CN202471096U - Absolute type encoding disk based on giant magnetoresistive angle sensor - Google Patents
Absolute type encoding disk based on giant magnetoresistive angle sensor Download PDFInfo
- Publication number
- CN202471096U CN202471096U CN2012201325736U CN201220132573U CN202471096U CN 202471096 U CN202471096 U CN 202471096U CN 2012201325736 U CN2012201325736 U CN 2012201325736U CN 201220132573 U CN201220132573 U CN 201220132573U CN 202471096 U CN202471096 U CN 202471096U
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- angular transducer
- giant magnetoresistance
- code
- magnetoresistance angular
- magnet
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Abstract
An absolute type encoding disk based on a giant magnetoresistive angle sensor comprises a magnet body and a cylindrical stainless steel casing, wherein the magnet body is mounted on the rotor shaft of a motor by a fastener; and the interior of the cylindrical stainless steel casing is hollow; the stainless steel casing is in close fit with the motor by a fastener, and the rotor shaft of the motor is sleeved into from the opening of the stainless steel casing; a circuit board is adhered to the stainless steel casing on the inner surface of the bottom of the cylindrical stainless steel casing, and the surface is sealed by waterproof adhesive; the main device on the circuit board is the giant magnetoresistive angle sensor, the circuit board is positioned at the axis of the cylindrical stainless steel casing and is in bilateral symmetry taking the axis of the cylindrical stainless steel casing as the symmetrical axis; and the distance between the giant magnetoresistive angle sensor and the magnet body is less than or equal to 5 mm. Compared with other encoding disks and rotary transformers, the absolute type encoding disk based on the giant magnetoresistive angle sensor, provided by the utility model, is convenient to mount and long in service life.
Description
Technical field
The utility model belongs to the electron controls technology field, is specifically related to a kind of code-wheel based on the giant magnetoresistance angular transducer.
Background technology
At present, motor is widely used in the every field such as daily life, commercial production.Sewing machine from daily washing machine, air-conditioning, electric automobile to industrial circle, numerically-controlled machine etc., motor all has critical role therein.Wherein, Electric Machine Control is the core technology of machine field, the domestic research and development that have how tame research institution and enterprise all to be devoted to Electric Machine Control at present.And in the motor rotation process, the accurate measurement of motor rotor position and speed is again the most important thing of Motor Control Field.Now, adopted for the measurement of motor rotor position and speed is the scheme of photoelectric coded disk and rotary transformer more.But, photoelectric encoder exist install complicated, easy to wear, be subject to shortcomings such as interference, precision deficiency, rotary transformer also comes with some shortcomings, like the cost height, reliability is relatively poor, the life-span is short etc.Along with the discovery of giant magnetoresistance effect and the appearance of giant magneto-resistance sensor, the utility model provides through code-wheel and detect motor rotor position and rotating speed based on the giant magnetoresistance angular transducer.And, find that the code-wheel precision based on the giant magnetoresistance angular transducer is high, easy for installation, be not subject to interference, the life-span is long.
The utility model content
The purpose of the utility model is to propose a kind of easy for installation, code-wheel based on the giant magnetoresistance angular transducer that precision is high, is used for the measurement of motor rotor position and speed.
The first aspect of the utility model provides a kind of code-wheel based on the giant magnetoresistance angular transducer, it is characterized in that, comprising: a magnet is installed in this magnet on the rotor axis of electric through securing member; A hollow housing; Opening with a corresponding aforementioned motor armature spindle, this housing is assembled in motor through securing member, and the aforementioned motor armature spindle is inserted in from opening part; Respective magnet is posted circuit board on the inboard end face of housing; Giant magnetoresistance angular transducer on the circuit board with corresponding aforementioned magnet, this circuit board is positioned at the cylinder axis place equally, is the axis of symmetry left-right symmetric with the cylinder axis; And, the external processing unit that can accept and handle said giant magnetoresistance angular transducer data, said giant magnetoresistance angular transducer is connected with the external processing unit signal.
Said giant magnetoresistance angular transducer and magnet distance are less than 5mm.
Said housing is a cylindrical housings.
Said housing is the stainless steel of soft magnetism.
On the said housing, opening an aperture near near the position the giant magneto-resistance sensor, the communication pin wire harness of giant magneto-resistance sensor is drawn from this aperture with the external processing unit signal be connected.
Said wire harness is connected on the outside connector of aperture, and external processing unit is connected on this connector, thereby sensor is connected with the external processing unit signal.
The center of said giant magnetoresistance angular transducer and magnet all is positioned on the cylinder axis of said housing.
Said external processing unit is a single-chip microcomputer.
It is a kind of through measure the scheme of motor rotor position and speed based on the specific coding dish of giant magnetoresistance angular transducer that the second aspect of the utility model provides.The code-wheel magnet is connected with rotor axis of electric, and code-wheel armature spindle rotating speed, rotational angle and rotor axis of electric rotating speed, rotational angle are identical so.Rotation of code-wheel magnet and armature spindle produces and the corresponding magnetic field of rotor.The magnetic field that giant magnetoresistance angular transducer induction code device magnet produces directly obtains angle information, so just can obtain the absolute angle of rotor.And turning over the required time of certain angle through measuring rotor, through calculating the speed that just can obtain rotor.
The characteristics of the utility model are:
(1) the utility model provides a kind of absolute encoding dish based on the giant magnetoresistance angular transducer, with respect to other code-wheel, rotary transformer, easy for installation, long service life.
(2) the utility model provides and a kind ofly measure the scheme of motor position and rotating speed based on the absolute encoding dish of giant magnetoresistance angular transducer, precision is high, measurement result is accurate.
Description of drawings
Fig. 1 illustrates the structure along the axis tangent plane according to the scrambler of the utility model embodiment
Fig. 2 illustrates the structure according to the inside of the scrambler of the utility model embodiment.
Embodiment
Below with reference to the general principle of description of drawings the utility model.
Fig. 1 shows the structure according to the code-wheel of the utility model embodiment.As shown in Figure 1, comprise a magnet 1 according to the code-wheel of the utility model embodiment, be installed in this magnet on the armature spindle 9 of motor 8 through securing member 2 (prior art gets final product); Columniform Stainless Steel Shell 3; This right cylinder inside is hollow; This Stainless Steel Shell and motor fit tightly, and through securing member 11 Stainless Steel Shell are fixed on the motor, and rotor axis of electric is inserted in from the Stainless Steel Shell opening part; Make the right cylinder complete closed, and the rotor axis overlaps fully with cylinder axis.
Said stainless steel is a kind of existing alloy that nickel, chromium are processed that in iron, mixes; And be equivalent in metal, mix soft magnetic material; Make right cylinder internal magnetic field and external magnetic field isolate fully; Avoided the influence of magnetic field that other object produces except that motor, made measurement result more accurate measuring.
Of Fig. 1, on the Stainless Steel Shell of right cylinder bottom interior surface, stick circuit board 4, and the surface is sealed with marine glue, preventing into also to avoid it to come off in the water.Main devices on the circuit board is the giant magnetoresistance angular transducer, and this circuit board is positioned at the cylinder axis place equally, is the axis of symmetry left-right symmetric with the cylinder axis.Like this, just make the center of giant magnetoresistance angular transducer and scrambler magnet all be positioned on the cylinder axis, and both are relative.Make the giant magnetoresistance angular transducer can measure the strongest part of magnetic induction in the magnetic field that the scrambler magnet produces, make measurement result more accurate.Giant magnetoresistance angular transducer and scrambler magnet distance are no more than 5mm.If the distance is too far, possibly make the magnetic induction effect weaken, and makes measurement result inaccurate.On Stainless Steel Shell, opening an aperture 5 near near the position the giant magneto-resistance sensor, the communication pin of giant magneto-resistance sensor is made wire harness 6 from this aperture, draw.Wire harness is connected on the outside connector 7 of aperture, and external processing unit 10 is connected on this connector, thereby makes sensor and external processing unit can carry out communication.
The material phenomenon that resistance changes under certain magnetic field is called " magnetoresistance ", and magnetic metal and alloy material generally all have this magneto-resistor phenomenon, and generally, the resistivity of material only produces slight reducing in magnetic field; Under certain condition, the amplitude that resistivity reduces is quite big, than surplus the magnetoelectricity resistance high approximately 10 of common magnetic metal and alloy material times, is called " giant magnetoresistance effect " (GMR).Huge magnetic group effect is used on the angular transducer, has produced the giant magnetoresistance angular transducer, utilizes the variation that changes of magnetic field can detection angles.This angular transducer can accurately be measured 0 ° to 360 ° steering angle unusually, and it comprises two GMR full-bridges, temperature sensor, two analog to digital converters and internal mechanism that can these assemblies of continuous monitoring in operational process.Two digital components of giant magnetoresistance angular transducer through taking measurement of an angle: sine value and cosine value can obtain angle.The giant magnetoresistance angular transducer that the utility model uses also can send to external processing unit through SPI (asynchronous serial communication) interface with this angle value, and the utility model uses single-chip microcomputer as external processing unit, and the angle value that sensor obtains is handled.
The utility model is connected the magnet of scrambler with the armature spindle of motor, then the velocity of rotation of the magnet of scrambler and rotor axis of electric is identical with rotational angle.The code-wheel magnet is along with rotation of rotor, and the rotational angle of measuring the scrambler magnet so also just is equal to the rotational angle of measuring rotor.The magnetic field that giant magnetoresistance angular transducer induction code device magnet produces directly obtains angle information, so just can obtain the absolute angle of rotor.
The utility model makes the SPI communication pin of the giant magnetoresistance angular transducer in the scrambler after wire harness draws, and is connected with the SPI pin of single-chip microcomputer, and the angle value that sensor is obtained sends single-chip microcomputer to and handles, thereby obtains the velocity amplitude of rotor.The scrambler magnet that single-chip microcomputer record sensor measurement arrives rotates one period that angle is used, turns to angle Φ such as measuring motor
1The time time t
1And turn to angle Φ
2The time t
2Single-chip microcomputer just can obtain the speed of motor through following formula.
Only the above person is merely the preferred embodiment of the utility model, when not limiting the utility model practical range with this; So, allly change and modify according to the utility model claim and the simple equivalent done of creation description, all should still belong in the scope that the utility model patent contains.
Claims (10)
1. the code-wheel based on the giant magnetoresistance angular transducer is characterized in that, comprising:
A magnet is installed in this magnet on the rotor axis of electric through securing member;
A hollow housing; Opening with a corresponding aforementioned motor armature spindle, this housing is assembled in motor through securing member, and the aforementioned motor armature spindle is inserted in from opening part; Respective magnet is posted circuit board on the inboard end face of housing; Giant magnetoresistance angular transducer on the circuit board with corresponding aforementioned magnet, this circuit board is positioned at the cylinder axis place equally, is the axis of symmetry left-right symmetric with the cylinder axis; And
The external processing unit that can accept and handle said giant magnetoresistance angular transducer data, said giant magnetoresistance angular transducer is connected with the external processing unit signal.
2. the code-wheel based on the giant magnetoresistance angular transducer as claimed in claim 1 is characterized in that: said giant magnetoresistance angular transducer and magnet distance are less than 5mm.
3. the code-wheel based on the giant magnetoresistance angular transducer as claimed in claim 1 is characterized in that: said housing is a cylindrical housings.
4. the code-wheel based on the giant magnetoresistance angular transducer as claimed in claim 3 is characterized in that: said housing is the stainless steel of soft magnetism.
5. like each described code-wheel of claim 1-4 based on the giant magnetoresistance angular transducer; It is characterized in that: on the said housing; Opening an aperture near near the position the giant magneto-resistance sensor, the communication pin wire harness of giant magneto-resistance sensor is drawn from this aperture with the external processing unit signal be connected.
6. the code-wheel based on the giant magnetoresistance angular transducer as claimed in claim 5 is characterized in that: said wire harness is connected on the outside connector of aperture, and external processing unit is connected on this connector, thereby sensor is connected with the external processing unit signal.
7. like each described code-wheel based on the giant magnetoresistance angular transducer of claim 3, it is characterized in that: the center of said giant magnetoresistance angular transducer and magnet all is positioned on the cylinder axis of said housing.
8. like each described code-wheel based on the giant magnetoresistance angular transducer of claim 1-4, it is characterized in that: said external processing unit is a single-chip microcomputer.
9. like each described code-wheel based on the giant magnetoresistance angular transducer of claim 1-4, it is characterized in that: said circuit board is also sealed the surface with marine glue.
10. like each described code-wheel of claim 1-4, it is characterized in that based on the giant magnetoresistance angular transducer: after the aforementioned motor armature spindle is inserted in from opening part, said housing complete closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201325736U CN202471096U (en) | 2012-03-31 | 2012-03-31 | Absolute type encoding disk based on giant magnetoresistive angle sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012201325736U CN202471096U (en) | 2012-03-31 | 2012-03-31 | Absolute type encoding disk based on giant magnetoresistive angle sensor |
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| Publication Number | Publication Date |
|---|---|
| CN202471096U true CN202471096U (en) | 2012-10-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012201325736U Expired - Fee Related CN202471096U (en) | 2012-03-31 | 2012-03-31 | Absolute type encoding disk based on giant magnetoresistive angle sensor |
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| Country | Link |
|---|---|
| CN (1) | CN202471096U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111765841A (en) * | 2020-07-01 | 2020-10-13 | 清华四川能源互联网研究院 | Non-contact angle displacement sensor based on giant magnetoresistance effect and measurement method |
-
2012
- 2012-03-31 CN CN2012201325736U patent/CN202471096U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111765841A (en) * | 2020-07-01 | 2020-10-13 | 清华四川能源互联网研究院 | Non-contact angle displacement sensor based on giant magnetoresistance effect and measurement method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121003 Termination date: 20150331 |
|
| EXPY | Termination of patent right or utility model |