Magnetic induction encoder

Abstract

The embodiment of the utility model provides a magnetic induction encoder, which comprises a magnetic field generating piece and a magnetic sensor, wherein the magnetic field generating piece is rotatably arranged, and a rotating shaft of the magnetic field generating piece coincides with the central axis of the magnetic field generating piece; the magnetic sensor and the magnetic field generator are oppositely arranged at an interval, and a rotating shaft of the magnetic field generator passes through the center of the magnetic sensor.

Description

Technical Field

[0001] This specification relates to the field of magnetoelectric encoders, and particularly to a magnetic induction encoder. Background Art

[0002] Radios usually achieve the function of tuning stations through encoders, so as to receive radio stations on different FM (frequency modulation) frequency bands. Existing ordinary encoders have fewer gears and insufficient number of pulses output after rotating 360°, resulting in a limited number of radio stations that can be tuned and unable to meet the diverse needs of users.

[0003] Therefore, a magnetic induction encoder is provided, which can detect the change of magnetic field and accurately locate the rotation angle, so as to realize the identification of multiple radio stations and high-precision adjustment under the condition of rotating a small angle. Utility Model Content

[0004] One or more embodiments of this specification provide a magnetic induction encoder, including a magnetic field generating member and a magnetic sensor: the magnetic field generating member is rotatably arranged, and the rotation axis of the magnetic field generating member coincides with the central axis of the magnetic field generating member; the magnetic sensor is arranged opposite to the magnetic field generating member at an interval, and the rotation axis of the magnetic field generating member passes through the center of the magnetic sensor.

[0005] In some embodiments, the magnetic sensor is a Hall sensor.

[0006] In some embodiments, the cross-section of the magnetic field generating member is circular, and the magnetic field generating member is radially magnetized.

[0007] In some embodiments, the distance between the magnetic sensor and the magnetic field generating member is 2-5 mm.

[0008] In some embodiments, the magnetic induction encoder includes an input component, and the input component includes a knob and a transmission component. The knob is fixedly connected to the transmission component, and the transmission component is fixedly connected to the magnetic field generating member.

[0009] In some embodiments, the knob is coaxially arranged with the magnetic field generating member.

[0010] In some embodiments, the transmission component includes a speed reducer and an output transmission shaft. The output transmission shaft is fixed on the speed reducer, and the output transmission shaft is coaxially arranged with the speed reducer.

[0011] In some embodiments, the magnetic field generating member is fixed on the output end of the output transmission shaft away from the speed reducer, or the magnetic field generating member is embedded in the output end of the output transmission shaft away from the speed reducer, or the output transmission shaft is sleeved and fixed outside the magnetic field generating member.

[0012] In some embodiments, the magnetic sensor is configured to: obtain the angular velocity of the knob rotating from the first position to the second position; continuously output all the pulse signals from the first position to the second position in response to the angular velocity being less than a preset threshold; and output the pulse signal of the second position in response to the angular velocity being greater than or equal to the preset threshold.

[0013] In some embodiments, the magnetic induction encoder includes an assisting device, the knob includes a target scale line, and the knob is configured to be rotatable to correspond to any one of a plurality of preset points with the target scale line; when the knob rotates to the third position corresponding to the target scale line, the assisting device assists the knob to rotate until the target scale line of the knob corresponds to the preset point closest to the third position. Description of the Drawings

[0014] This specification will be further described by way of exemplary embodiments, which will be described in detail through the drawings. These embodiments are not restrictive. In these embodiments, the same reference numerals represent the same structures, where:

[0015] Figure 1 is an exemplary structural diagram of a magnetic induction encoder shown in some embodiments of this specification;

[0016] Figure 2 is an exemplary structural schematic diagram of a magnetic field generating member shown in some embodiments of this specification;

[0017] Figure 3 is another exemplary structural diagram of a magnetic induction encoder shown in some embodiments of this specification;

[0018] Figure 4 -a is a schematic diagram of the connection relationship between a magnetic field generating member and an output transmission shaft shown in some embodiments of this specification;

[0019] Figure 4 -b is another schematic diagram of the connection relationship between a magnetic field generating member and an output transmission shaft shown in some embodiments of this specification;

[0020] Figure 4 -c is another schematic diagram of the connection relationship between a magnetic field generating member and an output transmission shaft shown in some embodiments of this specification;

[0021] Figure 5 -a is a schematic diagram of the installation position of an assisting device shown in some embodiments of this specification;

[0022] Figure 5 -b is another schematic diagram of the installation position of an assisting device shown in some embodiments of this specification. Detailed Description of the Embodiments

[0023] To more clearly illustrate the technical solutions of the embodiments of this specification, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some examples or embodiments of this specification. For those of ordinary skill in the art, without creative efforts, this specification can also be applied to other similar scenarios based on these drawings. Unless obvious from the language context or otherwise stated, the same reference numerals in the figures represent the same structure or operation.

[0024] It should be understood that the "system", "device", "unit" and / or "module" used herein is a way to distinguish different components, elements, parts, portions or assemblies at different levels. However, if other words can achieve the same purpose, the said words can be replaced by other expressions.

[0025] As shown in this specification, unless the context clearly indicates an exceptional situation, words such as "a", "an", "one" and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of the components that have been clearly identified, and these components do not constitute an exclusive list. The encoder may also include other components.

[0026] Generally, a common encoder can output 24 pulses in one rotation. The number of gears is small, and the number of pulses output in one rotation is far less than the number of radio stations. The radio may not be able to receive all radio stations. Therefore, a magnetic induction encoder is provided, which can output multiple pulse signals by detecting magnetic field changes. The number of pulses of the magnetic induction encoder in one rotation is much larger than the number of radio stations within the FM band, so accurate tuning can be achieved.

[0027] Figure 1 It is an exemplary structural diagram of a magnetic induction encoder shown according to some embodiments of this specification.

[0028] In some embodiments, as Figure 1 shown, the magnetic induction encoder includes a magnetic field generating member 110 and a magnetic sensor 120.

[0029] The magnetic field generating member 110 is a device for generating a magnetic field. For example, the magnetic field generating member can be an electromagnet, a permanent magnet or other devices that can generate a magnetic field, etc.

[0030] In some embodiments, the magnetic field generating member 110 can be rotatably arranged. The magnetic field generating member 110 can freely rotate around the rotation axis.

[0031] In some embodiments, the rotation axis of the magnetic field generating member 110 coincides with the central axis of the magnetic field generating member 110. The central axis of the magnetic field generating member 110 refers to the geometric center line of the magnetic field generating member 110. Exemplarily, as Figure 1 shown, the rotation axis of the magnetic field generating member 110 coincides with the central axis of the magnetic field generating member as axis D-D.

[0032] Figure 2 is a schematic structural view of an exemplary magnetic field generating member shown according to some embodiments of the present specification.

[0033] In some embodiments, the cross-section of the magnetic field generating member 110 is circular. The cross-section of the magnetic field generating member 110 refers to the cutting plane perpendicular to the rotation axis of the magnetic field generating member 110. Exemplarily, as Figure 2 shown, the magnetic field generating member 110 can be a cylinder. The magnetic field generating member can also be a frustum of a cone, a cone or other regular structures.

[0034] In some embodiments, as Figure 2 shown, the magnetic field generating member is radially magnetized, that is, the S pole and the N pole of the magnetic field generating member are arranged along the radial direction.

[0035] Setting the cross-section of the magnetic field generating member to be circular and radially magnetized can ensure that the magnetic field generated by the magnetic field generating member in the radial direction is uniform. When the magnetic field generating member rotates around the rotation axis, the magnetic pole direction changes, and the generated magnetic field changes uniformly in the radial direction, thereby ensuring that the magnetic field detected by the magnetic sensor changes uniformly.

[0036] The magnetic sensor 120 is a sensor for detecting changes in the magnetic field.

[0037] In some embodiments, the magnetic sensor 120 is a Hall sensor. The Hall sensor can detect changes in the magnetic field through the Hall effect and output a pulse signal.

[0038] The Hall sensor is an integrated sensor for detecting magnetic field changes. In some embodiments, the Hall sensor includes a Hall element and an accessory circuit. When the magnetic field changes, the Hall element in the Hall sensor can form a Hall voltage, and the accessory circuit can convert the Hall voltage into a pulse signal and output it.

[0039] The Hall sensor has high accuracy and sensitivity. In some embodiments, the minimum rotation angle that the Hall sensor can resolve is 0.0878 degrees. When the magnetic sensor 120 rotates one week, the Hall sensor can output at most 4096 pulse signals. Applying the Hall sensor to the magnetic induction encoder can improve the accuracy and sensitivity of the magnetic induction encoder.

[0040] In some embodiments, as Figure 1As shown, the magnetic sensor 120 is disposed opposite to the magnetic field generating member 110 with a gap therebetween, and the rotation axis of the magnetic field generating member 110 passes through the center of the magnetic sensor 120.

[0041] In some embodiments, the distance between the magnetic sensor 120 and the magnetic field generating member 110 is 2 - 5 mm. The distance between the magnetic sensor 120 and the magnetic field generating member 110 refers to the distance between the end of the magnetic sensor 120 close to the magnetic field generating member 110 and the end of the magnetic field generating member 110 close to the magnetic sensor 120. Exemplarily, as Figure 1 shown, the distance a between the magnetic sensor 120 and the magnetic field generating member 110 is 2 - 5 mm.

[0042] In some embodiments, the distance between the magnetic sensor 120 and the magnetic field generating member 110 can be 2 - 3 mm, so that the magnetic field intensity detected by the magnetic sensor 120 is greater, the pulse signal emitted by the magnetic sensor 120 is stronger, thereby improving the sensitivity and measurement accuracy of the sensor. At the same time, the close-range configuration can save equipment and installation space.

[0043] In some embodiments, the distance between the magnetic sensor 120 and the magnetic field generating member 110 can be 4 - 5 mm, increasing the flexibility and adjustability of the encoder installation.

[0044] In some embodiments, the distance between the magnetic sensor 120 and the magnetic field generating member 110 can be 3 - 4 mm. In some embodiments, the distance between the magnetic sensor 120 and the magnetic field generating member 110 can be 2.5 - 4.5 mm. In some embodiments, the distance between the magnetic sensor 120 and the magnetic field generating member 110 can be 3.5 - 4.5 mm. In some embodiments, the distance between the magnetic sensor 120 and the magnetic field generating member 110 can be 2.8 - 4 mm. In some embodiments, the distance between the magnetic sensor 120 and the magnetic field generating member 110 can be 3 - 5 mm.

[0045] By controlling the distance between the magnetic sensor and the magnetic field generating member, the measurement requirements of the magnetic sensor in different scenarios can be met.

[0046] In some embodiments, as Figure 1 shown, the magnetic sensor 120 is mounted on the mounting plate 101. The mounting plate 101 is a device for supporting and connecting the magnetic sensor 120. For example, the mounting plate 101 can be a PCB (Printed Circuit Board). The mounting plate 101 can provide the electric energy required for the operation of the magnetic sensor 120 through an external power supply.

[0047] In some embodiments, the magnetic induction encoder can generate a changing magnetic field through the rotation of the magnetic field generating member 110, and the magnetic sensor 120 can detect the change of the magnetic field, generate a pulse signal and output it.

[0048] In some embodiments, the magnetic sensor 120 can detect the rotation angle of the magnetic field. Different rotation angles generate different pulse signals.

[0049] By using the magnetic field generating component and the magnetic sensor in combination, the magnetic induction encoder can output different pulse signals through the rotational change of the magnetic field, improving the accuracy of the encoder. When applied to devices such as radios, the number of received radio stations can be increased. At the same time, the magnetic field is less affected by environmental factors such as dust, dirt, or light, thereby increasing the applicable scenarios and usage stability of the magnetic induction encoder.

[0050] Figure 3 It is another exemplary structural diagram of the magnetic induction encoder shown according to some embodiments of this specification.

[0051] In some embodiments, as Figure 3 shown, the magnetic induction encoder includes an input component 130.

[0052] The input component 130 is a component for inputting a rotational force to rotate the magnetic field generator 110.

[0053] In some embodiments, as Figure 3 shown, the input component 130 includes a knob 131 and a transmission component 132.

[0054] The knob 131 is an operation button for rotation. In some embodiments, the knob 131 can rotate bidirectionally. The user can drive the rotation of the input component 130 by rotating the knob 131.

[0055] In some embodiments, the knob 131 is coaxially arranged with the magnetic field generating component 110, so as to ensure the synchronous rotation of the knob and the magnetic field generating component, and thus ensure the adjustment accuracy of the pulse signal. Exemplarily, as Figure 3 shown, the knob 131 and the magnetic field generating component 110 are coaxially arranged along the axis D-D.

[0056] The transmission component 132 is a component for transmitting the rotational force of the knob and driving the rotation of the magnetic field generator 110.

[0057] In some embodiments, the knob 131 is fixedly connected to the transmission component 132, and the transmission component 132 is fixedly connected to the magnetic field generating component 110. In some embodiments, the magnetic field generator 110 is arranged at one end of the transmission component 132 close to the magnetic sensor 120.

[0058] By setting the knob and the transmission component, when the user operates the knob to rotate, the magnetic field generating component 110 rotates, so that the magnetic sensor outputs corresponding pulse signals, realizing signal adjustment.

[0059] In some embodiments, as Figure 3As shown, the transmission assembly 132 includes a speed reducer 1321 and an output transmission shaft 1322.

[0060] The speed reducer 1321 is a component for providing resistance to the knob 131. In some embodiments, the speed reducer 1321 is fixedly connected to the knob 131. In some embodiments, the speed reducer 1321 can be made of a metal material. The resistance provided by the speed reducer 1321 can enable the knob 131 to stay at a certain position after each rotation, thereby improving the stability of the magnetic induction encoder adjustment.

[0061] The output transmission shaft 1322 is a transmission structural member for transmitting rotational force. In some embodiments, the output transmission shaft 1322 can be a cylindrical structure.

[0062] In some embodiments, the output transmission shaft 1322 is fixed on the speed reducer 1321. The output transmission shaft 1322 is coaxially arranged with the speed reducer 1321. Exemplarily, as Figure 3 shown, the output transmission shaft 1322 and the speed reducer 1321 are coaxially arranged along the axis D-D.

[0063] Figure 4 -a is a schematic diagram of the connection relationship between the magnetic field generating member and the output transmission shaft shown in some embodiments of this specification. Figure 4 -b is another schematic diagram of the connection relationship between the magnetic field generating member and the output transmission shaft shown in some embodiments of this specification. Figure 4 -c is yet another schematic diagram of the connection relationship between the magnetic field generating member and the output transmission shaft shown in some embodiments of this specification.

[0064] In some embodiments, as Figure 4 shown in -a, the magnetic field generating member 110 is fixed on the output end of the output transmission shaft 1322 away from the speed reducer 1321.

[0065] In some embodiments, as Figure 4 shown in -b, the magnetic field generating member 110 is embedded in the output end of the output transmission shaft 1322 away from the speed reducer 1321.

[0066] In some embodiments, as Figure 4 shown in -c, the output transmission shaft 1322 is sleeved and fixed on the outside of the magnetic field generating member 110.

[0067] Different setting methods can meet the structural requirements of different magnetic induction encoders.

[0068] In some embodiments, the magnetic sensor 120 is configured to: obtain the angular velocity of the knob 131 rotating from the first position to the second position; in response to the angular velocity being less than a preset threshold, continuously output all pulse signals from the first position to the second position; and in response to the angular velocity being greater than or equal to the preset threshold, output the pulse signal of the second position.

[0069] The first position refers to the starting position of the knob before each rotation of the knob. The second position refers to the position where the knob stops after each rotation of the knob.

[0070] For example, the minimum rotation angle that the Hall sensor can distinguish is 0.0878 degrees. When the knob rotates one week starting from the position corresponding to 0°, the Hall sensor can identify 4096 points, and each point corresponds to a pulse signal. The points can be represented by the angle of rotation from the initial position, and the corresponding relationship between the points and the pulse signals can be determined according to a preset table, and the preset table can be considered to be preset according to experience. Exemplarily, when the knob 131 rotates from the first position to the second position and passes through 20 points respectively, if the angular velocity is less than the preset threshold, 20 pulse signals corresponding to the points from the first position to the second position are continuously output; if the angular velocity is greater than or equal to the preset threshold, only the pulse signal corresponding to the point of the second position is output.

[0071] The angular velocity refers to the average angular velocity of the knob 131 rotating from the first position to the second position. In some embodiments, the magnetic sensor 120 can obtain the angular velocity through a processing element on the mounting plate 101. The processing element on the mounting plate 101 can continuously obtain the angular velocity of the change in the magnetic pole direction at multiple moments through the magnetic sensor 120, process the angular velocities at multiple moments, obtain the average value of the angular velocities at multiple moments as the angular velocity of the knob 131 rotating from the first position to the second position, and send it to the magnetic sensor 120. The processing element is an electronic element used to process relevant parameters of the magnetic sensor 120. For example, a microcontroller (MCU) or an embedded processor, etc.

[0072] The preset threshold refers to the critical value of the angular velocity, and the preset threshold can be preset manually according to experience or requirements.

[0073] From the first position to the second position, when the user rotates the knob quickly, it indicates that the user is more likely to want the pulse signal of the second position; when the user rotates the knob slowly, it indicates that the user may want the pulse signals between the first position and the second position. Determining the number of pulse signals output by the magnetic sensor according to the magnitude of the angular velocity can make the magnetic induction encoder more in line with the user's needs.

[0074] In some embodiments, the input component 130 of the magnetic induction encoder can rotate bidirectionally, and the knob 131 can be adjusted bidirectionally. The user can rotate the knob from the first position to the second position, or rotate the knob from the second position to the first position.

[0075] In some embodiments, the magnetic sensor 120 is configured to: obtain the angular velocity of the knob 131 rotating from the second position to the first position; continuously output all pulse signals from the second position to the first position in response to the angular velocity being less than a preset threshold; and output the pulse signal of the first position in response to the angular velocity being greater than or equal to the preset threshold. For more descriptions about the knob rotating from the second position to the first position, it is similar to the foregoing and will not be elaborated here.

[0076] By setting the bidirectionally rotatable input component, more requirements for adjusting pulse signals of users can be met.

[0077] Figure 5 -a is a schematic diagram of the installation position of the boosting device shown in some embodiments of this specification. Figure 5 -b is another schematic diagram of the installation position of the boosting device shown in some embodiments of this specification.

[0078] In some embodiments, as Figure 5 shown in -a, the magnetic induction encoder includes a boosting device 140, and the knob 131 includes a target scale line. The target scale line is an identification line indicating the target position of the knob 131. The target scale line is located on the surface of the knob 131, and when the knob 131 rotates, the target scale line rotates synchronously.

[0079] The boosting device 140 is a device that can assist the knob to rotate. For example, the boosting device 140 can be configured as a motor or the like. In some embodiments, as Figure 5 shown in -a, the boosting device 140 can be installed between the speed reducer 1321 and the output transmission shaft 1322. In some embodiments, as Figure 5 shown in -b, the boosting device 140 can be embedded and installed at one end of the output transmission shaft 1322 close to the speed reducer 1321. In some embodiments, the boosting device 140 can be electrically connected to the mounting plate 101, and the processing element on the mounting plate 101 can control the boosting device 140.

[0080] In some embodiments, the knob 131 is configured to be rotatable to make the target scale line correspond to any one of a plurality of preset points.

[0081] The preset points are indication points around the knob representing different pulse signals. The preset points are located around the knob 131 and are stationary. The number of preset points can be set in advance. In some embodiments, when the knob 131 is rotated to make the target scale line correspond to different preset points, the magnetic sensor 120 outputs pulse signals corresponding to different preset points.

[0082] The number of preset positions is less than or equal to the maximum number of positions that the magnetic sensor can identify in one rotation.

[0083] In some embodiments, when the user rotates the knob, there may be a situation where the position where the knob stops does not correspond to the preset position. At this time, the pulse signal output by the sensor is inconsistent with the target signal that the user hopes to obtain. By setting the assisting device 140, the situation where the position where the knob stops does not correspond to the preset position can be improved.

[0084] In some embodiments, when the knob 131 rotates to the third position corresponding to the target scale line, the assisting device 140 can assist the rotation of the knob 131 (for example, drive the knob 131 to rotate through a motor) until the target scale line of the knob 131 corresponds to the preset position closest to the third position. The third position refers to the position corresponding to the target scale line when the knob 131 stops rotating, and the minimum distance between the third position and the preset position is greater than the preset distance threshold.

[0085] By setting the assisting device and the preset positions, the error of the user's channel tuning is improved to a certain extent, and the pulse signal output by the magnetic induction encoder can better meet the needs of the user's channel tuning.

[0086] It should be noted that the above description of the magnetic induction encoder and its components is only for convenience of description, and does not limit this specification to the scope of the examples given. It can be understood that for those skilled in the art, after understanding the principle of the system, various components may be arbitrarily combined without departing from this principle.

[0087] The disclosure is only for example and does not constitute a limitation of this specification. Although not explicitly stated here, those skilled in the art may make various modifications, improvements, and corrections to this specification. Such modifications, improvements, and corrections are suggested in this specification, so such modifications, improvements, and corrections still fall within the spirit and scope of the exemplary embodiments of this specification.

[0088] At the same time, this specification uses specific terms to describe the embodiments of this specification. Such as "one embodiment", "an embodiment", and / or "some embodiments" mean a certain feature, structure, or characteristic related to at least one embodiment of this specification. Therefore, it should be emphasized and noted that the "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more at different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this specification can be appropriately combined.

[0089] Similarly, it should be noted that, in order to simplify the presentation disclosed in this specification and thus assist in the understanding of one or more embodiments, in the foregoing description of the embodiments of this specification, sometimes multiple features are incorporated into one embodiment, drawing, or description thereof. In fact, the features of an embodiment are fewer than all the features of the single embodiment disclosed above.

[0090] Finally, it should be understood that the embodiments described in this specification are only used to illustrate the principles of the embodiments of this specification. Other variations may also fall within the scope of this specification. Therefore, by way of example and not limitation, alternative configurations of the embodiments of this specification may be regarded as consistent with the teachings of this specification. Accordingly, the embodiments of this specification are not limited to the embodiments explicitly introduced and described in this specification.

Claims

1. A magnetic induction encoder, comprising a magnetic field generating member and a magnetic sensor: The magnetic field generating member is rotatably arranged, and the rotation axis of the magnetic field generating member coincides with the central axis of the magnetic field generating member; The magnetic sensor is arranged opposite to the magnetic field generating member at an interval, and the rotation axis of the magnetic field generating member passes through the center of the magnetic sensor; The magnetic induction encoder further comprises an input assembly, the input assembly comprises a knob and a transmission assembly, the knob is fixedly connected to the transmission assembly, the transmission assembly is fixedly connected to the magnetic field generating member, and the knob is coaxially arranged with the magnetic field generating member; The transmission assembly comprises a reducer and an output transmission shaft, the output transmission shaft is fixed on the reducer, and the output transmission shaft is coaxially arranged with the reducer.

2. The magnetic induction encoder according to claim 1, wherein The magnetic sensor is a Hall sensor.

3. The magnetic induction encoder according to claim 1, wherein The cross-section of the magnetic field generating member is circular, and the magnetic field generating member is radially magnetized.

4. The magnetic induction encoder according to claim 1, wherein The distance between the magnetic sensor and the magnetic field generating member is 2-5 mm.

5. The magnetic induction encoder according to claim 1, wherein The magnetic field generating member is fixed on the output end of the output transmission shaft away from the reducer, or the magnetic field generating member is embedded in the output end of the output transmission shaft away from the reducer, or the output transmission shaft is sleeved and fixed outside the magnetic field generating member.

6. The magnetic induction encoder according to claim 1, wherein The magnetic sensor is configured to: Obtain the angular velocity of the knob rotating from the first position to the second position, and the angular velocity is the average angular velocity of the knob rotating from the first position to the second position; In response to the angular velocity of the knob being less than a preset threshold, continuously output all pulse signals from the first position to the second position; In response to the angular velocity of the knob being greater than or equal to the preset threshold, output the pulse signal of the second position.

7. The magnetic induction encoder according to claim 1, wherein The magnetic induction encoder comprises an assisting device, the knob comprises a target scale line, and the knob is configured to be rotatable to correspond to any one of a plurality of preset points with the target scale line; When the knob rotates to the third position corresponding to the target scale line, the assisting device assists the knob to rotate until the target scale line corresponds to the preset point closest to the third position.

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