CN218850665U - Position detection system - Google Patents
Position detection system Download PDFInfo
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- CN218850665U CN218850665U CN202222586113.7U CN202222586113U CN218850665U CN 218850665 U CN218850665 U CN 218850665U CN 202222586113 U CN202222586113 U CN 202222586113U CN 218850665 U CN218850665 U CN 218850665U
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Abstract
The utility model relates to a position detection system, include: the device comprises a sensing unit, a difference module and a signal processing module. The sensing unit is arranged corresponding to the motor and used for sensing the change of the magnetic field and generating a position signal. The differential module is connected with the sensing unit, receives the position signal and converts the position signal into a differential signal. The signal processing module is connected with the differential module and used for processing the differential signal to obtain position information, wherein the sensing unit and the signal processing module are mutually independent. The time delay of the position signal is reduced, and the real-time performance of the signal is improved.
Description
Technical Field
The utility model relates to a motor position detection area especially relates to a position detecting system.
Background
At present, when the position of a motor is detected, an additional ARM processor is needed to receive magnetic induction data to generate position signals, the calculation process is complex, and the generated position signals are delayed to a certain degree.
Therefore, how to reduce the delay of the position signal and improve the real-time performance of the signal is an urgent problem to be solved.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned shortcomings of the related art, the present application aims to provide a position detection system, which aims to solve the problem of how to reduce the delay time of a position signal and improve the real-time performance of the signal.
A position detection system, the position detection system comprising: the device comprises a sensing unit, a difference module and a signal processing module; the sensing unit is arranged corresponding to the motor and used for sensing the change of the magnetic field to generate at least two position signals of different types; the differential module is connected with the sensing unit and used for receiving the position signal and converting the position signal into a differential signal; the signal processing module is connected with the differential module and used for processing the differential signal so as to acquire position information, wherein the sensing unit and the signal processing module are mutually independent.
The position detection system induces the change of the magnetic field of the motor through the sensing unit to generate a position signal, and the differential module is connected with the sensing unit, receives the position signal and converts the position signal into a differential signal; the signal processing module is connected with the differential module and used for processing the differential signal so as to obtain the position information, thereby reducing the time delay of the position signal and improving the real-time property of the signal.
Optionally, the sensing unit comprises: a detection unit and a processing unit; the detection unit and the processing unit are integrated into a whole or the detection unit is independent of the processing unit and is electrically connected with the processing unit, the detection unit is used for generating sensing signals according to detection conditions, and the processing unit receives the sensing signals acquired by the detection unit and processes the sensing signals to generate the position signals.
Optionally, the position signal comprises at least two of:
at least one cycle of sine and cosine signals;
at least one cycle of the pulse signal;
a PWM signal that varies periodically with angular position;
at least two periods of triangular wave signals;
at least two cycles of trapezoidal wave signals. By various output selections of the position signals, various actual calculation or detection requirements can be met.
Optionally, the position signal comprises: an A-phase pulse signal, a B-phase pulse signal and a PWM signal; wherein the phase difference between the A-phase pulse signal and the B-phase pulse signal is 90 degrees.
Optionally, the signal processing module is configured to perform pulse counting on the a-phase pulse signal and the B-phase pulse signal respectively to determine a rotation distance of the motor; the signal processing module is further used for determining the position of the motor in each rotation period according to the duty ratio of the PWM signal, and the rotation period refers to the duration of one rotation of the electromagnet.
Optionally, the position detecting system further includes a controller, a first end of the controller is connected to the signal processing module, and a second end of the controller is connected to the sensing unit, and is configured to receive the control signal from the signal processing module and transmit the control signal to the sensing unit, so as to zero the sensing unit.
Optionally, a reset button is disposed on the signal processing module and used for controlling the signal processing module to output the control signal.
Optionally, the position detection system further comprises an RS485 communication interface; and the first end of the controller is connected with the signal processing module through the RS485 communication interface.
Optionally, the controller further comprises a serial peripheral interface SPI; and the second end of the controller is connected with the sensing unit through the serial peripheral interface.
Optionally, the sensing unit is disposed on a stator shaft of the motor, and senses a magnetic field change of the motor and generates the position signal.
Drawings
Fig. 1 is a schematic structural diagram of a position detecting system according to another alternative embodiment of the present invention;
fig. 2 is a schematic diagram of an output signal of a sensing unit according to another alternative embodiment of the present invention;
fig. 3 is a schematic structural diagram of a position detecting system according to another alternative embodiment of the present invention;
description of the reference numerals:
the device comprises a sensing unit 1, a differential module 2, a signal processing module 3, a controller 4, an RS485 communication interface 5, a 6-5V power supply 7, a differential drive IC 8, a single chip microcomputer 9 and a rotor.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
In the related art, an additional ARM processor is needed to receive magnetic induction data to generate position signals, the calculation process is complex, and the generated position signals have a certain degree of time delay.
Based on this, the present application intends to provide a solution to the above technical problem, the details of which will be explained in the following embodiments.
The embodiment of the utility model provides a:
the present embodiment provides a position detection system, including: sensing unit, difference module and signal processing module. The sensing unit is arranged corresponding to the motor and used for sensing the change of the magnetic field to generate at least two different position signals; the differential module is connected with the sensing unit and used for receiving the position signal and converting the position signal into a differential signal; the signal processing module is connected with the differential module and used for processing the differential signal to obtain position information, wherein the sensing unit and the signal processing module are mutually independent.
In some examples, the sensing unit includes a detection unit and a processing unit. The detection unit and the processing unit are integrated or the detection unit is independent of the processing unit and is electrically connected with the processing unit, the detection unit is used for generating sensing signals according to detection conditions, and the processing unit receives the sensing signals acquired by the detection unit and processes the sensing signals to generate position signals. That is, the sensing unit is a magnetic sensing chip. Wherein the position signal may include at least two of: at least one cycle of sine and cosine signals; at least one cycle of a digital signal; a PWM signal that varies periodically with angular position; at least two periods of triangular wave signals; at least two cycles of trapezoidal wave signals. In other examples, the position signals may further include an a-phase pulse signal, a B-phase pulse signal, and a PWM signal; wherein the phase difference between the A-phase pulse signal and the B-phase pulse signal is 90 degrees. It should be understood that the output terminals of the processing unit of the magnetic sensing chip may correspond to the number of position signals, for example, the position signals are an a-phase pulse signal, a B-phase pulse signal and a PWM signal, and the output terminals may output the three signals simultaneously for the three output terminals respectively. Of course, an output terminal may be provided, and the three signals may be completely output in sequence through one output terminal.
In some examples, the signal processing module is configured to perform pulse counting on the a-phase pulse signal and the B-phase pulse signal, respectively, to determine a distance of rotation of the motor; the signal processing module is also used for determining the position of the motor in each rotation period according to the duty ratio of the PWM signal, and the rotation period refers to the duration of one rotation of the electromagnet.
In some examples, the position detection system may further include a controller, one end of the controller is connected to the signal processing module, and a second end of the controller is connected to the sensing unit, and the controller is configured to receive a control signal from the signal processing module and transmit the control signal to the sensing unit, so as to implement zero setting on the sensing unit. The controller sets the sensing unit to zero by receiving the control signal of the signal processing module. Wherein the input of the control signal may be a signal instruction originally preset by a user or a developer. In other examples, the control signal may be controlled by a physical key, for example, a reset button may be disposed on the signal processing module, and the signal processing module is controlled to output the control signal.
In some examples, the position detection system may also include an RS485 communication interface. Wherein the first end of the controller is connected with the signal processing module through an RS485 communication interface. In some examples, the controller may also include a serial peripheral interface SPI. The second end of the controller is connected with the sensing unit through the serial peripheral interface. Of course, the present embodiment is not limited to the RS485 communication interface and the serial peripheral interface. Other interfaces may be used for connection, signal transfer, etc.
In some examples, the position detection system further comprises a power module for supplying power to the RS485 communication interface, the controller, and the sensing unit.
In some examples, the motor further comprises a rotor, and at least one pair of permanent magnets is arranged on the rotor. The sensing unit is arranged on a stator shaft of the motor and used for sensing the magnetic field change of the motor and generating a position signal. The specific permanent magnets can be arranged into one pair, two pairs, four pairs, five pairs, seven pairs and the like. The above illustration of the logarithm of the permanent magnet is not limited to the specific logarithm of the permanent magnet, and may be set according to actual needs.
The utility model discloses another optional embodiment:
the utility model discloses a position detecting system reduces position signal's time delay, improves the real-time of signal. For ease of understanding, the position detection system of the present invention is described below in conjunction with an application scenario.
Fig. 1 is a schematic structural diagram of a position detecting system provided in this embodiment, where the position detecting system includes: the device comprises a sensing unit 1, a difference module 2 and a signal processing module 3. Wherein sensing unit 1 is corresponding to the motor setting, and sensing unit 1 includes: the device comprises a detection unit and a processing unit, wherein the detection unit and the processing unit are integrated into a whole. The processing unit receives the sensing signal acquired by the detection unit and processes and generates an a-phase pulse signal, a B-phase pulse signal and a PWM signal, wherein a schematic diagram of output signals can be shown in fig. 2. The differential module 2 is electrically connected with the sensing unit 1, receives the position signal, converts the position signal into a differential signal and sends the differential signal to the signal processing module 3, the signal processing module 3 is electrically connected with the differential module 2, and the signal processing module 3 obtains the position information after processing the differential signal.
According to the position detection system, the sensing unit senses the change of the magnetic field of the motor to directly generate the position signal, an additional processor is not needed to process the magnetic field change data to generate the position signal, the integrated sensing unit can generate the position signal, the time delay of the position information is reduced, and the testing cost is reduced. And the differential module converts the output signal of the magnetic sensor into a differential signal, so that the signal current driving capability is amplified, the anti-interference performance of the signal is enhanced, the signal processing module is ensured to correctly receive the signal, the accuracy of the position signal is improved, and the anti-interference capability of the signal is improved.
The utility model discloses still another optional embodiment:
the utility model discloses a position detecting system improves position signal's accuracy, improves the interference killing feature of signal. For ease of understanding, the position detection system of the present invention is described below in conjunction with an application scenario.
Fig. 3 is a schematic structural diagram of the position detecting system provided in this embodiment, where the position detecting system includes a motor (not shown in the figure), a sensing unit 1, a differential module, a signal processing module 3, a controller, an RS485 communication interface 5, a serial peripheral interface SPI, and a power module. Wherein the differential module is a differential driving chip IC7. Wherein the power supply module is a 5V power supply, and is marked with reference number 6 in fig. 3. The controller is a single chip 8 in this example. And the sensing unit 1 is provided corresponding to the motor, the sensing unit 1 includes: the device comprises a detection unit and a processing unit, wherein the detection unit and the processing unit are integrated into a whole. The processing unit receives the sensing signals acquired by the detection unit and processes the sensing signals to generate an A-phase pulse signal, a B-phase pulse signal and a PWM signal. Wherein the phase difference between the A-phase pulse signal and the B-phase pulse signal is 90 degrees. The differential drive IC7 is electrically connected with the sensing unit 1, converts the position signal into a differential signal and sends the differential signal to the signal processing module 3, the signal processing module 3 is electrically connected with the differential drive IC7, and the signal processing module 3 acquires the position information according to the differential signal. The first end of the single chip microcomputer 8 is connected with the signal processing module 3 through the RS485 communication interface 5, receives control of a reset button on the signal processing module 3, generates a control signal and sends the control signal to the single chip microcomputer 8, and the single chip microcomputer 8 is connected with the sensing unit 1 through a serial peripheral interface. And receiving a control signal of the signal processing module 3, transmitting the control signal to the sensing unit 1, and setting zero for the sensing unit 1. And the power module 6 is respectively electrically connected with the RS485 communication interface 5, the singlechip 8 and the sensing unit 1, and supplies power to the RS485 communication interface 5, the singlechip 8 and the sensing unit 1.
The motor in the embodiment comprises a rotor 9, the rotor 9 is provided with 7 pairs of permanent magnets, the sensing unit 1 is arranged on a rear shaft of the motor and used for sensing the magnetic field change of the motor and generating a position signal. This embodiment can real-time detection cylinder electric motor rotor's position, and come accurate control motor through pulse feedback, the motor is every to rotate a pair of permanent magnet, the A of 1024 cycles of magnetic sensor output, B looks pulse signal, because the last 7 pairs of permanent magnets that are equipped with of electric motor rotor, so the motor is every to rotate a week, magnetic sensor will output the A of 7168 cycles, B looks pulse signal, and signal processing module 3 can be to A, B looks pulse signal carries out 4 times subdivision, it is equivalent to encoding 28672 point for the distance of motor rotation a week like this, the motor can be fixed a position in real time to any one in the 28672 point, reach accurate control. And this embodiment directly carries out position signal output through the magnetic inductor, and the real-time of whole system is stronger, and controllability is better.
It should be understood that the application of the present invention is not limited to the above examples, and that modifications or changes can be made by those skilled in the art based on the above description, and all such modifications and changes are intended to fall within the scope of the appended claims.
Claims (10)
1. A position detection system, characterized in that the position detection system comprises: the device comprises a sensing unit, a difference module and a signal processing module;
the sensing unit is arranged corresponding to the motor and used for sensing the change of the magnetic field and generating at least two position signals of different types; the differential module is connected with the sensing unit and used for receiving the position signal and converting the position signal into a differential signal; the signal processing module is connected with the differential module and used for processing the differential signal so as to acquire position information, wherein the sensing unit and the signal processing module are mutually independent.
2. The position detection system according to claim 1, wherein the sensing unit includes: a detection unit and a processing unit; the detection unit is integrated with the processing unit or is independent of the processing unit and is electrically connected with the processing unit, the detection unit is used for generating sensing signals according to detection conditions, and the processing unit receives the sensing signals and processes the sensing signals to generate at least two position signals of different types.
3. The position detection system of claim 1 or 2, wherein the position signal comprises at least two of:
at least one cycle of sine and cosine signals;
at least one cycle of the pulse signal;
a PWM signal that varies periodically with angular position;
at least two periods of triangular wave signals;
at least two cycles of trapezoidal wave signals.
4. The position detection system of claim 3, wherein the position signal comprises: an A-phase pulse signal, a B-phase pulse signal and a PWM signal; wherein the phase of the A-phase pulse signal is different from that of the B-phase pulse signal by 90 deg.
5. The position detection system according to claim 4, wherein the signal processing module is configured to perform pulse counting on the a-phase pulse signal and the B-phase pulse signal, respectively, to determine a distance of rotation of the motor; the signal processing module is further used for determining the position of the motor in each rotation period according to the duty ratio of the PWM signal, and the rotation period refers to the duration of one rotation of the electromagnet.
6. The position detecting system according to claim 1, further comprising a controller, wherein a first end of the controller is connected to the signal processing module, and a second end of the controller is connected to the sensing unit, and is configured to receive the control signal from the signal processing module and transmit the control signal to the sensing unit, so as to zero the sensing unit.
7. The position detection system according to claim 6, wherein a reset button is provided on the signal processing module for controlling the signal processing module to output the control signal.
8. The position detection system of claim 6, wherein said position detection system further comprises an RS485 communication interface; and the first end of the controller is connected with the signal processing module through the RS485 communication interface.
9. The position detection system of claim 6, wherein said controller further comprises a serial peripheral interface; the serial peripheral interface is connected with the sensing unit.
10. The position detection system of claim 1,
the sensing unit is arranged on a stator shaft of the motor, senses the magnetic field change of the motor and generates the position signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222586113.7U CN218850665U (en) | 2022-09-26 | 2022-09-26 | Position detection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222586113.7U CN218850665U (en) | 2022-09-26 | 2022-09-26 | Position detection system |
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| CN218850665U true CN218850665U (en) | 2023-04-11 |
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| CN202222586113.7U Active CN218850665U (en) | 2022-09-26 | 2022-09-26 | Position detection system |
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