CN201616801U

CN201616801U - Crane controller

Info

Publication number: CN201616801U
Application number: CN2010201136792U
Authority: CN
Inventors: 毕东
Original assignee: DALIAN SHENTONG ELECTRICAL Co Ltd
Current assignee: DALIAN SHENTONG ELECTRICAL Co Ltd
Priority date: 2010-02-11
Filing date: 2010-02-11
Publication date: 2010-10-27
Anticipated expiration: 2020-02-11

Abstract

The utility model discloses a crane controller, which controls trigger signals of five groups of bidirectional thyristors (1-5SCR) through two groups of positive and negative signals, the two groups of signals are mutually controlled to convert through relay contacts, the relay contacts are respectively serial on two groups of trigger signals, thereby controlling a power supply of the two groups of trigger signals to make and break, and achieving the purpose of reversing. The controller has the characteristics of no-contact reversing, simple circuit, small volume, low cost, and excellent effect. The turn on and turn off time of the bidirectional thyristors is extremely short, and the starting response of a no-contact reversing motor is rapid. Furthermore, because the structure of the crane controller is simple, the production is convenient, the cost is extremely low, and the crane controller is suitable for being widely popularized.

Description

The bridge motor controller

Technical field

The utility model relates to a kind of crane controller, relates in particular to a kind of bridge motor controller of contactless commutation.

Background technology

At present, no matter hoisting equipment electrical control in the prior art is the contact control system that interchange or direct current mostly adopt the contactor mode, and control falls behind, and circuit is messy, the failure rate height, and difficult in maintenance, it has mainly showed:

(1) act frequently, probe of contactor and coil often burn out, and cause that circuit catches fire when serious, or cause the contact adhesion, and security incidents such as substantial equipment damage take place.

(2) because oscillation intensity causes contactor greatly, relay mechanical part spoilage is high.

(3) to quicken be to rely on controller or by time relay control to motor, causes motor to start under several times the rated current of being everlasting, and the plug braking electric current is also very big, and burning motor is matter of frequent occurrence.

(4) motor does not have any other protection except that overcurrent protection, and motor is in operation under the overload, the high serious threat production of carbon brush for electric machine and slip ring spoilage for a long time.

(5) motor is everlasting and is moved under the big current condition, and not only mechanical shock is big, and power consumption is surprising.

Summary of the invention

The utility model is at the proposition of above problem, and develops conducting and the shutoff that a kind of employing carries the thyristor control circuit of zero cross fired device, realized the bridge motor controller of control device of electric motor contactless commutation.The scheme that adopts is that (1 ~ 5SCR) triggering signal is by positive and negative two groups of signal controlling with five groups of bidirectional thyristors, the conversion of two groups of signals is by relay contact interlocking control, relay contact seals in respectively on two groups of triggering signal power supplys, control two groups of triggering signal on/offs, realize the purpose of commutation.Major loop phase fault when preventing to commutate, controller triggers thyristor SCR by time-delay in the line, reaches the purpose of protection.Get 3 phase incoming powers respectively and enter into supply voltage detection loop, if phase shortage takes place, relay sends alarm signal, light-emitting diode conducting, newspaper open-phase fault.The technological means that the utility model adopts is as follows:

A kind of bridge motor controller comprises outside forward and reverse control signal input unit and power module KD; It is characterized in that circuit is along the coil of relay J 1 when outside forward control signal is imported, the normally closed switch of relay J 2 and resistance R 2 give capacitor C 2 chargings, when the voltage of capacitor C 2 reaches the condition that makes transistor T 1 work, the loop is along resistance R 3, transistor T 1 and resistance R 5 conductings, make transistor T 2 work simultaneously, circuit is along transistor T 2, resistance R 6 triggers thyristor SCR gets the coil of relay J 1, the normal open switch closure of control loop repeat circuit J1, in addition, the normal open switch closure of relay J 1 is connected to bidirectional thyristor 1SCR, the control utmost point of bidirectional thyristor 2SCR and bidirectional thyristor 3SCR makes the operation of major loop conducting motor forward; Circuit is along the coil of relay J 2 when outside reverse control signal is imported, the normally closed switch of relay J 1 and resistance R 2 give capacitor C 2 chargings, when the voltage of capacitor C 2 reaches the condition that makes transistor T 1 work, the loop is along resistance R 3, transistor T 1 and resistance R 5 conductings, make transistor T 2 work simultaneously, circuit is along transistor T 2, resistance R 6 triggers thyristor SCR gets the coil of relay J 2, the normal open switch closure of control loop repeat circuit J2, in addition, the normal open switch closure of relay J 2 is connected to bidirectional thyristor 1SCR, the control utmost point of bidirectional thyristor 4SCR and bidirectional thyristor 5SCR makes major loop conducting motor inverted running.

Comprise that also supply voltage detects the loop and is connected to 3 phase incoming power U, V, on the W, circuit is along resistance VR, diode D8, resistance R 8 is connected on the capacitor C 5, described capacitor C 5 connects with voltage-stabiliser tube D9, circuit is along resistance VR when phase shortage takes place, diode D8, transistor T 1 conducting that links to each other with voltage-stabiliser tube D9 when resistance R 8 reaches voltage-stabiliser tube D9 reverse breakdown voltage for capacitor C 5 charging voltages, relay J 3 coils that allomeric pipe T1 links to each other get, at this moment relay J 3 normal open switch closures make the light-emitting diode D10 energising that is connected on the power module KD, and relay J 3 normally closed switchs are opened and made power module KD stop to power to controller.

The coils from parallel connection of coils of described relay J 1 has diode D1, and the coils from parallel connection of coils of described relay J 2 has diode D2.

Described thyristor 1SCR, thyristor 2SCR, thyristor 3SCR, thyristor 4SCR and thyristor 5SCR carry zero cross fired device and resistance-capacitance protection device.

Whole crane control circuit is made of contactless commutation circuit, three-phase imbalance detection loop and main loop circuit.Have contactless commutation, circuit is simple, volume is little, cost is low, good effectiveness.The thyristor conducting turn-off time is very short, and it is fast that contactless commutated motor starts reaction.In addition,, not only be convenient to produce, and cost is very cheap is suitable for extensive popularization because it is simple in structure.

Description of drawings

Fig. 1 is contactless commutation control and the protective circuit figure of the utility model embodiment;

Fig. 2 is the contactless commutation main loop circuit figure of the utility model embodiment.

Embodiment

This controller can adopt case structure as illustrated in fig. 1 and 2, interior dress radiator, thyristor module and control circuit board.The contactless commutation of controller control bridge motor is realized by following scheme, does specifying in conjunction with the accompanying drawings.Control principle figure as shown in Figure 1, the 220VAC inlet wire is put in order out DC24V by switch power module KD, DC power supply is along the normally closed point of relay J 3, seals in outside positive and negative two groups of input control signals.When the forward input control signal is closed (switches at closed as shown in Figure 1 pin 2 places); circuit is along the coil of relay J 1 (playing the effect protection relay coil of afterflow with the diode D1 of the coils from parallel connection of coils of relay J 1); normally closed switch of relay J 2 (that is: normally closed interlocking point) and resistance R 2 give capacitor C 2 chargings; when the voltage of capacitor C 2 reaches the condition that makes transistor T 1 work; the loop is along resistance R 3; transistor T 1 and resistance R 5 conductings; make transistor T 2 work simultaneously; circuit is along transistor T 2; resistance R 6 triggers thyristor SCR; the coil of relay J 1 is got; the normal open switch closure of control loop repeat circuit J1 (being relay J 1 self-locking) is simultaneously with the timing circuit bypass.The closed control utmost point that triggers two-way bidirectional thyristor 1SCR, bidirectional thyristor 2SCR and bidirectional thyristor 3SCR of the normal open switch of relay J 1 makes the major loop conducting, the major loop schematic diagram as shown in Figure 2, the operation of motor forward.The coil losing electricity of relay J 1 when outside reverse control signal input (switches at closed as shown in Figure 1 pin 3 places); circuit is along the coil of relay J 2 (playing the effect protection relay coil of afterflow with the diode D2 of the coils from parallel connection of coils of relay J 2); normally closed switch of relay J 1 (that is: normally closed interlocking point) and resistance R 2 give capacitor C 2 chargings; when the voltage of capacitor C 2 reaches the condition that makes transistor T 1 work; the loop is along resistance R 3; transistor T 1 and resistance R 5 conductings; make transistor T 2 work simultaneously; circuit is along transistor T 2; resistance R 6 triggers thyristor SCR gets the coil of relay J 2; the normal open switch closure of control loop repeat circuit J2; the normal open switch closure of relay J 2 is connected to bidirectional thyristor 1SCR; the control utmost point of bidirectional thyristor 4SCR and bidirectional thyristor 5SCR; make major loop conducting motor inverted running; at this moment bidirectional thyristor 4SCR and bidirectional thyristor 5SCR are with the phase sequence commutation of bidirectional thyristor 2SCR and bidirectional thyristor 3SCR; the motor inverted running, capacitor C 3 plays jamproof effect.

In addition, get 3 phase incoming power U, V, W respectively and enter into supply voltage and detect the loop, if phase shortage takes place, circuit along resistance VR, diode D8, resistance R 8, give capacitor C 5 chargings.When voltage reaches voltage-stabiliser tube D9 reverse breakdown voltage, transistor T 1 conducting, relay J 3 coils get electric, and the alarm circuit self-locking, send alarm signal, and light-emitting diode D10 conducting is luminous.

The above; it only is the preferable embodiment of the utility model; but protection range of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; be equal to replacement or change according to the technical solution of the utility model and inventive concept thereof, all should be encompassed within the protection range of the present utility model.

Claims

1. a bridge motor controller comprises outside forward and reverse control signal input unit and power module KD; It is characterized in that circuit is along the coil of relay J 1 when outside forward control signal is imported, the normally closed switch of relay J 2 and resistance R 2 give capacitor C 2 chargings, when the voltage of capacitor C 2 reaches the condition that makes transistor T 1 work, the loop is along resistance R 3, transistor T 1 and resistance R 5 conductings, make transistor T 2 work simultaneously, circuit is along transistor T 2, resistance R 6 triggers thyristor SCR gets the coil of relay J 1, the normal open switch closure of control loop repeat circuit J1, in addition, the normal open switch closure of relay J 1 is connected to bidirectional thyristor 1SCR, the control utmost point of bidirectional thyristor 2SCR and bidirectional thyristor 3SCR makes the operation of major loop conducting motor forward; Circuit is along the coil of relay J 2 when outside reverse control signal is imported, the normally closed switch of relay J 1 and resistance R 2 give capacitor C 2 chargings, when the voltage of capacitor C 2 reaches the condition that makes transistor T 1 work, the loop is along resistance R 3, transistor T 1 and resistance R 5 conductings, make transistor T 2 work simultaneously, circuit is along transistor T 2, resistance R 6 triggers thyristor SCR gets the coil of relay J 2, the normal open switch closure of control loop repeat circuit J2, in addition, the normal open switch closure of relay J 2 is connected to bidirectional thyristor 1SCR, the control utmost point of bidirectional thyristor 4SCR and bidirectional thyristor 5SCR makes major loop conducting motor inverted running.

2. crane controller according to claim 1, it is characterized in that also comprising that supply voltage detects the loop and is connected to 3 phase incoming power U, V, on the W, circuit is along resistance VR, diode D8, resistance R 8 is connected on the capacitor C 5, described capacitor C 5 connects with voltage-stabiliser tube D9, circuit is along resistance VR when phase shortage takes place, diode D8, transistor T 1 conducting that links to each other with voltage-stabiliser tube D9 when resistance R 8 reaches voltage-stabiliser tube D9 reverse breakdown voltage for capacitor C 5 charging voltages, relay J 3 coils that allomeric pipe T1 links to each other get, at this moment relay J 3 normal open switch closures make the light-emitting diode D10 energising that is connected on the power module KD, and relay J 3 normally closed switchs are opened and made power module KD stop to power to controller.

3. crane controller according to claim 2 is characterized in that the coils from parallel connection of coils of described relay J 1 has diode D1, and the coils from parallel connection of coils of described relay J 2 has diode D2.

4. crane controller according to claim 1 is characterized in that described bidirectional thyristor 1SCR, bidirectional thyristor 2SCR, bidirectional thyristor 3SCR, bidirectional thyristor 4SCR and bidirectional thyristor 5SCR carry zero cross fired device and resistance-capacitance protection device.