Outer rotor brushless direct current motor structure adopting two-point support

Abstract

The utility model relates to an outer rotor brushless direct current motor structure adopting two-point support, which belongs to the technical field of brushless direct current motors and comprises a front cover and a rear cover, a rotating shaft extending out of the front cover is arranged in the rear cover, an outer rotor casing fixedly connected with the rotating shaft in a nesting manner is arranged between the front cover and the rear cover, and the outer rotor casing is fixedly connected with the rotating shaft in a nesting manner. An iron core is arranged in the outer rotor casing, an outer rotor magnetic ring is arranged between the iron core and the outer rotor casing, and an outer rotor bearing seat sleeved with the rotating shaft is arranged between the iron core and the rear cover. The device has the characteristics of simple structure, good operation stability, firm support and long service life. The rotating shaft is well supported through the two-point supporting structure, the stability of the motor in the operation process is improved, and the service life of the motor is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of brushless DC motors, and particularly relates to a structure of an outer-rotor brushless DC motor with two-point support. Background Technique

[0002] A brushless DC motor consists of a motor main body and a driver, and is a typical mechatronic product. A brushless motor refers to a motor without a brush and a commutator (or slip ring), also known as a non-commutator motor. The stator windings of the motor are mostly made into a three-phase symmetrical star connection, which is very similar to a three-phase asynchronous motor. A permanent magnet that has been magnetized is adhered to the rotor of the motor. In order to detect the polarity of the rotor of the motor, a position sensor is installed in the motor.

[0003] The driver is composed of power electronic devices and integrated circuits, etc. Its functions are: receiving the start, stop, and brake signals of the motor to control the start, stop, and brake of the motor; receiving the position sensor signal and the forward and reverse signals to control the on and off of each power tube of the inverter bridge to generate continuous torque; receiving the speed command and the speed feedback signal to control and adjust the speed; providing protection and display, etc. Summary of the Invention

[0004] The utility model mainly solves the deficiencies existing in the prior art, and provides a structure of an outer-rotor brushless DC motor with two-point support, which has the characteristics of simple structure, good operation stability, firm support, and long service life. The two-point support structure forms a good support for the rotating shaft, improves the stability of the motor during operation, and extends the service life of the motor.

[0005] The above technical problems of the utility model are mainly solved by the following technical solutions:

[0006] A structure of an outer-rotor brushless DC motor with two-point support includes a front cover and a rear cover. A rotating shaft extending out of the front cover is arranged inside the rear cover. An outer-rotor housing nested and fixedly connected with the rotating shaft is arranged between the front cover and the rear cover. An iron core is arranged inside the outer-rotor housing. An outer-rotor magnetic ring is arranged between the iron core and the outer-rotor housing. An outer-rotor bearing seat sleeved on the rotating shaft is arranged between the iron core and the rear cover.

[0007] Preferably, ball bearings are arranged between the rotating shaft and the front cover, and between the rotating shaft and the outer-rotor bearing seat.

[0008] Preferably, a pair of semi-circular snap rings that are snap-fitted and fixedly connected with the rotating shaft are arranged at the inner ends of the ball bearings.

[0009] Preferably, the front cover and the rear cover are fixedly connected by screws.

[0010] Preferably, an assembly snap ring groove integrated with the rotating shaft is provided at the front end of the rotating shaft.

[0011] The utility model can achieve the following effects:

[0012] The utility model provides an outer rotor brushless DC motor structure with two-point support. Compared with the prior art, it has the characteristics of simple structure, good running stability, firm support and long service life. The two-point support structure forms a good support for the rotating shaft, improves the stability of the motor during operation, and extends the service life of the motor. Description of the Drawings

[0013] Figure 1 is a structural cross-sectional view of the utility model.

[0014] In the figure: front cover 1, rotating shaft 2, assembly snap ring groove 3, ball bearing 4, snap ring 5, outer rotor housing 6, outer rotor magnetic ring 7, iron core 8, outer rotor bearing seat 9, rear cover 10. Detailed Embodiment

[0015] The technical solution of the utility model will be further specifically described below through embodiments and in conjunction with the drawings.

[0016] Embodiment: As Figure 1 shown, an outer rotor brushless DC motor structure with two-point support includes a front cover 1 and a rear cover 10. The front cover 1 and the rear cover 10 are fixedly connected by screws. A rotating shaft 2 extending out of the front cover 1 is provided inside the rear cover 10. An assembly snap ring groove 3 integrated with the rotating shaft 2 is provided at the front end of the rotating shaft 2. An outer rotor housing 6 nested and fixedly connected with the rotating shaft 2 is provided between the front cover 1 and the rear cover 10. An iron core 8 is provided inside the outer rotor housing 6. An outer rotor magnetic ring 7 is provided between the iron core 8 and the outer rotor housing 6. An outer rotor bearing seat 9 sleeved with the rotating shaft 2 is provided between the iron core 8 and the rear cover 10. Ball bearings 4 are provided between the rotating shaft 2 and the front cover 1, and between the rotating shaft 2 and the outer rotor bearing seat 9. A pair of semi-circular snap rings 5 that are snap-fitted and fixedly connected with the rotating shaft 2 are provided at the inner ends of the ball bearings 4.

[0017] In summary, the outer rotor brushless DC motor structure with two-point support has the characteristics of simple structure, good running stability, firm support and long service life. The two-point support structure forms a good support for the rotating shaft, improves the stability of the motor during operation, and extends the service life of the motor.

[0018] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and without departing from the basic features of the utility model, the present utility model can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

[0019] In summary, the above are only specific embodiments of the present utility model, but the structural features of the present utility model are not limited thereto. Any changes or modifications made by those skilled in the art within the field of the present utility model are covered by the patent scope of the present utility model.

Claims

1. A structure of an outer-rotor brushless DC motor with two-point support, characterized in that: It includes a front cover (1) and a rear cover (10). A rotating shaft (2) extending out of the front cover (1) is provided inside the rear cover (10). An outer rotor housing (6) nested and fixedly connected to the rotating shaft (2) is provided between the front cover (1) and the rear cover (10). An iron core (8) is provided inside the outer rotor housing (6). An outer rotor magnetic ring (7) is provided between the iron core (8) and the outer rotor housing (6). An outer rotor bearing seat (9) sleeved on the rotating shaft (2) is provided between the iron core (8) and the rear cover (10).

2. The structure of an outer rotor brushless DC motor with two-point support according to claim 1, characterized in that: Ball bearings (4) are provided between the rotating shaft (2) and the front cover (1), and between the rotating shaft (2) and the outer rotor bearing seat (9).

3. The structure of an outer-rotor brushless DC motor with two-point support according to claim 2, wherein: A pair of semi-circular snap rings (5) that are fixedly connected by snap-fitting with the rotating shaft (2) are provided at the inner ends of the ball bearings (4).

4. A structure of an outer rotor brushless DC motor with two-point support according to claim 1, characterized in that: The front cover (1) and the rear cover (10) are fixedly connected by screws.

5. The structure of an outer rotor brushless DC motor with two-point support according to claim 1, characterized in that: An assembly snap ring groove (3) integrated with the rotating shaft (2) is provided at the front end of the rotating shaft (2).

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