CN210167931U

CN210167931U - Motor, dust collector rolling brush with motor and household appliance

Info

Publication number: CN210167931U
Application number: CN201921013848.2U
Authority: CN
Inventors: 梁毅明; 李静; 梁政恒
Original assignee: Johnson Electric International AG
Current assignee: Johnson Electric International AG; Johnson Electric Guangdong Co Ltd
Priority date: 2019-07-01
Filing date: 2019-07-01
Publication date: 2020-03-20
Anticipated expiration: 2029-07-01

Abstract

The utility model relates to the technical field of electric motor, a motor is disclosed, including the stator with set up in but in the stator is relative stator pivoted rotor, the stator includes the casing of tube-shape, set up in the brush of casing one end and be fixed in the inboard permanent magnet of casing, the rotor includes the pivot, is fixed in epaxial rotor magnetic core and commutator and around establishing the winding that is connected on the rotor magnetic core and with the commutator electricity, the motor is low pressure DC motor, and operating voltage is 7-36V, permanent magnet is ferrite magnet, the external diameter of rotor magnetic core with the ratio of the external diameter of casing is 67% -72%. The utility model also provides a dust catcher round brush and domestic appliance including aforementioned motor. The utility model discloses a motor power density is high, satisfies light-duty, miniaturization and low-cost demand.

Description

Motor, dust collector rolling brush with motor and household appliance

Technical Field

The utility model relates to the technical field of motors, concretely relates to motor and have dust catcher round brush and domestic appliance of this motor.

Background

The vacuum cleaner is internally provided with a plurality of motors, however, along with the development of miniaturization and light weight of the vacuum cleaner, the size and the weight of the existing motor are often larger under the condition that the power and the service life of the existing motor meet the requirements, or the power and the service life of the motor under the limited size requirement can not meet the requirements.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is directed to a motor, a vacuum cleaner roller brush and a household appliance having the same, which can solve the above problems to some extent.

Therefore, the utility model discloses an aspect provides a motor, including the stator with set up in but in the stator relative stator pivoted rotor, the stator includes the casing of tube-shape, set up in the brush of casing one end and be fixed in the inboard permanent magnet of casing, the rotor includes the pivot, is fixed in epaxial rotor magnetic core and commutator and around establishing on the rotor magnetic core and the winding of being connected with the commutator electricity, the motor is low voltage direct current motor, and operating voltage is 7-36V, permanent magnet is ferrite magnet, the external diameter of rotor magnetic core with the external diameter of casing compares for 67% -72%.

In some embodiments, a ratio of an outer diameter of the rotor core to an outer diameter of the housing is 67.7% -72%.

In some embodiments, the maximum energy product BHmax of the ferrite magnet is 35.1-38.3KJ/m³。

In some embodiments, the residual magnetic induction Br of the ferrite magnet is 430-450mT, the coercive force Hcb is 246.7-270.5kA/M, and the intrinsic coercive force Hcj is 250.7-274.5 kA/M.

In some embodiments, the outer diameter of the housing is 24.4 ± 0.3mm, and the outer diameter of the rotor core is 16.9 ± 0.3 mm.

In some embodiments, the thickness of the permanent magnet is 2.6 ± 0.3 mm.

In some embodiments, the length of the permanent magnet is 14.2 ± 2 mm.

In some embodiments, the housing has a length of 36.5 ± 2mm, and the rotor core has a length of 12 ± 2 mm.

In some embodiments, the permanent magnet has 2 poles and the rotor core has 5 winding slots.

In some embodiments, the wire of the winding has a diameter of 0.1-0.5 mm.

In some embodiments, the rated output power of the motor is 15 watts.

On the other hand, the utility model also provides a dust catcher round brush including aforementioned motor.

In another aspect, the present invention further provides a household appliance including the motor.

The utility model provides a motor is 67% -72% for control with the ratio of the external diameter of rotor magnetic core and the external diameter of casing under the prerequisite of guaranteeing sufficient magnetic performance for under the condition of the same motor power, the utility model discloses a size of motor is littleer than current motor. On the other hand, under the condition of the same motor size, the utility model discloses a rotor core's of motor size is bigger, can hold more rotor windings, and then can obtain higher output. In addition, ferrite magnets are less expensive than rare earth magnets, and therefore the cost of the motor is also lower.

Drawings

Fig. 1 is a perspective view of a motor according to an embodiment of the present invention.

Fig. 2 is an exploded schematic view of the motor of fig. 1, with the windings not shown.

Fig. 3 is an exploded schematic view from another perspective of the motor shown in fig. 1, with the windings not shown.

Fig. 4 is a longitudinal sectional view of the motor shown in fig. 1.

Fig. 5 is a transverse cross-sectional view of the motor shown in fig. 1, with the windings not shown.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, so that the technical solutions and the advantages thereof will be more clearly understood. It is to be understood that the drawings are provided for purposes of illustration and description only and are not intended as a definition of the limits of the invention, but the dimensions shown in the drawings are for convenience and are not to be taken as limiting the scale.

Referring to fig. 1 to 4, an electric machine according to an embodiment of the present invention includes a stator and a rotor 20 rotatable with respect to the stator. The stator has a receiving cavity 10 formed therein for receiving the rotor 20.

The rotor 20 includes a rotating shaft 21, a rotor core 22 and a commutator 23 fixed to the rotating shaft 21, and a winding (not shown) wound around the rotor core 22 and electrically connected to the commutator 23.

The stator includes a hollow cylindrical housing 11 having an open end, a permanent magnet 12 fixed to the inside of the housing 11, and an end cap 13 fixed to the open end of the housing 11. The end cap 13 includes a base 14, a terminal 15 fixed to the base 14, and a brush 16 slidably disposed on the base 14. A receiving cavity 140 is formed at the center of the base 14 for receiving the commutator 23 of the rotor 20, and the brush 16 is in sliding contact with the commutator 23.

When supplying current to the terminal 15, the terminal 15 may transfer current through the shunt 17 to the brush 16 and via the brush 16 to the commutator 23 of the rotor 20 and thus to the windings of the rotor 20. Preferably, the motor in this embodiment is a low-voltage dc motor, and when the motor works, the working voltage is 7-36V. More preferably, the operating voltage of the motor is 8-12.5V.

In this embodiment, the permanent magnet 12 is two pieces, forming 2 magnetic poles. A slingshot is disposed between the circumferential directions of the two permanent magnets 12 and fixed to the inner wall of the housing 11. In the present embodiment, the material of the permanent magnet 12 is a high grade ferrite, and more preferably, the grade thereof is 6N. Preferably, the maximum energy product BHmax of the permanent magnet 12 is 35.1-38.3KJ/m³The residual magnetic induction Br is 430-450mT, the coercive force Hcb is 246.7-270.5 kA-M and the intrinsic coercive force Hcj is 250.7-274.5 kA/M. Preferably, the thickness of the permanent magnet 12 is 2.6 ± 0.3 mm. The length of the permanent magnet 12 is preferably 14.2 ± 2 mm.

In this embodiment, the rotor core 22 is formed by stacking a plurality of rotor laminations. As shown in fig. 5, the rotor core 22 includes a substantially annular yoke portion 220 and a plurality of tooth portions 221 connected to the circumferential outer side of the yoke portion 220. The yoke 220 has a center closely fitted to the rotation shaft 21. The tooth portion 221 includes a tooth body 222 connected to the yoke portion 220, and a tooth crown 223 connected to a radially outer end of the tooth body 222. In this embodiment, the number of the teeth 221 is 5. A winding slot 224 is formed between adjacent teeth 221 for receiving a winding. In other words, in the present embodiment, the rotor core 22 has 5 winding slots 224. The tooth body 222 is substantially rectangular. Each set of windings is correspondingly wound on a corresponding tooth body 222. The diameter of the wire of the winding may be 0.1-0.5mm, preferably 0.2-0.3 mm. The crown 223 is generally arcuate in shape extending in the circumferential direction. The radially outer side faces of all the crowns 223 are on the same cylindrical surface. In other embodiments, the number of teeth of the rotor core may also be, for example, 10.

Since the permanent magnet 12 in the present embodiment uses a higher-grade ferrite magnet, the thickness of the magnet can be reduced while ensuring sufficient magnetic properties, which can increase the size of the rotor core. Thereby, the motor may provide more space to accommodate more rotor windings, resulting in higher output power. Further, the degree of temperature rise during operation of the motor can be reduced due to the greater thermal mass, and the copper loss of the motor can also be reduced by allowing thicker wires to be used for the rotor windings. In addition, the permanent magnet 12 in the present embodiment is lower in cost than the rare earth magnet, and therefore the motor is also lower in cost. In this embodiment, the ratio of the outer diameter D1 of the rotor core 22 to the outer diameter D2 of the housing 11 is 67% to 72%. Preferably, the outer diameter D2 of the housing 11 is 24.4 ± 0.3mm, and the outer diameter D1 (i.e., the diameter of the radially outer side surface of all the crowns 223) of the rotor core 22 is 16.9 ± 0.3 mm. In the present embodiment, the length of the housing 11 is preferably 36.5 ± 2 mm. The length of the rotor core 22 is preferably 12 ± 2 mm. In other embodiments, the ratio of the outer diameter D1 of the rotor core to the outer diameter D2 of the housing may be 67.7% to 72%, and preferably, the ratio of the outer diameter D1 of the rotor core to the outer diameter D2 of the housing may be 67.7% to 71%. In this embodiment, the rated output power of the motor is 15W.

The motor in the embodiment is suitable for household appliances, in particular to a rolling brush of a vacuum cleaner.

The above description is only a preferred embodiment of the present invention, the protection scope of the present invention is not limited to the above listed embodiments, any person skilled in the art can obviously obtain simple changes or equivalent substitutions of the technical solutions within the technical scope of the present invention.

Claims

1. A motor comprises a stator and a rotor which is arranged in the stator and can rotate relative to the stator, wherein the stator comprises a cylindrical shell, an electric brush arranged at one end of the shell and a permanent magnet fixed on the inner side of the shell, the rotor comprises a rotating shaft, a rotor magnetic core and a commutator which are fixed on the rotating shaft and a winding which is wound on the rotor magnetic core and is electrically connected with the commutator, and the motor is characterized in that the motor is a low-voltage direct-current motor, the working voltage is 7-36V, the permanent magnet is a ferrite magnet, and the ratio of the outer diameter of the rotor magnetic core to the outer diameter of the shell is 67-72%.

2. The electric machine of claim 1, wherein a ratio of an outer diameter of the rotor core to an outer diameter of the housing is 67.7% -72%.

3. The machine of claim 1, wherein the ferrite magnets have a maximum energy product BHmax of 35.1-38.3KJ/m³。

4. The motor of claim 3, wherein the ferrite magnet has a residual magnetic induction Br of 430-450mT, a coercive force Hcb of 246.7-270.5kA/M, and an intrinsic coercive force Hcj of 250.7-274.5 kA/M.

5. The electric machine according to any of claims 1-4, wherein the outer diameter of the housing is 24.4 ± 0.3mm and the outer diameter of the rotor core is 16.9 ± 0.3 mm.

6. The machine of claim 5, wherein the permanent magnets have a thickness of 2.6 ± 0.3 mm.

7. The machine of claim 5, wherein the length of the permanent magnets is 14.2 ± 2 mm.

8. The electric machine of claim 5, wherein the housing has a length of 36.5 ± 2mm and the rotor core has a length of 12 ± 2 mm.

9. The machine of claim 1, wherein the permanent magnet has 2 poles and the rotor core has 5 winding slots.

10. An electrical machine according to claim 1, wherein the wires of the windings have a diameter of 0.1-0.5 mm.

11. The electric machine of claim 1, wherein the rated output power of the electric machine is 15 watts.

12. A vacuum cleaner roller brush, characterized in that it comprises a motor according to any one of claims 1-4.

13. A household appliance, characterized in that it comprises an electric machine according to any one of claims 1 to 4.