brushless DC motors

Abstract

The present invention discloses a brushless DC motor, comprising a motor housing, a sealing hole being formed in the middle portion of the right side of the motor housing, a second bearing hole being formed on the right side of the motor housing near the left side of the sealing hole, the sealing hole being interference-fitted with a test box cover, a through hole being formed in the middle portion of the test box cover, the through hole being sleeved with the right end of the motor shaft, the motor shaft being fixedly connected to the inner ring of a first deep groove bearing near the left side of the test box cover, the first deep groove bearing being interference-fitted with the sealing hole, and a five-seven spacer being interference-fitted with the left side of the first deep groove bearing in the motor housing. The brushless DC motor, through the provision of a motor back cover, a stator, and a motor housing, directly exposes a large portion of the stator to the air without being enclosed by the motor housing and the motor back cover. When the motor generates heat during operation, the heat can be directly dissipated into the air, thereby achieving the purpose of rapid heat dissipation of the motor. At the same time, the motor can be effectively kept at an excellent operating temperature, thereby having extremely high operating stability.

Description

Technical Field

[0001] The present invention relates to the technical field of brushless DC motors, in particular to brushless DC motors. Background Art

[0002] A brushless DC motor, consisting of a motor and a driver, is a typical mechatronic product. The motor's stator windings are typically connected in a three-phase symmetrical star configuration, much like a three-phase asynchronous motor. The motor's rotor is attached to a magnetized permanent magnet, and a position sensor is installed to detect the rotor's polarity. The driver, comprised of power electronics and integrated circuits, performs the following functions: receiving start, stop, and brake signals to control the motor's starting, stopping, and braking; receiving position sensor signals and forward and reverse rotation signals to control the switching of the inverter bridge's power transistors to generate continuous torque; receiving speed commands and feedback signals to control and adjust the speed; and providing protection and display functions.

[0003] The existing brushless DC motor is fully enclosed in a motor housing, which is not conducive to heat dissipation and has certain shortcomings in sealing. It cannot effectively adapt to work in a high dust environment. Therefore, it is urgent to invent a brushless DC motor. Summary of the Invention

[0004] The object of the present invention is to provide a brushless DC motor to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a brushless DC motor, comprising a motor housing, a sealing hole is provided in the middle of the right side of the motor housing, a second bearing hole is provided on the right side of the motor housing near the left side of the sealing hole, the sealing hole is interference fit with the test box cover, a through hole is provided in the middle of the test box cover, the through hole is sleeved on the right end of the motor shaft, the motor shaft is fixedly connected to the inner ring of the first deep groove bearing near the left side of the test box cover, the first deep groove bearing is interference fit with the sealing hole, the motor shaft in the motor housing is interference fit with the five-seven spacer near the left side of the first deep groove bearing, the inner wall of the motor housing is fixedly connected to the outer wall of the right side of the stator near the left side of the five-seven spacer, a motor back cover is provided on the left side of the stator, a stator hole is provided on the right side of the motor back cover, the stator hole is interference fit with the left side of the stator, the A movable hole is provided in the middle of the stator, and the movable hole is sleeved with the rotor, and the rotor is fixedly connected to the motor shaft. The inner wall of the left side of the motor rear cover is fixedly connected to the left side of the rear cover support seat. A first bearing hole is provided in the middle of the right side of the rear cover support seat, and a limiting hole is provided on the left side of the rear cover support seat near the first bearing hole. A rear cover mounting hole is provided on the left side of the rear cover support seat near the limiting hole. The first bearing hole is interference fit with the second deep groove bearing, and the inner ring of the second deep groove bearing is interference fit with the left end of the motor shaft. The motor shaft is interference fit with the Hall magnet near the left side of the second deep groove bearing. A Hall is provided on the motor shaft corresponding to the Hall magnet. A mounting hole is provided in the middle of the Hall, and the mounting hole is sleeved with the Hall magnet. The outer ring of the Hall is interference fit with the limiting hole, and the rear cover mounting hole is fixedly connected to the Hall rear cover.

[0006] Preferably, the sealing hole, through hole, second bearing hole, movable hole, stator hole, first bearing hole, limiting hole, mounting hole, and rear cover mounting hole are all the same, and the sealing hole, through hole, second bearing hole, movable hole, stator hole, first bearing hole, limiting hole, mounting hole, and rear cover mounting hole are all arranged on the same axis.

[0007] Preferably, the length of the rotor is equal to the length of the stator, and the rotor is arranged inside the stator.

[0008] Preferably, a hexagon socket head screw is provided between the motor rear cover and the motor housing, and the right side of the motor rear cover is fixedly connected to the left side of the motor housing through the hexagon socket head screw.

[0009] Preferably, the rear cover support seat and the motor rear cover are integrally formed, and the rear cover support seat is stepped.

[0010] Preferably, a fixing hole is opened in the middle of the Hall magnet, and the Hall magnet is interference-fitted with the motor shaft through the fixing hole.

[0011] Preferably, the rotor is arranged between the second deep groove bearing and the five-seven spacer sleeve of the motor shaft, and the length of the stator and rotor in the motor housing is greater than the length in the motor rear cover.

[0012] Preferably, three hexagon socket head screws are provided and distributed on the motor housing and the motor back cover in the shape of an equilateral triangle.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The brushless DC motor directly exposes more than half of the stator to the air through the motor back cover, stator and motor case. It is not wrapped by the motor case and motor back cover. When the motor generates heat during operation, the heat can be directly dissipated into the air to achieve the purpose of rapid heat dissipation of the motor. At the same time, it can effectively ensure that the motor is maintained at an excellent operating temperature, making it have extremely high working stability.

[0015] 2. The brushless DC motor is equipped with a test box cover and a Hall effect rear cover, which can ensure that the interior of the motor is in a well-sealed environment through the cooperation of the motor housing, motor rear cover, stator, test box cover and Hall effect rear cover, and can effectively prevent the entry of external media and cause damage to the motor interior, so that it can effectively adapt to various dusty environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0017] Figure 2 This is a schematic diagram of the front cross-sectional structure of the present invention;

[0018] Figure 3 This is a schematic diagram of the corrosion structure on two opposite sides of the present invention;

[0019] Figure 4 It is a schematic diagram of the left side structure of the present invention;

[0020] Figure 5 It is a schematic structural diagram of the right side of the present invention.

[0021] In the figure: 1 test box cover, 2 stator, 3 rotor, 4 Hall rear cover, 5 Hall, 6 Hall magnet, 7 motor rear cover, 8 hexagon socket head screw, 9 first deep groove ball bearing, 10 second deep groove ball bearing, 11 57 spacer, 12 motor shaft, 13 motor housing, 14 mounting hole, 15 limit hole, 16 rear cover support seat, 17 first bearing hole, 18 second bearing hole, 19 sealing hole, 20 through hole, 21 rear cover mounting hole, 22 stator hole, 23 movable hole. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] See also Figure 1-5The present invention provides a technical solution: a brushless DC motor, comprising a motor housing 13, a sealing hole 19 is opened in the middle of the right side of the motor housing 13, a second bearing hole 18 is opened on the right side of the motor housing 13 near the left side of the sealing hole 19, the sealing hole 19 is interference-fitted with the test box cover 1, a through hole 20 is opened in the middle of the test box cover 1, the through hole 20 is sleeved with the right end of the motor shaft 12, the motor shaft 12 is fixedly connected to the inner ring of the first deep groove bearing 9 near the left side of the test box cover 1, the first deep groove bearing 9 is interference-fitted with the sealing hole 19, the motor shaft in the motor housing 13 is interference-fitted with the five-seven spacer 11 near the left side of the first deep groove bearing 9, the inner wall of the motor housing 13 is fixedly connected to the outer wall of the right side of the stator 2 near the left side of the five-seven spacer 11, the motor rear cover 7 is provided on the left side of the stator 2, and the stator is opened on the right side of the motor rear cover 7 Hole 22, the stator hole 22 is interference fit on the left side of the stator 2, and a movable hole 23 is opened in the middle of the stator 2. The movable hole 23 is sleeved with the rotor 3, and the rotor 3 is arranged between the second deep groove bearing 10 and the five-seven spacer 11 of the motor shaft 12. The length of the stator 2 and the rotor 3 in the motor housing 13 is greater than the length in the motor back cover 7. The length of the rotor 3 is equal to the length of the stator 2, and the rotor 3 is arranged in the stator 2. The outer wall of the stator 2 is coated with an insulating layer. The motor back cover 7, the stator 2 and the motor housing 13 are provided, and more than half of the stator 2 is directly exposed to the air. It is not wrapped with the motor housing 13 and the motor back cover 7. When the motor generates heat during operation, the heat can be directly dissipated into the air to achieve the purpose of rapid heat dissipation of the motor, and at the same time, it can effectively ensure that the motor is maintained at an optimal temperature. Under good working temperature, it has extremely high working stability. The stator 2 is cylindrical as a whole, and the surface is smooth without any through holes and gaps. The rotor 3 is fixedly connected to the motor shaft 12. The inner wall of the left side of the motor back cover 7 is fixedly connected to the left side of the back cover support seat 16. The back cover support seat 16 and the motor back cover 7 are integrally formed, and the back cover support seat 16 is stepped. A first bearing hole 17 is opened in the middle of the right side of the back cover support seat 16, and a limiting hole 15 is opened on the left side of the back cover support seat 16 near the first bearing hole 17. A back cover mounting hole 21 is opened on the left side of the back cover support seat 16 near the limiting hole 15. The first bearing hole 17 is interference fit with the second deep groove bearing 10, and the inner ring of the second deep groove bearing 10 is interference fit with the left end of the motor shaft 12. The motor shaft 12 is interference fit on the left side of the second deep groove bearing 10 The Hall magnet 6 is combined, and the motor shaft 12 is provided with a Hall 5 corresponding to the Hall magnet 6. A mounting hole 14 is opened in the middle of the Hall 5, and the mounting hole 14 is sleeved with the Hall magnet 6. A fixing hole is opened in the middle of the Hall magnet 6. The Hall magnet 6 is interference fit with the motor shaft 12 through the fixing hole. The outer ring of the Hall 5 is interference fit with the limiting hole 15. The rear cover mounting hole 21 is fixedly connected to the Hall rear cover 4. The sealing hole 19, the through hole 20, the second bearing hole 18, the movable hole 23, the stator hole 22, the first bearing hole 17, the limiting hole 15, the mounting hole 14, and the rear cover mounting hole 21 are all the same, and the sealing hole 19, the through hole 20, the second bearing hole 18, the movable hole 23, the stator hole 22, the first bearing hole 17, the limiting hole 15, the mounting hole 14, and the rear cover mounting hole 21 are all arranged on the same axis.A hexagon socket head screw 8 is provided between the motor back cover 7 and the motor housing 13. The right side of the motor back cover 7 is fixedly connected to the left side of the motor housing 13 by the hexagon socket head screw 8. There are three hexagon socket head screws 8, which are distributed in a regular triangle on the motor housing 13 and the motor back cover 7. By setting the test box cover 1 and the Hall back cover 4, it can be ensured that the entire interior of the motor is in a good sealing environment through the cooperation of the motor housing 13, the motor back cover 7, the stator 2, the test box cover 1 and the Hall back cover 4, which can effectively prevent the entry of external media and cause damage to the inside of the motor. , thus being able to effectively adapt to various dusty environments. The first deep groove bearing 9 and the second deep groove bearing 10 are provided to effectively ensure the rotation of the motor shaft 12 and effectively convert the magnetic force generated between the stator 2 and the rotor 3 into power for the motor shaft 12. The sealing hole 19, through hole 20, second bearing hole 18, movable hole 23, stator hole 22, first bearing hole 17, limiting hole 15, mounting hole 14, and rear cover mounting hole 21 further facilitate the disassembly and maintenance of the motor, as well as the repair and replacement of wearing parts.

[0024] During use, the stator 2 and the rotor 3 rotate under the action of magnetism after power is turned on, thereby driving the motor shaft 12 to rotate. When heat is generated, the heat is directly dissipated through the part of the stator 2 exposed to the air. The sealed environment inside the motor is ensured by the cooperation of the motor housing 13, the motor back cover 7, the stator 2, the test box cover 1 and the Hall back cover 4.

[0025] To sum up, the brushless DC motor directly exposes a large part of the stator 2 to the air through the motor back cover 7, stator 2 and motor housing 13, and is not wrapped by the motor housing 13 and the motor back cover 7. When the motor generates heat during operation, the heat can be directly dissipated into the air to achieve the purpose of rapid heat dissipation of the motor. At the same time, it can effectively ensure that the motor is maintained at an excellent operating temperature, so that it has extremely high working stability. Through the test box cover 1 and Hall back cover 4, the entire interior of the motor can be ensured to be in a good sealed environment through the cooperation of the motor housing 13, motor back cover 7, stator 2, test box cover 1 and Hall back cover 4, which can effectively prevent the entry of external media and cause damage to the inside of the motor, thereby being able to effectively adapt to various dusty environments.

[0026] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A brushless DC motor, comprising a motor housing (13), characterized in that: A sealing hole (19) is provided in the middle of the right side of the motor housing (13), a second bearing hole (18) is provided on the right side of the motor housing (13) near the left side of the sealing hole (19), the sealing hole (19) is interference-fitted with the test box cover (1), a through hole (20) is provided in the middle of the test box cover (1), the through hole (20) is sleeved with the right end of the motor shaft (12), the motor shaft (12) is fixedly connected to the inner ring of the first deep groove bearing (9) near the left side of the test box cover (1), the first deep groove bearing (9) is interference-fitted with the sealing hole (19), the motor shaft in the motor housing (13) is close to the left side of the first deep groove bearing (9) and is interference-fitted with the five-seven spacer (11), the inner wall of the motor housing (13) is close to the left side of the five-seven spacer (11) and is fixedly connected to the right outer wall of the stator (2), the left side of the stator (2) is provided with a motor rear cover (7), the right side of the motor rear cover (7) is provided with a stator hole (22), the stator hole (22) is interference-fitted with the left side of the stator (2), the middle part of the stator (2) is provided with a movable hole (23), the movable hole (23) is sleeved The rotor (3) is fixedly connected to the motor shaft (12), the left inner wall of the motor rear cover (7) is fixedly connected to the left side of the rear cover support seat (16), a first bearing hole (17) is provided in the middle of the right side of the rear cover support seat (16), a limiting hole (15) is provided on the left side of the rear cover support seat (16) near the first bearing hole (17), a rear cover mounting hole (21) is provided on the left side of the rear cover support seat (16) near the limiting hole (15), the first bearing hole (17) is interference-fitted with the second deep groove bearing (1 0), the inner ring of the second deep groove bearing (10) is interference-fitted with the left end of the motor shaft (12), the motor shaft (12) is interference-fitted with the Hall magnet (6) near the left side of the second deep groove bearing (10), the motor shaft (12) is provided with a Hall (5) corresponding to the Hall magnet (6), the middle of the Hall (5) is provided with a mounting hole (14), the mounting hole (14) is sleeved with the Hall magnet (6), the outer ring of the Hall (5) is interference-fitted with the limiting hole (15), and the rear cover mounting hole (21) is fixedly connected to the Hall rear cover (4); The diameter of the rotating shaft in the first deep groove bearing (9) is larger than the diameter of the bearing in the test box cover (1).

2. A brushless DC motor according to claim 1, characterized in that: The sealing hole (19), the through hole (20), the second bearing hole (18), the movable hole (23), the stator hole (22), the first bearing hole (17), the limiting hole (15), the mounting hole (14), and the rear cover mounting hole (21) are all identical, and the sealing hole (19), the through hole (20), the second bearing hole (18), the movable hole (23), the stator hole (22), the first bearing hole (17), the limiting hole (15), the mounting hole (14), and the rear cover mounting hole (21) are all arranged on the same axis.

3. A brushless DC motor according to claim 1, characterized in that: The length of the rotor (3) is equal to the length of the stator (2), and the rotor (3) is arranged inside the stator (2).

4. A brushless DC motor according to claim 1, characterized in that: A hexagon socket head screw (8) is provided between the motor rear cover (7) and the motor housing (13), and the right side of the motor rear cover (7) is fixedly connected to the left side of the motor housing (13) via the hexagon socket head screw (8).

5. The brushless DC motor according to claim 1, wherein: The rear cover support seat (16) and the motor rear cover (7) are integrally formed, and the rear cover support seat (16) is in a stepped shape.

6. A brushless DC motor according to claim 1, characterized in that: A fixing hole is provided in the middle of the Hall magnet (6), and the Hall magnet (6) is interference-fitted with the motor shaft (12) through the fixing hole.

7. The brushless DC motor according to claim 1, characterized in that: The rotor (3) is arranged between the second deep groove bearing (10) and the five-seven spacer (11) of the motor shaft (12); the length of the stator (2) and the rotor (3) in the motor housing (13) is greater than the length in the motor rear cover (7).

8. The brushless DC motor according to claim 4, characterized in that: Three hexagon socket head screws (8) are provided and distributed in a regular triangle on the motor housing (13) and the motor rear cover (7).

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