KR950005520B1 - Non-registor control and monitoring system of wound-rotor induction motor - Google Patents

Abstract

The system includes a central logic controlling and monitoring unit (100) for executing the switching for motor controlling and the ON/OFF of state discriminating circuit to control the contral logic states and receving the feedback signals of speed control states to monitor the speed control states, a speed control unit (200) for controlling the motor speed and rotation direction by the logic states from the unit (100), a current detector (300) for detecting and feeding-back the motor control current according to the output of the unit (200), a three-phase motor (M), a speed generator (TG), and a brake. The system performs zero-resistance-controlling of the motor speed.

Description

Wire-wound motor resistivity control and monitoring system

1 is a schematic block diagram of the present invention.

(A) of FIG. 2 is a schematic block diagram for explaining the speed control system in FIG.

(b) is a detailed circuit diagram of the operation start portion and current adjustment portion in (a) above.

(c) is a detailed circuit diagram of the reference speed control section in (a) above.

(d) is a detailed circuit diagram of the current control section in (a) above.

(e) is a detailed circuit diagram of the automatic switching device in (a) above.

(f) is a detailed circuit diagram of the pulse generator in (a) above.

* Explanation of symbols for the main parts of the drawings

100: monitoring system 200: speed control system

300: current detector M: motor

TG: Speed Generator 10: Start of Operation

20: current adjusting unit 30: reference speed control unit

40: current control unit 50: automatic switching device

60: pulse generator 70: pulse transformer

80: SCR module 90: phase control unit

11: initial operation motor control unit 12: smoothing circuit

31,41: comparator 32: constant output upper limit level adjustment part

33: Negative output upper limit level adjuster 34: Feedback circuit

35, 43, 57: control blocking circuit 42: output unit

51: inversion circuit 52: amplifier

53: control block 54: switch

55: forward output section 56: negative output section

R1 ~ R138: Resistor C1 ~ C46: Capacitor

D1 ~ D54: Diode ZD1 ~ ZD9: Zener Diode

VR1 ~ VR18: Variable resistor

The present invention relates to a winding type motor non-resistance control and monitoring system for controlling the speed of the motor as well as controlling the speed of the motor with no resistance when regulating the speed of the AC three-phase winding type motor in the motor control system.

Various motors that require constant speed, such as hoisting devices, traveling devices, traversing devices of various-capacity various cranes, which have been used up to now, convert a speed by connecting a large capacity resistor to the rotor secondary of the motor during switching. Although it has been driven by the method, such a motor control method has a weak general purpose of use such as applying a separate resistance capacity for each motor, and it is difficult to maintain accurate constant speeds for the surrounding environment where the motor is inevitable, and equipment operation and failure Repair was a fairly complex problem.

Therefore, in view of the above-mentioned problems, the present invention adopts a voltage variable type using a semiconductor device to enable speed control regardless of the winding type or the same type, and to monitor the control state of the motor. The purpose of the present invention is to provide a winding-type motor non-resistance control and monitoring system that can be applied to not only an AC motor but also a DC motor by simply replacing the SCR module of the output.

Hereinafter, a detailed description of the present invention will be described in detail with reference to FIGS. 1 to 2.

1 is a schematic block diagram for explaining the apparatus of the present invention, the central logic control to perform feedback on and control the speed control situation as well as the central logic control by performing the on / off of the switching and state detection device for the motor control And a monitoring system 100, a speed control system 200 for controlling the speed of the motor according to the logic from the monitoring system 100, and a rotation direction, and an output of the speed control system 200. And a current detector 300 for detecting and feeding back a motor control current according to the present invention, a three-phase motor M, a speed generator TG, and a brake device.

(A) of FIG. 2 is a block diagram of a schematic apparatus for explaining the speed control system of FIG. 1 in detail. The criteria for determining a reference value by comparing a lever value and a speed generator (TG) value to adjust a basic speed is shown in FIG. A speed control section 30, an operation start section 10 for adjusting the rise time and the fall time to prevent overcurrent and vibration at the start of operation, and a step-by-step step so that the corresponding current value of the speed determined by the lever is no longer raised By controlling the reference value by differential setting to control the reference value, each phase-falling current adjusting unit 20 limits the current to protect from overcurrent, and if the speed exceeds the set speed during operation, reverse braking maintains the constant speed or automatically changes the direction. The automatic switching device 50 to automatically stop at a predetermined place and the current and speed of each step by the limited current of the current adjusting unit 20 to adjust A current controller 40, a phase controller 90 for downsing the AC 330V three-phase power supply to an AC three-phase 30V, and outputs a signal from the phase controller 90 and a signal from the current controller 40; A pulse generator 60 for generating pulses as an input, a pulse transformer 70 for converting pulses from the pulse generator 60 into SCR gating pulses, and a rotational speed and forward and reverse directions of the motor. It is composed of an SCR module 80 for controlling.

(B) of FIG. 2 is a detailed circuit diagram of the operation start unit 10 and the current adjusting unit 20 in (a) of FIG. 2, by the forward, reverse and speed control levers attached to the cabin controller not shown. The set lever value is input to terminals A and B, and is applied from AC three-phase 440V / 60Hz power supply so that the voltage from the current detector 300 which converts current into voltage and outputs it is fed back to terminal C. The signal output from the reference speed control unit 30 to the automatic switching device 50 when the direction of the motor is switched is applied to the terminal D, and the operation start lever value from the central logic control and monitoring system 100 is changed. The motor during operation by inputting the voltage conversion value of the AC three-phase power inputted to the initial operation motor control unit 11 and the terminals C and D and the direction change signal of the motor as inputs. Suddenly changed signal during over-current The operation start part 10 which consists of the motor speed smoothing circuit 12 which raises and considers an inertia, delays, and outputs the signal which does not overload a load, and the lever value applied to the said terminal B, C, and AC It is composed of a current adjustment unit 20 for limiting and adjusting the current value by dividing the voltage conversion value of the power source into five stages.

FIG. 2 (c) is a detailed circuit diagram of the reference speed controller 30 in FIG. 2 (a). The output from the operation start unit 10 is applied to the terminal A, and the direction of the motor is changed. The signal is applied to the terminal B, the current value of each step is limited, and the output from the current adjusting unit 20, which is adjusted and output, is applied to the terminal D, and the operation start unit input to the terminal A ( A comparator 31 for comparing the signal from 10) with the actual motor speed applied from the speed generator TG to the terminal C, and the upper limit level of the constant output from the comparator 31; An output upper limit level adjusting section 32, a negative output lower limit level adjusting section 33 for adjusting the lower limit level of the negative output from the comparator 31, and a feedback circuit for negative feedback of the output from the comparator 31; (34) and the control block which is driven by the control blocking signal from the automatic switching device 50 at the time of equipment stop to zero the output. The circuit 35 includes a resistor, a capacitor, a diode, and a zener diode, and the output from the reference speed controller 30 is output to the automatic switching device 50 through the terminal E.

(D) of FIG. 2 is a detailed circuit diagram of the current control unit 40 in FIG. 2 (a), in which the reference speed output from the (-) conversion from the automatic switching device 50 is transferred to the terminal A. FIG. The current value applied to the terminal B is applied to the terminal B and is applied to the terminal B. A comparator 41 for comparing signals from the current adjusting unit 20 to be used, an output unit 42 for converting and outputting a speed value signal output from the comparator 41 into a positive value, and at the time of equipment stop It consists of a control blocking circuit 43 which conducts by the control blocking signal output to the automatic switching device 50 and zeros the output, and a resistor, a diode, and a capacitor, and the output of the current control unit 40 is the terminal C. It is applied to the pulse generator 60 through.

FIG. 2 (e) is a detailed circuit diagram of the automatic switching device 50 in FIG. 2 (a). The output from the reference speed controller 30 is applied to the terminals A and B, and the current The inversion circuit 51 which outputs from the adjustment part 20 is applied to the terminal C, and converts the (+) reference speed value input into the said terminal A into (-), and outputs it to the current control part 40. ), An amplifying unit 52 for amplifying the reference speed value input to the terminal B with an OP amplifier having a high amplification rate, and the application of a high current equal to or greater than the step-by-step limited current value input to the terminal C. A control block 53 for zeroing the output of the amplifier 52, a switch 54 for switching the direction of the motor by the reference speed value amplified by the amplifier 52, and the switch By the 54, the forward output section 55 and the negative output section 56, which outputs the reference speed value, and the control blocking switch when the equipment is stopped, The unit consists of a control blocking circuit 57 and a discharge circuit for discharging all outputs to the ground at a high speed during operation of the control blocking circuit 57.

FIG. 2 (f) is a detailed circuit diagram of the pulse generator 60 in FIG. 2 (a), in which the controlled output current from the current controller 40 is applied to the terminal A, and AC 3 Outputs R, T, and S from the trauma control unit 90, which converts the phase 440V into the AC three-phase 30V, are applied to the terminals B1, B2, and B3, respectively, and are output from the central logic control and monitoring system. The operation stop signal of is applied to the terminal C and in accordance with the signal crossing the AC three-phase (R, S, T) phase from the phase controller 90 input from the terminals B1, B2, and B3. Pulse generating ICs 61, 62 and 63 for generating pulse signals of respective phases, sawtooth generating circuit 64 and sawtooth width adjusting circuit 65 connected to the terminals of the pulse generating ICs 61, 62 and 63; The output from each pulse generating IC (61, 62, 63) is connected to the pulse transformer 70 is configured.

The present invention configured as described above will be described in more detail based on the functions and effects as follows.

The start of the operation of the motor control system of the present invention is, for example, when the AC three-phase 440V power is being input to the phase control unit 90, the operation start command is output from the central logic control and monitoring system 100 of the present invention. By opening the blocking capacitor BC shown in (b), the lever value is applied to the reference speed control unit 30, and the lever value is operated by the adjustment of the forward and reverse direction and the speed control lever attached to the cabin controller (not shown). It starts by being applied to the starter 10 and the current adjuster 20.

The operation start section 10 uses the input lever value as data, and first of all, a sudden speed value input by the lever at the first operation start by the initial operation motor control unit 11 shown in FIG. Flexiblely changed and output to the reference speed control unit 30, the lever value required by the reference speed control unit 30 is the direction of the motor suddenly by the motor speed smoothing circuit 12 shown in (b) of FIG. The change in speed is output to the reference speed controller 30 by eliminating the group caused by switching, overcurrent, and inertia of the motor, and delaying the signal appropriately.

The reference speed controller 30 outputs the reference speed by negative feedback by comparing the lever value from the operation start unit 10 with the actual speed from the speed generator TG.

The automatic switching device 50 converts (-) the reference speed from the reference speed control unit 30 as data, outputs it to the current control unit 40 and amplifies it by the amplifying unit, and then adjusts the current adjusting unit 20. When the limit value is exceeded compared to the limit current value from step by step, the output is automatically set to zero, and the output from the amplifier is corrected in the forward and reverse directions. In case of motor speed, output the speed value of motor to reverse output part.

In addition, the automatic switching device 50 is provided with a power discharge circuit for generating a control blocking signal when the equipment is stopped and to quickly discharge all the signals when the control blocking signal is generated.

The current control unit 40 determines the speed by comparing the reference speed value reversely converted from the automatic switching device 50 with the threshold value from the current adjusting unit 20, and cuts off when more current is applied. At this time, all output signals are output as positive signals.

Next, the pulse generator 60 controls the three phases applied from the phase controller 90 and the positive and reverse motor output values switched and output by the automatic switching device 50 and the current controller 43. The pulses in each direction are generated and output to the pulse transformer 70 in comparison with the currents.

In this way, the output pulse is converted into an appropriate value to drive the gate of the SCR by the pulse transformer 70, whereby the SCR is driven to control the speed and direction of the motor as well as the composition arm. The control status of the same motor is fed back to the central logic control and monitoring system 100 so that the voltage, current, and rotational speed of the motor are displayed through the monitoring system, thereby enabling the central monitoring system of the user.

In addition, the system of the present invention for driving the hoisting device, the traveling device, the traverse device and the various motors requiring constant speed of the various cranes can be replaced by using a DC motor if only the AC power supply is replaced. It worked out that it works without any problem.

As described above, the winding-type resistanceless motor control and monitoring system of the present invention has a low general purpose of use, such as applying a separate resistance capacity to each motor in the conventional motor control method, and the environment in which the motor is inevitable. It is difficult to maintain accurate constant speed, and it is difficult to operate the equipment and repair the trouble. Also, it is possible to control the speed of the motor with no resistance when adjusting the speed of AC three-phase winding type motor and to monitor the control situation. In addition to the use of multiple semiconductor devices, the voltage-variable type is adopted to enable speed control regardless of winding type or squirrel type, and to be applied to DC motor as well as AC motor by simply replacing the output SCR module. There is an effect to make this possible.

Claims (7)

Central logic control and monitoring system (100) for performing the monitoring and feedback of the speed control situation as well as the central logic control by performing the on / off of the switching and state detection device for motor control, and from the monitoring system 100 A speed control system 200 for controlling the speed of the motor according to logic as well as controlling the rotation direction, a current detector 300 for detecting and feeding back the motor control current according to the output of the speed control system 200; Winding motor non-resistance control and monitoring system consisting of three-phase motor (M), speed generator (TG) and brake device. The speed control system 200 of claim 1, wherein the speed control system 200 compares a lever value and a speed generator (TG) value to determine a reference value in order to adjust a basic speed, and an overcurrent and vibration at the start of operation. In order to prevent the overcurrent by controlling the reference value by differential setting step by step so that the corresponding current value of the speed determined by the lever no longer rises, and the operation start section 10 to adjust the rise time and fall time to prevent the Each step-off current adjusting unit 20 to limit the current, and automatic switching device to maintain the constant speed by reverse braking or to change the direction automatically when the speed exceeds the predetermined speed during operation, to automatically stop at the desired place automatically. 50, the current controller 40 for adjusting the current value and speed for each step by the limited current of the current controller 20, and down the AC 330V three-phase power supply to AC three-phase 30V. A phase controller 90 for turning on and outputting a pulse, and a pulse generator 60 for generating pulses by inputting signals from the phase controller 90 and signals from the current controller 40, and the pulse generator Winding motor non-resistance control and monitoring system consisting of a pulse transformer 70 for converting the pulse from the (60) to an SCR gating pulse, and an SCR module 80 for controlling the rotational speed and the forward and reverse directions of the motor. . According to claim 2, wherein the operation start unit 10 and the current adjusting unit 20 is a lever value set by the forward, reverse and speed control lever attached to the cabin controller is input to the terminals (A, B), AC 3 Since it is applied from the phase 440V / 60Hz power supply, the voltage from the current detector 300 which converts the current into a voltage and outputs it is fed back to the terminal C, and is automatically switched when changing the direction of the motor from the reference speed controller 30. The signal output to the device 50 is applied to the terminal (D), and applied to the blocking contactor (BC) and the terminal (A), which are opened at the start of operation from the central logic control and monitoring system (100). The initial operation motor control unit 11 which outputs the initial drawing motor control signal by inputting the lever value, and the voltage conversion value of the AC three-phase power inputted to the terminals C and D and the direction change signal of the motor as inputs. During the rapid change of the motor during operation, It is applied to the operation start part 10 consisting of the motor speed smoothing circuit 12 which raises the delay in consideration of the current or the inertia of the motor and outputs a signal that does not overload the load, and the terminals B and C. Winding motor non-resistance control and monitoring system consisting of a current adjustment unit 20 for limiting and adjusting the current value divided into five stages by inputting the lever value and the voltage conversion value of the AC power. According to claim 2, The reference speed control unit 30 is the output from the operation start unit 10 is applied to the terminal (A), the direction change signal of the motor is applied to the terminal (B), each step The current value is limited and the output from the regulated output current adjusting unit 20 is applied to the terminal D, and the signal and the speed generator TG from the operation start unit 10 inputted to the terminal A. Comparator 31 for comparing the actual motor speed applied from the terminal to the terminal C, a constant output upper limit level adjusting unit 32 for adjusting the upper limit level of the constant output from the comparator 31, and the comparator ( 31, a negative output lower limit level adjusting section 33 for adjusting the lower limit level of the negative output from the negative output, a feedback circuit 34 for negative feedback of the output from the comparator 31, and an automatic switching device at the time of equipment stop ( A control block circuit 35 and a resistor, a capacitor, Diode and Zener diode, the output from the reference speed control unit 30 is a wire-type motor non-resistance control and monitoring system that is output to the automatic switching device 50 through the terminal (E). According to claim 2, wherein the current control unit 40 is applied to the terminal (A) is applied to the reference speed output by the negative (-) conversion from the automatic switching device 50, step-by-step from the current adjustment unit 20 outputs The current value is applied to the terminal B, and the signal from the automatic switching device 50 applied to the terminal A is compared with the signal from the current adjusting unit 20 applied to the terminal B. Comparator 41, an output unit 42 for converting and outputting a speed value signal output from the comparator 41 into a positive value, and a control blocking signal output to the automatic switching device 50 when the equipment is stopped. It consists of a control block circuit (43) and a resistor, a diode, a capacitor to conduct the output to zero, and the output of the current control unit 40 is applied to the pulse generator 60 through the terminal (C) Wire-wound motor resistivity control and monitoring system. 3. The automatic switching device 50 according to claim 2, wherein an output from the reference speed control unit 30 is applied to the terminals A and B, and an output from the current adjusting unit 20 to the terminal C. An inverting circuit 51 that is applied and converts the (+) reference speed value input to the terminal A to (-) and outputs it to the current control unit 40, and the reference speed value input to the terminal B Amplification unit 52 for amplifying a high amplification factor into an OP amplifier having a high amplification rate, and a control blocker for zeroing the output of the amplification unit 52 when a high current equal to or greater than the step-by-step limiting current value input to the terminal C is applied. (53), the switching unit 54 for switching the direction of the motor by the reference speed value amplified by the amplifier 52, and the positive direction is switched by the switching unit 54 outputs the reference speed value An output unit 55 and a sub-direction output unit 56, a control blocking circuit 57 for operating the control blocking switch when the equipment is stopped to block the output; Blocking control circuit 57. Power-on the linear motor with no resistance control, and monitoring system volume that consists of tert-discharge circuit for discharging at a high speed all the output to ground. 3. The pulse generator of claim 2, wherein the pulse generator 60 is supplied with a controlled output current from the current controller 40 to the terminal A, and converts an AC three-phase 440V into an AC three-phase 30V and outputs it. Outputs R, T, and S from the control unit 90 are applied to the terminals B1, B2, and B3, respectively, and an operation stop signal from the central logic control and monitoring system is applied to the terminal C. Pulse generation IC 61 for generating a pulse signal of each phase in accordance with a signal crossing the AC three-phase (R, S, T) phase from the phase controller 90 input from the terminals B1, B2, B3. 62,63, a sawtooth wave generating circuit 64 and a sawtooth wave width adjusting circuit 65 connected to the terminals of the pulse generating ICs 61, 62 and 63, and each of the pulse generating ICs 61, 62 and 63; The output from) is a winding type resistive motor control and monitoring system which is connected to the pulse transformer (70).