Driving device and stirring equipment

Abstract

The utility model discloses a driving device and stirring equipment, the driving device comprises a static part, a rotor assembly, a magnetic ring module and a detection module, and the static part comprises a stator assembly; the rotor assembly is coupled with the stator assembly so as to rotate relative to the stator assembly, and the rotor assembly comprises a rotating shaft; one of the magnetic ring module and the detection module is arranged on the static part, the other one is arranged on the rotor assembly, and the magnetic ring module comprises a magnetic ring; the detection module comprises a circuit board and at least two Hall elements, the at least two Hall elements are arranged on the circuit board at intervals in the circumferential direction of the rotating shaft, and each Hall element is magnetically matched with the magnetic ring to detect the angle of the rotating shaft; according to the driving device, the accurate position of the mover assembly is directly judged through the signal values obtained by the Hall elements, the detection process is simplified, the production cost is reduced, the obtained position result is more accurate, and then accurate control over the driving device is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to stirring equipment technical field, specifically, relate to a drive arrangement and stirring equipment. BACKGROUND

[0002] In the related art, a switch Hall sensor or an absolute position pulse encoder is usually used to detect the position of a mover assembly, wherein the switch Hall sensor has low angle resolution and cannot accurately position the mover assembly, and the absolute position pulse encoder is expensive and increases the production cost of the drive arrangement, so there is room for improvement. SUMMARY

[0003] The utility model aims at at least in a certain extent solves one of preceding technical problems in the prior art. For this reason, the utility model provides a drive arrangement, the drive arrangement directly judges the accurate position of a mover assembly by using the signal value obtained by at least two Hall elements, simplifies the detection process, reduces the production cost, makes the obtained position result more accurate, and further realizes accurate control of the drive arrangement.

[0004] The utility model further provides a stirring equipment with the drive arrangement.

[0005] The drive arrangement according to the embodiments of the utility model comprises: a stationary component, wherein the stationary component comprises a stator assembly;

[0006] a mover assembly, wherein the mover assembly is coupled with the stator assembly to rotate relative to the stator assembly, and the mover assembly comprises a rotating shaft;

[0007] a magnetic ring module and a detection module, wherein one of the magnetic ring module and the detection module is arranged on the stationary component, and the other is arranged on the mover assembly, and the magnetic ring module comprises a magnetic ring;

[0008] the detection module comprises a circuit board and at least two Hall elements, the at least two Hall elements are arranged on the circuit board in a spaced apart manner along the circumference of the rotating shaft, and each Hall element is magnetically matched with the magnetic ring to detect the angle of the rotating shaft.

[0009] The drive arrangement according to the embodiments of the utility model directly judges the accurate position of a mover assembly by using the signal value obtained by at least two Hall elements, simplifies the detection process, reduces the production cost, makes the obtained position result more accurate, and further realizes accurate control of the drive arrangement.

[0010] In addition, the drive arrangement according to the embodiments of the utility model can further have the following additional technical features:

[0011] According to some embodiments of the present application, the Hall element is two.

[0012] According to some embodiments of the present application, on the same cross section of the rotating shaft, the angle between the line connecting the center of one Hall element and the center of the rotating shaft and the line connecting the center of the other Hall element and the center of the rotating shaft is θ, the number of pole pairs of the magnetic ring is k, θ=(90°+180°*N) / k, (N is an integer; 0°<θ<180°).

[0013] According to some embodiments of the present application, the number of pole pairs of the magnetic ring is 1.

[0014] According to some embodiments of the present application, the magnetic ring is sleeved on the rotating shaft.

[0015] According to some embodiments of the present application, the magnetic ring module further comprises a bushing, the bushing is a plastic part, the magnetic ring is fixed to the bushing, and the bushing is fixed to the rotating shaft.

[0016] According to some embodiments of the present application, in the axial direction of the rotating shaft, the magnetic ring is located on the side of the bushing facing the Hall element.

[0017] According to some embodiments of the present application, the bushing is provided with a mounting groove, and the magnetic ring is placed in the mounting groove.

[0018] According to some embodiments of the present application, the magnetic ring comprises a center ring and a plurality of bosses, the plurality of bosses are connected with the center ring and protrude radially outward along the center ring;

[0019] The mounting groove comprises a main body portion and a plurality of branch grooves, the plurality of branch grooves are in communication with the main body portion, the center ring is placed in the main body portion, and the plurality of bosses are placed one-to-one in the branch grooves.

[0020] According to some embodiments of the present application, on the same cross section of the rotating shaft, in the radial direction of the center ring, the radial dimension of each boss is C, the outer diameter of the bushing is E, and the boss satisfies: E / 3≤C<E.

[0021] According to some embodiments of the present application, the diameter of the part of the rotating shaft matched with the bushing is A, and the inner diameter of the magnetic ring is B, wherein A<B.

[0022] According to some embodiments of the present application, on the same cross section of the rotating shaft, define two circles passing through the center of the rotating shaft as a first circle and a second circle, the plurality of Hall elements are located between the first circle and the second circle, the first circle passes through the inner peripheral wall of the Hall element and the second circle passes through the outer peripheral wall of the Hall element; the diameter of the first circle is D1, the diameter of the second circle is D2, and the maximum radial length of the magnetic ring is D, wherein the magnetic ring satisfies D1≤D≤D2.

[0023] According to some embodiments of the present application, in the axial direction of the rotating shaft, the axial spacing between the magnetic ring and the Hall element is H, wherein H∈[1,4]mm.

[0024] According to some embodiments of the present application, H∈[1.7,2.2]mm.

[0025] According to another aspect of the stirring equipment of the present application, the driving device is as described above, and the rotating shaft is connected with the stirring member. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic view of the driving device according to the embodiments of the present application;

[0027] Figure 2 is a structural schematic view of the detection module according to the embodiments of the present application;

[0028] Figure 3 is a structural schematic view of the magnetic ring module and the Hall element according to the embodiments of the present application;

[0029] Figure 4 is a structural schematic view of the magnetic ring module and the rotating shaft according to the embodiments of the present application;

[0030] Figure 5 is a structural schematic view of the magnetic ring module according to the embodiments of the present application;

[0031] Figure 6 is a relationship diagram between the output electric signal of the two Hall elements and the angle of rotation of the rotor assembly when the number of pole pairs of the magnetic ring is 2;

[0032] Figure 7 is a magnetic field density relationship diagram of the magnetic ring module and the Hall element at different spacings at different temperatures.

[0033] REFERENCE NUMERALS:

[0034] Driving device 100, stationary component 1, rotor assembly 2, rotating shaft 3, magnetic ring module 4, magnetic ring 41, center ring 411, boss 412, bushing 42, detection module 5, circuit board 51, Hall element 52. DETAILED DESCRIPTION

[0035] The embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0036] In the description of the present application, it is understood that the terms "center", "longitudinal", "transverse", "vertical", "width", "thickness", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0037] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0038] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or can communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication or interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the present application, unless otherwise specifically defined and limited, the first feature "above" or "below" the second feature can include the first and second features in direct contact, or the first and second features not in direct contact but in contact through another feature between them. Moreover, the first feature "above", "above" and "above" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature.

[0040] The following refers to Figures 1-7 The driving device 100 according to the embodiments of the present application is described.

[0041] The driving device 100 according to the embodiment of the utility model can include: static part 1, rotor assembly 2, magnetic ring module 4 and detection module 5.

[0042] Static part 1 includes stator assembly and shell, the shell includes end cover, the rotor assembly 2 of driving device 100 is coupled with stator assembly to rotate relative to stator assembly and static part 1, during operation, static part 1 remains stationary, rotor assembly 2 rotates relative to stator assembly, namely static part 1, rotor assembly 2 includes rotating shaft 3, rotating shaft 3 is located at the axis position of rotor assembly 2, and driving force can be outputted outward during rotation.

[0043] The driving device 100 of traditional stirring equipment, namely brushless motor, needs to accurately position the position of rotor assembly 2, and the position of rotor assembly 2 is positioned by detection module 5 and magnetic ring module 4 respectively arranged on static part 1 and rotor assembly 2, wherein magnetic ring module 4 provides corresponding magnetic field environment for detection module 5, during rotation of one of magnetic ring module 4 or detection module 5 along with rotor assembly 2, detection module 5 detects the change of magnetic field environment and outputs the acquired magnetic field information as corresponding electric signal, and the position of rotor assembly 2 can be accurately positioned according to the signal output by detection module 5, thereby realizing accurate control of driving device 100.

[0044] In the related art, switch Hall sensor or absolute position pulse encoder is generally used to detect the position of rotor assembly 2, wherein the angle resolution of switch Hall sensor is low, and rotor assembly 2 cannot be accurately positioned, and the absolute position pulse encoder is expensive, which increases the production cost of driving device 100.

[0045] Therefore, a detection module 5 for accurately positioning the position of rotor assembly 2 by linear Hall sensor is designed, linear Hall has the characteristics of outputting different voltages according to the size of contact magnetic field, wherein the greater the magnetic field, the greater the output voltage value, and the smaller the magnetic field, the smaller the output voltage value, linear Hall sensor is low in price and accurate in acquired position information, but the voltage signal generated by linear Hall under the magnetic field generated by rotating magnetic ring module 4 is formed into a sine wave signal or a cosine wave signal, and the same voltage signal value in a signal period corresponds to two different angle values, which needs to be further processed to obtain accurate position information of rotor assembly 2.

[0046] To this end, in the embodiment of the utility model, the detection module 5 of at least two Hall elements 52 composed of linear Hall sensors is arranged along the circumference of the rotating shaft 3 to detect the angle of the rotating shaft 3, so that the accurate position information of the mover assembly 2 is obtained, and thus the voltage signal values obtained by the at least two Hall elements 52 can be used to determine the accurate position of the mover assembly 2, the determination method is convenient, the position detection process of the mover assembly 2 is simplified, the obtained position result of the mover assembly 2 is more accurate, and thus the accurate control of the driving device 100 is realized.

[0047] One of the magnetic ring module 4 and the detection module 5 is arranged on the stationary part 1, and the other is arranged on the mover assembly 2. Specifically, the magnetic ring module 4 includes a magnetic ring 41, the magnetic ring module 4 includes the magnetic ring 41, the magnetic ring 41 can generate a magnetic field, and the magnetic ring 41 rotates synchronously during the rotation of the rotating shaft 3.

[0048] The detection module 5 includes a circuit board 51 and at least two Hall elements 52, each Hall element 52 is magnetically matched with the magnetic ring 41 to detect the angle of the rotating shaft 3, and the Hall element 52 is a linear Hall sensor.

[0049] Specifically, the distance change between the magnetic ring 41 and the Hall element 52 during rotation causes the periodic change of the magnetic field around the Hall element 52, and further causes the Hall element 52 to output different voltage signal values when the magnetic ring 41 is located at different positions and different angles, different voltage signal values reflect the position information of the magnetic ring 41, the magnetic ring module 4 is sleeved on the rotating shaft 3, therefore the voltage signal value information also reflects the angle of the rotating shaft 3, and further reflects the position information of the mover assembly 2.

[0050] The circuit board 51 provides a mounting position for the electronic elements of the detection module 5, so that it is integrated with the connection, the circuit board 51 is integrally provided with at least two Hall elements 52, the at least two Hall elements 52 are arranged on the circuit board 51 along the circumference of the rotating shaft 3, and are magnetically matched with the magnetic ring 41 at different positions to detect the angle of the rotating shaft 3, since the at least two Hall elements 52 are arranged along the circumference of the rotating shaft 3, during the rotation of the rotating shaft 3, the voltage signal image obtained by any one of the at least two Hall elements 52 is the same.

[0051] Since there is an angle difference between the at least two Hall elements 52, when the angle of the rotating shaft 3 is the first angle, the voltage signal values obtained by the at least two Hall elements 52 are different, the voltage signals obtained by the at least two Hall elements 52 form the same sine wave signal or cosine wave signal, and the same signal value in a signal period corresponds to two different angle values, the two angle information corresponding to the signal value can be compared with the angle values corresponding to the voltage signal values obtained by the other Hall elements 52 in the period, until the unique position information value is found.

[0052] When the angle of the rotating shaft 3 is the first angle, the voltage signal value obtained by one of the Hall elements 52 is the first voltage signal value, and the voltage signal value obtained by the other Hall element 52 is the second voltage signal value, the first voltage signal value corresponds to the first angle and the second angle, and the second voltage signal value corresponds to the first angle and the third angle, and the angle of the rotating shaft 3 at the first angle can be obtained according to the first voltage signal value and the second voltage signal value output by the two Hall elements 52.

[0053] According to the driving device 100 of the embodiment of the utility model, the driving device 100 directly judges the accurate position of the rotor assembly 2 by the signal values obtained by the at least two Hall elements 52, simplifies the detection process, reduces the production cost, makes the obtained position result more accurate, and further realizes the accurate control of the driving device 100.

[0054] Referring to Figure 2 The voltage signal value obtained by one of the two Hall elements 52 corresponds to two angle information in a period, and the voltage signal value obtained by the other Hall element 52 corresponds to two angle value information in a period, and the accurate angle of the rotating shaft 3 in a period can be obtained by comparing the two angle information with the two angle value information, the position information of the rotor assembly 2 is accurately obtained, and the production cost is reduced.

[0055] The number of signal periods corresponding to one rotation of the rotor assembly 2 is related to the pole pair number of the magnetic ring 41, when the pole pair number of the magnetic ring 41 is 1, one rotation of the rotor assembly 2 corresponds to one signal period, that is, 360° rotation of the rotor assembly 2 corresponds to one signal period; when the pole pair number is 2, one rotation of the rotor assembly 2 corresponds to two signal periods, that is, 180° rotation of the rotor assembly 2 corresponds to one signal period; when the pole pair number is 3, one rotation of the rotor assembly 2 corresponds to three signal periods, that is, 120° rotation of the rotor assembly 2 corresponds to one signal period; when the pole pair number is 4, one rotation of the rotor assembly 2 corresponds to four signal periods, that is, 90° rotation of the rotor assembly 2 corresponds to one signal period.

[0056] The angle between the line connecting the center of one of the Hall elements 52 with the center of the rotating shaft 3 and the line connecting the center of the other Hall element 52 with the center of the rotating shaft 3 is θ on the same cross section of the rotating shaft 3.

[0057] When θ=(180°*N) / k, the voltage signal value obtained by one of the Hall elements 52 is a first voltage signal value, and the voltage signal value obtained by the other Hall element 52 is a second voltage signal value when the angle of the rotating shaft 3 is a first angle, and the two angle information corresponding to the first voltage signal value and the second voltage signal value are completely the same, which causes that the accurate angle of the rotating shaft 3 cannot be determined by comparison.

[0058] Therefore, the positional relationship of the two Hall elements 52 should satisfy θ≠(180°*N) / k (N is an integer; 0°<θ<180°), so that the case that the two angle values corresponding to the signal values obtained by the two Hall elements 52 are completely the same does not occur, and the angle of the rotating shaft 3 can be determined accurately by comparison of the voltage signal values obtained by the two Hall elements 52.

[0059] In some embodiments, referring to Figure 6 The angle between the line connecting the center of one of the Hall elements 52 with the center of the rotating shaft 3 and the line connecting the center of the other Hall element 52 with the center of the rotating shaft 3 is θ on the same cross section of the rotating shaft 3, the number of pole pairs of the magnetic ring 41 is k, and θ=(90°+180°*N) / k (N is an integer; 0°<θ<180°).

[0060] At this time, the angle value of the rotating shaft 3 is taken as the horizontal coordinate, and the voltage value information output by the Hall element 52 is taken as the vertical coordinate, the images obtained by the two Hall elements 52 in one period are sine image and cosine image respectively, and the current angle can be accurately calculated by using the trigonometric function relationship between sine and cosine and sine and cosine, which is more conducive to the acquisition of the angle value of the rotating shaft 3.

[0061] According to some embodiments of the present application, the number of pole pairs of the magnetic ring 41 is 1, and one signal period corresponds to one rotation of the rotor assembly 2, that is, one signal period corresponds to 360° rotation of the rotor assembly 2, which is more conducive to the detection of the angle of the rotating shaft 3.

[0062] In some embodiments, the magnetic ring module 4 is arranged on the rotor assembly 2 and the detection module 5 is arranged on the stationary component 1 to improve the reliability of the detection module 5. The magnetic ring module 4 is sleeved on the rotating shaft 3, and can rotate synchronously with the rotating shaft 3. The detection module 5 is arranged on the stationary component 1, which remains stationary during the operation of the drive device 100. The detection module 5 arranged on the stationary component 1 also remains stationary. The magnetic ring module 4 sleeved on the rotating shaft 3 rotates relative to the stationary component 1 and also rotates relative to the detection module 5. The rotation of the magnetic ring 41 causes the magnetic field at the detection module 5 to change periodically, and the detection module 5 can detect this change and transmit the position information of the rotating shaft 3 to the outside in the form of an electrical signal.

[0063] In other embodiments, the Hall element 52 can be more than two, and the distance between adjacent two Hall elements 52 is different, so that the detection module 5 is more versatile and can be applied to various drive devices 100 with different numbers of pole pairs of the magnetic ring 41. For example, in the same cross section of the rotating shaft 3, the angle between the line connecting the center of one Hall element 52 with the center of the rotating shaft 3 and the line connecting the center of another Hall element 52 with the center of the rotating shaft 3 is 90°, and the angle between the line connecting the center of the other Hall element 52 with the center of the rotating shaft 3 and the line connecting the center of the other Hall element 52 with the center of the rotating shaft 3 is 60°.

[0064] As shown in Figure 1 , Figure 4 and Figure 5 , the magnetic ring module 4 includes a sleeve 42 and a magnetic ring 41. The sleeve 42 is a plastic part, and the magnetic ring 41 is fixed to the sleeve 42. The sleeve 42 is fixed to the rotating shaft 3, that is, the magnetic ring 41 can be fixed to the rotating shaft 3 through the sleeve 42, which ensures the stability of the fixation of the magnetic ring 41 while reducing the amount of material used for the magnetic ring 41. The use of the plastic sleeve 42 can achieve the lightweight of the drive device 100, reduce production costs, and avoid damage to the rotating shaft 3 during the cooperation of the magnetic ring module 4 and the rotating shaft 3.

[0065] Referring to Figure 1 and Figure 4 , in the axial direction of the rotating shaft 3, the magnetic ring 41 is located on the side of the sleeve 42 facing the Hall element 52, so as to avoid the sleeve 42 causing a change in the magnetic field between the Hall element 52 and the magnetic ring 41, resulting in inaccurate angle values obtained by the Hall element 52 and affecting the accurate control of the drive device 100.

[0066] Referring to Figure 4 and Figure 5The sleeve 42 is provided with a mounting groove, the magnetic ring 41 is placed in the mounting groove, and the mounting groove provides a mounting space for the mounting of the magnetic ring 41, so that the magnetic ring 41 can be stably embedded in the sleeve 42, and the magnetic ring 41 and the sleeve 42 do not occupy a longer space in the axial direction of the rotating shaft 3, thereby affecting the size of the driving device 100.

[0067] The connection process of the magnetic ring 41 and the sleeve 42 can be various, for example, the magnetic ring 41 is injection molded with the sleeve 42 formed as a plastic part, the process of injection molding the magnetic ring 41 and the sleeve 42 is relatively complex, and the production cost is high; or the magnetic ring 41 and the sleeve 42 are bonded by glue, and the bonding mode has poor stability, and the magnetic ring 41 has a risk of falling off.

[0068] Therefore, in the embodiment of the utility model, a magnetic ring 41 is designed to include a center ring 411 and a plurality of bosses 412, the number of the bosses 412 of the magnetic ring 41 is even, the plurality of bosses 412 are connected with the center ring 411 and protrude radially outward from the center ring 411, the mounting groove includes a main body part and a plurality of branch grooves, the plurality of branch grooves are communicated with the main body part, the center ring 411 is placed in the main body part, and the plurality of bosses 412 are placed in the branch grooves one by one, so that the magnetic ring 41 and the sleeve 42 are fixedly connected through the interference fit of the bosses 412 and the branch grooves, the process is simple, the production cost is reduced, the connection stability between the sleeve 42 and the magnetic ring 41 is high, and the risk of the magnetic ring 41 falling off is reduced.

[0069] The radial dimension of the boss 412 determines the structural strength of the magnetic ring 41, when the width of the boss 412 structure is small, the boss 412 structure with low strength is prone to breakage during the interference fit of the boss 412 and the branch groove, and the production cost is affected.

[0070] Therefore, on the same cross section of the rotating shaft 3, the radial dimension of each boss 412 is C in the radial direction of the center ring 411, the outer diameter of the sleeve 42 is E, and the boss 412 satisfies E / 3≤C<E, by limiting the radial dimension of the boss 412 to be greater than one third of the outer diameter of the sleeve 42, the strength of the root of each boss 412 can be ensured, and the root of the boss 412 is prevented from breaking during the fit of the sleeve 42 and the boss 412.

[0071] Referring to Figure 4 The diameter of the part of the rotating shaft 3 matched with the sleeve 42 is A, and the inner diameter of the magnetic ring 41 is B, wherein A<B, so as to avoid that the thickness of the part structure between the magnetic ring 41 and the rotating shaft 3 is too thin, ensure the strength of the part structure between the magnetic ring 41 and the rotating shaft 3, and avoid that the sleeve 42 is deformed after the magnetic ring 41 is assembled, so that the magnetic ring 41 is loose.

[0072] The width of the flat section of the rotating shaft 3 is F, where F < A, to ensure that the rotating shaft 3 has the required flat section and to ensure that the rotating shaft 3 limits the circumferential movement of the magnetic ring module 4.

[0073] like Figure 2 As shown, on the same cross-section of the rotating shaft 3, two circles passing through the center of the rotating shaft 3 are defined as the first circle and the second circle. At least two Hall elements 52 are located between the first circle and the second circle. The first circle passes through the inner peripheral wall of the Hall element 52, and the second circle passes through the outer peripheral wall of the Hall element 52. The diameter of the first circle is D1, the diameter of the second circle is D2, and the maximum radial length of the magnetic ring 41 is D. When D < D1, the Hall element 52 cannot be stably triggered. When D > D2, the volume of the magnetic ring 41 is too large, resulting in waste of materials and costs. The magnetic ring 41 satisfies D1 ≤ D ≤ D2. Therefore, while meeting the triggering magnetic field required by the Hall element 52, the waste of material in the magnetic ring 41 can be avoided.

[0074] like Figure 3 As shown, the axial distance between the magnetic ring 41 and the Hall element 52 along the axis of the rotating shaft 3 is H, where H∈[1,4]mm.

[0075] According to the datasheet, the optimal triggering magnetic field range for Hall element 52 is 30mT-40mT, and the operating temperature range of magnetic ring 41 is between -40℃ and 120℃. In order to ensure that Hall element 52 can be stably triggered within the operating temperature range, the axial distance between magnetic ring 41 and Hall element 52 needs to be controlled within a certain range.

[0076] Reference Figure 7 , Figure 7 The magnetic field density is determined under different temperature conditions and axial spacing conditions between the magnetic ring 41 and the Hall element 52. When the axial spacing between the magnetic ring 41 and the Hall element 52 is limited to 1mm-4mm, the triggering magnetic field range is 20mT-45mT, which can ensure that the Hall element 52 can be stably triggered within the operating temperature range.

[0077] Furthermore, preferably, when the axial distance between the magnetic ring 41 and the Hall element 52 is limited to between 1.7mm and 2.2mm, the triggering magnetic field range is between 30mT and 40mT, which can further ensure that the Hall element 52 can be stably triggered within the operating temperature range.

[0078] A specific embodiment of the drive device 100 of this utility model is described below with reference to the illustrations.

[0079] The drive unit 100 includes: a stationary component 1, a moving part assembly 2, a magnetic ring module 4, and a detection module 5.

[0080] The static component 1 comprises a stator assembly, the mover assembly 2 of the driving device 100 is coupled with the stator assembly of the static component 1 to enable the mover assembly 2 to rotate relative to the stator assembly of the static component 1, in the operation process, the static component 1 remains static, the mover assembly 2 rotates relative to the static component 1, the mover assembly 2 comprises a rotating shaft 3, the rotating shaft 3 is located at the axial position of the mover assembly 2, and the driving force can be outputted outward in the rotating process.

[0081] The magnetic ring module 4 is sleeved on the rotating shaft 3 and comprises a magnetic ring 41, the magnetic ring module 4 is sleeved on the rotating shaft 3 and can rotate synchronously with the rotating shaft 3, the magnetic ring module 4 comprises the magnetic ring 41, the magnetic ring 41 can generate a magnetic field, and the magnetic ring 41 rotates synchronously with the rotating shaft 3 in the rotating process of the magnetic ring module 4.

[0082] The detection module 5 is arranged on the static component 1, in the operation process of the driving device 100, the static component 1 remains static, the detection module 5 arranged on the static component 1 also remains static, the magnetic ring module 4 sleeved on the rotating shaft 3 rotates relative to the static component 1 and also rotates relative to the detection module 5, the magnetic ring 41 rotates to cause the magnetic field at the detection module 5 to periodically change, and the detection module 5 can detect the change and transmit the position information of the rotating shaft 3 to the outside in the form of an electric signal.

[0083] The detection module 5 comprises a circuit board 51 and two Hall elements 52, the two Hall elements 52 are respectively magnetically matched with the magnetic ring 41 to detect the angle of the rotating shaft 3, and the Hall element 52 is a linear Hall sensor. The distance between the magnetic ring 41 and the Hall element 52 changes in the rotating process, so that the magnetic field around the Hall element 52 periodically changes, and then the Hall element 52 outputs different voltage signal values when the magnetic ring 41 is located at different positions and different angles, the different voltage signal values reflect the position information of the magnetic ring 41, the magnetic ring module 4 is sleeved on the rotating shaft 3, so the voltage signal value information also reflects the angle of the rotating shaft 3, and then reflects the position information of the mover assembly 2.

[0084] The circuit board 51 provides mounting positions for electronic elements of the detection module 5, and enables the electronic elements to be connected and integrated, and the two Hall elements 52 are integrally arranged on the circuit board 51 and are arranged at intervals in the circumferential direction of the rotating shaft 3, the voltage signal images obtained by the two Hall elements 52 are the same in the rotating process of the rotating shaft 3.

[0085] The number of pole pairs of the magnetic ring 41 is 1, one signal period corresponds to one rotation of the mover assembly 2, that is, one signal period corresponds to 360° of the rotation of the mover assembly 2, and the angle between the line connecting the center position of one Hall element 52 with the center of the rotating shaft 3 and the line connecting the center position of the other Hall element 52 with the center of the rotating shaft 3 is 90° on the same cross section of the rotating shaft 3.

[0086] At this time, the angle value of the rotating shaft 3 is taken as the horizontal coordinate, and the voltage value information output by the Hall element 52 is taken as the vertical coordinate. The images detected by the two Hall elements 52 in one period are respectively a sine image and a cosine image. By using the trigonometric function relationship between the sine and cosine, the current angle can be accurately calculated, which is more conducive to obtaining the angle value of the rotating shaft 3.

[0087] When the angle of the rotating shaft 3 is the first angle a, the voltage signal value obtained by one of the Hall elements 52 is the first voltage signal value sin a, and the voltage signal value obtained by the other Hall element 52 is the second voltage signal value cos a. The first voltage signal value corresponds to the first angle a and the second angle 180°-a, and the second voltage signal value corresponds to the first angle a and the third angle 360°-a. According to the first voltage signal value and the second voltage signal value output by the two Hall elements 52, the angle of the rotating shaft 3 can be obtained as the first angle a.

[0088] The magnetic ring module 4 includes a bushing 42 and a magnetic ring 41. The bushing 42 is a plastic part, and the magnetic ring 41 is fixed to the bushing 42. The bushing 42 is fixed to the rotating shaft 3. In the axial direction of the rotating shaft 3, the magnetic ring 41 is located on the side of the bushing 42 facing the Hall element 52, so as to avoid the bushing 42 causing a change in the magnetic field between the Hall element 52 and the magnetic ring 41, resulting in inaccurate angle values obtained by the Hall element 52, and affecting the accurate control of the driving device 100.

[0089] The bushing 42 is provided with a mounting groove, and the magnetic ring 41 is placed in the mounting groove. The magnetic ring 41 includes a center ring 411 and a plurality of bosses 412. The number of the bosses 412 is even. The bosses 412 are connected to the center ring 411 and protrude radially outward from the center ring 411. The mounting groove includes a main body portion and a plurality of branch grooves. The plurality of branch grooves are in communication with the main body portion. The center ring 411 is placed in the main body portion. The plurality of bosses 412 are placed one by one in the branch grooves. In this way, the bosses 412 and the branch grooves are fixedly connected by interference fit, which is simple in process and reduces production cost. The connection between the bushing 42 and the magnetic ring 41 is stable, and the risk of the magnetic ring 41 falling off is reduced.

[0090] In the radial direction of the center ring 411, the radial dimension of each boss 412 is C, and the outer diameter of the bushing 42 is E. The boss 412 satisfies E / 3≤C<E. By limiting the radial dimension of the boss 412 to be greater than one-third of the outer diameter of the bushing 42, the strength of the root of each boss 412 can be ensured, and the root of the boss 412 is prevented from being broken during the cooperation between the bushing 42 and the boss 412.

[0091] The diameter of the portion of the rotating shaft 3 matched with the bushing 42 is A, and the inner diameter of the magnetic ring 41 is B, wherein A < B, so as to avoid the thickness of the portion structure between the magnetic ring 41 and the rotating shaft 3 being too thin, ensure the strength of the portion structure between the magnetic ring 41 and the rotating shaft 3, and avoid the bushing 42 deforming after the magnetic ring 41 is assembled to cause the magnetic ring 41 to be loose.

[0092] The flat position width of the rotating shaft 3 is F, and F < A, so as to ensure the rotating shaft 3 having the flat position, and ensure the rotating shaft 3 being limited in the circumferential direction of the magnetic ring module 4.

[0093] There are two concentric circles with the centers located at the center of the rotating shaft 3 and passing through the inner circumferential wall of the Hall element 52 and the outer circumferential wall of the Hall element 52 respectively, and the maximum radial length of the magnetic ring 41 is not less than the diameter of the small circle in the concentric circles and not more than the diameter of the large circle in the concentric circles, so as to avoid the waste of the material of the magnetic ring 41 under the premise of meeting the required triggering magnetic field of the Hall element 52.

[0094] In the axial direction of the rotating shaft 3, the axial spacing between the magnetic ring 41 and the Hall element 52 is limited to 1.7mm-2.2mm, so as to ensure the Hall element 52 being triggered stably in the working temperature range.

[0095] According to the stirring equipment of another aspect of the present application, the driving device 100 is connected with the stirring part, and the control of the driving device 100 is more accurate.

[0096] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are contained in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present application.

[0097] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A drive device characterized by comprising: The drive device comprises: a stationary part comprising a stator assembly; a rotor assembly coupled with the stator assembly to rotate relative to the stator assembly, the rotor assembly comprising a rotating shaft; a magnetic ring module and a detection module, one of which is arranged on the stationary part and the other of which is arranged on the rotor assembly, the magnetic ring module comprising a magnetic ring; the detection module comprising a circuit board and at least two Hall elements arranged on the circuit board in a circumferential direction of the rotating shaft, each of the Hall elements being magnetically coupled with the magnetic ring to detect an angle of the rotating shaft.

2. The drive apparatus according to claim 1, characterized by The Hall elements are two.

3. The drive apparatus according to claim 2, characterized by On the same cross section of the rotating shaft, an angle between a line connecting a center of one of the Hall elements with a center of the rotating shaft and a line connecting a center of the other Hall element with the center of the rotating shaft is θ, a number of pole pairs of the magnetic ring is k, and θ = (90° + 180°*N) / k, (N is an integer; 0° < θ < 180°).

4. The drive apparatus according to claim 2, characterized by The number of pole pairs of the magnetic ring is 1.

5. The drive apparatus according to claim 1, characterized by The magnetic ring is sleeved on the rotating shaft.

6. The drive apparatus according to claim 5, characterized by The magnetic ring module further comprises a bushing, the bushing is a plastic part, the magnetic ring is fixed to the bushing, and the bushing is fixed to the rotating shaft.

7. The drive apparatus according to claim 6, characterized by In the axial direction of the rotating shaft, the magnetic ring is located on a side of the bushing facing the Hall elements.

8. The drive apparatus according to claim 7, characterized by The bushing is provided with a mounting groove, and the magnetic ring is placed in the mounting groove.

9. The drive apparatus according to claim 8, characterized by The magnetic ring comprises a center ring and a plurality of protrusions, the plurality of protrusions are connected with the center ring and protrude radially outward from the center ring; the mounting groove comprises a main body portion and a plurality of branch grooves, the plurality of branch grooves are in communication with the main body portion, the center ring is placed in the main body portion, and the plurality of protrusions are placed one by one in the branch grooves.

10. The drive apparatus according to claim 9, characterized by On the same cross section of the rotating shaft, in the radial direction of the center ring, a radial dimension of each of the protrusions is C, an outer diameter of the bushing is E, and the protrusions satisfy E / 3 ≤ C < E.

11. The drive apparatus according to claim 6, characterized by A diameter of a portion of the rotating shaft that cooperates with the bushing is A, and an inner diameter of the magnetic ring is B, where A < B.

12. The drive apparatus according to claim 1, characterized by On the same cross section of the rotating shaft, define two circles passing through the center of the rotating shaft as a first circle and a second circle, the plurality of Hall elements are located between the first circle and the second circle, the first circle passes through an inner circumferential wall of the Hall elements, and the second circle passes through an outer circumferential wall of the Hall elements; a diameter of the first circle is D1, a diameter of the second circle is D2, and a maximum radial length of the magnetic ring is D, where the magnetic ring satisfies D1 ≤ D ≤ D2.

13. The drive arrangement of any one of claims 1-12, wherein, In the axial direction of the rotating shaft, an axial spacing between the magnetic ring and the Hall elements is H, where H ∈ [1, 4] mm.

14. The drive apparatus according to claim 13, characterized by H ∈ [1.7, 2.2] mm.

15. A stirring apparatus, characterized by The drive device comprises: a stationary part comprising a stator assembly; a rotor assembly coupled with the stator assembly to rotate relative to the stator assembly, the rotor assembly comprising a rotating shaft; a magnetic ring module and a detection module, one of which is arranged on the stationary part and the other of which is arranged on the rotor assembly, the magnetic ring module comprising a magnetic ring; the detection module comprising a circuit board and at least two Hall elements arranged on the circuit board in a circumferential direction of the rotating shaft, each of the Hall elements being magnetically coupled with the magnetic ring to detect an angle of the rotating shaft.

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