CN212850003U - Brushless DC motor - Google Patents

Abstract

The utility model relates to a brushless DC motor, include: the refrigerator comprises a shell, a door body and a refrigerator, wherein one end or two ends of the shell are opened, and an accommodating space is formed inside the shell; the stator assembly comprises a stator and a winding arranged on the stator, and is arranged in the accommodating space; a rotor assembly including a rotor connected with an output member to output power; the outer contour of the housing of the brushless direct current motor comprises two parallel straight edges and two arc edges, or the outer contour of the housing of the brushless direct current motor is a regular hexagon, and the inner contour of the housing of the brushless direct current motor is also a regular hexagon. The utility model provides a brushless DC motor possess that the mounting dimension is little, light in weight, the noise is low, and vibration characteristics such as little are showing can satisfy fields such as cars to the small size, lightweight, NVH low grade requirement that this field motor was paid close attention to increasingly.

Description

Brushless DC motor

Technical Field

The utility model belongs to the technical field of the motor, concretely relates to brushless DC motor.

Background

The motor is widely used in automobiles as an important prime mover. Besides being used as a power source to directly drive a power motor for driving a vehicle to run, the motor can also be used for electrically driving various components. For example, the forward and backward movement of the vehicle seat and the adjustment of the backrest angle, the opening and closing of a sunroof, the raising and lowering of a window, the opening and closing of a trunk door, and the like.

One type of electric motor that is widely used in vehicles is a brushless dc motor. Unlike brush DC motor, which has no commutator and replaces mechanical commutator with electronic commutator, the brushless DC motor has the features of excellent speed regulating performance, simple AC motor structure, no commutating spark, reliable operation, easy maintenance, etc.

For example, chinese patent application CN 104518588A discloses a brushless dc motor having a motor housing, a laminated iron yoke, a bobbin, a coil, a rotor, and the like. The outer surface of the motor shell is circular, a containing cavity is formed, and a circular rotor cavity is further formed inside the motor shell. For another example, chinese utility model patent CN 2066640407U discloses a brushless dc motor, which includes a stator core with a circular contour, and an insulating frame and a stator winding are disposed on the stator core.

However, for a brushless dc motor applied to a vehicle, there is still a further demand for downsizing and performance improvement of the motor due to a limitation of an installation space, a requirement of a vehicle NVH, and the like.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem to a certain extent, the utility model provides a following technical scheme.

A brushless dc motor comprising:

the refrigerator comprises a shell, a door body and a refrigerator, wherein one end or two ends of the shell are opened, and an accommodating space is formed inside the shell;

the stator assembly comprises a stator and a winding arranged on the stator, and is arranged in the accommodating space;

a rotor assembly including a rotor connected with an output member to output power;

the outer contour of the housing of the brushless direct current motor comprises two parallel straight edges and two arc edges.

According to an aspect of the present invention, the outer contour of the housing of the brushless dc motor is a symmetrical structure.

The utility model discloses the brushless DC motor of another form is still provided, include:

the refrigerator comprises a shell, a door body and a refrigerator, wherein one end or two ends of the shell are opened, and an accommodating space is formed inside the shell;

the stator assembly comprises a stator and a winding arranged on the stator, and is arranged in the accommodating space;

a rotor assembly including a rotor connected with an output member to output power;

the outer contour of the shell of the brushless direct current motor is a regular hexagon, and the inner contour of the shell of the brushless direct current motor is also a regular hexagon.

According to an aspect of the present invention, the housing of the brushless dc motor is provided with a transition fillet at the junction of every two adjacent sides of the regular hexagon.

According to an aspect of the utility model, the outline of stator is regular hexagon, just the outline of stator with the six sides of the interior outline of casing closely cooperate.

According to an aspect of the present invention, the stator has a plurality of teeth portions, each tooth portion includes a first extension portion and a second extension portion, and one end of the first extension portion is located at one vertex of the hexagon and extends from the vertex toward the center of the stator.

According to an aspect of the present invention, on a side of the first extension portion close to the center of the stator, there is a second extension portion extending to both sides along a direction substantially perpendicular to the extending direction of the first extension portion.

According to an aspect of the present invention, the second extending portion extends in a curved manner, and a shape of a side adjacent to the rotor is an arc.

According to the utility model discloses an aspect, the arc profile of the second extension of six tooth portions one side adjacent with the rotor lies in same circle, and the centre of a circle of the circle at this arc place coincides with the center of hexagon.

According to the utility model discloses an aspect, six tooth evenly distributed, the contained angle between the first extension of two adjacent tooth portions is 60 degrees.

According to the technical scheme of the utility model, the proposed brushless dc motor has a reduced appearance compared with the circular brushless dc motor in the prior art, so the volume is smaller, thereby being capable of adapting to narrower installation space; accordingly, the weight of the motor is also reduced.

Drawings

Exemplary embodiments of the present invention are described with reference to the accompanying drawings, in which:

fig. 1 is a sectional view of a brushless dc motor according to the present invention.

Fig. 2 is a front view of an embodiment of a stator of a brushless dc motor according to the present invention.

Fig. 3 is a schematic view of an embodiment of a stator of a brushless dc motor according to the present invention.

Fig. 4 is a front view of another embodiment of a stator of a brushless dc motor according to the present invention.

Fig. 5 is a schematic view of another configuration of the brushless dc motor according to the present invention.

All the figures are purely diagrammatic and not drawn to scale, and moreover they show only those parts which are necessary for the elucidation of the invention, other parts being omitted or merely mentioned. That is, the present invention may include other components in addition to those shown in the drawings.

Detailed Description

The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in fig. 1, a brushless dc motor according to an embodiment of the present invention includes a housing 1, a stator 2, and a rotor 3. The housing 1 is preferably made of a metal material and is a cylindrical or tubular member having an opening at one end or both ends. The open end of the case 1 is closed by an end cap, thereby forming a receiving space inside thereof. The case 1 forms a yoke serving as a magnetic circuit.

As an embodiment of the present invention, the housing 1 is a hollow cylinder, and the cross section perpendicular to the motor shaft is a regular hexagon. Preferably, transition fillets are provided at respective vertices of the regular hexagon, i.e., at the junction of each two adjacent sides.

The housing space of the housing 1 is provided with a stator 2, a rotor 3, and the like.

The stator 2 is preferably stacked from a plurality of stator laminations. As can be seen from fig. 2, the outer contour of the stator 2 is a regular hexagon matching the inner contour of the housing 1. As an alternative scheme, six sides of each stator lamination are respectively in close fit with six sides of a hexagonal structure part in the motor shell, and six vertex angles are matched with six corresponding internal angles in the motor shell. The stator 2 has six teeth 21 for winding coils, and slots 22 are formed between the respective teeth 21.

A rotor 3 is provided radially inside the stator 2. The rotor 3 is made of a permanent magnet material and adopts a cylindrical structure. The magnetic poles of the rotor 3 may be 4 poles or 8 poles. A circular cavity is provided inside the rotor 3 to accommodate the motor shaft 4. The motor shaft 4 is connected with the rotor 3 in an interference fit manner, so that when the rotor 3 rotates, the motor shaft 4 is driven to rotate to output power.

Fig. 2 shows a particular embodiment of the stator. As can be clearly seen in fig. 2, one end of each tooth of the stator is located at one vertex of the hexagon, and each tooth extends from the vertex toward the center of the hexagon, where a portion of the tooth extending from the vertex toward the center of the hexagon is defined as a first extension. The first extending part is provided with a second extending part which extends towards two sides along the extending direction which is approximately vertical to the first extending part at one side close to the center of the stator. The second extension preferably extends in a curved manner, for example in the shape of an arc of a side adjacent to the rotor, as shown in fig. 2, the centre of which coincides with the centre of the hexagon. More preferably, the arc profiles of the sides of the second extensions of the six teeth adjacent to the rotor lie on the same circle.

In a preferred embodiment, six teeth are uniformly distributed, and the included angle between the first extending parts of two adjacent teeth is 60 degrees.

As can be seen from fig. 1 and 2, the housing of the brushless dc motor of the present invention has a hexagonal structure, so that compared with the prior art brushless dc motor with a circular housing, the volume of the motor is smaller, and the installation on a narrow space on a vehicle is easier.

In addition, the brushless direct current motor adopts a three-phase brushless motor form, and the NVH of the motor can be better through six-step square wave or three-phase sine control.

Fig. 3 shows a particular dimensioning of the stator in fig. 2. As a specific embodiment, it is preferable that the width of the first extension, also referred to as the tooth width, a, is set to a size of 1.0mm or more; and the depth B of the gullets is greater than or equal to 1.5 mm. The thickness C of each side of the stator 2 is preferably greater than or equal to 0.5mm, while the distance D between the second extensions of two adjacent teeth, also called slot width, is greater than or equal to 0.3 mm.

In a specific embodiment, the width E of the opposite side of the outer contour of the stator 2 is preferably 32mm, and the circular diameter F of the arc contour of the side adjacent to the rotor of the second extension of the six tooth grooves is 20.7mm, the tooth width a is 3.0mm, the tooth groove depth B is 3.9mm, the thickness C of the side of the stator is 1.2mm, and the slot width D is 2.0 mm.

Fig. 4 shows a particular embodiment of the stator. The difference with the embodiment of fig. 2 is that the teeth of the stator are all located on the sides of the hexagon, not at the vertices. Preferably, the teeth are located at the midpoint of the edge.

Fig. 5 shows another embodiment of the present invention. As can be seen from fig. 5, the outer contour of the motor is not a hexagonal structure, but a combination of circular arcs and line segments. Specifically, the outer contour of the motor is a combination of two arcs and two line segments, wherein the two line segments are parallel to each other, and the outer contour of the motor is of a symmetrical structure. When the motor is installed, two planes of the outer contour of the motor can be used as installation surfaces. Such a mounting surface also allows for a reduction in the size of the motor relative to a circular motor of the same power.

Having clearly and fully described the present invention with reference to the above illustrative embodiments, it should be understood by those skilled in the art that various other embodiments may be devised which do not depart from the spirit and scope of the invention by modifying the disclosed technology. These embodiments should be understood to fall within the scope of the present invention as determined based on the claims and any equivalents thereof.

Claims (2)

1. A brushless dc motor comprising:

the refrigerator comprises a shell, a door body and a refrigerator, wherein one end or two ends of the shell are opened, and an accommodating space is formed inside the shell;

the stator assembly comprises a stator and a winding arranged on the stator, and is arranged in the accommodating space;

a rotor assembly including a rotor connected with an output member to output power;

it is characterized in that the preparation method is characterized in that,

the outer contour of the housing of the brushless direct current motor comprises two parallel straight edges and two arc edges.

2. A brushless DC motor according to claim 1,

the outer contour of the shell of the brushless direct current motor is of a symmetrical structure.

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