RU152876U1 - TURN ANGLE SENSOR - Google Patents

Abstract

1. A rotation angle sensor comprising a transducer of angular displacements into an electrical information signal made in the form of an absolute angular magnetic encoder, a supply network, an autonomous power source, a supervisor, the first input of which is connected to the supply network, and a switch, the working inputs of which are connected to the supply network and the output of an autonomous power source, characterized in that it is equipped with a microcontroller with a storage device and a block of operational amplifiers with low-impedance outputs, while the magnetic encoder based on the tunnel magnetoresistive effect, and the microcontroller with the possibility of switching to microconsumption when the supply voltage drops below the permissible value, the microcontroller power inputs, operational amplifier unit and the second supervisor input are connected to the switch output, and the magnetic encoder power input is connected to the supply the output of the microcontroller, the information outputs of the magnetic encoder are connected to the corresponding inputs of the block of operational amplifiers, the information inputs of the micro the controller connected to the low impedance outputs of the block of operational amplifiers, a control input - to the signal output of the supervisor, and an output - to a line sensor due to the recording device, either directly or via a matching ustroystvo.2. The sensor according to claim 1, characterized in that the microcontroller is configured to form a pulsed power supply to the magnetic encoder. 3. The sensor according to claim 1, characterized in that the microcontroller is configured to memorize the address of the sensor assigned by an external device via a register line�

Description

Technical field

The utility model relates to measuring technique and can be used in devices for converting a controlled value - the position of a rotating object - into electrical signals, in particular, to determine the angular position of the moving structural elements of hoisting machines.

Currently, one of the areas in measuring technology is the development of proximity sensors for the angle of rotation of rotating objects based on angular magnetic encoders. In load-lifting equipment, such sensors are used to determine the angle of rotation of the platform of the crane, the length of the telescopic boom, linear or angular movements of the load-lifting body. The design of such sensors is described, in particular, in the following patent documents:

RU 47342 U1, B66C 23/64, 08.27.2005;

RU 83131 U1, G01B 7/30, 05.20.2009;

RU 94219 U1, B66C 13/46, 05.20.2010;

RU 94332, G01C 9/06, 05/20/2010;

RU 120635 U1, B66C 13/46, 09/27/2012;

RU 133522 U1, B66C 13/12, 10.20.2013.

Angular magnetic encoders provide noise-free output signals, are resistant to external influences and can operate in a wide enough temperature range, which fully meets the requirements for measuring devices used in lifting equipment. The disadvantage of these sensors is the lack of control of the change in the position of the equipment when the external power is off. In addition, the design of these sensors is adapted to the specific nodes of the lifting machine, which complicates the replacement of the sensor in case of failure of the magnetically sensitive magnetic transducer of the magnetic encoder or the loss of the properties of a permanent magnet.

Rotary angle sensors based on angular magnetic encoders are also known, the design of which is not adapted to specific nodes of a lifting machine, for example, the LIR-MA237 small-sized absolute angular position sensor of OJSC SKB IS, St. Petersburg. The design of such a sensor is described in patent RU 2377500, G01B 21/22, G01B 7/30, 12/27/2009.

This sensor, as well as other angular magnetic encoders, commercially available by domestic and foreign companies, known to the applicant, has the same drawback as described above - the lack of control of the change in the position of the equipment when the external power is off.

The closest to the proposed utility model in terms of essential features is a rotation angle sensor containing a transducer of angular displacements into an electric information signal made in the form of an absolute angular magnetic encoder based on the Hall effect, an activator with a permanent magnet mounted on the shaft of a magnetic encoder, two reed switches, installed with the possibility of operation under the influence of the field of a permanent magnet in the sequence due to the direction of rotation of the shaft, reverse pulse counter, counting direction determining unit, scaling multiplier, adder, output characteristic adjuster, output characteristic driver, supervisor, switch, mains supply and self-contained power supply (RU 62916 U1, B66C 13/18, G01B 7/00, 05/10/2007 )

This sensor allows you to control the current position of the equipment of the lifting machine both when the external power is turned on and off, with the formation of various types of information and control signals at the output. However, the presence of reed switches for counting the number of revolutions reduces the reliability of the sensor.

Utility Model Disclosure

The problem to which the claimed utility model is directed is to create a rotation angle sensor having increased reliability while maintaining reduced power consumption when powered by an autonomous source.

Additional tasks to be solved and advantages of the proposed utility model will be clear from the following description.

The solution of this problem and the achievement of the technical result is ensured by the fact that the rotation angle sensor comprising a converter of angular displacements into an electric information signal made in the form of an absolute angular magnetic encoder, a power supply network, an autonomous power supply, a supervisor, the first input of which is connected to the power supply, and the switch, the working inputs of which are connected to the mains and the output of an autonomous power source, according to a utility model is equipped with a microcontroller with a storage device by means of a device and a block of operational amplifiers with low-impedance outputs, while the magnetic encoder is based on the tunnel magnetoresistive effect, and the microcontroller is capable of switching to microconsumption when the supply voltage decreases below the permissible value, the power inputs of the microcontroller, the block of operational amplifiers and the second input of the supervisor connected to the output of the switch, and the power input of the magnetic encoder to the power output of the microcontroller, the information outputs of the magnetic encoder are connected to the corresponding inputs of the block of operational amplifiers, the information inputs of the microcontroller are connected to the low-impedance outputs of the block of operational amplifiers, the control input to the signal output of the supervisor, and the output to the communication line of the sensor with the recording device directly or through a matching device.

The achievement of the technical result is also facilitated by the private essential features of the utility model.

The microcontroller is configured to form a pulsed power supply of the magnetic encoder.

The microcontroller is configured to store a sensor address assigned by an external device via a communication line with a recording device

The microcontroller is configured to set the sensor output to a predetermined value at a certain fixed position of the magnetic encoder shaft and to change the reference direction relative to the origin.

The microcontroller is configured to generate a digital information signal for transmission to the recording device as an alarm when the voltage of the autonomous power source decreases below an acceptable value.

The sensor is additionally equipped with elements for protection against reverse voltage, overvoltage, output short circuit and impulse noise along the power supply circuit and the sensor communication line with the recording device.

Providing the angle sensor with a microcontroller with a storage device and a block of operational amplifiers with low resistance outputs when the magnetic encoder is based on the tunnel magnetoresistive effect, and the microcontroller with the ability to switch to micro consumption mode when the voltage of the mains voltage is lower than the permissible value, reduces the power consumption of this sensor in due to the higher input impedance of the magnetic encoder converter microcircuit relative to about magnetic encoders based on Hall sensors, which is especially important when powering the sensor from an autonomous source. This makes it possible to exclude reed switches from the sensor design for counting the number of revolutions of the magnetic encoder shaft and thereby simplify the sensor design while maintaining reduced power consumption from an autonomous source.

The implementation of the microcontroller with the possibility of forming a pulsed power supply of the magnetic encoder further reduces the power consumption of the proposed sensor when it is powered from an autonomous source.

The implementation of the microcontroller with the ability to memorize the address of the sensor assigned using an external device through a communication line with a recording device, makes it possible to use the proposed sensor as part of various control systems, including load safety devices.

The implementation of the microcontroller with the ability to set the output signal of the sensor to a predetermined value at a certain fixed position of the shaft of the magnetic encoder and with the ability to change the direction of reference of the sensor relative to the origin allows you to simplify the binding of the sensor on a lifting machine, since there is no need for an initial orientation of the magnet position. The specified binding can be carried out programmatically by taking any position of the magnet for a zero value of the reference.

The implementation of the microcontroller with the possibility of generating a digital information signal for transmission to the recording device as an alarm when the voltage of the autonomous power source drops below the permissible value, allows the sensor to be serviced until it leaves its operational state, which further increases its reliability.

Providing the angle sensor with elements for protection against reverse voltage, overvoltage, output short circuit and impulse noise along the power and output circuits prevents the electronic components of the proposed sensor from malfunctioning, and also increases the reliability of data transmission to the recording device.

Achievable technical result is expressed in increasing the reliability of the sensor by simplifying its design while maintaining reduced energy consumption of the sensor when it is powered from an autonomous source.

Brief Description of the Drawings

In FIG. 1 shows a functional diagram of the proposed angle sensor; in FIG. 2 - general view of the sensor.

Utility Model Implementation

The rotation angle sensor comprises: a converter of angular displacements into an electrical information signal, made in the form of an absolute angular magnetic encoder 1 based on a tunnel magnetoresistive effect; microcontroller 2 with a storage device; block 3 operational amplifiers with low-impedance outputs; matching device 4; switch 5; supervisor 6; supply network with voltage U _pit. ; and autonomous power supply 7.

The first input of the supervisor 6 and the first working input of the switch 5 are connected to the mains. The second working input of the switch 5 is connected to the output of the autonomous power source 7. The following inputs are connected to the output of the switch 5: the second input of the supervisor 6, the power input of the unit 3 of the operational amplifiers and the power input of the microcontroller 2, to the supply output of which is connected the pulse power input of the magnetic encoder 8. Information outputs magnetic encoder 8 is connected to the corresponding inputs of the block 3 of operational amplifiers, the low-impedance outputs of which are connected to the information inputs of the microcontroller 2. The control input of the microcontroller and connected to the signal output of the supervisor 6, and the output to the communication line of the sensor with the recording device through the matching device 4.

The microcontroller 2 is configured to:

transition to micro-consumption mode when the voltage value of the mains drops below the permissible value;

forming a pulse power supply of the magnetic encoder;

storing the address of the sensor assigned using an external device via a communication line with a recording device;

setting the output signal of the sensor to a predetermined value at a certain fixed position of the shaft of the magnetic encoder and changing the reference direction relative to the origin;

the formation of a digital information signal for transmission to the recording device as an alarm when the voltage of the stand-alone power source drops below an acceptable value.

The sensor can also be equipped with elements for protection against reverse voltage, overvoltage, output short circuit and impulse noise along the power supply circuit and the sensor's communication line with the recording device.

Magnetic encoder 1 includes a sensitive element in the form of an integrated transducer microcircuit 8 and a permanent magnet 10 mounted on the shaft 9 of the magnetic encoder with a gap relative to the sensitive element, the magnetic induction lines of which are parallel to the plane of the converter microcircuit. The magnet 10 has a cylindrical shape and a diametrical magnetization.

The matching device 4 includes in general a standard serial interface controller, for example CAN, and a transceiver of this interface for connecting to a common serial interface channel. In the case where the microcontroller 2 comprises a serial interface controller, then the matching device 4 may include only a serial interface transceiver.

The switch 5 is made on two opposite directional diodes 11 and 12, the anodes of which are connected to the working inputs of the switch, and the cathodes are interconnected and connected to the output of the switch.

The sensor operates as follows.

When rotating the shaft 9 of the magnetic encoder 1, connected, for example, to the shaft of the equipment of the lifting machine, the converter chip 8, based on the tunnel magnetoresistive effect, reads the angular position of the permanent magnet 10. At the output of the converter chip 8, SIN and COS quadrature signals from the angle of rotation of the magnet 10 relative to the sensitive axis of the sensor. The signals amplified in block 3 are fed to the inputs of microcontroller 2. Microcontroller 2 converts these signals into a code that carries information about the absolute angular position of the equipment of the hoisting machine. Further conversion of the basic signal allows you to receive output signals of various formats.

Industrial applicability

The proposed sensor can be manufactured industrially at the instrument-making plant using modern electronic components and technologies.

Microcontroller 2 can be implemented on the basis of the MSP430F149 chip from Texas Instruments (USA), which includes an analog-to-digital converter for converting SIN and COS analog signals to digital, and as a magnetosensitive converter chip 8 of magnetic encoder 1, you can use the microchip MMA253F Transducer from MultiDimension Technology Co., Ltd.

You can use, for example, MCP2515 chips or SJA1000 chips as a serial interface controller, and SN65HVD1040 or ISO1050DUB chips (if you use a CAN interface bus) as serial interface transceivers. In addition, matching device 4 can be made on the basis of a specialized chip TJA1050T.

The microcontroller 2 can also be implemented on the basis of a single chip, including a device matching with the communication line.

As a standalone power source 7 can be used, for example, a lithium battery SL-360 / PT.

Claims (6)

1. A rotation angle sensor comprising a transducer of angular displacements into an electrical information signal made in the form of an absolute angular magnetic encoder, a supply network, an autonomous power source, a supervisor, the first input of which is connected to the supply network, and a switch, the working inputs of which are connected to the supply network and the output of an autonomous power source, characterized in that it is equipped with a microcontroller with a storage device and a block of operational amplifiers with low-impedance outputs, while the magnetic encoder based on the tunnel magnetoresistive effect, and the microcontroller with the possibility of switching to microconsumption when the supply voltage drops below the permissible value, the microcontroller power inputs, operational amplifier unit and the second supervisor input are connected to the switch output, and the magnetic encoder power input is connected to the supply the output of the microcontroller, the information outputs of the magnetic encoder are connected to the corresponding inputs of the block of operational amplifiers, the information inputs of the micro the controller connected to the low impedance outputs of the block of operational amplifiers, a control input - to the signal output of the supervisor, and an output - to a line sensor due to the recording device, either directly or through a matching device. 2. The sensor according to claim 1, characterized in that the microcontroller is configured to form a pulsed power supply to the magnetic encoder. 3. The sensor according to claim 1, characterized in that the microcontroller is configured to store a sensor address assigned by an external device via a communication line with a recording device. 4. The sensor according to claim 1, characterized in that the microcontroller is configured to set the output signal of the sensor to a predetermined value at a certain fixed position of the magnetic encoder shaft and with the possibility of changing the reference direction relative to the origin. 5. The sensor according to claim 1, characterized in that the microcontroller is configured to generate a digital information signal for transmission to the recording device as an alarm when the voltage of the autonomous power source decreases below an acceptable value. 6. The sensor according to claim 1, characterized in that it is additionally equipped with elements for protection against reverse voltage, overvoltage, output short circuit and impulse noise along the power supply circuit and the sensor communication line with the recording device.

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