CN2109021U - Speed requlating controller with dc motor synchronism - Google Patents

Abstract

The utility model provides a speed regulating controller with dc motor synchronism, which is suitable for a dc dragged device with a plurality of motors in industries of printing and dyeing, textile, etc., mainly comprising a three-phase half control bridge, an excitation source, a trigger control, a main ream control, a synchronous control, a voltage negative feedback, a current positive feedback, a magnetic-loss protection, an over current protection, a slow start circuit, etc. A high voltage floating ground mode is adopted between a high-voltage high-power control part and a low-pressure control part; the controlled silicon trigger control adopts an NS type triggering module with stable performance, reliable triggering; the main ream and the synchronous signal adopt a high voltage alternating current transmission mode and an electromagnetic isolation mode; the magnetic-loss protection is arranged; all electronic devices adopt the measure of oil immersion corrosion protection.

Description

Speed requlating controller with DC motor synchronism

The utility model provides a kind of direct current machine synchronous variable-speed control device that is applicable to many motor DCs of dyeing textile industry driven equipment.

The direct current of present domestic dyeing apparatus drags, and mostly is common-battery source variable field control mode, and adopts variable field control, and mechanical property is soft, speed adjustable range narrow (speed ratio is 1:3), low rate start difficulty.Conventional equipment high-low pressure control circuit is isolated fully, the circuit structure complexity, and functional reliability is poor, and electronic control circuit does not have anti-corrosion measure, at printing and dyeing industry high temperature, high humidity with have and be difficult to the long-term safety operation in the adverse circumstances of soda acid gas.

The purpose of this utility model is that a kind of new DC motor synchronous speed setting controller will be provided, and improving its speed adjusting performance, adapts to dyeing and printing process high-speed and high-efficiency, safe and reliable requirement.

The utility model is to realize like this; this controller adopts the separated motor control mode, and it mainly makes control, Synchronization Control, voltage negative feedback, positive current feedback, field loss protection, overcurrent protection, slow start power supply and zero cross detection circuit form by three-phase half controlled bridge, field power supply, triggering control, master.The voltage of three-phase half controlled bridge circuit output is as the armature power supply of direct current machine, and its amplitude size is controlled by trigger control circuit, and the controllable silicon in this circuit changes the infinitely variable speeds that the angle of flow can be realized motor.Field power supply partly is a bridge rectifier, for direct current machine provides exciting current.Main order control and synchronization control circuit adopt the ac high-voltage signal transmission form, and high-voltage signal offers trigger control circuit behind the step-down isolation rectification, mainly make that signal is a speed of a motor vehicle control signal, and synchronizing signal is the poor synchronous control signal of speed between motor.Zero passage detection is finished by three unidirectional miniature transformers respectively, is consistent with triggering control voltage-phase to guarantee the thyristor operating angle in the three-phase half controlled bridge circuit.Its C phase transformer double as power transformer, secondary voltage after rectifying and wave-filtering, voltage stabilizing as the working power of trigger control circuit.Adopted NS3 type trigger module in the low-voltage control circuit.Adopted floating ground of high pressure mode between high-power control circuit and the low-voltage control circuit.All electronic device is immersed in the airtight container that transformer oil (or other high-insulativity liquid) are housed.

The utility model has been owing to adopted the floating ground of high pressure mode, so omitted various quarantine measures between high-voltage control circuit and the low-voltage control circuit, and as the voltage isolation transformer etc., structure is more simple, compact.Adopted NS3 type trigger module in the trigger control circuit, stable performance, reliable trigger.Main order control and synchronization control circuit have adopted the ac high-voltage transmission means, make control signal both anti-interference in long Distance Transmission process, need not shielding again.Set up the field loss protection circuit, can protect motor, under the loss of excitation situation, do not burnt out.Owing to adopted the immersion oil anti-corrosion measure, can guarantee entire controller under industry severe environmental conditions such as printing and dyeing, long-term safety is moved reliably.

Describe the utility model particular circuit configurations and operation principle in detail below in conjunction with drawings and Examples.

Accompanying drawing is the utility model circuit theory diagrams.

As shown in the figure, in excitation power circuit, field power supply is introduced by BIN, behind D22～D25 bridge rectifier as the field power supply of direct current machine.R21, C18 form the high-voltage pulse absorption circuit.

Resistance R 22, diode D26 are connected in the excitation power circuit in the bridge rectifier between the negative pole and magnet exciting coil of diode; form the field loss protection circuit; when loss of excitation; J1 discharges; the J1-2 closure; control signal bypass, armature voltage are output as zero, can avoid the loss of excitation of direct current machine to damage fault.

Three-phase half controlled bridge circuit of the present utility model mainly is made up of three-phase controllable silicon CT1, CT2, CT3, rectifier diode D26, D27, D28.The controllable silicon positive pole is connected on respectively on three live wires of power line, and negative pole connects direct current machine as the armature power supply by resistance R 23, and the size of electric moter voltage is by the decision of silicon controlled ON time, and the control angle of flow can be realized the infinitely variable speeds of motor.Rectifier diode D26, D27, D28 negative pole connect the controllable silicon positive pole respectively, and its positive pole connects the direct current machine armature.Capacitor C 11～C17 and resistance R 8～R14 form absorption circuit respectively, to prevent the over-voltage breakdown of high power device.Sustained diode 28 is connected between controllable silicon negative pole and the rectifier diode positive pole.

Three-phase of the present utility model triggers control section and mainly is made up of trigger module NS32, NS33, NS34, wherein NS32 is the synthetic trigger module of signal, 3.7 the master that defeated end is gone into makes signal, 8, the synchronizing signal of 9 ends input, the current feedback signal of the voltage negative feedback signal of 5 ends input and the input of 10 ends by the output of 12 ends, is controlled trigger module NS33, NS34 after NS32 is synthetic by a certain percentage, NS32 produces a trigger impulse simultaneously, through diode D11 control CT1 conducting.The angle of phase displacement and the resultant voltage of trigger impulse are proportional.13, the zero passage detection signal of 17 ends is as the phase shift reference point.R5 is a rate adaptation resistance.B, C trigger mutually respectively and are finished by NS3, NS34.6,10 ends are the zero cross signal test side, and 4 ends are the composite signal input, and 1 end is the trigger impulse output.Trigger impulse by NS31, NS34 output passes through the angle of flow that diode D12, D13 control CT2, CT3 respectively, and R6, R7 also are rate adaptation resistance.

Positive current feedback, voltage negative feedback, overcurrent protection, slow start are handled by the NS31 module synthesis.The current signal one tunnel that is detected by R23 is used for overcurrent protection function through 1 end of W1 to NS31, and adjusting W1 can change the current protection scope.Another road as positive current feedback, is regulated the mechanical property that W2 can improve motor through 16 ends of W2 to NS31.The positive current feedback signal that detects after amplifying is exported 10 ends of input module NS32 through 3 ends.The voltage negative feedback signal is regulated W3 by 5 ends of the H2 of armature end through R15, R16 and potentiometer W3 connection module NS32, can change its upper limit output voltage.The slow start operating voltage is imported by 10 ends, and the slow start signal is exported by 7 ends.The purpose of slow start be in the protection electrifying startup process raising speed steadily, prevent overbump.Diode D3～D13 shields, and C3～C6 is a filter capacitor.

Zero passage detection is finished by three unidirectional miniature transformer B1, B2, B3, the power transformer of C phase transformer B1 double as low voltage control part, its detected zero cross signal is sent into 17,13 ends of trigger module NS32, and the detected zero cross signal of B2, B3 is sent into 10,6 ends of trigger module NS33, NS34 respectively.Zero cross signal can guarantee that thyristor operating angle is consistent with triggering control voltage-phase in the three-phase half controlled bridge circuit.

The C phase voltage for low voltage control partly provides power supply, is connected to current-limiting resistance R4 between diode D2 negative pole and 7815 after diode D1, D2 rectification, resistance R 3, capacitor C 1, C2 filtering, 7815 regulator block voltage stabilizings after transformer B1 step-down.Slow start voltage is from being incorporated into 10 ends of NS31 between R4 and 7815.Adopt floating ground of high pressure mode between high-power control section and the low voltage control part; promptly directly introduce 16 ends of module NS31 as the positive current feedback signal through W2 by the detected current signal one tunnel of R23; one the tunnel directly introduces 1 end of module NS31 through W1; as the overcurrent protection signal, thereby saved the electric current isolating transformer.Hold 5 ends that detected voltage signal directly introduces module NS32 through R15, R16, W3 as the voltage negative feedback signal from armature H2, omitted the voltage isolation transformer.The SCR control utmost point directly links to each other with trigger impulse output GA, GB, GC, has omitted pulse transformer, thereby has simplified line construction, has improved reliability.

Main signal and the synchronizing signal of making adopts 0～250V ac high-voltage input mode, respectively after transformer B4, B5 step-down are isolated, through D14～17, D18～D21 the bridge circuit rectification, C7, C8, R17, the R8 that form, after C9, C10, R19, the R20 filtering, synchronizing signal is sent into 8,9 ends of module NS32, and the master makes signal send into 3,7 ends.

Since will lead make, synchronous, positive current feedback, voltage negative feedback, overcurrent protection and slow start signal synthesis be superimposed; after synthesizing by a certain percentage, trigger module triggers control by synthetic triggering of signal; can realize dynamic, steady, continuous maneuverable purpose; compare with single closed loop, the double circle controling mode of routine; avoided contingent vibration; reliable operation is adjusted easy.

Claims (4)

1, direct current machine synchronous variable-speed controller, mainly by three-phase half controlled bridge, field power supply, trigger control, main order control, Synchronization Control, the voltage negative feedback, positive current feedback, field loss protection, overcurrent protection, slow start and zero cross detection circuit are formed, it is characterized in that, adopted floating ground of high pressure mode between the high-power control circuit of institute's art and the low-voltage control circuit, be the controllable silicon CT1 of high voltage control part, CT2, CT3 control utmost point GA, GB, the triggering control impuls output GA of GC and low voltage control part, GB, GC directly links to each other, the voltage negative feedback signal is held through resistance R 15 by armature H2, R16, potentiometer W3 directly introduces 5 ends of module NS32, by resistance R 23 detected overcurrent protection signal and positive current feedback signals, respectively through potentiometer W1, W2 directly introduces 1 of module NS3,16 ends; In described trigger control circuit, adopted NS3 type trigger module, make the synchronizing signal of signal, 8, the input of 9 ends, the voltage negative feedback signal of 5 ends input, the positive current feedback signal of 10 ends input from the master of 3,7 ends input, through module NS32 superpose in proportion synthetic after, meet two trigger module NS33, NS34 in addition by the output of 12 ends, meet controllable silicon CT1 control end GA from the triggering signal of module NS32 output through D11, from module NS33, NS34 output triggering signal respectively through D12, D13, meet control end GB, the GC of controllable silicon CT2, CT3.

2, direct current machine synchronous variable-speed controller as claimed in claim 1, it is characterized in that, main order control, synchronous control signal adopt 0～250V ac high-voltage transmission means, isolate through transformer B4, B5 step-down respectively, the bridge circuit rectification that diode D14～D17, D18～D21 forms, after capacitor C 7～C8, C9～C10 filtering, the master makes signal send into 7,8 ends of module NS32, and synchronizing signal is sent into 3,9 ends.

3, as direct current machine isochronous controller as described in the claim 1,2; it is characterized in that; described field loss protection circuit is made up of exciting current sample resistance R22, direct current relay J1 and relay normally-closed contact J1-2; resistance R 22, relay J 1 are connected between the B1 end of the negative pole of bridge rectifier in the excitation power circuit and magnet exciting coil, and normally-closed contact J1-2 is connected between 3 ends of the negative pole of diode D8～D10 and trigger module.

4, as claim 1,2 described direct current machine synchronous variable-speed controllers, it is characterized in that all components and parts of described controller are immersed in the closed container that transformer oil (or other high-insulativity liquid) are housed.

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