CN1704723A - Four-sensor style coding device - Google Patents
Four-sensor style coding device Download PDFInfo
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- CN1704723A CN1704723A CN 200410024190 CN200410024190A CN1704723A CN 1704723 A CN1704723 A CN 1704723A CN 200410024190 CN200410024190 CN 200410024190 CN 200410024190 A CN200410024190 A CN 200410024190A CN 1704723 A CN1704723 A CN 1704723A
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Abstract
This invention relates to the photoelectric sensor technology, which sets four sensors uniformly-spaced on the inside wall of a ring stator and sets a permanent magnet on the axle wire of the stator cavity, one end of the magnet is fixed on a coupling, the other end of the coupling is processed to a flat bayonet, the output signals of two non-adjacent magnetic sensors are separately connected with a differential amplifier, the output signal of which is connected with a AD converter connected with a multiplier, the output signal of a factor corrector is connected with the other input of the multiplier, its output signal is connected with the input of the synthesizer the output signal of which is taken as the input of a first and a second storage, the other output signal of the synthesizer and the other output signal of the second storage is connected with the input end of the factor corrector, the output signal of the first storage is connected with an angle transformer.
Description
Affiliated technical field
The invention belongs to the photoelectric sense technology field, but specifically a kind of magnetic encoder of measurement axis rotational angle.
Background technology
The rotation photoelectric encoder is that light harvesting, mechanical, electrical technology are in rotating speed, the displacement transducer of one.Its structure and principle of work such as Fig. 1-1, when the scrambler axle drives the code-disc rotation, logical, the dark areas of the light transmission code-disc that light-emitting component sends (perhaps round grating and indication grating), be divided into interrupted light and be received element and receive, produce initialize signal, this signal after follow-up processing of circuit, output pulse signal.Photoelectric encoder has experienced the evolution from the increment type to the absolute type.
During the rotation of incremental encoder axle, drive the grating disc spins, the light that light-emitting component sends is cut into interrupted light by the slit of grating dish, indication grating and is received element and receives, output has corresponding pulse signal, and the increase and decrease of its sense of rotation and number of pulses needs to realize by the direction judgment circuit sum counter at rear portion.Its counting starting point can be set arbitrarily, and can realize infinitely adding up and measuring of multi-turn.The Z signal of a pulse can also sending revolution is as the reference mechanical zero.Fixing when umber of pulse, and when need improving resolution, can utilize A, the B two paths of signals of 90 ° of phase differential, frequency multiplication is carried out in former pulse.Increment of rotation formula scrambler is the output pulse when rotating, and knows its position by counting equipment, and is motionless or when having a power failure when scrambler, relies on the memory internal of counting equipment to remember the position.Like this, after having a power failure, scrambler can not have any moving, when incoming call work, in the scrambler output pulse process, can not have and disturb and pulse-losing, not so, will be offset the zero point of counting equipment memory, and the amount of this skew is unable to find out, and only vicious production result just can know after occurring.The method that solves is to increase reference point, and scrambler is every through reference point, and the into memory area of counting equipment is revised in the reference position.Before reference point, be the accuracy that can not guarantee the position.For this reason, in industry control, just there is each operation to look for reference point earlier, methods such as start small change.Such as, the location of printer scanner is exactly the incremental encoder principle of usefulness, each start, and we can both hear a burst of sound of Pi mile crack, it is just worked then looking for reference zero.The numerically-controlled machine of utilization incremental encoder in the control loop must return zero earlier after the start with each, could correct execution processing instruction.Such method is cumbersome to some industry control project, does not even allow start small change (will know accurate position after the start), so the appearance of absolute encoder has just been arranged.
During the rotation of absolute optical encoder axle, output and position be code (scale-of-two, binary-coded decimal etc.) one to one.Can differentiate positive dirction, displacement from the code size variation, and residing absolute position, need not direction judgment circuit.It has an absolute zero position code, after power failure or shutdown, when start remeasures again, still can read the code that has a power failure or shut down the position exactly, and find the zero-bit code exactly.Absolute encoder is divided from measurement range, and two types of individual pen and multi-turns are arranged.Absolute encoder is to represent the position, angle of axle by reading pattern on the code-wheel, the coded graphics of Fig. 1-2 for simplifying, and actual code-disc is to cut apart more labyrinth.Many roads groove is arranged on the optical code disk, and the per pass groove is from the inside to surface successively with 2 lines, 4 lines, 8 lines, 16 lines ... layout like this, in each position of scrambler, by reading logical (among the figure white part), dark (the deceiving) of per pass groove, obtains one group from 2
0To 2
N-12 unique scale codings, this just is called n position absolute encoder.The coded system of absolute encoder has pure binary coding and reflected code etc.Absolute encoder has determined the uniqueness of each position by mechanical location, and it need not power-failure memory, need not to look for reference point, and need not count always, when needs location aware, when just goes to read its position.Like this, the reliability of the noiseproof feature of scrambler, data has improved greatly.Because absolute encoder is better than incremental encoder significantly aspect the location, be applied to angle, linear measure longimetry and positioning control in the various industrial systems more and more.There are some shortcomings that are difficult to overcome in photoelectric encoder
The use aspect:
(1) it is limited that the fragility of glass material makes its impact resistance, has easily brokenly than the occasion of strong motion at some, thereby stability and reliability are difficult to assurance in the case
(2) because ruling span has ultimate value (20 μ m are to 10 μ m), improve resolving power (figure place) if desired, just must increase the code-disc diameter, so be difficult to accomplish miniaturization;
The production aspect:
(1) groove of glass code-disc requires precision very high, and is also very high to the accuracy requirement of mechanical part, so for the product of high resolution, be difficult to reduce cost, precision is high more, and cost performance is just low more comparatively speaking;
(2) to guarantee to measure accurately, very high assembly precision must be arranged, will have influence on the raising of production efficiency like this.
Because there is above shortcoming in photoelectric encoder, bigger in some impacts, perhaps want the less precision of cube higher occasion, be difficult to adhere to specification; The manufacturing accuracy of parts such as high precision code-disc is difficult to reach in addition, and cost is difficult to reduce, and occurs if having with performance low price product, and photoelectric encoder will be in a disadvantageous position in market competition.
At these shortcomings of photoelectric encoder, the development of magnetic encoder in recent years launches just gradually.
Sensor stator and rotor are made with pure iron, and fixed permanent magnet on the stator forms magnetic circuit system.Mill tooth and groove equably on the stator annular end face relative with rotor, the two teeth groove number equates that rotor tightens up with axle, and axle is connected with tested revolving shaft.Axle drives rotor rotation, when rotor tooth is relative with stator tooth, and air gap minimum, whole magnetic circuit magnetic flux maximum; Magnetic flux minimum when tooth is relative with groove.Produce pulse voltage output with coil or magneto sensor induction flux change, change frequency is directly proportional with rotating speed.This type of scrambler survey rotating ratio is more common, and it is very low to be used for surveying the rotational angle precision, can only realize increment output.
Summary of the invention
In order to overcome the existing limited easy fragmentation of photoelectric encoder impact resistance, high resolution (figure place) just must increase the code-disc diameter, so be difficult to accomplish miniaturization, and precision is low, anti-interference is poor, the processing cost height, the restricted technical deficiency of the scope of application, the invention provides a kind of four-sensor formula magnetic encoder, this code device precision height, vulnerability to jamming be good, guaranteeing can to realize high resolution under the little preceding topic of volume.Utilization is fixed on magneto sensor impression on the stator circumference and is fixed on magnet steel on the axle and rotates the change of magnetic field strength that causes and export the voltage signal that out of phase changes, and judges an axle rotational angle with magnitude of voltage.
The technical solution adopted for the present invention to solve the technical problems is: be provided with the circular ring type stator, be on the same circumference in the center of circle on the madial wall of stator, with the center of stator, be provided with four magnetic sensors, angle between two adjacent sensors is 90 °, the axis of bore of stator is provided with the permanent magnet that is wrapped with sheath, one end of permanent magnet and shaft coupling one end are fixed, and the other end of shaft coupling is processed with flat bayonet socket;
Non-conterminous two magnetic sensors (211), (213) output signal (A1), (A2) connect differential amplifier (1), two other non-conterminous magnetic sensor (212), (214) output signal (B1), (B2) connect differential amplifier (2), differential amplifier (1) output signal (A0) connects AD converter (3), the output signal (Ad) of AD converter (3) connects multiplier (5), differential amplifier (2) output signal (B0) connects AD converter (4), the output signal (Bd) of AD converter (4) connects multiplier (6), coefficient correction device (10) output signal (K) connects the input end of multiplier (5) and multiplier (6), the output signal (A) of multiplier (5) and multiplier (6), (B) engage the input end of grow up to be a useful person (7), the output signal (D) of compositor (7) is as the input signal end of first memory (8) and second memory (9), compositor (7) output signal (R1) and second memory output signal (R0) connect the input end of coefficient correction device (10), and the output signal of first memory connects angle transverter (11);
Coefficient correction device (10) is connected in series successively by subtracter (101), divider (102), α multiplier (-icator) (103) and totalizer (104), another input end of divider (102) is connected with another input end of subtracter (101), the output signal (R0) of this input termination second memory (9), another input end of subtracter (101) engages (7) output signal (R1) of growing up to be a useful person.
The invention has the beneficial effects as follows, utilization is fixed on magneto sensor impression on the stator circumference and is fixed on magnet steel on the axle and rotates the change of magnetic field strength that causes and export the voltage signal that out of phase changes, judge the axle rotational angle with magnitude of voltage, thereby realize the measurement of high-precision velocity of rotation and absolute position, this code device good impact resistance, have higher vulnerability to jamming, guaranteeing to realize high resolution under the little preceding topic of volume.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is a physical construction synoptic diagram of the present invention.
Fig. 2 is the annexation synoptic diagram of stator and magnetic sensor among Fig. 1.
Fig. 3 is circuit theory diagrams of the present invention.
Fig. 4 is the circuit theory diagrams of coefficient correction device among Fig. 3.
1. differential amplifiers among the figure, 2. differential amplifier, 3.AD converter, 4.AD converter, 5. multiplier, 6. multiplier, 7. combining amplifier, 8. first memory, 9. second memory, 10. coefficient correction device, 11. angle transverters, 21. stators, 22. shaft coupling, 23. sheaths, 24. permanent magnets, 25. bayonet socket, 210. stator supports, 101. subtracters, 102. divider 103. α multiplier (-icator)s, 104. totalizers, 211. sensors, 212. sensor, 213. sensors, 214. sensors, A1. sensor output signal, A2. sensor output signal, B1. sensor output signal, B2. sensor output signal, A0. differential amplifier output signal, B0. differential amplifier output signal, Ad.AD converter output signal, Bd.AD converter output signal, A. multiplier output signal, B. multiplier output signal, D. compositor output signal, R0. second memory output signal, R1. compositor output signal, K. coefficient correction device output signal, J0 first memory output signal.
Embodiment
At Fig. 1, stator among Fig. 2 (21) is a cirque structure, one end of stator (21) is installed on the stator support (210), on the madial wall of stator (21), center with stator (21) is on the same circumference in the center of circle, be provided with four sensors (211), (212), (213), (214), angle between two adjacent sensors is 90 °, the axis of stator (21) inner chamber is provided with the permanent magnet (24) that is wrapped with sheath (23), one end of permanent magnet (24) and shaft coupling (22) other end are fixed, the other end of shaft coupling (22) is processed with pancake bayonet socket (25), can and be attached thereto the sheath (23) that connects with shaft coupling (22) by this bayonet socket (25), permanent magnet (24) is securely fixed in the tested rotating shaft, thereby does not need to install separately the rotation that rotating shaft can realize permanent magnet 24.
In Fig. 3, four magnetic sensors (211), (212), (213), (214) will monitor the rotating shaft rotary state, the location status of rotating shaft is converted into electric signal (A1), (A2), (B1), (B2), non-conterminous two magnetic sensors (211) on quadrant position, (213) output signal (A1), (A2) connect differential amplifier (1), two other non-conterminous magnetic sensor (212), (214) output signal (B1), (B2) connect differential amplifier (2), differential amplifier (1) output signal (A0) connects AD converter (3), the output signal (Ad) of AD converter (3) connects multiplier (5), differential amplifier (2) output signal (B0) connects AD converter (4), the output signal (Bd) of AD converter (4) connects multiplier (6), coefficient correction device (10) output signal (K) connects the input end of multiplier (5) and multiplier (6), the output signal (A) of multiplier (5) and multiplier (6), (B) engage the input end of grow up to be a useful person (7), the output signal (D) of compositor (7) is as the input end of first memory (8) and second memory (9), compositor (7) output signal R1 and second memory output signal R0 connect the input end of coefficient correction device (10), and the output signal of first memory connects angle transverter (11).
Among the present invention
X_I represents the I position of data X; It is I bit position from left to right at data X.The 0th of data X the Far Left wherein at data X; The I position
When data X was signed number, the 0th of data X was its sign bit.
X_0=1 represents that data X is a negative; X_0=0 represents that data X is a positive number.
X_D represents the value bit of data X, on the right of the sign bit of data X and near sign bit.
{ X_a; X_b; X_c} represents the data X that forms by Fig. 6 mode.
Data structure is
| X_a | X_b | X_c |
The output of compositor of the present invention (7) is in the following manner:
If (A_D＞=B_D)
D＝{A_0；B_0；B_D}
R1＝A
Otherwise
D＝{A_0；B_0；A_D}
R1＝B
In Fig. 4, the coefficient correction device is by subtracter (101), divider (102), α multiplier (-icator) (103) and totalizer (104) are connected in series successively and form, the output signal (R0) of second memory (9) and the output signal (R1) of compositor (7) connect two input ends of subtracter (101), the output signal (E1) of subtracter (101) connects divider (102) input end, another input end of divider (102) also joins with the output signal (R0) of second memory (9), the output signal (E2) of divider (102) connects α multiplier (-icator) (103), the output signal (E3) of α multiplier (-icator) (103) connects the input end of totalizer (104), and the output signal of totalizer (104) is the signal input part that the output signal (K) of coefficient correction device (10) connects multiplier (5) and multiplier (6) respectively.
The present invention form coefficient correction device (10) subtracter (101), divider (102), α multiplier (-icator) (103) and totalizer (104) output in the following manner:
E1＝R0-R1
E2＝E1/R0
0＜α＜1
E3＝α?E2
K(i)＝K(i-1)+E3；i＝0，1，2...K(0)＝1
I is a sampling sequence number, is 0 when beginning to sample
The present invention's differential amplifier 1 described above, differential amplifier 2, AD converter 3, AD converter 4, multiplier 5, multiplier 6, combining amplifier 7, first memory 8, second memory 9, coefficient correction device 10, angle transverter 11, subtracter 101, divider 102, α multiplier (-icator) 103, totalizer 104, magnetic sensor 211, magnetic sensor 212, magnetic sensor 213, the circuit structure of magnetic sensor 214 are that this area ordinary person is known public, and this no longer is repeated in this description its structural principle.
Claims (1)
1, a kind of four-sensor formula code device, be provided with the circular ring type stator, it is characterized in that on the madial wall of stator, be on the same circumference in the center of circle with the center of stator, be provided with four roller magnetic sensors, angle between two adjacent sensors is 90 °, the axis of bore of stator is provided with the permanent magnet that is wrapped with sheath, and an end of permanent magnet and shaft coupling one end are fixed, and the other end of shaft coupling is processed with flat bayonet socket; Non-conterminous two magnetic sensors (211), (213) output signal (A1), (A2) connect differential amplifier (1), two other non-conterminous magnetic sensor (212), (214) output signal (B1), (B2) connect differential amplifier (2), differential amplifier (1) output signal (A0) connects AD converter (3), the output signal (Ad) of AD converter (3) connects multiplier (5), differential amplifier (2) output signal (B0) connects AD converter (4), the output signal (Bd) of AD converter (4) connects multiplier (6), coefficient correction device (10) output signal (K) connects the input end of multiplier (5) and multiplier (6), the output signal (A) of multiplier (5) and multiplier (6), (B) engage the input end of grow up to be a useful person (7), the output signal (D) of compositor (7) is as the input signal end of first memory (8) and second memory (9), compositor (7) output signal (R1) and second memory output signal (R0) connect the input end of coefficient correction device (10), and the output signal of first memory connects angle transverter (11); The coefficient correction device is connected in series successively by subtracter (101), divider (102), α multiplier (-icator) (103) and totalizer (104), another input end of divider (102) is connected with another input end of subtracter (101), the output signal (R0) of this input termination second memory (9), another input end of subtracter (101) engages (7) output signal (R1) of growing up to be a useful person.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100241907A CN100339684C (en) | 2004-06-03 | 2004-06-03 | Four-sensor style coding device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100241907A CN100339684C (en) | 2004-06-03 | 2004-06-03 | Four-sensor style coding device |
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| Publication Number | Publication Date |
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| CN1704723A true CN1704723A (en) | 2005-12-07 |
| CN100339684C CN100339684C (en) | 2007-09-26 |
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| CNB2004100241907A Expired - Fee Related CN100339684C (en) | 2004-06-03 | 2004-06-03 | Four-sensor style coding device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010124592A1 (en) * | 2009-04-30 | 2010-11-04 | 浙江关西电机有限公司 | Motor |
| WO2010124598A1 (en) * | 2009-04-30 | 2010-11-04 | 浙江关西电机有限公司 | Servo power steering system and control method thereof |
| WO2010124587A1 (en) * | 2009-04-30 | 2010-11-04 | 浙江关西电机有限公司 | Position detection device and signal processing device and method thereof |
| WO2010124573A1 (en) * | 2009-04-30 | 2010-11-04 | 浙江关西电机有限公司 | Magnetically conductive ring |
| CN102843118A (en) * | 2011-07-04 | 2012-12-26 | 合康变频科技（武汉）有限公司 | Quadrupling and sensing method and device for quadrature encoder |
| CN104677387A (en) * | 2015-03-25 | 2015-06-03 | 广东欧珀移动通信有限公司 | Detection method and device for protective jackets of intelligent equipment |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3901546A1 (en) * | 1987-08-07 | 1990-08-02 | Heidenhain Gmbh Dr Johannes | Position measuring device having a plurality of scanning points |
| US5519393A (en) * | 1993-07-22 | 1996-05-21 | Bouens, Inc. | Absolute digital position encoder with multiple sensors per track |
| EP0733197A4 (en) * | 1993-12-06 | 1997-02-12 | Analogic Corp | Apparatus for and method of measuring geometric, positional and kinematic parameters of a rotating device |
| CN1243956C (en) * | 1997-09-08 | 2006-03-01 | 株式会社安川电机 | Magnetic encoder |
-
2004
- 2004-06-03 CN CNB2004100241907A patent/CN100339684C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010124592A1 (en) * | 2009-04-30 | 2010-11-04 | 浙江关西电机有限公司 | Motor |
| WO2010124598A1 (en) * | 2009-04-30 | 2010-11-04 | 浙江关西电机有限公司 | Servo power steering system and control method thereof |
| WO2010124587A1 (en) * | 2009-04-30 | 2010-11-04 | 浙江关西电机有限公司 | Position detection device and signal processing device and method thereof |
| WO2010124573A1 (en) * | 2009-04-30 | 2010-11-04 | 浙江关西电机有限公司 | Magnetically conductive ring |
| CN101877526B (en) * | 2009-04-30 | 2012-10-31 | 浙江中科德润科技有限公司 | Electric motor |
| CN102843118A (en) * | 2011-07-04 | 2012-12-26 | 合康变频科技（武汉）有限公司 | Quadrupling and sensing method and device for quadrature encoder |
| CN104677387A (en) * | 2015-03-25 | 2015-06-03 | 广东欧珀移动通信有限公司 | Detection method and device for protective jackets of intelligent equipment |
| CN104677387B (en) * | 2015-03-25 | 2017-06-23 | 广东欧珀移动通信有限公司 | Smart machine protective case detection method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100339684C (en) | 2007-09-26 |
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Owner name: WEIHAI EASTERN POWER CO., LTD. Free format text: FORMER OWNER: WEIHAI HUAKONG ELECTRICAL CO., LTD. Effective date: 20121219 |
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