CN2744064Y

CN2744064Y - Controller for electric machine

Info

Publication number: CN2744064Y
Application number: CN 200420068225
Authority: CN
Inventors: 刘琼
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-07-26
Filing date: 2004-07-26
Publication date: 2005-11-30
Anticipated expiration: 2014-07-26

Abstract

The utility model relates to a control device for an electric machine, which is suitable for the control of the electrical machines for lifting hoisting equipment and other electromechanical equipment which needs to do forward and reverse rotation and has the request of the control of positions and strokes. Specially, the control device for an electric machine does optimum design for the distribution and control of electric appliances; when the electrical machine is controlled to do forward or reverse rotation, the powers of the electrical machine all pass through the main contacts of two contactors, and when the two contactors are switched on, a time difference exists; in addition, a power-down device and an automatic switch are both arranged on the front ends of the two contactors; when the control device for an electric machine is used for controlling the above equipment, even through the contact of the main circuit of a plurality of contactor is stuck by fusion welding when starting or appears time release after closing down, the control device for an electric machine can use a button or the automatic switch to close down according to a normal operating program, which reliably controls the accidents caused by the incontrollable equipment when the contact of the main circuit of a plurality of contactor is stuck by fusion welding when starting or appears time release after closing down. The device is simple.

Description

The control device of motor

Technical field the utility model relates to a kind of control device of electromechanical equipment motor.

Background technology is existing, and need the to hoist hoisting equipment of decline maybe need be done rotating and the position be arranged or machinery that stroke requires, the general employing of its motor control assembly setting shown in Figure 1: the major control element that device adopts is control button SB1, SB2, SB3 and A.C. contactor KM1, KM2, automatic switch SQ1, SQ2, when pressing control button SB2 or SB3, the coil of contactor KM1 or KM2 gets, it often opens the main contacts closure, and motor is done counter-rotating forward or backwards; When equipment need be shut down, certain parts of pressing SB1 or equipment run to certain position disconnected closed automatic switch SQ, can cut off contactor KM1 or KM2 coil power, and make it often open main contacts and unclamp, motor outage stall, equipment can be out of service.This device is at power supply, circuit, each contact of circuit electrical equipment is all reliable, when electric equipment products adhere to specification, in theoretical and practicality all is feasible, but have following two kinds of situations to be difficult to avoid in actual use: first three-phase line is disconnected mutually in startup or in service, though or the end disconnects but (the loosening or lead of wiring pile crown on a certain appliance switch that inputs or outputs that a phase power supply reduces in the circuit, the conductor loose contact), other two-phase current will increase, the main contact of its KM1 or KM2 is connected moment (when particularly bringing onto load starts) at circuit, wherein the very big starting current that passes through of certain two contact or a contact can become bigger, the high heat that powerful electric current causes makes the main contact melting welding of KM1 or KM2 deadlocked (contactor KM1 or KM2 can not be unclamped when coil blackout automatically to be resetted) easily; It two is existing contactors that are used for this device; circuit breaker (particularly ting model) also exists shuts down the back and the possibility (being that its make contact can not disconnect at once behind the coil blackout) that time-delay discharges occurs; as shown in Figure 1: no matter above-mentioned two kinds of situations occur any; when pressing SB1 or SQ automatic disconnection; the operation of equipment can not stop; this situation: when hoisting equipment runs to the high-low limit position; equipment is rushed to summit or disorder cable; when the parts of lathe or miscellaneous equipment run to the front and back dead-centre position; can cause that beyond thought fault appears in equipment, this type of problem is not rare in production reality.

" control device of motor " application number 96224789, the 8 notification number CN2311889Y that obtained national patent have solved this device and also can effectively control equipment when main noddle on contactor melting welding is deadlocked; but for (discharge as KA1 or KA2 appearance time-delay, press SB1 or SQ1, SQ2 automatic disconnection the operation of equipment is stopped) occurring effectively to control equipment when time-delay discharges as certain relay or contactor shutdown back in the device.

It is deadlocked or when time-delay occurring discharging after shutdown that the purpose of this utility model is to provide a kind of a certain contactor that had both made the control motor rotation main contact melting welding to occur; stop the running of motor in the time of also working, with the control device of the motor of guaranteeing the electromechanical equipment safe operation with control button or automatic switch.

Summary of the invention technical solution of the present utility model is: the main control apparatus element that adopts of this device has fuse FV1, FV2, isolating switch QS, A.C. contactor KM, KM1, KM2, thermal relay FR, push-button switch SB1, SB2, SB3, and its connected mode is: the main contact that the three phase mains ABC that the control motor is just changeing inserts FV1, QS, KM, KM1, FR successively inserts afterwards motor again; The wiring of the three phase mains of control motor counter-rotating be between the wiring of KM and KM1 main contact, draw after, insert an end of KM2 main contact, again between KM2 main contact other end commutation access KM1 main contact and the wiring of thermal relay main contact; Control A.C. contactor KM, KM1, the KM2 main contact, the auxiliary contact of thermal relay FR main contact action with the connection of element is: draw mutually after a wiring is connected in series fuse FV2 at B under the isolating switch QS, insert the end of moving disconnected stop button SB1 again, the other end of SB1 connects the moving start button SB2 that closes respectively, an end and the KM1 of SB3, one end of one group of auxiliary normally opened contact of KM2, SB2 other end string inserts the one group of other end and one group of end of assisting normally-closed contact of KM2 of assisting normally opened contact that KM1 is connected with SB1 respectively after assisting normally-closed contact by one group of KM again, and an end has connected the auxiliary normally open contact of KM1 and KM assists the KM2 of normally closed interlock to assist the other end of normally closed interlock, insert an end of KM1 coil on the string behind the position switch S Q1; Insert the other end of one group of normally opened contact that KM2 is connected with SB1 and one group of end of assisting normally-closed contact of KM1 behind one group of auxiliary normally-closed contact of SB3 other end serial connection KM more respectively; One end has connected an end that inserts the KM2 coil behind the other end, serial connection position switch SQ2 of the KM1 normally closed interlock of the auxiliary normally closed interlock of the auxiliary normally opened contact KM of KM2; End at the KM coil is drawn two wiring, insert an end of the KM2 coil that has inserted the SQ2 wiring behind one group of auxiliary normally opened contact of one wiring serial connection KM2 again, insert an end of the KM1 coil that has inserted the SQ1 wiring behind one group of auxiliary normally opened contact of another wiring serial connection KM1 again; Because C inserts KM1, KM, the not wired other end of KM2 coil respectively after drawing another wiring serial connection FV2 and FR temperature-sensitive contact mutually again under the isolating switch QS.

The utility model is owing to adopted above technical scheme; device has all passed through two contactors when making motor energized forward or reverse in Circuit Design main contact (passes through KM1, KM when just changeing; pass through KM2, KM during counter-rotating); and when being connected, two contactors arranged a time difference; two position switch SQ is provided with the action front end of two ac contactor coils of control forward or reverse respectively, and main contact melting welding to occur deadlocked or shut down the back and time-delay occurs and discharge the power supply that all can cut off motor when pressing stop button SB1 or SQ automatic disconnection when any contactor wherein.The utility model all is provided with interlocking, the self-locking that device is equipped with the operation sequence requirement in addition.

Appended drawings 1 is that existing hoisting equipment or other need be done rotating and have the position or electric elements that the control device of the electromechanical equipment that Stroke Control requires adopts distribute and connection layout.Accompanying drawing 2 is that the utility model need be made the electromechanical equipment of rotating and have the position or the electric elements distribution and the connection layout of the control device employing that Stroke Control requires hoisting equipment or other.

Embodiment such as accompanying drawing 2 when equipment need just change, the QS that closes, are pressed SB2, the KM1 coil gets by the auxiliary normally-closed contact of KM, KM2, SQ1, KM1 normally opened contact closure, wherein one group of auxiliary normally opened contact closure makes the KM1 coil get electric being maintained, i.e. self-locking, another auxiliary normally opened contact closure gets the KM coil, the KM coil get electric after, make KM normally opened contact closure, main circuit power was connected also and was maintained this moment, motor obtains three phase mains, begins to start just transporting row; From as can be known above-mentioned: motor is just changeing start-up course, its control apparatus SB2-KM1-KM in order moves, and each control apparatus all has a time difference at attracting process, connection elder generation and the KM of KM1, being the KM1 main contact does not connect when non-loaded switching on, when main noddle on contactor during in adhesive melting welding deadlocked, deadlocked can be KM only, as long as at this moment press SB1 or SQ1 is opened automatically, when the KM1 coil losing electricity, each contact of KM1 automatically resets, and can cut off main circuit power in the same old way, and the motor operation is stopped; The release of delaying time appears as for a certain contactor is shut down the back: no matter be that KM occurs or KM1 occurs, opened automatically when pressing SB1 or SQ1, and KM1 and the equal dead electricity of KM coil, release just can be cut off main power source as long as time-delay does not appear in one of them contactor; Counter-rotating or decline to equipment: in the right-hand part of Fig. 2 assist control circuit, press SB3, the KM2 coil passes through KM, KM1, the auxiliary normally-closed contact of SQ2 gets, KM2 normally opened contact closure, wherein one group of auxiliary normally opened contact closure makes the KM2 coil get electric being maintained, another auxiliary normally opened contact closure gets the KM coil, the KM coil get electric after, make KM normally opened contact closure, motor obtains three phase mains, begin to start to do to reverse and move, the connection of control apparatus is SB3-KM2-KM in proper order, and it is KM2-KM that main circuit is connected job order, connection elder generation and the KM of KM2, being the KM2 main contact does not connect when non-loaded switching on, and it is deadlocked or shut down the back time-delay and discharge that main contact melting welding is appearred in a certain contactor; Press SB1 or SQ2 and opened automatically, KM2 and the equal dead electricity of KM coil, KM2 and KM coil electricity always have one can disconnect main power source, promptly press SB3 and make equipment counter-rotating or decline operation principle and press SB2 and equipment is just being changeed operate the same.Interlocking as for each control program: when equipment just changes, contactor KM1 connects, the auxiliary normally-closed contact of KM1 disconnects, make the current channel of control motor counter-rotating obtain disconnection, the connection of contactor KM2 makes the auxiliary normally-closed contact outage of KM2 when equipment reverses, the power channel that the control motor is just changeing has obtained disconnection, and the auxiliary normally-closed contact of KM disconnects when the melting welding of KM contact is deadlocked, makes the current channel of control motor positive and inverse all obtain disconnection.

As can be known above-mentioned; the utility model can accurately be controlled the starting of rotating electromechanical equipment and stop; and can prevent effectively in the control device that a certain main noddle on contactor melting welding is deadlocked or shut down the back occurs the equipment accident that causes out of control occurring when time-delay discharges, and installs simple and practically, and using value is arranged very much.

Claims

1, a kind of control device of motor, the three phase mains ABC that its control motor is just changeing inserts FV1 successively, QS, KM1, insert motor after the main contact of FR again, the wiring of the three phase mains of control motor counter-rotating is after the upper end of KM1 main contact power supply tie-in line is drawn, insert an end of KM2 main contact, insert between KM1 main contact and the wiring of thermal relay FR main contact from the commutation of the KM2 main contact other end again, control A.C. contactor KM1, the KM2 main contact, the auxiliary contact of thermal relay FR main contact action and the connection of element are to draw mutually after a wiring is connected in series fuse FV2 at B under the isolating switch QS, insert the end of moving disconnected stop button SB1 again, the other end of SB1 connects the moving start button SB2 that closes respectively, an end and the KM1 of SB3, one end of one group of auxiliary normally opened contact of KM2, the other end of the auxiliary normally open contact of KM1 links to each other with one group of auxiliary normally closed interlock of KM2, insert an end of KM1 coil on the other end string of the auxiliary normally closed interlock of KM2 behind the switch S Q1 of position, the auxiliary normally opened contact of another group of KM2 links to each other with one group of auxiliary normally-closed contact of KM1, insert an end of KM2 coil behind the other end serial connection position switch SQ2 of KM1 normally closed interlock, insert KM1 more respectively after drawing another wiring serial connection FV2 and FR temperature-sensitive contact mutually by C under the isolating switch QS, the not wired other end of KM2 coil, it is characterized in that: between isolating switch QS and A.C. contactor KM2 power access end, be provided with A.C. contactor KM, one group of auxiliary normally closed interlock of KM is connected across the lower end of moving disconnected stop button SB2 and a group of KM2 is assisted between the normally-closed contact upper end, the auxiliary normally closed interlock of another group of KM is connected across the lower end of moving disconnected stop button SB3 and a group of KM1 is assisted between the normally-closed contact upper end, end at the KM coil is drawn two wiring, wherein insert the lower end of SQ2 behind one group of auxiliary normally opened contact of wiring serial connection KM2 again, insert the lower end of SQ1 behind one group of auxiliary normally opened contact of another wiring serial connection KM1 again, the other end of KM coil and KM1, the bus of KM2 links to each other.