CN212935643U

CN212935643U - Roller shutter and permanent magnet direct current motor thereof

Info

Publication number: CN212935643U
Application number: CN202021690177.6U
Authority: CN
Inventors: 李越; 周垂有; 李兆荣; 胡宏亮; 兰金华; 韦博希; 朱晓宁
Original assignee: Johnson Electric International AG
Current assignee: Johnson Electric International AG
Priority date: 2020-08-13
Filing date: 2020-08-13
Publication date: 2021-04-09
Anticipated expiration: 2030-08-13

Abstract

The utility model relates to a roller shutter and a permanent magnet direct current motor thereof, wherein the permanent magnet direct current motor comprises a stator and a rotor; the stator includes a housing and a stator magnet mounted to an inner wall of the housing; the rotor comprises a rotating shaft, a rotor magnetic core fixedly sleeved on the rotating shaft and a rotor winding wound on the rotor magnetic core and connected to the commutator, and the rotor magnetic core is surrounded by the stator magnet; the rotor magnetic core comprises a central part fixedly sleeved on the rotating shaft and 6 rotor teeth extending outwards from the central part, and a wire slot is formed between every two adjacent rotor teeth and used for accommodating the rotor winding; the stator magnet includes 4 stator poles. The utility model discloses can reduce vibration and noise effectively.

Description

Roller shutter and permanent magnet direct current motor thereof

[ technical field ] A method for producing a semiconductor device

The utility model relates to the technical field of motors, more specifically relates to a roll up curtain and permanent magnet direct current motor thereof.

[ background of the invention ]

A permanent magnet dc motor is a dc motor that uses permanent magnets to create a magnetic field. Different application fields have different requirements on the performance of the permanent magnet direct current motor, for example, the permanent magnet direct current motor in the industrial field should have better reliability, and the permanent magnet direct current motor used in the household field should be quieter. The existing permanent magnet direct current motor comprises a stator and a rotor, wherein the stator comprises a cylindrical shell and a permanent magnet arranged on the inner wall of the shell, and the permanent magnet forms two magnetic poles, so that the efficiency is low; the rotor includes that pivot, fixed cover are established the rotor magnetic core of pivot, rotor magnetic core adopt the three-groove structure, and magnetism pulling force is unbalanced, and the vibration is big, and the noise is big.

[ Utility model ] content

An object of the utility model is to provide a roll up curtain and permanent magnet direct current motor thereof can effectively balance the magnetism pulling force, reduces the noise that the motor during operation produced.

The utility model provides a permanent magnet direct current motor, which comprises a stator and a rotor; the stator includes a housing and a stator magnet mounted to an inner wall of the housing; the rotor comprises a rotating shaft, a rotor magnetic core fixedly sleeved on the rotating shaft and a rotor winding wound on the rotor magnetic core and connected to the commutator, and the rotor magnetic core is surrounded by the stator magnet; the rotor magnetic core comprises a central part fixedly sleeved on the rotating shaft and 6 rotor teeth extending outwards from the central part, and a wire slot is formed between every two adjacent rotor teeth and used for accommodating the rotor winding; the stator magnet includes 4 stator poles.

As a preferred technical scheme, the rotor teeth comprise tooth bodies and tooth crowns positioned at the outer ends of the tooth bodies; the distance between the tooth crowns of two adjacent rotor teeth is used as the notch width of the wire slot between the two rotor teeth, and the ratio of the notch width to the outer diameter of the rotor magnetic core is 0.1-0.2.

As an optimal technical scheme, the rated output power of the permanent magnet direct current motor is 4-20 watts.

As a preferable technical scheme, the stator magnet is a ring body, and the thickness of an air gap between the stator magnet and the rotor magnetic core is uniform.

According to the preferable technical scheme, the outer diameter of the shell is 18-24 mm, and the outer diameter of the rotor magnetic core is 12-18 mm.

As a preferable technical solution, the commutator segment of the commutator is electrically connected with the rotor winding; the stator further comprises an end cover and two electric brushes mounted on the end cover, and the two electric brushes are vertically arranged and elastically abut against the commutator segments of the commutator.

As a preferred technical scheme, the commutator comprises an elastic conductive brush arm, one end of the brush arm is mounted on the end cover and is in contact with a conductive terminal fixed on the end cover to form electric connection, the other end of the brush arm is a free end, and the free end is provided with the electric brush and enables the electric brush to elastically abut against a commutator segment of the commutator.

As a preferred technical solution, the brush arm is a sheet, and the permanent magnet dc motor further includes a damping sheet attached to the brush arm.

As a preferable technical scheme, the number of the commutator segments is equal to the number of the wire slots.

The utility model also provides a roller shutter, include as above arbitrary permanent magnet direct current motor.

The utility model discloses an electron magnetic ring becomes 4 magnetic poles, and the rotor magnetic core includes 6 rotor teeth for the motor has better balanced magnetism pulling force, reduces vibration and noise enough effectively.

[ description of the drawings ]

Fig. 1 is a schematic structural diagram of a permanent magnet dc motor according to an embodiment of the present invention;

FIG. 2 is an exploded view of the permanent magnet DC motor of FIG. 1;

FIG. 3 is a schematic cross-sectional view of the permanent magnet DC motor of FIG. 1;

fig. 4 is an exploded schematic view of a rotor of the permanent magnet dc motor of fig. 1;

FIG. 5 is a schematic structural view of the end cap, brush arm, and conductive terminal of the permanent magnet DC motor shown in FIG. 1 mounted together;

FIG. 6 is an exploded view of the end cap, brush arm and conductive terminal of FIG. 5;

FIG. 7 is a schematic top view of a stator magnet and a rotor core of the permanent magnet DC motor of FIG. 1;

fig. 8 is a schematic top view of the housing, stator magnets and rotor core of the permanent magnet dc motor of fig. 1;

fig. 9 is a schematic structural diagram of a rotor core of the permanent magnet dc motor shown in fig. 1.

[ detailed description ] embodiments

The invention is further described with reference to the following figures and examples.

Referring to fig. 1, a permanent magnet dc motor 100 according to an embodiment of the present invention can be applied to many fields, can meet the application requirement of a wide load range, and is particularly suitable for a curtain driver. The rated output power of the permanent magnet direct current motor 100 is 4-20 watts. The permanent magnet dc motor 100 includes a stator 20 and a rotor 50 rotatably mounted to the stator 20.

Referring to fig. 1 to 4, the stator 20 includes a cylindrical case 21 having one end opened, a stator magnet 23 mounted to an inner wall of the case 21, an end cap 25 mounted to the open end of the case 21, and an end cover plate 24 fixing the end cap 25 to the open end of the case 21. The end cap 25 is provided with two brush arms 28, and each brush arm 28 is provided with a corresponding brush 27 (see fig. 5 and 6). The end cap 25 also mounts two conductive terminals 30 for connection to an external power source, each conductive terminal 30 being electrically connected to a corresponding brush 27 by a corresponding brush arm 28.

The stator magnet 23 is a ring body. The stator magnet 23 forms 4 stator poles. The stator magnet 23 may be bonded neodymium iron boron, and the magnet is an inner magnetizing magnet, so that the cogging torque can be adjusted by adopting different magnetizing angles.

As shown in connection with fig. 5 and 6, the brush arms 28 are both resilient, electrically conductive brush arms. One end of the brush arm 28 is mounted to the end cap 25 and is electrically connected to the corresponding conductive terminal 30, and the other end of the brush arm 28 is a free end having an opening, and the inner wall of the opening is provided with a resilient piece for holding the brush 27. The two brushes 27 are at a 90 ° angle.

Preferably, the brush arm 28 is a plate, and a damping plate 29 is attached to one surface of the brush arm 28 to reduce vibration of the brush 27 and the brush arm 28 during operation of the motor 100, thereby further reducing noise.

Preferably, the end cap 25 has a receiving cavity 251, the first ends of the two conductive terminals 30 each have a V-shaped bent portion and are respectively mounted on the corresponding V-shaped mounting portion 253 in the receiving cavity 251, one end of the brush arm 28 is also mounted in one of the mounting slots of the V-shaped mounting portion 253, the V-shaped bent portion is provided with a protrusion, the brush arm 28 is provided with a slot corresponding to the protrusion, and the protrusion extends into the slot to fix the brush arm 28 and the V-shaped bent portion. Of course, in other embodiments, the protrusions may be disposed on the brush arm 28 and the corresponding slots may be disposed on the V-shaped bent portion. The second ends of the two conductive terminals 30 respectively penetrate through one end of the end cover 25 close to the end cover plate 24 and extend out of the end cover plate 24 for connecting with an external power supply, so as to supply power to the corresponding brushes 27 through the corresponding brush arms 28.

The rotor 50 includes a rotation shaft 51, a rotor core 53 fixedly sleeved on the rotation shaft 51, a commutator 55 fixedly sleeved on the rotation shaft 51, and a rotor winding 57 wound around the rotor core 53 and electrically connected to the commutator 55. An insulating frame 59 is mounted to the rotor core 53 and positioned between the rotor core 53 and the rotor winding 57 for insulating the two.

The rotation shaft 51 is supported by the bushing 22 mounted to the closed end of the housing 21 and the bushing 26 mounted to the end cover plate 24 so that the rotor 50 can rotate relative to the stator 20. The closed end of the housing 21 and the end cover plate 24 are provided with bushing

mounting portions

211, 241 for mounting the

bushings

22, 26, respectively. The

bushings

22, 26 may also be replaced with bearings.

A sleeve part 591 is formed at one end of the insulation frame 59 close to the closed end of the housing 21, a positioning ring 61 is arranged between the sleeve part 591 and the bushing 22 mounted at the closed end of the housing 21, a gasket 62 is arranged between the positioning ring 61 and the bushing 22, and the positioning ring 61 and the gasket 62 are fixedly sleeved on the rotating shaft 51.

As shown in connection with fig. 7, the rotor core 53 is surrounded by the stator magnet 23. An air gap 71 is formed between the stator magnet 23 and the rotor core 53, the thickness of the air gap 71 is uniform, and the thickness of the air gap 71 is 0.2-0.5 mm.

The rotor core 53 includes a central portion 531 fixedly fitted to the rotation shaft 51 and 6 rotor teeth 533 protruding outward from the central portion 531.

The center portion 531 has a mounting hole 532 to be fixedly fitted to the rotation shaft 51. The mounting holes are in interference fit with the rotating shaft, so that the rotor magnetic core 53 can be prevented from rotating relative to the rotating shaft 51, and a plurality of grooves 532a are formed in the inner wall of the mounting holes 532, so that the pressure of the rotating shaft pressed into the magnetic core 53 can be adjusted.

The 6 rotor teeth 533 are uniformly distributed in the circumferential direction of the center portion 531. A slot 534 is formed between two adjacent rotor teeth 533 for receiving the rotor winding 57. 6 rotor teeth 533 form 6 wire casings 534, and stator magnet 23 magnetizes into 4 stator poles, therefore the utility model discloses a motor 100 is 4 utmost points 6 groove motors, 2 utmost points 3 groove motors traditional relatively, and it has better balanced magnetic pull, can reduce vibration and noise.

The rotor teeth 533 include a tooth body 533a projecting outward in the radial direction of the central portion 531, and a crown 533b located at an outer end of the tooth body 533a (i.e., an outer end of the tooth body 533a away from the central portion 531). The inner side surface 533d of the crown 533b is planar and perpendicular to the body 533 a. The air gap 71 is formed between the outer side surface 533c of the crown 533b and the inner side surface 23a of the stator magnet 23.

As shown in fig. 8, the distance between the tooth crowns 533b of two adjacent rotor teeth 533 is defined as the width W1 of the notch 534a of the wire groove 534 between the two rotor teeth 533. The ratio of the width W1 of the notch 534a to the outer diameter of the rotor core 53 is 0.1 to 0.2, so that a proper cogging torque is obtained.

As shown in fig. 9, the rotor core 53 is formed by stacking a plurality of lamination sheets 536 in sequence.

Commutator 55 is located between end cap 25 and rotor core 53. The commutator 55 includes an insulator 551 fixedly fitted to the rotation shaft 51 and a plurality of commutator segments 553 uniformly arranged on an outer side surface of the insulator 551 in a circumferential direction of the insulator 551. Preferably, the number of segments 553 is equal to the number of slots 534, i.e., 6 segments 553. In other embodiments, the number of commutators may be other values, such as the number of segments 553 is equal to twice the number of slots 534.

A positioning ring 63 is arranged between the insulator 551 and the bushing 26 mounted on the end cover plate 24, a washer 64 is arranged between the positioning ring 63 and the insulator 551, and the positioning ring 63 and the washer 64 are fixedly sleeved on the rotating shaft 51. The positioning rings 61 and 63 are used to position the rotor core 53 and the commutator 55.

Commutator segments 553 are electrically connected to the rotor winding 57. Preferably, one end of the commutator segment 553 near the rotor core 53 is formed with a hook portion 554 (see fig. 4), and the hook portion 554 is electrically connected to the rotor winding 57. The two brushes 27 elastically abut against the commutator segments 553 under the action of the corresponding elastic conductive brush arms 28, so as to be electrically connected with the commutator segments 553, so that power can be supplied to the rotor winding 57 through the conductive terminals 30, and after the rotor winding 57 is energized, the rotor 50 can rotate relative to the stator 20 under the action of the magnetic field of the stator 20, so as to output power.

The above examples only represent preferred embodiments of the present invention, which are described in more detail and detail, but are not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the concept of the present invention, several variations and modifications can be made, such as combinations of different features in the various embodiments, which are within the scope of the present invention.

Claims

1. A permanent magnet direct current motor comprises a stator and a rotor; the stator includes a housing and a stator magnet mounted to an inner wall of the housing; the rotor comprises a rotating shaft, a rotor magnetic core fixedly sleeved on the rotating shaft and a rotor winding wound on the rotor magnetic core and connected to the commutator, and the rotor magnetic core is surrounded by the stator magnet; the rotor magnetic core is characterized by comprising a central part fixedly sleeved on the rotating shaft and 6 rotor teeth extending outwards from the central part, and a wire slot is formed between every two adjacent rotor teeth and used for accommodating the rotor winding; the stator magnet includes 4 stator poles.

2. The permanent magnet dc motor of claim 1, wherein the rotor teeth comprise a tooth body and a tooth crown at an outer end of the tooth body; the distance between the tooth crowns of two adjacent rotor teeth is used as the notch width of the wire slot between the two rotor teeth, and the ratio of the notch width to the outer diameter of the rotor magnetic core is 0.1-0.2.

3. The permanent magnet direct current motor according to claim 1, wherein the rated output power of the permanent magnet direct current motor is 4 to 20 watts.

4. The permanent magnet dc motor of claim 1, wherein the air gap between the stator magnets and the rotor core is of uniform thickness.

5. The permanent magnet direct current motor according to claim 4, wherein the outer diameter of the housing is 18 to 24mm, and the outer diameter of the rotor core is 12 to 18 mm.

6. The permanent magnet dc motor of claim 1, wherein the segments of the commutator are electrically connected to the rotor winding; the stator further comprises an end cover and two electric brushes mounted on the end cover, and the two electric brushes are vertically arranged and elastically abut against the commutator segments of the commutator.

7. The permanent magnet direct current motor according to claim 6, further comprising an elastic conductive brush arm, one end of the brush arm is mounted to the end cap and is in contact with a conductive terminal fixed to the end cap to form an electrical connection, and the other end is a free end, the free end is mounted with the brush and enables the brush to elastically abut against a commutator segment of the commutator.

8. The permanent magnet dc motor according to claim 7, wherein the brush arm is a plate, the permanent magnet dc motor further comprising a damper plate attached to the brush arm.

9. The permanent magnet direct current motor of claim 6, wherein the number of segments is equal to the number of slots.

10. A roller shutter comprising a permanent magnet dc motor as claimed in any preceding claim.