CN109742906B - Magnetic encoder and installation method thereof - Google Patents
Magnetic encoder and installation method thereof Download PDFInfo
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- CN109742906B CN109742906B CN201910071036.1A CN201910071036A CN109742906B CN 109742906 B CN109742906 B CN 109742906B CN 201910071036 A CN201910071036 A CN 201910071036A CN 109742906 B CN109742906 B CN 109742906B
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Abstract
The present invention relates to a magnetic encoder comprising: a housing; the permanent magnet is connected with the magnetism isolating adapter; a magnetism isolating adapter configured to be capable of being connected with a shaft of a device under test; and one or more fixing devices configured to be connectable with the device under test such that a distance between the housing and the device under test is fixed. The invention also relates to a method for mounting a magnetic encoder. By means of the invention, it is possible to better replace the photoelectric encoder, thus avoiding the above-mentioned disadvantages of the photoelectric encoder, while at the same time compensating for tolerances due to the shaft and the end cover plate themselves and/or the shaft movement, thus maintaining a high accuracy of the magnetic encoder.
Description
Technical Field
The present invention relates generally to the field of automation control, and more particularly to a magnetic encoder. The invention further relates to a method for mounting a magnetic encoder.
Background
In recent years, the field of clean energy shows a rapid development trend. The clean energy is a novel energy, and has the advantages of wide distribution, reproducibility, small environmental pollution and the like compared with the traditional fossil fuel. Wind power generators are increasingly used as representatives of clean energy.
An important part of the automated control of wind turbines is the measurement of the generator operating conditions, such as the mechanical position of the rotor. For this purpose, a photoelectric encoder is generally used, wherein the photoelectric encoder is a sensor that converts a mechanical geometric displacement amount of an output shaft into a pulse or a digital amount by photoelectric conversion. However, the precision grating used in the photoelectric encoder is not only costly, but also vulnerable to damage due to generator vibration and shock, and the bearings of the photoelectric encoder are subject to failure due to stress. In addition, the measurement of the photoelectric encoder has high requirement on cleanliness, so if the sealing fails, oil stain, moisture and water intruding into the shell can also cause the photoelectric encoder to fail. In addition, the existing photoelectric encoder adopts a mounting structure of a rolling bearing and a torque arm, so that the construction cost is high, the accuracy is easy to reduce after long-time operation, and even the encoder fails.
Disclosure of Invention
Starting from the prior art, the task of the present invention is to provide a magnetic encoder and a mounting method thereof, by which a photoelectric encoder can be better replaced, thereby avoiding the above-mentioned disadvantages of the photoelectric encoder, and at the same time, the problem of large and uncertain tolerance between the shaft of the motor and the end cover plate in mass production can be solved, and the high accuracy and robustness of the magnetic encoder can be maintained.
In a first aspect of the invention, this task is solved by a magnetic encoder comprising:
a housing;
the permanent magnet is connected with the magnetism isolating adapter;
a magnetism isolating adapter configured to be capable of being connected with a shaft of a device under test; and
one or more fixtures configured to be connectable with a device under test such that a distance between the housing and the device under test is fixed.
The present invention is based on the following insight of the inventors: the inventor researches and discovers that the main reasons of the accuracy reduction and the failure of the existing photoelectric encoder are as follows: (a) due to poor operating environment, the encoder is sealed and fails, and is easily corroded by pollutants, dust and water; (b) because the encoder is directly connected with the shaft through the bearing, the bearing and the grating are easily damaged by vibration and impact; (c) more importantly, due to manufacturing tolerances of the shaft and variations in the circular run-out tolerance of the shaft during operation; by adopting the magnetic encoder of the magnetic field detection principle, the bearing-free and direct contact, the electrical insulation and the isolation are realized, and the reliability and the durability are improved. The relative axial position between the magnetic encoder and the shaft can be kept fixed by not using bearings but by adding axial adjustment and fixing means, compensating for manufacturing tolerances between the mass-produced central shaft itself and the end cover plate by adjusting said axial distance via said fixing means; in addition, the use of a sleeve bushing positioned in cooperation with the shaft spigot in combination with a plurality of fixtures also enables adjustment of the plane on which the encoder is located (at least three points defining a plane) to center or register the magnetic encoder.
In a preferred embodiment of the invention, it is provided that the one or more fastening means comprise a plurality of fastening means, wherein the fastening means are also configured to be able to adjust the distance between the housing and the device under test such that the housing can be centered relative to the axis. Through the preferred scheme, the adjustable structure with the shaft as the initial positioning reference of the shell is realized, the distance between the shell and the equipment to be tested can be adjusted and maintained, and the surface of the shell can be arranged by adjusting the distance between the shell and the equipment to be tested at the plurality of fixing devices, so that the shell is centered, registered, adjusted in distance and the like relative to the shaft.
In a further preferred embodiment of the invention, it is provided that the plurality of fastening devices comprises 3 fastening devices. Due to the principle that 3 points determine one surface, it is possible with this preferred solution to set the surface on which the housing is located better by adjusting 3 fixtures, so that a better centering is achieved. It should be noted here that other numbers of fixtures are also conceivable, depending on the application scenario.
In a further preferred aspect of the invention, it is provided that each of the one or more fixing devices comprises:
a bolt capable of passing through at least a portion of the housing and an end cover plate of the device under test to connect the housing with the device under test; and
3 nuts including a first nut, a second nut, and a third nut, wherein the first nut is configured to secure the bolt relative to the housing, and the second and third nuts are configured to secure the bolt relative to the end cap plate.
By means of the preferred solution, a low-cost fixing device and a simple mounting manner can be achieved, and the distance between the housing and the device to be tested can be accurately adjusted by screwing the nut. It should be noted here that other forms of fixing means, such as connecting screws, connecting tabs, snap-lock connections with projections, etc., are also conceivable under the teaching of the present invention.
In a further preferred embodiment of the invention, it is provided that the device under test is a wind turbine. By using the magnetic encoder for rotor position measurement of a wind turbine generator, costs of the magnetic encoder, such as construction costs, installation costs and maintenance costs, can be reduced.
In a second aspect of the invention, the aforementioned task is solved by a method for mounting a magnetic encoder, comprising the steps of:
connecting the permanent magnet with a magnetism isolating adapter;
connecting the magnetism isolating adapter with a shaft of the equipment to be tested;
installing a shell; and
the housing is connected to the device under test using one or more fixtures such that the distance between the housing and the device under test is fixed.
In a preferred aspect of the invention, it is provided that the one or more fixation devices comprise a plurality of fixation devices, the method further comprising:
the distance between the housing and the device under test is adjusted by operating the fixing means so that the housing can be centered with respect to the shaft.
By the preferred scheme, the distance between the shell and the equipment to be tested can be adjusted and maintained, and the surface of the shell can be arranged by adjusting the distance between the shell and the equipment to be tested at the plurality of fixing devices, so that the shell can be centered, registered and the like relative to the shaft.
In a further preferred embodiment of the invention, it is provided that the plurality of fastening devices comprises 3 fastening devices, wherein the adjustment of the distance between the housing and the device under test by actuating the fastening devices comprises:
determining a plane in which the housing or the permanent magnet should lie;
determining, from the plane, nominal distances that the housing should be at from the device under test at the 3 fixtures, respectively; and
the 3 fixtures are used to adjust the distance between the housing and the device under test at the 3 fixtures to the nominal distance, respectively.
Due to the principle that 3 points determine one surface, it is possible with this preferred solution to set the surface on which the housing is located better by adjusting 3 fixtures, so that a better centering is achieved. It should be noted here that other numbers of fixtures are also conceivable, such as 2 or 4 fixtures, depending on the application scenario.
In a further preferred aspect of the present invention, it is provided that each of the one or more fixing means includes a bolt and 3 nuts, wherein adjusting the distance between the housing and the device under test by operating the fixing means includes:
penetrating a bolt through at least one part of the shell and an end cover plate of the equipment to be tested;
fixing the bolt relative to the housing using a first nut; and
the bolt is secured relative to the end cover plate using second and third nuts.
By means of the preferred solution, a low-cost fixing device and a simple mounting manner can be achieved, and the distance between the housing and the device to be tested can be accurately adjusted by screwing the nut. It should be noted here that other forms of fixing means, such as connecting screws, connecting tabs, snap-in connections with projections (e.g. flanges) etc. are also conceivable under the teaching of the present invention.
In a further preferred embodiment of the invention, it is provided that the device under test is a wind turbine. By using the magnetic encoder for rotor position measurement of a wind turbine generator, costs of the magnetic encoder, such as construction costs, installation costs and maintenance costs, can be reduced. It should be noted here that the invention is not limited to this, but can also be used for other devices under test, such as turbines, direct or alternating current motors, etc.
The invention has at least the following beneficial effects: (1) the magnetic encoder can be applied to various devices to be tested, particularly wind driven generators, instead of a photoelectric encoder, so that high construction cost, installation cost and maintenance cost of the photoelectric encoder are avoided; (2) in addition, the invention can keep the fixed distance, namely the axial distance, between the shell of the magnetic encoder and the equipment to be tested, thereby avoiding the measurement error caused by the manufacturing error of the shaft and the end cover plate or the shaft abrasion or the motor operation; (3) in addition, the invention can also simply and cheaply center the magnetic encoder on the equipment to be measured and keep the registration state, thereby further improving the measurement precision.
Drawings
The invention is further elucidated with reference to specific embodiments in the following description, in conjunction with the appended drawings.
FIG. 1 shows a cross-sectional view of a magnetic encoder according to the present invention;
FIG. 2 shows a back view of a device under test mounted with a magnetic encoder according to the present invention; and
FIG. 3 illustrates a method flow for mounting a magnetic encoder in accordance with the present invention.
Detailed Description
It should be noted that the components in the figures may be exaggerated and not necessarily to scale for illustrative purposes. In the figures, identical or functionally identical components are provided with the same reference symbols.
In the present invention, "disposed on …", "disposed over …" and "disposed over …" do not exclude the presence of an intermediate therebetween, unless otherwise specified. Further, "disposed on or above …" merely indicates the relative positional relationship between two components, and may also be converted to "disposed below or below …" and vice versa in certain cases, such as after reversing the product direction.
In the present invention, the embodiments are only intended to illustrate the aspects of the present invention, and should not be construed as limiting.
In the present invention, the terms "a" and "an" do not exclude the presence of a plurality of elements, unless otherwise specified.
It is further noted herein that in embodiments of the present invention, only a portion of the components or assemblies may be shown for clarity and simplicity, but those of ordinary skill in the art will appreciate that, given the teachings of the present invention, required components or assemblies may be added as needed in a particular scenario.
It is also noted herein that, within the scope of the present invention, the terms "same", "equal", and the like do not mean that the two values are absolutely equal, but allow some reasonable error, that is, the terms also encompass "substantially the same", "substantially equal".
The numbering of the steps of the methods of the present invention does not limit the order of execution of the steps of the methods. Unless specifically stated, the method steps may be performed in a different order.
The present invention is based on the following insight of the inventors: the inventor researches and discovers that the main reasons of the accuracy reduction and the failure of the existing photoelectric encoder are as follows: (a) due to poor operating environment, the encoder is sealed and fails, and is easily corroded by pollutants, dust and water; (b) because the encoder is directly connected with the shaft through the bearing, the bearing and the grating are easily damaged by vibration and impact; (c) more importantly, due to manufacturing tolerances of the shaft and variations in the circular run-out tolerance of the shaft during operation; by adopting the magnetic encoder of the magnetic field detection principle, the bearing-free and direct contact, the electrical insulation and the isolation are realized, and the reliability and the durability are improved. The relative axial position between the magnetic encoder and the shaft can be kept fixed by not using bearings but by adding axial adjustment and fixing means, compensating for manufacturing tolerances between the mass-produced central shaft itself and the end cover plate by adjusting said axial distance via said fixing means; in addition, the use of a sleeve bushing positioned in cooperation with the shaft spigot in combination with a plurality of fixtures also enables adjustment of the plane on which the encoder is located (at least three points defining a plane) to center or register the magnetic encoder.
The invention is illustrated below with reference to specific examples.
FIG. 1 shows a cross-sectional view of a magnetic encoder 100 according to the present invention.
As shown in fig. 1, the magnetic encoder 100 includes a housing 101, and a permanent magnet 102, a magnetism isolating adapter 103, and a fixture disposed within the housing 101, wherein the permanent magnet 102 is connected or engaged with the magnetism isolating adapter 103, and the magnetism isolating adapter 103 is in turn connected to a shaft 106 of a device under test 105. The magnetic isolation adapter 103 is configured to isolate the magnetic field between the permanent magnet and the side of the device under test 105, thereby preventing the permanent magnet magnetic field from being disturbed, thereby affecting the mechanical position measurement of the shaft 106 of the device under test 105. The magnetic isolation adapter 103 is, for example, in the form of a bolt structure, and is made of a non-magnetic material (e.g., copper, aluminum, etc.), and has a screw thread at its tail. The magnetic isolation adapter 103 may be threaded into the central bore of the shaft 106 and tightened to complete the permanent magnet fixing installation, for example. In the case of a wind turbine, the magnetic isolation adapter 103 can isolate the main magnetic field of the generator from the magnetic field of the permanent magnets mounted. To further reduce the influence, it is also possible to arrange the magnetic encoder at the most distal end of the main magnetic field of the generator to be remote from the main magnetic field of the generator. The device under test 105 may also be other mechanical devices. In the case of a wind turbine, the shaft 106 is, for example, a small shaft rotating outside the generator slip ring box. The main body of the housing 101 can be connected or contacted to the device under test 105, for example, via a sleeve bushing 104, wherein the sleeve bushing 104, for example made of plastic, can radially position the entire magnetic encoder 100, thereby meeting the encoder radial high-precision requirements. The sleeve bushing 104 functions as an initial location and also functions to protect the shaft 106 and the housing 101 during generator operation after the housing 101 of the magnetic encoder 100 is fully secured, and little wear during operation does not affect the use and performance of the magnetic encoder 100. In other embodiments, the housing 101 may also be directly connected to the device under test 105.
In the present embodiment, the fixing means is shown as a threaded connection comprising a bolt 107 and 3 nuts, i.e. a first, a second and a third nut 108 and 110. It should be noted here that other forms of fixing means, such as connecting screws, connecting tabs, snap-in connections with projections (e.g. flanges) etc. are also conceivable under the teaching of the present invention. In fig. 1, bolt 107 passes through a portion of housing 101 and through end cap plate 201 of device under test 105 to connect the housing with the device under test. For the fixation, 3 nuts are provided, which cooperate with the bolt 107, including a first nut 108, a second nut 109 and a third nut 110, wherein the first nut 108 is arranged on the surface of the housing 101 to fix the bolt 107 with respect to the housing 101, and the second and third nuts 109, 110 are arranged on both sides of the end cover plate 201 to fix the bolt 107 with respect to said end cover plate 201, that is, the first nut 108 mainly plays a role in fixing the magnetic encoder 100, while the second and third nuts 109, 110 can adjust the axial position of the magnetic encoder 100 (or the housing 101 thereof), thereby meeting the tolerance requirements of the mounting surface. Since the fixing position of the nut 108 and the nut 110 can be changed on the bolt 107, the axial distance between the housing 101 and the device under test 105 or the shaft 106 thereof can be adjusted by adjusting the fixing position of the nut 108 and the nut 110, so as to compensate the manufacturing tolerance of the shaft 106 or the displacement between the shaft 106 and the end cover plate 201, thereby ensuring the accuracy of the magnetic encoder 100. The reason for this is, for example, that by maintaining the axial distance, the air gap of the permanent magnet 102 within the housing remains constant, thus providing a more stable and accurate position measurement during rotation of the shaft 106.
The operation of the magnetic encoder 100 is explained below. When the generator operates, the permanent magnet 102 and the shaft 106 rotate together, the sensor chip of the sensor circuit board in the shell 101 converts the detected magnetic field change into position information, and the position information is subjected to signal conversion processing and shaping, and finally differential driving signal form output is realized so as to meet the requirement of long-distance signal transmission driven by a long cable. The magnetic encoder 100 may be disposed at the extreme distal end of the main generator field to reduce the possibility of magnetic interference of the generator field with the magnetic encoder. The principles by which the encoder 100 measures mechanical position are known in the art and therefore will not be further described herein in order not to obscure the present invention.
Furthermore, although only one fixing device is shown in fig. 1, a plurality of fixing devices may be arranged. In the case where a plurality of, for example, 3 or more fixing devices are arranged, the face on which the housing is placed can be set by adjusting the distance between the housing 101 and the device under test 105 at each fixing device by the fixing devices, respectively, thereby centering, registering, or the like the housing with respect to the axis. Due to the principle that 3 points determine one surface, the surface on which the housing is located can be more stably set by adjusting 3 fixtures for better centering or registration.
FIG. 2 shows a back view of a device under test 105 with a magnetic encoder 100 according to the present invention mounted thereon.
As can be seen in fig. 2, the shaft 106 of the device under test 105 passes through the end cover plate 201 of the generator slip ring box of the device under test 105 and is free to rotate. Because the whole slip ring box body is composed of sheet metal parts and welding parts, the axial tolerance is large and uncertain (such as about +/-5 mm), the magnetic encoder has accurate requirement on the distance between the permanent magnet and the sensor chip on the circuit board and smaller tolerance (such as 1mm +/-0.5 mm), and the radial centering size also has strict requirement. Simple and rational mounting of the magnetic encoder is a great challenge. However, in the case of a magnetic encoder 100 equipped with the present invention, axial displacement between the shaft 106 and the end cover plate 201 and manufacturing tolerances of the shaft 106 can be effectively compensated for, so that the tolerances meet the above requirements, thereby ensuring accuracy of the magnetic encoder 100.
The invention has at least the following beneficial effects: (1) the magnetic encoder can be applied to various devices to be tested, particularly wind driven generators, instead of a photoelectric encoder, so that high construction cost, installation cost and maintenance cost of the photoelectric encoder are avoided; (2) in addition, the invention can keep the fixed distance, namely the axial distance, between the shell of the magnetic encoder and the equipment to be tested, thereby avoiding the measurement error caused by the manufacturing error of the shaft and the end cover plate or the shaft abrasion or the motor operation; (3) in addition, the invention can also simply and cheaply center the magnetic encoder on the equipment to be measured and keep the registration state, thereby further improving the measurement precision.
FIG. 3 illustrates a method flow 300 for mounting a magnetic encoder in accordance with the present invention, wherein the dashed boxes represent optional steps.
In step 302, a permanent magnet is connected to a magnetic isolation adapter.
In step 304, the magnetic isolation adapter is connected to the shaft of the device under test. In the present invention, unless otherwise stated, the term "connected" may include various mechanical connection means, such as welding, riveting, screwing, gluing, snap-fit connection, snap-lock connection, engagement, and the like.
At step 305, the housing is installed. The main body of the housing and the device under test may be connected, for example, by a sleeve bushing.
At step 306, the housing is connected with the device under test using one or more fixtures such that the distance between the housing and the device under test is fixed. In this case, the (axial) distance between the housing and the device under test can be adjusted by actuating the fixing device before final setting.
In optional step 308, a plane is determined in which the housing or permanent magnet should lie. This may be determined, for example, from registration or centering requirements.
In optional step 310, nominal distances at which the housing should be spaced from the device under test at the plurality of (e.g., 3) fixtures, respectively, are determined based on the plane. This can be determined, for example, by corresponding measurements and mathematical calculations. In the case of a bushing, the fixing surface can be determined by the surface of the bushing and the axial distance by the form-fitting relationship of the spigot of the bushing with the shaft.
At optional step 312, the distance between the housing and the device under test at the plurality of fixtures is adjusted to the nominal distance using the plurality of fixtures, respectively. In the case of a threaded connection, the position of the nuts on the bolt is adjusted individually to adjust the distance of the housing from the device under test at the threaded connection. In the case of a bushing, the fixing means are adjusted to bring the encoder into a fixing plane defined by the surface of the bushing and to bring the encoder at the respective fixing means into an axial distance defined by the bushing from the housing or the shaft.
The invention has the following characteristics: the cost is low, the original photoelectric encoder can be well replaced, and the cost is reduced by 70-90%. (ii) a The installation is simple and convenient, no bearing and direct contact are realized, and the electrical insulation isolation is realized; the device is resistant to pollutants, dustproof and water, high in reliability and durability, integrated with a circuit and small in size; an adjustable mounting structure with a shaft as a shell initial positioning reference is designed, so that the difficult problem that the tolerance between a generator shaft and an end cover plate is large and uncertain is solved; the permanent magnet and the encoder shell are positioned by means of machined surfaces, so that high precision is guaranteed, namely, the permanent magnet is positioned by adopting a shaft center hole to guarantee high geometric tolerance, and the encoder shell is positioned by adopting a shaft spigot so that high geometric tolerance and axial radial positioning can be guaranteed; the differential output long-line driving circuit has long-cable transmission capability of driving signals.
Although some embodiments of the present invention have been described herein, those skilled in the art will appreciate that they have been presented by way of example only. Numerous variations, substitutions and modifications will occur to those skilled in the art in light of the teachings of the present invention without departing from the scope thereof. It is intended that the following claims define the scope of the invention and that methods and structures within the scope of these claims and their equivalents be covered thereby.
Claims (6)
1. A magnetic encoder, comprising:
a housing;
the permanent magnet is connected with the magnetism isolating adapter;
a magnetism isolating adapter configured to be capable of being connected with a shaft of a device under test; and
3 fixing devices configured to be connectable with a device under test such that a distance between the housing and the device under test is fixed, wherein the 3 fixing devices are further configured to be able to adjust the distance between the housing and the device under test to set a plane in which the housing is located, such that the housing can be centered with respect to the axis, wherein adjusting the distance between the housing and the device under test to set the plane in which the housing is located includes:
determining a plane in which the housing or the permanent magnet should lie;
determining, from the plane, nominal distances that the housing should be at from the device under test at the 3 fixtures, respectively; and
the 3 fixtures are used to adjust the distance between the housing and the device under test at the 3 fixtures to the nominal distance, respectively.
2. The magnetic encoder of claim 1, wherein each of the fixtures comprises:
a bolt capable of passing through at least a portion of the housing and an end cover plate of the device under test to connect the housing with the device under test; and
3 nuts including a first nut, a second nut, and a third nut, wherein the first nut is configured to secure the bolt relative to the housing, and the second and third nuts are configured to secure the bolt relative to the end cap plate.
3. The magnetic encoder of claim 1, wherein the device under test is a wind-powered generator.
4. A method for mounting a magnetic encoder, comprising the steps of:
connecting the permanent magnet with a magnetism isolating adapter;
connecting the magnetism isolating adapter with a shaft of the equipment to be tested;
installing a shell;
connecting the housing with the device under test using 3 fixing devices such that a distance between the housing and the device under test is fixed, wherein adjusting the distance between the housing and the device under test using the 3 fixing devices to set a plane on which the housing is located such that the housing can be centered with respect to the axis, wherein adjusting the distance between the housing and the device under test by operating the 3 fixing devices comprises:
determining a plane in which the housing or the permanent magnet should lie;
determining, from the plane, nominal distances that the housing should be at from the device under test at the 3 fixtures, respectively; and
the 3 fixtures are used to adjust the distance between the housing and the device under test at the 3 fixtures to the nominal distance, respectively.
5. The method of claim 4, wherein each of the fixtures comprises a bolt and 3 nuts, wherein adjusting the distance between the housing and the device under test by operating the fixtures comprises:
penetrating a bolt through at least one part of the shell and an end cover plate of the equipment to be tested;
fixing the bolt relative to the housing using a first nut; and
the bolt is secured relative to the end cover plate using second and third nuts.
6. The method of claim 4, wherein the device under test is a wind turbine.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910071036.1A CN109742906B (en) | 2019-01-25 | 2019-01-25 | Magnetic encoder and installation method thereof |
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| CN201910071036.1A CN109742906B (en) | 2019-01-25 | 2019-01-25 | Magnetic encoder and installation method thereof |
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| CN109742906B true CN109742906B (en) | 2020-08-14 |
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| CN103296839A (en) * | 2013-06-17 | 2013-09-11 | 日本电产凯宇汽车电器（江苏）有限公司 | Steering motor with magnetic rotating coder |
| CN104333178A (en) * | 2014-11-15 | 2015-02-04 | 江门海力数控电机有限公司 | Motor encoder switch connection structure and installation method thereof |
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| CN107819385A (en) * | 2016-09-06 | 2018-03-20 | 日本电产三协株式会社 | Motor |
| CN108061006A (en) * | 2016-11-09 | 2018-05-22 | 苏州博拉腾信息科技有限公司 | Wind turbine generator system variable pitch encoder |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10216376B4 (en) * | 2002-04-12 | 2005-08-25 | Sick Stegmann Gmbh | Rotation angle measuring system |
| DE102012201644A1 (en) * | 2012-02-03 | 2013-08-08 | Robert Bosch Gmbh | Electric machine |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103296839A (en) * | 2013-06-17 | 2013-09-11 | 日本电产凯宇汽车电器（江苏）有限公司 | Steering motor with magnetic rotating coder |
| CN104333178A (en) * | 2014-11-15 | 2015-02-04 | 江门海力数控电机有限公司 | Motor encoder switch connection structure and installation method thereof |
| CN106090009A (en) * | 2015-04-29 | 2016-11-09 | 斯凯孚磁性机械技术公司 | Rotating machinery |
| CN107819385A (en) * | 2016-09-06 | 2018-03-20 | 日本电产三协株式会社 | Motor |
| CN108061006A (en) * | 2016-11-09 | 2018-05-22 | 苏州博拉腾信息科技有限公司 | Wind turbine generator system variable pitch encoder |
| CN107070157A (en) * | 2017-01-18 | 2017-08-18 | 日本电产凯宇汽车电器（江苏）有限公司 | A kind of automobile brake system brushless electric machine |
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| CN109742906A (en) | 2019-05-10 |
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