CN220190539U - High-efficiency brushless motor stator core and motor with same - Google Patents

Abstract

The stator core is in a circular ring shape and is uniformly provided with nine stator grooves, each stator groove forms a notch in an inner ring, stator tooth parts are formed between the stator grooves, a stator yoke part is formed between the stator grooves and an outer edge, and the inner ring is circular; the outer diameter of the stator core is 75-120 mm; the ratio of the inner diameter to the outer diameter of the stator core is 0.5-0.65; the width of the tooth part of the stator is 6.34-6.64 mm; the width of the stator yoke part is 4.4-4.6 mm; the width of the notch is 1.5-3.5 mm. The optimized stator core has high utilization rate of magnetic circuit materials, reduced cost and improved power density.

Description

High-efficiency brushless motor stator core and motor with same

Technical Field

The utility model relates to a stator of a motor, in particular to a stator core, and also relates to a motor.

Background

The existing vertical wall breaking machine or cooking machine on the market is used as a small household appliance, the total height is higher, and the total height of the stirring cup is more than 600mm, wherein the height of the machine seat is 300mm; because the axial height of the machine seat is higher, the gravity center of the whole machine is raised, and under the condition that the motor rotates at a high speed, the whole machine can shake greatly and simultaneously has larger noise. Therefore, development and popularization of the flat vertical wall breaking machine or chef machine are urgently needed.

In order to achieve flattening of the machine base of the vertical wall breaking machine or the food processor and reduce the axial size of the motor, the motor power is ensured on the premise of reducing the size, the internal structure of the original motor is optimized to improve the power density of the motor, and the optimization of the rotor core is particularly important.

Disclosure of Invention

The first technical problem to be solved by the present utility model is to provide a high-efficiency brushless motor stator core with high power density.

A second technical problem to be solved by the present utility model is to provide a motor with high power density, which aims at the state of the art.

The technical scheme adopted by the utility model for solving the first technical problem is as follows: the stator core is in a circular ring shape and is uniformly provided with nine stator grooves, each stator groove forms a notch on the inner ring, stator tooth parts are formed between the stator grooves, a stator yoke part is formed between the stator grooves and the outer edge, and the inner ring is circular; the outer diameter of the stator core is 75-120 mm; the ratio of the inner diameter to the outer diameter of the stator core is 0.5-0.65; the width of the tooth part of the stator is 6.34-6.64 mm; the width of the stator yoke part is 4.4-4.6 mm; the width of the notch is 1.5-3.5 mm.

Optimally, the outer diameter of the stator core is 82mm; the ratio of the inner diameter to the outer diameter of the stator core is 0.56; the width of the tooth part of the stator is 6.5mm; the width of the stator yoke part is 4.5mm; the width of the notch is 2.5mm.

Further, screw grooves are formed in the outer edge of the stator core.

Further, the outer edge of the stator core is protruded with a positioning step which is in limit fit with a rear end cover of the motor.

Preferably, the axial height of the stator core is 10 to 40mm.

The utility model solves the second technical problem by adopting the technical proposal that: the motor is characterized by comprising a front end cover, a rear end cover, a stator core, a stator winding and a rotor assembly, wherein an accommodating space is formed inside the assembled front end cover and rear end cover, the stator core, the stator winding and the rotor assembly are arranged in the accommodating space, the stator winding is wound on a stator tooth part of the stator core, and the rotor assembly is arranged in an inner ring central hole of the stator core and is provided with an air gap with the inner wall of the stator core.

The rotor assembly can comprise a rotor core, six magnetic steels and a rotating shaft, wherein the six magnetic steels are uniformly embedded on the rotor core, and the rotating shaft is arranged in the middle of the rotor core and one end of the rotating shaft extends out of the front end cover.

The rear end cover in be equipped with the heat dissipation impeller, the other end and the heat dissipation impeller of pivot are connected, correspondingly, rotor core on seted up ventilation louvre, the heat dissipation impeller combines ventilation louvre realization heat dissipation.

Preferably, the rotor core has an outer diameter of 35 to 70mm, and more preferably 45mm.

Preferably, the rotor core has a bridge width of 0.3 to 1.0mm, and more preferably 0.5mm.

Compared with the prior art, the utility model has the advantages that: the inner diameter, the outer diameter, the tooth width of the stator, the yoke width of the stator and the width of the notch of the stator core are optimized, the optimized stator core has high utilization rate of magnetic circuit materials, low cost and high power density, is favorable for realizing the flat design of the motor, is assembled into the motor, is matched with an aluminum enameled wire, has the motor power of 76.5 percent and is matched with a copper enameled wire, and the motor power of 85 percent.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment.

Fig. 2 is an exploded view of fig. 1.

Fig. 3 is an enlarged exploded view of the rotor assembly of fig. 2.

Fig. 4 is a schematic view of a stator core.

Fig. 5 is a schematic view of a rotor core.

Detailed Description

The utility model is described in further detail below with reference to the embodiments of the drawings.

As shown in fig. 1 and 2, the efficient brushless motor in this embodiment includes a front end cover 1, a rear end cover 5, a stator core 2, a heat dissipation impeller 4, a stator winding (not shown in the drawings), a front frame 61, a rear frame 62, and a rotor assembly 3, wherein a space is formed inside the front end cover 1 and the rear end cover 5 after being assembled by screws 52, the stator core 2, the heat dissipation impeller 4, the stator winding, the front frame 61, the rear frame 62, and the rotor assembly 3 are disposed in the space, the front frame 61 and the rear frame 62 are disposed on two sides of the stator core 2, the stator winding is wound on a stator tooth 21 of the stator core 2, and the rotor assembly 3 is disposed in a central hole of an inner ring of the stator core 2 and has an air gap with an inner wall of the stator core 2. The inner side of the rear end cover 5 is provided with a positioning groove 51.

As shown in fig. 3, the rotor assembly 3 includes a rotor core 31, magnetic steels 32, a front end plate 34, a rear end plate 35, and a rotating shaft 33, the magnetic steels 32 are six pieces, uniformly embedded on the rotor core 31, and the rotating shaft 33 is arranged in the middle of the rotor core 31 and has one end extending forward from the front end cover 1. The other end of the rotating shaft 33 is connected with the heat dissipation impeller 4, as shown in fig. 2, the two ends of the rotating shaft 33 are respectively provided with a bearing 71 and a bearing 72, as shown in fig. 5, and the rotor core 31 is provided with a ventilation and heat dissipation hole 312 and a mounting hole 311 for embedding magnetic steel. The heat dissipation impeller 4 rotates to dissipate heat from the ventilation heat dissipation holes 312.

As shown in fig. 4, the stator core 2 is circular and uniformly provided with nine stator slots 24, each stator slot 24 forms a notch 22 in the inner ring, a stator tooth 21 is formed between the stator slots 24, a stator yoke 23 is formed between the stator slots 24 and the outer edge, and the inner ring is circular; screw grooves 25 are formed on the outer periphery of the stator core 2.

The outer edge of the stator core 2 is provided with a positioning step 26 in a protruding mode, the positioning step 26 is matched with a positioning groove 51 in the rear end cover 5, and the stator core is prevented from rotating and slipping at a high speed.

As shown in fig. 4 and 5, the outer diameter of the stator core 2 in the present embodiment82mm; inner diameter of stator core 246mm; the stator tooth 21 has a width H1 of 6.5mm; the stator yoke 23 has a width H3 of 4.5mm; the width H2 of the slot 22 is 2.5mm. The thickness of the rotor core is controlled to be 5-25 mm, the covering power is 200-800W, the thickness is too large, the purpose of flattening cannot be achieved, and the thickness is too small, so that the power is affected. Outer diameter ∈of rotor core 31>45mm. The magnetic gap bridge width H4 of the rotor core 31 is 0.5mm. The whole motor comprises a front end cover and a rear end cover, and the axial height of the front end cover and the rear end cover is 60mm.

The inner diameter, the outer diameter, the tooth width of the stator, the yoke width of the stator and the width of the notch of the stator core are optimized, the optimized stator core has high utilization rate of magnetic circuit materials, low cost and high power density, is favorable for realizing the flat design of the motor, is assembled into the motor, is matched with an aluminum enameled wire, has the motor power of 76.5 percent and is matched with a copper enameled wire, and the motor power of 85 percent.

Claims (10)

1. The stator core of the high-efficiency brushless motor is characterized in that the stator core (2) is in a circular ring shape and is uniformly provided with nine stator grooves (24), each stator groove (24) forms a notch (22) in an inner ring, stator tooth parts (21) are formed between the stator grooves (24), a stator yoke part (23) is formed between the stator grooves (24) and an outer edge, and the inner ring is circular;

the outer diameter of the stator core (2) is 75-120 mm; the ratio of the inner diameter to the outer diameter of the stator core (2) is 0.5-0.65; the width of the stator tooth part (21) is 6.34-6.64 mm; the width of the stator yoke part (23) is 4.4-4.6 mm; the width of the notch (22) is 1.5-3.5 mm.

2. A high efficiency brushless motor stator core according to claim 1, characterized in that the outer diameter of the stator core (2) is 82mm; the ratio of the inner diameter to the outer diameter of the stator core (2) is 0.56; the width of the stator tooth part (21) is 6.5mm; the width of the stator yoke part (23) is 4.5mm; the width of the notch (22) is 2.5mm.

3. A high efficiency brushless motor stator core according to claim 1, characterized in that the outer edge of the stator core (2) is formed with screw grooves (25).

4. A high efficiency brushless motor stator core according to claim 1, characterized in that the outer edge of the stator core (2) is raised with a positioning step (26).

5. An electric motor comprising the high-efficiency brushless motor stator core according to any one of claims 1 to 4, and further comprising a front end cover (1), a rear end cover (5), a stator winding and a rotor assembly (3), wherein a containing space is formed inside the assembled front end cover (1) and rear end cover (5), the stator core (2), the stator winding and the rotor assembly (3) are arranged in the containing space, the stator winding is wound on a stator tooth part (21) of the stator core (2), and the rotor assembly (3) is arranged in an inner ring central hole of the stator core (2) and has an air gap with the inner wall of the stator core (2).

6. The motor of claim 5, wherein the rotor assembly (3) comprises a rotor core (31), magnetic steels (32) and a rotating shaft (33), the six magnetic steels (32) are uniformly embedded on the rotor core (31), and the rotating shaft (33) is arranged in the middle of the rotor core (31) and has one end extending forward from the front end cover (1).

7. The motor according to claim 6, wherein the rear end cover (5) is provided with a heat dissipation impeller (4), the other end of the rotating shaft (33) is connected with the heat dissipation impeller (4), and correspondingly, the rotor core (31) is provided with ventilation heat dissipation holes (312).

8. An electric machine according to claim 6, characterized in that the outer diameter of the rotor core (31) is 35-70 mm.

9. The motor according to claim 6, characterized in that the magnetic barrier bridge width of the rotor core (31) is 0.3-1.0 mm.

10. An electric machine according to claim 5, characterized in that the axial height of the stator core (2) is 10-40 mm.