Forced convection external rotor motor

Abstract

The utility model relates to an external rotor motor with forced convection, which solves the technical problem of poor heat dissipation in the prior art. The motor comprises a stator, an outer rotor arranged on the outer side of the stator and an outer rotor end cover arranged at one end of the outer rotor, the outer rotor end cover comprises a shaft sleeve and an end ring coaxially connected to the outer side of the shaft sleeve, and a connecting column matched with the outer rotor is arranged at one end of the end ring in the circumferential direction; the shaft sleeve and the end ring are connected through N fan blades which are uniformly distributed on the circumference; the width of the fan blades is smaller than that of the shaft sleeve; one end of the defining end ring provided with the connecting column is a bottom end, and the other end is a top end; two ends of each fan blade on the same side are respectively connected with the shaft sleeve and the end ring close to the top end edge, and two ends of the other side are respectively connected with the shaft sleeve and the end ring close to the bottom end edge.

Description

TECHNICAL FIELD

[0001] The utility model relates to an outer rotor motor, in particular to a forced convection outer rotor motor. BACKGROUND

[0002] In product design, the motor as the core component of energy conversion, is directly related to the reliability of the whole system. With the development of technology, the outer rotor brushless motor starts to be applied, especially in high efficiency and high reliability working occasion. In order to reduce the weight of the motor, the structure of reinforcing rib is generally used to carry out the hollowing of the end cover of the outer rotor, such as Figure 1 As shown in the outer rotor end cover of the existing outer rotor motor, including the shaft sleeve 01 and the end ring 02 connected with the shaft sleeve 01 through the reinforcing rib 03, the side of the end ring 02 is provided with the connecting column 04 matched with the outer rotor along the circumference. This design can provide sufficient mechanical strength to withstand the stress of the outer rotor in the operation of the motor under the condition of reducing the weight.

[0003] With the improvement of the performance requirement of the motor, the original heat dissipation cannot meet the normal work of the outer rotor motor under certain conditions. A large amount of heat will be generated in the operation of the motor, and the heat accumulation will cause the temperature of the motor to rise, which will affect its performance and service life. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at solving the technical problem of poor heat dissipation in the prior art, and provides a forced convection outer rotor motor.

[0005] In order to realize the above-mentioned purpose, the technical solution provided by the utility model is as follows:

[0006] A forced convection outer rotor motor, comprising a stator, an outer rotor arranged outside the stator and an outer rotor end cover arranged at one end of the outer rotor, the outer rotor end cover comprising a shaft sleeve and an end ring coaxially connected outside the shaft sleeve, one end of the end ring being provided with a connecting column matched with the outer rotor along the circumference; the special feature is that:

[0007] The shaft sleeve and the end ring are connected through N circumferentially distributed fan blades, N is greater than or equal to 3, and N is a natural number; the width W of the fan blade and the diameter D of the shaft sleeve satisfy the relationship: W < D;

[0008] The end ring is defined as the bottom end of the end ring provided with the connecting column, and the other end is the top end;

[0009] Each fan blade is connected with the edge position close to the top end of the shaft sleeve and the end ring at two ends on the same side, and the edge position close to the bottom end of the shaft sleeve and the end ring at two ends on the other side.

[0010] Further, the outer periphery of the end ring is provided with uniformly distributed exhaust holes.

[0011] Further, the exhaust air through holes are waist-shaped holes, and the number M of the exhaust air through holes satisfies the relationship: M=4*N.

[0012] Further, the clockwise direction is defined as the positive direction, the right side of each fan blade is connected with the top end edge of the shaft sleeve and the end ring, and the left side is connected with the bottom end edge of the shaft sleeve and the end ring.

[0013] Further, the cross section of the fan blade is rectangular, streamlined or drop-shaped.

[0014] Further, the fan blade has six.

[0015] The utility model discloses the beneficial effects compared with prior art:

[0016] 1, the utility model discloses a forced convection's outer rotor motor, the reinforcing rib between the shaft sleeve and the end ring is changed into the fan blade form, through the design of fan blade, under the premise of guaranteeing motor rotor strength, the outer rotor motor becomes a kind of special air-cooled motor, and the exhaust air through hole is used to reduce weight, increase the heat dissipation performance of motor, guarantee the premise of the original weight unchanged, and the heat dissipation condition of motor is more excellent.

[0017] 2, the utility model discloses a forced convection's outer rotor motor, is equipped with exhaust air through hole on the outer periphery of end ring, and the heat dissipation performance of motor is increased in combination with fan blade, and more margin is provided for the thermal load design of motor. DRAWINGS

[0018] Figure 1 It is the structural schematic diagram of the outer rotor end cover in the prior art outer rotor motor.

[0019] Figure 1 The reference signs of the drawings are as follows: 01-shaft sleeve;02-end ring;03-reinforcing rib;04-connection column.

[0020] Figure 2 It is the structural schematic diagram of the outer rotor end cover in the utility model a forced convection's outer rotor motor embodiment;

[0021] Figure 3 It is the structural schematic diagram of the utility model embodiment.

[0022] Figures 2-3 The reference signs of the drawings are as follows: 1-shaft sleeve;2-end ring;3-fan blade;4-connection column;5-exhaust air through hole. DETAILED DESCRIPTION

[0023] The specific technical scheme in the utility model embodiment will be further described below with reference to the drawings.

[0024] Referring to Figure 1The utility model provides an outer rotor motor of forced convection, comprising a stator, an outer rotor arranged outside the stator and an outer rotor end cover arranged at one end of the outer rotor, wherein the outer rotor end cover comprises a shaft sleeve 1 and an end ring 2 coaxially connected outside the shaft sleeve 1, and one side of the end ring 2 is provided with a connecting column 4 matched with the outer rotor in the circumferential direction.

[0025] The shaft sleeve 1 and the end ring 2 are connected through the circumferentially distributed fan blades 3, and the number N of the fan blades 3 is 6; the width W of the fan blades 3 and the diameter D of the shaft sleeve 1 satisfy the relationship W < D.

[0026] The end ring 2 is defined as having one end with the connecting column 4 as a bottom end and the other end as a top end.

[0027] The outer periphery of the end ring 2 is provided with evenly distributed air exhaust through holes 5, and the air exhaust through holes 5 are waist-shaped holes, and the number M of the air exhaust through holes 5 is 24.

[0028] The clockwise direction is defined as a positive direction, the right side of each fan blade 3 is connected with the top end edge of the shaft sleeve 1 and the end ring 2, and the left side is connected with the bottom end edge of the shaft sleeve 1 and the end ring 2. The cross section of the fan blade 3 is rectangular.

[0029] When the motor speed is constant, the larger the inner diameter of the fan blade 3 is, the larger the air volume generated by the cutting air is; the larger the torsion angle is, the harder the cutting air is, and the hardness of the blown air is also large; the more the number of the fan blades 3 is, the more intensive the cutting air is, the wind effect is more soft, the air volume is more stable, and the heat dissipation effect is better.

[0030] The above description is only an embodiment of the utility model, and is not a limitation on the protection scope of the utility model. Any equivalent structural transformation, direct or indirect application in other related technical fields based on the content of the utility model specification and drawings is included in the patent protection scope of the utility model. For ordinary skilled persons in the art, it can be understood that the embodiments can be changed, modified, replaced and modified in various ways without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A forced convection outer rotor motor, comprising a stator, an outer rotor arranged outside the stator, and an outer rotor end cover arranged at one end of the outer rotor, the outer rotor end cover comprising a shaft sleeve (1) and an end ring (2) coaxially connected outside the shaft sleeve (1), one end of the end ring (2) being provided with a connecting column (4) matched with the outer rotor in the circumferential direction; characterized in that: N circumferentially distributed fan blades (3) are arranged between the shaft sleeve (1) and the end ring (2), N≥3, and N is a natural number; the width W of the fan blade (3) and the diameter D of the shaft sleeve (1) satisfy the relationship: W<D; the end ring (2) is defined as having one end provided with the connecting column (4) as a bottom end, and the other end as a top end; each of the fan blades (3) is connected to the shaft sleeve (1) and the end ring (2) at the edge position close to the top end on the same side, and is connected to the shaft sleeve (1) and the end ring (2) at the edge position close to the bottom end on the other side.

2. The forced convection outer rotor motor according to claim 1, characterized in that: the outer periphery of the end ring (2) is provided with evenly distributed exhaust holes (5).

3. The forced convection outer rotor motor according to claim 2, characterized in that: the exhaust holes (5) are waist-shaped holes, and the number M of the exhaust holes (5) satisfies the relationship: M=4*N.

4. The forced convection outer rotor motor according to any one of claims 1-3, characterized in that: the clockwise direction is defined as the positive direction; the right side of each of the fan blades (3) is connected to the top end edge of the shaft sleeve (1) and the end ring (2), and the left side is connected to the bottom end edge of the shaft sleeve (1) and the end ring (2).

5. The forced convection outer rotor motor according to claim 4, characterized in that: the cross section of the fan blade (3) is rectangular, streamlined or drop-shaped.

6. The forced convection outer rotor motor according to claim 5, characterized in that: the fan blade (3) has six. ​ ​ ​ ​ ​ ​ ​ ​ ​

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