CN112345786B - Reluctance type fluted disc speed measurement system and rotating speed calculation method - Google Patents
Reluctance type fluted disc speed measurement system and rotating speed calculation method Download PDFInfo
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Abstract
The invention relates to a reluctance type fluted disc speed measuring system, which comprises: the device comprises a gear disc, a rotating speed measuring module, a signal preprocessing module, a data storage unit and a data processing module; the gear disc is arranged on the rotating body, the rotating speed measuring module is connected with the signal preprocessing module, the signal preprocessing module is connected with the data storage unit, the data storage unit is connected with the data processing module, and the data processing module is connected with the display. The beneficial effects of the invention are as follows: according to the reluctance type fluted disc speed measuring system provided by the invention, only one multi-fluted disc is arranged, and the reference teeth coated with the non-magnetic material are arranged on the multi-fluted disc, so that unbalance of the rotor caused by the arrangement of a single fluted disc can be avoided; the system is also provided with a double-reluctance type sensor, so that the calculation error of the interdental angle caused by the fluctuation of the rotating speed can be reduced; the invention can reduce the error caused by uneven distribution of the fluted disc teeth.
Description
Technical Field
The invention belongs to the technical field of rotation speed measurement, and particularly relates to a reluctance type fluted disc speed measurement system.
Background
The magnetic resistance sensor has the advantages of quick response, good anti-interference capability, strong environmental adaptability and the like, so that the magnetic resistance sensor is widely applied to the fields of medium and high speed rotation speed measurement. Currently, a plurality of large-scale rotating machines such as steam turbines, water turbines and automobile engine rotors adopt a reluctance fluted disc speed measuring device to measure the rotating speed.
When the rotation speed is measured, the rotation speed of the rotor is calculated according to the time interval of sinusoidal signals generated when the fluted disc passes through the reluctance type sensor and the tooth number of the fluted disc. However, due to the machining errors of the gear plate and the mounting errors of the gear plate on the rotor, the distances between the teeth on the gear plate are not equal, and even under the condition of constant rotation speed, the time intervals of signals generated by the teeth are not the same, so that great difficulty is brought to rotation speed measurement. At present, a method of taking signals of a plurality of teeth and calculating an average time interval is adopted to reduce errors caused by uneven distribution of fluted disc teeth, but the rotating speed obtained by the method is an average rotating speed in a longer period of time, and the measuring precision and the response speed of the rotating speed are reduced. Therefore, how to improve the magnetoresistive fluted disc speed measurement system and the rotational speed calculation method has become a problem to be solved in the art.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a reluctance type fluted disc speed measuring system and a rotating speed calculating method.
This kind of magnetic resistance fluted disc speed measurement system includes: the device comprises a gear disc, a rotating speed measuring module, a signal preprocessing module, a data storage unit and a data processing module; the gear disc is arranged on the rotating body, the rotating speed measuring module is connected with the signal preprocessing module, the signal preprocessing module is connected with the data storage unit, the data storage unit is connected with the data processing module, and the data processing module is connected with the display; the rotating speed measuring module comprises a first magneto-resistance sensor and a second magneto-resistance sensor; the first magnetic resistance sensor is arranged on one side of the gear disc, the second magnetic resistance sensor is arranged on the other side of the gear disc, the first magnetic resistance sensor and the second magnetic resistance sensor are 180 degrees (coplanar) along the circumferential direction of the gear disc, and a reference tooth is arranged on the gear disc; the signal preprocessing module comprises a signal amplifying unit and a signal filtering unit; the data processing module comprises a data separation unit, a waveform comparison unit, an interdental angle calculation unit and a rotating speed output unit; the magneto-resistive sensor I and the magneto-resistive sensor II are both connected with the input end of the signal amplifying unit, the output end of the signal amplifying unit is connected with the input end of the signal filtering unit, the output end of the signal filtering unit is connected with the data storage unit, and the data storage unit is also connected with the data processing module.
Preferably, the gear plate is a toothed plate with a plurality of teeth, and each tooth is uniformly distributed along the circumferential direction of the toothed plate.
Preferably, the reference tooth surface is coated with a non-magnetic coating.
The rotating speed calculating method of the reluctance type fluted disc speed measuring system comprises the following steps:
step 1, initializing: before the rotation speed measurement starts, initializing a reluctance type fluted disc speed measurement system, and carrying out zero clearing (rotation speed zero clearing and interdental angle zero clearing) on data in a data storage unit;
step 2, signal acquisition and pretreatment: after the first magnetic resistance sensor and the second magnetic resistance sensor collect sinusoidal signals, the signal amplifying unit amplifies the collected sinusoidal signals, the signal filtering unit filters the amplified sinusoidal signals for a high time, and finally the preprocessed signals are stored in the data storage unit;
step 3, signal grouping: the data processing module reads the sine signal in the signal storage unit; the method comprises the steps of taking a sinusoidal signal peak value generated when a reference tooth passes through a magneto-resistive sensor as a separation point, and separating a signal of the magneto-resistive sensor I; numbering the separated signals in time sequence (1-1, 1-2, 1-3, 1-4 …); the sinusoidal signal peak value generated when the reference tooth passes through the magneto-resistive sensor II is used as a separation point to separate the signals of the magneto-resistive sensor II; numbering the separated signals in time sequence (2-1, 2-2, 2-3, 2-4 …);
step 4, signal screening, namely comparing waveforms of signals of two adjacent groups of magneto-resistive sensors through a waveform comparison unit;
step 5, signal checking: checking the accuracy of two groups of signals with minimum waveform distance in the first magneto-resistive sensor according to two groups of signals generated by the second magneto-resistive sensor at the same time, calculating the waveform distance of the kth group and the kth+1th group of signals generated by the second magneto-resistive sensor due to rotation speed fluctuation, and marking the calculation result as D 2-k Comparison D 2-k And D 1-k Wherein D is the size of 1-k To verify the minimum value of the distance between the first n groups of adjacent signal waveforms in the magnetoresistive sensor I; if D 2-k ＜2D 1-k Checking to be qualified; otherwise, continuing to execute the steps 4 to 5 until the verification is qualified;
step 6, calculating the interdental angle according to the qualified signals: selecting a first group of signals in two groups of magneto-resistive sensors with qualified verification, and recording the time interval between peak points of the signals as t k1 、t k2 ……t km The tooth space angle of the reference tooth and the adjacent tooth (reverse in the direction of rotation) is calculated:
the tooth space angle of each adjacent tooth is calculated in turn according to the above direction of rotation and is denoted as j 1 、j 2 、j 3 ……j m Storing the calculated interdental angle into a data storage unit;
step 7, according to the time interval t of the interdental sinusoidal signal wave crest i Calculating the rotating speed by combining the calculation results of the adjacent tooth space angles in the step 6:
in the above, j i Is the tooth space angle, t, of the i-th group of adjacent teeth i Is the time interval between two sinusoidal signal peaks; the magnetoresistive sensor outputs a rotational speed value per tooth pass.
Preferably, the step 4 specifically includes the following steps:
step 4.1, comparing the waveforms of the first set of signals and the second set of signals, finding out peak points of all sine signals in the signals of the previous set (1-1 set) of magneto-resistive sensors, setting the gear plate to have m teeth, setting the gear plate to have m+1 peak points in total, calculating the time intervals between all adjacent peak points, and marking as t 1 、t 2 ……t m Finding peak points of all sine signals in the next group (1-2 groups) of magneto-resistive sensor signals, calculating time intervals between all adjacent peak points, and recording as T 1 、T 2 ……T m ；
Step 4.2, calculating the distance between the waveforms of the signals of the two adjacent groups of magneto-resistive sensors:
in the above, m is the number of teeth of the gear disk, t 1 、t 2 ……t m For the time interval between all adjacent peak points in a signal of a previous group of magneto-resistive sensors, T 1 、T 2 ……T m For the time interval between all adjacent peak points in the signal of the latter group of magnetoresistive sensors; d (D) i The distance between two adjacent signal waveforms of the magnetoresistive sensor with the number of i;
sequentially comparing waveforms of the first signals of the two adjacent groups of magneto-resistive sensors according to the number, and obtaining the distance between the waveforms of the first adjacent signals of the first n groups of magneto-resistive sensors after n times of comparison: d (D) 1-1 、D 1-2 ……D 1-n The method comprises the steps of carrying out a first treatment on the surface of the Comparison D 1-1 、D 1-2 ……D 1-n And find the minimum value of the size of the code (D) 1-k And screening to obtain two groups of signals of the magneto-resistive sensors with the minimum waveform distance in the adjacent signals.
Preferably, the signal amplifying unit in step 2 is configured to amplify the amplitude of the sinusoidal signal generated by the first magnetoresistive sensor and the second magnetoresistive sensor; the signal filtering unit is used for filtering higher harmonics in sinusoidal signals generated by the first magnetic resistance sensor and the second magnetic resistance sensor.
Preferably, the data storage unit in step 2 is configured to store amplified and filtered sinusoidal signals generated by the first magnetoresistive sensor and the second magnetoresistive sensor, where the sinusoidal signals are used to calculate interdental angles between teeth on the gear disk; the data storage unit is also used for storing the calculated interdental angle, and the interdental angle is read by the rotating speed calculation unit and used for rotating speed calculation.
Preferably, the waveform comparing unit in step 4 is configured to compare waveforms of signals of the magnetoresistive sensor during two adjacent periods, and to screen out two adjacent signals that are least affected by the fluctuation of the rotational speed.
The beneficial effects of the invention are as follows: according to the reluctance type fluted disc speed measuring system provided by the invention, only one multi-tooth disc is arranged, and the relation between a sinusoidal signal and each tooth is determined through the reference tooth coated with the non-magnetic material on the multi-tooth disc, so that rotor unbalance caused by the arrangement of a single tooth disc can be avoided; the system is also provided with double-reluctance type sensor signal screening and checking, so that the interdental angle calculation error caused by rotation speed fluctuation can be reduced; the invention can calculate the rotating speed according to the time interval that each tooth passes through the magnetic resistance sensor, and can obviously improve the accuracy and response speed of the rotating speed measurement while reducing errors caused by uneven distribution of the fluted disc teeth.
Drawings
FIG. 1 is an assembly schematic diagram of a magnetoresistive fluted disc speed measurement system;
FIG. 2 is a left side view of a rotator, gear plate and magnetoresistive sensor of the magnetoresistive gear plate velocimetry system;
FIG. 3 is a top view of a rotator, gear plate and magnetoresistive sensor of the magnetoresistive gear plate velocimetry system;
FIG. 4 is a flow chart of a rotational speed calculation;
fig. 5 is a graph showing comparison of signal waveforms of adjacent two periods.
Reference numerals illustrate: the device comprises a rotating body 01, a gear disc 02, a first magneto-resistance sensor 03, a second magneto-resistance sensor 04, a signal amplifying unit 05, a signal filtering unit 06, a data storage unit 07, a data separation unit 08, a waveform comparison unit 09, an interdental angle calculation unit 10, a rotating speed calculation unit 11, a display 12 and a reference tooth 13.
Detailed Description
The invention is further described below with reference to examples. The following examples are presented only to aid in the understanding of the invention. It should be noted that it will be apparent to those skilled in the art that modifications can be made to the present invention without departing from the principles of the invention, and such modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Because the surface of the reference tooth 13 is coated with a non-magnetic coating, the amplitude of the sinusoidal signal generated when the first magnetic resistance sensor 03 and the second magnetic resistance sensor 04 pass through the reference tooth 13 is far smaller than that of the sinusoidal signal generated when the other teeth pass through;
the data separation unit 08 separates the sine signals generated by the first magneto-resistive sensor 03 according to the sine signals with low amplitude generated when the first magneto-resistive sensor 03 passes through the reference teeth, and each group of separated signals are signals generated by the first magneto-resistive sensor 03 when the gear disc 02 rotates for each circle; the data separation unit 08 separates the sinusoidal signal generated by the magneto-resistive sensor two 04 according to the sinusoidal signal with low amplitude generated when the magneto-resistive sensor two 04 passes through the reference tooth 13, and each group of separated signals is a signal generated by the magneto-resistive sensor two 04 in one period when the gear disc 02 rotates one turn;
the waveform comparing unit 09 is used for comparing the signal waveforms of the magnetoresistive sensor 03 in two adjacent periods and screening out two groups of adjacent signals least influenced by the fluctuation of the rotating speed. Then, according to two groups of signals generated by the second magneto-resistive sensor 04 at the same time, checking two groups of adjacent signals least influenced by rotation speed fluctuation, and selecting a first group of signals in the two groups of signals for interdental angle calculation after the checking is qualified; the interdental angle calculation unit 10 calculates the angle between each interdental according to the signal selected by the waveform comparison unit 09, and then stores the calculated interdental angle in the data storage unit 07; the rotational speed calculation unit 11 calculates the rotational speed of the rotor in real time based on the calculation result of the interdental angle and the time interval of the interdental sinusoidal signal, and outputs the calculation result through the display 12.
As an embodiment, as shown in fig. 1, a magneto-resistive fluted disc speed measurement system includes: the device comprises a gear disc 02, a rotating speed measuring module, a signal preprocessing module, a data storage unit 07 and a data processing module; the gear disc 02 is arranged on the rotating body 01, the rotating speed measuring module is connected with the signal preprocessing module, the signal preprocessing module is connected with the data storage unit 07, the data storage unit 07 is connected with the data processing module, and the data processing module is connected with the display 12; the rotation speed measuring module shown in fig. 2 and 3 comprises a first magneto-resistive sensor 03 and a second magneto-resistive sensor 04; the first magneto-resistance sensor 03 is arranged on one side of the gear disc 02, the second magneto-resistance sensor 04 is arranged on the other side of the gear disc 02, the first magneto-resistance sensor 03 and the second magneto-resistance sensor 04 are 180 degrees (coplanar) along the circumferential direction of the gear disc, and a reference tooth 13 (the surface of which is coated with a non-magnetic coating) is arranged on the gear disc 02; the signal preprocessing module comprises a signal amplifying unit 05 and a signal filtering unit 06; the data processing module comprises a data separation unit 08, a waveform comparison unit 09, an interdental angle calculation unit 10 and a rotating speed output unit 11; the magneto-resistive sensor I03 and the magneto-resistive sensor II 04 are both connected with the input end of the signal amplifying unit 05, the output end of the signal amplifying unit 05 is connected with the input end of the signal filtering unit 06, the output end of the signal filtering unit 06 is connected with the data storage unit 07, and the data storage unit 07 is also connected with the data processing module. As shown in fig. 3, the gear plate 02 has a plurality of toothed plates, each of which is uniformly distributed along the circumferential direction of the toothed plate.
As shown in fig. 4 and fig. 5, the rotational speed calculation method of the magnetoresistive fluted disc speed measurement system includes the following steps:
1) Initializing: before the rotation speed measurement starts, initializing a reluctance type fluted disc speed measurement system, and carrying out zero clearing (rotation speed zero clearing and interdental angle zero clearing) on data in a data storage unit 07;
2) Signal acquisition and pretreatment: after the magneto-resistive sensor one 03 and the magneto-resistive sensor two 04 collect sinusoidal signals, the signal amplifying unit 05 amplifies the collected sinusoidal signals, the signal filtering unit 06 filters the amplified sinusoidal signals for a high time, and finally the preprocessed signals are stored in the data storage unit 07;
3) Signal grouping: the data processing module reads the sinusoidal signal in the signal storage unit 07; the peak value of a sinusoidal signal generated when the reference tooth 13 passes through the first magneto-resistive sensor 03 is used as a separation point to separate the signals of the first magneto-resistive sensor 03; numbering the separated signals in time sequence (1-1, 1-2, 1-3, 1-4 …); the peak value of a sinusoidal signal generated when the reference tooth 13 passes through the magneto-resistive sensor II 04 is used as a separation point to separate the signals of the magneto-resistive sensor II 04; numbering the separated signals in time sequence (2-1, 2-2, 2-3, 2-4 …);
4) Signal screening, namely comparing waveforms of signals of two adjacent groups of magneto-resistive sensors 03 through a waveform comparison unit 09: comparing the waveforms of the first set of signals and the second set of signals, finding out peak points of all sine signals in the signals of the previous set (1-1 set) of magneto-resistive sensors 03, setting the gear plate 02 to have m teeth, and calculating the sum of m+1 peak points of the gear plate 02With time interval between adjacent peaks, and denoted t 1 、t 2 ……t m Finding peak points of all sine signals in the next group (1-2 groups) of magneto-resistive sensor-03 signals, calculating time intervals between all adjacent peak points, and recording as T 1 、T 2 ……T m The method comprises the steps of carrying out a first treatment on the surface of the Calculating the distance between the signal waveforms of the adjacent two groups of magneto-resistive sensors 03:
in the above description, m is the number of teeth of the gear disk 02, t 1 、t 2 ……t m For the time interval between all adjacent peak points in the previous set of magnetoresistive sensor-03 signals, T 1 、T 2 ……T m For the time interval between all adjacent peak points in the next set of magnetoresistive sensor-03 signals; d (D) i The distance between two adjacent groups of signal waveforms of the magnetoresistive sensor 03 with the number of i; the waveforms of the first 03 signals of the two adjacent groups of magneto-resistive sensors are sequentially compared according to the number, and the distances between the waveforms of the first n groups of adjacent signals are obtained after n times of comparison: d (D) 1-1 、D 1-2 ……D 1-n The method comprises the steps of carrying out a first treatment on the surface of the Comparison D 1-1 、D 1-2 ……D 1-n And find the minimum value of the size of the code (D) 1-k And screening to obtain two groups of magneto-resistive sensor signals 03 with minimum waveform distance in the adjacent signals.
5) And (3) signal verification: checking the accuracy of two groups of signals with minimum waveform distance in the first magneto-resistive sensor 03 according to two groups of signals generated by the second magneto-resistive sensor 04 at the same time, calculating the waveform distance of the kth group and the kth+1th group of signals generated by the second magneto-resistive sensor 04 due to rotation speed fluctuation, and marking the calculation result as D 2-k Comparison D 2-k And D 1-k Wherein D is the size of 1-k To verify the minimum value of the distance between the first n groups of adjacent signal waveforms in the first magneto-resistive sensor 03; if D 2-k ＜2D 1-k Checking to be qualified; otherwise, continuing to execute the steps 4 to 5 until the verificationQualified;
6) Calculating the interdental angle according to the signal of the qualification check: selecting a first group of signals in two groups of magneto-resistive sensors 03 signals which are qualified in verification, and recording the time interval between peak points of the group of signals as t k1 、t k2 ……t km The tooth space angle of the reference tooth 13 and the adjacent tooth (reverse in the rotation direction) is calculated:
the tooth space angle of each adjacent tooth is calculated in turn according to the above direction of rotation and is denoted as j 1 、j 2 、j 3 ……j m The method comprises the steps of carrying out a first treatment on the surface of the Storing the calculated interdental angle in a data storage unit 07;
7) According to the time interval t of the interdental sinusoidal signal peaks i And (3) calculating the rotating speed by combining the calculation results of the adjacent tooth space angles in the step (6):
in the above, j i Is the tooth space angle, t, of the i-th group of adjacent teeth i Is the time interval between two sinusoidal signal peaks; the magnetoresistive sensor 03 outputs a rotational speed value every time it passes a tooth.
Claims (6)
1. A magneto-resistive fluted disc speed measurement system, comprising: the device comprises a gear disc (02), a rotating speed measuring module, a signal preprocessing module, a data storage unit (07) and a data processing module; the gear disc (02) is arranged on the rotating body (01), the rotating speed measuring module is connected with the signal preprocessing module, the signal preprocessing module is connected with the data storage unit (07), the data storage unit (07) is connected with the data processing module, and the data processing module is connected with the display (12);
the rotating speed measuring module comprises a first magnetic resistance sensor (03) and a second magnetic resistance sensor (04); the first magneto-resistance sensor (03) is arranged on one side of the gear disc (02), the second magneto-resistance sensor (04) is arranged on the other side of the gear disc (02), the first magneto-resistance sensor (03) and the second magneto-resistance sensor (04) are 180 degrees along the circumferential direction of the gear disc, reference teeth (13) are arranged on the gear disc (02), and a non-magnetic coating is coated on the surfaces of the reference teeth (13); the signal preprocessing module comprises a signal amplifying unit (05) and a signal filtering unit (06); the data processing module comprises a data separation unit (08), a waveform comparison unit (09), an interdental angle calculation unit (10) and a rotating speed output unit (11); the magneto-resistive sensor I (03) and the magneto-resistive sensor II (04) are both connected with the input end of the signal amplifying unit (05), the output end of the signal amplifying unit (05) is connected with the input end of the signal filtering unit (06), the output end of the signal filtering unit (06) is connected with the data storage unit (07), and the data storage unit (07) is also connected with the data processing module.
2. The reluctance type fluted disc speed measurement system according to claim 1, wherein: the gear plate (02) is a fluted disc with a plurality of teeth, and each tooth is uniformly distributed along the circumferential direction of the fluted disc.
3. A method of calculating the rotational speed of a magneto-resistive fluted disc speed measurement system according to claim 1, comprising the steps of:
step 1, initializing: before the rotation speed measurement starts, initializing a reluctance type fluted disc speed measurement system, and resetting data in a data storage unit (07);
step 2, signal acquisition and pretreatment: after the first magneto-resistance sensor (03) and the second magneto-resistance sensor (04) acquire sinusoidal signals, a signal amplifying unit (05) amplifies the acquired sinusoidal signals, a signal filtering unit (06) filters the amplified sinusoidal signals for a high time, and finally the preprocessed signals are stored in a data storage unit (07);
step 3, signal grouping: the data processing module reads the sine signal in the data storage unit (07); dividing the signal of the first magneto-resistive sensor (03) by taking a sinusoidal signal peak value generated when the reference tooth (13) passes through the first magneto-resistive sensor (03) as a dividing point; numbering the separated signals in time sequence; the sinusoidal signal peak value generated when the reference tooth (13) passes through the magneto-resistive sensor II (04) is used as a separation point to separate the signals of the magneto-resistive sensor II (04); numbering the separated signals in time sequence;
step 4, signal screening, wherein waveforms of signals of two adjacent groups of magneto-resistive sensors one (03) are compared through a waveform comparison unit (09); the step 4 specifically comprises the following steps:
step 4.1, finding out peak points of all sine signals in the previous group of magneto-resistive sensor one (03) signals, setting the gear disc (02) to have m teeth, setting the gear disc (02) to have m+1 peak points, calculating time intervals between all adjacent peak points, and recording as t 1 、t 2 ……t m Finding peak points of all sine signals in the next group of magneto-resistive sensor one (03) signals, calculating time intervals between all adjacent peak points, and recording as T 1 、T 2 ……T m ；
Step 4.2, calculating the distance between the signal waveforms of the adjacent two groups of magneto-resistive sensors one (03):
in the above formula, m is the number of teeth of the gear disk (02), t 1 、t 2 ……t m For the time interval between all adjacent peak points in the previous set of magnetoresistive sensor-signals (03), T 1 、T 2 ……T m For the time interval between all adjacent peak points in the latter set of magnetoresistive sensor one (03) signals; d (D) i The distance between two adjacent sets of signal waveforms of magnetoresistive sensor one (03) numbered i;
the waveforms of the signals of the adjacent two groups of magneto-resistive sensors I (03) are sequentially compared according to the number, and the distances between the waveforms of the adjacent signals of the first n groups of magneto-resistive sensors I (03) are obtained after n times of comparison: d (D) 1-1 、D 1-2 ……D 1-n The method comprises the steps of carrying out a first treatment on the surface of the Comparison D 1-1 、D 1-2 ……D 1-n And find the minimum value of the size of the code (D) 1-k Screening to obtain two groups of magneto-resistive sensors with minimum waveform distance in adjacent signals(03) A signal;
step 5, signal checking: checking the accuracy of two groups of signals with minimum waveform distance in the first magneto-resistive sensor (03) according to two groups of signals generated by the second magneto-resistive sensor (04) at the same time, calculating the waveform distance of the kth group and the kth+1th group of signals generated by the second magneto-resistive sensor (04) due to rotation speed fluctuation, and marking the calculation result as D 2-k Comparison D 2-k And D 1-k Wherein D is the size of 1-k To verify the minimum value of the distance between the first n groups of adjacent signal waveforms in the first magneto-resistive sensor (03); if D 2-k ＜2D 1-k Checking to be qualified; otherwise, continuing to execute the steps 4 to 5 until the verification is qualified;
step 6, calculating the interdental angle according to the qualified signals: selecting a first group of signals in two groups of magneto-resistive sensor signals (03) which are qualified in verification, and recording the time interval between peak points of the group of signals as t k1 、t k2 ……t km Calculating the tooth space angle of the reference tooth (13) and the adjacent tooth:
the tooth space angle of each adjacent tooth is calculated in turn according to the above direction of rotation and is denoted as j 1 、j 2 、j 3 ……j m, Storing the calculated interdental angle in a data storage unit (07);
step 7, according to the time interval t of the interdental sinusoidal signal wave crest i Calculating the rotating speed by combining the calculation results of the adjacent tooth space angles in the step 6:
in the above, j i Is the tooth space angle, t, of the i-th group of adjacent teeth i Is the time interval between two sinusoidal signal peaks; the magnetoresistive sensor one (03) outputs a rotational speed value per tooth.
4. A method for calculating a rotational speed of a magneto-resistive fluted disc speed measurement system according to claim 3, wherein: the signal amplification unit (05) in the step 2 is used for amplifying the amplitude of sinusoidal signals generated by the first magneto-resistive sensor (03) and the second magneto-resistive sensor (04); the signal filtering unit (06) is used for filtering higher harmonics in sinusoidal signals generated by the first magneto-resistive sensor (03) and the second magneto-resistive sensor (04).
5. A method for calculating a rotational speed of a magneto-resistive fluted disc speed measurement system according to claim 3, wherein: the data storage unit (07) in the step 2 is used for storing amplified and filtered sinusoidal signals generated by the first magneto-resistive sensor (03) and the second magneto-resistive sensor (04); the data storage unit (07) is also used for storing the calculated interdental angle.
6. A method for calculating a rotational speed of a magneto-resistive fluted disc speed measurement system according to claim 3, wherein: in the step 4, the waveform comparing unit (09) is used for comparing the signal waveforms of the first magneto-resistive sensor (03) in two adjacent periods and screening out two groups of adjacent signals least influenced by the fluctuation of the rotating speed.
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|---|---|---|---|---|
| CN103217545B (en) * | 2013-03-26 | 2015-07-08 | 南京南瑞继保电气有限公司 | Method for judging fault tolerance and abnormality of rotating speed signal of synchronous motor |
| CN105547130B (en) * | 2016-01-18 | 2018-07-27 | 刘文奇 | A kind of ABS gear rings pitch error detection method and its device |
| CN110146719A (en) * | 2019-06-10 | 2019-08-20 | 陈许辉 | A kind of fluted disc speed measuring system and Speed Measurement Method of Fluted Disc |
| CN111735983A (en) * | 2020-06-28 | 2020-10-02 | 西北工业大学 | System and method for acquiring wheel speed of airplane anti-skid brake based on magnetic resistance induction |
| CN111766396B (en) * | 2020-07-13 | 2022-03-22 | 贵州电网有限责任公司 | Device and method for measuring time constant of rotating speed probe and preamplifier |
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2020
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