Direct current brushless motor

Abstract

The utility model provides a direct current brushless motor, which is applied to a cooling system of a refrigerator compressor and comprises a fan blade assembly, a driving assembly and a base assembly, the base assembly comprises a base, an annular frame and a chassis, the annular frame is installed at the top end of the base, the chassis is fixedly installed at the center position of the annular frame, and the driving assembly comprises a stator structure and a driving control panel. The fan blade assembly comprises a fan blade hub and a rotor structure, a plurality of blades are evenly connected to the outer wall of the fan blade hub, a concentric connecting shaft is installed in the fan blade hub, the stator structure is installed on the chassis and arranged in the rotor structure, and the drive control panel is fixedly installed at the end, away from the fan blade hub, of the stator structure. The output end of the driving control board is electrically connected with the stator structure through an enameled wire winding wound on the stator structure; according to the utility model, the power consumption of the motor is reduced, the working efficiency is improved, and the AC / DC conversion module is matched to realize the rapid conversion of the motor driving mode, thereby meeting different requirements.

Description

Technical Field

[0001] The utility model relates to the field of power electronics, in particular to a motor, and more particularly to a motor heat dissipation technology, specifically a brushless DC motor. Background Art

[0002] In the prior art, commercial refrigerators use AC aluminum-shell shaded-pole asynchronous motors as heat dissipation components of the compressor. However, these motors have the disadvantages of poor efficiency, bulky size, and inability to flexibly adjust the speed. Utility Model Content

[0003] The purpose of the present utility model is to provide a brushless DC motor for solving the problems pointed out in the above background technology.

[0004] The utility model provides a brushless DC motor, which is applied to the heat dissipation system of a refrigerator compressor, comprising: a fan blade assembly, a drive assembly and a base assembly, wherein the base assembly comprises a base, an annular frame and a chassis, the annular frame is mounted on the top of the base, and the chassis is fixedly mounted at the center of the annular frame, the drive assembly comprises a stator structure and a drive control board, the fan blade assembly comprises a fan blade hub and a rotor structure, the outer wall of the fan blade hub is evenly connected to a plurality of blades, a concentric connecting shaft is mounted inside the fan blade hub, the rotor structure is fixedly mounted inside the fan blade hub, the stator structure is mounted on the chassis and arranged inside the rotor structure, the drive control board is fixedly mounted on one end of the stator structure away from the fan blade hub, and the output end of the drive control board is electrically connected to the stator structure through an enameled wire winding wound on the stator structure.

[0005] In one implementation of the present invention, the rotor structure includes a hollow rotor iron shell, and a plurality of magnetic pole rotor strips are evenly installed on the inner wall of the rotor iron shell. The stator structure includes a stator plastic-coated frame arranged on the inner wall of the rotor iron shell, and a plurality of stators are evenly installed inside the stator plastic-coated frame.

[0006] In one implementation of the present invention, a bearing seat facing the fan blade is connected to the center of the chassis, a magnet block is installed at one end of the bearing seat close to the chassis, a retaining spring is fixedly sleeved on the outer wall of the magnet block, a bearing located on the inner wall of the bearing seat is installed at the outer end of the retaining spring, and openings for accommodating the connecting shaft are provided at the center of the retaining spring and the center of the magnet block, a through hole is provided at the center of the stator plastic-coated skeleton, the connecting shaft is inserted into the through hole and plugged into the inside of the bearing seat, the connecting shaft is rollingly connected to the inner wall of the bearing, and an axis buckle inserted into the inside of the retaining spring is installed at the end of the connecting shaft close to the base, so that the connecting shaft can be fixed to the chassis through the axis buckle.

[0007] In one implementation of the present invention, the input end of the drive control board is connected to an AC / DC conversion module through a power control harness, and the input end of the AC / DC conversion module is connected to a module power harness. The AC / DC conversion module is used to convert 220V AC power into 12V DC power.

[0008] In one implementation of the present invention, a chassis is installed on the outside of the AC / DC conversion module, and the side walls of the base are installed with upper and lower oppositely arranged clips, and a slot is formed between the opposite clips. A protruding clip is installed on the side of the chassis close to the clip, and the protruding clip is engaged with the slot. The chassis is fixed to the side of the base by engaging the protruding clip with the slot.

[0009] As described above, the brushless DC motor of the present invention has the following beneficial effects:

[0010] Compared with the existing technology, the brushless DC motor provided by the utility model adopts a brushless motor composed of a rotor structure and a stator structure to drive the fan blade assembly to rotate, and cooperates with the drive control board to realize the sinusoidal wave drive of the single-phase brushless motor, which not only effectively reduces the weight of the motor, reduces power consumption, and improves work efficiency, but also cooperates with the AC / DC conversion module to realize rapid conversion of the motor drive mode, realize stepless speed regulation, and improve the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Shown is an exploded view of the brushless DC motor according to an embodiment of the present invention.

[0012] Figure 2 Shown is a schematic diagram of the overall structure of the brushless DC motor according to an embodiment of the present utility model.

[0013] Figure 3 Shown is a schematic diagram of the internal cross-sectional structure of the brushless DC motor according to an embodiment of the present invention.

[0014] Figure 4 Shown is a front structural schematic diagram of the brushless DC motor according to an embodiment of the present utility model.

[0015] Figure 5 Shown is a schematic cross-sectional structure diagram of the fan blade assembly of the brushless DC motor according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0016] The following describes the embodiments of the present invention through specific examples. Those skilled in the art will readily understand the other advantages and benefits of the present invention from the disclosure herein. The present invention may also be implemented or applied through various other specific embodiments, and the details in this specification may be modified or altered based on different perspectives and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features within these embodiments may be combined with one another, unless they conflict.

[0017] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. The illustrations only show components related to the present invention and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0018] See Figures 1 to 5 The following embodiments of the present invention provide a brushless DC motor. Compared with the prior art, the brushless DC motor provided by the present invention adopts a brushless motor composed of a rotor structure and a stator structure to drive the fan blade assembly to rotate, and cooperates with the drive control board to realize the sinusoidal wave drive of the single-phase brushless motor, which not only effectively reduces the weight of the motor, reduces power consumption, and improves work efficiency, but also cooperates with the AC / DC conversion module to realize rapid conversion of the motor drive mode, realize stepless speed regulation, and improve the heat dissipation effect.

[0019] The technical solutions in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings in the embodiments of the present invention.

[0020] like Figures 1 to 5 As shown, in one embodiment, the utility model provides a brushless DC motor, which is applied to the cooling system of the refrigerator compressor, including: a fan blade assembly 1, a drive assembly 2 and a base assembly 3, the base assembly 3 including a base 31, an annular frame 32 and a chassis 33, the annular frame 32 is mounted on the top of the base 31, the chassis 33 is fixedly mounted at the center of the annular frame 32, the drive assembly 2 includes a stator structure 22 and a drive control board 21, the fan blade assembly 1 includes a fan blade hub 11 and a rotor structure 12, the fan blade A plurality of blades 15 are evenly connected to the outer wall of the hub 11, a concentric connecting shaft 13 is installed inside the fan hub 11, the rotor structure 12 is fixedly installed inside the fan hub 11, the stator structure 22 is installed on the chassis 33 and is arranged inside the rotor structure 12, the drive control board 21 is fixedly installed at one end of the stator structure 22 away from the fan hub 11, and the output end of the drive control board 21 is electrically connected to the stator structure 22 through an enameled wire winding 23 wound around the stator structure 22.

[0021] In this embodiment, the stator structure 22 is coaxially embedded and installed inside the rotor structure 21, thereby realizing brushless motor drive to drive the fan blade assembly 1 to rotate, and the drive control board 21 is electrically connected to the stator structure 22 through the enameled wire winding 23, so that the stator inside the stator structure 22 can be controlled by the drive control board 21, thereby realizing stepless speed regulation to meet different power requirements.

[0022] In one embodiment, the housing of the single-phase brushless DC motor of this invention is injection-molded with PBT. Under the same load conditions as the fan blades, power consumption is approximately 25W at 1650 RPM, and power consumption can be controlled to around 2.5W. This results in an increase in actual efficiency (the ratio of the motor's output power to its input power) from 30% to over 80%.

[0023] In one embodiment, the rotor structure 12 includes a hollow rotor iron shell 121, and a plurality of rotor magnetic strips 122 are evenly installed on the inner wall of the rotor iron shell 121. The stator structure 22 includes a stator plastic-coated frame 221 arranged on the inner wall of the rotor iron shell 211, and a plurality of stators 222 are evenly installed inside the stator plastic-coated frame 221. The center of the chassis 33 is connected to a bearing seat 36 facing the fan blade 14. A magnet block 37 is installed at one end of the bearing seat 36 close to the chassis 33. The outer wall of the magnet block 37 is fixedly sleeved with a retaining spring 34, and the outer end of the retaining spring 34 is fixedly sleeved with a retaining spring 34. A bearing 35 is installed on the inner wall of the bearing seat 36, and openings for accommodating the connecting shaft 13 are provided at the center of the retaining spring 34 and the center of the magnet block 37. A through hole 223 is provided at the center of the stator plastic-coated frame 221. The connecting shaft 13 is inserted into the through hole 223 and plugged into the inside of the bearing seat 36. The connecting shaft 13 is rollingly connected to the inner wall of the bearing 35, and the end of the connecting shaft 13 close to the base 31 is installed with a shaft buckle 14 inserted into the inside of the retaining spring 34, so that the connecting shaft 13 can be fixed to the chassis 33 through the shaft buckle 14.

[0024] In this embodiment, due to the bearing seat 36 installed at the center of the chassis 33, the connecting shaft 13 connected at the center of the fan hub 11 is passed through the through hole 223 at the center of the stator plastic-coated frame 221, inserted into the bearing 35 and passed through the retaining spring 34 and the magnet block 37 in sequence, and the entire connecting shaft 13 is fixedly installed on the chassis 33 using the shaft buckle 14. The connecting shaft 13 rotates normally under the action of the bearing 35, thereby achieving the stability of the entire fan blade assembly 1 during rotation, so that the fan blade assembly 1 will not loosen during rotation.

[0025] In one embodiment, the input of the drive control board 21 is connected to an AC / DC converter module 5 via a power control harness 4. The input of the AC / DC converter module 5 is connected to a module power harness 6. The AC / DC converter module 5 is used to convert 220V AC power to 12V DC power. The addition of the AC / DC converter module 5 facilitates the conversion of 220V AC power to 12V DC power, enabling flexible switching of motor drive modes to meet different operating requirements.

[0026] Existing motors generally only operate with 220V AC. The single-phase brushless DC motor of the present invention switches between 220V AC and 12V DC modes by adding an AC / DC converter module 5. When the motor is driven in 220V AC mode, it can be powered by the refrigerator's power supply. When the motor is driven in 12V DC mode, it can be powered by the refrigerator's own LED lighting system, which operates at a 12V level and is suitable for driving the brushless DC motor.

[0027] In one embodiment, the drive control board 21 in the solution of the present invention adopts a dedicated M8120 control chip. This chip adopts 12V DC drive and can realize stepless speed regulation by using simple PWM (pulse width modulation signal) duty cycle modulation or level signal within 5V. For the circuit system of the refrigerator host, the speed regulation scheme is simpler to implement.

[0028] In one embodiment, a chassis 51 is installed on the outside of the AC / DC conversion module 5, and the side walls of the base 31 are installed with upper and lower oppositely arranged clips 311, and a slot 312 is formed between the opposite clips 311. A protruding clip 52 is installed on the side of the chassis 51 close to the clip 311, and the protruding clip 52 is engaged with the slot 312. The chassis 51 is fixed to the side of the base 31 by engaging with the protruding clip 52 and the slot 312.

[0029] In this embodiment, since a slot 312 is formed between the upper and lower latches 311 arranged opposite to each other on the outer wall of the base 31, by inserting the protruding latch 52 into the slot 312, the chassis 51 of the entire AC / DC conversion module 5 can be fixed to the side of the base 31, which is convenient for subsequent disassembly and maintenance.

[0030] It should be noted that the brushless DC motor provided by the present invention adopts a brushless motor composed of a rotor structure and a stator structure to drive the fan blade assembly to rotate, and cooperates with the drive control board to realize the sinusoidal wave drive of the single-phase brushless motor, which not only effectively reduces the weight of the motor, reduces power consumption, and improves work efficiency, but also cooperates with the AC / DC conversion module to realize rapid conversion of the motor drive mode, realize stepless speed regulation, and improve the heat dissipation effect.

[0031] The descriptions of the processes or structures corresponding to the above figures have different emphases. For parts that are not described in detail in a certain process or structure, please refer to the relevant descriptions of other processes or structures.

[0032] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

Claims

1. A brushless DC motor, used in a refrigerator compressor cooling system, characterized in that: include: A fan blade assembly, a drive assembly and a base assembly, wherein the base assembly includes a base, an annular frame and a chassis, the annular frame is installed at the top of the base, and the chassis is fixedly installed at the center of the annular frame. The drive assembly includes a stator structure and a drive control board. The fan blade assembly includes a fan blade hub and a rotor structure. The outer wall of the fan blade hub is evenly connected with multiple blades, and a concentric connecting shaft is installed inside the fan blade hub. The rotor structure is fixedly installed inside the fan blade hub, the stator structure is installed on the chassis and arranged inside the rotor structure, and the drive control board is fixedly installed at one end of the stator structure away from the fan blade hub, and the output end of the drive control board is electrically connected to the stator structure through an enameled wire winding wound on the stator structure.

2. The brushless DC motor according to claim 1, wherein: The rotor structure includes a hollow rotor iron shell, and a plurality of magnetic pole rotor strips are evenly installed on the inner wall of the rotor iron shell. The stator structure includes a stator plastic-coated frame arranged on the inner wall of the rotor iron shell, and a plurality of stators are evenly installed inside the stator plastic-coated frame.

3. The brushless DC motor according to claim 2, wherein: A bearing seat facing the fan blade is connected to the center of the chassis, a magnet block is installed at one end of the bearing seat close to the chassis, a retaining spring is fixedly sleeved on the outer wall of the magnet block, a bearing located on the inner wall of the bearing seat is installed at the outer end of the retaining spring, and openings for accommodating the connecting shaft are provided at the center of the retaining spring and the center of the magnet block, a through hole is provided at the center of the stator plastic-coated skeleton, the connecting shaft is inserted into the through hole and plugged into the inside of the bearing seat, the connecting shaft is rollingly connected to the inner wall of the bearing, and a shaft buckle inserted into the retaining spring is installed at the end of the connecting shaft close to the base, so that the connecting shaft can be fixed to the chassis through the shaft buckle.

4. The brushless DC motor according to claim 1, wherein: The input end of the drive control board is connected to an AC / DC conversion module through a power control harness, and the input end of the AC / DC conversion module is connected to a module power harness. The AC / DC conversion module is used to convert 220V AC power into 12V DC power.

5. The brushless DC motor according to claim 4, characterized in that: A chassis is installed on the outside of the AC / DC conversion module, and the side walls of the base are installed with upper and lower oppositely arranged clips, and a slot is formed between the opposite clips. A protruding clip is installed on the side of the chassis close to the clip, and the protruding clip is engaged with the slot. The chassis is fixed to the side of the base by the protruding clip and the slot.

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