Holder brushless motor

Abstract

The utility model discloses a cradle head brushless motor, which comprises a casing, a ventilation mechanism is fixedly connected to the outer side of the casing, a base is fixedly connected to the bottom of the casing, driving mechanisms are arranged in the casing and the base, the ventilation mechanism comprises a ring seat, the ring seat is fixedly connected to the outer side of the casing, and the ring seat is fixedly connected to the outer side of the casing. The bottom of the ring seat is rotationally connected with a partition plate, the inner wall of the partition plate is matched with the outer side of the machine shell in an extrusion mode, the inner side of the machine shell is fixedly connected with an inner seat, the side, close to the machine shell, of the inner seat is fixedly connected with a protruding block, and the side, away from the inner seat, of the protruding block is fixedly connected with a bimetallic strip. According to the cradle head brushless motor disclosed by the utility model, the magnetic encoder plate is additionally arranged outside the casing, so that the axial distance range of the motor can be enlarged, and the effects of greatly reducing the production difficulty and improving the production qualification rate are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a brushless motor for a pan / tilt platform. Background Art

[0002] The brushless motors for pan / tilts on the market usually use Hall brushless motors, which can accurately locate the rotation angle of the motor by changing the magnetic field strength, so as to achieve the self-stabilization state of the equipment. However, since the cumulative axial dimension tolerance of this type of Hall brushless motors is within a certain range during mass production, there will be a certain distance deviation between the magnet and the Hall, and the distance between the Hall and the magnet will cause the Hall to misjudge the magnetic field strength, thereby reducing the self-stabilization accuracy, and in severe cases, the function will fail. Therefore, the production of this type of motor is extremely difficult and the production process requirements are extremely high.

[0003] For example, the utility model with application number CN204392049U discloses a brushless motor for an aircraft gimbal with good heat dissipation, including a cylindrical casing with openings at both ends, a stator being arranged in the casing, a plurality of permanent magnets distributed along the circumferential direction being arranged between the casing and the stator, a base being arranged at one axial end of the casing, an end cover being arranged at the other axial end of the casing, a circuit board for inputting control signals to the stator being arranged between the base and the casing; the base having a bottom wall, a side wall located at the circumferential portion of the bottom wall and a mounting boss located at the central portion of the bottom wall, an axial ventilation hole being arranged on the bottom wall, radial ventilation holes and an opening for the circuit board to extend out being arranged on the side wall, an axially penetrating mounting hole being arranged in the center of the bottom wall and the mounting boss, a motor shaft and bearings sleeved on both ends of the motor shaft being arranged in the mounting hole; the end cover having a top wall and a circumferential wall located at the circumferential portion of the top wall, a weight-reducing hole being arranged on the top wall of the end cover.

[0004] Similar to the above application, there are still the following deficiencies: there is a certain distance deviation between the magnet and the Hall, and the distance between the Hall and the magnet causes the Hall to misjudge the magnetic field strength. Utility Model Content

[0005] The utility model discloses a brushless motor for a pan / tilt platform, aiming to solve the technical problems that a certain distance deviation between a magnet and a Hall is present and the distance between the Hall and the magnet causes the Hall to misjudge the magnetic field intensity.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A gimbal brushless motor comprises a casing, the outer side of the casing is fixedly connected to a ventilation mechanism, the ventilation mechanism comprises a ring seat, the ring seat is fixedly connected to the outer side of the casing, the bottom of the ring seat is rotatably connected to a baffle plate, the bottom of the casing is fixedly connected to a base, a driving mechanism is arranged inside the casing and the base, the driving mechanism comprises a magnetic encoder plate, the top of the magnetic encoder plate is fixedly connected to a magnetic sheet.

[0008] In a preferred embodiment, the inner wall of the baffle plate is squeezed and fitted with the outer side of the casing, the inner side of the casing is fixedly connected to an inner seat, the inner seat is fixedly connected to a protrusion on the side close to the casing, and the protrusion is fixedly connected to a bimetallic strip on the side away from the inner seat.

[0009] In a preferred solution, a magnetic sheet frame is installed on the top of the magnetic sheet, and the magnetic sheet frame is fixedly connected to the bottom of the inner cavity of the base.

[0010] Through the principle of electromagnetic induction and electronic technology, that is, the magnetic field is driven to rotate by alternating the magnetic poles of the stator. Since this type of Hall brushless motor has a certain range of cumulative axial size tolerance during mass production, there will be a certain distance deviation between the magnet and the Hall, and the distance between the Hall and the magnet will cause the Hall to misjudge the magnetic field strength, thereby reducing the self-stabilization accuracy, and in severe cases, the function fails.

[0011] In a preferred solution, a convex tube is fixedly installed on the top of the base, a No. 1 bearing is fixedly connected to the inside of the convex tube, and a central axis is extruded and adapted at the center of the No. 1 bearing.

[0012] In a preferred solution, a permanent magnet is rotatably connected to the inner wall of the casing, and a stator is provided on a side of the permanent magnet away from the casing.

[0013] In a preferred solution, the center part of the stator is fixedly connected with a No. 2 bearing and a No. 3 bearing respectively, and the center parts of the No. 2 bearing and the No. 3 bearing are extruded and adapted to the central axis, and the central axis is fixedly connected to the top of the inner cavity of the casing.

[0014] From the above, it can be seen that the brushless motor of the pan / tilt head has the following improvements and advantages compared with the prior art:

[0015] First, by removing the built-in Hall plate and adding a magnetic encoder plate outside the housing, the axial distance range of the motor can be increased, which greatly reduces the production difficulty and improves the production qualification rate. In addition, the sensitivity of magnetic encoding telecommunication feedback is higher than that of Hall, so the self-stabilization effect is better.

[0016] Secondly, the bimetallic strip is bent by heat, so that the bent bimetallic strip will squeeze the baffle plate outward. At this time, the baffle plate connected to the bottom of the ring seat will be deflected outward and a gap will be generated, so that the outside world is connected to the inside of the casing, thereby playing a role in heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of the brushless motor for the pan / tilt platform proposed in the utility model.

[0018] Figure 2 This is a partial structural diagram of the pan-tilt brushless motor proposed in the utility model.

[0019] Figure 3 This is a cross-sectional structural diagram of the pan-tilt brushless motor proposed in the utility model.

[0020] Figure 4 This is a schematic diagram of the internal structure of the brushless motor for the pan / tilt platform proposed in the present invention.

[0021] In the accompanying drawings: 1. casing; 2. ventilation mechanism; 3. base; 4. driving mechanism; 21. ring seat; 22. baffle plate; 23. bimetallic strip; 24. convex block; 25. inner seat; 41. magnetic encoder plate; 42. magnetic sheet; 43. magnetic sheet frame; 44. convex tube; 45. bearing No. 1; 46. center axis; 47. bearing No. 2; 48. stator; 49. permanent magnet; 40. bearing No. 3. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0023] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0024] The brushless motor for the pan / tilt head disclosed in the utility model is mainly used in scenarios where there is a certain distance deviation between the magnet and the Hall and the distance between the Hall and the magnet causes the Hall to misjudge the magnetic field strength.

[0025] Reference Figure 1 and Figure 2 The gimbal brushless motor comprises a casing 1, a ventilation mechanism 2 is fixedly connected to the outer side of the casing 1, the ventilation mechanism 2 comprises a ring seat 21, the ring seat 21 is fixedly connected to the outer side of the casing 1, a baffle plate 22 is rotatably connected to the bottom of the ring seat 21, a base 3 is fixedly connected to the bottom of the casing 1, a driving mechanism 4 is arranged inside the casing 1 and the base 3, the driving mechanism 4 comprises a magnetic encoder plate 41, a magnetic sheet 42 is fixedly connected to the top of the magnetic encoder plate 41.

[0026] The inner wall of the baffle plate 22 is pressed and adapted to the outer side of the housing 1. The inner side of the housing 1 is fixedly connected with an inner seat 25. The side of the inner seat 25 close to the housing 1 is fixedly connected with a protrusion 24. The side of the protrusion 24 away from the inner seat 25 is fixedly connected with a bimetallic strip 23. In addition, when the permanent magnet 49 rotates around the stator 48, the current passes through the winding and generates heat. Especially under high load, long-term operation or high ambient temperature, heat will accumulate in the housing 1. At this time, the accumulated heat will float on the bimetallic strip 23, wherein the bimetallic strip 23 is made of brass and steel, and it will bend to a certain extent when the temperature change is small or at a temperature below 40°C. Then the bent bimetallic strip 23 will squeeze the baffle plate 22 outward, and the baffle plate 22 rotatingly connected to the bottom of the ring seat 21 will deflect outward and generate a gap, so that the outside world is connected to the inside of the housing 1, thereby playing a role in heat dissipation.

[0027] Reference Figure 3 and Figure 4 In a preferred embodiment, a magnetic sheet frame 43 is installed on the top of the magnetic sheet 42, and the magnetic sheet frame 43 is fixedly connected to the bottom of the inner cavity of the base 3. A convex tube 44 is fixedly installed on the top of the base 3. A No. 1 bearing 45 is fixedly connected inside the convex tube 44. The center of the No. 1 bearing 45 is squeezed and adapted with a central axis 46. The inner wall of the housing 1 is rotatably connected with a permanent magnet 49. A stator 48 is arranged on the side of the permanent magnet 49 away from the housing 1. The permanent magnet 49 is driven to rotate by the principle of electromagnetic induction and electronic technology, that is, the magnetic poles of the stator 48 are alternately generated to generate a magnetic field to drive the permanent magnet 49 to rotate. Since this type of Hall brushless motor has a certain range of cumulative axial dimension tolerance during mass production, there will be a certain distance deviation between the magnet and the Hall and the distance between the Hall and the magnet, which causes the Hall to misjudge the magnetic field strength, thereby reducing the self-stabilization accuracy, and in severe cases, functional failure occurs. Therefore, the production of this type of motor is extremely difficult and the production process requirements are extremely high. Therefore, the internal structure is adjusted, the built-in Hall plate is cancelled, and a magnetic encoder plate 41 is added to the outside of the housing 1. The axial distance range of the motor can be increased, which greatly reduces the production difficulty and improves the production qualification rate. The magnetic encoding telecommunication feedback sensitivity is higher than the Hall, so the self-stabilization effect is better. The center parts of the stator 48 are respectively fixedly connected with the second bearing 47 and the third bearing 40. The center parts of the second bearing 47 and the third bearing 40 are both extruded and adapted with the central shaft 46. The central shaft 46 is fixedly connected to the top of the inner cavity of the casing 1.

[0028] Working principle: When in use, based on the principle of electromagnetic induction and electronic technology, the magnetic field is generated by alternating the magnetic poles of the stator 48 to drive the permanent magnet 49 to rotate. Usually, the brushless motor has several stators 48 and one permanent magnet 49, each stator 48 has several coils, and each adjacent pole of the coil has a magnet.

[0029] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited to this. The replacement can be a replacement of part of the structure, device, method step, or a complete technical solution. Equivalent replacement or change based on the technical solution of the utility model and its utility model concept should be included in the protection scope of the utility model.

Claims

1. A brushless motor for a pan / tilt head, comprising a housing (1), characterized in that: The outer side of the casing (1) is fixedly connected to a ventilation mechanism (2), the ventilation mechanism (2) comprises a ring seat (21), the ring seat (21) is fixedly connected to the outer side of the casing (1), the bottom of the ring seat (21) is rotatably connected to a baffle plate (22), the bottom of the casing (1) is fixedly connected to a base (3), the casing (1) and the base (3) are both provided with a driving mechanism (4), the driving mechanism (4) comprises a magnetic encoder plate (41), the top of the magnetic encoder plate (41) is fixedly connected to a magnetic sheet (42).

2. The brushless motor for a pan / tilt head according to claim 1, characterized in that: The inner wall of the baffle plate (22) is pressed and matched with the outer side of the casing (1).

3. The brushless motor for the pan / tilt head according to claim 2, characterized in that: An inner seat (25) is fixedly connected to the inner side of the housing (1), a side of the inner seat (25) close to the housing (1) is fixedly connected to a protrusion (24), and a side of the protrusion (24) away from the inner seat (25) is fixedly connected to a bimetallic strip (23).

4. The brushless motor for a pan / tilt head according to claim 1, characterized in that: A magnetic sheet frame (43) is installed on the top of the magnetic sheet (42), and the magnetic sheet frame (43) is fixedly connected to the bottom of the inner cavity of the base (3).

5. The brushless motor for the pan / tilt head according to claim 4, characterized in that: A convex tube (44) is fixedly mounted on the top of the base (3), a No. 1 bearing (45) is fixedly connected inside the convex tube (44), and a central shaft (46) is extruded and adapted at the center of the No. 1 bearing (45).

6. The brushless motor for a pan / tilt head according to claim 1, characterized in that: A permanent magnet (49) is rotatably connected to the inner wall of the casing (1), and a stator (48) is provided on a side of the permanent magnet (49) away from the casing (1).

7. The brushless motor for a pan / tilt head according to claim 6, characterized in that: The center portion of the stator (48) is fixedly connected to a No. 2 bearing (47) and a No. 3 bearing (40), respectively. The center portions of the No. 2 bearing (47) and the No. 3 bearing (40) are both extruded and adapted to a central shaft (46), and the central shaft (46) is fixedly connected to the top of the inner cavity of the casing (1).

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