CN207339610U - A kind of motor on unmanned vehicle - Google Patents

Abstract

The utility model provides a motor used for an unmanned aerial vehicle. It belongs to the technical field of rotating electric machines. Aiming at the problem that the existing motor is difficult to take into account the rainproof and the heat dissipation of the motor, a motor structure scheme is proposed. The motor includes a stator part and a rotor part, wherein the stator includes a motor base (15), an excitation winding (14), a magnetic circuit stator core (13), and a bearing, and the rotor includes a central shaft rod (7), a rotor cup (9), a permanent magnets (12). The improvement points are that the bottom of the rotor cup (9) is provided with reinforcing ribs (8), the outside of the cup wall of the rotor cup (9) is provided with spiral heat dissipation lines (10), and the motor base (15) and the rotor cup (9) exist nested relationship. The ability of the motor to prevent rain and dissipate heat when working in rainy days is improved.

Description

A motor for an unmanned aerial vehicle

technical field

The utility model relates to the technical field of rotating electrical machines, in particular to an electrical machine used for unmanned flying aircraft, and provides an electrical machine with both rainproof and heat dissipation functions.

Background technique

Multi-axis unmanned aerial vehicles, especially four-axis unmanned aerial vehicles, have become popular commodities. The power devices used on a single axis are mainly three-phase AC brushless motors, and the motors are mainly used vertically or inverted. The main heat dissipation method of the motor is as follows: There are vents through the bottom of the rotor cup and the base of the motor, usually 3 or 4. When the motor is working, external cold air can pass through these openings to form heat exchange between the inside of the motor and the outside to achieve the purpose of cooling the inside of the motor.

The fatal flaw of using air convection to dissipate heat is that when the aircraft flies in rainy days, rainwater will enter the motor through the bottom of the rotor cup of the motor or the through opening of the motor base, so a slight crack in the insulation layer of the excitation winding will affect the normal operation of the motor. After the aircraft completes the flight, measures must also be taken to dry the rainwater inside the motor, otherwise the magnetic circuit stator core made of laminated silicon steel sheets is easily corroded in a humid environment, which will affect the life of the motor.

Contents of the invention

In order to overcome the defects of existing motors when working in rainy days, the utility model provides a motor that can work in rainy days and has both rainproof and heat dissipation functions.

The motor includes a stator part and a rotor part. The stator includes a motor base, a magnetic circuit stator core, an excitation winding, a bearing, and a lead wire; There are spiral heat dissipation lines on the outside of the cup wall, and there is a nesting relationship between the rotor cup and the motor base.

The cup bottom of the rotor cup is provided with reinforcing ribs, and there are no less than 2 reinforcing ribs. Each reinforcing rib is centered on the central axis and distributed radially in a uniform circular array. The cup bottom of the rotor cup has no holes.

Beneficial effects: the provision of reinforcing ribs can increase the surface area of the bottom of the rotor cup, ensure the strength of the cup bottom of the rotor cup, and reduce the thickness of the cup wall between adjacent reinforcing ribs, which is beneficial to heat dissipation; the bottom of the rotor cup has no holes, which enhances the motor The airtightness is good for rainproof.

The outside of the cup wall of the rotor cup is provided with spiral heat dissipation patterns, and the spiral heat dissipation patterns are divided into two types: forward spiral heat dissipation patterns and reverse spiral heat dissipation patterns. The spiral heat dissipation pattern (10) can also be replaced by parallel annular heat dissipation patterns.

Beneficial effects: the spiral heat dissipation pattern increases the surface area of the outer side of the cup wall, which is good for heat dissipation; when the motor is working, the spiral heat dissipation pattern on the outer side of the cup wall of the rotor cup rotates with the rotor, and due to its spiral structure, it can accelerate the outer side of the cup wall when rotating Air circulation speed is good for heat dissipation. Replacing the spiral heat dissipation pattern (10) with parallel annular heat dissipation patterns can reduce the difficulty of mechanical processing.

For vertical motors, that is, motors whose motor base is on the near-ground side, the motor base is nested in the cup opening of the rotor cup; for inverted motors, that is, motors whose motor base is on the far-earth side, the cup opening Nested in the motor base.

Beneficial effects: different nesting relationships are adopted for motors under different working conditions. For a vertical motor, when the rainwater flows down the outer side of the cup wall of the rotor cup, since the stator base is nested in the cup mouth of the rotor cup, there is a connection relationship between the two, so that the rainwater flows away along the motor base, reducing the rainwater flow. The possibility of entering the inside of the motor; similarly, for an inverted motor, the rainwater flows down along the motor base. Since the mouth of the rotor cup is nested in the motor base, there is a connection relationship between the two, so that the rainwater flows down the cup of the rotor cup. The outside of the wall flows away, which is conducive to rain protection.

Description of drawings

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in further detail, and the lead wire of motor, bearing, the screw port that plays a fixing role on the motor base are omitted in the accompanying drawing. in:

Figure 1 is a schematic diagram of a common motor

Figure 2 is an exploded view of a common motor.

Figure 3 is a schematic diagram of the motor used in vertical

Figure 4 is an exploded view of the motor for vertical use

Fig. 5 Partial dissection diagram of the motor used in vertical position.

Figure 6 is a schematic diagram of the motor used in reverse

Fig. 7 is a partial sectional view of the motor used in the inverted type.

Detailed ways

Embodiment one

Accompanying drawing 3 to Fig. 5 have shown the first embodiment of the electric motor of the present invention, and it is the electric motor of vertical use, comprises the core structure of existing electric machine, and it is mainly made of stator and rotor, and wherein stator comprises motor base ( 15), field winding (14), magnetic circuit stator core (13), bearings, leads, and the rotor includes central shaft (7), rotor cup (9), and permanent magnets (12).

The motor base (15), excitation winding (14), magnetic circuit stator core (13), bearings, and lead wires form a fixed whole. After the excitation winding (14) is connected to 3-phase alternating current, it forms a rotation centered on the axis of the stator. magnetic field. The magnetic circuit stator core (13) is usually made of laminated silicon steel sheets, which is cylindrical, with a through hole in the center, and a plurality of pole shoes on the longitudinal outer side, usually 12 poles and 16 poles, and this embodiment is 16 poles The number of sets of field windings of the complete motor is the same as the number of pole shoes, and the field windings (14) are placed on the pole shoes; the lead wires pass through the base of the motor to provide electric energy for the field windings (14).

The rotor formed by the central axis rod (7), the rotor cup (9) and the permanent magnet (12) is a fixed whole. The number of permanent magnets (12) is the same as the number of pole shoes of the magnetic circuit stator core, and the present embodiment is 16 pieces, and the permanent magnets (12) are placed inside the cup wall of the rotor cup. The central shaft rod runs through the center of the cup bottom of the rotor cup (9).

The central shaft rod (7) of the rotor passes through the through hole of the stator iron core (13) of the magnetic circuit, so that the stator and the rotor of the motor form an integral body.

The cup bottom of the rotor cup (9) is provided with reinforcing ribs (8), and the number of reinforcing ribs (8) is not less than 2. Each reinforcing rib is centered on the central shaft (7) and distributed radially in a uniform circular array. This implementation Example is 4.

There is no through hole at the bottom of the cup of the rotor cup (9).

The outer side of the rotor cup (9) is provided with spiral heat dissipation patterns (10), and the spiral heat dissipation patterns (10) are divided into two types: forward spiral heat dissipation patterns and reverse spiral heat dissipation patterns. Taking a vertical motor as an example, the so-called positive spiral heat dissipation pattern means that when the motor rotates clockwise, the spiral pattern has an upward push effect on the air outside the cup wall; the so-called reverse spiral heat dissipation pattern means that when the motor rotates clockwise, The spiral pattern pushes down the surrounding air on the outside of the cup wall. The classification of the spiral heat dissipation lines (10) of the motor used in the inverted type can be obtained in the same way.

In order to reduce the processing difficulty of the spiral heat dissipation pattern (10), the spiral heat dissipation pattern can be replaced by parallel annular heat dissipation patterns. The so-called parallel annular heat dissipation lines mean that there are multiple parallel closed annular heat dissipation lines on the outer side of the rotor cup (9), and the single annular heat dissipation lines are independent of each other. But experiments have shown that this replacement also reduces thermal performance.

There is a nesting relationship between the motor base (15) and the rotor cup (9). This embodiment is a motor for vertical use, and its characteristic is that the stator base (15) is nested in the cup opening of the rotor cup (9). See attached drawing 4 .

After the central shaft (7) passes through the stator base (15), buckle the exposed end of the central shaft (7) to prevent the rotor from sliding out of the stator base (15) when it rotates, and then use the cap to cover the exposed end of the central shaft (7). The end of the central shaft (7) is covered, and the cap has no contact with the exposed end of the central shaft (7), and the cap and the stator base (15) are combined into a detachable whole.

The stator base (15) contains a lead wire channel, and the lead wire passes through the lead wire channel of the stator base (15) to connect with the excitation winding (14), and the gap formed on the stator base (15) is filled with a plugging material, such as glue or the like.

The stator base (15) contains screw ports for fixing the motor, and the depth of the screw ports is smaller than the thickness of the stator base. The stator base (15) does not have any other through-holes except the through-space formed by the passage of the lead wires and the central shaft rod (7).

Embodiment two

Figures 6 to 7 show the second implementation of the new type of motor used in this invention---a motor used in an upside-down manner. It is roughly the same as the motor used in the vertical type. The distinguishing feature is that the outer diameter of the stator base (16) is larger than the outer diameter of the cup opening of the rotor cup (18). (18), the cup mouth of the rotor cup (18) is nested in the stator base (16).

The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those of ordinary skill in the art. For example, change the number of ribs and change the thread density of the spiral heat dissipation lines. But such changes should all fall within the scope of protection of the claims of this patent.

Claims (5)

1. a kind of motor on unmanned vehicle, including stationary part and rotor portion,

Wherein stator includes motor base（15）, Exciting Windings for Transverse Differential Protection（14）, magnetic circuit stator core（13）, bearing, lead；

Rotor includes central shaft rod（7）, rotor cup（9）, permanent magnet（12）；

It is characterized in that, rotor cup（9）Bottom of a cup be equipped with reinforcing rib（8）, rotor cup（9）Wall of cup on the outside of be equipped with spiral heat dissipation line （10）；Rotor cup（9）With motor base（15）There are nest relation.

2. motor according to claim 1, it is characterised in that reinforcing rib（8）No less than 2, each reinforcing rib（8）With axis Bar（7）Centered on, it is distributed in uniform annular array-like, overall reinforcing rib（8）It is radial, rotor cup（9）Bottom of a cup without through Hole.

3. motor according to claim 2, it is characterised in that rotor cup（9）Spiral heat dissipation line on the outside of wall of cup（10）It is divided into Right-handed screw heat dissipation line and backpitch two kinds of line of heat dissipation.

4. motor according to claim 3, it is characterised in that motor base（15）It is nested in rotor cup（9）Rim of a cup in.

5. motor according to claim 3, spiral heat dissipation line is replaced with parallel ring-type heat dissipation line（10）.