CN103697126A - Magnetorheological fluid continuously variable transmission system and rotating speed control circuit thereof - Google Patents
Magnetorheological fluid continuously variable transmission system and rotating speed control circuit thereof Download PDFInfo
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- CN103697126A CN103697126A CN201310712684.3A CN201310712684A CN103697126A CN 103697126 A CN103697126 A CN 103697126A CN 201310712684 A CN201310712684 A CN 201310712684A CN 103697126 A CN103697126 A CN 103697126A
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- 230000005540 biological transmission Effects 0.000 title abstract description 6
- 239000012530 fluid Substances 0.000 title abstract 3
- 230000005291 magnetic effect Effects 0.000 claims abstract description 112
- 239000007788 liquid Substances 0.000 claims description 94
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- 230000005389 magnetism Effects 0.000 claims description 23
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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
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Abstract
The invention discloses a magnetorheological fluid continuously variable transmission system and a rotating speed control circuit thereof. The rotating speed control circuit comprises a rotating speed setting module, a first control module, a second control module and a direct-current power supply, wherein the rotating speed setting module is used for setting needed rotating speed and receiving feedback voltage signals converted from the practical rotating speed of a driven shaft. When the practical rotating speed deviates from the needed rotating speed, the rotating speed setting module inputs different control signals to the second control module, the second control module controls disconnecting and connecting states of the first control module under the different control signals, controls an excitation coil to be electrified or not and accordingly controls a magnetic field generated by the excitation coil, so that the viscosity of magnetorheological fluids is changed, the driven shaft is driven to change the practical rotating speed, the practical rotating speed of the driven shaft is controlled near the set needed rotating speed, and continuously variable transmission of the driven shaft is realized. Compared with an existing rotating speed controller with a servo motor, the rotating speed control circuit is simple in structure, small in size and low in production cost.
Description
Technical field
The present invention relates to speed changer technical field, relate in particular 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, can there is variation sharply in its rheological properties, within the short time (millisecond magnitude), its viscosity increases, by the good liquid state of rheological properties, changed into the state of the poor similar solid of rheological properties, in the used time of doing that loses externally-applied magnetic field, be recovered to again the good liquid state of rheological properties.In recent years, magnetic flow liquid relied on this specific character to develop to some extent in speed changer field.
At present, magnetic flow liquid stepless speed variator system, as shown in Figure 1, comprise magnetic flow liquid stepless speed variator 101 and the rotational speed governor being connected with magnetic flow liquid stepless speed variator 101 (shown in dotted line frame as shown in Figure 1), this rotational speed governor changes the electric current [strength of the field coil of flowing through by changing the voltage strength of field coil in magnetic flow liquid stepless speed variator 101, to change the magnetic intensity of field coil, thereby change the viscosity of magnetic flow liquid, finally realize the stepless variation 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, between the required rotating speed of this voltage signal Ur and setting, there is definite function relation, the actual speed of driven shaft detects and is converted into voltage signal Uf by speed probe 102, voltage amplifier 104 and power amplifier 105 amplify the deviation signal △ U between Ur and Uf and drive actuating motor 106 to work, actuating motor 106 is after gearbox 107 speed changes, regulate DC voltage regulator 108 to change DC voltage regulator 108, to export to the magnitude of voltage U of field coil, the current value that this magnitude of voltage U changes the field coil that makes to flow through changes, thereby change the magnetic field of field coil, and then the viscosity of change magnetic flow liquid, finally realize the stepless variation 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 larger, structure is more complicated, can cause cost of production 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, the embodiment of the present invention provides a kind of rotating-speed control circuit for magnetic flow liquid stepless speed variator system, comprising: for setting the rotating speed of required rotating speed, module is set, the first control module, the second control module and DC electrical source; Wherein,
After described the first control module is connected with the field coil of described magnetic flow liquid stepless speed variator, with described rotating speed, module and the described DC electrical source of described the second control module access in parallel, the minus earth of described DC electrical source are set; The output terminal that described rotating speed arranges module is connected with the input end of described the second control module, and the output terminal of described the second control module is connected with the input end of described the first control module;
Described rotating speed arranges module, the feedback voltage signal being also converted into for receiving the actual speed of the driven shaft that the magnetic flow liquid controlled by described field coil drives, and when described actual speed is less than described required rotating speed, to described the second control module, input the first control signal, when described actual speed is more than or equal to described required rotating speed, to described the second control module, input the second control signal;
Described the second control module, under the control in described the first control signal, controls described the first control module conducting, makes the charged generation of described field coil magnetic field; Under the control of described the second control signal, control described the 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, comprises for setting the rotating speed of required rotating speed module, the first control module, the second control module and DC electrical source is set.Rotating speed arranges the feedback voltage signal that actual speed that module receives 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, the second control module is controlled disconnection and the on state of the first control module under different control signals, thereby control the whether charged magnetic field of controlling its generation of field coil, and then the viscosity of change magnetic flow liquid, drive driven shaft to make its actual rotation speed change, the actual speed of driven shaft is controlled near the required rotating speed of setting, realize the stepless change of driven shaft.Compare with the existing rotational speed governor with actuating motor, the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides simple in structure, small volume, cost of production is lower.
Preferably, for the ease of implementing, in the above-mentioned rotating-speed control circuit providing in the embodiment of the present invention, described the 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 the 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, in order to prevent that the self induction electromotive force of field coil generation from puncturing Darlington transistor and causing damage, in the above-mentioned rotating-speed control circuit providing in the embodiment of the present invention, described the 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 providing in the embodiment of the present invention, described the second control module specifically comprises: the first reference diode, the first transistor and the first current-limiting resistance; Wherein,
The negative pole of described the first reference diode is the input end of described the second control module, and the positive pole of described the 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 the first current-limiting resistance, and the emitter of described the first transistor is connected with the negative pole of described DC electrical source;
The connected node of the collector electrode of described the first transistor and described the first current-limiting resistance is the output terminal of described the second control module.
Further, in order to reduce the frequency of conducting and the disconnection of Darlington transistor, to improve the operating life of Darlington transistor, in the above-mentioned rotating-speed control circuit providing in the embodiment of the present invention, 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, normal in order to ensure the switching action of the first transistor, can not increase to switch because state is not clear and cause damage, in the above-mentioned rotating-speed control circuit providing in the embodiment of the present invention, the second control module also comprises: positive feedback electric capacity and positive feedback resistor; Wherein,
After positive feedback electric capacity and positive feedback resistor series connection, be connected with the base stage of described the first transistor, be connected with the collector electrode of described Darlington transistor.
Preferably, for the ease of implementing, in the above-mentioned rotating-speed control circuit providing in the embodiment of the present invention, 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 the first divider resistance is connected with the negative pole of described DC electrical source;
The connected node of described adjustable resistance and described the first divider resistance is the output terminal that described rotating speed arranges module.
Further, for high-frequency signal is filtered out, so that the first reference diode in the second control module is not subject to the impact of high-frequency signal, in the above-mentioned rotating-speed control circuit providing in the embodiment of the present invention, described rotating speed arranges module and also comprises: filter capacitor; Described filter capacitor is in parallel with described the first divider resistance.
Preferably, in order to be short-circuited at field coil or when the emitter current of Darlington transistor is excessive, to close Darlington transistor to avoid it to damage, 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,
After described the 3rd control module is in parallel with described the 4th control module, access described DC electrical source; Described the 3rd input end of control module and the emitter of described Darlington transistor are connected; The output terminal of described the 3rd control module is connected with the input end of described the 4th control module; The output terminal of described the 4th control module is connected with the first input end of described the 5th control module; The second input end of described the 5th control module is connected with the base stage of described Darlington transistor; Described the 5th output terminal of control module and the negative pole of described DC electrical source are connected;
The 3rd control module, while being more than or equal to the threshold voltage of setting for the voltage at the emitter of described Darlington transistor, to described the 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 the 4th control module input the 4th control signal;
Described the 4th control module, under the control in described the 3rd control signal, controls described the 5th control module conducting, makes the negative pole conducting of base stage and the described DC electrical source of described Darlington transistor; Under the control of described the 4th control signal, control described the 5th control module and disconnect, the base stage of described Darlington transistor and the negative pole of described DC electrical source are disconnected.
Preferably, for the ease of implementing, in the above-mentioned rotating-speed control circuit providing in the embodiment of the present invention, described the 3rd control module specifically comprises: transistor seconds, the 3rd 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 described the 3rd transistorized collector electrode, and is connected with the emitter of described Darlington transistor by described the second divider resistance;
The collector electrode of described transistor seconds is connected with described the 3rd transistorized base stage, and is connected with described the 3rd transistorized emitter by described triggering resistance;
Described the 3rd transistorized emitter is connected with the positive pole of described DC electrical source by described the second current-limiting resistance, and described the 3rd transistorized emitter is connected with the negative pole of described DC electrical source by described electric capacity;
The emitter of described transistor seconds is connected with the negative pole of described DC electrical source;
Described the second detection resistance is in parallel with the emitter junction of described transistor seconds;
The connected node of described electric capacity and described the second current-limiting resistance is the output terminal of described the 3rd control module.
Preferably, for the ease of implementing, in the above-mentioned rotating-speed control circuit providing in the embodiment of the present invention, described the 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,
Described the 4th transistorized base stage is connected with the output terminal of described the 3rd control module by described the 3rd divider resistance; Described the 4th transistorized collector electrode is connected with the positive pole of described the second reference diode, and described the 4th transistorized emitter is connected with the negative pole of described DC electrical source;
Described the 3rd detection resistance is in parallel with described the 4th transistorized emitter junction;
The negative pole of described the second reference diode is connected with the positive pole of described DC electrical source by described the 3rd current-limiting resistance;
The anodal connected node of described the 4th transistorized collector electrode and described the second reference diode is the output terminal of described the 4th control module.
Preferably, for the ease of implementing, in the above-mentioned rotating-speed control circuit providing in the embodiment of the present invention, described the 5th control module specifically comprises: the 5th transistor;
Described the 5th transistorized base stage is the first input end of described the 5th control module, and described the 5th transistorized collector electrode is connected with the base stage of described Darlington transistor, and described the 5th transistorized emitter is connected with the negative pole of described DC electrical source.
The embodiment of the present invention also 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 being connected with described driving disc, with the staggered driven disc of described driving disc, the driven shaft being connected with described driven disc, be filled in the magnetic flow liquid of gap between described driving disc and described driven disc and the field coil of controlling described magnetic flow liquid viscosity; The described driving disc being connected with described driving shaft drives the described driven disc being 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 outputed to described voltage amplifier;
Described voltage amplifier, for amplifying the described feedback voltage signal of described test generator output, 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, in order to ensure magnetic flow liquid, have good mobility and transmission effect, in the above-mentioned magnetic flow liquid stepless speed variator system providing in the embodiment of the present invention, the gap between described driving disc and described driven disc is 1-2mm.
Preferably, in order to guarantee the stability of magnetic flow liquid, in the above-mentioned magnetic flow liquid stepless speed variator system providing in the embodiment of the present invention, on described driving shaft, be provided with fan.
Further, in order to guarantee good radiating effect, in the above-mentioned magnetic flow liquid stepless speed variator system providing in the embodiment of the present invention, on described upper box, described lower box, described driving shaft and described driven shaft, be respectively arranged with exhaust port.
Further, in order to guarantee preferably heat radiation and every magnetic effect, in the above-mentioned magnetic flow liquid stepless speed variator system providing in the embodiment of the present invention, 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 that the embodiment of the present invention is provided 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: for setting the rotating speed of required rotating speed, module 1, the first control module 2, the second control modules 3 and DC electrical source 4 is set; Wherein,
After the first control module 2 is connected with the field coil 1-8 of magnetic flow liquid stepless speed variator, with rotating speed, module 1 and the second control module 3 access in parallel DC electrical source 4, the negative pole X1 ground connection of DC electrical source 4 are set; 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, the feedback voltage signal Y being also converted into for receiving the actual speed of the driven shaft that the magnetic flow liquid controlled by field coil 1-8 drives, and when actual speed is less than required rotating speed, to second control module 3 input the first control signals, when actual speed is more than or equal to required rotating speed, to second control module 3 input the second control signals;
The second control module 3, under the control in the first control signal, controls the first control module 2 conductings, makes the charged generation of field coil 1-8 magnetic field; 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 providing in the embodiment of the present invention, as shown in Figure 2, the A termination that rotating speed arranges module 1 is received the feedback voltage signal Y that the actual speed of the driven shaft that the magnetic flow liquid 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, the second control module 3 is under the control of the first control signal, control the first control module 2 conductings, make the charged generation of field coil 1-8 magnetic field, 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, the second control module 3 is under the control of the second control signal, controlling the first control module 2 disconnects, make the field coil 1-8 magnetic field diminishes of breaking, 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 be controlled at the actual speed of driven shaft near the required rotating speed of setting, thereby realizes the stepless change of driven shaft.Compare with the existing circuit structure with actuating motor, the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides simple in structure, small volume, cost of production is lower.
Preferably, for the ease of implementing, in the above-mentioned rotating-speed control circuit providing in the embodiment of the present invention, as shown in Figure 3, the first control module 2, can specifically comprise: Darlington transistor Q2 and first detects resistance R 6; 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 R 6 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 R 6 and form loop, make the charged generation of field coil 1-8 magnetic field, 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 the field coil 1-8 magnetic field diminishes of breaking, 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 providing in the embodiment of the present invention, the first control module 2, as shown in Figure 3, can also comprise: sustained diode 1; The anodal 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 anodal X6 of DC electrical source 4.The sustained diode 1 in parallel with field coil 1-8, can prevent that self induction electromotive force that field coil 1-8 produces from puncturing Darlington transistor Q2 and causing damage, and 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 providing in the embodiment of the present invention, 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,
The first reference diode ZD
1negative pole c1 be the input end X3 of the second control module 3, the first reference diode ZD
1anodal 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 anodal 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 while 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, because 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, the output terminal X4 of the second control module 3 is connected with the base stage a1 that the input end X5 of the first control module 2 is Darlington transistor Q2, so, the base stage a1 of Darlington transistor Q2 and the negative pole X1 of DC electrical source 4 that are connected with the collector electrode d2 of the first transistor Q1 are connected, and Darlington transistor Q2 is disconnected; At the first reference diode ZD
1be not reversed while puncturing, the first transistor Q1 disconnects, and the Voltage-output of the first current-limiting resistance R4 is the base stage a1 of Darlington transistor Q2 to the input end X5 of the first control module 2, makes Darlington transistor Q2 conducting.
Further, in order to reduce the frequency of conducting and the disconnection of Darlington transistor Q2, to improve the operating life of Darlington transistor Q2, in the above-mentioned rotating-speed control circuit providing in the embodiment of the present invention, the second control module 3, as shown in Figure 3, can also comprise: reverse feedback capacitor C 3 and negative feedback resistor R3; Wherein, reverse feedback capacitor C 3 is in parallel with the collector junction of the first transistor Q1; Resistance R 3 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 capacitor C 3 can be controlled the frequency of conducting and the disconnection of Darlington transistor Q2, improve the operating life of Darlington transistor Q2, the reverse feedback capacitor C 3 with appropriate electrical capacitance can make Darlington transistor Q2 work under required frequency, and, make the frequency of Darlington transistor Q2 can because of the actual speed of driven shaft, not change and be affected.
Further, switching action in order to ensure the first transistor Q1 is normal, can not increase to switch because state is not clear and cause damage, in the above-mentioned rotating-speed control circuit providing in the embodiment of the present invention, the second control module 3, as shown in Figure 3, can also comprise: positive feedback capacitor C 2 and positive feedback resistor R5; Wherein, after positive feedback capacitor C 2 and positive feedback resistor R5 series connection, be connected with the base stage d1 of the first transistor Q1, be connected with the collector electrode a2 of Darlington transistor Q2.Positive feedback capacitor C 2 can guarantee that the first transistor Q1 switches normally between can and disconnecting in conducting, avoid increasing to switch because state is not clear causing damage, and, positive feedback capacitor C 2 can also produce minimum turn-off time to the first transistor Q1, to Darlington transistor Q2 and detect by DC electrical source 4, field coil 1-8 and first loop that resistance R 6 forms and produce minimum ON time.
Preferably, for the ease of implementing, in the above-mentioned rotating-speed control circuit providing in the embodiment of the present invention, 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 anodal 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 A termination that rotating speed arranges module 1 is received the feedback voltage signal Y that the actual speed of driven shaft is converted into, and 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, for high-frequency signal is filtered out, so that the first reference diode ZD1 in the second control module 3 is not subject to the impact of high-frequency signal, in the above-mentioned rotating-speed control circuit providing in the embodiment of the present invention, 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.Filter capacitor C1 can filter out high-frequency signal, only allows low frequency signal to pass through, and makes the first reference diode ZD1 not be subject to 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: in parallel work indicator light Lamp and resistance R exc, and the interrupteur SW of connecting with work indicator light Lamp in parallel and resistance R exc.Work indicator light Lamp can be light emitting diode, anodal is connected with interrupteur SW, and negative pole is connected with field coil 1-8, conducting and off state that can indicating circuit, and, when magnetic flow liquid stepless speed variator stable operation, can automatically close; The resistance of resistance R exc is lower, when interrupteur SW is just closed, can reduce the resistance in the loop being formed by DC electrical source 4, field coil 1-8, the first detection resistance R 6, work indicator light Lamp and resistance R exc, increase the electric current of the field coil 1-8 that flows through, make the actual speed of driven shaft can reach rapidly the required rotating speed of setting.
Preferably, in order to be short-circuited at field coil 1-8 or when the emitter a3 electric current of Darlington transistor Q2 is excessive, close Darlington transistor Q2 to avoid its damage, the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides, can also comprise: over-current protection circuit (shown in dotted line right side as shown in Figure 4); As shown in Figure 4, over-current protection circuit can specifically comprise: the 3rd control module 5, the four control modules 6 and the 5th control module 7; Wherein,
Access DC electrical source 4 after the 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; The 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;
The 3rd control module 5, while being more than or equal to the threshold voltage of setting for the voltage at the emitter a3 of Darlington transistor Q2, to the 4th control module 6 input the 3rd control signals, when the voltage of the emitter a3 of Darlington transistor Q2 is less than the threshold voltage of setting, to the 4th control module 6 input the 4th control signals;
The 4th control module 6, under the control in the 3rd control signal, controls the 5th control module 7 conductings, 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 are disconnected.
Particularly, when the voltage of the emitter a3 of Darlington transistor Q2 is more than or equal to the threshold voltage of setting, the 3rd control module 5 is to the 4th control module 6 input the 3rd control signals, the 4th control module 6 is under the control of the 3rd control signal, control the 5th control module 7 conductings, 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, to protect Darlington transistor not to be damaged; When the voltage of the emitter a3 of Darlington transistor Q2 is less than the threshold voltage of setting, the 3rd control module 5 is to the 4th control module 6 input the 4th control signals, the 4th control module 6 is 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 are disconnected.
Preferably, for the ease of implementing, in the above-mentioned rotating-speed control circuit providing in the embodiment of the present invention, the 3rd control module 5, as shown in Figure 5, can specifically comprise: transistor seconds Q4, the 3rd transistor Q3, trigger resistance R 9, the second divider resistance R7, the second current-limiting resistance R10, second detect resistance R 8 and with capacitor C 4; Wherein,
The base stage e1 of transistor seconds Q4 is connected with the collector electrode f2 of the 3rd 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 the 3rd transistor Q3, and is connected with the emitter f3 of the 3rd transistor Q3 by triggering resistance R 9;
The emitter f3 of the 3rd transistor Q3 is connected with the anodal X6 of DC electrical source 4 by the second current-limiting resistance R10, and the emitter f3 of the 3rd transistor Q3 is connected with the negative pole X1 of DC electrical source 4 by capacitor C 4;
The emitter e 3 of transistor seconds Q4 is connected with the negative pole X1 of DC electrical source 4;
The second detection resistance R 8 is in parallel with the emitter junction of transistor seconds Q4;
The connected node of capacitor C 4 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 the voltage of the emitter a3 of Darlington transistor Q2 after the second divider resistance R7 dividing potential drop is more than or equal to the critical cut-in voltage of transistor seconds Q4, transistor seconds Q4 conducting, and trigger the 3rd transistor Q3 conducting by triggering resistance R 9, the 3rd transistor Q3 can be positive-negative-positive triode, second detects resistance R 8, triggering resistance R 9 and capacitor C 4 formation loops, thereby the energy that discharges capacitor C 4, reduces the voltage at capacitor C 4 two ends; When the voltage of the emitter a3 of Darlington transistor Q2 is less than the threshold voltage of setting, the voltage of the voltage of the emitter a3 of Darlington transistor Q2 after the second divider resistance R7 dividing potential drop is less than the critical cut-in voltage of transistor seconds Q4, transistor seconds Q4 disconnects, the 3rd transistor Q3 disconnects, capacitor C 4 is charged by the second current-limiting resistance R10, and the voltage at capacitor C 4 two ends is increased.
Preferably, for the ease of implementing, in the above-mentioned rotating-speed control circuit providing in the embodiment of the present invention, the 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 R 12, 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 anodal 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;
The 3rd detection resistance R 12 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 anodal 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 anodal 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.When the voltage at the voltage at capacitor C 4 two ends after the 3rd divider resistance R11 dividing potential drop is less than the critical cut-in voltage of the 4th transistor Q5, the 4th transistor Q5 disconnects, the first input end X11 of Voltage-output to the five control modules 7 of the 3rd current-limiting resistance R13, when the voltage at the voltage at capacitor C 4 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, the 4th transistor Q5 conducting, the anodal h2 of the second reference diode ZD2 and the negative pole X1 of DC electrical source 4 are connected, because the connected node of the collector electrode g2 of the 4th transistor Q5 and the anodal 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 providing in the embodiment of the present invention, 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.At the first input end X11 of Voltage-output to the five control modules 7 of the 3rd current-limiting resistance R13 during the base stage k1 of the 5th transistor Q6, the 5th transistor Q6 conducting, the base stage a1 of Darlington transistor Q2 and the negative pole X1 of DC electrical source 4 are connected, Darlington transistor Q2 disconnects, and protection Darlington transistor Q2 is not damaged; When the base stage k1 of the 5th transistor Q6 and the negative pole X1 of DC electrical source 4 are connected, the 5th transistor Q6 disconnects, and makes the base stage a1 of Darlington transistor Q2 and the negative pole X1 of DC electrical source 4 disconnection.
And, the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides is when firm closure, the actual speed of driven shaft is very little, A end and the voltage difference between the negative pole X1 of DC electrical source 4 that rotating speed arranges module 1 are very little, approximately only have 2 volts, can cause the 4th transistor Q5 cannot conducting, the 5th transistor Q6 conducting, Darlington transistor Q2 disconnects, can cause rotating-speed control circuit normally to work, now, the second reference diode ZD2 in the 4th control module 6 can be by disconnecting the 5th transistor Q6, make Darlington transistor Q2 conducting, assurance rotating-speed control circuit can normally be worked.
In addition, in the above-mentioned rotating-speed control circuit providing in the embodiment of the present invention, each module is not limited to the above-mentioned parts that the embodiment of the present invention provides, and can also, for realizing other likes of the present invention, at this, not limit.
The embodiment of the present invention also 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 being connected with driving disc 1-6, with the staggered driven disc 1-11 of driving disc 1-6, the driven shaft 1-14 being connected with driven disc 1-11, the field coil 1-8 that is filled in the magnetic flow liquid 1-24 of gap between driving disc 1-6 and driven disc 1-11 and controls magnetic flow liquid viscosity; The driving disc 1-6 being connected with driving shaft 1-1 drives the driven disc 1-11 being 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 outputed to voltage amplifier M3;
Voltage amplifier M3, for amplifying the feedback voltage signal of test generator M2 output, 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 can, referring to the mode of execution of above-mentioned rotating-speed control circuit, repeat part and repeat no more.
Particularly, in the above-mentioned magnetic flow liquid stepless speed variator system providing in the embodiment of the present invention, field coil 1-8 does not need brush equipment, can not produce electrical spark, be specially adapted to electrical spark to have the occasion of insulation request, under coal mine, the floating factory building that has combustible dust etc.
Particularly, in the above-mentioned magnetic flow liquid stepless speed variator system providing in the embodiment of the present invention, 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 and negative signal input part t1 of operational amplifier M5, 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, by voltage transitions resistance R c, be connected with voltage amplifier M3, 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; Voltage amplifier M3 amplifies feedback voltage signal Y and outputs to rotating-speed control circuit M4; 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, drive the driven shaft 1-14 in magnetic flow liquid stepless speed variator M1 to rotate, the actual speed of driven shaft 1-14 is controlled at setting required rotating speed near, thereby realize stepless change.
Particularly, the rotating speed in rotating-speed control circuit M4 arranges in module 1, by regulating the resistance of adjustable resistance R1 that the required rotation speed n of driven shaft can be set
1, the required rotation speed n of the driven shaft of adjustable resistance R1 and setting
1between there is definite function relation:
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 first transistor Q1 voltage difference between base stage d1 and emitter d3 when the conducting, 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 are 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 is connected with interior magnetism resistent ring 1-5 by screw and drives interior magnetism resistent ring 1-5 to rotate, 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 is connected with driven shaft 1-14 by screw and drives driven shaft 1-14 to rotate, and driven shaft 1-14 rotates 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, can driving disc 1-6 and driven disc 1-11 between gap be set to 1-2mm, when too small in gap, the mobility meeting variation of magnetic flow liquid 1-24, and can increase technology difficulty; When excesssive gap, the transmission effect of magnetic flow liquid 1-24 can variation.
Preferably, in order to guarantee the stability of magnetic flow liquid 1-24, in magnetic flow liquid stepless speed variator M1, improve, fan 1-20 can be set on driving shaft 1-1, and, can be at upper box 1-3, lower box 1-22, on driving shaft 1-1 and driven shaft 1-14, be respectively arranged with exhaust port 1-26, like this, during driving shaft 1-1 quick rotation, drive the blade rotary of fan 1-20, can accelerate the Air Flow in magnetic flow liquid speed changer M1, inner air circulates by exhaust port 1-26 and ambient air, the dissipation of heat of magnetic flow liquid speed changer M1 inside can be gone out, thereby guarantee the stability of magnetic flow liquid 1-24.
Further, in order to guarantee preferably heat radiation and every magnetic effect, to 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, in magnetic flow liquid stepless speed variator M1, improve, can be provided with in the periphery of field coil 1-8 vent hole 1-21, be conducive to field coil 1-8 heat radiation.
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, right every 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 and rotating-speed control circuit thereof that the embodiment of the present invention provides, rotating-speed control circuit comprises for setting the rotating speed of required rotating speed module, the first control module, the second control module and DC electrical source is set.Rotating speed arranges the feedback voltage signal that actual speed that module receives 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, the second control module is controlled disconnection and the on state of the first control module under different control signals, thereby control the whether charged magnetic field of controlling its generation of field coil, and then the viscosity of change magnetic flow liquid, drive driven shaft to make its actual rotation speed change, the actual speed of driven shaft is controlled near the required rotating speed of setting, realize the stepless change of driven shaft.Compare with the existing rotational speed governor with actuating motor, the above-mentioned rotating-speed control circuit that the embodiment of the present invention provides simple in structure, small volume, cost of production is lower; And the magnetic flow liquid stepless speed variator in the magnetic flow liquid stepless speed variator system that the embodiment of the present invention provides has better radiating effect and stability.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (18)
1. for a rotating-speed control circuit for magnetic flow liquid stepless speed variator system, it is characterized in that, comprising: for setting the rotating speed of required rotating speed, module is set, the first control module, the second control module and DC electrical source; Wherein,
After described the first control module is connected with the field coil of described magnetic flow liquid stepless speed variator, with described rotating speed, module and the described DC electrical source of described the second control module access in parallel, the minus earth of described DC electrical source are set; The output terminal that described rotating speed arranges module is connected with the input end of described the second control module, and the output terminal of described the second control module is connected with the input end of described the first control module;
Described rotating speed arranges module, the feedback voltage signal being also converted into for receiving the actual speed of the driven shaft that the magnetic flow liquid controlled by described field coil drives, and when described actual speed is less than described required rotating speed, to described the second control module, input the first control signal, when described actual speed is more than or equal to described required rotating speed, to described the second control module, input the second control signal;
Described the second control module, under the control in described the first control signal, controls described the first control module conducting, makes the charged generation of described field coil magnetic field; Under the control of described the second control signal, control described the first control module and disconnect, make described field coil power-off.
2. rotating-speed control circuit as claimed in claim 1, is characterized in that, described the 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 the 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.
3. rotating-speed control circuit as claimed in claim 2, is characterized in that, described the 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.
4. rotating-speed control circuit as claimed in claim 2, is characterized in that, described the second control module specifically comprises: the first reference diode, the first transistor and the first current-limiting resistance; Wherein,
The negative pole of described the first reference diode is the input end of described the second control module, and the positive pole of described the 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 the first current-limiting resistance, and the emitter of described the first transistor is connected with the negative pole of described DC electrical source;
The connected node of the collector electrode of described the first transistor and described the first current-limiting resistance is the output terminal of described the second control module.
5. rotating-speed control circuit as claimed in claim 4, 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.
6. rotating-speed control circuit as claimed in claim 4, is characterized in that, the second control module also comprises: positive feedback electric capacity and positive feedback resistor; Wherein,
After positive feedback electric capacity and positive feedback resistor series connection, be connected with the base stage of described the first transistor, be connected with the collector electrode of described Darlington transistor.
7. rotating-speed control circuit as claimed in claim 2, 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 the first divider resistance is connected with the negative pole of described DC electrical source;
The connected node of described adjustable resistance and described the first divider resistance is the output terminal that described rotating speed arranges module.
8. rotating-speed control circuit as claimed in claim 7, is characterized in that, described rotating speed arranges module and also comprises: filter capacitor; Described filter capacitor is in parallel with described the first divider resistance.
9. the rotating-speed control circuit as described in claim 2-8 any one, is characterized in that, 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,
After described the 3rd control module is in parallel with described the 4th control module, access described DC electrical source; Described the 3rd input end of control module and the emitter of described Darlington transistor are connected; The output terminal of described the 3rd control module is connected with the input end of described the 4th control module; The output terminal of described the 4th control module is connected with the first input end of described the 5th control module; The second input end of described the 5th control module is connected with the base stage of described Darlington transistor; Described the 5th output terminal of control module and the negative pole of described DC electrical source are connected;
The 3rd control module, while being more than or equal to the threshold voltage of setting for the voltage at the emitter of described Darlington transistor, to described the 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 the 4th control module input the 4th control signal;
Described the 4th control module, under the control in described the 3rd control signal, controls described the 5th control module conducting, makes the negative pole conducting of base stage and the described DC electrical source of described Darlington transistor; Under the control of described the 4th control signal, control described the 5th control module and disconnect, the base stage of described Darlington transistor and the negative pole of described DC electrical source are disconnected.
10. rotating-speed control circuit as claimed in claim 9, is characterized in that, described the 3rd control module specifically comprises: transistor seconds, the 3rd 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 described the 3rd transistorized collector electrode, and is connected with the emitter of described Darlington transistor by described the second divider resistance;
The collector electrode of described transistor seconds is connected with described the 3rd transistorized base stage, and is connected with described the 3rd transistorized emitter by described triggering resistance;
Described the 3rd transistorized emitter is connected with the positive pole of described DC electrical source by described the second current-limiting resistance, and described the 3rd transistorized emitter is connected with the negative pole of described DC electrical source by described electric capacity;
The emitter of described transistor seconds is connected with the negative pole of described DC electrical source;
Described the second detection resistance is in parallel with the emitter junction of described transistor seconds;
The connected node of described electric capacity and described the second current-limiting resistance is the output terminal of described the 3rd control module.
11. rotating-speed control circuits as claimed in claim 9, is characterized in that, described the 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,
Described the 4th transistorized base stage is connected with the output terminal of described the 3rd control module by described the 3rd divider resistance; Described the 4th transistorized collector electrode is connected with the positive pole of described the second reference diode, and described the 4th transistorized emitter is connected with the negative pole of described DC electrical source;
Described the 3rd detection resistance is in parallel with described the 4th transistorized emitter junction;
The negative pole of described the second reference diode is connected with the positive pole of described DC electrical source by described the 3rd current-limiting resistance;
The anodal connected node of described the 4th transistorized collector electrode and described the second reference diode is the output terminal of described the 4th control module.
12. rotating-speed control circuits as claimed in claim 9, is characterized in that, described the 5th control module specifically comprises: the 5th transistor;
Described the 5th transistorized base stage is the first input end of described the 5th control module, and described the 5th transistorized collector electrode is connected with the base stage of described Darlington transistor, and described the 5th transistorized emitter is connected with the negative pole of described DC electrical source.
13. 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 being connected with described driving disc, with the staggered driven disc of described driving disc, the driven shaft being connected with described driven disc, be filled in the magnetic flow liquid of gap between described driving disc and described driven disc and the field coil of controlling described magnetic flow liquid viscosity; The described driving disc being connected with described driving shaft drives the described driven disc being 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 outputed to described voltage amplifier;
Described voltage amplifier, for amplifying the described feedback voltage signal of described test generator output, 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 claim 1-12 any one.
14. systems as claimed in claim 13, 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.
15. systems as described in claim 13 or 14, is characterized in that, the gap between described driving disc and described driven disc is 1-2mm.
16. systems as described in claim 13 or 14, is characterized in that, on described driving shaft, are provided with fan.
17. systems as claimed in claim 14, is characterized in that, on described upper box, described lower box, described driving shaft and described driven shaft, are respectively arranged with exhaust port.
18. systems as claimed in claim 14, 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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| CN102878225A (en) * | 2012-10-14 | 2013-01-16 | 吉林大学 | Multiple-piece magneto-rheological fluid torque transferring device |
-
2013
- 2013-12-20 CN CN201310712684.3A patent/CN103697126B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3156217B2 (en) * | 1993-06-24 | 2001-04-16 | 三菱電機株式会社 | Magnetic particle type torque transmission device |
| 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 |
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| CN103697126B (en) | 2016-01-06 |
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