CN201007719Y - Giant magnetic sensor and giant magnetic sensor speedometer - Google Patents
Giant magnetic sensor and giant magnetic sensor speedometer Download PDFInfo
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- CN201007719Y CN201007719Y CNU2007200785341U CN200720078534U CN201007719Y CN 201007719 Y CN201007719 Y CN 201007719Y CN U2007200785341 U CNU2007200785341 U CN U2007200785341U CN 200720078534 U CN200720078534 U CN 200720078534U CN 201007719 Y CN201007719 Y CN 201007719Y
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Abstract
Disclosed is a velocity measuring mechanism of a giant magnetic sensor comprising a giant magnetic sensor, a magnetic drum and a circuit module of microprocessor. A base plate of the giant magnetic sensor is fixed with 4 or 6 groups of giant magnetic resistances. Each group of the giant magnetic resistances is provided with 4-24 giant magnetic resistances. Ends of each group of giant magnetic resistances of front half portion and the rear half portion are interconnected as input ends, and groups of the front half portion are sequentially interconnected with the other ends of each group of giant magnetic resistances of the rear half portion as an output end. A rotary shaft of the magnetic drum is connected with objects ready for testing via actuation. The giant magnetic sensor is fixed to one side of the magnetic drum in a distance of 0.05-0.15 millimeter and is accessed to the circuit module of microprocessor by an amplifying circuit. The magnetic drum and the objects ready for testing are in synchronous rotation and circumferential magnetic field of the magnetic drum and the objects ready for testing are alternated. Resistance value of the giant magnetic sensor then varies with the alternating circumferential magnetic field. Consequently speed of a rotating motion-body can be achieved after loading signals into the microprocessor. The microprocessor automatically selects a sifting magnification according to frequency of signals and can adapt for different speed testing of 1-5000 rotation/ minute, and the resolution ratio is higher than a radian of 3.6*<10>-5. The utility model has strong anti-jamming capability, high impact strength and capability of working normally in hostile environment.
Description
(1) technical field
The utility model relates to the velocity measuring technique field, is specially a kind of huge Magnetic Sensor, and the contactless velocity measurement mechanisms that rotatablely moves that uses the huge Magnetic Sensor of this kind to make.
(2) technical background
Giant magnetoresistance (Giant Magneto Resistive) abbreviates GMR as, it is the collection thin magnetic film, integrated and the nanometer technology of semiconductor is the new high-tech product of one, GMR electricresistance effect under the action of a magnetic field is big, and the amplitude that general giant magnetoresistance changes is than surplus the magnetic resistance numerical value high approximately ten of common magnetic metal and alloy material times.Therefore sensors such as the sensor made from GMR and photoelectricity are compared, have resolution height, good reliability, low speed Static Detection, response is fast, detect distance, bandwidth, power consumption is little, volume is little, can work in advantage such as rugged surroundings, attracted attention by the people, what come out has GMR current sensor, a GMR displacement transducer etc.If existing GMR displacement transducer is used for rotary speed measuring mechanism, its resolution is not high enough on the one hand, can not distinguish rotation direction in addition, Gu the suitable huge Magnetic Sensor that is exclusively used in rotary speed measuring mechanism is not arranged at present as yet.
In scientific research, activity in production, often need control and regulate the plant equipment running status, the velocity measurement mechanisms that just needs all kinds to rotatablely move for this reason, such as, tech-generator, grating encoder, mechanical drive pointer-type tachometer of measuring, magnetic-pulse or light pulse type measurement of rotating speed instrument, AMR magnetic encoder etc.It is contactless that these speed measuring devices have contact also to have, and its relative merits are respectively arranged.With regard to the most frequently used tech-generator, grating encoder, AMR magnetic encoder three comparatively speaking, tech-generator low speed, high speed characteristics are all bad.Grating encoder has overcome the shortcoming of tech-generator, but weatherability is poor, is subject to humidity, mildew spot, thereby influences precision.Anisotropic magnetoresistive AMR (Anisotropic MagnetoResistive) magnetic encoder can work in rugged surroundings, but blemish in an otherwise perfect thing is that the resolution of AMR magnetic encoder is not high, utilize at present the Magnetic Sensor of traditional AMR material in the world, its magnetic field resolution index is 40 microgasusses, so the magnetic pole of its magnetic drum must not be narrow, be that the magnetic pole logarithm can not be too many under the limited condition.Like this, just the umber of pulse not as grating encoder output is many for the AMR magnetic encoder under the same scale condition, and promptly precision is low than it.
The GMR material is bigger, highly sensitive than AMR material magnetoresistive ratio, adopts huge magnetic survey speed huge Magnetic Sensor, that satisfy that the abominable occasion of environmental baseline is used, high-accuracy high-resolution mechanism so the researchist is is just researching and developing at present.
(3) utility model content
The purpose of this utility model is a kind of huge Magnetic Sensor that is exclusively used in rotary speed measuring mechanism of design, its resolution height, and can distinguish rotation direction.
Another purpose of the present utility model is a kind of fast mechanism of huge magnetic survey that uses the huge Magnetic Sensor of the utility model design of design, is used for the rotational speed that on-line synchronous is followed the tracks of object to be detected.
The huge Magnetic Sensor of the utility model design comprises insulated substrate and giant magnetoresistance, secured in parallel N group giant magnetoresistance grizzly bar on base plan, N=4 or 6, every group of giant magnetoresistance that the long 3mm～5mm of n bar, wide 0.015mm～0.03mm are arranged, n is 4～24 integer, grizzly bar centre distance is 0.1mm～0.5mm, and the width of every group of grizzly bar is 2.5 mm～10.0mm.The resistance of each giant magnetoresistance is 500 Ω～1000 Ω.N is organized the giant magnetoresistance grizzly bar be divided into front and back two parts N
1And N
2, the 1st, 2 group is N in the time of 4 groups
1Partly, the 3rd, 4 group is N
2Part, the 1st, 2,3 group is N in the time of 6 groups
1Partly, the 4th, 5,6 group is N
2Part; N
1One end of each giant magnetoresistance grizzly bar of each group of part is coupled to each other, is the input end a of this sensor, N
2One end of each giant magnetoresistance grizzly bar of each group of part is coupled to each other, is the input end b of this sensor; N
1The part each the group successively with N
2After linking, the other end of each bar giant magnetoresistance grizzly bar of each group of part is the output terminal of sensor; That is N 4 groups time the,
1The part the 1st, 2 group respectively with N
2The other end of each giant magnetoresistance grizzly bar of the 3rd, 4 group of part links and is sensor output terminals A and output terminal B, N in the time of 6 groups
1The part the 1st, 2,3 group successively respectively with N
2The other end of each giant magnetoresistance grizzly bar of the 4th, 5,6 group of part links and is sensor output terminals A, B, C.
Sensor input termination direct supply, the voltage that output terminal output changes connects amplifying circuit.The huge Magnetic Sensor velocity measurement mechanisms of the utility model design, comprise huge Magnetic Sensor, magnetic drum, microcontroller circuit module, its huge Magnetic Sensor is above-mentioned huge Magnetic Sensor of the present utility model, and cylinder diameter is 28mm～35mm, radially staggered 800 pairs～1600 pairs magnetic poles that evenly distribute.The magnetic drum rotating shaft drives with the turning axle of object under test through the magnetic attraction shaft coupling and is connected, and the rotating machinery energy passes to magnetic drum by the magnetic attraction shaft joint.Huge Magnetic Sensor is fixed in magnetic drum one side, its giant magnetoresistance grizzly bar and magnetic drum parallel axes, and the distance on huge Magnetic Sensor and magnetic drum surface is 0.05mm～0.15mm.Huge Magnetic Sensor is connected with amplifying circuit, and amplifying circuit inserts the microcontroller circuit module.
The concrete steps of huge Magnetic Sensor velocity measurement mechanisms synchronous detection rotating speed of the present utility model are as follows:
(1) signal obtains, and during the object under test rotation, magnetic drum rotates synchronously, and the flux polarity in the magnetic field of magnetic drum periphery constantly alternates, and the huge magnetic magnetoelectricity resistance of respectively organizing that can responsively receive and pay out the huge Magnetic Sensor of superfine changes of magnetic field also changes thereupon; When the magnetic drum sense of rotation not simultaneously, the direction difference of changes of magnetic field, huge Magnetic Sensor respectively organize the phase sequence difference that giant magnetoresistance is subjected to the action of a magnetic field, can determine sense of rotation in view of the above.
(2) conversion of signals, giant magnetoresistance converts the flux change pulse signal that captures to electric impulse signal and sends into amplifying circuit, is shaped to square-wave pulse signal through amplification;
(3) signal Processing is transferred to the microcontroller circuit module with step (2) gained square-wave pulse signal, and signal is carried out exporting count pulse, positive-negative rotation state pulse and the pulse of segmentation multiple after the digitized processing; The microcontroller circuit module reaches as high as 8000 segmentations through the velocity variable of the body that can obtain after the Subdividing Processing to rotatablely move accurately; Have the health check-up that rotatablely moves of broad velocity variations to survey in order to adapt to, the microcontroller circuit module changes subdivided multiplying automatically according to the height of its output signal frequency.Promptly, output signal frequency allows output valve 20 * 10 when being higher than
6During Hz, change subdivided multiplying automatically, avoided descending, realized the rotatablely move rotation speed change of body of intelligent detection because of subdivided multiplying increases frequency response.
The advantage of the huge Magnetic Sensor of the utility model is the accuracy of detection height, and good reliability is particularly suitable for rotary speed measuring mechanism and uses, and can determine sense of rotation.
The advantage of the huge magnetic survey speed of the utility model mechanism is: 1, the microcontroller circuit module is selected subdivided multiplying automatically according to the height of signal frequency, can adapt to per minute only the speed that rotatablely moves of a Ultra-Low Speed that changes detect, the continually varying that can adapt to per minute 5000 again the changes high speed speed that rotatablely moves detects, and resolution is higher than 3.6 * 10
-5Radian has overcome traditional grating encoder and AMR magnetic grid scrambler and can't satisfy the problem that requires with high low speed moving object rotating speed accuracy of detection under the accuracy class; 2, antijamming capability strong, excellent in cushion effect, can be in operate as normal under the rugged surroundings; 3, volume is little, cost performance is high, Installation and Debugging are convenient, practical.
(4) description of drawings
Fig. 1 is the huge Magnetic Sensor example structure of a utility model synoptic diagram;
Fig. 2 is the circuit block diagram of the huge magnetic survey speed of the utility model mechanism for implementing example;
Fig. 3 is the structural representation of the huge magnetic survey speed of the utility model mechanism for implementing example.
Among the figure: 1. O-ring seal, 2. base, 3. magnetic drum rotating shaft, 4. fixed support, 5. huge Magnetic Sensor 6. magnification circuit plates, 7. shell, 8, the microcontroller circuit plate, 9. magnetic drum, 10.. socket, 11. magnetic suspension bearings, 12. magnetic attraction shaft couplings
(5) embodiment
The huge Magnetic Sensor embodiment of the utility model concrete structure as shown in Figure 1, comprise insulated substrate and giant magnetoresistance, 4 groups of giant magnetoresistance grizzly bars of secured in parallel on the base plan, every group has 4 long 5.000mm, wide 0.015mm, grizzly bar centre distance is the giant magnetoresistance of 0.125mm, every group of width is 0.39mm, and 4 groups overall width is 2.5mm.The resistance of each giant magnetoresistance is 500 Ω, and substrate is quartz glass or stupalith.1st, 2 groups of giant magnetoresistance grizzly bars are N
1Partly, the 3rd, 4 group is N
2Part, N
1One end of each giant magnetoresistance grizzly bar of the 1st, 2 group of part is coupled to each other, is the input end a of this sensor, N
2One end of each giant magnetoresistance grizzly bar of 3,4 groups of part is coupled to each other, is the input end b of this sensor; N
1The 1st group and N of part
2The other end of each giant magnetoresistance grizzly bar of the 3rd group of part links and is sensor output terminals A, N
1The 2nd group and N of part
2The other end of each giant magnetoresistance grizzly bar of the 4th group of part links and is sensor output terminal B.
The circuit structure of the huge magnetic survey speed of the utility model mechanism for implementing example as shown in Figure 2, comprise huge Magnetic Sensor, magnetic drum, microcontroller circuit module, the distance on huge Magnetic Sensor and magnetic drum surface is 0.1mm, the changes of magnetic field of induction rotary head drum, huge Magnetic Sensor connects amplifying circuit, and amplifying circuit inserts the microcontroller circuit module.Its huge Magnetic Sensor is above-mentioned huge Magnetic Sensor of the present utility model.Cylinder diameter is 32mm, 800 pairs of magnetic pole staggered evenly distributions on circumference.
The huge magnetic survey speed of the utility model mechanism is for ease of using, and each component groups is loaded in the shell 6, as shown in Figure 3.Setting-in magnetic suspension bearing 11 on the base 2, magnetic drum rotating shaft 3 vertically is installed on base 2 through magnetic suspension bearing 11, is supported by base 2, is in shell 6 intracavity bottoms, and magnetic suspension bearing 11 makes magnetic drum 8 high-speed motions and does not have friction.The magnetic attraction shaft coupling 12 of magnetic drum rotating shaft 3 bottoms through being positioned at base 2 bottoms drives with the turning axle of object under test and is connected.Install support 4 on the base 2, huge Magnetic Sensor 5 is fixed on the support 4, is positioned at magnetic drum 8 one sides, its giant magnetoresistance grizzly bar and magnetic drum 8 parallel axes, and huge Magnetic Sensor 5 is 0.1mm with the gap on magnetic drum 8 surfaces.The circuit board of amplifying circuit and huge Magnetic Sensor 5 mount and are integral, and amplification circuit output end inserts the microcontroller circuit module input, and microcontroller circuit module board 7 is fixed in shell 6 inner chambers, magnetic drum 8 tops.The microcontroller circuit module contains voltage-controlled phase-locked loop circuit.When being higher than, the output signal frequency of microprocessor allows output valve 20 * 10
6During Hz, microprocessor transmits a signal to voltage-controlled phase-locked loop circuit, changes subdivided multiplying automatically, keeps output signal frequency to be lower than 20 * 10
6Hz.After the microcontroller circuit module is carried out signal Processing, output count pulse, positive-negative rotation state pulse and the pulse of segmentation multiple.Shell 6 covers on outside each assembly, and shell 6 bottoms are connected with base 2.Between shell 6 and the base 2 the straight cutting bayonet socket can be arranged, shell is inserted the two for 6 times and can be connected, and is easy to loading and unloading.The output terminal of microcontroller circuit module has connector 9 to connect accessory power outlet 10, and accessory power outlet 10 is fixed in shell 6 one sides, can draw output signal with the plug that matches.Accessory power outlet 9 is the aviation socket, is connected with the aviation plug that matches, and is reliable and stable to guarantee that plug and socket connects.
It is neodymium iron boron (NdFeB) material that described magnetic drum 8 magnetic are got involved medium, and residual magnetic flux density is 0.5 * 10
3To 50 * 10
3Gauss.The magnetic drum 8 counting pulse signal highest frequency that rotates a circle reaches 20 * 10
6Hz.
Described microcontroller circuit module can adopt CPLD, i.e. the CPLD module.
On the base 2 fixed orifice is arranged, this velocity measurement mechanisms can be fixedlyed connected with the housing end face of rotating object to be measured, base 2 bottom surfaces are embedded with O-ring seal 1, and base 2 is connected with the face seal of measured object shell ends, avoids the dust greasy dirt to enter in this velocity measurement mechanisms shell 6.
During use this velocity measurement mechanisms base 2 is connected with measured object housing end face, magnetic attraction shaft coupling 12 passes to magnetic drum rotating shaft 3 with the measured object mechanical energy, and magnetic drum 8 rotates synchronously with measured object.The changes of magnetic field pulse that Magnetic Sensor 5 obtains is sent into the microcontroller circuit module after amplifying circuit is handled, the highest 5V of the secondary value of output pulse signal voltage has the rotating pulse signal, and the magnetic drum 8 counting pulse signal highest frequency that rotates a circle reaches 20 * 10
6Hz.Microprocessor is followed the tracks of the measured object rotating speed and is selected subdivided multiplying automatically, can adapt to minimum speed 1 commentaries on classics/per minute, and the occasion that also adapts to 5000 commentaries on classics/per minutes is used, and resolution is higher than 3.6 * 10
-5Radian.This velocity measurement mechanisms is mainly used in realizes that rotating speed is measured accurately on the automatic production line, and matches with control gear.
Following table is depicted as the test the speed result of this velocity measurement mechanisms to different rotating speeds.
| Rotating speed (rev/min) | Resolution (second) as a result tests the speed | Average resolution rate value (second) | Error % | ||
| For the first time | For the first time | For the |
|||
| 1 | 1.67×10 -2 | 1.61×10 -2 | 1.65×10 -2 | 1.64×10 -2 | 1.23 |
| 10 | 1.62×10 -1 | 1.63×10 -1 | 1.61×10 -1 | 1.62×10 -1 | 0 |
| 200 | 1.62 | 1.61 | 1.63 | 1.62 | 0 |
| 1000 | 16.36 | 16.24 | 16.36 | 16.32 | 0.74 |
| 3000 | 16.16 | 16.12 | 16.24 | 16.17 | 0.19 |
| 5000 | 16.20 | 16.22 | 16.22 | 16.22 | 0.12 |
Show as seen thus, in slow-speed of revolution situation, when promptly rotating speed only was 1 rev/min, the average resolution rate of this velocity measurement mechanisms reached 1.64 * 10
-2Second, in high speed conditions, promptly during 5000 rev/mins of turn ups, the average resolution rate of this velocity measurement mechanisms reaches 16.22 seconds.The range of speeds that this velocity measurement mechanisms is suitable for is wide, is quick on the draw the precision height.
Claims (10)
1. a huge Magnetic Sensor comprises insulated substrate and giant magnetoresistance, it is characterized in that:
Secured in parallel N group giant magnetoresistance grizzly bar on the base plan, N=4 or 6, every group has the long 3mm～5mm of n bar, wide 0.015mm～0.03mm, grizzly bar centre distance is the giant magnetoresistance of 0.1mm～0.5mm, n is 4～24 integer, the width of every group of grizzly bar is 2.5mm～10.0mm, and the resistance of each giant magnetoresistance is 500 Ω～1000 Ω; Two parts N before and after N group giant magnetoresistance grizzly bar is divided into
1And N
2, N
1One end of each giant magnetoresistance grizzly bar of each group of part is coupled to each other, is the input end A of this sensor, N
2One end of each giant magnetoresistance grizzly bar of each group of part is coupled to each other, is the input end B of this sensor; N
1The part each the group successively with N
2After linking, the other end of each giant magnetoresistance grizzly bar of each group of part is the output terminal of sensor; Sensor input termination direct supply, the voltage that output terminal output changes.
2. the fast mechanism of huge magnetic survey comprises huge Magnetic Sensor, magnetic drum, microcontroller circuit module, it is characterized in that:
Described huge Magnetic Sensor is a secured in parallel N group giant magnetoresistance grizzly bar on the insulated substrate plane, N=4 or 6, every group has the long 3mm～5mm of n bar, wide 0.015mm～0.03mm, grizzly bar centre distance is the giant magnetoresistance of 0.1mm～0.5mm, n is 4～24 integer, the width of every group of grizzly bar is 2.5mm～10.0mm, and the resistance of each giant magnetoresistance is 500 Ω～1000 Ω; Two parts N before and after N group giant magnetoresistance grizzly bar is divided into
1And N
2, N
1One end of each giant magnetoresistance grizzly bar of each group of part is coupled to each other, is the input end a of this sensor, N
2One end of each giant magnetoresistance grizzly bar of each group of part is coupled to each other, is the input end b of this sensor; N
1The part each the group successively with N
2After linking, the other end of each giant magnetoresistance grizzly bar of each group of part is the output terminal of sensor; Sensor input termination direct supply, the voltage that output terminal output changes connects amplifying circuit;
Described cylinder diameter is 28mm～35mm, radially staggered 800 pairs～1600 pairs magnetic poles that evenly distribute; The magnetic drum rotating shaft drives with the turning axle of object under test through the magnetic attraction shaft coupling and is connected, and huge Magnetic Sensor is fixed in magnetic drum one side, its giant magnetoresistance grizzly bar and magnetic drum parallel axes, and the distance on huge Magnetic Sensor and magnetic drum surface is 0.05mm～0.15mm; Huge Magnetic Sensor is connected with amplifying circuit, and amplifying circuit inserts the microcontroller circuit module.
3. the fast mechanism of huge magnetic survey according to claim 2 is characterized in that:
Described microcontroller circuit module contains voltage-controlled phase-locked loop circuit, allows output valve 20 * 10 when the output signal frequency of microprocessor is higher than
6During Hz, microprocessor transmits a signal to voltage-controlled phase-locked loop circuit, changes subdivided multiplying automatically, keeps output signal frequency to be lower than 20 * 10
6Hz.
4. the fast mechanism of huge magnetic survey according to claim 2 is characterized in that:
Described huge Magnetic Sensor, amplifying circuit, magnetic drum, microcontroller circuit module are assembled in the shell (6), base (2) is gone up setting-in magnetic suspension bearing (11), magnetic drum rotating shaft (3) vertically is installed on base (2) through magnetic suspension bearing (11), support by base (2), be in shell (6) intracavity bottom, the magnetic attraction shaft coupling (12) of magnetic drum rotating shaft (3) bottom through being positioned at base (2) bottom drives with the turning axle of object under test and is connected; Install support (4) on the base (2), huge Magnetic Sensor (5) is fixed in support (4) and goes up, is positioned at magnetic drum (8) one sides, the circuit board of amplifying circuit and huge Magnetic Sensor (5) mount and are integral, and microcontroller circuit module board (7) is fixed in shell (6) inner chamber, magnetic drum (8) top; Shell (6) covers on outside each assembly, and shell (6) bottom is connected with base (2).
5. according to claim 2 or the fast mechanism of 3 described huge magnetic surveys, it is characterized in that:
It is NdFeB material that described magnetic drum (8) magnetic is got involved medium, and residual magnetic flux density is 0.5 * 10
3To 50 * 10
3Gauss.
6. the fast mechanism of huge magnetic survey according to claim 2 is characterized in that:
Described microcontroller circuit module is a CPLD.
7. the fast mechanism of huge magnetic survey according to claim 4 is characterized in that:
Between shell (6) and the base (2) the straight cutting bayonet socket is arranged.
8. the fast mechanism of huge magnetic survey according to claim 4 is characterized in that:
The output terminal of microcontroller circuit module has connector (9), connects accessory power outlet (10), and accessory power outlet (10) is fixed in shell (6) one sides.
9. the fast mechanism of huge magnetic survey according to claim 8 is characterized in that:
Described accessory power outlet (10) is the aviation socket.
10. the fast mechanism of huge magnetic survey according to claim 4 is characterized in that:
Base has fixed orifice on (2), and the bottom surface is embedded with O-ring seal (1), and base (2) is fixedlyed connected with the housing end face of rotating object to be measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200785341U CN201007719Y (en) | 2007-02-09 | 2007-02-09 | Giant magnetic sensor and giant magnetic sensor speedometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200785341U CN201007719Y (en) | 2007-02-09 | 2007-02-09 | Giant magnetic sensor and giant magnetic sensor speedometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201007719Y true CN201007719Y (en) | 2008-01-16 |
Family
ID=39003666
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200785341U Expired - Lifetime CN201007719Y (en) | 2007-02-09 | 2007-02-09 | Giant magnetic sensor and giant magnetic sensor speedometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201007719Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101298253B (en) * | 2008-06-23 | 2011-11-09 | 哈尔滨工业大学 | Wheel sensor |
| CN107221910A (en) * | 2017-06-14 | 2017-09-29 | 中北大学 | A kind of highly sensitive intelligent grid overload current broken circuit protecting equipment |
| CN107276016A (en) * | 2017-06-14 | 2017-10-20 | 中北大学 | Intelligent grid overload current open circuit protection method based on giant magnetoresistance magnetic susceptibility |
| CN111257587A (en) * | 2020-01-22 | 2020-06-09 | 武汉船用机械有限责任公司 | Rotating speed measuring device for double-speed motor |
-
2007
- 2007-02-09 CN CNU2007200785341U patent/CN201007719Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101298253B (en) * | 2008-06-23 | 2011-11-09 | 哈尔滨工业大学 | Wheel sensor |
| CN107221910A (en) * | 2017-06-14 | 2017-09-29 | 中北大学 | A kind of highly sensitive intelligent grid overload current broken circuit protecting equipment |
| CN107276016A (en) * | 2017-06-14 | 2017-10-20 | 中北大学 | Intelligent grid overload current open circuit protection method based on giant magnetoresistance magnetic susceptibility |
| CN107276016B (en) * | 2017-06-14 | 2018-11-30 | 中北大学 | Smart grid overload current open circuit protection method based on giant magnetoresistance magnetic susceptibility |
| CN111257587A (en) * | 2020-01-22 | 2020-06-09 | 武汉船用机械有限责任公司 | Rotating speed measuring device for double-speed motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20070209 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |