CN109217576B - Permanent magnet direct current motor and food processor - Google Patents
Permanent magnet direct current motor and food processor Download PDFInfo
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- CN109217576B CN109217576B CN201710552285.3A CN201710552285A CN109217576B CN 109217576 B CN109217576 B CN 109217576B CN 201710552285 A CN201710552285 A CN 201710552285A CN 109217576 B CN109217576 B CN 109217576B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K13/00—Structural associations of current collectors with motors or generators, e.g. brush mounting plates or connections to windings; Disposition of current collectors in motors or generators; Arrangements for improving commutation
- H02K13/006—Structural associations of commutators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K13/00—Structural associations of current collectors with motors or generators, e.g. brush mounting plates or connections to windings; Disposition of current collectors in motors or generators; Arrangements for improving commutation
- H02K13/10—Arrangements of brushes or commutators specially adapted for improving commutation
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- 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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- Motor Or Generator Current Collectors (AREA)
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Abstract
The invention provides a permanent magnet direct current motor for a food processor, comprising: the rotor assembly comprises a rotating shaft and a commutator, the commutator is sleeved on the rotating shaft, and the commutator comprises at least four commutator segments; the carbon brushes are strip-shaped and comprise a first carbon brush and a second carbon brush which are symmetrically distributed on two sides of the commutator, a first end face of one carbon brush is connected with the power supply, and a second end face of one carbon brush is abutted against at least one commutator segment; the maximum dimension of the second end surface along the length direction of the rotating shaft is the thickness a, the maximum dimension of the second end surface along the direction vertical to the thickness is the width b, and the ratio a/b of the thickness a to the width b of the carbon brush is larger than or equal to 1.7. According to the permanent magnet direct current motor provided by the invention, the ratio of the thickness a to the width b of the carbon brush is larger than or equal to 1.7, so that the carbon brush has larger thickness and smaller width under the condition of the same sectional area, the generation of an invalid winding is effectively reduced, and the motor efficiency is improved.
Description
Technical Field
The invention relates to the field of household appliances, in particular to a permanent magnet direct current motor and a food processor.
Background
In the motor in the related art, after the hook-type commutator is bent, the effective length of a commutator segment is shortened, and in order to ensure that the sectional area of the carbon brush meets the requirement that the current density of the motor cannot be too small, the thickness of the carbon brush needs to be shortened and the width of the carbon brush needs to be increased, so that the ratio of the thickness to the width of the carbon brush is smaller than 1.7; the larger the width of the carbon brush is, the more the number of the contact pieces of the single carbon brush and the commutator is, and the current situation is that the carbon brush completely contacts 2 to 3 commutator pieces or more. The more the number of the carbon brushes and the contact pieces of the commutator is, the more the windings causing short circuit invalidation are, the short-circuited windings are the effective windings of the motor at the moment, namely the effective edges of the windings are stressed and become invalid windings after being short-circuited, so that the torque of the direct current motor at the moment is reduced, the armature current is correspondingly increased, and the motor is damaged due to the increase of the current in other windings.
The existing solution is to increase the outer diameter of the commutator to widen the width of each commutator segment, but the outer diameter of the commutator is increased, thereby increasing the risk of high-speed operation of the motor and reducing the reliability of the motor.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, an object of the present invention is to provide a permanent magnet dc motor.
Another object of the present invention is to provide a food processor.
In view of the above, according to an object of the present invention, there is provided a permanent magnet dc motor for a food processor, comprising: the rotor assembly comprises a rotating shaft and a commutator, the commutator is sleeved on the rotating shaft, and the commutator comprises at least four commutator segments; the carbon brushes are strip-shaped and comprise a first carbon brush and a second carbon brush which are symmetrically distributed on two sides of the commutator, a first end face of one carbon brush is connected with the power supply, and a second end face of one carbon brush is abutted against at least one commutator segment; the maximum dimension of the second end surface along the length direction of the rotating shaft is the thickness a, the maximum dimension of the second end surface along the direction vertical to the thickness is the width b, and the ratio a/b of the thickness a to the width b of the carbon brush is larger than or equal to 1.7.
According to the permanent magnet direct current motor provided by the invention, the first carbon brush and the second carbon brush are symmetrically distributed on two sides of the commutator, so that the motor finishes the commutation action. By improving the thickness of the carbon brush, the ratio of the thickness a to the width b of the carbon brush is larger than or equal to 1.7, the carbon brush can be enabled to be larger in thickness and smaller in width under the condition of the same sectional area, one carbon brush is collided with four commutator segments at most simultaneously after corresponding adjustment is carried out on different commutators, at the moment, only two commutator segments in the four commutator segments are short-circuited and invalid, the number of the contact segments of the carbon brush and the commutators is effectively reduced, windings in a rotor assembly are fully utilized, the generation of invalid windings is effectively reduced, the loss of current caused by the invalid windings is reduced, the service life reliability of a motor is improved, and the motor efficiency is improved.
In addition, according to the permanent magnet direct current motor in the above technical solution provided by the present invention, the following additional technical features may also be provided:
in the above technical solution, preferably, a value range of a ratio a/b of the thickness a to the width b of the carbon brush is 1.7 or more and 2.5 or less.
In this embodiment, an upper limit of a ratio of the thickness a to the width b of the carbon brush is given. Because the thickness a of the carbon brush is limited by the height of the commutator, the height of the commutator needs to be increased if the thickness a of the carbon brush is further increased, when the commutator is too high, the overall longitudinal dimension of the motor is increased, space waste is caused, and the production cost is increased. By giving the upper limit value, the size of the commutator can be kept in a more optimized range, the requirement of reducing the width of the carbon brush can be met, the space of the motor is fully utilized, and the cost is controlled.
In any of the above technical solutions, preferably, the commutator is a slot commutator.
In the technical scheme, the commutator adopts the groove type commutator, on one hand, the groove type commutator occupies smaller longitudinal dimension for arranging the wire embedding groove, the space for arranging the carbon brush is correspondingly increased, the thickness of the carbon brush is increased, and the requirement that a/b is more than or equal to 1.7 can be met. On the other hand, different from the hook type commutator, the winding is exposed outside, the winding is embedded into the wire embedding grooves of the commutator segments by the groove type commutator, the windings corresponding to two adjacent commutator segments can be isolated from each other, the condition of contact short circuit of the adjacent windings can not occur even if the wire diameter is properly increased, and therefore the power of the permanent magnet direct current motor is increased, the permanent magnet direct current motor can meet the performance requirements of output large torque and high rotating speed simultaneously when in work, the diameter of the commutator does not need to be excessively increased, and the safety requirement under the high rotating speed is met.
In any of the above technical solutions, preferably, the commutator further includes at least one insulating portion, and one insulating portion is located between two commutator segments; the width c of the insulating part, the width d of the commutator segment and the width b of the carbon brush meet the condition that d is not less than b and not more than 2d + c.
In the technical scheme, at least one insulating part of the commutator is positioned between two commutator segments, so that short circuit caused by mutual connection and conduction when the distance between the commutator segments is too short can be effectively prevented, normal work of the permanent magnet direct current motor is ensured, fire is prevented from being caused, and the use safety of the permanent magnet direct current motor is improved. The width c of the insulating part, the width d of the commutator segments and the width b of the carbon brush meet the condition that d is not less than b and not more than 2d + c, the upper limit value ensures that one carbon brush is completely contacted with two commutator segments at most simultaneously, and the number of invalid windings is reduced; the lower limit value prevents the carbon brush from being contacted with one commutator segment for a relatively long time, thereby improving the commutation speed and ensuring the efficiency of the motor.
In any of the above aspects, the width c of the insulating portion is preferably greater than or equal to 0.5 mm.
In the technical scheme, the width of the limited insulating part is larger than or equal to 0.5mm, the electrical distance of larger than or equal to 0.5mm between the adjacent commutator segments can be ensured, the contact short circuit between the adjacent commutator segments can be effectively avoided, and the reliability of the motor is improved.
In any of the above technical solutions, preferably, the diameter of the commutator ranges from 28mm to 45mm, and the number of the commutator segments is 48.
In the technical scheme, after the carbon brush is narrowed, the number of the commutator can be increased correspondingly under the condition that an invalid winding is not increased; in addition, the groove type commutator is adopted, the distance between two adjacent commutator segments can be reduced, the number of the commutator segments can be further increased under the condition that the diameter of the commutator meets the safety requirement, the commutator can realize 48 commutator segments under the safety size of 28mm to 45mm in diameter, the voltage drop between the commutator segments is reduced, the discharge voltage difference between the conductive part and the commutator is reduced, the discharge current is reduced, electric sparks generated during the operation of the permanent magnet direct current motor are reduced, the commutation deterioration of the permanent magnet direct current motor is avoided, and the use safety of the permanent magnet direct current motor is improved.
In any one of the above technical solutions, preferably, the width b of the carbon brush ranges from 2.5mm to 6 mm.
In the technical scheme, the value range of the width b of the carbon brush is limited. The upper limit value ensures that one carbon brush is completely contacted with two commutator segments at most at the same time, and is beneficial to reducing the number of invalid windings; the lower limit value prevents the carbon brush from being contacted with one commutator segment for a relatively long time, thereby improving the commutation speed and ensuring the efficiency of the motor.
In any one of the above technical solutions, preferably, a ratio of the resistivity of the first carbon brush to the resistivity of the second carbon brush is less than or equal to 0.9, wherein a commutation spark of the second carbon brush is stronger than a commutation spark of the first carbon brush.
In the technical scheme, one of the first carbon brush and the second carbon brush is connected with the positive pole of the motor, and the other one of the first carbon brush and the second carbon brush is connected with the negative pole of the motor. When the commutation spark of the second carbon brush is stronger, the resistivity ratio of the first carbon brush and the second carbon brush is reduced, namely the resistivity of the second carbon brush is improved and/or the resistivity of the first carbon brush is reduced, which is beneficial to reducing the commutation current of the second carbon brush, thereby reducing the discharge spark of each commutation, reducing the electrical wear of the commutator and the second carbon brush, enabling the wear rate of the second carbon brush to be equivalent to that of the first carbon brush, and effectively prolonging the service life of the motor.
In conclusion, the invention provides a direct current permanent magnet motor, which is matched with the structure of a groove type commutator, so that the thickness of the carbon brush is larger and the width of the carbon brush is smaller under the condition of the same intercept product, the number of commutator pieces corresponding to the carbon brush is increased, and electric sparks generated during the operation of the permanent magnet direct current motor are reduced.
According to another object of the present invention, there is provided a food processor comprising: the permanent magnet direct current motor according to any one of the above technical solutions.
The food processor provided by the invention comprises the permanent magnet direct current motor in any technical scheme, so that the food processor has all the beneficial effects of the permanent magnet direct current motor, and is not repeated herein.
In any of the above technical solutions, preferably, the food processor is at least one of: broken wall machine, mixer, cooking machine, soybean milk machine and juice extractor.
In the technical scheme, the food processor is at least one of the following: broken wall machine, mixer, cooking machine, soybean milk machine and juice extractor, wherein, broken wall machine especially needs the motor to have great power, just can break the cell wall of food, makes food become extremely fine and smooth, therefore the cross-sectional area of carbon brush often is great, and the power of motor once increases, will produce great spark, causes the potential safety hazard. The permanent magnet direct current motor provided by the invention is applied to a wall breaking machine, and by improving the ratio of the thickness a to the width b of the carbon brush and increasing the number of commutator segments, the winding in a rotor assembly can be fully utilized, the generation of an invalid winding is effectively reduced, the loss of current caused by the invalid winding is reduced, the permanent magnet direct current motor can be ensured not to generate larger sparks under higher power, and the use safety is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a front view illustrating an assembly of a rotor assembly and a carbon brush according to an embodiment of the present invention;
FIG. 2 is a top view of a rotor assembly and carbon brushes assembled according to one embodiment of the present invention;
FIG. 3 illustrates a top view of a commutator provided by one embodiment of the present invention;
FIG. 4 illustrates a rotor assembly winding diagram provided by one embodiment of the present invention;
FIG. 5 illustrates a schematic diagram of a rotor assembly winding provided by one embodiment of the present invention.
Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 5 is:
10 rotor assembly, 12 rotating shaft, 14 commutator, 142 commutator segment, 144 insulation, 16 winding, 20 carbon brush, 22 first carbon brush, 24 second carbon brush and 30 spring.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A permanent magnet dc motor according to some embodiments of the present invention is described below with reference to fig. 1 to 5.
As shown in fig. 1 and 2, an embodiment of a first aspect of the present invention provides a permanent magnet dc motor for a food processor, including: the rotor assembly 10 comprises a rotating shaft 12 and a commutator 14, wherein the commutator 14 is sleeved on the rotating shaft 12, and the commutator 14 comprises at least four commutator segments 142; the carbon brushes 20 are strip-shaped and comprise a first carbon brush 22 and a second carbon brush 24 which are symmetrically distributed on two sides of the commutator 14, a first end face of one carbon brush 20 is connected with a power supply, and a second end face of one carbon brush 20 is abutted against at least one commutator segment 142; the maximum dimension of the second end surface along the length direction of the rotating shaft 12 is the thickness a, the maximum dimension of the second end surface along the direction perpendicular to the thickness is the width b, and the ratio a/b of the thickness a to the width b of the carbon brush 20 is greater than or equal to 1.7.
According to the permanent magnet direct current motor provided by the invention, the first carbon brush 22 and the second carbon brush 24 are symmetrically distributed on two sides of the commutator 14, so that the motor finishes the commutation action. By improving the thickness of the carbon brush 20, the ratio of the thickness a to the width b of the carbon brush 20 is greater than or equal to 1.7, so that the thickness of the carbon brush 20 is larger and the width of the carbon brush 20 is smaller under the condition of the same sectional area of the carbon brush 20, after corresponding adjustment is performed on different commutators 14, one carbon brush 20 is simultaneously abutted to four commutators 142 at most, at this time, only two commutators 142 in the four commutators 142 are short-circuited and invalid, the number of contact pieces between the carbon brush 20 and the commutators 14 is effectively reduced, so that windings 16 in the rotor assembly 10 are fully utilized, the generation of invalid windings is effectively reduced, the loss of current caused by the invalid windings is reduced, the service life reliability of the motor is improved, and the efficiency of the motor is improved. Preferably, the carbon brush 20 has a square bar shape, that is, the first end surface and the second end surface thereof have a square shape.
In one embodiment of the present invention, it is preferable that a ratio a/b of the thickness a to the width b of the carbon brush 20 is in a range of 1.7 a/b 2.5.
In this embodiment, an upper limit of the ratio of the thickness a to the width b of the carbon brush 20 is given. Since the thickness a of the carbon brush 20 is limited by the height dimension of the commutator 14, further increasing the thickness a of the carbon brush 20 requires increasing the height of the commutator 14, and when the commutator 14 is too high, the longitudinal dimension of the entire motor is increased, which causes a waste of space and increases the production cost. By setting the upper limit value, the size of the commutator 14 can be kept within a more optimized range, which not only satisfies the requirement of reducing the width of the carbon brush 20, but also makes full use of the space of the motor, which contributes to cost control.
In one embodiment of the present invention, the commutator 14 is preferably a slot commutator.
In this embodiment, the commutator 14 is a slot commutator, on one hand, the slot commutator occupies a smaller longitudinal dimension for forming the wire embedding slot, and the space for arranging the carbon brush 20 is correspondingly increased, which is helpful for increasing the thickness of the carbon brush 20, and can further satisfy the requirement that a/b is greater than or equal to 1.7. For example, for a groove type commutator and a hook type commutator having the same height of 10mm, the wire insertion groove of the former occupies only 2mm in the height direction, and the hook of the latter occupies 3mm to 4mm, and there is often insufficient space to sufficiently increase the thickness of the carbon brush 20. On the other hand, unlike the hook commutator in which the winding 16 is exposed, the slot commutator embeds the winding 16 in the winding inserting grooves of the commutator segments 142, the windings 16 corresponding to two adjacent commutator segments 142 can be isolated from each other, and the condition of short circuit caused by contact of the adjacent windings 16 can not occur even if the wire diameter is properly increased, so that the power of the permanent magnet direct current motor is increased, the permanent magnet direct current motor can simultaneously meet the performance requirements of output large torque and high rotation speed when in work, the diameter of the commutator 14 does not need to be excessively increased, and the safety requirement under high rotation speed is met.
As shown in fig. 2 and 3, in one embodiment of the present invention, the commutator 14 preferably further includes at least one insulating portion 144, one insulating portion 144 being located between two segments 142; the width c of the insulating part 144, the width d of the segment 142 and the width b of the carbon brush 20 satisfy d ≦ b ≦ 2d + c.
In this embodiment, at least one insulating portion 144 of the commutator 14 is located between two segments 142, which can effectively prevent short circuit caused by connection and conduction when the segments 142 are too close to each other, thereby ensuring normal operation of the permanent magnet dc motor, avoiding fire hazard, and improving safety of the permanent magnet dc motor. The width c of the insulating part 144, the width d of the commutator segments 142 and the width b of the carbon brush 20 satisfy d is not less than b and not more than 2d + c, the upper limit value ensures that one carbon brush 20 is completely contacted with two commutator segments 142 at most simultaneously, and the number of invalid windings is reduced; the lower limit value prevents the carbon brush 20 from contacting only one segment 142 for a relatively long time, thereby increasing the commutation speed and ensuring the motor efficiency.
In one embodiment of the present invention, the width c of the insulation 144 is preferably greater than or equal to 0.5 mm.
In this embodiment, the width of the limited insulating part 144 is greater than or equal to 0.5mm, so that the electrical distance between adjacent commutator segments 142 is greater than or equal to 0.5mm, contact short circuit between adjacent commutator segments 142 can be effectively avoided, and the reliability of the motor is improved.
In one embodiment of the present invention, the diameter of the commutator 14 preferably ranges from 28mm to 45mm, and the number of segments 142 is 48.
In this embodiment, after the carbon brush 20 is narrowed, the number of segments of the commutator 14 can be increased accordingly without increasing the dead winding; in addition, the groove type commutator is adopted, the distance between two adjacent commutator segments 142 can be reduced, the number of segments of the commutator 14 can be further increased under the condition that the diameter of the commutator 14 meets the safety requirement, the commutator 14 can realize 48 commutator segments 142 under the safety size of 28mm to 45mm in diameter, the voltage drop between the commutator segments 142 is reduced, the discharge voltage difference between the conductive part and the commutator 14 is reduced, the discharge current is reduced along with the reduction of the discharge voltage difference, electric sparks generated when the permanent magnet direct current motor runs are reduced, the commutation deterioration of the permanent magnet direct current motor is avoided, and the use safety of the permanent magnet direct current motor is improved. Specifically, as shown in fig. 1, the first carbon brush 22 and the second carbon brush 24 are in effective contact with the commutator 14 by the pressing force of the spring 30, as shown in fig. 3, the commutator segments 142 of 48 pieces are respectively numbered 142.1, 142.2, … …, 142.47 and 142.48, and as shown in fig. 4, the windings 16 connected to the commutator segments 142 are respectively numbered 16.1, 16.2, … … 16.47.47 and 16.48. As shown in fig. 5, the arrows indicate the current direction, and it is assumed that current flows from the first carbon brush 22 to the two adjacent segments 142.1 and 142.2 in contact with the first carbon brush, then flows through the two sets of windings 16.1 and 16.2 connected to the two segments 142, passes through the windings 16.3, 16.4, 16.5, 16.6, 16.7, 16.8, … …, 16.41, 16.42, 16.43, 16.44, 16.45 and 16.46 connected in series, flows onto the two sets of adjacent segments 142.47 and 142.48 on the opposite side, and then flows out to the second carbon brush 24. The windings 16.3, 16.4, … … 16.45.45, 16.46 through which the current flows generate a torque under the influence of the magnetic field, so that the rotor assembly 10 rotates, while the windings 16.1, 16.2, 16.47, 16.48 are short-circuited by the first carbon brush 22 and the second carbon brush 24, so that they form a null winding. The more windings 16 that are shorted together by the first carbon brush 22 and the second carbon brush 24, the more reactive windings are formed and the less efficient the motor will be.
In one embodiment of the present invention, it is preferable that the width b of the carbon brush 20 ranges from 2.5mm to 6 mm.
In this embodiment, the range of the width b of the carbon brush 20 is limited. This upper limit value ensures that at most one carbon brush 20 is in full contact with two segments 142 at the same time, which helps to reduce the number of inactive windings; the lower limit value prevents the carbon brush 20 from contacting only one segment 142 for a relatively long time, thereby increasing the commutation speed and ensuring the motor efficiency.
In one embodiment of the present invention, it is preferable that a ratio of the resistivity of the first carbon brush 22 to the resistivity of the second carbon brush 24 is less than or equal to 0.9, wherein the commutation spark of the second carbon brush 24 is stronger than the commutation spark of the first carbon brush 22.
In this embodiment, one of the first carbon brush 22 and the second carbon brush 24 is connected to the positive pole of the motor, and the other is connected to the negative pole of the motor, and because the voltage drop difference between the positive pole and the negative pole of the permanent magnet dc motor is large, the commutation sparks and the wear rate of the positive pole and the negative pole are also large. When the commutation spark of the second carbon brush 24 is strong, the resistivity ratio of the first carbon brush 22 to the second carbon brush 24 is reduced, that is, the resistivity of the second carbon brush 24 is improved and/or the resistivity of the first carbon brush 22 is reduced, which is helpful for reducing the commutation current of the second carbon brush 24, thereby reducing the discharge spark of each commutation, reducing the electrical wear of the commutator 14 and the second carbon brush 24, making the wear rate of the second carbon brush 24 equal to that of the first carbon brush 22, and effectively prolonging the service life of the motor.
In summary, the present invention provides a dc permanent magnet machine, which, in cooperation with the structure of the slot type commutator, can make the thickness of the carbon brush 20 larger and the width of the carbon brush 20 smaller under the condition of the same cross-sectional area of the carbon brush 20, so as to increase the number of the commutator 14 corresponding to the carbon brush 20, thereby reducing the electric sparks generated during the operation of the permanent magnet dc motor.
An embodiment of a second aspect of the invention proposes a food processor comprising: a permanent magnet dc machine as claimed in any preceding embodiment.
The food processor provided by the invention comprises the permanent magnet direct current motor in any embodiment, so that the food processor has all the beneficial effects of the permanent magnet direct current motor, and the details are not repeated.
In one embodiment of the present invention, preferably, the food processor is at least one of: broken wall machine, mixer, cooking machine, soybean milk machine and juice extractor.
In this embodiment, the food processor is at least one of: broken wall machine, mixer, cooking machine, soybean milk machine and juice extractor, wherein, especially broken wall machine needs the motor to have great power, just can break the cell wall of food, makes food become extremely fine and smooth, therefore the cross-sectional area of carbon brush 20 often is great, and the power of motor once increases, will produce great spark, causes the potential safety hazard. The permanent magnet direct current motor provided by the invention is applied to a wall breaking machine, and by improving the ratio of the thickness a to the width b of the carbon brush 20 and increasing the number of the commutator 14, the winding 16 in the rotor assembly 10 can be fully utilized, the generation of an invalid winding is effectively reduced, the loss of current caused by the invalid winding is reduced, the permanent magnet direct current motor can be ensured not to generate larger sparks under higher power, and the use safety is improved.
In the present invention, the term "plurality" means two or more unless explicitly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A permanent magnet dc motor for a food processor, comprising:
the rotor assembly comprises a rotating shaft and a commutator, the commutator is sleeved on the rotating shaft, and the commutator comprises at least four commutator segments; and
the carbon brushes are strip-shaped and comprise a first carbon brush and a second carbon brush which are symmetrically distributed on two sides of the commutator, a first end face of one carbon brush is connected with a power supply, and a second end face of one carbon brush is abutted against at least one commutator segment;
the maximum dimension of the second end face in the length direction of the rotating shaft is the thickness a of the second end face, the maximum dimension of the second end face in the direction perpendicular to the thickness is the width b of the second end face, and the ratio a/b of the thickness a to the width b of the carbon brush is larger than or equal to 1.7;
the commutator also comprises at least one insulating part, and one insulating part is positioned between the two commutator segments.
2. The permanent magnet direct current motor according to claim 1,
the value range of the ratio a/b of the thickness a to the width b of the carbon brush is more than or equal to 1.7 and less than or equal to 2.5.
3. The permanent magnet direct current motor according to claim 1,
the commutator is a groove type commutator.
4. The permanent magnet direct current motor according to claim 3,
the width c of the insulating part, the width d of the commutator segment and the width b of the carbon brush meet the condition that d is not less than b and not more than 2d + c.
5. The permanent magnet direct current motor according to claim 4,
the width c of the insulating part is greater than or equal to 0.5 mm.
6. The permanent magnet direct current motor according to any one of claims 3 to 5,
the diameter of the commutator ranges from 28mm to 45mm, and the number of the commutator segments is 48.
7. The permanent magnet direct current motor according to claim 6,
the value range of the width b of the carbon brush is 2.5mm to 6 mm.
8. The permanent magnet direct current motor according to any one of claims 1 to 5,
the ratio of the resistivity of the first carbon brush to the resistivity of the second carbon brush is less than or equal to 0.9, wherein the commutation spark of the second carbon brush is stronger than the commutation spark of the first carbon brush.
9. A food processor, comprising:
a permanent magnet direct current machine according to any one of claims 1 to 8.
10. The food processor of claim 9, wherein the food processor is at least one of: broken wall machine, mixer, cooking machine, soybean milk machine and juice extractor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710552285.3A CN109217576B (en) | 2017-07-07 | 2017-07-07 | Permanent magnet direct current motor and food processor |
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| CN201710552285.3A CN109217576B (en) | 2017-07-07 | 2017-07-07 | Permanent magnet direct current motor and food processor |
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| CN109217576B true CN109217576B (en) | 2020-09-04 |
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| US6891304B1 (en) * | 2000-09-06 | 2005-05-10 | Quebec Metal Powders Limited | Brush DC motors and AC commutator motor structures with concentrated windings |
| JP4889560B2 (en) * | 2007-05-07 | 2012-03-07 | 三菱電機株式会社 | Brush, rotating electric machine, blower and vacuum cleaner |
| CN203521850U (en) * | 2013-10-25 | 2014-04-02 | 温岭市达昌电器厂 | Commutator |
| CN205753909U (en) * | 2016-05-12 | 2016-11-30 | 易助电机（苏州）有限公司 | The brush structure of HVDC motor |
| CN206992894U (en) * | 2017-07-07 | 2018-02-09 | 广东美的生活电器制造有限公司 | Permanent magnet DC motor and food processor |
-
2017
- 2017-07-07 CN CN201710552285.3A patent/CN109217576B/en active Active
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| Publication number | Publication date |
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| CN109217576A (en) | 2019-01-15 |
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