CN202076863U - Rotor assembly - Google Patents

Abstract

The utility model discloses a rotor subassembly, including pivot (1), rotor core (2) and install a plurality of permanent magnet (3) at rotor core (2) lateral surface, nested protection casing (4) in permanent magnet (3) outside, protection casing (4) include a plurality of arcs (41) and a plurality of straight board (42), and arc (41) inside wall face pastes tight permanent magnet (3) lateral surface, and two adjacent arcs (41) pass through straight board (42) and pass through, the utility model discloses a change the protection casing shape, make protection casing and permanent magnet be face contact, the gap is little, and increase cohesion, the manufacturability is good, guarantees that the protection casing is difficult for droing in the motor operation.

Description

A rotor assembly

Technical field:

The utility model relates to a rotor assembly, which belongs to the field of brushless motors.

Background technique:

The rotor assembly of a traditional brushless motor, as shown in Figure 1, includes a rotating shaft 1, a rotor core 2, and a permanent magnet 3. In order to prevent the surface of the permanent magnet 3 from rusting or falling off, a protective cover 4 is pressed into the circumference of the permanent magnet 3 , when the permanent magnet 3 is an eccentric permanent magnet, the protective cover 4 and the permanent magnet 3 are in line contact, the contact area is small, the gap between the protective cover 4 and the permanent magnet 3 is large, and the bonding force depends entirely on the permanent magnet 3 and the protective cover 4 Cooperating with the tightness, the manufacturability cannot be guaranteed, and the protective cover 4 is easy to fall off during the rotation process, losing the function of protecting the permanent magnet 3 .

Invention content:

The purpose of this utility model is to provide a rotor assembly. By changing the shape of the protective cover, the protective cover is in surface contact with the permanent magnet, the gap is small, the bonding force is increased, the manufacturability is good, and the protective cover is not easy to fall off during the operation of the motor.

The purpose of this utility model is achieved through the following technical solutions.

A rotor assembly, including a rotating shaft, a rotor core, and a number of permanent magnets installed on the outer surface of the rotor core. A protective cover is nested outside the permanent magnet. The protective cover includes a number of arc-shaped plates and a number of straight plates. On the outer side of the permanent magnet, the transition between two adjacent arc-shaped plates is through a straight plate.

The straight plate mentioned above is tangent to the outer wall surfaces of two adjacent permanent magnets.

As mentioned above, the flanging is folded inward at the bottom of the protective cover, and the flanging and the bottom of the permanent magnet form a cavity.

The above-mentioned rotor core is provided with several positioning bosses, which are evenly distributed on the outer surface of the stator iron core in the circumferential direction and separate two adjacent permanent magnets.

The above-mentioned curved plates and permanent magnets have the same quantity.

The quantity of above-mentioned straight plate and permanent magnet is equal.

The quantity of above-mentioned curved plate and straight plate is equal.

The above-mentioned curved plate, straight plate and flange are integrally cast.

Compared with the prior art, the utility model has the beneficial effects as follows: 1) the protective cover includes several arc-shaped plates and some straight plates, the inner wall surface of the arc-shaped plates is close to the outer surface of the permanent magnet, and the transition between two adjacent arc-shaped plates is through the straight plates , the structure makes the protective cover and the permanent magnet in surface contact, the gap is small, the bonding force is increased, the manufacturability is good, and the protective cover is not easy to fall off during the operation of the motor; 2) The straight plate is tangent to the outer wall of the two adjacent permanent magnets , the contact area between the protective cover and the permanent magnet is the largest, and the fastening effect is good; 3) The bottom of the protective cover is folded inward and the flanging is formed, and the flanging and the bottom of the permanent magnet form a cavity. Balance; 4) There are several positioning bosses on the rotor core, which are evenly distributed on the outer surface of the stator core and separate the two adjacent permanent magnets. The permanent magnets are easy to install and accurate in positioning; 5 ) Curved plate, straight plate and flanging are integrally cast, suitable for mass production and high production efficiency.

Description of drawings:

Fig. 1 is a structural schematic diagram of a rotor assembly in the prior art;

Fig. 2 is a structural representation of the utility model;

Fig. 3 is a partial enlarged view of A-A of Fig. 2;

Fig. 4 is a perspective view of the utility model;

Fig. 5 is a sectional view of the utility model.

Detailed ways:

The utility model will be described in further detail below through specific embodiments in conjunction with the accompanying drawings.

As shown in Figure 2, Figure 3, Figure 4 and Figure 5, a rotor assembly of the present invention includes a rotating shaft 1, a rotor core 2 and a number of permanent magnets 3 installed on the outer surface of the rotor core 2, the permanent magnets 3 The protective cover 4 is nested outside, and the protective cover 4 includes some arc-shaped plates 41 and some straight plates 42. The inner wall surface of the arc-shaped plates 41 is close to the outer surface of the permanent magnet 3, and two adjacent arc-shaped plates 41 pass through the straight plate 42; the straight plate 42 It is tangent to the outer wall surfaces of two adjacent permanent magnets 3; the flange 43 is folded inward at the bottom of the protective cover 4, and the flange 43 and the bottom of the permanent magnet 3 form a cavity 5; the rotor core 2 is provided with a number of positioning Boss 21, a number of positioning bosses 21 are evenly distributed on the outer surface of stator core 2 and spaced apart two adjacent permanent magnets 3; the number of arc-shaped plates 41 and permanent magnets 3 is equal; straight plate 42 and permanent magnets The number of 3 is equal; the number of the curved plate 41 and the straight plate 42 is equal; the curved plate 41, the straight plate 42 and the flange 43 are integrally cast. The rotor of the present utility model comprises a rotating shaft 1, a rotor iron core 2 and a number of permanent magnets 3 installed on the outer surface of the rotor iron core 2. The outer side of the permanent magnet 3 is nested with a protective cover 4, and the protective cover 4 includes a plurality of arc-shaped plates 41 and a plurality of straight plates. 42. The inner wall surface of the arc-shaped plate 41 is close to the outer surface of the permanent magnet 3, and two adjacent arc-shaped plates 41 are transitioned through the straight plate 42. The design shape of the protective cover 4 is the same as the outer contour shape of the rotor permanent magnet 3, so that the protective cover 4 and the permanent magnet 3 are in the same shape. The magnet 3 is in surface contact, and the bonding force is increased. The protective cover 4 is designed to be connected with a straight plate 42 between two adjacent permanent magnets 3, so that the protective cover 4 is square or polygonal in shape. Since the shape is square or polygonal, the motor runs During the process, the protective cover 4 will not fall off, effectively protecting the permanent magnet 3 .

Claims (8)

1. A rotor assembly, comprising a rotating shaft (1), a rotor core (2) and several permanent magnets (3) installed on the outer surface of the rotor core (2), characterized in that: the permanent magnets (3) are nested outside Protective cover (4), protective cover (4) comprises some arc-shaped plates (41) and some straight plates (42), and the inner wall surface of arc-shaped plate (41) is close to the outer surface of permanent magnet (3), and two adjacent arc-shaped The plates (41) transition through straight plates (42). 2. A rotor assembly according to claim 1, characterized in that the straight plate (42) is tangent to the outer wall surfaces of two adjacent permanent magnets (3). 3. A rotor assembly according to claim 1 or 2, characterized in that: the flange (43) is folded inward at the bottom of the protective cover (4), and the flange (43) is connected to the bottom of the permanent magnet (3) A cavity (5) is formed. 4. A rotor assembly according to claim 1 or 2, characterized in that: the rotor core (2) is provided with a number of positioning bosses (21), and the number of positioning bosses (21) are evenly distributed around the stator The outer surface of the iron core (2) separates two adjacent permanent magnets (3). 5. A rotor assembly according to claim 1 or 2, characterized in that the numbers of arc-shaped plates (41) and permanent magnets (3) are equal. 6. A rotor assembly according to claim 1 or 2, characterized in that the numbers of straight plates (42) and permanent magnets (3) are equal. 7. A rotor assembly according to claim 1 or 2, characterized in that the number of arc-shaped plates (41) and straight plates (42) is equal. 8. A rotor assembly according to claim 3, characterized in that: the curved plate (41), the straight plate (42) and the flange (43) are integrally cast.

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