Permanent magnet brushless direct current motor

Abstract

The invention discloses a permanent magnet brushless direct current motor which comprises an end cover, a shell, an output shaft and a positioning rod. One side of the shell is partially and internally connected to the end cover, the other side of the shell is internally connected with an output shaft, and the output shaft and the positioning rod are coaxially arranged; an end cover opening is formed in the center of the end cover, a positioning rod is arranged in the end cover, one end of the positioning rod is fixedly connected with the end cover, and the other end of the positioning rod is close to the end cover opening. The permanent magnet brushless direct current motor disclosed by the invention has the beneficial effects that the permanent magnet brushless direct current motor can be matched with external sensing equipment to sense whether the axial direction of the output shaft deviates or not.

Description

Technical Field

[0001] The invention belongs to the field of permanent magnet motors, and in particular relates to a permanent magnet brushless DC motor. Background Art

[0002] The publication number is CN213879510U, the subject name is the utility model patent of permanent magnet brushless DC motor, and its IPC classification number is H02K5 / 24. Its technical solution discloses "a permanent magnet brushless DC motor, which includes a mounting plate 1, a motor body 2, a bracket 3 and a cover plate 4. The bracket 3 is made of aluminum, which is light and has good shock absorption. The bracket 3 and the motor body 2 are fixed between the mounting plate 1 and the cover plate 4. The motor body 2 is fixed to the bracket 3, for example, it can be fixed to the bracket 3 by means of threaded connectors such as screws, or it can be fixed by means of snaps or the like."

[0003] It can be seen that the above utility model patent has disclosed one of the technical solutions of permanent magnet brushless DC motor. However, the technical solution disclosed in the above utility model patent focuses on vibration reduction and noise reduction, and does not further solve the problem of sensing the axial deviation of the output shaft, which needs to be further improved. Summary of the invention

[0004] The present invention aims at the prior art, overcomes the above defects and provides a permanent magnet brushless DC motor.

[0005] The present invention adopts the following technical solution: a permanent magnet brushless DC motor comprises an end cover, a housing, an output shaft and a positioning rod, wherein:

[0006] One side of the housing is partially inscribed in the end cover, and the other side of the housing is inscribed with an output shaft, which is coaxially arranged with the positioning rod;

[0007] The center of the end cover is provided with an end cover opening, and a positioning rod is built in the end cover, one end of the positioning rod is fixedly connected to the end cover, and the other end of the positioning rod is close to the end cover opening.

[0008] As a preferred technical solution of the above technical solution, the positioning rod is provided with a first rod body and a second rod body, the first rod body and the second rod body are axially symmetrical, the end of the first rod body close to the end cover opening has a first concave surface, and the end of the second rod body close to the end cover opening has a second concave surface.

[0009] As a preferred technical solution of the above technical solution, a first groove and a second groove are provided between the first rod body and the second rod body, and the first groove and the second groove are axially symmetrical.

[0010] As a preferred technical solution of the above technical solution, the first concave surface, the second concave surface, the first groove and the second groove together form a central plane, and the central plane is located at the center of the end of the positioning rod.

[0011] As a preferred technical solution of the above technical solutions, a plurality of reinforcing ribs are provided around the shell, the reinforcing ribs are integrally formed with the shell, and the reinforcing ribs are axially symmetrical with respect to the axial direction of the shell.

[0012] As a preferred technical solution of the above technical solutions, the end of the reinforcing edge has a reinforcing edge end face, the reinforcing edge end face is provided with an auxiliary positioning block, and the auxiliary positioning block is integrally formed with the reinforcing edge.

[0013] The permanent magnet brushless DC motor disclosed in the present invention has the beneficial effect of being able to cooperate with an external sensing device to sense whether the axial direction of the output shaft is offset. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the main view of this application.

[0015] Figure 2 It is a side view of the present application.

[0016] Figure 3 It is a top view of this application.

[0017] Figure 4 It is a stereogram from one viewing angle of this application.

[0018] Figure 5 It is a stereogram from another viewing angle of the present application.

[0019] Figure 6 yes Figure 4 A partial enlarged view of area A.

[0020] Figure 7 yes Figure 5 A partial enlarged view of area B.

[0021] The reference numerals include: 110-end cover; 111-end cover opening; 120-housing; 121-reinforcement rib; 122-reinforcement rib end face; 123-auxiliary positioning block; 130-output shaft; 140-positioning rod; 141-first rod body; 142-second rod body; 143-first concave surface; 144-second concave surface; 145-first groove; 146-second groove; 147-center surface. DETAILED DESCRIPTION

[0022] The present invention discloses a permanent magnet brushless DC motor. Figures 1 to 7 , the specific implementation modes of the present invention are further described.

[0023] See attached figure Figures 1 to 7 , Figures 1 to 5 The permanent magnet brushless DC motor is shown in different perspectives. Figure 6 and Figure 7 The partial structures of the permanent magnet brushless DC motor are shown respectively.

[0024] Example 1.

[0025] Preferably, the permanent magnet brushless DC motor comprises an end cover 110, a housing 120, an output shaft 130 and a positioning rod 140, wherein:

[0026] One side of the housing 120 is partially inscribed in the end cover 110, and the other side of the housing 120 is inscribed with an output shaft 130, and the output shaft 130 is coaxially arranged with the positioning rod 140;

[0027] An end cover opening 111 is provided at the center of (the end face of) the end cover 110, a positioning rod 140 is built into the end cover 110, one end of the positioning rod 140 is fixedly connected to (the inner surface of) the end cover 110, and the other end of the positioning rod 140 is close to the end cover opening 111 (but does not extend out of the end cover 110); this allows the permanent magnet brushless DC motor to maintain external power output through the output shaft 130 while being able to use the positioning rod 140 as a reference for sensing slight deviations.

[0028] Among them, the positioning rod 140 is provided with a first rod body 141 and a second rod body 142, the first rod body 141 and the second rod body 142 are axially symmetrical, the end of the first rod body 141 close to the end cover opening 111 has a first concave surface 143, and the end of the second rod body 142 close to the end cover opening 111 has a second concave surface 144; so that the perception light beam of the external perception device aimed at the positioning rod 140 can be better focused on the center position (center surface 147) of the end of the positioning rod 140.

[0029] A first groove 145 and a second groove 146 are defined between the first rod body 141 and the second rod body 142 , and the first groove 145 and the second groove 146 are axially symmetrical.

[0030] Among them, the first concave surface 143, the second concave surface 144, the first groove 145 and the second groove 146 together form a center plane 147, and the center plane 147 is located at the center of the end of the positioning rod 140 (close to the end cover opening 111); so that under ideal conditions (the positioning rod 140 has no offset, which is equivalent to the output shaft 130 having no offset), the perception light beam of the external sensing device aimed at the positioning rod 140 can be better focused on the center position of the end of the positioning rod 140, that is, the center plane 147; when the positioning rod 140 has a slight offset, due to the combined effect of the two concave surfaces and the two grooves, the perception light beam of the external sensing device aimed at the positioning rod 140 can no longer be focused on the center position of the end of the positioning rod 140, that is, the center plane 147; the external sensing device can sense whether the axial direction of the output shaft 130 is offset based on the light intensity of the center plane 147.

[0031] A plurality of reinforcing ribs 121 are disposed around the shell 120 . The reinforcing ribs 121 are integrally formed with the shell 120 . The reinforcing ribs 121 are axially symmetrical with respect to the axial direction of the shell 120 .

[0032] Among them, the end of the reinforcing edge 121 has a reinforcing edge end face 122, and the reinforcing edge end face 122 is provided with an auxiliary positioning block 123, and the auxiliary positioning block 123 is integrally formed with the reinforcing edge 121; so that the external sensing device can aim at multiple auxiliary positioning blocks 123 at the same time, thereby assisting in positioning the center position of the output shaft 130.

[0033] It should be noted that the reason why the positioning rod 140 is sensed to indirectly obtain the offset of the output shaft 130 is that the output shaft 130 is usually further externally connected to other devices, and it is impossible to directly aim at the center of the output shaft 130 during operation.

[0034] It is worth mentioning that the technical features such as external sensing devices involved in the patent application of this invention should be regarded as prior art. The specific structure, working principle and possible control method and spatial layout method of these technical features can be selected according to the conventional methods in the field, and should not be regarded as the inventive point of this patent. This patent will not be further elaborated.

[0035] For those skilled in the art, it is still possible to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A permanent magnet brushless DC motor, characterized in that: It includes an end cover, a housing, an output shaft and a positioning rod, wherein: One side of the housing is partially inscribed in the end cover, and the other side of the housing is inscribed with an output shaft, which is coaxially arranged with the positioning rod; The center of the end cover is provided with an end cover opening, and a positioning rod is built in the end cover, one end of the positioning rod is fixedly connected to the end cover, and the other end of the positioning rod is close to the end cover opening.

2. The permanent magnet brushless DC motor according to claim 1, characterized in that: The positioning rod is provided with a first rod body and a second rod body, the first rod body and the second rod body are axially symmetrical, the end of the first rod body close to the end cover opening has a first concave surface, and the end of the second rod body close to the end cover opening has a second concave surface.

3. The permanent magnet brushless DC motor according to claim 2, characterized in that: A first groove and a second groove are provided between the first rod body and the second rod body, and the first groove and the second groove are axially symmetrical.

4. The permanent magnet brushless DC motor according to claim 1, characterized in that: The first concave surface, the second concave surface, the first groove and the second groove together form a central plane, and the central plane is located at the center of the end of the positioning rod.

5. The permanent magnet brushless DC motor according to claim 1, characterized in that: A plurality of reinforcing edges are arranged around the shell body, the reinforcing edges are integrally formed with the shell body, and the reinforcing edges are axially symmetrical with respect to the axial direction of the shell body.

6. The permanent magnet brushless DC motor according to claim 5, characterized in that: The end of the reinforcing rib is provided with a reinforcing rib end face, the reinforcing rib end face is provided with an auxiliary positioning block, and the auxiliary positioning block is integrally formed with the reinforcing rib.

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