensor connected to the second input of the comparison unit, the information input of the second inverter connected to the information inlet connected to the output of the first inverter the input of the third inverter, the output of which is connected to the control input of the signal conditioning unit Forward - Backward, the first and second inputs of the adders are connected to the outputs of the first and orogo direction of rotation sensors' respectively, the third inputs of the adders - to the switch output command / Forward - back stop Puskg output commands switch is connected to a fourth input of the adder, each adder output is connected to a control input of one of the input corresponding to this adder, an inverter. I