CN207766161U - A kind of noise measuring braking system of direct current generator - Google Patents

Abstract

The utility model is related to a kind of noise measuring braking systems of direct current generator, the system includes motor, Exciting Windings for Transverse Differential Protection, discharge load, relay, noise detection unit and brak control unit, the noise of the noise detection unit detection motor running and the control coil for connecting relay, the brak control unit includes starting button, stop button, first contactor, second contactor, third contactor and braking resistor, first contactor, second contactor coordinates the relay by noise detection unit controller with third contactor, realize the starting process of motor, reversing braking set-up procedure and reversing braking process.Compared with prior art, the utility model solves speed control principle and there is operation and inevitable drawback difficult to install, while overcoming the control inaccuracy defect of current time control principle, not only power saving, but also has saved equipment cost.

Description

A kind of noise measuring braking system of direct current generator

Technical field

The utility model is related to engineering electrical apparatus fields, more particularly, to a kind of noise measuring braking system of direct current generator System.

Background technology

Reversing braking is a kind of mode of braking of motor, it makes motor generate the anti-of retardation by reversal connection phase sequence Torque is so as to braking motor.In process of production, it is often necessary to which taking some measures makes motor stall as early as possible, or high from certain Prompt drop is supported on steady running under a certain rotating speed to certain low-speed running, or limitation potential energy, and here it is the brakings of motor to ask Topic.Realizing braking, there are two types of method, mechanical braking and electromagnetic brakings.Electromagnetic braking is to make motor generate in braking to rotate The opposite electromagnetic torque in direction, its main feature is that braking moment is big, convenient operation and control.

Engineering electrical slewing at present（Such as direct current generator）Reversing braking in traditional electric braking, through frequently with speed Spend the principle of sensor（Speed principle）Control or the time relay（Time principle）Control etc..

Using the principle of velocity sensor（Speed principle）Control：Need to be co-axially mounted velocity sensor, installation accuracy and More demanding, equipment price is expensive.

The time relay（Time principle）Control：The reasonable braking time of distinct device system requirements is different, and causing cannot Realize accurate braking.

Utility model content

The purpose of this utility model is exactly to provide a kind of direct current generator to overcome the problems of the above-mentioned prior art Noise measuring braking system, solve background technology medium velocity Controlling principle and there is operation and inevitable disadvantage difficult to install End, while the control inaccuracy defect of current time control principle, not only power saving are overcome, but also saved equipment cost.

The purpose of this utility model can be achieved through the following technical solutions：

A kind of noise measuring braking system of direct current generator, including motor, Exciting Windings for Transverse Differential Protection, discharge load, relay, make an uproar Sound detection unit and brak control unit, the noise of the noise detection unit detection motor running and the control for connecting relay Coil processed, if noise is more than setting valve, the control signal of output control relay work, the brak control unit includes starting Button, stop button, first contactor, second contactor, third contactor and braking resistor, the third contactor it is normally closed Contact one end be separately connected the anode of input power, one end of braking resistor, one end of Exciting Windings for Transverse Differential Protection, discharge load one end, Normally closed one end, opened point one end of stop button and normally-closed contact one end of relay of stop button, third contactor The normally-closed contact other end is separately connected the other end of braking resistor, first normally opened contact one end of second contactor and the first contact First normally opened contact one end of device, the first normally opened contact other end of the second contactor be separately connected motor one end and Second normally opened contact one end of first contactor, what the other end of the motor was separately connected first contactor first normally opened touches Second normally opened contact one end of the point other end and second contactor, the second normally opened contact other end difference of the first contactor The cathode of connection input power, ground terminal, the second normally opened contact other end of second contactor, the other end of Exciting Windings for Transverse Differential Protection, electric discharge The other end of load, control coil one end of first contactor, control coil one end of second contactor and third contactor Control coil one end, normally-closed contact one end of the control coil other end connection second contactor of the first contactor are described Opened point one end of the normally-closed contact other end connection starting button of second contactor, the opened point other end of the starting button It is separately connected the normally closed other end of stop button and normally closed one end of starting button, the normally closed point of the starting button is another End is separately connected first normally-closed contact one end of first normally opened contact one end and first contactor of third contactor, the third The opened point other end of the first normally opened contact other end connection stop button of contactor, the first of the first contactor are normally closed The control coil other end of contact other end connection second contactor, the control coil other end connection of the third contactor the The second normally-closed contact other end of second normally-closed contact one end of one contactor, the first contactor connects the normally closed of relay The contact other end.

The noise detection unit includes that noise transducer, cell operation power supply, pull-up resistor, voltage-stabiliser tube, voltage compare Device and switching tube, close on motor, the anode of the cell operation power supply is separately connected the noise transducer One end of pull-up resistor and control coil one end of relay, the other end of the pull-up resistor be separately connected voltage-stabiliser tube cathode and The positive input terminal of voltage comparator, the output end of the negative input end connection noise transducer of the voltage comparator, voltage compare The control terminal of the output end connecting valve pipe of device, the control coil other end of the first end connection relay of the switching tube, is opened The second end for closing pipe is separately connected the anode of voltage-stabiliser tube, the cathode of cell operation power supply and ground terminal.

The switching tube is NPN triode.

Control terminal of the output end of the voltage comparator through current-limiting resistance connecting valve pipe.

There are one the diodes of reversal connection for the control coil both ends parallel connection of the relay.

The both ends of the opened point of the starting button are parallel with the third normally opened contact of first contactor, the stop button The both ends of opened point be parallel with the third normally opened contact of second contactor, the two of the second normally-closed contact of the first contactor End is parallel with the second normally opened contact of third contactor.

The discharge load is discharge resistance.

At the anode and cathode of the input power power switch and a fuse are respectively serially connected on conducting wire.

Compared with prior art, the utility model has the following advantages：

1, the utility model disposes contactless noise transducer using plain type and builds noise measuring auxiliary control pair The brak control unit answered, setting first contactor, second contactor and third contactor in brak control unit, and coordinate by The relay of noise detection unit controller realizes the starting process, reversing braking set-up procedure and reversing braking of motor Journey solves background technology medium velocity Controlling principle and there is operation and inevitable drawback difficult to install, while overcoming mesh The control inaccuracy defect of preceding time control principle.Not only power saving, but also saved equipment cost.

2, in starting process, the first normally-closed contact of first contactor and the second normally-closed contact disconnect, and prevent the second contact Circuit is connected with circuit where the control coil of third contactor where the control coil of device, ensures the high reliability of circuit.

3, it is realized by the relay of noise detection unit controller in reversing braking set-up procedure and starts initial stage electric current also When very big, enabling motor that should not brake can not also brake, and shield to motor, and when with motor rotating speed into One step improves, and when noise reaches the setting valve of setting, the normally-closed contact of relay, which resets, to be closed, to realize the reversal connection system of motor It is dynamic to get ready.

4, during reversing braking, pass through stop button, the connection of third contactor, second contactor and first contactor It is dynamic, and coordinate the relay by noise detection unit controller, realize reversing braking and stop rapidly, second contactor it is normally closed Contact disconnects realization interlocking on the line in the control coil of first contactor, prevents the reignition in braking process from accidentally grasping Make, meanwhile, the normally-closed contact of third contactor disconnects so that armature is connected reversing braking resistance, prevent armature supply excessive and Damage motor.

5, the third normally opened contact of first contactor, the third normally opened contact of second contactor and third contact are also provided with Second normally opened contact of device, during reversing braking, the control line of the third normally opened contact of second contactor in second contactor Circle is closed on the line realizes self-insurance, and the second normally opened contact of third contactor is online in the control coil institute of third contactor Road, which is closed, realizes self-insurance, in starting process, the control coil institute of the third normally opened contact of first contactor in first contactor It is closed on the line and realizes self-insurance, to further increase the reliability of circuit.

Description of the drawings

Fig. 1 is the circuit connection diagram of the noise measuring braking system of direct current generator.

In figure, QS, power switch, FU, fuse, M, motor, LE, Exciting Windings for Transverse Differential Protection, R1, pull-up resistor, R2, current limliting electricity Resistance, R3, braking resistor, R4, discharge resistance, NS, noise transducer, NS-OUT, noise transducer output end, E, cell operation Power supply, VD1, voltage-stabiliser tube, VD2, diode, U1, voltage comparator, VT, NPN triode, KAxq, relay control coil, The normally-closed contact of KAcb, relay, KM1xq, first contactor control coil, KM1ck1, first contactor it is first normally opened Contact, KM1ck2, first contactor the second normally opened contact, KM1ck3, first contactor third normally opened contact, KM1cb1, First normally-closed contact of first contactor, KM1cb2, first contactor the second normally-closed contact, the control of KM2xq, second contactor Coil processed, KM2ck1, second contactor the first normally opened contact, KM2ck2, second contactor the second normally opened contact, The third normally opened contact of KM2ck3, second contactor, KM2cb, second contactor normally-closed contact, KM3xq, third contactor Control coil, KM3ck1, third contactor the first normally opened contact, KM3ck2, third contactor the second normally opened contact, The normally-closed contact of KM3cb, third contactor, SB1ck, starting button opened point, SB1cb, starting button normally closed point, The opened point of SB2ck, stop button, SB2cb, stop button normally closed point.

Specific implementation mode

The utility model is described in detail in the following with reference to the drawings and specific embodiments.The present embodiment is with the utility model Implemented premised on technical solution, gives detailed embodiment and specific operating process, but the guarantor of the utility model Shield range is not limited to following embodiments.

As shown in Figure 1, a kind of noise measuring braking system of direct current generator, including motor M, Exciting Windings for Transverse Differential Protection LE, electric discharge Load, relay, noise detection unit and brak control unit, noise detection unit detect the noise of motor M operations and company The control coil KAxq of contact relay, if noise is more than setting valve, the control signal of output control relay work, control for brake Unit includes that starting button, stop button, first contactor, second contactor, third contactor and braking resistor R3, third connect One end normally-closed contact KM3cb of tentaculum be separately connected the anode of input power, one end of braking resistor R3, Exciting Windings for Transverse Differential Protection LE one End, one end of discharge load, normally closed one end point SB2cb of stop button, one end opened point SB2ck of stop button, second connect Third one end normally opened contact KM2ck3 of tentaculum and one end normally-closed contact KAcb of relay, the normally-closed contact of third contactor The KM3cb other ends are separately connected the other end of braking resistor R3, first one end normally opened contact KM2ck1 of second contactor and The first normally opened contact KM2ck1 other ends of first one end normally opened contact KM1ck1 of one contactor, second contactor are separately connected One end of motor M and second one end normally opened contact KM1ck2 of first contactor, the other end of motor M are separately connected first The first normally opened contact KM1ck1 other ends of contactor and second one end normally opened contact KM2ck2 of second contactor, the first contact The second normally opened contact KM1ck2 other ends of device be separately connected the cathode of input power, ground terminal, second contactor it is second normally opened The control coil of the contact KM2ck2 other ends, the other end of Exciting Windings for Transverse Differential Protection LE, the other end of discharge load, first contactor One end control coil KM3xq of the one end KM1xq, one end control coil KM2xq of second contactor and third contactor, first connects One end normally-closed contact KM2cb of the control coil KM1xq other ends connection second contactor of tentaculum, the normally closed of second contactor are touched The point KM2cb other ends are separately connected one end opened point SB1ck of starting button and the third normally opened contact of first contactor One end of KM1ck3, the opened point SB1ck other ends of starting button be separately connected the normally closed point SB2cb other ends of stop button, The other end of the third normally opened contact KM1ck3 of first contactor and normally closed one end point SB1cb of starting button, starting button The normally closed point SB1cb other ends be separately connected third contactor first one end normally opened contact KM3ck1 and first contactor first The first normally opened contact KM3ck1 other ends of the one end normally-closed contact KM1cb1, third contactor are separately connected the normally opened of stop button The third normally opened contact KM2ck3 other ends of the point SB2ck other ends and second contactor, the first normally-closed contact of first contactor The KM1cb1 other ends connect the control coil KM2xq other ends of second contactor, and the control coil KM3xq of third contactor is another End is separately connected the second normally opened contact KM3ck2 of second one end normally-closed contact KM1cb2 and third contactor of first contactor One end, the second normally-closed contact KM1cb2 other ends of first contactor be separately connected relay the normally-closed contact KAcb other ends and The second normally opened contact KM3ck2 other ends of third contactor.

Noise detection unit includes noise transducer NS, cell operation power supply E, pull-up resistor R1, voltage-stabiliser tube VD1, voltage Comparator U1 and switching tube, noise transducer NS is close on motor M, and to detect real-time noise, cell operation is electric The anode of source E is separately connected one end of pull-up resistor R1 and one end control coil KAxq of relay, and pull-up resistor R1's is another End is separately connected the positive input terminal of the cathode and voltage comparator U1 of voltage-stabiliser tube VD1, the negative input end connection of voltage comparator U1 The control terminal of the output end connecting valve pipe of the output end NS-OUT of noise transducer NS, voltage comparator U1, the of switching tube One end connects the control coil KAxq other ends of relay, and the second end of switching tube is separately connected the anode of voltage-stabiliser tube VD1, unit The cathode and ground terminal of working power E.

In the present embodiment, there are one the diode VD2 of reversal connection for the control coil KAxq both ends parallel connections of relay；Switching tube is Control terminal of the base stage of NPN triode VT, NPN triode VT as switching tube, through current-limiting resistance R2 connection voltage comparators U1 Output end, the first end of the collector of NPN triode VT as switching tube is separately connected the anode and relay of diode VD2 Second end of the emitter of the control coil KAxq of device, NPN triode VT as switching tube.

At the anode and cathode of input power a power switch QS and a fuse FU are respectively serially connected on conducting wire.

The operation principle of the noise measuring braking system of the direct current generator is as follows：

1）Starting process：The original state of the noise measuring braking system of direct current generator is as shown in Figure 1, power turn-on switchs QS connects input power, and fuse FU plays short-circuit protection, and Exciting Windings for Transverse Differential Protection LE, which is obtained, establishes beginning excitation by cable, and discharge load is electric discharge Resistance R4 can achieve the purpose that the too big damage motor M of repid discharge and electric current, press the starting of Unidirectional The control coil KM1xq of button, first contactor obtains electricity, and the linkage of first contactor enables the control coil of second contactor Circuit disconnects where KM2xq（I.e. second contactor does not work）, the first normally opened contact KM1ck1 of first contactor, second normally opened Contact KM1ck2 and the KM1ck3 actions of third normally opened contact are closed, motor M starting operations, while the first of first contactor is often Closed contact KM1cb1 and the second normally-closed contact KM1cb2 are disconnected, circuit where preventing the control coil KM2xq of second contactor and Circuit where the control coil KM3xq of third contactor is connected, the real-time detection noises of noise transducer NS.Wherein, the first contact The third normally opened contact KM1ck3 of device is closed in the control coil KM1xq of first contactor and realizes self-insurance on the line.

2）Reversing braking set-up procedure：When motor M just obtains electrically actuated, the noise decibel of motor M operations is smaller, noise The output end NS-OUT output voltages of sensor NS are smaller, then the negative input end voltage of voltage comparator U1 is less than voltage comparator Voltage at the positive input terminal of U1（Voltage is the cell operation power supply E of direct current through pull-up electricity at the positive input terminal of voltage comparator U1 The voltage at the both ends voltage-stabiliser tube VD1 is added in after resistance R1 partial pressures, size is related with the stationary value of setting）, then voltage comparator U1 Output end exports high level, so that NPN triode VT is connected through current-limiting resistance R2 current limlitings, then the control coil KAxq of relay is obtained Electricity, diode VD2 act protective effect of backflowing so that the normally-closed contact KAcb of relay is disconnected, and starting current is also very big at this time, no Preferably braking can not also brake, and shield to motor.When the rotating speed with motor M further increases, noise decibel reaches When the setting valve of setting, the normally-closed contact KAcb of relay, which resets, to be closed, to realize that standard has been carried out in the reversing braking of motor M It is standby.

3）Reversing braking process：When pressing stop button, first contactor power-off release, the i.e. control line of first contactor Enclose KM1xq power-off, the first normally opened contact KM1ck1, the second normally opened contact KM1ck2 and the third normally opened contact of first contactor KM1ck3, which resets, to be disconnected, and the first normally-closed contact KM1cb1 of first contactor and the second normally-closed contact KM1cb2 are resetted and be closed, the Therefore the control coil KM3xq of three contactors obtains electricity, the first normally opened contact KM3ck1 of third contactor and the second normally opened contact KM3ck2 is closed, and the normally-closed contact KM3cb of third contactor is disconnected, then the control of the second contactor when stop button is pressed Coil KM2xq also obtains electronic work, and the first normally opened contact KM2ck1, the second normally opened contact KM2ck2 and third of second contactor are normal Contact KM2ck3 closures are opened, the first normally opened contact KM2ck1 of second contactor, the closure of the second normally opened contact KM2ck2 make electricity The armature supply of motivation M is reversed, stops rapidly to realize reversing braking.Wherein, the third normally opened contact of second contactor KM2ck3 is closed in the control coil KM2xq of second contactor and realizes self-insurance, the normally-closed contact of second contactor on the line KM2cb disconnects realization interlocking on the line in the control coil KM1xq of first contactor, prevents secondary in braking process Dynamic maloperation, the second normally opened contact KM3ck2 of third contactor third contactor control coil KM3xq institutes on the line It is closed and realizes self-insurance, while the normally-closed contact KM3cb of third contactor is disconnected so that armature series connection reversing braking resistance R3 prevents Only armature supply is excessive and damage motor M.

When braking beginning, the noise decibel of motor M operations is larger, and the normally-closed contact KAcb of relay continues to keep closing It closes；When motor M tapers off operation, when noise decibel drops to setting valve, the normally-closed contact KAcb of relay is opened, and second Contactor and the power-off release of third contactor, are ready for starting next time.

Claims (8)

1. a kind of noise measuring braking system of direct current generator, which is characterized in that including motor, Exciting Windings for Transverse Differential Protection, discharge load, Relay, noise detection unit and brak control unit, the noise detection unit detect the noise of motor running and connection The control coil of relay, if noise is more than setting valve, the control signal of output control relay work, the control for brake list Member includes starting button, stop button, first contactor, second contactor, third contactor and braking resistor, and the third connects It is negative that normally-closed contact one end of tentaculum is separately connected the anode of input power, one end of braking resistor, one end of Exciting Windings for Transverse Differential Protection, electric discharge One end of load, normally closed one end of stop button, opened point one end of stop button and normally-closed contact one end of relay, third The normally-closed contact other end of contactor be separately connected the other end of braking resistor, second contactor first normally opened contact one end and The first normally opened contact other end of first normally opened contact one end of first contactor, the second contactor is separately connected motor One end and first contactor second normally opened contact one end, the other end of the motor is separately connected the of first contactor Second normally opened contact one end of the one normally opened contact other end and second contactor, the second normally opened contact of the first contactor are another One end be separately connected the cathode of input power, ground terminal, the second normally opened contact other end of second contactor, Exciting Windings for Transverse Differential Protection it is another End, control coil one end of the other end of discharge load, first contactor, control coil one end of second contactor and third connect Control coil one end of tentaculum, the normally-closed contact one of the control coil other end connection second contactor of the first contactor End, the second contactor the normally-closed contact other end connection starting button opened point one end, the starting button it is normally opened The point other end is separately connected the normally closed other end of stop button and normally closed one end of starting button, the starting button it is normal The close point other end is separately connected first normally opened contact one end of third contactor and first normally-closed contact one end of first contactor, The opened point other end of the first normally opened contact other end connection stop button of the third contactor, the first contactor The first normally-closed contact other end connects the control coil other end of second contactor, and the control coil of the third contactor is another Second normally-closed contact one end of end connection first contactor, the second normally-closed contact other end of the first contactor connect relay The normally-closed contact other end of device.

2. a kind of noise measuring braking system of direct current generator according to claim 1, which is characterized in that the noise inspection It includes noise transducer, cell operation power supply, pull-up resistor, voltage-stabiliser tube, voltage comparator and switching tube, the noise to survey unit For sensor close on motor, the anode of the cell operation power supply is separately connected one end and the relay of pull-up resistor Control coil one end, the other end of the pull-up resistor is separately connected the cathode of voltage-stabiliser tube and the positive input of voltage comparator End, the output end of the negative input end connection noise transducer of the voltage comparator, the output end connecting valve of voltage comparator The control terminal of pipe, the control coil other end of the first end connection relay of the switching tube, the second end of switching tube connect respectively Connect the anode of voltage-stabiliser tube, the cathode and ground terminal of cell operation power supply.

3. a kind of noise measuring braking system of direct current generator according to claim 2, which is characterized in that the switching tube For NPN triode.

4. a kind of noise measuring braking system of direct current generator according to claim 2, which is characterized in that the voltage ratio Compared with device output end through the control terminal of current-limiting resistance connecting valve pipe.

5. a kind of noise measuring braking system of direct current generator according to claim 2, which is characterized in that the relay The parallel connection of control coil both ends there are one reversal connection diode.

6. a kind of noise measuring braking system of direct current generator according to claim 1, which is characterized in that the starting is pressed The both ends of the opened point of button are parallel with the third normally opened contact of first contactor, and the both ends of the opened point of the stop button are in parallel There are the third normally opened contact of second contactor, the both ends of the second normally-closed contact of the first contactor to be parallel with third contactor The second normally opened contact.

7. a kind of noise measuring braking system of direct current generator according to claim 1, which is characterized in that the electric discharge is negative It is discharge resistance to carry.

8. a kind of noise measuring braking system of direct current generator according to claim 1, which is characterized in that the input electricity At the anode and cathode in source a power switch and a fuse are respectively serially connected on conducting wire.