CN117200505A - Vibrating mirror motor - Google Patents
Vibrating mirror motor Download PDFInfo
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- CN117200505A CN117200505A CN202210605090.1A CN202210605090A CN117200505A CN 117200505 A CN117200505 A CN 117200505A CN 202210605090 A CN202210605090 A CN 202210605090A CN 117200505 A CN117200505 A CN 117200505A
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Abstract
The application relates to the technical field of motors, and provides a vibrating mirror motor which comprises a stator, a rotor and a sensor plate, wherein the rotor comprises a rotating shaft and a vibrating mirror lens, the middle part of the rotating shaft is a pair of magnetic poles magnetized in the radial direction, two ends of the rotating shaft are rotatably arranged in a shell, and the sensor plate is provided with a magnetic sensor. The vibrating mirror motor provided by the application has the beneficial effects that: the middle part of the rotating shaft is a pair of magnetic poles magnetized in the radial direction, so that the rotating shaft can rotate in a rotating magnetic field generated by the driving coil and can be directly sensed by the magnetic sensor to acquire the absolute position of the rotating shaft, the rotating shaft does not need to be additionally provided with a feedback sensor, correspondingly, the size of the vibrating mirror motor is reduced, the technical problem that the size of the vibrating mirror motor in the related art is overlarge is solved, the mounting difficulty of the vibrating mirror motor is reduced, and the yield of the vibrating mirror motor is improved.
Description
Technical Field
The application relates to the technical field of motors, in particular to a vibrating mirror motor.
Background
The galvanometer motor is mainly used for laser equipment such as laser radar, laser marking machine, laser engraving machine and the like. Under the control of the special controller, the rotating shaft of the vibrating mirror motor drives the vibrating mirror to swing, so that the reflected laser can accurately reach a specific position.
In the related art, a stator of a galvanometer motor is a coil, a rotor is a magnet, the rotor is positioned in the stator, and the coil drives the rotor to reciprocate under the action of alternating driving current. In order to achieve the performance of accurate positioning, the tail part of the motor is provided with a cavity which is specially used for installing feedback sensors such as an encoder and the like. However, the installation of the feedback sensor enables the tail of the motor to be prolonged, the size of the vibrating mirror motor is increased, parts of the vibrating mirror motor are increased, the structure is complex, and the yield is low.
Disclosure of Invention
The application aims to provide a vibrating mirror motor and aims to solve the technical problem that the vibrating mirror motor in the related art is overlarge in size.
The application provides a galvanometer motor, comprising:
a stator including a housing and a driving coil installed in the housing;
the rotor comprises a rotating shaft and a vibrating mirror lens, the middle part of the rotating shaft is a pair of magnetic poles magnetized in the radial direction, two ends of the rotating shaft are rotatably arranged in the shell, and one end of the rotating shaft extends to the outside of the shell and is connected with the vibrating mirror lens;
the sensor board is fixed on the inner wall of the shell and is positioned at one end, far away from the vibrating mirror lens, of the shell, and is provided with a magnetic sensor, and the magnetic sensor is used for sensing magnetic field signals generated by a pair of magnetic poles so as to acquire the absolute positions of the rotating shaft and the vibrating mirror lens.
In one embodiment, the drive coil is wound to form a hollow winding.
In one embodiment, the housing is provided with a first limiting member, the rotating shaft is connected with a second limiting member, the first limiting member and the second limiting member are in limiting fit, so that the rotating shaft rotates between a first limiting position and a second limiting position, and a central angle formed by the first limiting position and the second limiting position and the axis of the rotating shaft is smaller than 90 degrees.
In one embodiment, the output signal of the magnetic sensor has a sinusoidal function with respect to the angle of the rotating shaft, and the angle of the rotating shaft between the first limit position and the second limit position corresponds to a monotonic interval of the sinusoidal function.
In one embodiment, the first limiting parts are located on the outer wall of one end, close to the vibrating mirror lens, of the shell, the number of the first limiting parts is two, the two first limiting parts are oppositely arranged, and the second limiting parts correspond to the first limiting parts one by one.
In one embodiment, the first limiting member is two limit stops disposed on an end portion of the housing, the end portion being close to the galvanometer lens, the two limit stops are disposed at intervals, so that the second limiting member contacts one of the limit stops when the rotating shaft rotates to the first limit position, and the second limiting member contacts the other limit stop when the rotating shaft rotates to the second limit position.
In one embodiment, the number of the magnetic sensors is more than two, and the phase difference between any two of the magnetic sensors is more than 0 ° and less than 180 °.
In one embodiment, the magnetic sensor includes a differential hall sensor group including two differential hall sensing units, and a phase difference between the two differential hall sensing units is 180 °.
In one embodiment, the housing includes a housing body and a tail cap, one end of the housing body is open, the tail cap is detachably mounted on the open end of the housing body, the sensor plate is fixed on the inner side of the tail cap, and one end of the rotating shaft is rotatably mounted on the tail cap.
In one embodiment, the tail cap has a wire outlet hole through which the terminal of the driving coil and the lead wire of the sensor board are electrically connected to an external driving board.
In one embodiment, the galvanometer motor further comprises two bearings, the bearings are mounted at two ends of the shell and are sleeved with the rotating shaft, and the driving coil, the magnetic pole, the sensor plate and the magnetic sensor are located between the two bearings.
The vibrating mirror motor provided by the application has the beneficial effects that: the driving coil is connected with alternating current to drive a pair of magnetic poles to rotate, namely the rotating shaft and the vibrating mirror lens to rotate; the rotation of the pair of magnetic poles can change magnetic field signals generated by the pair of magnetic poles, and the magnetic sensor acquires the absolute position of the rotating shaft through sensing the magnetic field signals, so that the absolute position of a vibrating mirror lens connected with the rotating shaft is acquired; the middle part of the rotating shaft is a pair of magnetic poles which are magnetized radially, compared with a plurality of pairs of magnets which are arranged in a staggered and encircling mode, parts are reduced, the rotating shaft can rotate in a rotating magnetic field generated by the driving coil and can be directly perceived by the magnetic sensor to acquire the absolute position of the rotating shaft, and the rotating shaft does not need to be additionally provided with a feedback sensor.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a galvanometer motor according to an embodiment of the present application;
FIG. 2 is an exploded view of the galvanometer motor of FIG. 1;
FIG. 3 is a cross-sectional view of the galvanometer motor of FIG. 1 taken along line A-A;
FIG. 4 is a schematic diagram of the installation of a shaft and a sensor plate of a galvanometer motor according to an embodiment;
FIG. 5 is a schematic view of the sensor board of FIG. 4;
FIG. 6 is a graph of the output signal of a magnetic sensor of a galvanometer motor provided by an embodiment;
FIG. 7 is a schematic view of the mounting of a shaft and sensor plate of a galvanometer motor according to yet another embodiment;
FIG. 8 is a graph of the output signal of the magnetic sensor of the galvanometer motor of FIG. 7;
FIG. 9 is a schematic diagram of the mounting of the shaft and sensor plate of a galvanometer motor according to yet another embodiment;
fig. 10 is a graph of the output signal of the magnetic sensor of the galvanometer motor of fig. 9.
Wherein, each reference sign in the figure:
100. a stator; 110. a housing; 111. a first limiting member; 112. a limit stop; 113. a limit groove; 114. a connecting wall; 115. a housing body; 116. a tail cover; 117. a wire outlet hole; 120. a driving coil; 121. a terminal;
200. a rotor; 210. a rotating shaft; 211. a magnetic pole; 212. a second limiting piece; 220. a vibrating mirror lens;
300. a sensor plate; 310. a magnetic sensor; 311. a differential hall sensor group; 312. a differential hall sensing unit; 320. a lead wire;
400. and (3) a bearing.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present application and should not be construed as limiting the application.
Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrase "in one embodiment" or "in some embodiments" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In the description of the present application, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
The galvanometer motor in the embodiment of the application will now be described.
Referring to fig. 1 to 3, the galvanometer motor provided in the present embodiment includes a stator 100, a rotor 200, and a sensor plate 300.
The stator 100 includes a housing 110 and a driving coil 120 mounted in the housing 110. Wherein, alternatively, the number of the terminals 121 of the driving coil 120 is two. The rotor 200 includes a rotating shaft 210 and a galvanometer lens 220. The middle part of the rotating shaft 210 is a pair of magnetic poles 211 magnetized in radial direction, two ends of the rotating shaft 210 are rotatably installed in the housing 110, and one end of the rotating shaft 210 extends to the outside of the housing 110 and is connected with the galvanometer lens 220. There is a gap between the stator 100 and the rotor 200. The sensor board 300 is fixed on the inner wall of the housing 110 and is located at one end of the housing 110 far away from the galvanometer mirror 220, and the sensor board 300 is provided with a magnetic sensor 310, wherein the magnetic sensor 310 is used for sensing magnetic field signals generated by the pair of magnetic poles 211 so as to acquire absolute positions of the rotating shaft 210 and the galvanometer mirror 220.
In an embodiment of the present application, only two terminals 121 of the driving coil 120 are connected with alternating current, and only the alternating current serving as a control signal needs to be input in one direction, so that the driving coil 120 generates a rotating magnetic field to drive a pair of magnetic poles 211 to rotate, namely, the rotating shaft 210 and the galvanometer lens 220 to rotate. The rotation of the pair of magnetic poles 211 changes the magnetic field signal generated by the pair of magnetic poles, and the magnetic sensor 310 obtains the absolute position of the rotating shaft 210 by sensing the magnetic field signal, thereby obtaining the absolute position of the galvanometer lens 220 connected with the rotating shaft 210. The middle part of the rotating shaft 210 is a pair of magnetic poles 211 magnetized radially, compared with a plurality of pairs of magnets which are arranged in a staggered and encircling manner, the parts are reduced, the rotating shaft can rotate in a rotating magnetic field generated by the driving coil 120, and the magnetic field signals of the rotating shaft can be sensed by the magnetic sensor 310 directly to obtain the absolute position of the rotating shaft 210, so that the rotating shaft 210 does not need to be additionally provided with a feedback sensor, the structure is compact, the installation difficulty of the vibrating mirror motor is reduced, the size of the vibrating mirror motor is reduced, and the yield of the vibrating mirror motor is improved.
In another embodiment of the present application, the driving coil 120 is wound to form a hollow winding, and the driving coil 120 has no iron core inside, and has the characteristics of small inductance and small counter potential, so that the control signal changes more rapidly, and the response speed is improved.
In still another embodiment of the present application, referring to fig. 2, the housing 110 is provided with a first limiting member 111, the rotating shaft 210 is connected with a second limiting member 212, and the first limiting member 111 and the second limiting member 212 are in limiting fit, so that the rotating shaft 210 rotates between a first limit position and a second limit position, and a central angle formed by the first limit position and the second limit position and an axis of the rotating shaft 210 is smaller than 90 °. In other words, the rotation angle by which the rotation shaft 210 rotates about its own axis from the first limit position to the second limit position is the central angle.
On the premise of meeting the rotation requirement of the laser radar product on the galvanometer lens 220, the galvanometer motor limits the rotation angle of the galvanometer lens 220 within 90 degrees, which is favorable for quickly determining the rotation angle of the rotating shaft 210 relative to the initial position within a limited rotation angle according to the output signal of the magnetic sensor 310, and further determining the absolute positions of the rotating shaft 210 and the galvanometer lens 220.
Alternatively, the central angles formed by the first and second limit positions and the axis of the rotation shaft 210 are 5 °, 10 °, 20 °, 30 °, 45 °, or 60 °.
Referring to fig. 3 and 6, the output signal of the magnetic sensor 310 is sinusoidal with respect to the angle of the rotating shaft 210, and the magnetic sensor 310 generates a complete sine wave when the rotating shaft 210 rotates one revolution. The sine function relation in the present application means that the output signal y of the magnetic sensor 310 and the angle x of the rotating shaft 210 satisfy the sine function analysis formulaWherein parameters A, ω, ">And h is dependent on the specific scenario.
In some embodiments, the angle of the rotating shaft 210 between the first limit position and the second limit position corresponds to a monotonic interval of a sine function relationship, in other words, the output signal y of the magnetic sensor 310 corresponds to the angle x of the rotating shaft 210 one by one, so that the angle x of the rotating shaft 210 is obtained as a unique value according to the output signal y of the magnetic sensor 310. For example, referring to fig. 6, the dashed box is located within the monotonic interval of curve B, but not within the monotonic interval of curve a.
Wherein the output signal of the magnetic sensor 310 is typically a voltage.
The worker can define the positional relationship between the magnetic sensor 310 and the magnetic pole 211 at the time of production, thereby ensuring that the angle of the rotation shaft 210 between the first limit position and the second limit position corresponds to a monotonic interval of the sinusoidal functional relationship.
Specifically, referring to fig. 7, when the rotating shaft 210 is at the initial position, the magnetic sensor 310 is mounted on the sensor board 300, and the junction between the magnetic sensor 310 and the pair of magnetic poles 211 is located in the same radial direction of the rotating shaft 210. In other words, the rotation angle of the rotation shaft 210 is 0, and the magnetic sensor 310 is disposed opposite to the junction of the pair of magnetic poles 211. As shown in fig. 8, since the magnetic field strength at the boundary of the pair of magnetic poles 211 is the smallest, at this time, the output signal of the magnetic sensor 310 is the average value of sine waves (see point C in fig. 8), and the rotation shaft 210 rotates within ±45°, which are all located in the monotonic section of the sine function relationship, so that the output signal of the magnetic sensor 310 and the angle of the rotation shaft 210 correspond one to one. In this way, at the time of production, by defining the relative positional relationship between the magnetic sensor 310 and the pair of magnetic poles 211 at the initial position, a monotonic section of the angular correspondence sinusoidal functional relationship between the first limit position and the second limit position of the rotating shaft 210 is realized.
It will be appreciated that, since the rotation angle of the rotation shaft 210 is smaller than 90 °, in other examples, it is only necessary to ensure that the rotation shaft 210 falls within a monotonic interval of a sine function relationship when rotating within the rotation angle range, and the interface between the magnetic sensor 310 and the pair of magnetic poles 211 is not necessarily required to be located in the same radial direction of the rotation shaft 210 when the rotation shaft 210 is in the initial position. For example, the rotation angle of the rotation shaft 210 is ±pi/6, and when the rotation angle of the rotation shaft 210 is 0, the central angle formed between the boundary of the magnetic sensor 310 and the pair of magnetic poles 211 is within ±pi/3. Referring to fig. 8, when the rotation shaft 210 is at the initial position, the abscissa is located in the interval D, and the interval D moves by pi/6 left and right, and still corresponds to the monotonic interval of the sine function relationship, that is, the output signal of the magnetic sensor 310 corresponds to the angle of the rotation shaft 210 one by one.
Specifically, referring to fig. 9, when the rotating shaft 210 is at the first limit position or the second limit position, the magnetic sensor 310 is mounted on the sensor board 300, and a central angle formed at the intersection of the magnetic sensor 310 and the pair of magnetic poles 211 is 90 °. In other words, the magnetic sensor 310 is disposed opposite to the furthest point of one of the magnetic poles 211 from the other magnetic pole 211. Referring to fig. 10, when the central angle formed by the intersection of the magnetic sensor 310 and the pair of magnetic poles 211 is 90, the output signal of the magnetic sensor 310 is a peak E or a peak F, and the rotation axis 210 rotates 90 ° along a certain rotation direction, i.e. the abscissa of the peak E or the peak F in fig. 10 shifts by pi/2 to the left or pi/2 to the right, and still lies in the monotonic interval of the sine function relationship, so that the output signal of the magnetic sensor 310 corresponds to the angle of the rotation axis 210 one by one.
It will be appreciated that, in other examples, since the rotation angle of the rotating shaft 210 is smaller than 90 °, the interface between the magnetic sensor 310 and the pair of magnetic poles 211 does not necessarily have to be a central angle of 90 ° when the rotating shaft 210 is at the first limit position or the second limit position, and it is only necessary to ensure that the rotating shaft 210 falls into a monotonic interval of a sine function relationship when rotating within a limited angle.
In some embodiments, referring to fig. 5, the number of magnetic sensors 310 is more than two, and the phase difference between any two magnetic sensors 310 is greater than 0 ° and less than 180 °. At this time, the output signal of each magnetic sensor 310 and the angle of the rotating shaft 210 are in a sine function relationship, and two sine curves (see curves a and B in fig. 6) are obtained through more than two magnetic sensors 310, which has a backup effect of mutual correction, and can uniquely determine the rotating angle of the rotating shaft 210, so as to obtain the absolute positions of the rotating shaft 210 and the galvanometer lens 220, and it is not necessarily required that the angle of the rotating shaft 210 between the first limit position and the second limit position corresponds to a monotonic interval of the sine function relationship, that is, the relative positions between the magnetic sensors 310 and the magnetic poles 211 do not need to be considered during installation, so that the installation difficulty is further reduced, and the yield is improved.
Typically, the number of magnetic sensors 310 is two or three. For example, referring to fig. 6, the number of magnetic sensors 310 is two. The two magnetic sensors 310 can be mounted on the sensor board 300 at any position, and can uniquely determine the angle of the rotating shaft 210, so as to meet the requirement of measuring the absolute position of the galvanometer lens 220, therefore, the number of parts of the galvanometer motor can be reduced by using as few magnetic sensors 310 as possible, and the mounting difficulty and cost of the galvanometer motor can be reduced.
In yet another embodiment of the present application, the magnetic sensor 310 is a hall sensor, MR (Magneto Resistance) sensor, or MI (Magneto Impedance) sensor.
Specifically, referring to fig. 5, the magnetic sensor 310 includes a differential hall sensor group 311. The differential hall sensor group 311 includes two differential hall sensing units 312, and a phase difference between the two differential hall sensing units 312 is 180 °. The two differential hall sensing units 312 of the differential hall sensor group 311 are oppositely arranged on the sensor board 300 to form differential signals, so that one of the differential hall sensing units 312 is prevented from being interfered by an environmental magnetic field, the anti-interference capability of the signals is improved, the accuracy of the magnetic sensor 310 is improved, and the reliability of the galvanometer motor is improved.
In this embodiment, the pair of magnetic poles 211 magnetized in the radial direction are cylindrical. One of the poles 211 is an S pole and the other pole 211 is an N pole. The magnetic pole 211 is a permanent magnet.
In the present embodiment, referring to fig. 1 and 2, the first limiting member 111 is located on an outer wall of one end of the housing 110 near the galvanometer lens 220. The first limiting piece 111 is arranged on the outer wall of the shell 110, so that the first limiting piece 111 and the second limiting piece 212 form limiting fit during production, the installation difficulty is reduced, and the yield is improved.
Wherein, the vibrating mirror 220 is driven to rotate by the rotating shaft 210, the vibrating mirror 220 belongs to the rotor 200, the shell 110 belongs to the stator 100, and a gap is formed between the vibrating mirror 220 and the stator 100, so that friction between the vibrating mirror 220 and the stator 100 is avoided. The first limiting part 111 is located at one end of the housing 110, which is close to the galvanometer lens 220, and fully utilizes the gap between the housing 110 and the galvanometer lens 220 to realize the installation, so that the limiting function of the galvanometer lens 220 is realized under the condition that the volume of the galvanometer motor is not increased.
Specifically, referring to fig. 1, the rotation areas of the first limiting member 111 and the galvanometer lens 220 are offset from each other on one end surface of the housing 110. In other words, the rotation process of the galvanometer lens 220 does not touch the first limiting member 111, so that the galvanometer lens 220 does not need to be staggered on the axis of the rotating shaft 210 to avoid the first limiting member 111. The length of the shaft 210 exposed at one end of the housing 110 can be shortened as much as possible, so that the installation of the galvanometer lens 220 can be satisfied, and the length of the galvanometer motor can be reduced.
It will be appreciated that in other embodiments, the first and second limiting members 111, 212 may be located inside the housing 110, but may increase the diameter of the housing 110, or may be located at an end of the housing 110 remote from the galvanometer lens 220, but may increase the length of the galvanometer motor.
Specifically, referring to fig. 1, the number of the first limiting members 111 is two. The two first limiting parts 111 are oppositely arranged, and the second limiting parts 212 are in one-to-one correspondence with the first limiting parts 111. The number of the second limiting members 212 is two, and each second limiting member 212 is in limiting fit with the corresponding first limiting member 111. Thus, the limiting force applied to the rotating shaft 210 by the shell 110 is two, so that the rotating shaft 210 can be stressed more uniformly and reasonably, and the reliability of the vibrating mirror motor is improved.
Alternatively, the two first limiting members 111 are disposed opposite to each other, so that the limiting force applied to the rotating shaft 210 is symmetrical, which is beneficial for the rotating shaft 210 to rotate smoothly within a small angle.
Specifically, referring to fig. 1 and 2, the first limiting member 111 is two limiting blocks 112 disposed at an end portion of the housing 110 near the galvanometer lens 220, and the two limiting blocks 112 are disposed at intervals. The second limiting member 212 contacts one of the limiting stops 112 when the rotation shaft 210 rotates to the first limit position, and blocks the rotation shaft 210 from further rotation. The second limiting member 212 contacts the other limit stop 112 when the rotation shaft 210 rotates to the second limit position, and blocks the rotation shaft 210 from continuing to rotate, so that the rotation shaft 210 performs limited-angle rotation between the first limit position and the second limit position.
Wherein, a limit groove 113 is formed between the two limit stops 112, and the second limiting member 212 rotates in the limit groove 113 by a limited angle.
Further, the first limiting member 111 further includes a connecting wall 114 protruding from an end portion of the housing 110, and two ends of the connecting wall 114 are respectively connected to end portions of the two limiting stops 112, which are far from the rotating shaft 210.
In this embodiment, the second limiting member 212 is a limiting pin.
In yet another embodiment of the present embodiment, referring to fig. 2 and 3, the galvanometer motor further includes two bearings 400. The two bearings 400 are respectively mounted at two ends of the housing 110 and are sleeved with the rotating shaft 210, and provide rotation support for the rotating shaft 210 from two ends of the rotating shaft 210, so that the support effect is improved, and the rotating shaft 210 and the vibrating mirror 220 rotate more stably.
Wherein, the driving coil 120, the magnetic pole 211, the sensor board 300 and the magnetic sensor 310 are all positioned between the two bearings 400, so that the vibrating mirror motor is compact in structure.
Specifically, with reference to fig. 3, the driving coil 120 is directly fixed around the inner sidewall of the housing 110.
For example, the driving coil 120 is adhesively fixed to the inner sidewall of the housing 110, without using other auxiliary mounting structures, to avoid increasing the diameter of the housing 110.
The housing 110 has a relatively closed cylindrical cavity formed therein, and a pair of magnetic poles 211 having a cylindrical shape is disposed in the cylindrical cavity, and has a compact structure in a shape of a suitable shape. The length of the pair of magnetic poles 211 is equal to or different from the length of the driving coil 120 by less than 1mm in the axial direction of the rotating shaft 210. Most of the side areas of the pair of magnetic poles 211 magnetized in the radial direction are used for interaction with the electromagnetic force of the driving coil 120, so that the area of interaction is maximized, and the diameters of the housing 110 and the pair of magnetic poles 211 can be designed smaller.
The sensor plate 300 is mounted on the inner side of the end of the housing 110 remote from the galvanometer lens 220, the sensor plate 300 is a circular plate, and the middle of the sensor plate 300 has a through hole through which the end of the rotation shaft 210 passes, so that the end of the rotation shaft 210 is mounted on the bearing 400. The projections of the sensor plate 300 and the pair of magnetic poles 211 in the axial direction of the rotation shaft 210 substantially coincide. The magnetic sensor 310 is mounted on one side surface of the sensor plate 300, which is close to the magnetic poles 211, the magnetic sensor 310 is arranged opposite to the tail parts of the pair of magnetic poles 211, the distance is small, the detection accuracy of the magnetic sensor 310 is improved, and the reliability of the vibrating mirror motor is improved.
In yet another embodiment of the present embodiment, referring to fig. 1 and 2, the housing 110 includes a housing body 115 and a tail cap 116. One end of the case body 115 is opened so that the driving coil 120 and the rotation shaft 210 can be installed inside the case body 115. The tail cap 116 is detachably mounted to the open end of the case body 115, the sensor plate 300 is fixed to the inner side of the tail cap 116, and one end of the rotation shaft 210 is rotatably mounted to the tail cap 116 by means of a bearing 400.
Specifically, the tail cap 116 has a wire outlet hole 117, and the terminal 121 of the driving coil 120 and the lead 320 of the sensor board 300 are electrically connected to an external driving board through the wire outlet hole 117. The drive plate is used for supplying an alternating current to the drive coil 120 and for acquiring an output signal of the magnetic sensor 310. Therefore, the driving plate is arranged outside the vibrating mirror motor, so that the internal space of the shell 110 is prevented from being occupied, the volume of the shell 110 is further compressed, and the structure of the vibrating mirror motor is more compact.
The number of the wire-out holes 117 may be one, and the terminal 121 of the driving coil 120 and the lead 320 of the sensor board 300 are led out of the galvanometer motor from the same wire-out hole 117. The number of the wire-out holes 117 may be two, and the terminal 121 of the driving coil 120 and the lead 320 of the sensor board 300 are led out of the galvanometer motor through different wire-out holes 117, respectively.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application.
Claims (10)
1. A galvanometer motor, comprising:
a stator including a housing and a driving coil installed in the housing;
the rotor comprises a rotating shaft and a vibrating mirror lens, the middle part of the rotating shaft is a pair of magnetic poles magnetized in the radial direction, two ends of the rotating shaft are rotatably arranged in the shell, and one end of the rotating shaft extends to the outside of the shell and is connected with the vibrating mirror lens;
the sensor board is fixed on the inner wall of the shell and is positioned at one end, far away from the vibrating mirror lens, of the shell, and is provided with a magnetic sensor, and the magnetic sensor is used for sensing magnetic field signals generated by a pair of magnetic poles so as to acquire the absolute positions of the rotating shaft and the vibrating mirror lens.
2. The galvanometer motor of claim 1, wherein: the casing is provided with a first limiting part, the rotating shaft is connected with a second limiting part, the first limiting part is in limiting fit with the second limiting part, so that the rotating shaft rotates between a first limiting position and a second limiting position, and a central angle formed by the first limiting position and the second limiting position and the axis of the rotating shaft is smaller than 90 degrees.
3. The galvanometer motor of claim 2, wherein: the output signal of the magnetic sensor and the angle of the rotating shaft are in a sine function relationship, and the angle of the rotating shaft between the first limit position and the second limit position corresponds to a monotonic interval of the sine function relationship.
4. The galvanometer motor of claim 2, wherein: the first limiting parts are located on the outer wall of one end, close to the vibrating mirror lens, of the shell, the number of the first limiting parts is two, the two first limiting parts are oppositely arranged, and the second limiting parts correspond to the first limiting parts one by one.
5. The galvanometer motor of claim 2, wherein: the first limiting piece is two limiting blocks which are arranged on one end part of the shell and close to the vibrating mirror lens, the two limiting blocks are arranged at intervals, the second limiting piece is in contact with one limiting block when the rotating shaft rotates to the first limiting position, and the second limiting piece is in contact with the other limiting block when the rotating shaft rotates to the second limiting position.
6. The galvanometer motor of claim 1, wherein: the number of the magnetic sensors is more than two, and the phase difference between any two magnetic sensors is more than 0 DEG and less than 180 deg.
7. The galvanometer motor of claim 1, wherein: the magnetic sensor comprises a differential Hall sensor group, the differential Hall sensor group comprises two differential Hall sensing units, and the phase difference between the two differential Hall sensing units is 180 degrees.
8. The galvanometer motor of claim 1, wherein: the shell comprises a shell body and a tail cover, one end of the shell body is open, the tail cover is detachably arranged at the open end of the shell body, the sensor plate is fixed on the inner side of the tail cover, and one end of the rotating shaft is rotatably arranged at the tail cover.
9. The galvanometer motor of claim 1, wherein: the driving coil is wound to form a hollow winding.
10. A galvanometer motor according to any one of claims 1 to 9, characterized in that: the vibrating mirror motor further comprises two bearings, the bearings are mounted at two ends of the shell and are sleeved with the rotating shaft, and the driving coil, the magnetic poles, the sensor plate and the magnetic sensor are located between the two bearings.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210605090.1A CN117200505A (en) | 2022-05-31 | 2022-05-31 | Vibrating mirror motor |
| US18/203,620 US20230384349A1 (en) | 2022-05-31 | 2023-05-30 | Galvanometer motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210605090.1A CN117200505A (en) | 2022-05-31 | 2022-05-31 | Vibrating mirror motor |
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| Publication Number | Publication Date |
|---|---|
| CN117200505A true CN117200505A (en) | 2023-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210605090.1A Pending CN117200505A (en) | 2022-05-31 | 2022-05-31 | Vibrating mirror motor |
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| Country | Link |
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| CN (1) | CN117200505A (en) |
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| CN215498605U (en) * | 2021-07-28 | 2022-01-11 | 广东罗曼智能科技股份有限公司 | Electric toothbrush motor and electric toothbrush |
| CN114024400A (en) * | 2021-12-10 | 2022-02-08 | 星移控制科技(广州)有限公司 | Swing angle linear output motor |
| CN114039460A (en) * | 2021-12-01 | 2022-02-11 | 图达通智能科技(苏州)有限公司 | Laser radar outer rotor motor with rotating speed monitoring function and laser radar |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09269461A (en) * | 1996-03-29 | 1997-10-14 | Toshiba Lighting & Technol Corp | Scanner motor and motor assembling equipment |
| JP2001275331A (en) * | 2000-03-27 | 2001-10-05 | Mitsubishi Materials Corp | Oscillating actuator |
| US20190020245A1 (en) * | 2017-07-17 | 2019-01-17 | Autel Robotics Co., Ltd. | Motor, gimbal and mechanical arm having same |
| DE102019116015A1 (en) * | 2019-06-12 | 2020-12-17 | Maxon International Ag | Axial flux motor with redundant rotor position detection for a LIDAR system |
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| CN114039460A (en) * | 2021-12-01 | 2022-02-11 | 图达通智能科技(苏州)有限公司 | Laser radar outer rotor motor with rotating speed monitoring function and laser radar |
| CN114024400A (en) * | 2021-12-10 | 2022-02-08 | 星移控制科技(广州)有限公司 | Swing angle linear output motor |
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