Brushless DC motor

Abstract

The invention provides a brushless DC motor, and belongs to the technical field of motors, and the brushless DC motor is characterized in that a first sealing ring is arranged between a front end cover and a housing, and the radial sealing of the front end cover and the housing is realized; a second sealing ring is arranged between the rear end cover and the shell to realize radial sealing of the rear end cover and the shell; the rear end cover is a glass sintering rear end cover, a conductive contact piece is arranged on the glass sintering rear end cover, a glass tube sleeved on the periphery of the contact piece is arranged on the glass sintering rear end cover, the glass tube and the contact piece are fixed together in a sintering sealing mode, the glass tube and the glass sintering rear end cover are fixed together in a sintering mode, and two ends of the contact piece extend out of the glass tube. One end of the power line in the shell is welded with one end of the contact piece, one end of the power line outside the shell is welded with the other end of the contact piece, and the welded part of the power line and the contact piece is encapsulated by pouring sealant. According to the processing scheme, the sealing performance and the operation stability of the motor are improved.

Description

Technical Field

[0001] The present application relates to the field of electric motors, and in particular to a brushless DC motor. Background Art

[0002] In traditional electric lubricating oil pump systems, high-speed non-oil-immersed motors are generally used, with speeds generally above 6000r / min, and mechanical seals are generally used between the non-oil-immersed motor and the pump body. At high motor speeds, seal failure is prone to occur, causing motor failure, resulting in a shorter life of the traditional electric lubricating oil pump system. Summary of the invention

[0003] In view of this, the present application provides a brushless DC motor, which solves the problems in the prior art that the motor is prone to failure and the electric lubricating oil pump system has a short life, and improves the sealing performance and operating stability of the motor.

[0004] The present application provides a brushless DC motor that adopts the following technical solution:

[0005] A brushless DC motor comprises a housing, a rotor, a stator, a front end cover, a rear end cover and a power line, wherein a first sealing ring is arranged between the front end cover and the housing to achieve radial sealing between the front end cover and the housing; a second sealing ring is arranged between the rear end cover and the housing to achieve radial sealing between the rear end cover and the housing;

[0006] The rear end cover is a glass sintered rear end cover, on which a conductive contact piece is arranged, and on which a glass tube sleeved on the outer periphery of the contact piece is arranged, and the glass tube and the contact piece are fixed together by sintering sealing, and the glass tube and the glass sintered rear end cover are sintered and fixed together, and both ends of the contact piece extend out of the glass tube, one end of the power line in the shell is welded to one end of the contact piece, and one end of the power line outside the shell is welded to the other end of the contact piece, and the welding part of the power line and the contact piece is potted with potting glue.

[0007] Optionally, a glass sintered electrical connector is provided on the glass sintered rear end cover, and a through hole is provided on the glass sintered rear end cover for the internal cable of the glass sintered electrical connector to pass through.

[0008] Optionally, a third sealing ring is provided between the glass sintered electrical connector and the glass sintered rear end cover to achieve axial sealing between the glass sintered electrical connector and the glass sintered rear end cover.

[0009] Optionally, the rotor comprises a rotating shaft and a yoke, the rotating shaft is rotatably mounted in the housing, a hollow channel is provided inside the rotating shaft, and an oil outlet hole communicating with the hollow channel is provided on a side wall of the rotating shaft;

[0010] The front end cover is provided with an oil inlet hole, and the oil inlet hole is communicated with the hollow channel;

[0011] The front end cover is provided with an oil drain hole, and the oil drain hole is communicated with the inner cavity of the motor.

[0012] Optionally, end plates are bonded to both ends of the yoke, and a protective sleeve is provided on the outside of the yoke.

[0013] The optional brushless DC motor also includes a rotary transformer, which is fixed in the housing. One end of the rotating shaft is rotatably connected to the front end cover, and the other end of the rotating shaft is connected to the rotating end of the rotary transformer.

[0014] Optionally, the fixed end and the rotating end of the rotary transformer are potted with potting glue.

[0015] In summary, this application includes the following beneficial technical effects:

[0016] The present application provides a brushless DC motor with high sealing performance and long-term operation by sealing and protecting the stator, rotor and power lead wires, so that the inside of the brushless DC motor is immersed in oil and oil circulation cooling is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 This is a schematic diagram of the overall structure of the brushless DC motor of this application;

[0019] Figure 2 This is a schematic diagram of the structure of the rotor of this application;

[0020] Figure 3 This is a schematic diagram of the structure of the power cord and rear end cover of this application.

[0021] Explanation of the reference numerals: 11, front end cover; 12, first sealing ring; 13, bearing; 14, housing; 15, stator; 16, rotor; 17, rotary transformer; 18, second sealing ring; 19, glass sintered rear end cover; 110, third sealing ring; 111, glass sintered electrical connector; 21, rotating shaft; 22, yoke; 23, protective cover; 24, end plate; 25, oil outlet; 31, glass tube; 32, contact piece; 34, power cord; 35, potting glue. DETAILED DESCRIPTION

[0022] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0023] The following describes the implementation methods of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the following embodiments and the features in the embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0024] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0025] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show the components related to the present application rather than being drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0026] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0027] An embodiment of the present application provides a brushless DC motor.

[0028] like Figures 1 to 3As shown, a brushless DC motor includes a housing 14, a rotor 16, a stator 15, a front cover 11, a rear cover and a power line 34. A first sealing ring 12 is provided between the front cover 11 and the housing 14 to achieve radial sealing between the front cover 11 and the housing 14; a second sealing ring 18 is provided between the rear cover and the housing 14 to achieve radial sealing between the rear cover and the housing 14. The front cover 11 is fixed to one end of the housing 14 by bolts, and the rear cover is fixed to the other end of the housing 14 by bolts. The stator 15 is fixed to the inner wall of the housing 14 by hot pressing, and the winding of the stator 15 is potted.

[0029] The rear end cover is a glass sintered rear end cover 19, on which a conductive contact piece 32 is provided, and on which a glass tube 31 is provided which is sleeved on the outer periphery of the contact piece 32. The glass tube 31 and the glass sintered rear end cover 19 are sintered and fixed together, and the glass tube 31 and the contact piece 32 are sealed and fixed together by high-temperature sintering. Both ends of the contact piece 32 extend out of the glass tube 31, one end of the power line 34 in the outer shell 14 is welded to one end of the contact piece 32, and one end of the power line 34 outside the outer shell 14 is welded to the other end of the contact piece 32. The welding part of the power line 34 and the contact piece 32 is potted by potting glue 35, so as to ensure the sealing between the power line 34 of the motor and the glass sintered rear end cover 19.

[0030] The glass sintered rear end cover 19 is provided with a glass sintered electrical connector 111, and the glass sintered rear end cover 19 is provided with a through hole for the internal cable of the glass sintered electrical connector 111 to pass through, and the glass sintered electrical connector 111 is fixed to the glass sintered rear end cover 19 by screws. A third sealing ring 110 is provided between the glass sintered electrical connector 111 and the glass sintered rear end cover 19 to achieve axial sealing of the glass sintered electrical connector 111 and the glass sintered rear end cover 19.

[0031] The rotor 16 includes a rotating shaft 21 and a yoke 22. The rotating shaft 21 is rotatably installed in the housing 14. The two ends of the yoke 22 are bonded with end plates 24. The outer side of the yoke 22 is provided with a protective sleeve 23 to protect the rotor 16. A hollow channel is provided inside the rotating shaft 21, and an oil outlet 25 connected to the hollow channel is provided on the side wall of the rotating shaft 21; an oil inlet is provided on the front cover 11, and the oil inlet is connected to the hollow channel; an oil drain is provided on the front cover 11, and the oil drain is connected to the inner cavity of the motor. When in use, the oil passes through the hollow channel of the rotating shaft 21, and under high-speed rotation, enters the inner cavity of the motor through the oil outlet 25 on the rotating shaft 21, and returns to the outside through the oil drain of the front cover 11 under the action of the internal and external pressure difference.

[0032] The brushless DC motor further includes a rotary transformer 17, which is fixed in the housing 14 by screws, one end of the rotating shaft 21 is rotatably connected to the front end cover 11 through the bearing 13, and the other end of the rotating shaft 21 is connected to the rotating end of the rotary transformer 17. The bearing 13 is a grease-free bearing 13.

[0033] The fixed end and the rotating end of the rotary transformer 17 are potted with potting glue.

[0034] The present application provides a brushless DC motor with high sealing performance and long-term operation by sealing and protecting the stator 15, the rotor 16 and the power lead wire, so that the inside of the brushless DC motor is immersed in oil and oil circulation cooling is achieved.

[0035] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A brushless DC motor, comprising a housing (14), a rotor (16), a stator (15), a front cover (11), a rear cover and a power cord (34), characterized in that: A first sealing ring (12) is provided between the front end cover (11) and the outer shell (14) to achieve radial sealing between the front end cover (11) and the outer shell (14); a second sealing ring (18) is provided between the rear end cover and the outer shell (14) to achieve radial sealing between the rear end cover and the outer shell (14); The rear end cover is a glass sintered rear end cover (19), a conductive contact piece (32) is provided on the glass sintered rear end cover (19), a glass tube (31) sleeved on the outer periphery of the contact piece (32) is provided on the glass sintered rear end cover (19), the glass tube (31) and the contact piece (32) are fixed together by sintering sealing, the glass tube (31) and the glass sintered rear end cover (19) are sintered and fixed together, two ends of the contact piece (32) extend out of the glass tube (31), one end of a power line (34) in the housing (14) is welded to one end of the contact piece (32), one end of a power line (34) outside the housing (14) is welded to the other end of the contact piece (32), and the welded portion of the power line (34) and the contact piece (32) is potted with potting glue (35).

2. The brushless DC motor according to claim 1, characterized in that: The glass sintered rear end cover (19) is provided with a glass sintered electrical connector (111), and the glass sintered rear end cover (19) is provided with a through hole for the internal cable of the glass sintered electrical connector (111) to pass through.

3. The brushless DC motor according to claim 2, characterized in that: A third sealing ring (110) is provided between the glass sintered electrical connector (111) and the glass sintered rear end cover (19) to achieve axial sealing between the glass sintered electrical connector (111) and the glass sintered rear end cover (19).

4. The brushless DC motor according to claim 1, characterized in that: The rotor (16) comprises a rotating shaft (21) and a yoke (22); the rotating shaft (21) is rotatably mounted in the housing (14); a hollow passage is provided inside the rotating shaft (21); and an oil outlet hole (25) communicating with the hollow passage is provided on a side wall of the rotating shaft (21); The front end cover (11) is provided with an oil inlet hole, and the oil inlet hole is in communication with the hollow channel; The front end cover (11) is provided with an oil drain hole, and the oil drain hole is communicated with the inner cavity of the motor.

5. The brushless DC motor according to claim 4, characterized in that: End plates (24) are bonded to both ends of the yoke (22), and a protective sleeve (23) is provided on the outside of the yoke (22).

6. The brushless DC motor according to claim 4, characterized in that: The brushless DC motor also includes a rotary transformer (17), which is fixed in the housing (14); one end of the rotary shaft (21) is rotatably connected to the front end cover (11); and the other end of the rotary shaft (21) is connected to the rotating end of the rotary transformer (17).

7. The brushless DC motor according to claim 6, characterized in that: The fixed end and the rotating end of the rotary transformer (17) are potted with potting glue.

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