CN112345135A - Non-contact dynamic torque sensor - Google Patents
Non-contact dynamic torque sensor Download PDFInfo
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- CN112345135A CN112345135A CN201910733052.2A CN201910733052A CN112345135A CN 112345135 A CN112345135 A CN 112345135A CN 201910733052 A CN201910733052 A CN 201910733052A CN 112345135 A CN112345135 A CN 112345135A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L3/00—Measuring torque, work, mechanical power, or mechanical efficiency, in general
- G01L3/02—Rotary-transmission dynamometers
- G01L3/04—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft
- G01L3/10—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating
- G01L3/101—Rotary-transmission dynamometers wherein the torque-transmitting element comprises a torsionally-flexible shaft involving electric or magnetic means for indicating involving magnetic or electromagnetic means
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Abstract
The invention discloses a non-contact dynamic torque sensor, which comprises a stator frame, a rotor and a high-speed bearing, wherein the stator frame is provided with a stator core; the stator frame and the rotor transmit signals and energy in a non-contact mode; the rotor comprises an elastic shaft, a sensing element, a signal processing circuit unit and a rotor coil; the sensing element is used for detecting mechanical deformation generated on the elastic shaft and outputting a corresponding signal; the signal processing unit is used for processing the signal output by the sensitive element to drive the rotor coil; the stator base comprises a main circuit unit, a stator coil, a shell and a circuit interface, wherein the stator coil is coupled and fixed with the rotor coil in a manner of being coaxial with the rotor coil; the main circuit unit is fixed in an electronic bin of the stator base, and a circuit interface is used for connecting a lead; the main circuit unit is used for supplying power to the stator coil, and converting and outputting the detected current of the stator coil. The invention has the advantages of longer service life, higher working reliability and wider application range.
Description
Technical Field
The invention relates to the field of sensors, in particular to a non-contact dynamic torque sensor.
Background
At present, torque is the most frequently involved parameter in a rotating power system, and in order to dynamically detect the rotating torque, a torsion angle phase difference type sensor is used more frequently. Two sets of gears with the same tooth number, shape and mounting angle are mounted at two ends of the elastic shaft, and one proximity sensor (a magnetic sensor or an optical sensor) is mounted outside each gear. When the elastic shaft rotates, the two groups of sensors can measure two groups of pulse waves, and the torque quantity borne by the elastic shaft can be calculated by comparing the phase difference of the front edge and the back edge of the two groups of pulse waves. The method has the advantages that the detection signal is a digital signal, and the non-contact transmission of the torque signal can be realized. However, this structure has several drawbacks:
1. the volume is large, and the installation is not easy;
2. the front edge and the rear edge of the pulse wave are slow and difficult to compare when the rotating speed is low, and meanwhile, due to the limitation of timing time, the low-speed performance is not ideal, and a measurement dead zone exists;
3. because of adopting the phase comparison principle, the method is sensitive to signal edges, interference pulses existing in the use environment easily influence the measurement result, and are not easy to eliminate.
In addition, other schemes exist in the prior art, for example, the detection means is a strain gauge electrical measurement technology, and the strain gauge electrical measurement device has the advantages of high precision, fast frequency response, good reliability, long service life and the like. The torsion-measuring strain gauge is adhered to an elastic shaft to be measured by using strain glue to form a strain bridge, and an electric signal of torsion of the elastic shaft can be tested if working power is supplied to the strain bridge. Since the slip rings are in frictional contact, wear and heat are inevitably generated, which limits the rotational speed of the rotating shaft and the lifespan of the slip rings. And the contact is unreliable to cause signal fluctuation, so that the measurement error is large and even the measurement is unsuccessful.
In order to overcome the defects of the conductive slip ring, a radio telemetering method is adopted, namely a torque strain signal is amplified on a rotating shaft and subjected to V/F conversion into a frequency signal, the frequency signal is transmitted from the rotating shaft to the outside of the shaft by a radio transmission method through carrier modulation, and then a signal of the torsion of the rotating shaft can be obtained by a radio receiving method. The power supply on the rotating shaft is a battery fixed to the rotating shaft. The method is a telemetering torquemeter which overcomes two defects of an electric slip ring, but has the following defects:
1. is susceptible to interference from electromagnetic waves in the field;
2. because the power is supplied by a battery, the solar energy collector can be used only for a short time;
3. the structure is added on the rotating shaft, so that the dynamic balance problem at high rotating speed is easily caused, and the structure is more prominent in small-range and small-diameter shafts.
In summary, the current dynamic torque sensor needs to be improved, and needs to improve the service life and the working reliability, improve the anti-interference performance, and expand the application range.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a non-contact dynamic torque sensor to overcome the above-mentioned defects in the prior art.
The invention solves the technical problems through the following technical scheme:
a non-contact dynamic torque sensor comprises a stator frame, a rotor and a high-speed bearing; the high-speed bearing is arranged on the stator base, the rotor is arranged on the high-speed bearing, and signals and energy are transmitted between the stator base and the rotor in a non-contact mode;
the rotor comprises an elastic shaft, a sensing element, a signal processing circuit unit and a rotor coil; the sensing element is fixed on the elastic shaft and used for detecting mechanical deformation generated on the elastic shaft and outputting a corresponding signal;
the signal processing circuit unit is respectively connected with the sensitive element and the rotor coil; the signal processing unit is used for processing the signal output by the sensitive element so as to drive the rotor coil; the rotor coil is used for receiving energy and supplying power to the signal processing circuit unit;
the stator base comprises a main circuit unit, a stator coil, a shell and a circuit interface, wherein the stator coil is fixed in the shell and is coupled and fixed with the rotor coil in a manner of being coaxial with the rotor coil; the main circuit unit is fixed in an electronic bin of the stator base, and the circuit interface is used for connecting an external lead;
the stator coil is connected with the main circuit unit, and the main circuit unit is used for supplying power to the stator coil, converting and outputting the detected current of the stator coil.
Preferably, the sensitive element is a strain gauge.
Preferably, the signal processing unit is configured to amplify and frequency-modulate the signal output by the sensing element.
Preferably, the main circuit unit is configured to convert the current of the stator coil into an analog voltage signal or an analog current signal.
Preferably, the main circuit unit further includes an RS485 interface (a digital interface using ModBus protocol) or a CAN interface (a digital interface using CANopen protocol).
Preferably, the main circuit unit is configured to convert a current of the stator coil into a digital signal.
Preferably, the main circuit unit and the signal processing circuit unit transmit signals and energy in the form of coil coupling.
Preferably, the signal transmitted between the main circuit unit and the signal processing circuit unit is a frequency signal.
Preferably, the stator frame is made of aluminum alloy.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The positive progress effects of the invention are as follows: compared with the prior art, the invention adopts a non-contact mode to transmit signals and energy, improves the service life and the working reliability, and has wide application range, such as the detection of the output torque and the power of rotary power equipment such as a motor, an engine, an internal combustion engine and the like, the detection of the torque and the power of a fan, a water pump, a gear box and a torque wrench, and the detection of the torque and the power in a railway locomotive, an automobile, a tractor, an airplane, a ship and mining machinery.
Drawings
Fig. 1 is a schematic overall structural diagram of a contactless torque sensor according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of an internal structure of a contactless torque sensor according to an embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
As shown in fig. 1-2, the present embodiment provides a non-contact dynamic torque sensor, which includes a stator frame 10, a rotor, and a high-speed bearing 1; the high-speed bearing 1 is arranged on the stator base 10, the rotor is arranged on the high-speed bearing 1, and signals and energy are transmitted between the stator base 10 and the rotor in a non-contact mode.
The rotor comprises an elastic shaft 7, a sensing element 5, a signal processing circuit unit 4 and a rotor coil 2; the sensing element 5 is fixed on the elastic shaft 7 and used for detecting mechanical deformation generated on the elastic shaft 7 and outputting a corresponding signal.
The signal processing circuit unit 4 is respectively connected with the sensitive element 5 and the rotor coil 2; the signal processing unit 4 is used for processing the signal output by the sensitive element 5 to drive the rotor coil 2; the rotor coil 2 is used for receiving energy and supplying power to the signal processing circuit unit 4;
the stator base 10 comprises a main circuit unit 8, a stator coil 3, a housing and a circuit interface 9, wherein the stator coil 3 is fixed in the housing and is tightly coupled and fixed with the rotor coil 2 in a manner of being coaxial with the rotor coil 2; the main circuit unit 8 is fixed in an electronic cabin of the stator base 10, and the circuit interface 9 is used for connecting an external lead.
The stator coil 3 is connected to the main circuit unit 8, and the main circuit unit 8 is configured to supply power to the stator coil 3, and convert and output the detected current of the stator coil 3.
In this embodiment, when the shaft of the rotor has torque transmitted, the elastic shaft generates mechanical deformation, the sensing element detects the deformation and outputs a corresponding signal, and the signal processing circuit unit processes the signal to drive the rotor coil. The main circuit unit detects the current signal change, extracts frequency signals from the current signal change, processes the frequency signals into standard signals and outputs the standard signals. Wherein, the output standard signal is in linear relation with the torque loaded on the elastic shaft of the rotor.
In an alternative embodiment, the signal processing unit 4 is configured to amplify and frequency modulate the signal output by the sensor 5.
In an alternative embodiment, an external acquisition module connected to the contactless dynamic torque sensor supports voltage input, and the main circuit unit 8 is configured to convert the current of the stator coil 3 into an analog voltage signal, for example, after the dynamic torque sensor acquires a torque, a voltage signal of 0 to ± 5V or 0 to ± 10V is output.
In an alternative embodiment, the external acquisition module connected to the contactless dynamic torque sensor supports current input, and the main circuit unit 8 is configured to convert the current of the stator coil 3 into an analog current signal, for example, after the dynamic torque sensor acquires a torque, a current signal of 4 to 20mA is output, where 12mA corresponds to a zero point.
In an optional embodiment, the main circuit unit 8 further includes an RS485 interface or a CAN interface.
In an alternative embodiment, an external acquisition module connected to the contactless dynamic torque sensor supports digital input, and the main circuit unit 8 is used to convert the current of the stator coil 3 into a digital signal. In this embodiment, the digital signal output by the dynamic torque sensor after acquiring the torque is a signed number, and the maximum value corresponds to the full-scale range.
It should be understood that the main circuit unit 8 includes a CPU therein for timing and counting the received signals, then processing the received signals in detail according to the calibration configuration, and converting the signals into analog voltage signals, analog current signals, or digital signals for output.
The CPU may be STM32F103 manufactured by ST corporation (intentionally produced by semiconductor corporation), or a similar functional product of another corporation. The STM32F103 is a 32-bit single chip microcomputer with relatively strong functions, and has extremely high performance, a mainstream Cortex kernel (a processor kernel), a plurality of peripherals, excellent real-time performance and extremely low development cost.
In an alternative embodiment, the sensor 5 is a strain gauge.
In an alternative embodiment, the main circuit unit 8 and the signal processing circuit unit 4 transmit signals and energy in the form of coil coupling.
In an alternative embodiment, the signal transmitted between the main circuit unit 8 and the signal processing circuit unit 4 is a frequency signal.
In an alternative embodiment, the material of the stator frame 10 is an aluminum alloy.
The following describes the method of using the non-contact dynamic torque sensor provided by the invention:
and S1, selecting a proper range and a proper connection mode, and installing the non-contact dynamic torque sensor between the power source and the load, wherein the coaxial connection is ensured.
And S2, connecting the lead to an external acquisition module (such as a PLC and an acquisition card).
And S3, starting a power source part, and driving the non-contact dynamic torque sensor and the load.
And S4, the acquisition module acquires signals output by the non-contact dynamic torque sensor.
The non-contact dynamic torque sensor provided by the embodiment adopts a non-contact mode to transmit signals and energy, so that the service life and the working reliability are improved, and the application range is wide, for example, the detection of the output torque and power of rotary power equipment such as a motor, an engine and an internal combustion engine, the detection of the torque and power of a fan, a water pump, a gear box and a torque wrench, and the detection of the torque and power in a railway locomotive, an automobile, a tractor, an airplane, a ship and mining machinery.
In addition, the rotor in the non-contact dynamic torque sensor is small in size, compact in structure, small in rotational inertia and small in additional torque of the rotor.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (9)
1. A non-contact dynamic torque sensor is characterized by comprising a stator frame, a rotor and a high-speed bearing; the high-speed bearing is arranged on the stator base, the rotor is arranged on the high-speed bearing, and signals and energy are transmitted between the stator base and the rotor in a non-contact mode;
the rotor comprises an elastic shaft, a sensing element, a signal processing circuit unit and a rotor coil; the sensing element is fixed on the elastic shaft and used for detecting mechanical deformation generated on the elastic shaft and outputting a corresponding signal;
the signal processing circuit unit is respectively connected with the sensitive element and the rotor coil; the signal processing unit is used for processing the signal output by the sensitive element so as to drive the rotor coil; the rotor coil is used for receiving energy and supplying power to the signal processing circuit unit;
the stator base comprises a main circuit unit, a stator coil, a shell and a circuit interface, wherein the stator coil is fixed in the shell and is coupled and fixed with the rotor coil in a manner of being coaxial with the rotor coil; the main circuit unit is fixed in an electronic bin of the stator base, and the circuit interface is used for connecting an external lead;
the stator coil is connected with the main circuit unit, and the main circuit unit is used for supplying power to the stator coil, converting and outputting the detected current of the stator coil.
2. The contactless dynamic torque sensor of claim 1, wherein the sensing element is a strain gauge.
3. The contactless dynamic torque sensor according to claim 1, wherein the signal processing unit is configured to amplify and frequency modulate the signal output from the sensing element.
4. The contactless dynamic torque sensor according to claim 1, wherein the main circuit unit is configured to convert a current of the stator coil into an analog voltage signal or an analog current signal.
5. The contactless dynamic torque sensor according to claim 1, wherein the main circuit unit further includes an RS485 interface or a CAN interface.
6. The contactless dynamic torque sensor according to claim 5, wherein the main circuit unit is configured to convert a current of the stator coil into a digital signal.
7. The contactless dynamic torque sensor according to claim 1, wherein the main circuit unit and the signal processing circuit unit transfer signals and energy therebetween in the form of coil coupling.
8. The contactless dynamic torque sensor according to claim 1, wherein the signal transmitted between the main circuit unit and the signal processing circuit unit is a frequency signal.
9. The contactless dynamic torque transducer according to claim 1, wherein the stator frame is made of an aluminum alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910733052.2A CN112345135A (en) | 2019-08-09 | 2019-08-09 | Non-contact dynamic torque sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910733052.2A CN112345135A (en) | 2019-08-09 | 2019-08-09 | Non-contact dynamic torque sensor |
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| Publication Number | Publication Date |
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| CN112345135A true CN112345135A (en) | 2021-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910733052.2A Pending CN112345135A (en) | 2019-08-09 | 2019-08-09 | Non-contact dynamic torque sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113465801A (en) * | 2021-08-14 | 2021-10-01 | 东莞市南力测控设备有限公司 | Non-contact magnetic coupling torque sensor |
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2019
- 2019-08-09 CN CN201910733052.2A patent/CN112345135A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113465801A (en) * | 2021-08-14 | 2021-10-01 | 东莞市南力测控设备有限公司 | Non-contact magnetic coupling torque sensor |
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