CN216959520U - Low-risk motor and food processor - Google Patents

Abstract

The utility model relates to the technical field of food processing devices, and discloses a low-risk motor and a food processing machine, wherein the low-risk motor comprises a stator assembly, a rotor assembly, a support assembly and a carbon brush assembly, the rotor assembly comprises a commutator, the support assembly comprises a support body and a carbon brush box, the support body is provided with a support hole for mounting the carbon brush box, the carbon brush assembly comprises a carbon brush body and a spring, and the carbon brush body is in floating butt joint with the commutator through the spring; the end face, abutted against the commutator, of the carbon brush body is an arc-shaped end face, the arc-shaped end face comprises a first arc face and a second arc face, and the first arc face, the second arc face and the commutator respectively have different attaching areas; the food processor employs the low risk motor described above. Therefore, the effective contact area between the carbon brush body and the surface of the commutator is increased, the EMI (electro-magnetic interference) inhibiting effect of the motor is enhanced, and the friction between the carbon brush body and the commutator is reduced; meanwhile, the reliability of various functions of the food processor is improved, and the running noise is reduced.

Description

Low-risk motor and food processor

Technical Field

The utility model relates to the technical field of food processing devices, in particular to a low-risk motor and a food processing machine.

Background

Most of food processors on the market at present adopt brush motors with two poles and carbon brushes designed symmetrically, and the following problems may exist in the type selection configuration of the motors: firstly, the carbon brushes of two poles are symmetrically designed, the utilization rate of the effective contact area of the carbon brushes and the commutator is low, the effective pressure of the carbon brushes on the surface of the commutator is large, the friction between the carbon brushes and the commutator is large, the carbon brushes are seriously abraded to influence the service life of the commutator, and the running of the motor is accompanied by larger mechanical noise; secondly, carbon powder is easy to accumulate on the side wall of the outgoing line of the motor and other pressure-resistant weak positions in the using process, so that the pressure resistance of the motor is poor; in addition, due to the existence of commutation sparks, most brushed motors need to select a high-resistivity carbon brush to improve the EMI (electro-magnetic interference) inhibition effect of the motor, and meanwhile, the high-impedance carbon brush has the risk of high-temperature bump jamming.

It will thus be seen that there is a need for further improvements and enhancements in the art.

Disclosure of Invention

To solve one or more of the technical problems of the prior art, or at least to provide a beneficial alternative, the present invention provides a low risk motor and a food processor to prolong the motor lifetime and improve the operating noise.

To achieve the above object, the present invention provides a low risk motor comprising: a stator assembly; the rotor assembly comprises a rotating shaft and a commutator arranged on the rotating shaft; the bracket component comprises a bracket body and a carbon brush box, wherein the bracket body is circumferentially provided with a bracket hole, and the carbon brush box is arranged in the bracket hole; the carbon brush assembly comprises a carbon brush body and a spring, and the carbon brush body is butted against the commutator in a floating manner along the extending direction of the support hole through the spring; the end face of the carbon brush body abutted to the commutator is set to be an arc-shaped end face, the arc-shaped end face comprises a first arc face and a second arc face which are formed by extending the center of the carbon brush body to two sides, and the first arc face and the second arc face and the commutator respectively have different attaching areas.

The end faces of the carbon brush bodies abutted to the commutator are arc-shaped end faces, the first arc faces and the second arc faces are different from the fitting area of the commutator through the arc-shaped structures of the end faces, and therefore asymmetric structures are formed between the carbon brush bodies on two sides and the commutator at least in the contact relation. On one hand, the effective contact area between the carbon brush body and the surface of the commutator can be increased, so that the current density of the carbon brush body is reduced, the EMI (electro-magnetic interference) inhibiting effect of the motor is enhanced, and the service life of the carbon brush body is prolonged; on the other hand, the contact surface of the carbon brush body and the commutator is an inclined arc surface, so that the tangent line of the contact position of the carbon brush body and the commutator is not in the horizontal direction, therefore, under the condition that the spring elasticity is certain, the effective pressure of the carbon brush body acting on the surface of the commutator can be properly reduced, the friction between the carbon brush body and the commutator can be reduced, the abrasion degree of the carbon brush body can be reduced, and the mechanical noise of the motor in operation can be improved.

In a preferred embodiment, at least one pair of carbon brush bodies is offset from the rotational axis of the commutator in the longitudinal direction thereof.

The carbon brush body is biased to the rotating axis of the commutator along the length direction, an asymmetric carbon brush structure is formed in a spatial position, the arc-shaped form of the abutting end face of the carbon brush body and the commutator can be changed on the premise of not changing the structure of the carbon brush body, and compared with a symmetric carbon brush structure, on one hand, the effective contact area of the carbon brush body and the surface of the commutator can be increased, the service life of the carbon brush body is prolonged, and the noise is reduced by reducing the friction between the carbon brush body and the surface of the commutator; on the other hand, the carbon brush body is offset relative to the geometric rotating shaft center of the commutator, so that the commutation angle of the motor can be indirectly adjusted, and commutation sparks can be inhibited to enhance the EMI inhibition effect of the motor; secondly, in the working process of the motor, the randomness of the distribution of the carbon powder can be enhanced, and the phenomenon that the carbon powder is seriously accumulated at the local pressure-resistant weak part of the motor is avoided.

In a preferred implementation mode, the radius of the commutator is R, the eccentric distance between the carbon brush body and the rotating shaft center of the commutator is L, and L is more than 0 and less than 0.6R.

The influence on the reliability of the butting of the carbon brush body and the commutator due to the overlarge eccentric distance between the carbon brush body and the rotating axis of the commutator is avoided by limiting the eccentric distance of the carbon brush body. Utilize reasonable eccentric distance, can improve the effective area of contact on carbon brush body and commutator surface under the prerequisite of guaranteeing carbon brush body and commutator butt relation reliability, and then reduce carbon brush body current density, reinforcing motor restraines the EMI effect, can prolong the life of carbon brush body simultaneously.

In a preferred embodiment, the eccentric direction of the carbon brush body corresponds to the direction of rotation of the commutator.

The eccentric direction of the carbon brush body is consistent with the rotating direction of the commutator, so that the resistance of the carbon brush body to the rotation of the commutator is reduced, the obstruction of the eccentric arrangement of the carbon brush body to the rotation of the commutator is reduced, and the purpose of promoting the rotation of the commutator is achieved.

In a preferred implementation mode, the width of the carbon brush body is B, the effective width of the commutator single pieces is c, the groove width between the commutator single pieces is h, and c +2h < B < 2c +3 h.

Through the injecture to carbon brush body width, guarantee that every switching-over of motor carbon brush body can only effectively short circuit two commutators at most in the twinkling of an eye to in the suppression motor switching-over spark, improve the motor and restrain EMI effect, promote motor startability, and then guarantee that the motor operates steadily reliably.

In a preferred implementation mode, the single-side fit clearance between the side wall of the carbon brush body and the side wall of the carbon brush box is H, and H is more than 0.1mm and less than 0.2 mm.

A unilateral fit clearance is reserved between the side wall of the carbon brush body and the side wall of the carbon brush box, and the size of the electrical measurement fit clearance is reasonably limited, so that the problem that the carbon brush body with too high impedance is blocked due to expansion deformation at high temperature can be avoided on the premise that the installation and fixing effects of the carbon brush body in the carbon brush box are not influenced.

In a preferred implementation mode, the support hole is eccentrically arranged on the periphery of the support body, and the carbon brush body is eccentrically arranged on the rotating shaft center of the commutator along with the carbon brush box.

The support hole is eccentrically arranged on the periphery of the support body, so that the carbon brush body arranged along the extending direction of the support hole can be eccentrically arranged on the rotating shaft center of the commutator to form an arc-shaped end face where the carbon brush body is abutted to the commutator, on one hand, the effective contact area of the carbon brush body and the surface of the commutator can be increased, the service life of the carbon brush body can be prolonged, and the friction between the carbon brush body and the surface of the commutator can be reduced to reduce the noise; on the other hand, an offset structure that the carbon brush body is asymmetrically arranged on two sides of the commutator is constructed in a mode of eccentric support holes, so that the geometric axes of the carbon brush body and the carbon brush box can be maintained in the same direction, and the position stability of the carbon brush body is enhanced.

In a preferred implementation mode, the carbon brush body is eccentrically arranged in the carbon brush box, and the carbon brush box is aligned with the support hole and located at the rotating shaft center of the commutator.

The carbon brush body is eccentrically arranged in the carbon brush box, so that the carbon brush body arranged along the extending direction of the support hole can be eccentrically arranged at the rotating shaft center of the commutator to form an arc-shaped end face of the carbon brush body and the commutator in butt joint, on one hand, the effective contact area of the carbon brush body and the surface of the commutator is increased, on the other hand, the support hole for installing the carbon brush box does not need to be relatively eccentrically arranged, and the processing difficulty of the support body is reduced.

In a preferred implementation manner, the bending and extending direction of the spring and the length direction of the carbon brush body are in the same direction.

The spring bending direction is consistent with the length direction of the carbon brush body, namely the thrust direction of the elastic force to the carbon brush body and the length extending direction of the carbon brush body are in the same direction, so that the pre-compression elastic force of the spring acts on the eccentric two sides of the commutator through the carbon brush body to form static driving torque, and further the rotation of the commutator is promoted.

The utility model provides a food processor, which applies the low-risk motor and is at least one of a wall breaking machine, a stirrer, a juicer, a noodle maker and a soymilk maker.

The low-risk motor is provided with an asymmetric carbon brush structure, so that the end face of the carbon brush body, which is abutted to the commutator, is an arc-shaped end face, the effective contact area between the carbon brush body and the surface of the commutator can be increased, the current density of the carbon brush body is further reduced, the EMI (electro-magnetic interference) inhibiting effect of the motor is enhanced, the stability of the output power of the motor is further improved, a processing cutter arranged on the output shaft of the motor can stably rotate to work, and the reliability of various functions of the food processor is improved; on the other hand, the contact surface of the carbon brush body and the commutator is an inclined arc surface, so that the tangent line of the contact position of the carbon brush body and the commutator is not in the horizontal direction, therefore, under the condition that the spring force is fixed, the effective pressure of the carbon brush body acting on the surface of the commutator can be properly reduced, the friction between the carbon brush body and the commutator can be reduced, the abrasion degree of the carbon brush body can be reduced, and meanwhile, the noise generated when the food processor works is reduced.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model. In the drawings:

fig. 1 is a schematic view of a part of a low risk motor according to an embodiment of the present invention.

Fig. 2 is a schematic view of a part of a motor in an embodiment of the prior art.

Fig. 3 is a partial structural view of a low risk motor according to an embodiment of the present invention.

Fig. 4 is a cross-sectional view of a low risk motor in an embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a bracket body according to an embodiment of the utility model.

Fig. 6 is a schematic structural diagram of a low risk motor according to an embodiment of the present invention.

Fig. 7 is a schematic structural view of a stent body according to another embodiment of the present invention.

Fig. 8 is a schematic structural diagram of a low risk motor according to another embodiment of the present invention.

Wherein:

1-commutator, 11-rotating axle center;

2-stent body, 21-stent hole, 211-stent hole central line;

3-carbon brush box, 31-carbon brush box central line;

4-a carbon brush body, 41-a first cambered surface, 42-a second cambered surface, and 43-a carbon brush body central line;

5-a spring.

Detailed Description

In order to more clearly explain the overall concept of the present invention, the following detailed description is given by way of example in conjunction with the accompanying drawings.

It should be noted that 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 thus the scope of the present invention is not limited by the specific embodiments disclosed below.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. However, the direct connection means that the two bodies are not connected through a transition structure, but are connected through a connection structure to form a whole. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

The following embodiments are specifically adopted:

as shown in fig. 1 to 8, the present invention provides a low risk motor, including a stator assembly, a rotor assembly, a bracket assembly and a carbon brush assembly, where the rotor assembly includes a rotating shaft and a commutator 1 disposed on the rotating shaft, the motor can change a direction of rotation through the commutator 1, the bracket assembly includes a bracket body 2 and a carbon brush box 3, the bracket body 2 is axially provided with a bracket hole 21, the carbon brush box 3 is installed in the bracket hole 21, and the carbon brush assembly is installed in the carbon brush box 3, specifically, the carbon brush assembly includes a carbon brush body 4 and a spring 5, and the carbon brush body 4 is in floating abutment with the commutator 1 along an extending direction of the bracket hole 21 through the spring 5.

In the motor used in the existing food processor, the carbon brushes are symmetrically arranged on both sides of the commutator, the utilization rate of the effective contact area between the carbon brushes and the commutator is low, high EMI (Electromagnetic Interference) is generated, and the effective pressure of the carbon brushes acting on the surface of the commutator is large, so that the friction between the carbon brushes and the commutator is large, the service life of the carbon brushes is influenced due to serious abrasion of the carbon brushes, and the running of the motor is accompanied by large mechanical noise.

In order to solve the above problems, according to the low-risk motor provided by the present invention, the end surface of the carbon brush body 4 abutting against the commutator 1 is set to be an arc end surface, the arc end surface includes the first arc surface 41 and the second arc surface 42 formed by extending the center of the carbon brush body 4 to both sides, the first arc surface 41 and the second arc surface 42 are different from the commutator 1 in the joint area through the arc structure of the end surface, and thus an asymmetric structure is formed between the carbon brush bodies 4 on both sides and the commutator 1 at least in the joint relation.

By means of different attachment of the carbon brush bodies 4 on the two sides and the commutator 1, on one hand, the effective contact area between the carbon brush bodies 4 and the surface of the commutator 1 can be increased, so that the current density of the carbon brush bodies 4 is reduced, the EMI (electro-magnetic interference) inhibiting effect of the motor is enhanced, and the service life of the carbon brush bodies 4 is prolonged; on the other hand, the contact surface of the carbon brush body 4 and the commutator 1 is an inclined arc surface, so that the tangent line of the contact position of the carbon brush body 4 and the commutator 1 is in a non-horizontal direction, therefore, under the condition that the elastic force of the spring 5 is certain, the effective pressure of the carbon brush body 4 acting on the surface of the commutator 1 can be properly reduced, the friction between the carbon brush body 4 and the commutator 1 can be further reduced, the abrasion degree of the carbon brush body 4 can be reduced, and the mechanical noise of the motor operation can be improved.

In a preferred embodiment of the present invention, at least one pair of carbon brush bodies 4 is offset from the rotational axis 11 of the commutator 1 in the longitudinal direction thereof.

In the embodiment shown in fig. 1, the carbon brush bodies 4 on both sides of the commutator 1 are offset from the rotation axis 11 of the commutator 1 along the length direction thereof, so that the initial end surfaces of the carbon brush bodies 4 matched with the commutator 1 are asymmetric arc end surfaces, and an asymmetric carbon brush structure of the motor is formed in a spatial position.

Fig. 2 shows a scheme of a carbon brush and a commutator in the prior art, that is, the length direction of the carbon brush is coaxial with the rotation axis of the commutator, the arc length of the arc end surface of the carbon brush abutting against the commutator is denoted as L1, and the central angle of the arc end surface of the carbon brush abutting against the commutator in the circumferential direction of the commutator is denoted as a 1; in the embodiment shown in fig. 3, the arc length of the arc-shaped end surface of the carbon brush body 4 abutting against the commutator 1 is denoted as L2, the central angle of the arc-shaped end surface of the carbon brush body 4 abutting against the commutator 1 in the circumferential direction of the commutator 1 is denoted as a2, and since the carbon brush body 4 is offset with respect to the rotation axis 11 of the commutator 1, the arc length of the end surface of the carbon brush body 4 abutting against the commutator 1 can be increased without changing the structure of the carbon brush body 4, i.e., L2 is greater than L1, and a2 is greater than a1, i.e., the effective contact area between the carbon brush body 4 and the surface of the commutator 1 is increased, which is beneficial to prolonging the service life of the carbon brush body 4, and reducing the generation of noise by reducing the friction between the carbon brush body 4 and the surface of the commutator 1.

In addition, the carbon brush body 4 is offset relative to the geometric rotation axis 11 of the commutator 1, so that the commutation angle of the motor can be indirectly adjusted, and commutation sparks can be inhibited to enhance the EMI inhibition effect of the motor; secondly, in the working process of the motor, the randomness of the distribution of the carbon powder can be enhanced, and the phenomenon that the carbon powder is seriously accumulated at the local pressure-resistant weak part of the motor is avoided.

The implementation manner of the carbon brush body 4 offset from the rotation axis 11 of the commutator 1 is not particularly limited, and any one of the following implementation manners may be adopted:

embodiment 1: as shown in fig. 5 and 6, the holder hole 21 is eccentrically provided in the outer periphery of the holder body 2, and the carbon brush body 4 is offset from the rotation axis 11 of the commutator 1 with the carbon brush cartridge 3.

In this embodiment, the carbon brush body center line 43 and the carbon brush box center line 31 are maintained in the same direction, the bracket hole 21 for installing the carbon brush box 3 is eccentrically arranged on the periphery of the bracket body 2, the bracket hole center line 211 is offset relative to the rotation axis 11 of the commutator 1, so that the installation position of the carbon brush box 3 on the bracket body 2 can be offset relative to the rotation axis 11 of the commutator 1, the carbon brush body 4 is offset relative to the rotation axis 11 of the commutator 1 along with the carbon brush box 3 to form an arc-shaped end face where the carbon brush body 4 abuts against the commutator 1, on one hand, the effective contact area between the carbon brush body 4 and the surface of the commutator 1 can be increased, the service life of the carbon brush body 4 can be prolonged, and the friction between the carbon brush body 4 and the surface of the commutator 1 can be reduced to reduce the generation of noise; on the other hand, an offset structure that the carbon brush body 4 is asymmetrically arranged on two sides of the commutator 1 is constructed in a mode that the support holes 21 are eccentric, so that the geometric axes of the carbon brush body 4 and the carbon brush box 3 can be maintained in the same direction, and the position stability of the carbon brush body 4 is enhanced.

Embodiment 2: as shown in fig. 7 and 8, the carbon brush body 4 is eccentrically disposed in the carbon brush box 3, and the carbon brush box 3 is aligned with the holder hole 21 to be located at the rotation axis 11 of the commutator 1.

Different from embodiment 1, in this embodiment, the support hole 21 is no longer offset from the outer periphery of the support body 2, so that the carbon brush box 3 can be aligned with the support hole 21 to be located at the rotation axis 11 of the commutator 1, and the carbon brush body 4 is eccentrically disposed in the carbon brush box 3, thereby achieving the offset of the carbon brush body 4 with respect to the rotation axis 11 of the commutator 1. From the processing technology perspective, the support hole 21 for installing the carbon brush box 3 does not need to be arranged eccentrically relative to the periphery of the support body 2, and the difficulty in processing the support body 2 can be reduced.

As a more preferable embodiment of the present invention, as shown in fig. 1 and 6, the radius of the commutator 1 is R, the eccentric distance between the carbon brush body 4 and the rotation axis 11 of the commutator 1 is L, and 0 < L < 0.6R.

The eccentric distance L between the carbon brush body 4 and the rotating shaft center 11 of the commutator 1 is limited to satisfy the following conditions: l is more than 0 and less than 0.6R, so that the influence on the reliability of the butting of the carbon brush body 4 and the commutator 1 due to the overlarge eccentric distance between the carbon brush body 4 and the rotating shaft center 11 of the commutator 1 is avoided. By means of the reasonable eccentric distance, the effective contact area of the carbon brush body 4 and the surface of the commutator 1 can be increased on the premise that the reliability of the butting relation between the carbon brush body 4 and the commutator 1 is guaranteed, the current density of the carbon brush body 4 is further reduced, the EMI (electro-magnetic interference) effect of the motor is enhanced, and meanwhile the service life of the carbon brush body 4 can be prolonged. When L is greater than or equal to 0.6R, the carbon brush body 4 is excessively deviated from the rotation axis 11 of the commutator 1, and the stability of the abutment of the carbon brush body 4 and the commutator 1 is affected. Preferably, L ═ 0.3R is selected.

It should be noted that the carbon brush bodies 4 on both sides may have unequal eccentric distances with respect to the rotation axis 11 of the commutator 1, so that different attachment areas between the first arc surface 41 and the second arc surface 42 and the commutator 1 are realized on the premise of not changing the shape and arrangement angle of the carbon brush bodies 4.

As a more preferable embodiment of the present invention, as shown in fig. 1, the eccentric direction of the carbon brush body 4 is the same as the rotation direction of the commutator 1, the radian of the arc-shaped end surface of the carbon brush body 4 is the same as the motor rotation direction, and thus the resistance of the carbon brush body 4 to the rotation of the commutator 1 is reduced, the resistance of the eccentric arrangement of the carbon brush body 4 to the rotation of the commutator 1 is reduced, and the purpose of promoting the rotation of the commutator 1 is achieved.

As a preferred embodiment of the present invention, as shown in fig. 1, the width of the carbon brush body 4 is B, the effective width of the commutator segments is c, the groove width between the commutator segments is h, and c +2h < B < 2c +3 h.

The width B of the carbon brush body 4 is limited to meet the requirement, and c +2h is less than B and less than 2c +3h, so that the carbon brush body 4 can only be effectively short-circuited with two commutators 1 at most at every commutation moment of the motor, commutation sparks of the motor can be inhibited, the EMI inhibiting effect of the motor is improved, the starting performance of the motor is improved, and the motor is ensured to run stably and reliably.

When B is less than c +2h, the area of the arc end face of the carbon brush body 4 contacting with the commutator 1 is too small, and the current density of the carbon brush body 4 is increased; when B is more than 2c +3h, the commutation sparks are increased, and a serious EMI phenomenon is caused. Preferably, the slot width between the single plates of each commutator is h between 0.8mm and 1 mm.

As a preferred embodiment of the utility model, as shown in FIG. 6, the fitting clearance on one side of the side wall of the carbon brush body 4 and the side wall of the carbon brush box 3 is H, and H is more than 0.1mm and less than 0.2 mm.

Because the commutation spark is generated when the motor commutates, in order to reduce the commutation spark, a high-impedance carbon brush is usually selected, and the high-impedance carbon brush is easy to bulge under high temperature, so that the carbon brush is stuck in the carbon brush box 3. For improving above-mentioned problem, reserve unilateral fit clearance between carbon brush body 4 lateral wall and carbon brush box 3 lateral wall to inject unilateral fit clearance and satisfy for H, 0.1mm < H < 0.2mm, make not influence carbon brush body 4 under the prerequisite of the fixed effect of installation in carbon brush box 3, can avoid the carbon brush body 4 of too high impedance under high temperature expansion deformation and lead to the dead problem of card. When H is less than 0.1mm, the reservation of the single-side fit clearance is insufficient, and the problem that the carbon brush body 4 is stuck due to heating bulge cannot be solved; when H is greater than 0.2mm, the fitting clearance on one side is too large, resulting in poor fixing effect of the carbon brush body 4 and the carbon brush box 3.

As a preferred embodiment of the present invention, as shown in fig. 1, the bending and extending direction of the spring 5 and the longitudinal direction of the carbon brush body 4 are in the same direction.

One end of the spring 5 is abutted against the tail part of the carbon brush body 4, the bending and extending direction of the spring 5 is consistent with the length direction of the carbon brush body 4, the thrust direction of the elastic force of the spring 5 to the carbon brush body 4 can be consistent with the length extending direction of the carbon brush body 4, and the pre-compression elastic force of the spring 5 can act on two sides of the commutator 1 through the carbon brush body 4 by virtue of the asymmetrical structure of the carbon brush body 4 to form static driving moment, so that the rotation of the commutator 1 is promoted.

The utility model also provides a food processor which applies the low-risk motor, wherein the food processor is at least one of a wall breaking machine, a stirrer, a juicer, a noodle maker and a soymilk maker.

The low-risk motor is provided with an asymmetrical carbon brush structure, so that the end face of the carbon brush body 4 abutted to the commutator 1 is an arc-shaped end face, the effective contact area of the carbon brush body 4 and the surface of the commutator 1 can be increased, the current density of the carbon brush body 4 is reduced, the EMI (electro-magnetic interference) effect of the motor is enhanced, the stability of the output power of the motor is improved, a processing cutter installed on the output shaft of the motor can stably rotate to work, and the reliability of various functions of a food processor is improved.

In addition, the contact surface of the carbon brush body 4 and the commutator 1 is an inclined arc surface, so that the tangent line of the contact position of the carbon brush body 4 and the commutator 1 is in a non-horizontal direction, therefore, under the condition that the elastic force of the spring 5 is certain, the effective pressure of the carbon brush body 4 acting on the surface of the commutator 1 can be properly reduced, the friction between the carbon brush body 4 and the commutator 1 can be further reduced, the abrasion degree of the carbon brush body 4 can be reduced, and meanwhile, the noise generated when the food processor works is reduced.

The technical solutions protected by the present invention are not limited to the above embodiments, and it should be noted that the combination of the technical solution of any embodiment and the technical solution of one or more other embodiments is within the protection scope of the present invention. Although the utility model has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the utility model. Accordingly, such modifications and improvements are intended to be within the scope of the utility model as claimed.

Claims (10)

1. A low risk electric machine comprising:

a stator assembly;

the rotor assembly comprises a rotating shaft and a commutator arranged on the rotating shaft;

the bracket component comprises a bracket body and a carbon brush box, wherein the bracket body is circumferentially provided with a bracket hole, and the carbon brush box is arranged in the bracket hole;

the carbon brush assembly comprises a carbon brush body and a spring, and the carbon brush body is abutted to the commutator in a floating mode along the extending direction of the support hole through the spring;

the carbon brush is characterized in that the end face of the carbon brush body abutted to the commutator is an arc-shaped end face, the arc-shaped end face comprises a first arc face and a second arc face, the first arc face and the second arc face are formed by extending the center of the carbon brush body to two sides, and the first arc face and the second arc face and the commutator respectively have different attaching areas.

2. The low risk motor of claim 1, wherein at least one pair of the carbon brush bodies are offset along their length from a rotational axis of the commutator.

3. The low risk motor of claim 2, wherein the commutator radius is R, the eccentric distance between the carbon brush body and the rotation axis of the commutator is L, and 0 < L < 0.6R.

4. The low risk motor of claim 2, wherein the eccentricity direction of the carbon brush body coincides with a rotation direction of the commutator.

5. The low risk motor of claim 1, wherein the carbon brush body has a width of B, the commutator segments have an effective width of c, the commutator segments have a groove width of h, c +2h < B < 2c +3 h.

6. The low risk motor of claim 1, wherein a single side fit clearance of the carbon brush body side wall and the carbon brush box side wall is H, 0.1mm < H < 0.2 mm.

7. The low risk motor of claim 2, wherein the holder hole is eccentrically disposed at an outer periphery of the holder body, and the carbon brush body is offset from a rotational axis of the commutator with the carbon brush cartridge.

8. The low risk motor of claim 2, wherein the carbon brush body is eccentrically disposed within the carbon brush box, and the carbon brush box is aligned with the bracket hole at a rotational axis of the commutator.

9. The low risk motor of claim 1, wherein the spring deflection direction is in the same direction as the length direction of the carbon brush body.

10. A food processor characterized in that a low risk motor according to any of claims 1-9 is used, said food processor being at least one of a wall breaking machine, a blender, a juicer, a noodle maker, a soymilk maker.

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