Brush permanent magnet micromotor

Abstract

The utility model belongs to the technical field of motors, and particularly relates to a brush permanent magnet micromotor. In the brush permanent magnet micromotor, a first stator bracket is provided with a first mounting cavity, and the inner wall of the first mounting cavity is provided with a first supporting table; the first permanent magnet is installed in the first installation cavity and abuts against the first supporting table. A second mounting cavity is formed in the second stator bracket; a second supporting table is arranged on the inner wall of the second mounting cavity; the second permanent magnet is installed in the second installation cavity and abuts against the second supporting table. The magnetic conductive shell is sleeved on the first stator support and the second stator support. According to the utility model, the tolerances between the first permanent magnet and the magnetic conductive shell and between the second permanent magnet and the magnetic conductive shell are accumulated towards the outsides of the first supporting table and the second supporting table, so that magnetic gaps between the first permanent magnet and the iron core winding and between the second permanent magnet and the iron core winding can be reduced, and the magnetic efficiency and torque of the motor are improved, thereby reducing the driving current; and the use amount of the permanent magnets and / or the iron cores and / or the copper wires can be reduced, and the consistency of products is also ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to motor technical field, especially relate to a brush permanent magnet micro motor. BACKGROUND

[0002] The brush permanent magnet motor is generally composed of a casing, a permanent magnet, a rotor assembly and a rear end cover. The rotor assembly is composed of a motor shaft, an iron core winding and a commutator. A front bearing is sleeved on the front end of the casing. The permanent magnet is pasted or clamped on the inner wall of the casing by a clamping spring. The rotor assembly is installed in the casing. The rear end cover is fastened on the casing. A rear bearing and a plastic part for installing a brush assembly are embedded on the rear end cover. The brush assembly is embedded in the plastic part. The brush assembly keeps contact with the commutator. One end of the motor shaft is installed on the rear bearing of the rear end cover. The other end of the motor shaft is installed on the front bearing at the front end of the casing.

[0003] The permanent magnet is installed on the inner wall of the casing and needs to keep a certain magnetic gap with the rotor assembly. In the prior art, the permanent magnet is usually fixed on the inner wall of the casing by a clamping spring. Since there is a manufacturing tolerance between the permanent magnet and the casing, the manufacturing tolerance between the permanent magnet and the casing will accumulate from the inner wall of the casing to the inside. The front bearing on the casing and the rear bearing of the rear end cover together support the rotor assembly, so it is difficult to ensure the concentricity. In order to ensure that the permanent magnet does not contact the rotor assembly, the gap between the motor shaft and the bearing hole needs to be increased (if the gap is too small, the front and rear bearings will be stuck when they are not concentric), and the magnetic gap between the permanent magnet and the rotor assembly also needs to be increased, so as to ensure the normal operation of the brush permanent magnet motor.

[0004] In order to ensure the coaxiality of the inner wall of the shell and the bearing hole at the front end of the shell, the shell is usually made of a drawn metal material (a drawn shell), but the mold required for manufacturing the drawn shell has problems of large volume, high cost, requiring a large-tonnage punch and low utilization rate of the drawn material; and due to the problems of stress change, taper tolerance of the inner wall of the shell and concentricity tolerance of the bearing hole at the front end of the shell in the manufacturing process of the drawn shell, the thickness is also difficult to be uniform, the inner wall of the drawn shell cannot guarantee the coaxiality and the fit with the magnetic shoe (i.e. there is also a gap between the magnetic shoe and the inner wall of the shell), so that the magnetic gap between the permanent magnet and the rotor assembly cannot be reduced, and the magnetic gap is generally 0.25-0.4mm; according to the formula: F = (μ0 / 4π) * [(m1 * m2) / r^2], wherein F represents the magnetic force (repulsion or attraction) between the magnets, μ0 is the magnetic permeability in vacuum (constant), m1 is the magnetic moment of the first magnet (which can be set as the magnetic moment of the permanent magnet), m2 is the magnetic moment of the second magnet (which can be set as the magnetic moment generated by the iron core winding, and the magnetic moment is related to the driving current of the iron core winding, the iron core, the number of turns of the coil and the wire diameter), and r is the distance between the two magnets, i.e. the magnetic gap; since the magnetic moment of the motor permanent magnet is a constant value, and the magnetic moment generated by the rotor coil is related to the driving current and is proportional to the driving current (when the driving current is the same, the magnetic gap is reduced, the motor load torque is increased; when the load torque is the same, the magnetic gap is reduced, the driving current is reduced, the number of turns of the rotor coil and / or the wire diameter can be reduced to save copper wire and / or reduce the amount of iron core used when meeting the driving requirements), therefore, reducing the magnetic gap can effectively improve the magnetic efficiency and torque of the motor, and can reduce the resource occupation. SUMMARY

[0005] The utility model embodiment provides a kind of brush permanent magnet micro motor to solve the technical problems such as the magnetic gap of brush permanent magnet motor in prior art cannot be guaranteed.

[0006] An embodiment of the utility model provides a kind of brush permanent magnet micro motor, including rotor mechanism and stator mechanism;

[0007] The rotor mechanism includes motor shaft, and iron core winding and commutator mounted on the motor shaft;

[0008] The stator mechanism includes magnetic shell, first stator support, second stator support, first permanent magnet, second permanent magnet, first brush assembly and second brush assembly, first stator support is equipped with first accommodating cavity, and second stator support is equipped with second accommodating cavity;The first stator support is installed on the second stator support, and the rotor mechanism is installed in the first accommodating cavity and the second accommodating cavity;The first brush assembly is installed on the first stator support, and the second brush assembly is installed on the second stator support, and the first brush assembly and the second brush assembly are in contact with the commutator;

[0009] The first stator support is further provided with a first installation cavity in communication with the first accommodating cavity, and an inner wall of the first installation cavity is provided with a first supporting table; the first permanent magnet is installed in the first installation cavity and abuts against the first supporting table;

[0010] The second stator support is further provided with a second installation cavity in communication with the second accommodating cavity, and an inner wall of the second installation cavity is provided with a second supporting table; the second permanent magnet is installed in the second installation cavity and abuts against the second supporting table;

[0011] The magnetic conductive shell is arranged on the first stator support and the second stator support and is arranged opposite to the first permanent magnet and the second permanent magnet.

[0012] Optionally, the mover mechanism further comprises a front bearing and a rear bearing arranged on both ends of the motor shaft;

[0013] The first stator support is further provided with a first front arc-shaped recess in communication with the first accommodating cavity and a first rear arc-shaped recess coaxial with the first front arc-shaped recess, and the second stator support is further provided with a second front arc-shaped recess in communication with the second accommodating cavity and a second rear arc-shaped recess coaxial with the second front arc-shaped recess; the front bearing is installed in the first front arc-shaped recess and the second front arc-shaped recess; and the rear bearing is installed in the first rear arc-shaped recess and the second rear arc-shaped recess;

[0014] The first supporting table is a first arc-shaped boss coaxial with the first front arc-shaped recess, and the second supporting table is a second arc-shaped boss coaxial with the second front arc-shaped recess.

[0015] Optionally, the first permanent magnet comprises a first magnetic tile covering the first stator support, and the first magnetic tile abuts against the first arc-shaped boss;

[0016] The second permanent magnet comprises a second magnetic tile covering the second stator support, and the second magnetic tile abuts against the second arc-shaped boss.

[0017] Optionally, the magnetic conductive shell comprises a first magnetic shell and a second magnetic shell connected to the first magnetic shell, and a joint is arranged at a connection position of the first magnetic shell and the second magnetic shell;

[0018] The joint, a first center line of the first permanent magnet, and a second center line of the second permanent magnet are in the same plane.

[0019] Optionally, the first stator support and the second stator support are centrally symmetrically distributed about an axis of the motor shaft;

[0020] The first brush assembly and the second brush assembly are centrally symmetrically distributed about the axis of the motor shaft.

[0021] The first permanent magnet and the second permanent magnet are centrally symmetrically distributed about an axis of the motor shaft;

[0022] The first support and the second support are centrally symmetrically distributed about an axis of the motor shaft;

[0023] The first magnetic shell and the second magnetic shell are centrally symmetrically distributed about an axis of the motor shaft.

[0024] Optionally, the magnetic guide shell is formed by winding a flexible magnetic guide material on the first stator support and the second stator support.

[0025] Optionally, the first stator support is provided with a first recessed groove and a first protrusion, and the second stator support is provided with a second protrusion matched with the first recessed groove and a second recessed groove matched with the first protrusion.

[0026] The first brush assembly and the second brush assembly each include a brush holder and a brush body mounted on the brush holder, and the brush body is in contact with the commutator.

[0027] The first brush assembly is placed in the first recessed groove and is fixed by the second protrusion, and the second brush assembly is placed in the second recessed groove and is fixed by the first protrusion.

[0028] Optionally, the first brush assembly and the second brush assembly each include a clamping tongue arranged on one side of the brush holder, and the clamping tongue extends towards the direction of the core winding; the first recessed groove and the second recessed groove are each provided with a clamping groove matched with the clamping tongue, and the clamping tongue is clamped in the clamping groove.

[0029] Optionally, the first stator support and / or the second stator support is provided with a ventilation groove, and the ventilation groove communicates the first accommodating cavity and the second accommodating cavity.

[0030] Optionally, a bonding surface between the first stator support and the second stator support is provided with a fusion protrusion, and the first stator support and the second stator support are welded together through the fusion protrusion.

[0031] The utility model discloses a first stator support still be equipped with first installation cavity, be equipped with first support on the inner wall of first installation cavity, the first permanent magnet is installed in first installation cavity and with first support abuts, second stator support still be equipped with second installation cavity, be equipped with second support on the inner wall of second installation cavity, the second permanent magnet is installed in second installation cavity and with second support abuts, the magnetically conductive shell is equipped on first stator support and second stator support, first stator support and second stator support can be made of plastics, first stator support, second stator support and magnetically conductive shell can replace stretch machine shell, rear end cover and other components, that is, the stator mechanism is assembled by multiple components, which reduces the manufacturing cost of the stator mechanism.

[0032] In addition, when manufacturing the first stator support, only the position accuracy of the first support needs to be ensured, so that the magnetic gap between the first permanent magnet and the core winding can be ensured; when manufacturing the second stator support, only the position accuracy of the second support needs to be ensured, so that the magnetic gap between the second permanent magnet and the core winding can be ensured; the design of the first support and the second support makes the tolerance between the first permanent magnet, the second permanent magnet and the magnetically conductive shell accumulate towards the outer area of the first support and the second support, so that the magnetic gap between the first permanent magnet, the second permanent magnet and the core winding can be reduced, the magnetic efficiency and the torque of the brush-type permanent magnet micro motor are improved, the driving current can be reduced, the use amount of the permanent magnet and / or the core and / or the copper wire of the core winding can be reduced, energy saving and material reduction are achieved, and the consistency of products is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will be briefly introduced the drawings needed to be used in the description of the embodiments of the utility model, obviously, the drawings in the following description only some embodiments of the utility model, for those skilled in the art, under the premise of not paying the creative labor, other drawings can also be obtained according to these drawings.

[0034] Figure 1 It is the sectional view of the brush-type permanent magnet micro motor provided by an embodiment of the utility model;

[0035] Figure 2 It is the exploded structural schematic diagram of the brush-type permanent magnet micro motor provided by an embodiment of the utility model;

[0036] Figure 3 It is the partial structure schematic diagram of the brush-type permanent magnet micro motor provided by an embodiment of the utility model;

[0037] Figure 4is an explosion structure schematic view of a mover mechanism provided by an embodiment of the utility model;

[0038] Figure 5 is a structure schematic view of a first stator support of a brush permanent magnet micro motor provided by an embodiment of the utility model;

[0039] Figure 6 is a structure schematic view of a first permanent magnet and a second permanent magnet installed in a magnetic conducting shell provided by an embodiment of the utility model;

[0040] Figure 7 is a front view of a brush assembly of a brush permanent magnet micro motor provided by an embodiment of the utility model;

[0041] Figure 8 is a structure schematic view of a first stator support and an external shell integrated provided by an embodiment of the utility model;

[0042] Figure 9 is a structure schematic view of two magnetic conducting shells of a brush permanent magnet micro motor provided by an embodiment of the utility model;

[0043] Figure 10 is a structure schematic view of two directions of a brush permanent magnet micro motor provided by an embodiment of the utility model.

[0044] The reference signs in the specification are as follows:

[0045] 1, mover mechanism;11, motor shaft;12, iron core winding;13, commutator;14, front bearing;15, rear bearing;

[0046] 2, stator mechanism;21, magnetic conducting shell;211, first magnetic shell;212, second magnetic shell;213, joint;22, first stator support;221, first accommodating cavity;222, first installation cavity;223, first support table;224, first front arc-shaped recess;225, first recessed groove;226, clamping groove;227, first protruding block;228, first rear arc-shaped recess;229, air vent recess;2210, fusion protrusion;23, second stator support;231, second accommodating cavity;232, second installation cavity;233, second support table;234, second front arc-shaped recess;235, second protruding block;237, second recessed groove;238, second rear arc-shaped recess;24, first permanent magnet;25, second permanent magnet;26, first brush assembly;261, brush holder;262, brush body;263, clamping tongue;27, second brush assembly. DETAILED DESCRIPTION

[0047] In order to make the technical problems, technical schemes and beneficial effects solved by the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and do not limit the utility model.

[0048] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0049] In the description of the utility model, it should be pointed out that, unless otherwise specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0050] As shown in Figures 1 to 3 An embodiment of the utility model provides a brush permanent magnet micro motor, including rotor mechanism 1 and stator mechanism 2;

[0051] As shown in Figure 4 The rotor mechanism 1 includes motor shaft 11 and core winding 12 and commutator 13 all installed on the motor shaft 11, and it can be understood that the core winding 12 has a wire harness electrically connected with the commutator 13.

[0052] As shown in Figure 2 And Figure 5As shown, the stator mechanism 2 comprises a magnetic conductive shell 21, a first stator support 22, a second stator support 23, a first permanent magnet 24, a second permanent magnet 25, a first brush assembly 26 and a second brush assembly 27, the first stator support 22 is provided with a first accommodating cavity 221, and the second stator support 23 is provided with a second accommodating cavity 231; the first stator support 22 is installed on the second stator support 23, and the mover mechanism 1 is installed in the first accommodating cavity 221 and the second accommodating cavity 231; the first brush assembly 26 is installed on the first stator support 22, the second brush assembly 27 is installed on the second stator support 23, and the first brush assembly 26 and the second brush assembly 27 are in contact with the commutator 13; it can be understood that the first accommodating cavity 221 and the second accommodating cavity 231 can be two semicircular arc grooves, or arc grooves of different proportions, and the first accommodating cavity 221 and the second accommodating cavity 231 accommodate the mover mechanism 1; during rotation of the mover mechanism 1, the first brush assembly 26 and the second brush assembly 27 are always in electrical connection with the commutator 13. Further, the first stator support 22 and the second stator support 23 can be made of plastic.

[0053] The first stator support 22 is further provided with a first installation cavity 222 communicating with the first accommodating cavity 221, and the inner wall of the first installation cavity 222 is provided with a first support 223; the first permanent magnet 24 is installed in the first installation cavity 222 and abuts against the first support 223; it can be understood that the first support 223 is arranged on the inner wall of the first installation cavity 222 along the direction of the motor shaft 11; further, the first support 233 is provided with two, and the two first supports 233 are respectively arranged on the inner walls of the front and rear ends of the first installation cavity 222.

[0054] The second stator support 23 is further provided with a second installation cavity 232 communicating with the second accommodating cavity 231, and the inner wall of the second installation cavity 232 is provided with a second support 233; the second permanent magnet 25 is installed in the second installation cavity 232 and abuts against the second support 233; it can be understood that the second support 233 is arranged on the inner wall of the second installation cavity 232 along the direction of the motor shaft 11; further, the second support 233 is provided with two, and the two second supports 233 are respectively arranged on the inner walls of the front and rear ends of the second installation cavity 232.

[0055] The first permanent magnet 24 and the second permanent magnet 25 have opposite surface magnetic polarities and the same size.

[0056] The magnetic conducting shell 21 is sleeved on the first stator support 22 and the second stator support 23, and is arranged opposite to the first permanent magnet 24 and the second permanent magnet 25. It can be understood that the magnetic conducting shell 21 is in close contact with the first permanent magnet 24 and the second permanent magnet 25 for conducting a magnetic field; and the magnetic conducting shell 21 has a simple manufacturing process, only needs a small-tonnage machine tool, is manufactured by a simple coiling process, has high material utilization, uniform thickness, no taper tolerance, is in close contact with the first permanent magnet 24 and the second permanent magnet 25, and has a smaller gap due to magnetic pulling force; further, the magnetic conducting shell 21 is manufactured by a simple coiling process, better magnetic conducting materials can be used, compared with a stretching machine shell, the thickness is uniform, the thickness can be increased, more materials can be selected, the magnetic conducting effect is better, and thus the magnetic efficiency can be improved, so that the driving current of the brush permanent magnet micro motor is reduced.

[0057] In the utility model, the first stator support 22 is further provided with a first installation cavity 222, and a first supporting table 223 is arranged on the inner wall of the first installation cavity 222; the first permanent magnet 24 is installed in the first installation cavity 222 and abuts against the first supporting table 223; the second stator support 23 is further provided with a second installation cavity 232, and a second supporting table 233 is arranged on the inner wall of the second installation cavity 232; the second permanent magnet 25 is installed in the second installation cavity 232 and abuts against the second supporting table 233; the magnetic conducting shell 21 is sleeved on the first stator support 22 and the second stator support 23; the first stator support 22 and the second stator support 23 can be made of plastic, the first stator support 22, the second stator support 23 and the magnetic conducting shell 21 can replace components such as a stretching machine shell, a rear end cover and a plastic embedded part, and the stator mechanism 2 is assembled by multiple components, so that the manufacturing cost of the stator mechanism 2 is reduced.

[0058] In addition, in manufacturing the first stator support 22, only the position accuracy of the first supporting table 223 needs to be ensured, so as to ensure the magnetic gap between the first permanent magnet 24 and the core winding 12; in manufacturing the second stator support 23, only the position accuracy of the second supporting table 233 needs to be ensured, so as to ensure the magnetic gap between the second permanent magnet 25 and the core winding 12; the design of the first supporting table 223 and the second supporting table 233 makes the tolerance between the first permanent magnet 24, the second permanent magnet 25 and the magnetic shell 21 accumulate towards the outer area of the first supporting table 223 and the second supporting table 233, so that the magnetic gap between the first permanent magnet 24, the second permanent magnet 25 and the core winding 12 can be reduced, the magnetic efficiency and the torque of the brush permanent magnet micro motor are improved, the driving current can be reduced, and the use amount of the permanent magnet, and / or the core, and / or the copper wire of the core winding can be reduced, energy is saved, material is reduced, the consistency of products is ensured.

[0059] Further, the magnetic gap of the brush permanent magnet micro motor with the stretched machine shell is generally 0.25-0.4mm, assuming that the magnetic gap is 0.3mm; the magnetic gap of the brush permanent magnet micro motor designed by the first supporting table 223 and the second supporting table 233 can be reduced to 0.15mm; according to the formula: F = (μ0 / 4π) * [(m1*m2) / r^2], wherein F represents the magnetic force (repulsion or attraction) between the magnets, μ0 is the magnetic permeability in vacuum (constant), m1 is the magnetic moment of the first magnet (which can be the magnetic moment of the permanent magnet), m2 is the magnetic moment of the second magnet (which can be the magnetic moment generated by the core winding, which is related to the driving current of the core winding, the core amount, the number of turns and the wire diameter of the coil), and r is the distance between the two magnets, i.e. the magnetic gap; the magnetic force is inversely proportional to the square of the magnetic gap; assuming that only the magnetic gap is changed, it can be calculated that the magnetic force F1 of the magnetic gap 0.3mm is 11.11*(μ0 / 4π)*(m1*m2), and the magnetic force F2 of the magnetic gap 0.15mm is 44.44*(μ0 / 4π)*(m1*m2), F2 is 4 times of F1, so reducing the magnetic gap can greatly improve the torque of the motor. Therefore, if the torque does not need to be improved too much, the driving current can be reduced, and the use amount of the permanent magnet (i.e. m1 is reduced), and / or the core (i.e. m2 is reduced), and / or the copper wire of the core winding (i.e. m2 is reduced) can be reduced, energy is saved, material is reduced.

[0060] In an embodiment, as shown in Figures 2 to 4 The rotor mechanism 1 further comprises a front bearing 14 and a rear bearing 15 sleeved on the motor shaft 11; it can be understood that the front bearing 14 is sleeved on the front end of the motor shaft 11, and the rear bearing 15 is sleeved on the rear end of the motor shaft 11.

[0061] The first stator support 22 is further provided with a first front arc-shaped groove 224 communicating with the first accommodating cavity 221 and a first rear arc-shaped groove 228 coaxial with the first front arc-shaped groove 224, and the second stator support 23 is further provided with a second front arc-shaped groove 234 communicating with the second accommodating cavity 231 and a second rear arc-shaped groove 238 coaxial with the second front arc-shaped groove 234; the front bearing 14 is installed in the first front arc-shaped groove 224 and the second front arc-shaped groove 234 (the front bearing 14, the first front arc-shaped groove 224 and the second front arc-shaped groove 234 are coaxially arranged); the rear bearing 15 is installed in the first rear arc-shaped groove 228 and the second rear arc-shaped groove 238 (the rear bearing 15, the first rear arc-shaped groove 228 and the second rear arc-shaped groove 238 are coaxially arranged); it can be understood that the first front arc-shaped groove 224 and the second front arc-shaped groove 234 can be two semicircular arc grooves or circular arc grooves with different proportions; the first front arc-shaped groove 224 and the second front arc-shaped groove 234 form a circular hole, and the front bearing 14 is pressed and combined in the circular hole; the first rear arc-shaped groove 228 and the second rear arc-shaped groove 238 can be two semicircular arc grooves or circular arc grooves with different proportions; the first rear arc-shaped groove 228 and the second rear arc-shaped groove 238 form a circular hole, and the rear bearing 15 is pressed and combined in the circular hole; the front bearing 14 and the rear bearing 15 can support the motor shaft 11 from both ends.

[0062] The first supporting table 223 is a first arc-shaped boss coaxial with the first front arc-shaped groove 224, and the second supporting table 233 is a second arc-shaped boss coaxial with the second front arc-shaped groove 234. Further explanation, the first arc-shaped boss and the first front arc-shaped groove 224 are coaxially arranged, the second arc-shaped boss and the second front arc-shaped groove 234 are coaxially arranged, and the mutual positions of various parts on the first stator support 22 and the second stator support 23 are within the tolerance range. The mold for manufacturing the first stator support 22 and the second stator support 23 can adopt the inlay process in the precision machining process, use the three-coordinate instrument to detect the coaxiality related dimensions of the injection molded part, and ensure the coaxiality and mutual position within the tolerance range through fine adjustment of the inlay part, so as to ensure the consistency of the magnetic gap.

[0063] In the embodiment, the first arc-shaped boss and the first front arc-shaped groove 224 are coaxially arranged, and the second arc-shaped boss and the second front arc-shaped groove 234 are coaxially arranged, so as to ensure the coaxiality among the first permanent magnet 24, the second permanent magnet 25 and the motor shaft 11. During the rotation of the motor shaft 11, the front bearing 14 and the rear bearing 15 are not easy to deform and damage. The first arc-shaped boss can ensure the magnetic gap between the first permanent magnet 24 and the iron core winding 12, and the second arc-shaped boss can ensure the magnetic gap between the second permanent magnet 25 and the iron core winding 12, so that the magnetic gap of the brush permanent magnet micro motor can be made smaller, and the efficiency of the brush permanent magnet micro motor is ensured.

[0064] In an embodiment, as shown in Figure 8 The first stator support 22 and / or the second stator support 23 can be integrally formed with the external shell of the application product, so as to enhance the fixing strength of the product, save materials, reduce the installation steps of the application product and reduce the cost of the application product.

[0065] Further, as shown in Figure 3 The motor shaft 11 is further sleeved with a gasket. The front bearing 14 and the rear bearing 15 are generally oil-containing bearings. The gasket can surround the front bearing 14 in the first front arc-shaped groove 224 and the second front arc-shaped groove 234, and can also surround the rear bearing 15 in the first rear arc-shaped groove 228 and the second rear arc-shaped groove 238. Thus, the lubricating oil of the front bearing 14 and the rear bearing 15 is surrounded, and the lubricating oil is not easy to volatilize and lose. The friction generated during the rotation of the motor shaft 11 is effectively reduced, so as to reduce the noise and prolong the service life of the brush permanent magnet micro motor.

[0066] In an embodiment, as shown in Figure 1 and Figure 2 The first permanent magnet 24 includes a first magnetic tile covering the first stator support 22, and the first magnetic tile abuts against the first arc-shaped boss. Understandably, the inner surface of the first magnetic tile is a first inner arc-shaped concave surface, which abuts against the first arc-shaped boss. The outer surface of the first magnetic tile is a first outer arc-shaped convex surface, which abuts against the magnetic guide shell 21.

[0067] The second permanent magnet 25 includes a second magnetic tile covering the second stator support 23, and the second magnetic tile abuts against the second arc-shaped boss. Understandably, the inner surface of the second magnetic tile is a second inner arc-shaped concave surface, which abuts against the second arc-shaped boss. The outer surface of the second magnetic tile is a second outer arc-shaped convex surface, which abuts against the magnetic guide shell 21.

[0068] In the embodiment, the first magnetic tile is only needed to be placed in the first installation cavity 222, and the coaxial degree with the motor shaft 11 is guaranteed by the first arc-shaped boss; the second magnetic tile is only needed to be placed in the second installation cavity 232, and the coaxial degree with the motor shaft 11 is guaranteed by the second arc-shaped boss; the magnetic attraction force of the first magnetic tile and the second magnetic tile makes the magnetic conductive shell 21 be sleeved on the first stator support 22 and the second stator support 23; the assembly operation of the brush-type permanent magnet micro motor is simple.

[0069] In an embodiment, the first installation cavity 222 on the first stator support 22 can be provided with two or more than two, and correspondingly, the first permanent magnet 24 installed in the first installation cavity 222 can also be provided with two or more than two; similarly, the second installation cavity 232 on the second stator support 23 can be provided with two or more than two, and correspondingly, the second permanent magnet 25 installed in the second installation cavity 232 can also be provided with two or more than two; the plurality of first permanent magnets 24 and the plurality of second permanent magnets 25 are distributed at intervals to meet the needs of the multi-pole brush-type micro motor.

[0070] In an embodiment, as shown in Figure 6 The magnetic conductive shell 21 includes a first magnetic shell 211 and a second magnetic shell 212 connected with the first magnetic shell 211, and a joint 213 is arranged at the connection of the first magnetic shell 211 and the second magnetic shell 212; it can be understood that the first magnetic shell 211 and the second magnetic shell 212 can be also assembled together through a clamping structure, a buckling structure or the like by the magnetic attraction force of the first magnetic tile and the second magnetic tile.

[0071] The joint 213, the first center line L1 of the first permanent magnet 24 and the second center line L2 of the second permanent magnet 25 are in the same plane. In the embodiment, the joint between the first magnetic shell 211 and the second magnetic shell 212 is in the middle of the first permanent magnet 24 and the second permanent magnet 25, which does not affect the magnetic force line of the first permanent magnet 24 and the second permanent magnet 25 from N pole to S pole; and the first magnetic shell 211 and the second magnetic shell 212 are assembled into the magnetic conductive shell 21, which is easy to sleeve the magnetic conductive shell 21 on the first stator support 22 and the second stator support 23.

[0072] In an embodiment, as shown in Figure 1 and Figure 2As shown, the first stator support 22 and the second stator support 23 are centrally symmetrically distributed about the axis of the motor shaft 11; the first brush assembly 26 and the second brush assembly 27 are centrally symmetrically distributed about the axis of the motor shaft 11; the first permanent magnet 24 and the second permanent magnet 25 are centrally symmetrically distributed about the axis of the motor shaft 11; the first bracket 223 and the second bracket 233 are centrally symmetrically distributed about the axis of the motor shaft 11; the first magnetic shell 211 and the second magnetic shell 212 are centrally symmetrically distributed about the axis of the motor shaft 11. In this embodiment, the first stator support 22 and the second stator support 23 are symmetrically designed, so that the first stator support 22 and the second stator support 23 can share a set of molds, thereby reducing the manufacturing cost of the brush-type permanent magnet micro motor; the symmetric design of the first magnetic shell 211 and the second magnetic shell 212, and the symmetric design of the first brush assembly 26 and the second brush assembly 27, further reduce the manufacturing cost of the brush-type permanent magnet micro motor.

[0073] In an embodiment, the magnetic conductive shell 21 is formed by winding a flexible magnetic conductive material (for example, an ultra-thin silicon steel strip or an A3 steel strip with a thickness of 0.05mm-0.1mm, etc.) on the first stator support 22 and the second stator support 23. In this embodiment, the magnetic conductive shell 21 is formed by winding a flexible magnetic conductive material on the first stator support 22 and the second stator support 23, which ensures the airtightness of the magnetic conductive shell 21, and the thickness of the magnetic conductive shell 21 can be adjusted according to actual needs.

[0074] In an embodiment, as shown in Figure 9 The magnetic conductive shell 21 can also be replaced by a ring-shaped magnetic conductive material with a single-side opening and a seam 213, or an integrated ring-shaped magnetic conductive material without an opening, which is sleeved on the first stator support 22 and the second stator support 23.

[0075] In an embodiment, as shown in Figure 3 and Figure 5 The first stator support 22 is provided with a first recessed groove 225 and a first protrusion 227, and the second stator support 23 is provided with a second protrusion 235 matched with the first recessed groove 225 and a second recessed groove 237 matched with the first protrusion 227; it can be understood that the first stator support 22 and the second stator support 23 are both provided with corresponding matched recessed grooves and protrusions.

[0076] As shown in Figure 7As shown, the first brush assembly 26 and the second brush assembly 27 each include a brush holder 261 and a brush body 262 mounted on the brush holder 261, the second protrusion 235 is used to press the brush holder 261 of the first brush assembly 26 in the first recessed groove 225, the first protrusion 227 is used to press the brush holder 261 of the second brush assembly 27 in the second recessed groove 237, and the brush bodies 262 of the first brush assembly 26 and the second brush assembly 27 are in contact with the commutator 13. Since it is a central symmetric design, only one set is described. It can be understood that the brush body 262 can be a flexible metal sheet directly in contact with the commutator 13, or a flexible metal sheet embedded with graphite particles, and the graphite particles are in contact with the commutator 13.

[0077] Specifically, the brush holder 261 of the first brush assembly 26 is placed in the first recessed groove 225, and the brush holder 261 of the second brush assembly 27 is placed in the second recessed groove 237; then the first stator support 22 and the second stator support 23 are assembled together, the second protrusion 235 is inserted into the first recessed groove 225 and used to press the brush holder 261 of the first brush assembly 26 in the first recessed groove 225, thereby ensuring the stability of the first brush assembly 26 mounted on the first stator support 22 and the second stator support 23, and the first protrusion 227 is inserted into the second recessed groove 237 and used to press the brush holder 261 of the second brush assembly 27 in the second recessed groove 237, thereby ensuring the stability of the second brush assembly 27 mounted on the first stator support 22 and the second stator support 23. In addition, during the assembly of the brush-type permanent magnet micro motor, the brush body 262 does not need to be adjusted, and the commutator 13 naturally presses the brush body 262, thereby further improving the convenience of the assembly of the brush-type permanent magnet micro motor. Since it is a central symmetric design, only one set is described.

[0078] In an embodiment, the contact angle between the contact surface between the first stator support 22 and the second stator support 23 and the brush body 262 is 0°-15° (i.e. by changing the depth of the first recessed groove 225 and the contact surface of the groove where the brush holder 261 is placed, the contact angle can be changed); the brush body 262 made of different materials has different bending degrees under pressure, and has different contact angles; the contact angle can be set according to actual needs, and needs to ensure the normal commutation of the brush-type permanent magnet micro motor. Since it is a central symmetric design, only one set is described.

[0079] In an embodiment, as shown in FIG. 6, the first stator support 22 and the second stator support 23 are assembled together, the second protrusion 235 is inserted into the first recessed groove 225 and used to press the brush holder 261 of the first brush assembly 26 in the first recessed groove 225, thereby ensuring the stability of the first brush assembly 26 mounted on the first stator support 22 and the second stator support 23, and the first protrusion 227 is inserted into the second recessed groove 237 and used to press the brush holder 261 of the second brush assembly 27 in the second recessed groove 237, thereby ensuring the stability of the second brush assembly 27 mounted on the first stator support 22 and the second stator support 23. Figure 3 and Figure 7As shown, the first brush assembly 26 and the second brush assembly 27 each include a latch 263 arranged on one side of the brush holder 261, which extends towards the direction of the core winding 12; each of the first recessed groove 225 and the second recessed groove 237 is provided with a card slot 226 matched with the latch 263, and the latch 263 is clamped in the card slot 226. Understandably, the second protrusion 235 presses the brush holder 261 of the first brush assembly 26 in the first recessed groove 225, and the latch 263 of the first brush assembly 26 is clamped in the card slot 226 communicated with the first recessed groove 225; the first protrusion 227 presses the brush holder 261 of the second brush assembly 27 in the second recessed groove 237, and the latch 263 of the second brush assembly 27 is clamped in the card slot 226 communicated with the second recessed groove 23, further ensuring the stability of the first brush assembly 26 and the second brush assembly 27 installed on the first stator support 22 and the second stator support 23, and the first brush assembly 26 and the second brush assembly 27 are not prone to be offset, and noise is also avoided; especially for small-size brush permanent magnet micro-motor, the side walls of the first recessed groove 225 for placing the first brush assembly 26 and the second recessed groove 237 for placing the second brush assembly 27 will be relatively thin, even zero, and the latch is more needed to fix the first brush assembly 26 and the second brush assembly 27.

[0080] In an embodiment, as shown in Figure 2 and Figure 3 As shown, the first stator support 22 and / or the second stator support 23 are provided with ventilation grooves 229, which are arranged on the side wall of the first stator support 22 close to the first front arc-shaped groove 224 and / or the first rear arc-shaped groove 228 along the direction of the motor shaft 11, and / or on the side wall of the second stator support 22 close to the second front arc-shaped groove 234 and / or the second rear arc-shaped groove 238 along the direction of the motor shaft 11. Understandably, the ventilation grooves 229 are multiple and can correspond to each other, as shown in Figure 10 As shown, after the first stator support 22 and the second stator support 23 are spliced, the corresponding ventilation grooves 229 form ventilation holes along the direction of the motor shaft 11, which communicate the first accommodating cavity 221 and the second accommodating cavity 231, ensuring the heat dissipation performance during the operation of the mover mechanism 1 and prolonging the service life of the brush permanent magnet micro-motor.

[0081] In an embodiment, as shown in Figure 5As shown, the joint surface between the first stator support 22 and the second stator support 23 is provided with a fusion protrusion 2210, and the first stator support 22 and the second stator support 23 are welded together through the fusion protrusion 2210. Understandably, the first stator support 22 and the second stator support 23 are both provided with the fusion protrusion 2210, and the first stator support 22 and the second stator support 23 can be welded in the form of ultrasonic welding.

[0082] The utility model discloses an embodiment further provides a kind of assembly method, applied to above-mentioned brush permanent magnet micro motor, comprising:

[0083] S100, the iron core winding 12 and the commutator 13 are all installed on the motor shaft 11;Specifically, first, motor shaft 11 is inserted into iron core, and insulating sheet is set on motor shaft 11, and iron core is located between two insulating sheets;Then, the commutator 13 is set on motor shaft 11;After that, enameled wire is wound on the iron core to form the iron core winding 12, and the outgoing line of the iron core winding 12 is welded on the commutator 13;After gasket is set on motor shaft 11, front bearing 14 and rear bearing 15 are respectively set on motor shaft 11, so that the assembly of the rotor mechanism 1 is completed.

[0084] S200, the first brush assembly 26 is installed on the first stator support 22, and the second brush assembly 27 is installed on the second stator support 23.

[0085] S300, the first stator support 22 and the second stator support 23 are spliced, and the rotor mechanism 1 is located in the first accommodating cavity 221 and the second accommodating cavity 231, and the first brush assembly 26 and the second brush assembly 27 are both in contact with the commutator 13;Specifically, first, the first brush assembly 26 and the second brush assembly 27 are respectively installed on the first stator support 22 and the second stator support 23;Then, the front bearing 14 of the rotor mechanism 1 is aligned and put into the first front arc-shaped groove 224 or the second front arc-shaped groove 234, and the rear bearing 15 is aligned and put into the first rear arc-shaped groove 228 or the second rear arc-shaped groove 238;Finally, the first stator support 22 and the second stator support 23 are spliced, so that the rotor mechanism 1 is located in the first accommodating cavity 221 and the second accommodating cavity 231. Because there is no permanent magnet to generate magnetic attraction force on the rotor mechanism 1, and the coaxiality is guaranteed, the assembly is more convenient, and the gap between the motor shaft 11 and the bearing hole can be reduced, and the service life of the brush permanent magnet micro motor is increased;Further, the first stator support 22 and the second stator support 23 can be fused together by ultrasonic fusion process.

[0086] S400, install the first permanent magnet 24 in the first installation cavity 222 and abut with the first supporting table 223, and install the second permanent magnet 25 in the second installation cavity 232 and abut with the second supporting table 233; specifically, after the side of the first permanent magnet 24 and the second permanent magnet 25 is coated with glue, the first permanent magnet 24 is installed in the first installation cavity 222, the side of the first permanent magnet 24 is adhered to the inner wall of the first installation cavity 222 in the direction of the motor shaft 11, and the second permanent magnet 25 is installed in the second installation cavity 232, the side of the second permanent magnet 25 is adhered to the inner wall of the second installation cavity 232 in the direction of the motor shaft 11, so that noise caused by gaps is avoided; the magnetic attraction force of the rotor mechanism and the first permanent magnet 24 and the second permanent magnet 25 further ensures that the inner surface of the first permanent magnet 24 is attached to the first supporting table 223, and the inner surface of the second permanent magnet 25 is attached to the second supporting table 233; then, according to the magnetic polarity of the installed first permanent magnet 24 and second permanent magnet 25, the positive and negative polarity of the first brush assembly 26 and the second brush assembly 27 is marked.

[0087] S400, install the first permanent magnet 24 in the first installation cavity 222 and abut with the first supporting table 223, and install the second permanent magnet 25 in the second installation cavity 232 and abut with the second supporting table 233; specifically, after the side of the first permanent magnet 24 and the second permanent magnet 25 is coated with glue, the first permanent magnet 24 is installed in the first installation cavity 222, the side of the first permanent magnet 24 is adhered to the inner wall of the first installation cavity 222 in the direction of the motor shaft 11, and the second permanent magnet 25 is installed in the second installation cavity 232, the side of the second permanent magnet 25 is adhered to the inner wall of the second installation cavity 232 in the direction of the motor shaft 11, so that noise caused by gaps is avoided; the magnetic attraction force of the rotor mechanism and the first permanent magnet 24 and the second permanent magnet 25 further ensures that the inner surface of the first permanent magnet 24 is attached to the first supporting table 223, and the inner surface of the second permanent magnet 25 is attached to the second supporting table 233; then, according to the magnetic polarity of the installed first permanent magnet 24 and second permanent magnet 25, the positive and negative polarity of the first brush assembly 26 and the second brush assembly 27 is marked.

[0088] In the utility model, the brush permanent magnet micro motor is simple in assembly operation, the tolerance between the first permanent magnet 24, the second permanent magnet 25 and the magnetic shell 21 is accumulated to the outer area of the first supporting table 223 and the second supporting table 233, so that the magnetic gap between the first permanent magnet 24, the second permanent magnet 25 and the iron core winding 12 can be reduced, the magnetic efficiency and the torque of the brush permanent magnet micro motor are improved, the driving current can be reduced, the use amount of the permanent magnet, the iron core and / or the copper wire of the iron core winding can be reduced, energy saving and material reduction are realized, and the consistency of products is ensured.

[0089] The above-described embodiments are only used to illustrate the technical scheme of the utility model, rather than limit it; although the utility model is explained in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical scheme recorded in the foregoing embodiments can be modified, or part of the technical features can be replaced equivalently; the modification or replacement does not make the essence of the corresponding technical scheme deviate from the spirit and scope of the technical scheme of the embodiments of the utility model, and should be included in the protection scope of the utility model.

Claims

1. A brush permanent-magnet micromotor, characterized by comprising: The mover mechanism and the stator mechanism are included; The mover mechanism includes a motor shaft, and an iron core winding and a commutator which are both mounted on the motor shaft; The stator mechanism includes a magnetic conductive shell, a first stator support, a second stator support, a first permanent magnet, a second permanent magnet, a first brush assembly and a second brush assembly, the first stator support is provided with a first accommodating cavity, and the second stator support is provided with a second accommodating cavity; the first stator support is mounted on the second stator support, and the mover mechanism is mounted in the first accommodating cavity and the second accommodating cavity; the first brush assembly is mounted on the first stator support, the second brush assembly is mounted on the second stator support, and the first brush assembly and the second brush assembly are both in contact with the commutator; The first stator support is further provided with a first mounting cavity which is in communication with the first accommodating cavity, and an inner wall of the first mounting cavity is provided with a first supporting table; the first permanent magnet is mounted in the first mounting cavity and abuts against the first supporting table; The second stator support is further provided with a second mounting cavity which is in communication with the second accommodating cavity, and an inner wall of the second mounting cavity is provided with a second supporting table; the second permanent magnet is mounted in the second mounting cavity and abuts against the second supporting table; The magnetic conductive shell is sleeved on the first stator support and the second stator support, and is oppositely arranged with the first permanent magnet and the second permanent magnet.

2. The brush-type permanent-magnet micromotor according to claim 1, wherein The mover mechanism further includes a front bearing and a rear bearing which are sleeved on both ends of the motor shaft; The first stator support is further provided with a first front arc-shaped groove which is in communication with the first accommodating cavity and a first rear arc-shaped groove which is coaxial with the first front arc-shaped groove, and the second stator support is further provided with a second front arc-shaped groove which is in communication with the second accommodating cavity and a second rear arc-shaped groove which is coaxial with the second front arc-shaped groove; the front bearing is mounted in the first front arc-shaped groove and the second front arc-shaped groove; The rear bearing is mounted in the first rear arc-shaped groove and the second rear arc-shaped groove; The first supporting table is a first arc-shaped boss which is coaxial with the first front arc-shaped groove, and the second supporting table is a second arc-shaped boss which is coaxial with the second front arc-shaped groove.

3. The brush-type permanent-magnet micromotor according to claim 2, wherein The first permanent magnet includes a first magnetic tile which covers the first stator support and abuts against the first arc-shaped boss; The second permanent magnet includes a second magnetic tile which covers the second stator support and abuts against the second arc-shaped boss.

4. The brush-type permanent-magnet micromotor according to claim 1, wherein The magnetic conductive shell includes a first magnetic shell and a second magnetic shell which is connected with the first magnetic shell, and a joint is arranged at the connection of the first magnetic shell and the second magnetic shell; The joint, a first middle line of the first permanent magnet and a second middle line of the second permanent magnet are in the same plane.

5. The brush-type permanent-magnet micromotor according to claim 4, wherein The first stator support and the second stator support are centrally symmetrically distributed about the axis of the motor shaft; The first brush assembly and the second brush assembly are centrally symmetrically distributed about the axis of the motor shaft; The first permanent magnet and the second permanent magnet are centrally symmetrically distributed about the axis of the motor shaft; The first support and the second support are centrally symmetrically distributed about the axis of the motor shaft; The first magnetic shell and the second magnetic shell are centrally symmetrically distributed about the axis of the motor shaft.

6. The brush-type permanent-magnet micromotor according to claim 1, wherein The magnetic guide shell is formed by winding a flexible magnetic guide material on the first stator support and the second stator support.

7. The brush-type permanent-magnet micromotor according to claim 1, wherein The first stator support is provided with a first recessed groove and a first protrusion, and the second stator support is provided with a second protrusion matched with the first recessed groove and a second recessed groove matched with the first protrusion; The first brush assembly and the second brush assembly each include a brush holder and a brush body mounted on the brush holder, and the brush body is in contact with the commutator; The first brush assembly is placed in the first recessed groove and is fixed by the second protrusion, and the second brush assembly is placed in the second recessed groove and is fixed by the first protrusion.

8. The brush-type permanent-magnet micromotor according to claim 7, wherein The first brush assembly and the second brush assembly each include a clamping tongue arranged on one side of the brush holder, and the clamping tongue extends towards the direction of the iron core winding; the first recessed groove and the second recessed groove are each provided with a clamping groove matched with the clamping tongue, and the clamping tongue is clamped in the clamping groove.

9. The brush-type permanent-magnet micromotor according to claim 1, wherein The first stator support and / or the second stator support is provided with a ventilation groove, and the ventilation groove communicates the first accommodating cavity and the second accommodating cavity.

10. The brush-type permanent-magnet micromotor according to claim 1, wherein The joint surface between the first stator support and the second stator support is provided with a fusion protrusion, and the first stator support and the second stator support are welded together through the fusion protrusion.

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