Permanent magnet brushless motor for ceiling fan

Abstract

The utility model provides a permanent magnet brushless motor for a ceiling fan, and belongs to the technical field of brushless motors. The motor comprises a main shaft, a stator set and a rotor set are arranged on the main shaft, the stator set comprises a stator frame fixed on the main shaft, an enameled wire set is arranged on the outer side of the stator frame, a first bearing and a second bearing are respectively fixed on the main shaft, and the stator frame is located between the first bearing and the second bearing. The rotor set comprises a motor shell with an upper opening, a motor upper cover for sealing the upper opening covers the motor shell, a first bearing frame used for being connected with the first bearing in an embedded mode is formed in the middle of the motor upper cover, a main shaft and a through hole are formed in the middle of the first bearing frame, the main shaft extends out of the main shaft through the main shaft, and the motor shell comprises a motor bottom shell. A second bearing frame used for being connected with the second bearing in an embedded mode is formed on the upper end face of the motor bottom shell, and a plurality of fan blade connecting frames are axially fixed to the upper portion of the motor upper cover. The silencing device has an obvious silencing effect and is stable to use.

Description

Technical Field

[0001] The utility model belongs to the technical field of brushless motors, in particular to a permanent magnet brushless motor for a ceiling fan. Background Art

[0002] At present, brushless motors do not have brushes, so there is no electric spark generated by the operation of brushed motors, which reduces damage and interference to motor components.

[0003] Brushless motors used in ceiling fans usually have high power and high overall speed, and are prone to generate large friction between the upper and lower ends of the stator and the outer rotor, which easily generates large noise. In addition, in order to be able to install more fan blades, the overall volume of the outer rotor is usually larger, so that there is space on the end face of the outer rotor to install more fan blades. This method causes the outer edge of the stator, that is, the circular part formed by the enameled wire group, to be far from the center of the stator. In the working state, the enameled wire of the stator is energized to generate a certain magnetic field. Under high-speed operation, due to the area, the enameled wire group will have a certain up and down vibration, which will further cause noise. Summary of the invention

[0004] The utility model aims to solve the above problems and provide a permanent magnet brushless motor for a ceiling fan, which has obvious mute effect and is more stable in use.

[0005] The purpose of the utility model is achieved in this way:

[0006] A permanent magnet brushless motor for a ceiling fan comprises a main shaft, on which a stator group and a rotor group are arranged, the stator group comprises a stator frame fixed on the main shaft, an enameled wire group is arranged on the outer side of the stator frame, a first bearing and a second bearing are respectively fixed on the main shaft, and the stator frame is located between the first bearing and the second bearing, the rotor group comprises a motor housing with an upper opening, the upper cover of the motor housing is provided with a motor upper cover sealing the upper opening, a first bearing frame for embedding the first bearing is formed in the middle of the motor upper cover, a main shaft through hole for the main shaft to extend is opened in the middle of the first bearing frame, the motor housing comprises a motor bottom shell, an upper end surface of the motor bottom shell is formed with a second bearing frame for embedding with the second bearing, and a plurality of fan blade connecting frames are axially fixed above the motor upper cover.

[0007] The utility model is further configured that the stator frame includes a stator frame sleeve sleeved on the main shaft, the outer wall of the stator frame sleeve extends outward and is formed with a circular support ring, the outer edge of the support ring is formed with the enameled wire group, and the middle part of the support ring extends outward and the thickness gradually decreases.

[0008] The utility model is further configured such that the support ring is evenly distributed with a plurality of stator through holes, the support ring is formed with corresponding grooves at the top and bottom, and the stator through holes are opened in the grooves.

[0009] The utility model is further configured that the motor upper cover is evenly distributed with a plurality of sliding rods that spread outwards, and the lower end of the fan blade connecting frame is slidably arranged on the upper end of the sliding rods.

[0010] The utility model is further configured that a plurality of fixing screw holes are opened on the upper end of the slide rod, and a plurality of mounting screw holes are opened on the fan blade connecting frame, and the mounting screw holes are fixed in the fixing screw holes by bolts.

[0011] The utility model is further configured that a fixing through hole is provided on the main shaft extending out of the motor upper cover, and an oblique through hole communicating with the motor housing is provided on the main shaft.

[0012] Compared with the prior art, the utility model has the following outstanding and beneficial technical effects:

[0013] 1. The permanent magnet brushless motor provided by the utility model has a main shaft passing through two sets of bearings to avoid direct contact with the rotor set, thereby greatly reducing the noise generated during operation.

[0014] 2. The stator frame further provided by the present invention has a thickness at the edge that gradually decreases compared to the center, so that the centrifugal force of the outer wall is reduced during the rotation of the outer rotor, which greatly reduces vibration and thus reduces noise.

[0015] 3. The grooves and stator through holes further provided in the utility model reduce the weight of the stator frame, thereby further reducing vibration and improving the quieting effect.

[0016] 4. The slide rod provided by the utility model can allow the fan blade connecting frame to slide and be locked by bolts, which provides convenience for installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a cross-sectional schematic diagram of the utility model;

[0018] Figure 2 It is a structural schematic diagram of the utility model;

[0019] Figure 3 It is a partial explosion schematic diagram of the utility model;

[0020] Figure 4 It is a structural schematic diagram of the stator frame of the utility model;

[0021] Reference numerals:

[0022] 1-main shaft; 10-first bearing; 11-second bearing; 12-oblique through hole;

[0023] 2- stator assembly; 20- stator frame; 200- stator frame sleeve; 201- support ring; 202- stator through hole; 203- groove; 21- enameled wire assembly;

[0024] 3-rotor assembly; 30-motor housing; 300-motor bottom housing; 301-second bearing frame; 31-motor upper cover; 310-first bearing frame; 311-spindle through hole; 312-slide rod; 313-fixing screw hole; 314-fixing through hole; 32-fan blade connecting frame; 320-installing screw hole; 33-bolt. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings. Figure 1 — Figure 4 :

[0026] A permanent magnet brushless motor for a ceiling fan comprises a main shaft 1, on which a stator group 2 and a rotor group 3 are arranged, the stator group 2 comprises a stator frame 20 fixed on the main shaft 1, an enameled wire group 21 is arranged on the outer side of the stator frame 20, a first bearing 10 and a second bearing 11 are respectively fixed on the main shaft 1, and the stator frame 20 is located between the first bearing 10 and the second bearing 11, the rotor group 3 comprises a motor housing 30 with an upper opening, a motor upper cover 31 for sealing the upper opening is provided on the upper cover of the motor housing 30, a first bearing frame 310 for embedding the first bearing 10 is formed in the middle of the motor upper cover 31, a main shaft through hole 311 for the main shaft 1 to extend is opened in the middle of the first bearing frame 310, the motor housing 30 comprises a motor bottom shell 300, an upper end surface of the motor bottom shell 300 is formed with a second bearing frame 301 for embedding with the second bearing 11, and a plurality of fan blade connecting frames 32 are axially fixed above the motor upper cover 31.

[0027] During the implementation process, the motor housing 30 and the motor cover 31 in the rotor group 3 rotate. During the rotation process, the stator group 2 always remains stationary. The parts of the rotating rotor group 3 that are in contact with the main shaft are offset from the main shaft through the first bearing and the second bearing, which ensures stability while reducing friction with the main shaft and greatly reducing noise. In addition, the main shaft will also have less wear, ensuring long-term use.

[0028] Preferably, the stator frame 20 includes a stator frame sleeve 200 sleeved on the main shaft 1, the outer wall of the stator frame sleeve 200 extends outward and is formed with a circular support ring 201, the outer edge of the support ring 201 is formed with the enameled wire group 21, and the middle part of the support ring 201 extends outward and gradually decreases in thickness.

[0029] In the above structure, the thicker design in the middle portion reduces the centrifugal force of the outer wall of the outer rotor when acting on the enameled coil, thereby reducing the vibration of the main shaft and further reducing the noise.

[0030] Preferably, the support ring 201 is evenly distributed with a plurality of stator through holes 202, and corresponding grooves 203 are formed on the upper and lower parts of the support ring 201, and the stator through holes 202 are opened in the grooves 203. This reduces the weight of the stator frame, further reduces vibration, and improves the mute effect.

[0031] Preferably, the upper end of the motor upper cover 31 is evenly distributed with a plurality of sliding rods 312 that spread outward, and the lower end of the fan blade connecting frame 32 is slidably arranged on the upper end of the sliding rod 312. The sliding rod 312 and the fan blade connecting frame 32 can be slidably adapted to provide a length selection when installing the fan blade.

[0032] Preferably, a plurality of fixing screw holes 313 are provided at the upper end of the slide rod 312 , and a plurality of mounting screw holes 320 are provided on the fan blade connecting frame 32 . The mounting screw holes 320 are fixed in the fixing screw holes 313 by bolts 33 .

[0033] In the above structure, the plurality of fixing screw holes 313 and the plurality of mounting screw holes 320 can provide more stable locking.

[0034] Preferably, a fixing through hole 314 is provided on the main shaft 1 extending out of the motor upper cover 31, and an oblique through hole 12 communicating with the motor housing 30 is provided on the main shaft 1. The fixing through hole 314 can fix the main shaft during use to prevent it from falling; and the oblique through hole 12 is used for the insertion of the wire.

[0035] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A permanent magnet brushless motor for a ceiling fan, comprising a main shaft (1), on which a stator assembly (2) and a rotor assembly (3) are arranged, characterized in that: The stator assembly (2) comprises a stator frame (20) fixed on the main shaft (1), an enameled wire assembly (21) is arranged on the outer side of the stator frame (20), a first bearing (10) and a second bearing (11) are respectively fixed on the main shaft (1), and the stator frame (20) is located between the first bearing (10) and the second bearing (11), the rotor assembly (3) comprises a motor housing (30) with an upper opening, a motor upper cover (31) is provided on the upper cover of the motor housing (30) for sealing the upper opening, and the motor A first bearing frame (310) for engaging the first bearing (10) is formed in the middle of the upper cover (31), and a main shaft through hole (311) for the main shaft (1) to extend is opened in the middle of the first bearing frame (310). The motor housing (30) includes a motor bottom housing (300), and a second bearing frame (301) for engaging the second bearing (11) is formed on the upper end surface of the motor bottom housing (300). A plurality of fan blade connecting frames (32) are axially fixed above the motor upper cover (31).

2. A permanent magnet brushless motor for a ceiling fan according to claim 1, characterized in that: The stator frame (20) comprises a stator frame sleeve (200) sleeved on the main shaft (1); the outer wall of the stator frame sleeve (200) extends outward and is formed with a circular support ring (201); the outer edge of the support ring (201) is formed with the enameled wire group (21); the middle part of the support ring (201) extends outward and its thickness gradually decreases.

3. A permanent magnet brushless motor for a ceiling fan according to claim 2, characterized in that: The support ring (201) is evenly distributed with a plurality of stator through holes (202); corresponding grooves (203) are formed on the upper and lower parts of the support ring (201), and the stator through holes (202) are opened in the grooves (203).

4. A permanent magnet brushless motor for a ceiling fan according to claim 1, characterized in that: The upper end of the motor upper cover (31) is evenly distributed with a plurality of sliding rods (312) that spread outwards, and the lower end of the fan blade connecting frame (32) is slidably arranged on the upper end of the sliding rods (312).

5. A permanent magnet brushless motor for a ceiling fan according to claim 4, characterized in that: The upper end of the slide rod (312) is provided with a plurality of fixing screw holes (313), and the fan blade connecting frame (32) is provided with a plurality of mounting screw holes (320). The mounting screw holes (320) are fixed in the fixing screw holes (313) by bolts (33).

6. A permanent magnet brushless motor for a ceiling fan according to claim 1, characterized in that: A fixing through hole (314) is provided on the main shaft (1) extending out of the motor upper cover (31), and an oblique through hole (12) communicating with the motor housing (30) is provided on the main shaft (1).

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