CN204964083U - Digital strain type torque sensor based on band stop filter circuit - Google Patents
Digital strain type torque sensor based on band stop filter circuit Download PDFInfo
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- CN204964083U CN204964083U CN201520657266.3U CN201520657266U CN204964083U CN 204964083 U CN204964083 U CN 204964083U CN 201520657266 U CN201520657266 U CN 201520657266U CN 204964083 U CN204964083 U CN 204964083U
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Abstract
The utility model discloses a digital strain type torque sensor based on band stop filter circuit, its characterized in that: including fluted disc U, photoelectric switch S, stator system, electrical resolver T1, electrical resolver T2 to and rotor system, rotor system is then include rectifier K, the resistance bridge that meets an emergency, signal conversion means, band stop filtering unit, signal amplifier P2, band stop filtering unit is by constitutions such as triode VT1, triode VT2, amplifier P4, amplifier P5. The utility model discloses a signal conversion means, it can alternate into frequency pulse signal to voltage signal, its pulse signal's who alternaties difference in frequency when at different work condition to make it still can keep fine suitability under different work condition. The utility model discloses an effect of band stop filtering unit can be filtered interfering signal, avoids interfering signal to cause the influence to pulse signal.
Description
Technical field
The utility model relates to sensor technical field, specifically refers to a kind of digitizing strain-type torque sensor based on rejector circuit.
Background technology
In existing strain-type torque sensor technology, the electric signal usually adopting analog circuitry processes foil gauge to export, is converted into proportional linear analogue amount output signal, as voltage, electric current or frequency pulse signal.But there is following defect in simulating signal, one in use: be unfavorable for strong electromagnetic environment and transmit at a distance, and can electrostatic interference be brought into when human contact, be difficult to operation.Its two: to calibration, demarcate and parameter adjustment time all need to adjust the parameter of circuit.Its three: simulating signal to need to use after secondary instrument process could with the equipment connection such as computing machine.How overcoming above defect is that people are badly in need of solving.
Utility model content
The purpose of this utility model is the above defect overcoming the existence of existing strain-type torque sensor, provides a kind of digitizing strain-type torque sensor based on rejector circuit.
The purpose of this utility model is achieved through the following technical solutions: a kind of digitizing strain-type torque sensor based on rejector circuit, comprises fluted disc U, optoelectronic switch S, stator system, rotary transformer T1, rotary transformer T2, and rotor-support-foundation system; One end of described optoelectronic switch S is connected with fluted disc U, the other end is then connected with stator system, the former limit of rotary transformer T1 is connected with stator system, its secondary is then connected with rotor-support-foundation system, and the former limit of rotary transformer T2 is connected with rotor-support-foundation system, its secondary is then connected with stator system.
Further, described rotor-support-foundation system is by rectifier K, the strain resistor electric bridge be connected with rectifier K, the signal conversion unit be connected with strain resistor electric bridge, the bandreject filtering unit be connected with signal conversion unit, and form with the signal amplifier P2 that rectifier K is connected with bandreject filtering unit simultaneously; Described rectifier K is also connected with the secondary of rotary transformer T1, and signal amplifier P2 is also connected with the former limit of rotary transformer T2.
Described bandreject filtering unit is by triode VT1, triode VT2, amplifier P4, amplifier P5, one end is connected with the collector of triode VT1, the other end is then in turn through resistance R3 that potentiometer R4 is connected with the base stage of triode VT2 after resistance R5, the electric capacity C4 be in parallel with potentiometer R4, positive pole is connected with the control end of potentiometer R4, the electric capacity C2 that negative pole is then connected with the base stage of triode VT1, one end is connected with the base stage of triode VT1, the resistance R6 that the other end is then connected with the base stage of triode VT2, one end is connected with the emitter of triode VT1, the resistance R7 of ground connection while the other end is then connected with the negative pole of amplifier P5, negative pole is connected with the output terminal of amplifier P4 after resistance R8, the electric capacity C3 that positive pole is then connected with the positive pole of amplifier P5, and the resistance R9 be serially connected between the positive pole of amplifier P5 and output terminal forms, the collector of described triode VT1 forms the input end of this bandreject filtering unit, and its base stage and emitter are then all connected with the positive pole of amplifier P4, the output terminal of described amplifier P4 is connected with the base stage of triode VT2, and its negative pole is then connected with the negative pole of amplifier P5, the grounded collector of described triode VT2, its emitter is then connected with the positive pole of amplifier P5, the output terminal of described amplifier P5 then forms the output terminal of this bandreject filtering unit.
Described signal conversion unit is by amplifier P3, Sheffer stroke gate A1, Sheffer stroke gate A2, the diode D1 that N pole is connected with the positive pole of amplifier P3, P pole then forms the input end of this signal conversion unit, the electric capacity C1 that positive pole is connected with the P pole of diode D1, negative pole is then connected with the negative pole of amplifier P3 after potentiometer R2, the resistance R1 be in parallel with electric capacity C1, and the diode D2 that N pole is connected with the negative pole of amplifier P3, P pole is then connected with the positive pole of Sheffer stroke gate A1 after polarity-inverting amplifier A3 forms; The negative pole of described electric capacity C1 is connected with the control end of potentiometer R2; The negative pole of described Sheffer stroke gate A2 is connected with the output terminal of amplifier P3, and its positive pole is then connected with the output terminal of Sheffer stroke gate A1, and its output terminal forms the output terminal of this signal conversion unit while being then connected with the negative pole of Sheffer stroke gate A1.
Described stator system is by DC/DC unit, the power amplifier P1 be connected with DC/DC unit, the ARM microcontroller be connected with power amplifier P1, the RS485 communication interface be connected with ARM microcontroller respectively, modulating and demodulating signal unit and tach signal conditioning unit form; Described power amplifier P1 is also connected with the former limit of rotary transformer T1, and modulating and demodulating signal unit is also connected with the secondary of rotary transformer T2, and tach signal conditioning unit is also connected with optoelectronic switch S-phase.
Described amplifier P3 is LF356BI type operational amplifier.
The utility model comparatively prior art is compared, and has the following advantages and beneficial effect:
(1) RS485 communication interface of the present utility model can directly be connected with external unit, without the need to using secondary instrument.
(2) the utility model adopts ARM microcontroller it can carry out digitized processing to measuring the signal exported, and convenient calibration, demarcates and parameter adjustment, can also improve antijamming capability and transmission range that measurement data exports simultaneously.
(3) the utility model adopts signal conversion unit, it can be transformed into frequency pulse signal voltage signal, when the frequency of the pulse signal that it converts is different when different operating mode, thus make it under different operating mode, still can keep good applicability.
(4) the utility model can be filtered undesired signal by the effect of bandreject filtering unit, avoids interference signal pulse signals and impacts.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present utility model.
Fig. 2 is signal conversion unit circuit structure diagram of the present utility model.
Fig. 3 is bandreject filtering element circuit structural drawing of the present utility model.
Embodiment
Below in conjunction with embodiment, the utility model is described in further detail, but embodiment of the present utility model is not limited to this.
Embodiment
As shown in Figure 1, the digitizing strain-type torque sensor based on rejector circuit of the present utility model, it is by fluted disc U, optoelectronic switch S, stator system, rotary transformer T1, rotary transformer T2, and rotor-support-foundation system composition.This fluted disc U is fixed on the rotor of sensor, and one end of optoelectronic switch S is connected with fluted disc U, the other end is then connected with stator system.Meanwhile, the former limit of rotary transformer T1 is connected with stator system, its secondary is then connected with rotor-support-foundation system, and the former limit of rotary transformer T2 is connected with rotor-support-foundation system, its secondary is then connected with stator system.Optoelectronic switch S coordinates fluted disc U can the speed that rotates of detection rotor, and exports corresponding frequency pulse signal to stator system.
In order to can better process the frequency pulse signal that optoelectronic switch S transports, this stator system is provided with DC/DC unit, the power amplifier P1 be connected with DC/DC unit, the ARM microcontroller be connected with power amplifier P1, the RS485 communication interface be connected with ARM microcontroller respectively, modulating and demodulating signal unit and tach signal conditioning unit form.Meanwhile, this power amplifier P1 is also connected with the former limit of rotary transformer T1, and modulating and demodulating signal unit is also connected with the secondary of rotary transformer T2, and tach signal conditioning unit is also connected with optoelectronic switch S-phase.Optoelectronic switch S by fluted disc U detection rotor rotational speed, and exports corresponding frequency pulse signal, and this frequency pulse signal flows to ARM microcontroller after tach signal conditioning unit.
External power source can for the voltage of stator system and rotor-support-foundation system by being converted to after DC/DC unit.ARM microcontroller produces 400Hz pulse signal by the PWM unit of its inside, then amplifies rear drive rotary transformer T1 through power amplifier P1, and is transferred to rotor-support-foundation system by rotary transformer T1, is processed by rotor-support-foundation system.
In order to better implement the utility model, this rotor-support-foundation system is by rectifier K, the strain resistor electric bridge be connected with rectifier K, the signal conversion unit be connected with strain resistor electric bridge, the bandreject filtering unit be connected with signal conversion unit, and form with the signal amplifier P2 that rectifier K is connected with bandreject filtering unit simultaneously.Meanwhile, rectifier K is also connected with the secondary of rotary transformer T1, and signal amplifier P2 is also connected with the former limit of rotary transformer T2.
Carry from rotary transformer T1 the signal of coming after rectifier K rectifying and voltage-stabilizing, rotor-support-foundation system working power can be supplied to.Meanwhile, the voltage signal that strain resistor electric bridge produces can be transformed to the frequency pulse signal of 10KHz by signal conversion unit.
As shown in Figure 2, it comprises amplifier P3 to the structure of this signal conversion unit, Sheffer stroke gate A1, Sheffer stroke gate A2, resistance R1, potentiometer R2, electric capacity C1, diode D1, diode D2 and polarity-inverting amplifier A3.
Wherein, the N pole of diode D2 is connected with the negative pole of amplifier P3, its P pole is then connected with the positive pole of Sheffer stroke gate A1 after polarity-inverting amplifier A3.The negative pole of Sheffer stroke gate A2 is connected with the output terminal of amplifier P3, and its positive pole is then connected with the output terminal of Sheffer stroke gate A1, and its output terminal forms the output terminal of this signal conversion unit while being then connected with the negative pole of Sheffer stroke gate A1.Structure diodes D2 thus, polarity-inverting amplifier A3, amplifier P3, Sheffer stroke gate A1 and Sheffer stroke gate A2 then form a signal converter, and after voltage signal input is come in, this converter is then converted into frequency pulse signal voltage signal.
In addition, the input end that the N pole of diode D1 is connected with the positive pole of amplifier P3, its P pole then forms this signal conversion unit, the positive pole of electric capacity C1 is connected with the P pole of diode D1, its negative pole is then connected with the negative pole of amplifier P3 after potentiometer R2, and resistance R1 is then in parallel with electric capacity C1.The negative pole of described electric capacity C1 is connected with the control end of potentiometer R2.In order to reach better implementation result, this amplifier P3 preferentially selects LF356BI type operational amplifier.
Meanwhile, the frequency pulse signal after conversion is processed by bandreject filtering unit, and the structure of this bandreject filtering unit as shown in Figure 3, it is by triode VT1, triode VT2, amplifier P4, amplifier P5, resistance R3, potentiometer R4, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, electric capacity C2, electric capacity C3 and electric capacity C4 form.
Wherein, one end of resistance R3 is connected with the collector of triode VT1, its other end is then connected with the base stage of triode VT2 after resistance R5 through potentiometer R4 in turn, electric capacity C4 is then in parallel with potentiometer R4, the positive pole of electric capacity C2 is connected with the control end of potentiometer R4, its negative pole is then connected with the base stage of triode VT1, one end of resistance R6 is connected with the base stage of triode VT1, its other end is then connected with the base stage of triode VT2, one end of resistance R7 is connected with the emitter of triode VT1, ground connection while its other end is then connected with the negative pole of amplifier P5, the negative pole of electric capacity C3 is connected with the output terminal of amplifier P4 after resistance R8, its positive pole is then connected with the positive pole of amplifier P5, between the positive pole that resistance R9 is serially connected in amplifier P5 and output terminal.
Meanwhile, the collector of described triode VT1 forms the input end of this bandreject filtering unit, and its base stage and emitter are then all connected with the positive pole of amplifier P4.The output terminal of described amplifier P4 is connected with the base stage of triode VT2, and its negative pole is then connected with the negative pole of amplifier P5.The grounded collector of described triode VT2, its emitter is then connected with the positive pole of amplifier P5.The output terminal of described amplifier P5 then forms the output terminal of this bandreject filtering unit.
Remove the frequency pulse signal after undesired signal again after signal amplifier P2 amplifies, flow to modulating and demodulating signal unit by rotary transformer T2, then be transferred to ARM microcontroller by modulating and demodulating signal unit.At this moment, ARM microcontroller is to gathering after the tach signal transmitted from pulse duration frequency signal and the optoelectronic switch S of rotor carries out the process such as digital filtering, linear gauging, digital compensation, external unit is exported to again by RS485 communication interface, and without the need to re-using secondary instrument.This RS485 communication interface can receive the data corresponding to torque and rotating speed after calibration, also can send its inner parameter of modifying of order to torque sensor, comprise sample frequency, filter factor, linear gauging parameter and messaging parameter etc.And because ARM microcontroller can the digitized processing of the communication of the amount of realization and signal, therefore factory calibration and demarcate communication interface all can be adopted to carry out at a distance, does not need to adopt human contact to carry out the parameter of Circuit tuning, resistance.
As mentioned above, just well the utility model can be implemented.
Claims (4)
1., based on a digitizing strain-type torque sensor for rejector circuit, comprise fluted disc U, optoelectronic switch S, stator system, rotary transformer T1, rotary transformer T2, and rotor-support-foundation system, one end of described optoelectronic switch S is connected with fluted disc U, the other end is then connected with stator system, the former limit of rotary transformer T1 is connected with stator system, its secondary is then connected with rotor-support-foundation system, and the former limit of rotary transformer T2 is connected with rotor-support-foundation system, its secondary is then connected with stator system, it is characterized in that, described rotor-support-foundation system is by rectifier K, the strain resistor electric bridge be connected with rectifier K, the signal conversion unit be connected with strain resistor electric bridge, the bandreject filtering unit be connected with signal conversion unit, and form with the signal amplifier P2 that rectifier K is connected with bandreject filtering unit simultaneously, described rectifier K is also connected with the secondary of rotary transformer T1, and signal amplifier P2 is also connected with the former limit of rotary transformer T2, described bandreject filtering unit is by triode VT1, triode VT2, amplifier P4, amplifier P5, one end is connected with the collector of triode VT1, the other end is then in turn through resistance R3 that potentiometer R4 is connected with the base stage of triode VT2 after resistance R5, the electric capacity C4 be in parallel with potentiometer R4, positive pole is connected with the control end of potentiometer R4, the electric capacity C2 that negative pole is then connected with the base stage of triode VT1, one end is connected with the base stage of triode VT1, the resistance R6 that the other end is then connected with the base stage of triode VT2, one end is connected with the emitter of triode VT1, the resistance R7 of ground connection while the other end is then connected with the negative pole of amplifier P5, negative pole is connected with the output terminal of amplifier P4 after resistance R8, the electric capacity C3 that positive pole is then connected with the positive pole of amplifier P5, and the resistance R9 be serially connected between the positive pole of amplifier P5 and output terminal forms, the collector of described triode VT1 forms the input end of this bandreject filtering unit, and its base stage and emitter are then all connected with the positive pole of amplifier P4, the output terminal of described amplifier P4 is connected with the base stage of triode VT2, and its negative pole is then connected with the negative pole of amplifier P5, the grounded collector of described triode VT2, its emitter is then connected with the positive pole of amplifier P5, the output terminal of described amplifier P5 then forms the output terminal of this bandreject filtering unit.
2. a kind of digitizing strain-type torque sensor based on rejector circuit according to claim 1, it is characterized in that: described signal conversion unit is by amplifier P3, Sheffer stroke gate A1, Sheffer stroke gate A2, N pole is connected with the positive pole of amplifier P3, P pole then forms the diode D1 of the input end of this signal conversion unit, positive pole is connected with the P pole of diode D1, the electric capacity C1 that negative pole is then connected with the negative pole of amplifier P3 after potentiometer R2, the resistance R1 be in parallel with electric capacity C1, and N pole is connected with the negative pole of amplifier P3, the diode D2 that P pole is then connected with the positive pole of Sheffer stroke gate A1 after polarity-inverting amplifier A3 forms, the negative pole of described electric capacity C1 is connected with the control end of potentiometer R2, the negative pole of described Sheffer stroke gate A2 is connected with the output terminal of amplifier P3, and its positive pole is then connected with the output terminal of Sheffer stroke gate A1, and its output terminal forms the output terminal of this signal conversion unit while being then connected with the negative pole of Sheffer stroke gate A1.
3. a kind of digitizing strain-type torque sensor based on rejector circuit according to claim 2, it is characterized in that: described stator system is by DC/DC unit, the power amplifier P1 be connected with DC/DC unit, the ARM microcontroller be connected with power amplifier P1, the RS485 communication interface be connected with ARM microcontroller respectively, modulating and demodulating signal unit and tach signal conditioning unit form; Described power amplifier P1 is also connected with the former limit of rotary transformer T1, and modulating and demodulating signal unit is also connected with the secondary of rotary transformer T2, and tach signal conditioning unit is also connected with optoelectronic switch S-phase.
4. a kind of digitizing strain-type torque sensor based on rejector circuit according to claim 3, is characterized in that: described amplifier P3 is LF356BI type operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520657266.3U CN204964083U (en) | 2015-08-28 | 2015-08-28 | Digital strain type torque sensor based on band stop filter circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520657266.3U CN204964083U (en) | 2015-08-28 | 2015-08-28 | Digital strain type torque sensor based on band stop filter circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204964083U true CN204964083U (en) | 2016-01-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520657266.3U Expired - Fee Related CN204964083U (en) | 2015-08-28 | 2015-08-28 | Digital strain type torque sensor based on band stop filter circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204964083U (en) |
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2015
- 2015-08-28 CN CN201520657266.3U patent/CN204964083U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160113 Termination date: 20160828 |