Simple and reliable brushless direct current motor

Abstract

The utility model relates to a simple and reliable brushless direct current motor, and belongs to the technical field of motors. The brushless direct current motor comprises a shell assembly, a stator assembly and a rotor assembly, the shell assembly comprises an upper cover and a lower base, the stator assembly and the rotor assembly are installed in the lower base of the shell assembly, and a plurality of positioning limiting columns and curved spring pieces are arranged in the lower base to position the stator assembly. The butt joint edges of the upper cover and the lower base are connected and fixed through laser welding. The brushless direct current motor designed by the utility model is simple and compact in structure and good in sealing effect.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a simple and reliable brushless DC motor. Background Art

[0002] Brushless DC motor is a typical mechatronics product with advantages such as fast response and large starting torque. It also has the ability to provide speed from zero to rated speed. It is widely used in automobiles, ships and other switches and displacement mechanical electrical structures. At present, the common disadvantages of brushless DC motors that have been listed and publicly reported in China are:

[0003] The motor has a complex structural design, complicated overall manufacturing and assembly processes, and low production efficiency;

[0004] The motor housing needs to be made separately during the production process, which results in high production costs;

[0005] The motor makes a lot of noise when it is working;

[0006] The dustproof, waterproof and especially fireproof effects are poor. Summary of the invention

[0007] In order to solve the problems in the prior art, the utility model patent designs a simple and reliable brushless DC motor to solve the problems of high production cost and unsatisfactory use effect of the existing brushless DC motor.

[0008] The technical solution adopted by the utility model is: the brushless DC motor includes a shell assembly, a stator assembly and a rotor assembly, the shell assembly includes an upper cover and a lower seat, the stator assembly and the rotor assembly are installed in the lower seat cavity of the shell assembly, a plurality of positioning limit columns and curved spring sheets are arranged in the lower seat to position the stator assembly, and the butt edges of the upper cover and the lower seat are connected and fixed by laser welding.

[0009] Furthermore, the stator assembly includes an upper stator frame, a lower stator frame, multiple groups of stator cores and copper coils, the multiple groups of stator cores and copper coils are arranged in a ring shape and fixed between the upper stator frame and the lower stator frame, a copper conductor is arranged in the upper stator frame and connected to the copper coil, and the rotor assembly is arranged at the center of the stator assembly.

[0010] Furthermore, the control circuit PCB board of the brushless DC motor is installed and fixed at one end inside the lower seat, and the lower seat is embedded with a lower fisheye needle row at the installation position of the control circuit PCB board, and the two ends of the lower fisheye needle row are respectively connected to the control circuit PCB board and the external socket, and the stator upper frame is embedded with a quick-insert fisheye needle on one side close to the control circuit PCB board, and the two ends of the quick-insert fisheye needle are respectively connected to the control circuit PCB board and the copper conductor.

[0011] Furthermore, the rotor assembly includes a rotor gear shaft and a rotor permanent magnet ring, the rotor permanent magnet ring is fixedly sleeved on the bottom of the rotor gear shaft, the rotor gear shaft is rotatably connected to the positioning shaft core at the axis center, the top of the rotor gear shaft is an integrally formed output gear, and the bottom of the positioning shaft core is fixedly connected to or integrally formed with the lower seat.

[0012] Furthermore, a transition bracket is arranged between the lower seat and the upper cover, and the transition bracket is arranged side by side with the control circuit PCB board to cover the stator assembly and the rotor assembly. The bottom of the transition bracket is fixedly connected to the positioning limit column of the lower seat, and an opening is provided at the center of the transition bracket to expose part of the output gear on the top of the rotor gear shaft.

[0013] Furthermore, two ends of the outer side of the lower seat are respectively provided with an external socket and an external fixing bracket, and the external socket is used to connect an external power source and the input and output of a motor control signal.

[0014] Compared with the prior art, the simple and reliable brushless DC motor designed by the utility model has the following advantages:

[0015] 1. Long service life: The electrical part of the entire brushless DC motor is in the cavity formed by the lower base and the upper cover, and there is no additional motor casing, so the heat dissipation effect is good and it is not easy to age.

[0016] 2. Safe and reliable: The lower base and upper cover of the brushless DC motor are connected by laser welding technology, which has good sealing effect, no pollution to the outside world, and is dustproof, waterproof and fireproof.

[0017] 3. Low working energy consumption: The structure of the entire brushless DC motor is simple and compact, with no redundant moving or rotating parts and low friction energy consumption.

[0018] 4. Easy installation and maintenance: The entire brushless DC motor can be installed once and used for life, without the need for overhaul and maintenance during use.

[0019] 5. Low working noise: A transition bracket is added to the upper side of the rotor and stator assembly inside the brushless DC motor to form a cavity between it and the upper cover, which increases the sound insulation effect and reduces the working noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view structural diagram of a brushless DC motor.

[0021] Figure 2 yes Figure 1 Schematic diagram of the front view structure after removing the upper cover.

[0022] Figure 3It is a front view structural diagram of the stator assembly and rotor assembly inside the brushless DC motor.

[0023] Figure 4 It is a schematic diagram of the A-axis cross-sectional structure of a brushless DC motor.

[0024] In the figure, 1 is the lower seat, 2 is the upper cover, 3 is the transition bracket, 4 is the external socket, 5 is the external fixing bracket, 11 is the positioning limit column, 12 is the curved spring, 13 is the lower fisheye needle row, 6 is the stator assembly, 61 is the stator upper frame, 62 is the stator lower frame, 63 is the stator core, 64 is the copper coil, 65 is the quick-insert fisheye needle, 7 is the rotor assembly, 71 is the rotor gear shaft, 72 is the rotor permanent magnet ring, 73 is the positioning shaft core, 74 is the output gear, and 8 is the control circuit PCB board. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments. The technical solutions in the embodiments of the utility model are clearly and completely described, and the described embodiments are only embodiments of a part of the invention, not all of it. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention.

[0026] like Figure 1 , 2 As shown in Figures 3 and 4, the utility model patent designs an embodiment of a simple and reliable brushless DC motor. In this embodiment, the brushless DC motor includes a housing assembly, a stator assembly 6, a rotor assembly 7 and a control circuit PCB board 8. The housing assembly includes an upper cover 1 and a lower seat 2. The stator assembly 6, the rotor assembly 7 and the control circuit PCB board 8 are installed in the lower seat 2 of the housing assembly. The lower seat 2 is provided with a plurality of positioning limit columns 11 and a curved spring sheet 12 to position the stator assembly 6. At the same time, the control circuit PCB board 8 is fixed by the positioning limit columns 11 of the lower seat 2 and the positioning guide columns on the inner side of the upper cover 2. The control circuit PCB board 8 is installed at one end of the inner side of the lower seat 2, and a transition bracket 3 is also fixed next to it. The transition bracket 3 covers the stator assembly 6 and the rotor assembly 7 on the lower side and positions the components of the rotor assembly 7. The lower seat 1, the upper cover 2 and the transition bracket 3 are all made of high-strength, high-toughness and wear-resistant non-metallic materials through precision thermoplastic molding and subsequent machining processes. The butt edges of the upper cover 2 and the lower seat 1 are connected and fixed by laser welding.

[0027] The stator assembly 6 of the motor includes an upper stator frame 61, a lower stator frame 62, multiple groups of stator cores 63 and copper coils 64. The stator core 63 is made of silicon steel sheets of a certain shape, thickness and quantity, and the multiple groups of stator cores 63 and copper coils 64 are arranged in a ring and fixed between the upper stator frame 61 and the lower stator frame 62. The upper stator frame 61 and the lower stator frame 62 are respectively thermoplastic-molded by non-metallic insulating materials. Three copper conductors are embedded in the upper stator frame 61 and connected to the copper coils 64. The upper stator frame 61 is embedded with a quick-insert fisheye needle 65 on the side close to the control circuit PCB board 8, and the two ends of the quick-insert fisheye needle 65 are respectively connected to the control circuit PCB board 8 and the copper conductor.

[0028] The rotor assembly 7 of the motor is arranged at the center of the stator assembly 6, and includes a rotor gear shaft 71 and a rotor permanent magnet ring 72. The rotor permanent magnet ring 72 is made by sintering (or bonding) process, has a certain magnetic pole and magnetic field strength, and is a hollow cylindrical shape with concentric inner and outer circles. The rotor permanent magnet ring 72 is fixedly sleeved on the bottom of the rotor gear shaft 71 by interference fit and hot riveting process to form a rotor body. The top of the rotor gear shaft 71 is an integrally formed output gear 74, and a part of the output gear 74 is exposed from the opening in the center of the transition bracket 3, which is used for gear connection to the external reduction gear to output power outward. The axis of the rotor gear shaft 72 is rotatably connected to the positioning shaft core 73, and the bottom of the positioning shaft core 73 is fixedly connected or integrally formed with the lower seat 1.

[0029] The control circuit PCB board 8 of the motor is composed of a variety of electronic components and fixing plates for controlling the operation of the motor, and is provided with fisheye pin sockets for input and output. An external socket 4 and an external fixing bracket 5 are respectively provided at the two ends of the outer side of the lower seat 1. The external socket 4 can be quickly connected with an external power supply and an electrical signal connector to realize the input and output of power supply and control signals. The lower seat 1 is embedded with a lower fisheye pin row 13 at the installation position of the control circuit PCB board 8, and the two ends of the lower fisheye pin row 13 are respectively connected to the control circuit PCB board 8 and the external socket 4. The external fixing bracket 5 is used for the installation and fixation of the motor with the outside world.

[0030] When the simple and reliable brushless DC motor disclosed in the utility model patent is used, first, the electric energy and control signal given by the external controller of the motor are transmitted to the control circuit PCB board 8 inside the motor through the external socket 4 of the lower seat 1 and the lower fisheye needle row 13 embedded in the lower seat 1. The control circuit PCB board 8 processes and converts the electric energy and signal, and then transmits it to the copper coil 64 of the stator assembly through the copper quick-insert fisheye needle 65 embedded in the stator upper frame 61. The stator copper coil 64 generates a magnetic field after being energized. The rotor permanent magnet ring 72 of the motor generates torque under the action of the magnetic field, driving the rotor gear shaft 71 to rotate. The rotating output gear 74 then drives the external gear mechanism that cooperates with it to rotate. Finally, the rotating external gear mechanism drives the external mechanism to work.

[0031] The above contents are only preferred embodiments of the present invention and cannot be used to limit the scope of implementation of the present invention. That is, any simple equivalent changes and modifications made according to the claims and description of the present invention are still within the scope of the present invention.

Claims

1. A simple and reliable brushless DC motor, characterized in that: The brushless DC motor includes a housing assembly, a stator assembly and a rotor assembly. The housing assembly includes an upper cover and a lower seat. The stator assembly and the rotor assembly are installed in the lower seat cavity of the housing assembly. The lower seat is provided with a plurality of positioning limit columns and curved spring sheets to position the stator assembly. The butt edges of the upper cover and the lower seat are connected and fixed by laser welding.

2. A simple and reliable brushless DC motor according to claim 1, characterized in that: The stator assembly includes an upper stator frame, a lower stator frame, multiple groups of stator cores and copper coils. The multiple groups of stator cores and copper coils are arranged in a ring shape and fixed between the upper stator frame and the lower stator frame. A copper conductor is arranged in the upper stator frame and connected to the copper coil. The rotor assembly is arranged at the center of the stator assembly.

3. A simple and reliable brushless DC motor according to claim 2, characterized in that: The control circuit PCB board of the brushless DC motor is installed and fixed at one end inside the lower seat. The lower seat is embedded with a lower fisheye needle row at the installation position of the control circuit PCB board. The two ends of the lower fisheye needle row are respectively connected to the control circuit PCB board and the external socket. The stator upper frame is embedded with a quick-insert fisheye needle on one side close to the control circuit PCB board. The two ends of the quick-insert fisheye needle are respectively connected to the control circuit PCB board and the copper conductor.

4. A simple and reliable brushless DC motor according to claim 3, characterized in that: The rotor assembly includes a rotor gear shaft and a rotor permanent magnet ring. The rotor permanent magnet ring is fixedly sleeved on the bottom of the rotor gear shaft. The axis of the rotor gear shaft is rotatably connected to the positioning shaft core. The top of the rotor gear shaft is an integrally formed output gear, and the bottom of the positioning shaft core is fixedly connected to or integrally formed with the lower seat.

5. A simple and reliable brushless DC motor according to claim 4, characterized in that: A transition bracket is arranged between the lower seat and the upper cover, and the transition bracket is arranged side by side with the control circuit PCB board to cover the stator assembly and the rotor assembly.

6. A simple and reliable brushless DC motor according to claim 5, characterized in that: An external socket and an external fixing bracket are respectively arranged at two ends of the outer side of the lower seat.

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