CN106257805B - Low-voltage direct-current motor, dust collector rolling brush and household appliance - Google Patents

Low-voltage direct-current motor, dust collector rolling brush and household appliance Download PDF

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Publication number
CN106257805B
CN106257805B CN201610244005.8A CN201610244005A CN106257805B CN 106257805 B CN106257805 B CN 106257805B CN 201610244005 A CN201610244005 A CN 201610244005A CN 106257805 B CN106257805 B CN 106257805B
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Prior art keywords
motor
rotor
outer diameter
low voltage
low
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CN201610244005.8A
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CN106257805A (en
Inventor
卢明岑
罗志强
梁毅明
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Dechang Motor (Shenzhen) Co Ltd
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Dechang Motor (Shenzhen) Co Ltd
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Priority to DE102016111076.0A priority Critical patent/DE102016111076A1/en
Priority to US15/185,492 priority patent/US10218230B2/en
Publication of CN106257805A publication Critical patent/CN106257805A/en
Priority to US16/231,075 priority patent/US20190222075A1/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K23/00—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
    • H02K23/40—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by the arrangement of the magnet circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/02—Details of the magnetic circuit characterised by the magnetic material
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/17—Stator cores with permanent magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/26—Rotor cores with slots for windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/14—Means for supporting or protecting brushes or brush holders
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2203/00—Specific aspects not provided for in the other groups of this subclass relating to the windings
    • H02K2203/06—Machines characterised by the wiring leads, i.e. conducting wires for connecting the winding terminations
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc Machiner (AREA)

Abstract

The invention discloses a low-voltage direct current motor, a dust collector rolling brush and a household appliance. The motor comprises a stator and a rotor rotating relative to the stator, wherein the rotor comprises a rotating shaft, a rotor magnetic core fixed on the rotating shaft, a commutator fixed on the rotating shaft and adjacent to the rotor magnetic core, and a rotor winding wound on the pole part of the rotor magnetic core and electrically connected with the commutator, the stator comprises a cylindrical shell, a permanent magnet arranged on the inner surface of the shell, and an electric brush in sliding contact with the commutator, the input voltage of the motor is in the range of 7-36V, and the ratio of the outer diameter of the rotor magnetic core to the outer diameter of the shell is 67-75%. The embodiment of the invention can improve the output power of the motor on the premise of not increasing the size of the motor.

Description

Low-voltage direct-current motor, dust collector rolling brush and household appliance
Technical Field
The present invention relates to a permanent magnet motor particularly suitable for use in a domestic appliance such as a hand-held cleaner.
Background
Motors are currently used in many devices and equipment. Many appliances (e.g., household appliances such as hand-held cleaners) desire smaller, lighter, and more powerful motors to reduce the size of the appliance while meeting the same performance, or to increase the motor power without increasing the size of the appliance to increase the performance of the appliance.
Some existing household appliances adopt low-voltage direct current motors. The low voltage DC motor includes a stator and a rotor. The stator has a cylindrical housing and permanent magnets fixed to an inner surface of the housing. The rotor has a rotor core, and a rotor coil wound around the rotor core. The rotor windings are supplied by a low voltage dc voltage. In a conventional 300 series low voltage dc motor, the outer diameter of the motor housing is about 27.6mm, the outer diameter of the rotor core is about 18mm, and the ratio of the outer diameter of the rotor core to the outer diameter of the motor housing is about 65.2%, and when the input voltage of the motor is 16.2V, the rated output power of the motor is generally less than 30 w.
The invention aims to provide a novel low-voltage direct current motor which can provide higher output power under the condition of not increasing the size of a shell.
Disclosure of Invention
An embodiment of the present invention provides a low voltage dc motor, including a stator and a rotor rotating relative to the stator, wherein the rotor includes a rotating shaft, a rotor core fixed to the rotating shaft, a commutator fixed to the rotating shaft and adjacent to the rotor core, and a rotor winding wound around a pole portion of the rotor core and electrically connected to the commutator, the stator includes a barrel-shaped housing, a permanent magnet mounted on an inner surface of the housing, and a brush in sliding contact with the commutator, an input voltage of the motor is in a range of 7 to 36V, and a ratio of an outer diameter of the rotor core to an outer diameter of the housing is 67% to 75%.
Preferably, the ratio of the outer diameter of the rotor core to the outer diameter of the housing is 67.6% to 73.8%.
Preferably, the permanent magnet is a ferrite magnet.
Preferably, the maximum magnetic energy product value BHmax of the ferrite magnet is 35.8 +/-1.6 kj/m3Is made of the material of (1).
Preferably, the ferrite magnet is made of a material with residual magnetic induction Br of 430 +/-10 mT, coercive force Hcb of 318.5 +/-7.9 kA/m and intrinsic coercive force Hcj of 358.3 +/-7.9 kA/m.
Preferably, the ferrite magnet has a maximum energy product value BHmax of34.2±1.6kj/m3Is made of the material of (1).
Preferably, the ferrite magnet is made of a material with residual magnetic induction Br of 430 +/-10 mT, coercive force Hcb of 258.7 +/-7.9 kA/m and intrinsic coercive force Hcj of 270.7 +/-7.9 kA/m.
Preferably, the outer diameter of the housing is 27.5mm ± 0.3mm, and the outer diameter of the rotor magnetic core is 19mm ± 0.2 mm.
Preferably, the axial length of the magnet is 21.0mm +/-2.1 mm, 27.5mm +/-0.3 mm or 34mm +/-0.3 mm, and the rated output power of the motor can reach 20 watts, 50 watts or 80 watts respectively.
Preferably, the rotor magnetic core has 5 or 10 pole parts, the stator has 2 permanent magnet poles, and the commutator has 5 commutator segments.
Optionally, the diameter of the wire of the rotor winding of the low-voltage direct-current motor is within a range of 0.1mm to 0.5 mm.
Preferably, the diameter of the lead of the rotor winding of the low-voltage direct current motor is within the range of 0.3 mm-0.35 mm.
Another aspect of the present invention provides a vacuum cleaner roller brush driven by the above low voltage dc motor.
In still another aspect, the present invention provides a household appliance having the above low voltage dc motor.
In the embodiment of the invention, because the ferrite magnet with higher grade is used, the thickness of the magnet can be reduced on the premise of ensuring enough magnetic performance, so that the size of the rotor magnetic core can be increased, and the motor can provide larger space to accommodate more rotor windings, thereby obtaining 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 be reduced by allowing the rotor winding to use thicker wires. In addition, ferrite magnets are less expensive than rare earth magnets, and therefore the cost of the motor is also lower.
Drawings
FIG. 1 illustrates a low voltage DC motor having a preferred embodiment according to the present invention;
fig. 2 shows an axial cross-sectional view of the low voltage dc motor of fig. 1;
fig. 3 shows a rotor core of the low voltage dc motor of fig. 1.
Detailed Description
The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings. It is to be understood that the drawings are provided solely for the purposes of reference and illustration and are not intended as a definition of the limits of the invention. The dimensions shown in the figures are for clarity of description only and are not to be taken as limiting the scale.
Fig. 1 shows a low voltage dc motor 16 having a stator and a rotor rotatable relative to the stator in accordance with a preferred embodiment of the present invention. The rotor includes a rotation shaft 22, a rotor core 24 fixed to the rotation shaft 22, a commutator 26 fixed to the rotation shaft 22 and adjacent to the rotor core 24, and a rotor winding 28 wound around each pole portion 30 of the rotor core 24 and electrically connected to the commutator 26. The rotor core 24 may be formed by stacking a plurality of rotor core pieces in the axial direction of the rotation shaft. Slots are formed between adjacent rotor pole sections to accommodate rotor windings. A fan 32 is secured to the rotor core 24 and cooperates with an opening 34 in a housing 36 to cool the motor with an air flow during rotation. Preferably, rotor core 24 has 5 pole portions and commutator 26 has 5 segments. In another embodiment, rotor core 24 may have 10 pole portions.
The stator includes an axially extending cylindrical housing 36 having an open end and a closed end 38, two pieces of permanent magnets 40 secured to the inner surface of the housing 36, an end cap 42 closing the open end of the housing 36, and a pair of brush assemblies. The two permanent magnets 40 form two permanent magnet poles. The housing 36 is made of a magnetically permeable material. A flux ring 44 is secured to the outer surface of the housing 36 to reduce the reluctance of the flux return line of the housing 36. End cap 42 is fixedly mounted to housing 36. The shaft 22 is rotatably supported by two bearings 46 at the end cap 42 and the closed end 38 of the housing, respectively. The rotor core is disposed opposite to the magnet 40 with an air gap therebetween.
The end cap 42 has a base plate 48, an annular sidewall 50 extending axially inwardly from the base plate 48, and a bearing seat 52 extending axially outwardly from the base plate 48 for supporting a bearing 46. The side walls 50 and the base plate 48 together form a chamber that can accommodate the commutator 16. Each brush assembly has a brush holder 54, the brush holder 54 extending radially inwardly from the side wall 50 and communicating with the chamber. A brush 56 is slidably mounted in the brush holder 54 and is in sliding contact with the commutator 26 under resilient support of a resilient member (not shown). The end cap 42 is also provided with two electrical terminals 58 for electrically connecting to an external power source. Each electrical terminal 58 is electrically connected to a respective brush 56 via an electrical conductor (e.g., a shunt, not shown). In this way, a low voltage dc voltage may be provided to the rotor windings 28 via the electrical terminals 58, the brushes 56, and the commutator 26. The low-voltage dc voltage may be 7V to 36V, preferably 12V to 20V, and more preferably 16V to 17V.
In the embodiment of the present invention, the permanent magnet 40 is a high-grade ferrite magnet, preferably having a maximum energy product value BHmax of 35.8 + -1.6 kj/m3A residual magnetic induction Br of 430 + -10 mT, a coercive force Hcb of 318.5 + -7.9 kA/m and an intrinsic coercive force Hcj of 358.3 + -7.9 kA/m, and in another preferred embodiment, the permanent magnet 40 is made of a material having a maximum magnetic energy product BHmax of 34.2 + -1.6 kj/m3The residual magnetic induction strength Br is 430 +/-10 mT, the coercive force Hcb is 258.7 +/-7.9 kA/m, and the intrinsic coercive force Hcj is 270.7 +/-7.9 kA/m. The ratio of the outer diameter of the rotor magnetic core to the outer diameter of the motor casing is 67-75%.
In this embodiment, the diameter of the conducting wire of the rotor winding is in the range of 0.1mm to 0.5mm, preferably in the range of 0.3mm to 0.35mm, and more preferably 0.32 mm.
In an example of a 300 series low voltage dc motor according to the above preferred embodiment of the present invention, the outer diameter D2 of the motor housing (excluding the thickness of the flux ring 44) is 27.5mm ± 0.3mm, the outer diameter of the rotor core is 19mm ± 0.2mm, and the ratio of the outer diameter of the rotor core to the outer diameter of the housing is less than 71%.
In the embodiment of the invention, because the ferrite magnet with higher grade is used, the thickness of the magnet can be reduced on the premise of ensuring enough magnetic performance, so that the size of the rotor magnetic core can be increased. Thereby, the motor may provide more space to accommodate more rotor windings, resulting in higher output power. As a few specific examples of the 300 series low-voltage direct current motor, when the input voltage of the motor is 16.2V +/-1.6V, the axial sizes of the magnets are 21.0mm +/-2.1 mm, 27.5mm +/-0.3 mm and 34mm +/-0.3 mm, and the rated output power of the motor can reach 20 watts, 50 watts and 80 watts respectively.
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, ferrite magnets are less expensive than rare earth magnets, and therefore the cost of the motor is also lower.
The low voltage dc motor according to the above embodiment of the present invention is particularly suitable for use in household appliances such as a roll brush for driving a hand-held cleaner.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention, such as a stator having four or more permanent magnets, are also included in the scope of the present invention.

Claims (9)

1. A low-voltage direct current motor for a rolling brush of a dust collector comprises a stator and a rotor rotating relative to the stator, wherein the rotor comprises a rotating shaft, a rotor magnetic core fixed on the rotating shaft, a commutator fixed on the rotating shaft and adjacent to the rotor magnetic core, and a rotor winding wound on the pole part of the rotor magnetic core and electrically connected with the commutator, the stator comprises a barrel-shaped shell, a permanent magnet arranged on the inner surface of the shell, and an electric brush in sliding contact with the commutator, the input voltage of the motor is within the range of 7-36V, the ratio of the outer diameter of the rotor magnetic core to the outer diameter of the shell is 67% -75%, the permanent magnet is a ferrite magnet, the outer diameter of the shell is 27.5mm +/-0.3 mm, the outer diameter of the rotor magnetic core is 19mm +/-0.2 mm, and the axial length of the magnet is 21.0mm +/-2.1 mm, 27.5mm +/-0.3 mm or 34mm +/-0.3 mm when the input voltage of the motor is 16.2V +/-1.6V, the rated output power of the motor can reach 20 watts and 50 watts respectivelyOr 80 watts, the maximum magnetic energy product value BHmax of the ferrite magnet is 35.8 +/-1.6 kj/m3Or 34.2 +/-1.6 kj/m3Is made of the material of (1).
2. The low voltage dc motor of claim 1, wherein a ratio of an outer diameter of the rotor core to an outer diameter of the housing is 67.6% to 73.8%.
3. The low-voltage direct-current motor according to claim 1, wherein the ferrite magnet is made of a material having a residual magnetic induction Br of 430 ± 10mT, a coercive force Hcb of 318.5 ± 7.9kA/m, and an intrinsic coercive force Hcj of 358.3 ± 7.9kA/m when a maximum magnetic energy product BHmax of the ferrite magnet is 35.8 ± 1.6kj/m 3.
4. The low-voltage direct-current motor according to claim 1, wherein the ferrite magnet is made of a material having a residual magnetic induction Br of 430 ± 10mT, a coercive force Hcb of 258.7 ± 7.9kA/m, and an intrinsic coercive force Hcj of 270.7 ± 7.9kA/m, when the maximum magnetic energy product BHmax of the ferrite magnet is 34.2 ± 1.6kj/m 3.
5. The low voltage dc motor of claim 1, wherein the rotor core has 5 or 10 pole segments, the stator has 2 permanent magnet poles, and the commutator has 5 segments.
6. The low voltage dc motor according to claim 1, wherein a wire diameter of a rotor winding of the low voltage dc motor is in a range of 0.1mm to 0.5 mm.
7. The low voltage dc motor according to claim 1, wherein a wire diameter of a rotor winding of the low voltage dc motor is in a range of 0.3mm to 0.35 mm.
8. A vacuum cleaner roller brush driven by a low voltage DC motor as claimed in any one of claims 1 to 7.
9. A household appliance having a low voltage DC motor as claimed in any one of claims 1 to 7.
CN201610244005.8A 2015-06-19 2016-04-19 Low-voltage direct-current motor, dust collector rolling brush and household appliance Active CN106257805B (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE102016111076.0A DE102016111076A1 (en) 2015-06-19 2016-06-16 Low-voltage DC motor
US15/185,492 US10218230B2 (en) 2015-06-19 2016-06-17 Low-voltage direct current motor
US16/231,075 US20190222075A1 (en) 2015-06-19 2018-12-21 Low-voltage direct current motor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201510345658 2015-06-19
CN2015103456580 2015-06-19

Publications (2)

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CN106257805A CN106257805A (en) 2016-12-28
CN106257805B true CN106257805B (en) 2021-07-30

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4445059A (en) * 1981-02-03 1984-04-24 Robert Bosch Gmbh Electric motor, in particular a small motor
CN1269623A (en) * 1999-04-07 2000-10-11 马渊马达株式会社 Minisize motor and mfg. method thereof
CN201975875U (en) * 2011-01-27 2011-09-14 德昌电机(深圳)有限公司 Electric tool and magnetoelectric machine thereof
CN102412689A (en) * 2010-09-17 2012-04-11 马渊马达株式会社 Dc motor
CN102801270A (en) * 2011-05-26 2012-11-28 德昌电机(深圳)有限公司 Permanent magnet motor and kitchen appliance with same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4445059A (en) * 1981-02-03 1984-04-24 Robert Bosch Gmbh Electric motor, in particular a small motor
CN1269623A (en) * 1999-04-07 2000-10-11 马渊马达株式会社 Minisize motor and mfg. method thereof
CN102412689A (en) * 2010-09-17 2012-04-11 马渊马达株式会社 Dc motor
CN201975875U (en) * 2011-01-27 2011-09-14 德昌电机(深圳)有限公司 Electric tool and magnetoelectric machine thereof
CN102801270A (en) * 2011-05-26 2012-11-28 德昌电机(深圳)有限公司 Permanent magnet motor and kitchen appliance with same

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