Permanent magnet brushless motor

Abstract

The utility model discloses a permanent magnet brushless motor, which comprises a fixed base, a rotating shaft, a stator iron core, coils, a rotor and permanent magnet magnetic steel, the lower end part of the rotating shaft is rotatably connected with the fixed base, the stator iron core is fixed at the upper end part of the fixed base, the stator iron core is provided with a plurality of winding parts along the circumferential direction, the coils are respectively wound on the winding parts, and the permanent magnet magnetic steel is wound on the stator iron core. The rotor rotatably covers the upper end part of the fixed base, the rotor is fixedly connected with the upper end part of the rotating shaft, the permanent magnet magnetic steels are embedded on the inner circumferential wall of the rotor at intervals along the circumferential direction, the inner circumferential walls of the permanent magnet magnetic steels are connected with the outer circumferential wall of the stator iron core at intervals, and the permanent magnet magnetic steels are respectively arranged around the stator iron core. According to the technical scheme of the utility model, the friction force during the operation of the motor is greatly reduced, the operation is smooth, the noise is effectively reduced, the output power is large, and the efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and particularly relates to a permanent magnet brushless motor. Background Art

[0002] At present, most of the existing motors on the market adopt DC brushed motors. A brushed motor is a rotating electric machine that contains a brush device and converts electrical energy into mechanical energy (motor) or mechanical energy into electrical energy (generator). However, DC brushed motors have the following defect problems:

[0003] 1. Large friction and large loss

[0004] After using the motor for a period of time, it is necessary to open the motor to clean the carbon brushes of the motor, which is time-consuming and laborious;

[0005] 2. Large heat generation and short service life

[0006] Due to the structural reasons of the brushed motor, the contact resistance between the carbon brush and the commutator is very large, resulting in a large overall resistance of the motor, which is prone to heat generation. And the permanent magnet is a thermosensitive element. If the temperature is too high, the magnet will demagnetize, which will reduce the performance of the motor and affect the service life of the brushed motor;

[0007] 3. Low efficiency and small output power

[0008] The heat generation problem of the brushed motor is largely because the electric current does work on the internal resistance of the motor. Therefore, a large amount of electrical energy is converted into heat energy. So the output power of the brushed motor is not large and the efficiency is not high. Content of the Utility Model

[0009] The main purpose of the utility model is to propose a permanent magnet brushless motor, aiming to solve the technical problems of large friction, large loss, large heat generation, short service life, low efficiency and small output power existing in the existing DC brushed motors.

[0010] To achieve the above object, the permanent magnet brushless motor proposed by the utility model includes a fixed base, a rotating shaft, a stator core, coils, a rotor and permanent magnet steel. The lower end of the rotating shaft is rotatably connected to the fixed base. The stator core is fixed to the upper end of the fixed base. The stator core is provided with a plurality of winding parts along the circumferential direction. The coils are respectively wound on the winding parts. The rotor rotatably covers the upper end of the fixed base, and the rotor is fixedly connected to the upper end of the rotating shaft. The permanent magnet steel is embedded in the inner peripheral wall of the rotor at intervals along the circumferential direction, and the inner peripheral wall of the permanent magnet steel is spaced from the outer peripheral wall of the stator core. The permanent magnet steels are respectively arranged around the stator core.

[0011] Optionally, it further includes bearings and C-shaped circlips. A through hole is recessed in the middle of the upper end portion of the fixed base. Bearing accommodation grooves are respectively recessed in the upper end portion and the lower end portion of the through hole. The bearings are respectively embedded in the bearing accommodation grooves. The bearings are respectively arranged at the lower end portion of the rotating shaft. A clamping groove is recessed in the outer peripheral wall of the lower end portion of the rotating shaft along the circumferential direction. The C-shaped circlip is detachably embedded in the clamping groove, and the C-shaped circlip is in contact with the lower end wall of the bearing.

[0012] Optionally, a plurality of limiting grooves are recessed in the inner peripheral wall of the rotor along the circumferential direction, and the permanent magnet magnetic steels are respectively embedded in the limiting grooves.

[0013] Optionally, a plurality of heat dissipation holes are recessed in the outer peripheral wall of the upper end portion of the rotor along the circumferential direction.

[0014] Optionally, a limiting step is protruded in the outer peripheral wall of the upper end portion of the fixed base along the circumferential direction, and the lower end wall of the stator core is in contact with the upper end wall of the limiting step.

[0015] Optionally, a plurality of first screw mounting holes are provided in the lower end portion of the fixed base.

[0016] Optionally, a plurality of second screw mounting holes are provided in the upper end portion of the rotor.

[0017] Adopting the technical solution of the present utility model has the following beneficial effects: In the technical solution of the present utility model, the stator core is fixed to the upper end portion of the fixed base. A plurality of winding portions are provided in the stator core along the circumferential direction, and the coils are respectively wound on the winding portions. The rotor is rotatably covered on the upper end portion of the fixed base, and the rotor is fixedly connected to the upper end portion of the rotating shaft. The permanent magnet magnetic steels are spaced along the circumferential direction and embedded in the inner peripheral wall of the rotor, and the inner peripheral wall of the permanent magnet magnetic steels is spaced from the outer peripheral wall of the stator core. Since there is no brush inside the brushless motor, the friction during operation is greatly reduced, the operation is smooth, the noise is much lower, the output power is large, and it is energy-efficient. The efficiency of the permanent magnet brushless motor is more than 20% higher than that of the traditional motor, which can better meet the requirements of energy conservation and environmental protection, has good stability and control performance, can realize speed and torque control, has a compact structure, can achieve a smaller volume and a lighter weight, is suitable for occasions requiring lightweight, has a long service life, and the service life of the permanent magnet brushless motor is longer than that of the traditional motor, which can reduce the maintenance cost and replacement cost. Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0019] Figure 1 It is a schematic diagram of the overall structure of a permanent magnet brushless motor according to an embodiment of the present invention;

[0020] Figure 2 It is a schematic diagram of the overall structure of a permanent magnet brushless motor from another perspective according to an embodiment of the present invention;

[0021] Figure 3 It is an exploded view of a permanent magnet brushless motor according to an embodiment of the present invention;

[0022] Figure 4 It is a partial exploded view of a permanent magnet brushless motor according to an embodiment of the present invention.

[0023] The realization of the object, functional features and advantages of the present invention will be further described with reference to the embodiments and the drawings. Detailed Embodiments

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0025] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0026] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0027] The present invention provides a permanent magnet brushless motor.

[0028] Such asFigures 1 to 4 As shown in Figures 1 to 4 , in an embodiment of the present utility model, the permanent magnet brushless motor includes a fixed base 101, a rotating shaft 102, a stator core 103, a coil 104, a rotor 105, and a permanent magnet 106. The lower end of the rotating shaft 102 is rotatably connected to the fixed base 101. The stator core 103 is fixed to the upper end of the fixed base 101. The stator core 103 is provided with a plurality of winding portions 1031 along the circumferential direction. The coils 104 are respectively wound around the winding portions 1031. The rotor 1015 is rotatably disposed on the upper end of the fixed base 101, and the rotor 105 is fixedly connected to the upper end of the rotating shaft 102. The permanent magnets 106 are spaced apart along the circumferential direction and embedded in the inner peripheral wall of the rotor 105, and the inner peripheral wall of the permanent magnet 106 is spaced apart from the outer peripheral wall of the stator core 103. The permanent magnets 106 are respectively disposed around the stator core 103.

[0029] Specifically, in this embodiment, it further includes a bearing 107 and a C-shaped circlip 108. A through hole 1011 is recessed in the middle of the upper end of the fixed base 101. Bearing accommodation grooves 1012 are respectively recessed in the upper and lower ends of the through hole 1011. The bearings 107 are respectively embedded in the bearing accommodation grooves 1012. The bearings 107 are respectively disposed at the lower end of the rotating shaft 102. A card slot 1021 is recessed in the outer peripheral wall of the lower end of the rotating shaft 102 along the circumferential direction. The C-shaped circlip 108 is detachably embedded in the card slot 1021, and the C-shaped circlip 108 is in contact with the lower end wall of the bearing 107. The rotating shaft is rotatably connected to the fixed base through the bearing. The C-shaped circlip makes the installation, disassembly, and maintenance of the rotating shaft more convenient and fast.

[0030] Specifically, in this embodiment, a plurality of limiting grooves 1051 are recessed in the inner peripheral wall of the rotor 105 along the circumferential direction. The permanent magnets 106 are respectively embedded in the limiting grooves 1051, making the installation of the permanent magnets more convenient and fast, and preventing them from shifting and loosening, improving the reliability and service life of the brushless motor.

[0031] Specifically, in this embodiment, a plurality of heat dissipation holes 1052 are recessed in the outer peripheral wall of the upper end of the rotor 105 along the circumferential direction, enabling the heat generated inside the motor to be quickly dissipated, preventing the temperature from being too high for a long time and affecting the performance of the motor.

[0032] Specifically, in this embodiment, a limiting step 1013 is protruded in the outer peripheral wall of the upper end of the fixed base 101 along the circumferential direction. The lower end wall of the stator core 103 is in contact with the upper end wall of the limiting step 1013, making the installation of the stator core more convenient and fast, and firm and reliable, preventing the stator core from being skewed and affecting the performance reliability of the motor.

[0033] Specifically, in this embodiment, a plurality of first screw mounting holes 1014 are provided at the lower end of the fixed base 101, facilitating the installation and fixation of the fixed base.

[0034] Specifically, in this embodiment, a plurality of second screw mounting holes 1053 are provided at the upper end of the rotor 105, facilitating the installation and fixation of the rotor to external devices.

[0035] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A permanent magnet brushless motor, characterized in that, It includes a fixed base, a rotating shaft, a stator core, coils, a rotor, and permanent magnet steel. The lower end of the rotating shaft is rotatably connected to the fixed base. The stator core is fixed to the upper end of the fixed base. The stator core is provided with a plurality of winding portions in the circumferential direction. The coils are respectively wound on the winding portions. The rotor rotatably covers the upper end of the fixed base, and the rotor is fixedly connected to the upper end of the rotating shaft. The permanent magnet steel is embedded in the inner circumferential wall of the rotor at intervals in the circumferential direction, and the inner circumferential wall of the permanent magnet steel is spaced from the outer circumferential wall of the stator core. The permanent magnet steels are respectively arranged around the stator core.

2. The brushless permanent magnet motor according to claim 1, characterized in that, It further includes bearings and C-type snap rings. A through hole is recessed in the middle of the upper end of the fixed base. A bearing accommodation groove is respectively recessed in the upper end and the lower end of the through hole. The bearings are respectively embedded in the bearing accommodation grooves. The bearings are respectively arranged at the lower end of the rotating shaft. A clamping groove is recessed in the outer circumferential wall of the lower end of the rotating shaft in the circumferential direction. The C-type snap ring is detachably embedded in the clamping groove, and the C-type snap ring is in contact with the lower end wall of the bearing.

3. The brushless permanent magnet motor according to claim 1, characterized in that, A plurality of limiting grooves are recessed in the inner circumferential wall of the rotor in the circumferential direction. The permanent magnet steels are respectively embedded in the limiting grooves.

4. The brushless permanent magnet motor according to claim 1, characterized in that A plurality of heat dissipation holes are recessed in the outer circumferential wall of the upper end of the rotor in the circumferential direction.

5. The brushless permanent magnet motor according to claim 1, wherein, A limiting step is protruded in the circumferential direction on the outer circumferential wall of the upper end of the fixed base. The lower end wall of the stator core is in contact with the upper end wall of the limiting step.

6. The brushless permanent magnet motor according to claim 1, characterized in that, A plurality of first screw mounting holes are provided at the lower end of the fixed base.

7. The brushless permanent magnet motor according to claim 1, wherein A plurality of second screw mounting holes are provided at the upper end of the rotor.

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