CN103697126B - A kind of magnetic flow liquid stepless speed variator system and rotating-speed control circuit thereof - Google Patents
A kind of magnetic flow liquid stepless speed variator system and rotating-speed control circuit thereof Download PDFInfo
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- CN103697126B CN103697126B CN201310712684.3A CN201310712684A CN103697126B CN 103697126 B CN103697126 B CN 103697126B CN 201310712684 A CN201310712684 A CN 201310712684A CN 103697126 B CN103697126 B CN 103697126B
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- 239000007788 liquid Substances 0.000 title claims abstract description 102
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- 238000001514 detection method Methods 0.000 claims description 8
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H15/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members
- F16H15/01—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members characterised by the use of a magnetisable powder or liquid as friction medium between the rotary members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/66—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings
- F16H61/664—Friction gearings
Abstract
The invention discloses a kind of magnetic flow liquid stepless speed variator system and rotating-speed control circuit thereof, the rotating-speed control circuit rotating speed comprised for setting required rotating speed arranges module, the first control module, the second control module and DC electrical source.The feedback voltage signal that the actual speed that rotating speed arranges module reception driven shaft is converted into, when actual speed departs from required rotating speed, rotating speed arranges module and inputs different control signals to the second control module, second control module controls disconnection and the on state of the first control module under different control signals, control field coil whether charged thus control its produce magnetic field, and then change the viscosity of magnetic flow liquid, driven shaft is driven to make its actual rotation speed change, the actual speed of driven shaft is controlled near rotating speed needed for setting, realize the stepless change of driven shaft.Compared with the existing rotational speed governor with actuating motor, the structure of the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides is simple, and small volume, cost of production is lower.
Description
Technical field
The present invention relates to transmission technology field, particularly relate to a kind of magnetic flow liquid stepless speed variator system and rotating-speed control circuit thereof.
Background technique
Magnetic flow liquid is as a kind of intellectual material, under the effect of externally-applied magnetic field, change sharply can be there is in its rheological properties, within the short time (millisecond magnitude), its viscosity increases, by the state that the liquid state that rheological properties is good is the poor similar solid of rheological properties, when the effect losing externally-applied magnetic field, be recovered to again the liquid state that rheological properties is good.In recent years, magnetic flow liquid relied on this characteristic to develop to some extent in speed changer field.
At present, magnetic flow liquid stepless speed variator system, as shown in Figure 1, the rotational speed governor (shown in dotted line frame as shown in Figure 1) comprising magnetic flow liquid stepless speed variator 101 and be connected with magnetic flow liquid stepless speed variator 101, this rotational speed governor changes by the voltage strength changing field coil in magnetic flow liquid stepless speed variator 101 electric current [strength flowing through field coil, to change the magnetic intensity of field coil, thus change the viscosity of magnetic flow liquid, finally realize the stepless change of output speed.Wherein, rotational speed governor, as shown in Figure 1, comprises speed probe 102, potentiometer 103, voltage amplifier 104, power amplifier 105, actuating motor 106, gearbox 107 and DC voltage regulator 108.Magnetic flow liquid stepless speed variator 101 is connected with voltage amplifier 104 through speed probe 102, voltage amplifier 104 connects potentiometer 103 and power amplifier 105, power amplifier 105 connects actuating motor 106, and actuating motor 106 is connected with DC voltage regulator 108 through gearbox 107.When real work, the required rotating speed of driven shaft is set with the form of voltage signal Ur by potentiometer 103, there is between this voltage signal Ur and the required rotating speed of setting the function relation determined, the actual speed of driven shaft is detected by speed probe 102 and is converted into voltage signal Uf, deviation signal △ U between Ur and Uf amplifies and drives actuating motor 106 to work by voltage amplifier 104 and power amplifier 105, actuating motor 106 is after gearbox 107 speed change, regulate DC voltage regulator 108 to change the magnitude of voltage U that DC voltage regulator 108 exports to field coil, this magnitude of voltage U change makes the current value change flowing through field coil, thus change the magnetic field of field coil, and then change the viscosity of magnetic flow liquid, finally realize the stepless change of the rotating speed of driven shaft.But the volume of the rotational speed governor of above-mentioned magnetic flow liquid stepless speed variator system is comparatively large, and structure is more complicated, and cost of production can be caused higher.
Therefore, how simplifying the circuit structure of the rotational speed governor of magnetic flow liquid stepless speed variator system, is the technical problem that those skilled in the art need solution badly.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of magnetic flow liquid stepless speed variator system and rotating-speed control circuit thereof, in order to simplify the circuit structure of the rotational speed governor of magnetic flow liquid stepless speed variator system.
Therefore, embodiments provide a kind of rotating-speed control circuit for magnetic flow liquid stepless speed variator system, comprising: the rotating speed for setting required rotating speed arranges module, the first control module, the second control module and DC electrical source; Wherein,
After described first control module is connected with the field coil of described magnetic flow liquid stepless speed variator, module is set with described rotating speed and described second control module is in parallel accesses described DC electrical source, the minus earth of described DC electrical source; The output terminal that described rotating speed arranges module is connected with the input end of described second control module, and the output terminal of described second control module is connected with the input end of described first control module;
Described rotating speed arranges module, also for feedback voltage signal that the actual speed receiving the driven shaft that the magnetic flow liquid that controlled by described field coil drives is converted into, and when described actual speed is less than described required rotating speed, the first control signal is inputted to described second control module, when described actual speed is more than or equal to described required rotating speed, input the second control signal to described second control module;
Described second control module, under the control of described first control signal, controls described first control module conducting, makes the charged generation magnetic field of described field coil; Under the control of described second control signal, control described first control module and disconnect, make described field coil power-off.
The above-mentioned rotating-speed control circuit that the embodiment of the present invention provides, the rotating speed comprised for setting required rotating speed arranges module, the first control module, the second control module and DC electrical source.The feedback voltage signal that the actual speed that rotating speed arranges module reception driven shaft is converted into, when actual speed departs from required rotating speed, rotating speed arranges module and inputs different control signals to the second control module, second control module controls disconnection and the on state of the first control module under different control signals, control field coil whether charged thus control its produce magnetic field, and then change the viscosity of magnetic flow liquid, driven shaft is driven to make its actual rotation speed change, the actual speed of driven shaft is controlled near rotating speed needed for setting, realize the stepless change of driven shaft.Compared with the existing rotational speed governor with actuating motor, the structure of the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides is simple, and small volume, cost of production is lower.
Preferably, for the ease of implementing, in the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides, described first control module specifically comprises: Darlington transistor and first detects resistance; Wherein,
The base stage of described Darlington transistor is the input end of described first control module, the collector electrode of described Darlington transistor is connected with described field coil, and the emitter of described Darlington transistor detects resistance by described first and is connected with the negative pole of described DC electrical source.
Further, the self induction electromotive force produced to prevent field coil punctures Darlington transistor and causes damage, and in the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides, described first control module also comprises: fly-wheel diode; The positive pole of described fly-wheel diode is connected with the collector electrode of described Darlington transistor, and the negative pole of described fly-wheel diode is connected with the positive pole of described DC electrical source.
Preferably, for the ease of implementing, in the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides, described second control module specifically comprises: the first reference diode, the first transistor and the first current-limiting resistance; Wherein,
The negative pole of described first reference diode is the input end of described second control module, and the positive pole of described first reference diode is connected with the base stage of described the first transistor;
The collector electrode of described the first transistor is connected with the positive pole of described DC electrical source by described first current-limiting resistance, and the emitter of described the first transistor is connected with the negative pole of described DC electrical source;
The collector electrode of described the first transistor and the connected node of described first current-limiting resistance are the output terminal of described second control module.
Further, in order to the frequency of the conducting and disconnection that reduce Darlington transistor, to improve the operating life of Darlington transistor, in the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides, the second control module also comprises: reverse feedback electric capacity and negative feedback resistor; Wherein,
Described reverse feedback electric capacity is in parallel with the collector junction of described the first transistor;
Described negative feedback resistor is in parallel with the emitter junction of described the first transistor.
Further, the switching action in order to ensure the first transistor is normal, and can not increase switching because state is not clear and cause damage, in the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides, the second control module also comprises: positive feedback capacitor and positive feedback resistor; Wherein,
Positive feedback capacitor and positive feedback resistor are connected with the base stage of described the first transistor, are connected with the collector electrode of described Darlington transistor after connecting.
Preferably, for the ease of implementing, in the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides, described rotating speed arranges module and specifically comprises: the adjustable resistance of series connection and the first divider resistance; Wherein,
Described adjustable resistance is connected with the positive pole of described DC electrical source, and described first divider resistance is connected with the negative pole of described DC electrical source;
The connected node of described adjustable resistance and described first divider resistance is the output terminal that described rotating speed arranges module.
Further, in order to be filtered out by high-frequency signal, with the impact making the first reference diode in the second control module not be subject to high-frequency signal, in the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides, described rotating speed arranges module and also comprises: filter capacitor; Described filter capacitor is in parallel with described first divider resistance.
Preferably, in order to be short-circuited at field coil or the emitter current of Darlington transistor is excessive time, close Darlington transistor and damage to avoid it, the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides also comprises: over-current protection circuit; Described over-current protection circuit specifically comprises: the 3rd control module, the 4th control module and the 5th control module; Wherein,
Described DC electrical source is accessed after described 3rd control module is in parallel with described 4th control module; The input end of described 3rd control module is connected with the emitter of described Darlington transistor; The output terminal of described 3rd control module is connected with the input end of described 4th control module; The output terminal of described 4th control module is connected with the first input end of described 5th control module; Second input end of described 5th control module is connected with the base stage of described Darlington transistor; The output terminal of described 5th control module is connected with the negative pole of described DC electrical source;
3rd control module, when voltage for the emitter at described Darlington transistor is more than or equal to the threshold voltage of setting, to described 4th control module input the 3rd control signal, when the voltage of the emitter of described Darlington transistor is less than the threshold voltage of setting, to described 4th control module input the 4th control signal;
Described 4th control module, under the control of described 3rd control signal, controls described 5th control module conducting, makes the negative pole conducting of the base stage of described Darlington transistor and described DC electrical source; Under the control of described 4th control signal, control described 5th control module and disconnect, the negative pole of the base stage of described Darlington transistor and described DC electrical source is disconnected.
Preferably, for the ease of implementing, in the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides, described 3rd control module specifically comprises: transistor seconds, third transistor, trigger resistance, the second divider resistance, the second current-limiting resistance, second detect resistance and and electric capacity; Wherein,
The base stage of described transistor seconds is connected with the collector electrode of described third transistor, and is connected with the emitter of described Darlington transistor by described second divider resistance;
The collector electrode of described transistor seconds is connected with the base stage of described third transistor, and is connected by the emitter of described trigger resistance with described third transistor;
The emitter of described third transistor is connected with the positive pole of described DC electrical source by described second current-limiting resistance, and the emitter of described third transistor is connected by the negative pole of described electric capacity with described DC electrical source;
The emitter of described transistor seconds is connected with the negative pole of described DC electrical source;
Described second detection resistance is in parallel with the emitter junction of described transistor seconds;
The connected node of described electric capacity and described second current-limiting resistance is the output terminal of described 3rd control module.
Preferably, for the ease of implementing, in the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides, described 4th control module specifically comprises: the 4th transistor, the 3rd divider resistance, the 3rd detect resistance, the 3rd current-limiting resistance and the second reference diode; Wherein,
The base stage of described 4th transistor is connected by the output terminal of described 3rd divider resistance with described 3rd control module; The collector electrode of described 4th transistor is connected with the positive pole of described second reference diode, and the emitter of described 4th transistor is connected with the negative pole of described DC electrical source;
Described 3rd detection resistance is in parallel with the emitter junction of described 4th transistor;
The negative pole of described second reference diode is connected with the positive pole of described DC electrical source by described 3rd current-limiting resistance;
The connected node of the collector electrode of described 4th transistor and the positive pole of described second reference diode is the output terminal of described 4th control module.
Preferably, for the ease of implementing, in the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides, described 5th control module specifically comprises: the 5th transistor;
The base stage of described 5th transistor is the first input end of described 5th control module, and the collector electrode of described 5th transistor is connected with the base stage of described Darlington transistor, and the emitter of described 5th transistor is connected with the negative pole of described DC electrical source.
The embodiment of the present invention additionally provides a kind of magnetic flow liquid stepless speed variator system, comprising: magnetic flow liquid stepless speed variator, test generator, voltage amplifier and rotating-speed control circuit; Wherein,
Described magnetic flow liquid stepless speed variator comprises: driving disc, the driving shaft be connected with described driving disc, with the staggered driven disc of described driving disc, the driven shaft be connected with described driven disc, the magnetic flow liquid being filled in gap between described driving disc and described driven disc and the field coil controlling described magnetic flow liquid viscosity; The described driving disc be connected with described driving shaft drives the described driven disc be connected with described driven shaft to rotate by described magnetic flow liquid;
Described test generator is connected with described driven shaft, for converting the actual speed of described driven shaft to feedback voltage signal, and described feedback voltage signal is outputted to described voltage amplifier;
Described voltage amplifier, for amplifying the described feedback voltage signal that described test generator exports, and outputs to described rotating-speed control circuit by the described feedback voltage signal after amplifying;
The above-mentioned rotating-speed control circuit that described rotating-speed control circuit provides for the embodiment of the present invention.
Particularly, magnetic flow liquid stepless speed variator also comprises: upper box, lower box, outer magnetism resistent ring and interior magnetism resistent ring; Wherein,
Described interior magnetism resistent ring is connected with described driving shaft by screw, and described outer magnetism resistent ring is connected with described driven shaft by screw;
Described upper box and described lower box are interlocked, and described field coil lays respectively at the top of described upper box and described lower box.
Preferably, have good mobility and transmission effect in order to ensure magnetic flow liquid, in the above-mentioned magnetic flow liquid stepless speed variator system that the embodiment of the present invention provides, the gap between described driving disc and described driven disc is 1-2mm.
Preferably, in order to ensure the stability of magnetic flow liquid, in the above-mentioned magnetic flow liquid stepless speed variator system that the embodiment of the present invention provides, described driving shaft is provided with fan.
Further, in order to ensure good radiating effect, in the above-mentioned magnetic flow liquid stepless speed variator system that the embodiment of the present invention provides, described upper box, described lower box, described driving shaft and described driven shaft are respectively arranged with exhaust port.
Further, in order to ensure preferably heat radiation and every magnetic effect, in the above-mentioned magnetic flow liquid stepless speed variator system that the embodiment of the present invention provides, the material of described interior magnetism resistent ring and described outer magnetism resistent ring is Cuprum alloy.
Accompanying drawing explanation
Fig. 1 is the structural representation of magnetic flow liquid stepless speed variator system in prior art;
The structural representation of the rotating-speed control circuit that Fig. 2 provides for the embodiment of the present invention;
The concrete structure schematic diagram of the rotating-speed control circuit that Fig. 3 provides for the embodiment of the present invention;
The structural representation of the over-current protection circuit that Fig. 4 provides for the embodiment of the present invention;
The concrete structure schematic diagram of the over-current protection circuit that Fig. 5 provides for the embodiment of the present invention;
The structural representation of the magnetic flow liquid stepless speed variator system that Fig. 6 provides for the embodiment of the present invention;
The structural representation of the magnetic flow liquid stepless speed variator that Fig. 7 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the magnetic flow liquid stepless speed variator system provide the embodiment of the present invention and the embodiment of rotating-speed control circuit thereof are described in detail.
A kind of rotating-speed control circuit for magnetic flow liquid stepless speed variator system that the embodiment of the present invention provides, as shown in Figure 2, comprising: the rotating speed for setting required rotating speed arranges module 1, the first control module 2, second control module 3 and DC electrical source 4; Wherein,
After first control module 2 is connected with the field coil 1-8 of magnetic flow liquid stepless speed variator, module 1 is set with rotating speed and the second control module 3 is in parallel accesses DC electrical source 4, the negative pole X1 ground connection of DC electrical source 4; The output terminal X2 that rotating speed arranges module 1 is connected with the input end X3 of the second control module 3, and the output terminal X4 of the second control module 3 is connected with the input end X5 of the first control module 2;
Rotating speed arranges module 1, also for feedback voltage signal Y that the actual speed receiving the driven shaft that the magnetic flow liquid that controlled by field coil 1-8 drives is converted into, and when actual speed is less than required rotating speed, the first control signal is inputted to the second control module 3, when actual speed is more than or equal to required rotating speed, input the second control signal to the second control module 3;
Second control module 3, under the control of the first control signal, controls the first control module 2 conducting, makes the charged generation magnetic field of field coil 1-8; Under the control of the second control signal, control the first control module 2 and disconnect, make field coil 1-8 power-off.
Particularly, in the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides, as shown in Figure 2, the feedback voltage signal Y that the actual speed that the A termination that rotating speed arranges module 1 receives the driven shaft that the magnetic flow liquid that controlled by field coil 1-8 drives is converted into, when actual speed is less than required rotating speed, the output terminal X2 that rotating speed arranges module 1 inputs the first control signal to the input end X3 of the second control module 3, second control module 3 is under the control of the first control signal, control the first control module 2 conducting, make the charged generation magnetic field of field coil 1-8, the viscosity of magnetic flow liquid increases, magnetic flow liquid stepless speed variator utilizes its shearing stress under shear mode to drive driven shaft to rotate, the actual speed of driven shaft increases, when actual speed is more than or equal to required rotating speed, the output terminal X2 that rotating speed arranges module 1 inputs the second control signal to the input end X3 of the second control module 3, second control module 3 is under the control of the second control signal, control the first control module 2 to disconnect, make field coil 1-8 power-off magnetic field dissipate, the viscosity of magnetic flow liquid reduces, and the actual speed of driven shaft reduces, when actual speed is less than required rotating speed, circulation said process, can control the actual speed of driven shaft near rotating speed needed for setting, thus realize the stepless change of driven shaft.Compared with the existing circuit structure with actuating motor, the structure of the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides is simple, and small volume, cost of production is lower.
Preferably, for the ease of implementing, in the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides, as shown in Figure 3, the first control module 2, can specifically comprise: Darlington transistor Q2 and first detects resistance R6; Wherein, the base stage a1 of Darlington transistor Q2 is the input end X5 of the first control module 2, the collector electrode a2 of Darlington transistor Q2 is connected with field coil 1-8, and the emitter a3 of Darlington transistor Q2 detects resistance R6 by first and is connected with the negative pole X1 of DC electrical source 4.When Darlington transistor Q2 conducting, DC electrical source 4, field coil 1-8 and first detect resistance R6 and form loop, make the charged generation magnetic field of field coil 1-8, the viscosity of magnetic flow liquid increases, magnetic flow liquid stepless speed variator utilizes its shearing stress under shear mode to drive driven shaft to rotate, and the actual speed of driven shaft increases; When Darlington transistor Q2 disconnects, make field coil 1-8 power-off magnetic field dissipate, the viscosity of magnetic flow liquid reduces, and the actual speed of driven shaft reduces.
Further, in order to protect Darlington transistor Q2, in the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides, the first control module 2, as shown in Figure 3, can also comprise: sustained diode 1; The positive pole b2 of sustained diode 1 is connected with the collector electrode a2 of Darlington transistor Q2, and the negative pole b1 of sustained diode 1 is connected with the positive pole X6 of DC electrical source 4.The sustained diode 1 in parallel with field coil 1-8, the self induction electromotive force that can prevent field coil 1-8 from producing punctures Darlington transistor Q2 and causes damage, further, when Darlington transistor Q2 disconnects, sustained diode 1 can also provide Releasing loop for the electric current in field coil 1-8.
Preferably, for the ease of implementing, in the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides, the second control module 3, as shown in Figure 3, can specifically comprise: the first reference diode ZD
1, the first transistor Q1 and the first current-limiting resistance R4; Wherein,
First reference diode ZD
1negative pole c1 be the input end X3 of the second control module 3, the first reference diode ZD
1positive pole c2 be connected with the base stage d1 of the first transistor Q1;
The collector electrode d2 of the first transistor Q1 is connected with the positive pole X6 of DC electrical source 4 by the first current-limiting resistance R4, and the emitter d3 of the first transistor Q1 is connected with the negative pole X1 of DC electrical source 4;
The collector electrode d2 of the first transistor Q1 and the connected node of the first current-limiting resistance R4 are the output terminal X4 of the second control module 3.
Particularly, at the first reference diode ZD
1be reversed when puncturing, the first transistor Q1 conducting, the collector electrode d2 of the first transistor Q1 is connected with the negative pole X1 of DC electrical source 4, due to the output terminal X4 that the collector electrode d2 of the first transistor Q1 and the connected node of the first current-limiting resistance R4 are the second control module 3, the output terminal X4 of the second control module 3 is connected with the input end X5 of the first control module 2 and the base stage a1 of Darlington transistor Q2, so, the base stage a1 of the Darlington transistor Q2 be connected with the collector electrode d2 of the first transistor Q1 is connected with the negative pole X1 of DC electrical source 4, and Darlington transistor Q2 is disconnected; At the first reference diode ZD
1be not reversed when puncturing, the first transistor Q1 disconnects, and the voltage of the first current-limiting resistance R4 outputs to the input end X5 of the first control module 2 and base stage a1 of Darlington transistor Q2, makes Darlington transistor Q2 conducting.
Further, in order to the frequency of the conducting and disconnection that reduce Darlington transistor Q2, to improve the operating life of Darlington transistor Q2, in the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides, second control module 3, as shown in Figure 3, can also comprise: reverse feedback electric capacity C3 and negative feedback resistor R3; Wherein, reverse feedback electric capacity C3 is in parallel with the collector junction of the first transistor Q1; Resistance R3 is in parallel with the emitter junction of the first transistor Q1.Particularly, the two ends of the collector junction of the first transistor Q1 are respectively base stage d1 and the collector electrode d2 of the first transistor Q1, and the two ends of the emitter junction of the first transistor Q1 are respectively base stage d1 and the emitter d3 of the first transistor Q1.Reverse feedback electric capacity C3 can control the conducting of Darlington transistor Q2 and the frequency of disconnection, improve the operating life of Darlington transistor Q2, the reverse feedback electric capacity C3 with appropriate electrical capacitance can make Darlington transistor Q2 work at the desired frequency, further, the frequency of Darlington transistor Q2 is made can not to be affected because the actual speed of driven shaft changes.
Further, switching action in order to ensure the first transistor Q1 is normal, switching can not be increased because state is not clear and cause damage, in the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides, second control module 3, as shown in Figure 3, can also comprise: positive feedback capacitor C2 and positive feedback resistor R5; Wherein, positive feedback capacitor C2 and positive feedback resistor R5 is connected with the base stage d1 of the first transistor Q1, is connected with the collector electrode a2 of Darlington transistor Q2 after connecting.It is normal that positive feedback capacitor C2 can guarantee that the first transistor Q1 can switch between conducting and disconnection, avoid increasing switching because state is not clear and cause damage, and, positive feedback capacitor C2 can also produce minimum turn-off time to the first transistor Q1, namely to Darlington transistor Q2 and detect by DC electrical source 4, field coil 1-8 and first loop that resistance R6 forms and produce minimum ON time.
Preferably, for the ease of implementing, in the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides, rotating speed arranges module 1, as shown in Figure 3, can specifically comprise: the adjustable resistance R1 of series connection and the first divider resistance R2; Wherein,
Adjustable resistance R1 is connected with the positive pole X6 of DC electrical source 4, and the first divider resistance R2 is connected with the negative pole X1 of DC electrical source 4;
The connected node of adjustable resistance R1 and the first divider resistance R2 is the output terminal X2 that rotating speed arranges module 1.
Particularly, the feedback voltage signal Y that the actual speed that the A termination that rotating speed arranges module 1 receives driven shaft is converted into, when the actual speed of driven shaft is less than required rotating speed, the voltage on the first divider resistance R2 is less than the first reference diode ZD
1breakdown reverse voltage, the first transistor Q1 is disconnected; When the actual speed of driven shaft is more than or equal to required rotating speed, the voltage on the first divider resistance R2 is more than or equal to the first reference diode ZD
1breakdown reverse voltage, make the first transistor Q1 conducting.
Further, in order to high-frequency signal is filtered out, with the impact making the first reference diode ZD1 in the second control module 3 not be subject to high-frequency signal, in the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides, rotating speed arranges module 1, as shown in Figure 3, can also comprise: filter capacitor C1; Filter capacitor C1 is in parallel with the first divider resistance R2.High-frequency signal can filter out by filter capacitor C1, only allows low frequency signal to pass through, and makes the first reference diode ZD1 not by the impact of high-frequency signal.
In addition, the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides, as shown in Figure 3, can also comprise: work indicator light Lamp in parallel and resistance Rexc, and the interrupteur SW of connecting with work indicator light Lamp and the resistance Rexc of parallel connection.Work indicator light Lamp can be light emitting diode, and positive pole is connected with interrupteur SW, and negative pole is connected with field coil 1-8, can the conducting of indicating circuit and off state, and, when magnetic flow liquid stepless speed variator stable operation, can automatically close; The resistance of resistance Rexc is lower, when interrupteur SW is just closed, the resistance in the loop be made up of DC electrical source 4, field coil 1-8, the first detection resistance R6, work indicator light Lamp and resistance Rexc can be reduced, increase the electric current flowing through field coil 1-8, enable the actual speed of driven shaft reach rapidly the required rotating speed of setting.
Preferably, in order to be short-circuited at field coil 1-8 or the emitter a3 electric current of Darlington transistor Q2 is excessive time, close Darlington transistor Q2 to damage to avoid it, the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides, can also comprise: over-current protection circuit (shown on the right side of dotted line as shown in Figure 4); As shown in Figure 4, over-current protection circuit can specifically comprise: the 3rd control module the 5, four control module 6 and the 5th control module 7; Wherein,
DC electrical source 4 is accessed after 3rd control module 5 is in parallel with the 4th control module 6; The input end X7 of the 3rd control module 5 is connected with the emitter a3 of Darlington transistor Q2; The output terminal X8 of the 3rd control module 5 is connected with the input end X9 of the 4th control module 6; The output terminal X10 of the 4th control module 6 is connected with the first input end X11 of the 5th control module 7; Second input end X12 of the 5th control module 7 is connected with the base stage a1 of Darlington transistor Q2; The output terminal X13 of the 5th control module 7 is connected with the negative pole X1 of DC electrical source 4;
3rd control module 5, when voltage for the emitter a3 at Darlington transistor Q2 is more than or equal to the threshold voltage of setting, the 3rd control signal is inputted to the 4th control module 6, when the voltage of the emitter a3 of Darlington transistor Q2 is less than the threshold voltage of setting, input the 4th control signal to the 4th control module 6;
4th control module 6, under the control of the 3rd control signal, controls the 5th control module 7 conducting, makes the base stage a1 of Darlington transistor Q2 and the negative pole X1 conducting of DC electrical source 4; Under the control of the 4th control signal, control the 5th control module 7 and disconnect, the base stage a1 of Darlington transistor Q2 and the negative pole X1 of DC electrical source 4 is disconnected.
Particularly, when the voltage of the emitter a3 of Darlington transistor Q2 is more than or equal to the threshold voltage of setting, 3rd control module 5 inputs the 3rd control signal to the 4th control module 6,4th control module 6 is under the control of the 3rd control signal, control the 5th control module 7 conducting, make the base stage a1 of Darlington transistor Q2 and the negative pole X1 conducting of DC electrical source 4, Darlington transistor Q2 is disconnected, is not damaged to protect Darlington transistor; When the voltage of the emitter a3 of Darlington transistor Q2 is less than the threshold voltage of setting, 3rd control module 5 inputs the 4th control signal to the 4th control module 6,4th control module 6 is under the control of the 4th control signal, control the 5th control module 7 to disconnect, the base stage a1 of Darlington transistor Q2 and the negative pole X1 of DC electrical source 4 is disconnected.
Preferably, for the ease of implementing, in the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides, 3rd control module 5, as shown in Figure 5, can specifically comprise: transistor seconds Q4, third transistor Q3, trigger resistance R9, the second divider resistance R7, the second current-limiting resistance R10, second detect resistance R8 and with electric capacity C4; Wherein,
The base stage e1 of transistor seconds Q4 is connected with the collector electrode f2 of third transistor Q3, and is connected with the emitter a3 of Darlington transistor Q2 by the second divider resistance R7;
The collector electrode e of transistor seconds Q4 is connected with the base stage f1 of third transistor Q3, and is connected with the emitter f3 of third transistor Q3 by trigger resistance R9;
The emitter f3 of third transistor Q3 is connected with the positive pole X6 of DC electrical source 4 by the second current-limiting resistance R10, and the emitter f3 of third transistor Q3 is connected with the negative pole X1 of DC electrical source 4 by electric capacity C4;
The emitter e 3 of transistor seconds Q4 is connected with the negative pole X1 of DC electrical source 4;
Second detection resistance R8 is in parallel with the emitter junction of transistor seconds Q4;
The connected node of electric capacity C4 and the second current-limiting resistance R10 is the output terminal X8 of the 3rd control module 5.
Particularly, the two ends of the emitter junction of transistor seconds Q4 are respectively base stage e1 and the emitter e 3 of transistor seconds Q4.When the voltage of the emitter a3 of Darlington transistor Q2 is more than or equal to the threshold voltage of setting, the voltage of voltage after the second divider resistance R7 dividing potential drop of the emitter a3 of Darlington transistor Q2 is more than or equal to the critical cut-in voltage of transistor seconds Q4, transistor seconds Q4 conducting, and trigger third transistor Q3 conducting by trigger resistance R9, third transistor Q3 can be PNP type triode, second detection resistance R8, trigger resistance R9 and electric capacity C4 form loop, thus the energy of release electric capacity C4, the voltage at electric capacity C4 two ends is reduced; When the voltage of the emitter a3 of Darlington transistor Q2 is less than the threshold voltage of setting, the voltage of voltage after the second divider resistance R7 dividing potential drop of the emitter a3 of Darlington transistor Q2 is less than the critical cut-in voltage of transistor seconds Q4, transistor seconds Q4 disconnects, third transistor Q3 disconnects, electric capacity C4 is charged by the second current-limiting resistance R10, and the voltage at electric capacity C4 two ends is increased.
Preferably, for the ease of implementing, in the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides, 4th control module 6, as shown in Figure 5, can specifically comprise: the 4th transistor Q5, the 3rd divider resistance R11, the 3rd detect resistance R12, the 3rd current-limiting resistance R13 and the second reference diode ZD2; Wherein,
The base stage g1 of the 4th transistor Q5 is connected with the output terminal X8 of the 3rd control module 5 by the 3rd divider resistance R11; The collector electrode g2 of the 4th transistor Q5 is connected with the positive pole h2 of the second reference diode ZD2, and the emitter g3 of the 4th transistor Q5 is connected with the negative pole X1 of DC electrical source 4;
3rd detection resistance R12 is in parallel with the emitter junction of the 4th transistor Q5;
The negative pole h1 of the second reference diode ZD2 is connected with the positive pole X6 of DC electrical source 4 by the 3rd current-limiting resistance R13;
The connected node of the collector electrode g2 of the 4th transistor Q5 and the positive pole h2 of the second reference diode ZD2 is the output terminal X10 of the 4th control module 6.
Particularly, the two ends of the emitter junction of the 4th transistor Q5 are respectively base stage g1 and the emitter g3 of the 4th transistor Q5.The voltage of voltage at electric capacity C4 two ends after the 3rd divider resistance R11 dividing potential drop is less than the critical cut-in voltage of the 4th transistor Q5, and the 4th transistor Q5 disconnects, and the voltage of the 3rd current-limiting resistance R13 outputs to the first input end X11 of the 5th control module 7, the voltage of voltage at electric capacity C4 two ends after the 3rd divider resistance R11 dividing potential drop is more than or equal to the critical cut-in voltage of the 4th transistor Q5, 4th transistor Q5 conducting, the positive pole h2 of the second reference diode ZD2 is connected with the negative pole X1 of DC electrical source 4, connected node due to the collector electrode g2 of the 4th transistor Q5 and the positive pole h2 of the second reference diode ZD2 is the output terminal X10 of the 4th control module 6, and the output terminal X10 of the 4th control module 6 is connected with the first input end X11 of the 5th control module 7, so the first input end X11 of the 5th control module 7 is connected with the negative pole X1 of DC electrical source 4.
Preferably, for the ease of implementing, in the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides, the 5th control module 7, as shown in Figure 5, can specifically comprise: the 5th transistor Q6;
The base stage k1 of the 5th transistor Q6 is the first input end X11 of the 5th control module 7, and the collector electrode k2 of the 5th transistor Q6 is connected with the base stage a1 of Darlington transistor Q2, and the emitter k3 of the 5th transistor Q6 is connected with the negative pole X1 of DC electrical source 4.When the base stage k1 of i.e. the 5th transistor Q6 of the first input end X11 that the voltage of the 3rd current-limiting resistance R13 outputs to the 5th control module 7,5th transistor Q6 conducting, the base stage a1 of Darlington transistor Q2 is connected with the negative pole X1 of DC electrical source 4, Darlington transistor Q2 disconnects, and protection Darlington transistor Q2 is not damaged; When the base stage k1 of the 5th transistor Q6 is connected with the negative pole X1 of DC electrical source 4, the 5th transistor Q6 disconnects, and the base stage a1 of Darlington transistor Q2 and the negative pole X1 of DC electrical source 4 is disconnected.
And, the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides is when just closing, the actual speed of driven shaft is very little, the voltage difference that rotating speed is arranged between the A end of module 1 and the negative pole X1 of DC electrical source 4 is very little, about only have 2 volts, can cause the 4th transistor Q5 cannot conducting, 5th transistor Q6 conducting, Darlington transistor Q2 disconnects, rotating-speed control circuit can be caused normally to work, now, the second reference diode ZD2 in 4th control module 6 can disconnect by making the 5th transistor Q6, make Darlington transistor Q2 conducting, ensure that rotating-speed control circuit can normally work.
In addition, in the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides, each module is not limited to the above-mentioned parts that the embodiment of the present invention provides, and for can realize other likes of the present invention, can also not limit at this.
The embodiment of the present invention additionally provides a kind of magnetic flow liquid stepless speed variator system, as shown in Figure 6, comprising: magnetic flow liquid stepless speed variator M1 (not shown in Fig. 6), test generator M2, voltage amplifier M3 and rotating-speed control circuit M4; Wherein,
Magnetic flow liquid stepless speed variator M1, as shown in Figure 7, can comprise: driving disc 1-6, the driving shaft 1-1 be connected with driving disc 1-6, with the staggered driven disc 1-11 of driving disc 1-6, the driven shaft 1-14 be connected with driven disc 1-11, the magnetic flow liquid 1-24 being filled in gap between driving disc 1-6 and driven disc 1-11 and the field coil 1-8 controlling magnetic flow liquid viscosity; The driving disc 1-6 be connected with driving shaft 1-1 drives the driven disc 1-11 be connected with driven shaft 1-14 to rotate by magnetic flow liquid;
Test generator M2 is connected with driven shaft 1-14, for converting the actual speed of driven shaft 1-14 to feedback voltage signal, and feedback voltage signal is outputted to voltage amplifier M3;
Voltage amplifier M3, for amplifying the feedback voltage signal that test generator M2 exports, and outputs to rotating-speed control circuit M4 by the feedback voltage signal after amplifying;
The above-mentioned rotating-speed control circuit that rotating-speed control circuit M4 provides for the embodiment of the present invention.The embodiment of this magnetic flow liquid stepless speed variator system medium speed control circuit see the mode of execution of above-mentioned rotating-speed control circuit, can repeat part and repeats no more.
Particularly, in the above-mentioned magnetic flow liquid stepless speed variator system that the embodiment of the present invention provides, field coil 1-8 does not need brush device, electrical spark can not be produced, be specially adapted to occasion electrical spark being had to insulation request, as underground coal mine, the floating factory building etc. having combustible dust.
Particularly, in the above-mentioned magnetic flow liquid stepless speed variator system that the embodiment of the present invention provides, as shown in Figure 6, voltage amplifier M3, can comprise: earth resistance Ri, feedback resistance Rf, ballast resistor Rp and operational amplifier M5, wherein, ballast resistor Rp is connected on the positive signal input part t2 of operational amplifier M5, earth resistance Ri one end ground connection, the other end is connected on the negative signal input part t1 of operational amplifier M5, feedback resistance Rf is connected between the output terminal t3 of operational amplifier M5 and negative signal input part t1, operational amplifier M5 ABAP Adapter Ucc.
The above-mentioned magnetic flow liquid stepless speed variator system that the embodiment of the present invention provides is when specific works, test generator M2 is coaxially connected with the driven shaft 1-14 in magnetic flow liquid stepless speed variator M1, be connected with voltage amplifier M3 by voltage transitions resistance Rc, test generator M2 can detect the actual speed of driven shaft 1-14, and the actual speed of driven shaft 1-14 is converted to feedback voltage signal Y exports to voltage amplifier M3; Feedback voltage signal Y amplifies and outputs to rotating-speed control circuit M4 by voltage amplifier M3; Rotating-speed control circuit M4 is by controlling the electric current of the field coil 1-8 in magnetic flow liquid stepless speed variator M1, change the magnetic field of field coil 1-8, change the viscosity of the magnetic flow liquid 1-24 in magnetic flow liquid stepless speed variator M1, the driven shaft 1-14 in magnetic flow liquid stepless speed variator M1 is driven to rotate, the actual speed of driven shaft 1-14 is controlled near rotating speed needed for setting, thus realize stepless change.
Particularly, the rotating speed in rotating-speed control circuit M4 arranges in module 1, can arrange rotating speed n needed for driven shaft by regulating the resistance of adjustable resistance R1
1, the required rotating speed n of the driven shaft of adjustable resistance R1 and setting
1between there is the function relation determined:
wherein, A
0=1+R
f/ R
ifor the magnification factor of voltage amplifier M3, K is the conversion coefficient of test generator M2,
be the burning voltage of the first reference diode ZD1, V
befor the voltage difference of the first transistor Q1 when conducting between base stage d1 and emitter d3, be generally 0.7V.
Particularly, magnetic flow liquid stepless speed variator M1, as shown in Figure 7, can also comprise: upper box 1-3, lower box 1-22, outer magnetism resistent ring 1-9 and interior magnetism resistent ring 1-5; Wherein,
Interior magnetism resistent ring 1-5 is connected with driving shaft 1-1 by screw, and outer magnetism resistent ring 1-9 is connected with driven shaft 1-14 by screw;
Upper box 1-3 and lower box 1-22 is interlocked, and field coil 1-8 lays respectively at the top of upper box 1-3 and lower box 1-22.
Particularly, when magnetic flow liquid stepless speed variator M1 works, motor drives driving shaft 1-1 to rotate by coupling, driving shaft 1-1 to be connected with interior magnetism resistent ring 1-5 by screw and magnetism resistent ring 1-5 rotates in driving, interior magnetism resistent ring 1-5 drives driving disc 1-6 to rotate, driving disc 1-6 drives driven disc 1-11 and outer magnetism resistent ring 1-9 to rotate by magnetic flow liquid 1-24, outer magnetism resistent ring 1-9 to be connected with driven shaft 1-14 by screw and to drive driven shaft 1-14 to rotate, and driven shaft 1-14 is rotated by the dynamic load of coupling band.
Preferably, in order to ensure magnetic flow liquid 1-24, there is good mobility and transmission effect, in magnetic flow liquid stepless speed variator M1, gap between driving disc 1-6 and driven disc 1-11 can be set to 1-2mm, when gap is too small, the mobility of magnetic flow liquid 1-24 can be deteriorated, and can increase technology difficulty; When excesssive gap, the transmission effect of magnetic flow liquid 1-24 can be deteriorated.
Preferably, in order to ensure the stability of magnetic flow liquid 1-24, improve in magnetic flow liquid stepless speed variator M1, fan 1-20 can be set on driving shaft 1-1, and, can at upper box 1-3, lower box 1-22, driving shaft 1-1 and driven shaft 1-14 is respectively arranged with exhaust port 1-26, like this, the blade rotary of fan 1-20 is driven during driving shaft 1-1 quick rotation, the air flowing in magnetic flow liquid speed changer M1 can be accelerated, inner air is circulated by exhaust port 1-26 and ambient air, the heat of magnetic flow liquid speed changer M1 inside can be distributed, thus ensure the stability of magnetic flow liquid 1-24.
Further, in order to ensure preferably heat radiation and every magnetic effect, improve in magnetic flow liquid stepless speed variator M1, the material of interior magnetism resistent ring 1-5 and outer magnetism resistent ring 1-9 can adopt heat radiation and every the good Cuprum alloy of magnetic effect.
Particularly, improve in magnetic flow liquid stepless speed variator M1, the periphery of field coil 1-8 can be provided with vent hole 1-21, be conducive to field coil 1-8 and dispel the heat.
In addition, magnetic flow liquid stepless speed variator M1, as shown in Figure 7, also can comprise: left end cap 1-2, right end cap 1-15, left magnetic conduction side plate 1-4, the right side are every the parts such as magnetic side plate 1-13, bearing (1-17,1-18,1-27,1-29), circlip (1-16,1-19,1-28,1-30), left O RunddichtringO 1-25, right O RunddichtringO 1-12, left seal washer 1-23, right seal washer 1-10 and coil baffle plate 1-7, these parts are all identical with annexation with the component function in existing magnetic flow liquid stepless speed variator, and therefore not to repeat here.
A kind of magnetic flow liquid stepless speed variator system that the embodiment of the present invention provides and rotating-speed control circuit thereof, the rotating-speed control circuit rotating speed comprised for setting required rotating speed arranges module, the first control module, the second control module and DC electrical source.The feedback voltage signal that the actual speed that rotating speed arranges module reception driven shaft is converted into, when actual speed departs from required rotating speed, rotating speed arranges module and inputs different control signals to the second control module, second control module controls disconnection and the on state of the first control module under different control signals, control field coil whether charged thus control its produce magnetic field, and then change the viscosity of magnetic flow liquid, driven shaft is driven to make its actual rotation speed change, the actual speed of driven shaft is controlled near rotating speed needed for setting, realize the stepless change of driven shaft.Compared with the existing rotational speed governor with actuating motor, the structure of the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides is simple, small volume, and cost of production is lower; Further, the magnetic flow liquid stepless speed variator in the magnetic flow liquid stepless speed variator system that provides of the embodiment of the present invention has better radiating effect and stability.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (16)
1. for a rotating-speed control circuit for magnetic flow liquid stepless speed variator system, it is characterized in that, comprising: the rotating speed for setting required rotating speed arranges module, the first control module, the second control module, over-current protection circuit and DC electrical source; Described over-current protection circuit specifically comprises: the 3rd control module, the 4th control module and the 5th control module; Wherein,
After described first control module is connected with the field coil of described magnetic flow liquid stepless speed variator, module is set with described rotating speed and described second control module is in parallel accesses described DC electrical source, the minus earth of described DC electrical source; The output terminal that described rotating speed arranges module is connected with the input end of described second control module, and the output terminal of described second control module is connected with the input end of described first control module;
Described rotating speed arranges module, also for feedback voltage signal that the actual speed receiving the driven shaft that the magnetic flow liquid that controlled by described field coil drives is converted into, and when described actual speed is less than described required rotating speed, the first control signal is inputted to described second control module, when described actual speed is more than or equal to described required rotating speed, input the second control signal to described second control module;
Described second control module, under the control of described first control signal, controls described first control module conducting, makes the charged generation magnetic field of described field coil; Under the control of described second control signal, control described first control module and disconnect, make described field coil power-off;
Described first control module specifically comprises: Darlington transistor and first detects resistance; Wherein, the base stage of described Darlington transistor is the input end of described first control module, the collector electrode of described Darlington transistor is connected with described field coil, and the emitter of described Darlington transistor detects resistance by described first and is connected with the negative pole of described DC electrical source;
Described DC electrical source is accessed after described 3rd control module is in parallel with described 4th control module; The input end of described 3rd control module is connected with the emitter of described Darlington transistor; The output terminal of described 3rd control module is connected with the input end of described 4th control module; The output terminal of described 4th control module is connected with the first input end of described 5th control module; Second input end of described 5th control module is connected with the base stage of described Darlington transistor; The output terminal of described 5th control module is connected with the negative pole of described DC electrical source;
3rd control module, when voltage for the emitter at described Darlington transistor is more than or equal to the threshold voltage of setting, to described 4th control module input the 3rd control signal, when the voltage of the emitter of described Darlington transistor is less than the threshold voltage of setting, to described 4th control module input the 4th control signal;
Described 4th control module, under the control of described 3rd control signal, controls described 5th control module conducting, makes the negative pole conducting of the base stage of described Darlington transistor and described DC electrical source; Under the control of described 4th control signal, control described 5th control module and disconnect, the negative pole of the base stage of described Darlington transistor and described DC electrical source is disconnected.
2. rotating-speed control circuit as claimed in claim 1, it is characterized in that, described first control module also comprises: fly-wheel diode; The positive pole of described fly-wheel diode is connected with the collector electrode of described Darlington transistor, and the negative pole of described fly-wheel diode is connected with the positive pole of described DC electrical source.
3. rotating-speed control circuit as claimed in claim 1, it is characterized in that, described second control module specifically comprises: the first reference diode, the first transistor and the first current-limiting resistance; Wherein,
The negative pole of described first reference diode is the input end of described second control module, and the positive pole of described first reference diode is connected with the base stage of described the first transistor;
The collector electrode of described the first transistor is connected with the positive pole of described DC electrical source by described first current-limiting resistance, and the emitter of described the first transistor is connected with the negative pole of described DC electrical source;
The collector electrode of described the first transistor and the connected node of described first current-limiting resistance are the output terminal of described second control module.
4. rotating-speed control circuit as claimed in claim 3, it is characterized in that, the second control module also comprises: reverse feedback electric capacity and negative feedback resistor; Wherein,
Described reverse feedback electric capacity is in parallel with the collector junction of described the first transistor;
Described negative feedback resistor is in parallel with the emitter junction of described the first transistor.
5. rotating-speed control circuit as claimed in claim 3, it is characterized in that, the second control module also comprises: positive feedback capacitor and positive feedback resistor; Wherein,
Positive feedback capacitor and positive feedback resistor are connected with the base stage of described the first transistor, are connected with the collector electrode of described Darlington transistor after connecting.
6. rotating-speed control circuit as claimed in claim 1, it is characterized in that, described rotating speed arranges module and specifically comprises: the adjustable resistance of series connection and the first divider resistance; Wherein,
Described adjustable resistance is connected with the positive pole of described DC electrical source, and described first divider resistance is connected with the negative pole of described DC electrical source;
The connected node of described adjustable resistance and described first divider resistance is the output terminal that described rotating speed arranges module.
7. rotating-speed control circuit as claimed in claim 6, it is characterized in that, described rotating speed arranges module and also comprises: filter capacitor; Described filter capacitor is in parallel with described first divider resistance.
8. rotating-speed control circuit as claimed in claim 1, it is characterized in that, described 3rd control module specifically comprises: transistor seconds, third transistor, trigger resistance, the second divider resistance, the second current-limiting resistance, second detect resistance and electric capacity; Wherein,
The base stage of described transistor seconds is connected with the collector electrode of described third transistor, and is connected with the emitter of described Darlington transistor by described second divider resistance;
The collector electrode of described transistor seconds is connected with the base stage of described third transistor, and is connected by the emitter of described trigger resistance with described third transistor;
The emitter of described third transistor is connected with the positive pole of described DC electrical source by described second current-limiting resistance, and the emitter of described third transistor is connected by the negative pole of described electric capacity with described DC electrical source;
The emitter of described transistor seconds is connected with the negative pole of described DC electrical source;
Described second detection resistance is in parallel with the emitter junction of described transistor seconds;
The connected node of described electric capacity and described second current-limiting resistance is the output terminal of described 3rd control module.
9. rotating-speed control circuit as claimed in claim 1, it is characterized in that, described 4th control module specifically comprises: the 4th transistor, the 3rd divider resistance, the 3rd detect resistance, the 3rd current-limiting resistance and the second reference diode; Wherein,
The base stage of described 4th transistor is connected by the output terminal of described 3rd divider resistance with described 3rd control module; The collector electrode of described 4th transistor is connected with the positive pole of described second reference diode, and the emitter of described 4th transistor is connected with the negative pole of described DC electrical source;
Described 3rd detection resistance is in parallel with the emitter junction of described 4th transistor;
The negative pole of described second reference diode is connected with the positive pole of described DC electrical source by described 3rd current-limiting resistance;
The connected node of the collector electrode of described 4th transistor and the positive pole of described second reference diode is the output terminal of described 4th control module.
10. rotating-speed control circuit as claimed in claim 1, it is characterized in that, described 5th control module specifically comprises: the 5th transistor;
The base stage of described 5th transistor is the first input end of described 5th control module, and the collector electrode of described 5th transistor is connected with the base stage of described Darlington transistor, and the emitter of described 5th transistor is connected with the negative pole of described DC electrical source.
11. 1 kinds of magnetic flow liquid stepless speed variator systems, is characterized in that, comprising: magnetic flow liquid stepless speed variator, test generator, voltage amplifier and rotating-speed control circuit; Wherein,
Described magnetic flow liquid stepless speed variator comprises: driving disc, the driving shaft be connected with described driving disc, with the staggered driven disc of described driving disc, the driven shaft be connected with described driven disc, the magnetic flow liquid being filled in gap between described driving disc and described driven disc and the field coil controlling described magnetic flow liquid viscosity; The described driving disc be connected with described driving shaft drives the described driven disc be connected with described driven shaft to rotate by described magnetic flow liquid;
Described test generator is connected with described driven shaft, for converting the actual speed of described driven shaft to feedback voltage signal, and described feedback voltage signal is outputted to described voltage amplifier;
Described voltage amplifier, for amplifying the described feedback voltage signal that described test generator exports, and outputs to described rotating-speed control circuit by the described feedback voltage signal after amplifying;
Described rotating-speed control circuit is the rotating-speed control circuit as described in any one of claim 1-10.
12. magnetic flow liquid stepless speed variator systems as claimed in claim 11, it is characterized in that, magnetic flow liquid stepless speed variator also comprises: upper box, lower box, outer magnetism resistent ring and interior magnetism resistent ring; Wherein,
Described interior magnetism resistent ring is connected with described driving shaft by screw, and described outer magnetism resistent ring is connected with described driven shaft by screw;
Described upper box and described lower box are interlocked, and described field coil lays respectively at the top of described upper box and described lower box.
13. magnetic flow liquid stepless speed variator systems as described in claim 11 or 12, it is characterized in that, the gap between described driving disc and described driven disc is 1-2mm.
14. magnetic flow liquid stepless speed variator systems as described in claim 11 or 12, is characterized in that, described driving shaft is provided with fan.
15. magnetic flow liquid stepless speed variator systems as claimed in claim 12, is characterized in that, described upper box, described lower box, described driving shaft and described driven shaft are respectively arranged with exhaust port.
16. magnetic flow liquid stepless speed variator systems as claimed in claim 12, is characterized in that, the material of described interior magnetism resistent ring and described outer magnetism resistent ring is Cuprum alloy.
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| DE10108533A1 (en) * | 2001-02-22 | 2002-09-12 | Schenck Ag Carl | Torque converter has hydraulic positive-displacement pump and motor, two rotors, rotary piston, fluid-filled chambers in housing and condenser plates or coils |
| CN1523251A (en) * | 2003-09-08 | 2004-08-25 | 重庆大学 | Magnetorheological continuously variable transmission |
| CN201412460Y (en) * | 2009-06-15 | 2010-02-24 | 杭州电子科技大学 | Drive device based on magnetorheological fluid |
| CN102734410A (en) * | 2012-06-28 | 2012-10-17 | 中国矿业大学 | Magnetorheological fluid continuously variable transmission |
| CN102878225A (en) * | 2012-10-14 | 2013-01-16 | 吉林大学 | Multiple-piece magneto-rheological fluid torque transferring device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103697126A (en) | 2014-04-02 |
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