CN211697851U - Motor rotating speed measuring device - Google Patents
Motor rotating speed measuring device Download PDFInfo
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- CN211697851U CN211697851U CN201922260172.3U CN201922260172U CN211697851U CN 211697851 U CN211697851 U CN 211697851U CN 201922260172 U CN201922260172 U CN 201922260172U CN 211697851 U CN211697851 U CN 211697851U
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Abstract
The embodiment of the application provides a motor speed measuring device, includes: the device comprises a Hall element, a preprocessing module and a single chip microcomputer; the output end of the Hall element is electrically connected with the input end of the preprocessing module; a sensor signal panel is fixed on the motor rotating shaft corresponding to the Hall element and is used for generating an alternating signal corresponding to the rotating speed of the motor on the Hall element; the output end of the preprocessing module is electrically connected with the input end of the single chip microcomputer; the preprocessing module is used for shaping the alternating signal to output a pulse signal which can be identified by the single chip; the single chip microcomputer is used for determining a rotating speed value according to the pulse signal, and the rotating speed value is used for expressing the rotating speed of the motor. The problem that the rotating speed of the motor cannot be measured for a long time effectively by using a traditional motor rotating speed measuring method is solved.
Description
Technical Field
The application relates to the technical field of electronics, in particular to a motor rotating speed measuring device.
Background
At present, the general motor speed measuring mode in the market is divided into two types: 1. contact type: the measuring method needs to consider the contact pressure in the measuring process, and the biggest defect of the measuring method is the examination of the contact surface. In addition, the contact measurement method is a mechanical measurement method, and is prone to generating an unstable situation (mechanism test), so that the contact measurement method needs to be fixed. It is not suitable for high rotation speed schemes. 2. The non-contact measurement mode using the optical principle is adopted, but the light measuring surface of the sensor used on a long-time test scheme needs to be wiped. Therefore, the two measurement modes need frequent maintenance after long-term use.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a motor rotating speed measuring device, and the problem that equipment needs frequent maintenance under the condition of measuring the rotating speed for a long time is prevented.
The embodiment of the application provides a motor speed measuring device, includes: the device comprises a Hall element, a preprocessing module and a single chip microcomputer; the output end of the Hall element is electrically connected with the input end of the preprocessing module; a sensor signal panel is fixed on the motor rotating shaft corresponding to the Hall element and is used for generating an alternating signal corresponding to the rotating speed of the motor on the Hall element; the output end of the preprocessing module is electrically connected with the input end of the single chip microcomputer; the preprocessing module is used for shaping the alternating signal to output a pulse signal which can be identified by the single chip; the single chip microcomputer is used for determining a rotating speed value according to the pulse signal, and the rotating speed value is used for expressing the rotating speed of the motor.
In one embodiment, further comprising a display; the input end of the display is electrically connected with the first output end of the singlechip; the display displays at least the rotation speed value.
In one embodiment, the device further comprises an alarm device; the input end of the alarm device is electrically connected with the second output end of the singlechip; when the rotating speed value is larger than a preset rotating speed value, the single chip microcomputer sends an alarm signal to the alarm device; and the alarm device is used for controlling the buzzer to sound when receiving the alarm signal.
In one embodiment, the sensor signal pad is a magnetic steel block; the Hall element is fixed on a bottom plate of the motor, and a Hall probe of the Hall element corresponds to the magnetic steel block so as to receive a magnetic signal generated by the magnetic steel block.
In one embodiment, the single chip microcomputer comprises a first processing module; the first processing module is used for obtaining the time difference of the adjacent pulse signals and taking the reciprocal of the time difference as the rotating speed value.
In one embodiment, the single chip microcomputer comprises a second processing module; the second processing module comprises at least a timer; wherein the timer is used for determining the time period of the rotation speed calculation; the second processing module is used for determining the rotating speed value according to the time period and the number of the received pulse signals in the corresponding time period.
In one embodiment, the time period is 1 second.
In one embodiment, the rotation speed value of the target time period is an average of the respective rotation speed values of the corresponding time periods thereof.
In one embodiment, the rotational speed value of the target time period is an average of its respective rotational speed values for 3 consecutive time periods.
In one embodiment, the single chip microcomputer comprises a feedback control module; the feedback control module is used for sending a control signal to a control circuit according to the rotating speed value and a preset rotating speed value; the control circuit is used for controlling an electric signal on a main circuit where the motor is located according to the control signal.
In the embodiment of the application, the device converts the rotation motion of the motor spindle into a corresponding alternating signal through a Hall element, and then shapes the alternating signal through the preprocessing module to output a pulse signal which can be identified by the singlechip. And calculating to obtain a rotating speed value according to the pulse signal, wherein the rotating speed value is used for representing the rotating speed of the motor in the current time period. The internal resources of the single chip microcomputer are fully utilized, the Hall element utilizes the magnetic principle, the maintenance problem is solved, the defects of measurement in the traditional method are overcome, and the precision measurement of different sections of the rotating speed of the motor is realized. The motor rotating speed measuring device has the advantages of high measuring speed and high measuring precision.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without any creative effort.
FIG. 1 is a schematic diagram of a motor speed measurement device according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a motor rotation speed control flow according to an embodiment of the present disclosure.
Reference numerals of the above figures: 1. a motor; 2. a Hall element; 3. a preprocessing module; 4. a single chip microcomputer; 5. a display; 6. and an alarm device.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It will be understood that when an element is referred to as being "electrically connected" to another element, it can be directly electrically connected to the other element or intervening elements may also be present.
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.
The embodiment of the present specification provides a device for measuring the rotating speed of a motor 1, including: the device comprises a Hall element 2, a preprocessing module 3 and a singlechip 4; the output end of the Hall element 2 is electrically connected with the input end of the preprocessing module 3; a sensor signal panel is fixed on the rotating shaft of the motor 1 corresponding to the Hall element 2, and is used for generating an alternating signal corresponding to the rotating speed of the motor 1 on the Hall element 2; the output end of the preprocessing module 3 is electrically connected with the input end of the singlechip 4; the preprocessing module 3 is used for shaping the alternating signal to output a pulse signal which can be identified by the singlechip 4; the single chip microcomputer 4 is used for determining a rotating speed value according to the pulse signal, and the rotating speed value is used for representing the rotating speed of the motor 1.
In the present embodiment, the hall element 2 may be a magnetic sensor based on the hall effect. They can be used to detect magnetic fields and their changes and can be used in various fields related to magnetic fields. The sensor signal panel can be a magnetic steel sheet coaxially connected with a crankshaft of the motor 1. Specifically, the hall element 2 may be fixed to a bottom plate of the motor 1, a magnetic steel block is fixed to a shaft of the motor 1 opposite to the hall probe, and the hall sensor sends an alternating signal every revolution of the motor 1. The alternating signal may refer to a signal having a certain regularity, such as a pulse signal, which is alternately changed.
In this embodiment, the preprocessing module 3 may be an isolation shaping circuit, and is configured to shape the alternating signal to output a pulse signal that can be recognized by the single chip microcomputer 4. Specifically, an amplifier or the like may be included to convert the input alternating signal into a regularly stable rectangular pulse signal.
In this embodiment, the single chip 4 may be an integrated circuit chip, and may be a small and perfect microcomputer system formed by integrating functions (which may further include a display driving circuit, a pulse width modulation circuit, an analog multiplexer, an a/D converter, and the like) of a central processing unit CPU, a random access memory RAM, a read only memory ROM, various I/O ports, an interrupt system, a timer/counter, and the like with data processing capability onto a silicon chip by using a very large scale integrated circuit technology.
In this embodiment, the single chip microcomputer 4 determines a rotation speed value according to the pulse signal. Specifically, for example, the time difference between adjacent pulse signals is obtained, and the reciprocal of the time difference is taken as the rotation speed value. If the first pulse starts at 0 second and the second pulse actually starts at 0.1 second, the corresponding rotation speed is equal to 1/(0.1-0) at 0-0.1 second and 10 r/s. For another example, the time period determined by the single chip microcomputer 4 is 1 second, 10 pulse signals are received when 0-1 second, 11 pulse signals are received when 1-2 second, and 12 pulse signals are received when 2-3 second, and then the corresponding rotating speeds are 10r/s, 11r/s, and 12r/s respectively. Correspondingly, the rotation speed value 11r/s at 0-3 seconds can be obtained by averaging, and the rotation speed value is used for representing the rotation speed of the motor 1 in the time period.
In the present embodiment, the hall element 2 has the advantages of firm structure, small volume, light weight, long service life, convenient installation, etc. When the motor 1 rotates, the sensor signal panel is driven to move, alternating signals with corresponding frequencies are generated, and the alternating signals are output to a counter or other pulse counting devices after signal processing so as to measure the rotating speed. In the present embodiment, the single chip microcomputer 4 can implement an automatic determination test for measuring the rotation speed of the motor 1 through a crystal oscillator circuit, a reset circuit, a corresponding interface circuit, and the like.
Please refer to fig. 1, which is a detailed implementation scenario of the present disclosure. In the example of the scene, the device is composed of a hall element 2, a signal preprocessing module 3, a single chip microcomputer 4, a display 5 and an alarm device 6. The hall element 2 converts the rotational speed of the motor 1 into an alternating signal. The signal preprocessing module 3 comprises a to-be-detected signal amplifying circuit, a waveform converting circuit, a waveform shaping circuit and the like, wherein the amplifier amplifies the to-be-detected signal, reduces the amplitude requirement on the to-be-detected signal and realizes the measurement of a small signal; the waveform conversion and shaping circuit realizes the conversion of the alternating signal into a pulse signal which can be identified by the singlechip 4. The single chip 4 sends the rotation speed value to the display 5 after processing the rotation speed value, and the display 5 can dynamically display by adopting an 8-bit LED nixie tube.
In the present scenario, a rotation speed value is preset to be 5000r/s, and after the single chip microcomputer 4 calculates and obtains the rotation speed value, the rotation speed value is compared with the preset rotation speed value. And when the speed is more than 5000r/s, the singlechip 4 sends an alarm signal to the alarm device 6. And the alarm device 6 controls the buzzer to sound when receiving the alarm signal.
In another implementation scenario, after the device is started, after the hall sensor detects that a pulse arrives, the single chip microcomputer 4 starts external interruption, and the number of pulses is recorded once every pulse is interrupted. And simultaneously starting a timer to work, and reading the number of recorded pulses by timing interruption every 1 second. Sampling is carried out for three times continuously, and the average value is recorded as a primary rotating speed value. And judging the numerical value, alarming and returning to the initialization stage if the numerical value is higher than 5000r/s, and otherwise, judging the normal speed value.
Referring to fig. 2, in another implementation scenario, the rotation speed of the motor 1 may also be controlled. In the example of the scenario, the device starts to start, a speed command is input, the motor 1 returns to zero, the sensor (hall element 2) senses the position of the disc at that time, the timer is started, and the number of turns is judged. Comparing with the input preset rotating speed value to judge the rotating speed difference.
In the present scenario example, when the current rotation speed is less than the preset rotation speed value, the motor 1 maintains the current rotation speed to operate. When the current rotating speed is greater than the preset rotating speed value, a control signal can be sent to the control circuit; the control circuit can control the on-off of the circuit of the main circuit of the motor 1 and the like.
In one embodiment, the device for measuring the rotation speed of the motor 1 may further include a display 5; the input end of the display 5 is electrically connected with the first output end of the singlechip 4; the display 5 displays at least the rotation speed value. In particular, the display 5 may be an LCD liquid crystal display 5.
In one embodiment, the device for measuring the rotating speed of the motor 1 can further comprise an alarm device 6; the input end of the alarm device 6 is electrically connected with the second output end of the singlechip 4; when the rotating speed value is larger than a preset rotating speed value, the single chip microcomputer 4 sends an alarm signal to the alarm device 6; and the alarm device 6 is used for controlling a buzzer of the alarm device to sound when receiving the alarm signal. Specifically, for example, when the rotation speed value obtained by the processing of the single chip microcomputer 4 is greater than a preset rotation speed value, the single chip microcomputer 4 sends an alarm signal to the alarm device 6, and an alarm is given through a buzzer.
In one embodiment, the sensor signal pad is a magnetic steel block; the Hall element 2 is fixed on a bottom plate of the motor 1, and a Hall probe of the Hall element corresponds to the magnetic steel block so as to receive a magnetic signal generated by the magnetic steel block.
In one embodiment, the single chip 4 includes a first processing module; the first processing module is used for obtaining the time difference of the adjacent pulse signals and taking the reciprocal of the time difference as the rotating speed value.
In one embodiment, the single chip 4 includes a second processing module; the second processing module comprises at least a timer; wherein the timer is used for determining the time period of the rotation speed calculation; the second processing module is used for determining the rotating speed value according to the time period and the number of the received pulse signals in the corresponding time period.
In one embodiment, the time period is 1 second. Specifically, after the device is started, the single chip microcomputer 4 starts external interruption, and the number of pulses is recorded once every pulse is interrupted. And simultaneously starting a timer to work, and reading the number of recorded pulses by timing interruption every 1 second.
In one embodiment, the rotation speed value of the target time period is an average of the respective rotation speed values of the corresponding time periods thereof. Specifically, for example, if the target time period is 1 to 5 seconds and the time period is 1 second, the target time period is divided into 1 to 2 seconds, 2 to 3 seconds, 3 to 4 seconds, and 3 time periods, the rotation speed value corresponding to each time period is calculated corresponding to each time period, and the average rotation speed value is obtained.
In one embodiment, the rotational speed value of the target time period is an average of its respective rotational speed values for 3 consecutive time periods.
In one embodiment, the single-chip 4 includes a feedback control module; the feedback control module is used for sending a control signal to a control circuit according to the rotating speed value and a preset rotating speed value; wherein the control circuit is configured to control an electrical signal on a main circuit on which the motor 1 is located according to the control signal.
It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not intended to forego the subject matter and should not be construed as an admission that the applicant does not consider such subject matter to be part of the disclosed subject matter.
Claims (6)
1. A motor rotating speed measuring device is characterized in that; the method comprises the following steps: the device comprises a Hall element, a preprocessing module and a single chip microcomputer;
the output end of the Hall element is electrically connected with the input end of the preprocessing module; a sensor signal panel is fixed on the motor rotating shaft corresponding to the Hall element and is used for generating an alternating signal corresponding to the rotating speed of the motor on the Hall element;
the output end of the preprocessing module is electrically connected with the input end of the single chip microcomputer; the preprocessing module is used for shaping the alternating signal to output a pulse signal which can be identified by the single chip;
the single chip microcomputer is used for determining a rotating speed value according to the pulse signal, and the rotating speed value is used for expressing the rotating speed of the motor.
2. The motor speed measurement device of claim 1, further comprising a display;
the input end of the display is electrically connected with the first output end of the singlechip; the display displays at least the rotation speed value.
3. The motor speed measuring device of claim 1, further comprising an alarm device;
the input end of the alarm device is electrically connected with the second output end of the singlechip; when the rotating speed value is larger than a preset rotating speed value, the single chip microcomputer sends an alarm signal to the alarm device; and the alarm device is used for controlling the buzzer to sound when receiving the alarm signal.
4. The motor rotation speed measuring apparatus according to claim 1,
the sensor signal panel is a magnetic steel block;
the Hall element is fixed on a bottom plate of the motor, and a Hall probe of the Hall element corresponds to the magnetic steel block so as to receive a magnetic signal generated by the magnetic steel block.
5. The motor rotation speed measuring device according to claim 1, wherein the single chip microcomputer comprises a first processing module; the first processing module is used for obtaining the time difference of the adjacent pulse signals and taking the reciprocal of the time difference as the rotating speed value.
6. The motor rotation speed measuring device according to claim 1, wherein the single chip microcomputer comprises a feedback control module; the feedback control module is used for sending a control signal to a control circuit according to the rotating speed value and a preset rotating speed value; the control circuit is used for controlling an electric signal on a main circuit where the motor is located according to the control signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922260172.3U CN211697851U (en) | 2019-12-17 | 2019-12-17 | Motor rotating speed measuring device |
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| CN201922260172.3U CN211697851U (en) | 2019-12-17 | 2019-12-17 | Motor rotating speed measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112881746A (en) * | 2020-12-29 | 2021-06-01 | 江柴发动机徐州有限公司 | High-precision rotating speed measuring device for generator set and working method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112881746A (en) * | 2020-12-29 | 2021-06-01 | 江柴发动机徐州有限公司 | High-precision rotating speed measuring device for generator set and working method |
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