CN104716785A - Motor and motor rotor position detection method - Google Patents
Motor and motor rotor position detection method Download PDFInfo
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- CN104716785A CN104716785A CN201510137495.7A CN201510137495A CN104716785A CN 104716785 A CN104716785 A CN 104716785A CN 201510137495 A CN201510137495 A CN 201510137495A CN 104716785 A CN104716785 A CN 104716785A
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Abstract
The invention discloses a motor and a motor rotor position detection method. The motor comprises a shell and a rotor, wherein a stator is arranged in the shell and matched with the rotor. The rotor comprises a body and a central rotating shaft, the body is arranged on the central rotating shaft in a sleeving mode, a position information part is arranged at one end of the body and comprises a plurality of light reflecting symbol rings which are located on the same plane and are concentric, an information identifier is arranged on the shell and comprises multiple sets of photoelectric transmitting and receiving devices, and the photoelectric transmitting and receiving devices and the light reflecting symbol rings are in one-to-one correspondence. The motor can provide precise and accurate rotor position information, so that a good basis is provided for calculating the speed and judging the direction when the rotor operates, the size of the motor can be structurally controlled, and thus the motor can be suitable for more occasions.
Description
Technical field
The present invention relates to the detection method of a kind of motor and motor rotor position.
Background technology
At present, all with the replaceable independently encoder of entirety on most motor, this encoder can be used for detection rotor position, its advantage can select different encoders according to the difference of control position precision, but its overall cost is still higher generally, structure is also more complicated, volume is wayward, therefore requires that occasion that is certain but that have higher requirements to motor volume is just not too applicable for some to control precision.
Summary of the invention
Based on this, the object of the invention is to the defect overcoming prior art, the detection method of a kind of motor and motor rotor position is provided, this motor can provide high-precision, rotor position information accurately, thus provide good basis for rotor the running calculating of hourly velocity, the judgement in direction, this motor structurally can also control volume, thus can be applicable to more places.
Its technical scheme is as follows:
A kind of motor, comprise shell and rotor, in shell, be provided with stator, rotor and stator suitable, rotor comprises main body and central rotating shaft, main body is set on central rotating shaft, and one end of main body is provided with positional information portion, and positional information portion comprises multiple reflective symbol circle, multiple reflective symbol circle is in the same plane and its center is identical, shell is provided with information identification device, and information identification device comprises many cover photoelectric emission receiving systems, and photoelectric emission receiving system and reflective symbol enclose one_to_one corresponding.
Wherein in an embodiment, described positional information portion comprises reflective symbol circle A, reflective symbol circle B and reflective symbol circle Z, reflective symbol circle B is between reflective symbol circle A and reflective symbol circle Z, reflective symbol circle A comprises multiple first reflective lattice and multiple first non-reflective lattice, one, interval the first non-reflective lattice between two the first reflective lattice, reflective symbol circle B comprises multiple second reflective lattice and multiple second non-reflective lattice, one, interval the second non-reflective lattice between two the second reflective lattice, reflective symbol circle Z comprises connected the 3rd reflective lattice and the 3rd non-reflective lattice, each first reflective lattice are corresponding with the joint of one of them second reflective lattice and the second non-reflective lattice, 3rd reflective lattice are corresponding with the joint of one of them second reflective lattice and the second non-reflective lattice, described information identification device comprises three cover photoelectric emission receiving systems, three cover photoelectric emission receiving systems and reflective symbol enclose A, reflective symbol circle B, reflective symbol circle Z one_to_one corresponding respectively.
Wherein in an embodiment, described positional information portion comprises the reflective symbol circle A be arranged in order from outside to inside, reflective symbol circle B, reflective symbol circle Z, reflective symbol circle U, reflective symbol circle V and reflective symbol circle W, reflective symbol circle A comprises multiple first reflective lattice and multiple first non-reflective lattice, one, interval the first non-reflective lattice between two the first reflective lattice, reflective symbol circle B comprises multiple second reflective lattice and multiple second non-reflective lattice, one, interval the second non-reflective lattice between two the second reflective lattice, reflective symbol circle Z comprises connected the 3rd reflective lattice and the 3rd non-reflective lattice, reflective symbol circle U comprises multiple 4th reflective lattice and multiple 4th non-reflective lattice, one, interval the 4th non-reflective lattice between two the 4th reflective lattice, reflective symbol circle V comprises multiple 5th reflective lattice and multiple 5th non-reflective lattice, one, interval the 5th non-reflective lattice between two the 5th reflective lattice, reflective symbol circle W comprises multiple 6th reflective lattice and multiple 6th non-reflective lattice, one, interval the 6th non-reflective lattice between two the 6th reflective lattice, each first reflective lattice are corresponding with the joint of one of them second reflective lattice and the second non-reflective lattice, 3rd reflective lattice are corresponding with the joint of one of them second reflective lattice and the second non-reflective lattice, each 4th reflective lattice are corresponding with the joint of one of them the 5th reflective lattice and the 5th non-reflective lattice, each 5th reflective lattice are corresponding with the joint of one of them the 6th reflective lattice and the 6th non-reflective lattice, 3rd reflective lattice are corresponding with the 4th reflective lattice, described information identification device comprises six cover photoelectric emission receiving systems, six cover photoelectric emission receiving systems and reflective symbol enclose A, reflective symbol circle B, reflective symbol circle Z, reflective symbol circle U, reflective symbol circle V, reflective symbol circle W one_to_one corresponding respectively.
Wherein in an embodiment, described shell comprises cap, and cap is near described positional information portion, and described information identification device is arranged on cap.
Wherein in an embodiment, described photoelectric emission receiving system comprises infrared emission tube and infrared receiver transducer, infrared emission tube, infrared receiver transducer with reflective accord with enclose corresponding.
Wherein in an embodiment, described information identification device also comprises processor, and processor connects with infrared emission tube, infrared receiver sensor electrical.
A detection method for motor rotor position, comprises following concrete steps:
The body rotation of the stator energising rear drive rotor in shell, main body drives central rotating shaft to rotate;
Information identification device on shell is by the reflective symbol circle utilizing emitted light signal of photoelectric emission receiving system to correspondence, light signal reflects by reflective symbol circle, photoelectric emission receiving system receives the light signal be reflected back, and information identification device encloses the positional information that each photoelectric emission receiving system receives one to one Photoelectric Signal Processing is converted to now rotor encode with reflective symbol.
Wherein in an embodiment, photoelectric emission receiving system is launched, the concrete steps of receiving optical signals are: infrared emission tube is to reflective symbol circle utilizing emitted light signal, and infrared receiver transducer receives and enclosed by reflective symbol the light signal be reflected back.
Below the advantage of preceding solution or principle are described:
In the detection method of above-mentioned motor and motor rotor position, motor is by the photoelectric emission receiving system of information identification device on the shell reflective symbol circle utilizing emitted light signal to correspondence, light signal can be reflected back by reflective symbol circle, the light signal be reflected back is received by photoelectric emission receiving system again, and information identification device just can obtain the positional information coding of now rotor more after photosignal that photoelectric emission receiving system receives arranges by overlapping.Electric machine control system can obtain the positional information of rotor exactly by above-mentioned positional information coding, also can calculate speed and the rotation direction of rotor simultaneously exactly, thus can control the running of motor more well.In addition, compared with adopting the motor of encoder, this motor, by the frame mode of information identification device rotor position sensing information portion, can effectively reduce motor thickness or volume, make motor can meet more occasion.
Accompanying drawing explanation
Fig. 1 is the structural representation of the motor described in the embodiment of the present invention one;
Fig. 2 is the structural representation of the rotor described in the embodiment of the present invention one;
Fig. 3 is the structural representation in the positional information portion described in the embodiment of the present invention one;
Fig. 4 is the structural representation in the positional information portion described in the embodiment of the present invention two;
Description of reference numerals:
10, rotor, 11, main body, 12, central rotating shaft, 13, positional information portion, 131, reflective symbol circle A, 132, reflective symbol enclose B, 133, reflective symbol circle Z, 134, reflective symbol circle U, 135, reflective symbol encloses V, 136, reflective symbol circle W, f, position f, g, position g, 20, shell, 21, cap, 22, information identification device, a, position a, b, position b, c, position c.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described in detail:
Embodiment one
As shown in Figure 1-2, for a kind of motor, comprise shell 20 and rotor 10, stator is provided with in shell 20, rotor 10 is suitable with stator, rotor 10 comprises main body 11 and central rotating shaft 12, main body 11 is set on central rotating shaft 12, one end of main body 11 is provided with positional information portion 13, positional information portion 13 comprises multiple reflective symbol circle, and multiple reflective symbol circle is in the same plane and its center is identical, and shell 20 is provided with information identification device 22, information identification device 22 comprises many cover photoelectric emission receiving systems, and photoelectric emission receiving system and reflective symbol enclose one_to_one corresponding.In this motor, by the photoelectric emission receiving system of information identification device 22 on the shell 20 reflective symbol circle utilizing emitted light signal to correspondence, light signal can reflect back by reflective symbol circle, light signal after reflection is received by photoelectric emission receiving system again, and information identification device 22 just can obtain the positional information coding of now rotor 10 more after photosignal that photoelectric emission receiving system receives arranges by overlapping.Electric machine control system can obtain the positional information of rotor 10 exactly by above-mentioned positional information coding, also can calculate speed and the rotation direction of rotor 10 simultaneously exactly, thus can control the running of motor more well.
In the present embodiment, positional information portion 13 comprises reflective symbol circle A131, reflective symbol circle B132 and reflective symbol circle Z133, reflective symbol circle B132 is between reflective symbol circle A131 and reflective symbol circle Z133, reflective symbol circle A131 comprises multiple first reflective lattice and multiple first non-reflective lattice (as Fig. 3 shows, first reflective lattice, second reflective lattice, 3rd reflective lattice are white, first non-reflective lattice, second non-reflective lattice, 3rd non-reflective lattice are black), one, interval the first non-reflective lattice between two the first reflective lattice, reflective symbol circle B132 comprises multiple second reflective lattice and multiple second non-reflective lattice, one, interval the second non-reflective lattice between two the second reflective lattice, reflective symbol circle Z133 comprises connected the 3rd reflective lattice and the 3rd non-reflective lattice.Wherein, first reflective lattice, second reflective lattice, 3rd reflective lattice energy reflected light signal, first non-reflective lattice, second non-reflective lattice, 3rd non-reflective lattice can not reflected light signal, the upper first reflective lattice of reflective symbol circle A131, quantity and reflective symbol of the first non-reflective lattice enclose the upper second reflective lattice of B132, the quantity of the second non-reflective lattice can adjust according to the required precision of Electric Machine Control, first reflective lattice on reflective symbol circle A131 are with reflective to accord with the joint enclosing second reflective lattice on B132 and the second non-reflective lattice corresponding, namely the connecting line of the first reflective center of a lattice line and the second reflective lattice and the second non-reflective lattice coincides, the 3rd reflective lattice on reflective symbol circle Z133 are with reflective to accord with the joint enclosing the second reflective lattice on B132 and the second non-reflective lattice corresponding, namely the connecting line of the 3rd reflective center of a lattice line and the second reflective lattice and the second non-reflective lattice coincides (as Fig. 3 shows).
In the present embodiment, information identification device 22 comprises three cover photoelectric emission receiving systems, and three cover photoelectric emission receiving systems and reflective symbol enclose A131, reflective symbol circle B132, reflective symbol circle Z133 one_to_one corresponding respectively.Wherein, photoelectric emission receiving system comprises infrared emission tube and infrared receiver transducer, and infrared emission tube is to reflective symbol circle utilizing emitted light signal, and infrared receiver transducer receives and enclosed by reflective symbol the light signal be reflected back; Information identification device 22 also comprises processor, and processor connects with infrared emission tube, infrared receiver sensor electrical, for overlapping Photoelectric Signal Processing that photoelectric emission receiving system receives more and be converted to the positional information coding of now rotor 10.This positional information coding can be used for speed and the rotation direction that electric machine control system calculates rotor, is applicable to asynchronous machine.
In the present embodiment, shell 20 comprises cap 21, and cap 21 is near positional information portion 13, and information identification device 22 is arranged on cap 21, if broken down, directly changes relevant parts, very convenient easy to operate.And, compared with adopting the motor of encoder, can effectively reduce motor thickness or volume, make motor can meet more occasion.
A detection method for motor rotor position, comprises following concrete steps:
The main body 11 of the stator energising rear drive rotor 10 in shell 20 is rotated, and main body 11 drives central rotating shaft 12 to rotate;
Simultaneously, information identification device 22 on shell 20 is by the reflective symbol circle utilizing emitted light signal of photoelectric emission receiving system to correspondence, light signal reflects by reflective symbol circle, photoelectric emission receiving system receives the light signal be reflected back, information identification device encloses the positional information that each photoelectric emission receiving system receives one to one Photoelectric Signal Processing is converted to now rotor 10 encode with reflective symbol, and the conduction of this positional information coding can be used for its speed calculating rotor and rotation direction to electric machine control system.Wherein, photoelectric emission receiving system is launched, the concrete steps of receiving optical signals are: infrared emission tube is to reflective symbol circle utilizing emitted light signal, and infrared receiver transducer receives and enclosed by reflective symbol the light signal be reflected back.
As shown in Figure 3, when rotor 10 turns to position a (position that information identification device 22 faces), reflective symbol circle A131 is the first reflective lattice of energy reflected light signal, reflective symbol circle B132 is the second reflective lattice of energy reflected light signal, reflective symbol circle Z133 position is can not the 3rd non-reflective lattice of reflected light signal, after being processed by information identification device 22, reflective symbol circle A131, reflective symbol circle B132 corresponds to high level, reflective symbol circle Z133 corresponds to low level, namely position signalling is now encoded to: a-signal is 1, B signal is 1, Z signal is 0,
(the position that information identification device 22 faces when if rotor 10 rotates clockwise position b from position a, below in like manner), reflective symbol circle A131 position corresponds to the first non-reflective lattice, reflective symbol circle B132 position corresponds to the second reflective lattice, reflective symbol circle Z133 position corresponds to the 3rd non-reflective lattice, after being processed by information identification device 22, reflective symbol circle A131, reflective symbol circle Z133 are low level, reflective symbol circle B132 is high level, namely position signalling is now encoded to: a-signal is 0, B signal is 1, Z signal is 0.Then the information recorded in current information and the first step can be compared by electric machine control system (not marking in figure), namely a-signal is changed to 1 → 0, B signal intensity is 1 → 1, Z signal is 0 → 0, then electric machine control system can offer an explanation out motor steering is clockwise, if when rotor 10 rotates counterclockwise position c from position a, reflective symbol circle A131 position corresponds to the first reflective lattice, reflective symbol circle B132 position corresponds to the second non-reflective lattice, reflective symbol circle Z133 position corresponds to the 3rd non-reflective lattice, after being processed by information identification device 22, reflective symbol circle A131 is high level, reflective symbol circle B132, reflective symbol circle Z133 is low level, namely position signalling is now encoded to: a-signal is 1, B signal is 0, Z signal is 0, then the information recorded in current information and the first step can be compared by electric machine control system, namely a-signal is changed to 1 → 1, B signal intensity is 1 → 0, Z signal is 0 → 0, then electric machine control system can offer an explanation out motor steering is counterclockwise,
After rotor 10 rotates certain time interval T, 1 → 0 transition times N of A131 signal or reflective symbol circle B132 signal is enclosed according to reflective symbol, namely calculate the rotating speed of motor by formula V=N/T*k (rev/min), k is the constant relevant to tachometric survey.
And if rotor 10 turns to position d, reflective symbol circle Z133 position corresponds to the 3rd reflective lattice, after being processed by information identification device 22, reflective symbol circle Z133 is high level, then electric machine control system can be offered an explanation out rotor 10 and forwarded default, a specific position to, then can carry out calculation correction to the rotating speed of motor.
In above-mentioned, by the accurate detection to rotor 10 position, electric machine control system can be made accurately, effectively to control the running of motor.
Embodiment two
Be with the difference of embodiment one: positional information portion 13 comprises reflective symbol the be arranged in order from outside to inside and encloses A131, reflective symbol circle B132, reflective symbol circle Z133, reflective symbol circle U134, reflective symbol circle V135 and reflective symbol circle W136, reflective symbol circle U134 comprises multiple 4th reflective lattice and multiple 4th non-reflective lattice, one, interval the 4th non-reflective lattice between two the 4th reflective lattice, reflective symbol circle V135 comprises multiple 5th reflective lattice and multiple 5th non-reflective lattice, one, interval the 5th non-reflective lattice between two the 5th reflective lattice, reflective symbol circle W136 comprises multiple 6th reflective lattice and multiple 6th non-reflective lattice, one, interval the 6th non-reflective lattice between two the 6th reflective lattice, as shown in Figure 4.Wherein, the 4th reflective lattice, the 5th reflective lattice, the 6th reflective lattice are white, and the 4th non-reflective lattice, the 5th non-reflective lattice, the 6th non-reflective lattice are black.The 4th reflective lattice on reflective symbol circle U134 are with reflective to accord with the joint enclosing the 5th reflective lattice on V135 and the 5th non-reflective lattice corresponding, namely the 4th reflective lattice of 1/3rd just to 1/3rd the 5th reflective lattice, the 4th reflective lattice of 2/3rds just to 2/3rds the 5th non-reflective lattice; The 5th reflective lattice on reflective symbol circle V134 are with reflective to accord with the joint enclosing the 6th reflective lattice on W135 and the 6th non-reflective lattice corresponding, namely the 5th reflective lattice of 1/3rd just to 1/3rd the 6th reflective lattice, the 5th reflective lattice of 2/3rds just to 2/3rds the 6th non-reflective lattice.In addition, information identification device 22 comprises six cover photoelectric emission receiving systems, six cover photoelectric emission receiving systems and reflective symbol enclose A131, reflective symbol circle B132, reflective symbol circle Z133, reflective symbol circle U134, reflective symbol circle V135, reflective symbol circle W136 one_to_one corresponding respectively, then:
The position signalling at f place is encoded to: a-signal is 1, B signal be 0, Z signal is 0, and U signal is 1, and V signal is 1, W signal is 0; The position signalling at g place is encoded to: a-signal is 0, B signal be 1, Z signal is 0, and U signal is 1, and V signal is 0, W signal is 0.Be applicable to synchronous machine.
Each technical characteristic of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this specification is recorded.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (8)
1. a motor, is characterized in that, comprises shell and rotor, stator is provided with in shell, rotor and stator suitable, rotor comprises main body and central rotating shaft, and main body is set on central rotating shaft, one end of main body is provided with positional information portion, positional information portion comprises multiple reflective symbol circle, and multiple reflective symbol circle is in the same plane and its center is identical, and shell is provided with information identification device, information identification device comprises many cover photoelectric emission receiving systems, and photoelectric emission receiving system and reflective symbol enclose one_to_one corresponding.
2. motor according to claim 1, it is characterized in that, described positional information portion comprises reflective symbol circle A, reflective symbol circle B and reflective symbol circle Z, reflective symbol circle B is between reflective symbol circle A and reflective symbol circle Z, reflective symbol circle A comprises multiple first reflective lattice and multiple first non-reflective lattice, one, interval the first non-reflective lattice between two the first reflective lattice, reflective symbol circle B comprises multiple second reflective lattice and multiple second non-reflective lattice, one, interval the second non-reflective lattice between two the second reflective lattice, reflective symbol circle Z comprises connected the 3rd reflective lattice and the 3rd non-reflective lattice, each first reflective lattice are corresponding with the joint of one of them second reflective lattice and the second non-reflective lattice, 3rd reflective lattice are corresponding with the joint of one of them second reflective lattice and the second non-reflective lattice, described information identification device comprises three cover photoelectric emission receiving systems, three cover photoelectric emission receiving systems and reflective symbol enclose A, reflective symbol circle B, reflective symbol circle Z one_to_one corresponding respectively.
3. motor according to claim 1, it is characterized in that, described positional information portion comprises the reflective symbol circle A be arranged in order from outside to inside, reflective symbol circle B, reflective symbol circle Z, reflective symbol circle U, reflective symbol circle V and reflective symbol circle W, reflective symbol circle A comprises multiple first reflective lattice and multiple first non-reflective lattice, one, interval the first non-reflective lattice between two the first reflective lattice, reflective symbol circle B comprises multiple second reflective lattice and multiple second non-reflective lattice, one, interval the second non-reflective lattice between two the second reflective lattice, reflective symbol circle Z comprises connected the 3rd reflective lattice and the 3rd non-reflective lattice, reflective symbol circle U comprises multiple 4th reflective lattice and multiple 4th non-reflective lattice, one, interval the 4th non-reflective lattice between two the 4th reflective lattice, reflective symbol circle V comprises multiple 5th reflective lattice and multiple 5th non-reflective lattice, one, interval the 5th non-reflective lattice between two the 5th reflective lattice, reflective symbol circle W comprises multiple 6th reflective lattice and multiple 6th non-reflective lattice, one, interval the 6th non-reflective lattice between two the 6th reflective lattice, each first reflective lattice are corresponding with the joint of one of them second reflective lattice and the second non-reflective lattice, 3rd reflective lattice are corresponding with the joint of one of them second reflective lattice and the second non-reflective lattice, each 4th reflective lattice are corresponding with the joint of one of them the 5th reflective lattice and the 5th non-reflective lattice, each 5th reflective lattice are corresponding with the joint of one of them the 6th reflective lattice and the 6th non-reflective lattice, 3rd reflective lattice are corresponding with the 4th reflective lattice, described information identification device comprises six cover photoelectric emission receiving systems, six cover photoelectric emission receiving systems and reflective symbol enclose A, reflective symbol circle B, reflective symbol circle Z, reflective symbol circle U, reflective symbol circle V, reflective symbol circle W one_to_one corresponding respectively.
4. motor according to any one of claim 1 to 3, is characterized in that, described shell comprises cap, and cap is near described positional information portion, and described information identification device is arranged on cap.
5. motor according to any one of claim 1 to 3, is characterized in that, described photoelectric emission receiving system comprises infrared emission tube and infrared receiver transducer, infrared emission tube, infrared receiver transducer with reflective accord with enclose corresponding.
6. motor according to claim 5, is characterized in that, described information identification device also comprises processor, and processor connects with infrared emission tube, infrared receiver sensor electrical.
7. a detection method for motor rotor position, is characterized in that, comprises following concrete steps:
The body rotation of the stator energising rear drive rotor in shell, main body drives central rotating shaft to rotate;
Information identification device on shell is by the reflective symbol circle utilizing emitted light signal of photoelectric emission receiving system to correspondence, light signal reflects by reflective symbol circle, photoelectric emission receiving system receives the light signal be reflected back, and information identification device encloses the positional information that each photoelectric emission receiving system receives one to one Photoelectric Signal Processing is converted to now rotor encode with reflective symbol.
8. the detection method of motor rotor position according to claim 7, it is characterized in that, photoelectric emission receiving system is launched, the concrete steps of receiving optical signals are: infrared emission tube is to reflective symbol circle utilizing emitted light signal, and infrared receiver transducer receives and enclosed by reflective symbol the light signal be reflected back.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510137495.7A CN104716785B (en) | 2015-03-26 | 2015-03-26 | Motor and motor rotor position detection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510137495.7A CN104716785B (en) | 2015-03-26 | 2015-03-26 | Motor and motor rotor position detection method |
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| CN104716785A true CN104716785A (en) | 2015-06-17 |
| CN104716785B CN104716785B (en) | 2017-05-10 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2343648A1 (en) * | 1973-08-30 | 1975-03-13 | Portescap | Midget DC or stepping motor - determines rotational speed and/or angular position of motor shaft |
| JPH08159812A (en) * | 1994-12-08 | 1996-06-21 | Matsushita Electric Ind Co Ltd | Rotary encoder |
| US20050023451A1 (en) * | 2001-11-16 | 2005-02-03 | Horton Steven John | Angular position sensor |
| CN1992479A (en) * | 2005-12-28 | 2007-07-04 | 马渊马达株式会社 | Optical encoder device for small-sized motor and method of producing the same |
-
2015
- 2015-03-26 CN CN201510137495.7A patent/CN104716785B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2343648A1 (en) * | 1973-08-30 | 1975-03-13 | Portescap | Midget DC or stepping motor - determines rotational speed and/or angular position of motor shaft |
| JPH08159812A (en) * | 1994-12-08 | 1996-06-21 | Matsushita Electric Ind Co Ltd | Rotary encoder |
| US20050023451A1 (en) * | 2001-11-16 | 2005-02-03 | Horton Steven John | Angular position sensor |
| CN1992479A (en) * | 2005-12-28 | 2007-07-04 | 马渊马达株式会社 | Optical encoder device for small-sized motor and method of producing the same |
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| CN104716785B (en) | 2017-05-10 |
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