CN112180358B - Method and system for judging running state of motor - Google Patents
Method and system for judging running state of motor Download PDFInfo
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- CN112180358B CN112180358B CN202010930523.1A CN202010930523A CN112180358B CN 112180358 B CN112180358 B CN 112180358B CN 202010930523 A CN202010930523 A CN 202010930523A CN 112180358 B CN112180358 B CN 112180358B
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/50—Systems of measurement based on relative movement of target
- G01S13/58—Velocity or trajectory determination systems; Sense-of-movement determination systems
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
The application relates to a method and a system for judging the running state of a motor, wherein the motor comprises a reflecting component arranged on a motor rotating shaft, and the method comprises the following steps: a, emitting electromagnetic waves to a reflecting component; step b, receiving the electromagnetic wave reflected by the reflecting component, and obtaining the phase difference delta phi between the incident wave and the reflected wave of the electromagnetic wave; and c, converting the current revolution number V of the rotating shaft of the motor according to the phase difference delta phi, and judging the running state of the motor according to the current revolution number V, wherein the running state of the motor comprises whether the current revolution number V of the motor reaches a preset stable range or not. The method and the system for judging the running state of the motor can solve the problem that the running state of the motor is difficult to monitor, particularly judge whether the current rotating speed of the motor is in a preset stable range or not, and effectively prevent safety accidents and economic losses caused by unstable running of the motor.
Description
Technical Field
The application belongs to the technical field of detection, and particularly relates to a method and a system for judging the running state of a motor.
Background
The motor is an important energy supply device in various production equipment, and the more the current revolution of the motor approaches to the preset revolution, the more stable the running state of the motor is, and the normal operation of the equipment is facilitated. The greater the difference between the current rotation number of the motor and the preset rotation number thereof, the more unstable the motor operation state, the greater the risk of safety risk and economic loss caused by the failure of the equipment due to the unstable motor operation state, so there is a need for a method and a system which can at least measure the current rotation number of the motor, judge the motor operation state according to the current rotation number of the motor, and especially, whether the current rotation number of the motor reaches the preset stable range, and judge whether the rotation number of the motor is normal or not in the operation state.
Disclosure of Invention
In order to solve all or part of the problems, the application aims to provide a method and a system for judging the running state of a motor, which are used for solving the problem that the running state of the motor is difficult to monitor, in particular judging whether the current rotating speed of the motor is in a preset stable range or not, and effectively preventing safety accidents and economic losses caused by unstable running of the motor.
According to a first aspect of the present application, there is provided a method of determining an operating state of an electric motor including a reflecting member provided on a motor shaft, the method comprising: a step of emitting electromagnetic waves toward the reflecting member; step b of receiving the electromagnetic wave reflected by the reflecting member and acquiring a phase difference ΔΦ between an incident wave and a reflected wave of the electromagnetic wave; and c, converting the current revolution number V of the rotating shaft of the motor according to the phase difference delta phi, and judging the running state of the motor according to the current revolution number V, wherein the running state of the motor comprises whether the current revolution number V of the motor reaches a preset stable range or not.
Further, the step c further includes judging whether the revolution number V reaches a preset stable range, and controlling the reminding device to carry out standard exceeding reminding when the revolution number V does not reach the preset stable range.
Further, in step c, when the current rotation number V is greater than a preset value of 100.7% or less than a preset value of 99.3%, the reminding device is controlled to perform the first reminding, and when the current rotation number V is greater than a preset value of 106.7% or less than a preset value of 99.3%, the reminding device is controlled to perform the second reminding.
Further, the reminding device is a loudspeaker, a lamp or a display screen.
Further, in the step b, the rotation number V of the rotation shaft of the motor is obtained according to the following expression:
wherein lambda is the wavelength of the electromagnetic wave and the unit is mm;
delta phi is the phase difference in rad;
T c the unit is s for the period of the electromagnetic wave;
d is the vertical distance from the center point of the reflecting surface of the reflecting component to the central axis of the rotating shaft of the motor, and the unit is m.
Further, the electromagnetic wave is millimeter electromagnetic wave, the frequency of the millimeter electromagnetic wave is 30-300GHz, the wavelength is 1-10mm, and the distance between the radar device for emitting the electromagnetic wave and the rotating shaft is 1-10m.
Further, the distance between the radar device and the rotating shaft is 3-5m.
According to a second aspect of the present application, there is provided a system for determining an operating state of an electric machine, comprising: a reflecting member provided on a rotating shaft of the motor; a radar device capable of transmitting an electromagnetic wave to the reflection member and receiving the electromagnetic wave reflected by the reflection member to obtain a phase difference ΔΦ between an incident wave and a reflected wave of the electromagnetic wave; the control device is connected with the radar device, and can convert the current revolution number V of the rotating shaft of the motor according to the phase difference delta phi, and judge the running state of the motor according to the revolution number V, wherein the running state of the motor comprises whether the current revolution number V of the motor reaches a preset stable range or not.
Further, the reflecting component comprises a rod body and an electromagnetic wave reflecting piece, one end of the rod body is arranged on the rotating shaft of the motor along the radial direction, the other end of the rod body is used for installing the electromagnetic wave reflecting piece, and the central point of the reflecting surface is the central point of the electromagnetic wave reflecting piece.
Further, the system further comprises a reminding device for carrying out standard exceeding reminding after the current revolution number V does not reach a preset stable range.
As can be seen from the above technical solutions, the method and system for determining an operating state of a motor according to the present application mainly transmit electromagnetic waves to a reflective member disposed on a motor shaft through a radar device and receive reflected waves of the electromagnetic waves, so as to obtain a phase difference ΔΦ between an incident wave of the electromagnetic waves and the reflected waves, and calculate a current rotation number V of the motor shaft by testing the phase difference ΔΦ between the electromagnetic waves and the reflected waves of the electromagnetic waves. When the measured current rotation number V reaches the preset stable range, the control device can determine that the current motor operation state is stable based on the result. When the measured current revolution number V does not reach within the preset stable range, the control device can judge that the operation state of the motor is unstable based on the result. Therefore, the method and the system for judging the running state of the motor can solve the problem that the running state of the motor is difficult to monitor, particularly judge whether the current rotating speed of the motor is in the preset stable range or not, and effectively prevent safety accidents and economic losses caused by unstable running of the motor.
Drawings
Preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the figure:
FIG. 1 is a flow chart of a method of determining an operating state of a motor according to an embodiment of the present application;
fig. 2 is a functional block diagram of a system for determining an operation state of a motor according to an embodiment of the present application.
In the drawings, like parts are designated with like reference numerals. The figures are not drawn to scale.
Detailed Description
The application will be further described with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method of determining an operating state of a motor according to an embodiment of the present application. The method for judging the running state of the motor comprises the steps a, b and c. Step a is to emit electromagnetic waves to the reflecting member 102. Step b is: the electromagnetic wave reflected by the reflecting member 102 is received, and the phase difference ΔΦ between the incident wave and the reflected wave of the electromagnetic wave is acquired. Step c is: the method comprises the steps of converting the current rotation number V of a rotating shaft of a motor according to the phase difference delta phi, and judging the running state of the motor according to the current rotation number V, wherein the running state of the motor comprises whether the current rotation number V of the motor reaches a preset stable range or not. Optionally, when the reflected wave is received, the received reflected wave is filtered by means of CFAR algorithm, and then the phase difference ΔΦ is calculated by using the filtered reflected wave.
The method and system for judging the running state of the motor according to the embodiments of the present application mainly transmit electromagnetic waves to the reflecting member 102 provided on the rotating shaft of the motor through the radar device 101 and receive reflected waves of the electromagnetic waves to obtain a phase difference ΔΦ between the incident waves and the reflected waves of the electromagnetic waves, and calculate the current rotation number V of the rotating shaft of the motor by testing the phase difference ΔΦ between the electromagnetic waves and the reflected waves of the electromagnetic waves. When the measured current rotation number V reaches the preset stable range, the control device 103 can determine that the operation state of the current motor is stable based on the result. When the measured current rotation number V does not reach within the preset stable range, the control device 103 can determine that the operation state of the motor is unstable based on the result. The method and the system for judging the running state of the motor can solve the problem that the running state of the motor is difficult to monitor, particularly judge whether the current rotating speed of the motor is in a preset stable range or not, and effectively prevent safety accidents and economic losses caused by unstable running of the motor.
In this embodiment, the system 10 for determining the running state of the motor may further include a reminding device 104 for performing an out-of-standard reminding after the current number of revolutions V does not reach the preset stable range, so as to timely remind when the current number of revolutions V does not reach the preset stable range. The reminding device 104 may be a speaker, a lamp, a display screen, or the like. When the reminder 104 is selected as a loudspeaker, the loudspeaker is capable of emitting a designated sound under the control of the control 103, for example, representing that the current speed is insufficient as a continuous "beep" sound and that the current speed is too fast as a continuous "beep" sound. When the reminding device 104 is selected as a lamp, the reminding device can flash under the control of the control device 103, is used for reminding a tester that the current rotating speed is insufficient, and continuously emits light under the control of the control device 103, and is used for reminding the tester that the current rotating speed is too high. When the reminding device 104 is selected as a display screen, it can display specified information under the control of the control device 103, for example, display "insufficient rotation speed" to remind the tester of insufficient current rotation speed, and display "too fast rotation speed" to remind the tester of too fast current rotation speed.
In this embodiment, step c further includes determining whether the number of revolutions V reaches a preset stable range, and controlling the reminding device 104 to perform out-of-standard reminding when the number of revolutions V does not reach the preset stable range, so that the abnormal running state of the motor can be timely known. When the current revolution number V is greater than 100.7% of a preset value or less than 99.3% of a preset value, the reminding device 104 is controlled to carry out first reminding, and when the current revolution number V is greater than 106.7% of a preset value or less than 99.3% of a preset value, the reminding device 104 is controlled to carry out second reminding.
In the present embodiment, the rotation number V of the rotation shaft of the motor is obtained according to the following expression in step b:
wherein lambda is the wavelength of electromagnetic waves and the unit is mm;
delta phi is the phase difference between the incident wave and the reflected wave of the electromagnetic wave, and the unit is rad;
T c the unit is s, which is the period of electromagnetic wave;
d is the vertical distance from the center point of the reflecting surface of the reflecting component to the central axis of the rotating shaft of the motor, and the unit is m.
In this embodiment, the electromagnetic wave is preferably a millimeter electromagnetic wave with few interference sources, stable and reliable propagation and strong detection capability. The frequency of the millimeter electromagnetic wave is 30-300GHz, the wavelength is 1-10mm, and the distance between the radar device 101 emitting the electromagnetic wave and the rotating shaft is optionally 1-10m, preferably 3-5m.
Fig. 2 is a functional block diagram of a system for determining an operation state of a motor according to an embodiment of the present application. As shown in fig. 2, the system 10 for judging an operation state of a motor according to an embodiment of the present application includes a reflecting member 102, a radar device 101, and a control device 103. The radar apparatus 101 can emit electromagnetic waves to a reflection member 102 provided on a rotation shaft of a motor, and receive the electromagnetic waves reflected by the reflection member 102 to obtain a phase difference ΔΦ between an incident wave and a reflected wave of the electromagnetic waves. The control device 103 is connected with the radar device 101, and can convert the current rotation number V of the rotating shaft of the motor according to the phase difference ΔΦ, and then judge the running state of the motor according to the current rotation number V, wherein the running state of the motor comprises whether the current rotation number V of the motor reaches a preset stable range. Wherein the control device 103 comprises a programmable logic control unit (e.g., a PLC or a CPU), a memory, and electronic components coupled to the programmable logic control unit, etc., are well known to those skilled in the art and will not be described in detail herein.
In the present embodiment, the reflecting member 102 includes a rod body and an electromagnetic wave reflecting member. One end of the rod body is arranged on the rotating shaft of the motor along the radial direction, the other end of the rod body is used for installing an electromagnetic wave reflecting piece, and the central point of the reflecting surface is the central point of the electromagnetic wave reflecting piece. Wherein the electromagnetic wave reflecting member may be selected from a sheet body which is capable of reflecting electromagnetic waves and is made of silver, copper or aluminum.
In summary, the method and the system for judging the running state of the motor according to the embodiments of the present application are used for judging whether the current rotation speed of the motor is within the preset stable range, so as to solve the problem that the running state of the motor is difficult to monitor, and help to prevent the safety risk and the economic loss caused by the unstable running state of the motor.
In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "radial", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description and simplification of the description, and are not indicative or implying that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. In the description of the present application, the meaning of "plurality" is two or more unless specifically defined otherwise.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
The above description is merely a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily make modifications or variations within the technical scope of the present application disclosed herein, and such modifications or variations are intended to be included in the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims. The technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.
Claims (9)
1. A method of determining an operating condition of an electric machine, the electric machine including a reflective member disposed on a motor shaft, the method comprising:
a step of emitting electromagnetic waves toward the reflecting member;
step b of receiving the electromagnetic wave reflected by the reflecting member and acquiring a phase difference ΔΦ between an incident wave and a reflected wave of the electromagnetic wave;
in step b, the number of revolutions V of the shaft of the motor is determined according to the following equation:
wherein lambda is the wavelength of the electromagnetic wave and the unit is mm;
delta phi is the phase difference in rad;
T c the unit is s for the period of the electromagnetic wave;
d is the vertical distance from the center point of the reflecting surface of the reflecting component to the central axis of the rotating shaft of the motor, and the unit is m;
and c, converting the current revolution number V of the rotating shaft of the motor according to the phase difference delta phi, and judging the running state of the motor according to the current revolution number V, wherein the running state of the motor comprises whether the current revolution number V of the motor reaches a preset stable range or not.
2. The method according to claim 1, wherein the step c further comprises determining whether the number of revolutions V reaches a preset stable range, and controlling the reminding device to perform the out-of-standard reminding when the number of revolutions V does not reach the preset stable range.
3. The method according to claim 2, wherein in step c, the reminding device is controlled to perform a first reminding when the current revolution V is greater than 100.7% times a preset value or less than 99.3% times a preset value, and the reminding device is controlled to perform a second reminding when the current revolution V is greater than 106.7% times or less than 99.3% times a preset value.
4. The method of claim 2, wherein the alert device is a speaker, a light, or a display screen.
5. The method according to any one of claims 1 to 4, wherein the electromagnetic wave is a millimeter electromagnetic wave having a frequency of 30 to 300GHz and a wavelength of 1 to 10mm, and a distance between a radar device that emits the electromagnetic wave and the rotating shaft is 1 to 10m.
6. The method of claim 5, wherein a distance between the radar device and the shaft is 3-5m.
7. A system for determining the operating condition of an electric machine, comprising:
a reflecting member provided on a rotating shaft of the motor;
a radar device capable of transmitting an electromagnetic wave to the reflection member and receiving the electromagnetic wave reflected by the reflection member to obtain a phase difference ΔΦ between an incident wave and a reflected wave of the electromagnetic wave;
a control device connected to the radar device and capable of converting the current rotation number V of the rotating shaft of the motor according to the phase difference delta phi,
wherein lambda is the wavelength of the electromagnetic wave and the unit is mm;
delta phi is the phase difference in rad;
T c the unit is s for the period of the electromagnetic wave;
d is the vertical distance from the center point of the reflecting surface of the reflecting component to the central axis of the rotating shaft of the motor, and the unit is m;
and judging the running state of the motor according to the revolution number V, wherein the running state of the motor comprises whether the current revolution number V of the motor reaches a preset stable range or not.
8. The system of claim 7, wherein the reflecting member comprises a rod body and an electromagnetic wave reflecting member, one end of the rod body is disposed on a rotating shaft of the motor in a radial direction, the other end is used for mounting the electromagnetic wave reflecting member, and the reflecting surface center point is a center point of the electromagnetic wave reflecting member.
9. The system according to claim 8, comprising reminding means for carrying out an out-of-standard reminder after the current revolution V has not reached a preset stable range.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010930523.1A CN112180358B (en) | 2020-09-07 | 2020-09-07 | Method and system for judging running state of motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010930523.1A CN112180358B (en) | 2020-09-07 | 2020-09-07 | Method and system for judging running state of motor |
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| CN112180358A CN112180358A (en) | 2021-01-05 |
| CN112180358B true CN112180358B (en) | 2023-11-14 |
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| CN1113320A (en) * | 1993-07-12 | 1995-12-13 | 株式会社东芝 | Apparatus for and method of measuring difference of phases |
| JPH08266701A (en) * | 1995-03-30 | 1996-10-15 | Hino Motors Ltd | Shot ball tracking display device |
| CN103743298A (en) * | 2014-01-06 | 2014-04-23 | 常华俊 | Projectile revolution extraction method based on continuous wave radar |
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| CN111025064A (en) * | 2019-12-20 | 2020-04-17 | 中国科学技术大学 | Method and system for realizing detection of working state of ball mill by non-contact speed measurement |
| CN111247443A (en) * | 2018-09-29 | 2020-06-05 | 深圳市大疆创新科技有限公司 | Motor state monitoring device and motor state monitoring method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2573288T3 (en) * | 2012-06-26 | 2016-06-07 | Vestas Wind Systems A/S | Vibration detection of wind turbine blades and radar calibration |
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2020
- 2020-09-07 CN CN202010930523.1A patent/CN112180358B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1113320A (en) * | 1993-07-12 | 1995-12-13 | 株式会社东芝 | Apparatus for and method of measuring difference of phases |
| JPH08266701A (en) * | 1995-03-30 | 1996-10-15 | Hino Motors Ltd | Shot ball tracking display device |
| CN103743298A (en) * | 2014-01-06 | 2014-04-23 | 常华俊 | Projectile revolution extraction method based on continuous wave radar |
| CN205786679U (en) * | 2016-05-31 | 2016-12-07 | 毛敏 | A kind of motor speed measurement device |
| CN206559265U (en) * | 2017-03-15 | 2017-10-13 | 北京凌宇智控科技有限公司 | A kind of motor speed regulation system and signal projector |
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