CN210629313U

CN210629313U - Contra-rotating double-rotor brushless DC motor

Info

Publication number: CN210629313U
Application number: CN201921140247.8U
Authority: CN
Inventors: 虞一扬
Original assignee: Guanyue Aviation Technology Hangzhou Co Ltd
Current assignee: Guanyue Aviation Technology Hangzhou Co Ltd
Priority date: 2019-04-23
Filing date: 2019-07-19
Publication date: 2020-05-26
Anticipated expiration: 2029-07-19
Also published as: CN111835167A

Abstract

The utility model discloses a to changeing brushless DC motor of birotor. The two rotors are connected through the synchronizing mechanism, and the synchronizing mechanism is used for enabling the two rotors to synchronously rotate oppositely at the same speed. The utility model discloses can drive two rotor relative antiport through two upper and lower rotor relative antiport, only use a stator, alleviate weight, save the cost, simple structure, easily control.

Description

Contra-rotating double-rotor brushless DC motor

Technical Field

The utility model relates to the technical field of electric machines, especially, relate to a to changeing brushless DC motor of birotor.

Background

The existing motor generally comprises a stator and a rotor, one motor corresponds to one rotation direction, when the motor is applied to a multi-rotor aircraft and requires two rotors which rotate up and down in the same position, only two motors can be used for driving the two rotors, so that two groups of stator windings are needed, and the copper loss and the iron loss of the motors are doubled; the copper for manufacturing the coil and the iron for manufacturing the magnetic core have great specific gravity, and the increased weight partially offsets the lift force advantage brought by the contra-rotating dual rotors; meanwhile, two sets of BLDC controllers are also required to be configured for using two motors, which increases the cost at a cost in addition to the increase of power consumption.

Compared with the common helicopter, the coaxial double-rotor helicopter has unique advantages, but the coaxial double-rotor helicopter realized by a pure mechanical structure has a complex transmission structure and increased weight.

Disclosure of Invention

The utility model discloses a solve above-mentioned technical problem, provide a to changeing brushless DC motor of birotor, it can be through two relative antiport of rotor relative antiport drive two rotor relative antiport from top to bottom, only uses a stator, has alleviateed weight, has saved the cost, simple structure, easily control.

In order to solve the problem, the utility model discloses a following technical scheme realizes:

the utility model discloses a to changeing brushless DC motor of birotor, including two rotors that the longitudinal symmetry set up, be equipped with between two rotors and be used for driving two relative opposite direction pivoted stators of rotor, still be equipped with lazytongs between two rotors, two rotors pass through lazytongs and connect, lazytongs is used for making two rotors can be in step opposite direction with fast contra-rotating.

In this scheme, two rotors longitudinal symmetry set up, and the axis of two rotors is located same straight line. The stator is positioned between the two rotors and is used for driving the two rotors to rotate oppositely. The synchronous mechanism is used for enabling the upper rotor and the lower rotor to synchronously rotate forwards and reversely, and the rotating speeds of the two rotors are guaranteed to be the same. The upper rotor and the lower rotor rotate oppositely at the same speed and can drive the two rotors to rotate oppositely at the same speed and reversely. The motor structure of the scheme is only provided with one stator, so that the motor reduces the weight, saves the cost, and is simple in structure and easy to control.

Preferably, the synchronizing mechanism comprises two linkage gears and at least one synchronizing gear, one linkage gear is coaxially connected with the rotor above, the other linkage gear is coaxially connected with the rotor below, the linkage gears are sleeved on a longitudinal shaft longitudinally arranged through bearing sleeves, the synchronizing gear is positioned between the two linkage gears and meshed with the two linkage gears, and the synchronizing gear is sleeved on a transverse shaft transversely arranged through the bearing sleeves. When the rotors rotate, the linkage gears are driven to rotate, the upper linkage gears and the lower linkage gears rotate reversely to output force to the synchronous gears to drive the synchronous gears to rotate, and the synchronous gears enable the upper rotors and the lower rotors to rotate synchronously and reversely, so that the two rotors are guaranteed to have the same rotating speed.

Preferably, the transverse axis and the longitudinal axis are perpendicular to each other, and an axis of the transverse axis intersects an axis of the longitudinal axis.

Preferably, one end of the transverse shaft is fixedly connected with the longitudinal shaft, and the other end of the transverse shaft is fixedly connected with the stator.

Preferably, the linkage gear and the synchronizing gear are both bevel gears.

Preferably, the stator is fixedly connected with the longitudinal shaft through a connecting mechanism, the connecting mechanism comprises at least one connecting shaft which is transversely arranged, one end of the connecting shaft is fixedly connected with the longitudinal shaft, and the other end of the connecting shaft is fixedly connected with the stator. The stator is fixed on the longitudinal shaft through a connecting shaft.

Preferably, the stator comprises an annular support coaxial with the longitudinal axis, a plurality of stator windings are arranged on the outer wall of the annular support along the circumference, the stator windings are longitudinally arranged, the rotor comprises a circular turntable coaxial with the longitudinal axis, a plurality of permanent magnets are arranged on the outer edge of the circular turntable along the circumference, one end magnetic poles of each circular turntable, facing the stator windings, of the adjacent permanent magnets are opposite, the permanent magnets on the upper rotor are located above the top magnetic poles of the stator windings, and the permanent magnets on the lower rotor are located below the bottom magnetic poles of the stator windings. The top magnetic pole and the bottom magnetic pole of the stator winding are opposite, and the top magnetic pole and the bottom magnetic pole of the stator winding are continuously changed so as to push the upper rotor and the lower rotor to oppositely rotate.

Preferably, the definition windings are distributed at equal intervals along the outer wall of the annular support, and the permanent magnets are distributed at equal intervals along the outer edge of the circular turntable. And the diameter of the circle formed by all the permanent magnets on the circular turntable is the same as that of the circle formed by all the stator windings.

Preferably, the annular support is provided with a plurality of Hall sensors. The Hall sensors can be distributed at 120 degrees or 60 degrees along the circumferential direction of the annular support, the output of the Hall sensors is connected to the rotating speed controller, the rotating speed of the rotor is detected through the Hall sensors, and the Hall sensors are arranged to better control the rotation of the motor and enable the motor to rotate more stably; in some occasions with low requirements on stability, a Hall sensor can be omitted, and a corresponding Hall-free rotating speed controller is adopted to control the rotation of the motor.

Preferably, the outer wall of the annular bracket is circumferentially provided with a plurality of mounting grooves for mounting the stator winding, and the top and the bottom of each mounting groove are opened. Stator winding includes the column magnetic core and the coil of coiling on the magnetic core, and the opening at magnetic core top orientation mounting groove top, the opening of magnetic core bottom orientation mounting groove bottom.

Preferably, the axes of the two rotors are located on the same straight line.

The utility model has the advantages that: (1) can drive two rotors to rotate in opposite directions through two upper and lower rotors to rotate in opposite directions relatively, make upper rotor, lower rotor constant speed counter-rotating through a lazytongs, only use a stator, lighten weight, saved the cost, simple structure, easily control. (2) The multi-rotor aircraft propeller driving device is very suitable for being applied to multi-rotor aircraft, can replace a common brushless direct current motor, can simultaneously drive two propellers only by one counter-rotating dual-rotor brushless direct current motor, can obtain larger thrust at the same rotating speed, or can reach the same thrust at a lower rotating speed, and therefore the multi-rotor aircraft has longer endurance time or larger load capacity. (3) The coaxial dual-rotor helicopter is simpler in structure and simpler in control compared with the existing coaxial dual-rotor helicopter with a pure mechanical structure, and the coaxial dual-rotor helicopter driven by the counter-rotating dual-rotor brushless direct current motor can be used for constructing the electrically-driven coaxial dual-rotor helicopter, so that the helicopter can be brought into an electrically-driven hybrid power era.

Drawings

Fig. 1 is a schematic view of the internal structure of the present invention;

FIG. 2 is a top view of the annular stent;

FIG. 3 is a side view of the ring stent;

FIG. 4 is a schematic view of the structure of the rotor;

fig. 5 is a schematic view of the working principle of the present invention.

In the figure: 1. the device comprises a longitudinal shaft, 2, a linkage gear, 3, a synchronous gear, 4, a transverse shaft, 5, a connecting shaft, 6, an annular support, 7, a stator winding, 8, a circular turntable, 9, a permanent magnet, 10 and a mounting groove.

Detailed Description

The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.

Example (b): the counter-rotating dual-rotor brushless direct current motor of the embodiment, as shown in fig. 1, fig. 2, fig. 3 and fig. 4, includes two rotors which are arranged in an up-down symmetry manner, the axes of the two rotors are located on the same straight line, a stator for driving the two rotors to rotate in opposite directions is arranged between the two rotors, a synchronizing mechanism is further arranged between the two rotors, the two rotors are connected through the synchronizing mechanism, and the synchronizing mechanism is used for enabling the two rotors to counter-rotate in opposite directions at the same speed and in the same direction.

The synchronous mechanism comprises two linkage gears 2 and two synchronous gears 3, one linkage gear 2 is coaxially connected with a rotor above, the other linkage gear 2 is coaxially connected with a rotor below, the linkage gears 2 are sleeved on a longitudinal shaft 1 which is longitudinally arranged through bearings, the synchronous gears 3 are positioned between the two linkage gears 2 and are meshed with the two linkage gears 2, and the synchronous gears 3 are sleeved on a transverse shaft 4 which is transversely arranged through bearings.

The stator includes the cyclic annular support 6 coaxial with axis of ordinates 1, the lazytongs is located cyclic annular support 6 inboardly, 6 outer walls of cyclic annular support are equipped with 24 stator winding 7 along the circumference equidistant, stator winding 7 is along vertically setting up, the rotor includes the circular carousel 8 coaxial with axis of ordinates 1, the circular carousel 8 outer fringe is equipped with 28 permanent magnet 9 along the circumference equidistant, adjacent permanent magnet 9 is opposite towards the one end magnetic pole of stator winding 7 on every circular carousel 8 (namely 28 permanent magnet is 14S poles and 14N poles altogether towards the magnetic pole of stator winding one end, S pole and N pole separate the setting, an S pole, 1N pole … … so circulate the circle), permanent magnet 9 on the rotor of top is located stator winding 7 'S top magnetic pole top, permanent magnet 9 on the rotor of below is located stator winding 7' S bottom magnetic pole below. And the diameter of the circle formed by all the permanent magnets on the circular turntable is the same as that of the circle formed by all the stator windings. Two linkage gears are symmetrically arranged on the opposite surfaces of the two circular turntables, and each linkage gear is fixedly connected with the circular turntable.

The horizontal shaft 4 is perpendicular to the vertical shaft 1, the axis of the horizontal shaft 4 is intersected with the axis of the vertical shaft 1, the two horizontal shafts 4 are coaxial, one end of the horizontal shaft 4 is fixedly connected with the vertical shaft 1, the other end of the horizontal shaft 4 is fixedly connected with the annular bracket 6, and the linkage gear 2 and the synchronous gear 3 are both conical gears.

The stator passes through coupling mechanism and axis of ordinates 1 fixed connection, and coupling mechanism includes two connecting axle 5 that transversely set up, 5 one end of connecting axle and axis of ordinates 1 fixed connection, 5 other ends of connecting axle and 6 fixed connection of annular support, and two connecting axles 5 are coaxial, and connecting axle 5 and cross axle 4 mutually perpendicular. The stator is fixed on the longitudinal shaft through the transverse shaft and the connecting shaft to form a whole body so as to ensure the normal operation of the contra-rotating dual-rotor brushless direct current motor.

In this scheme, two rotors longitudinal symmetry set up, and the axis of two rotors is located same straight line. The stator is positioned between the two rotors and is used for driving the two rotors to rotate oppositely. The synchronous mechanism is used for enabling the upper rotor and the lower rotor to synchronously rotate forwards and reversely, and the rotating speeds of the two rotors are guaranteed to be the same. The upper rotor and the lower rotor rotate oppositely at the same speed and can drive the two rotors to rotate oppositely at the same speed and reversely. The motor structure of the scheme has only one stator, so that the motor reduces the weight, saves the cost, has a simple structure, and is easy to control

The linkage gear and the synchronous gear are tightly meshed, so that the linkage gear and the synchronous gear rotate at equal proportional speeds, and due to the existence of the synchronous mechanism, the upper rotor and the lower rotor can only rotate in opposite directions at the same speed, which is very important and is one of key technologies for normal operation of the counter-rotating dual-rotor brushless direct current motor. The 24 stator windings and the 28 permanent magnets in the upper rotor and the lower rotor jointly form a driving mechanism, so that the purpose of converting electric energy into mechanical energy is achieved, and the counter-rotating dual-rotor brushless direct current motor can rotate and output power outwards.

All gears in the synchronous mechanism are conical gears, in the embodiment, spiral bevel gears are used, and although the gears are high in manufacturing cost, the gears are good in using effect and low in noise. The number of the permanent magnets arranged on the upper rotor and the lower rotor is 28, the upper rotor and the lower rotor are in mirror symmetry, and the permanent magnets can be interchanged when in use, so that the use is not influenced.

The working principle of the scheme is as shown in fig. 5, the magnetic poles at the top of the stator winding are opposite to the magnetic poles at the bottom of the stator winding, the magnetic poles at one ends, facing the stator winding, of the adjacent permanent magnets on each circular turntable are opposite (namely, the magnetic poles at one ends, facing the stator winding, of any two adjacent permanent magnets on the circular turntable are N poles and S poles), and the magnetic poles at the top and the bottom of the stator winding are continuously changed so as to push the upper rotor and the lower rotor to oppositely. The contra-rotating dual-rotor brushless direct current motor needs to be matched with a corresponding BLDC controller for use.

Three Hall sensors are arranged on the annular bracket 6. The Hall sensors can be distributed at 120 degrees or 60 degrees along the circumferential direction of the annular support, the output of the Hall sensors is connected to the rotating speed controller, the rotating speed of the rotor is detected through the Hall sensors, and the Hall sensors are arranged to better control the rotation of the motor and enable the motor to rotate more stably; in some occasions with low requirements on stability, a Hall sensor can be omitted, and a corresponding Hall-free rotating speed controller is adopted to control the rotation of the motor.

The outer wall of the annular support 6 is provided with 24 mounting grooves 10 for mounting the stator winding 7 at equal intervals along the circumference, and the top and the bottom of the mounting grooves 10 are opened. Stator winding includes the column magnetic core and the coil of coiling on the magnetic core, and the opening at magnetic core top orientation mounting groove top, the opening of magnetic core bottom orientation mounting groove bottom.

Claims

1. A contra-rotating dual-rotor brushless direct current motor is characterized by comprising two rotors which are arranged in an up-down symmetrical mode, wherein a stator used for driving the two rotors to rotate in opposite directions relatively is arranged between the two rotors, a synchronizing mechanism is further arranged between the two rotors, the two rotors are connected through the synchronizing mechanism, and the synchronizing mechanism is used for enabling the two rotors to synchronously contra-rotate in opposite directions at the same speed.

2. A contra-rotating birotor brushless dc motor according to claim 1, wherein the synchronizing mechanism comprises two linkage gears (2) and at least one synchronizing gear (3), one linkage gear (2) is coaxially connected with the upper rotor, the other linkage gear (2) is coaxially connected with the lower rotor, the linkage gears (2) are sleeved on the longitudinal axis (1) arranged longitudinally through bearings, the synchronizing gear (3) is positioned between the two linkage gears (2) and engaged with the two linkage gears (2), and the synchronizing gear (3) is sleeved on the transverse axis (4) arranged transversely through bearings.

3. A contra-rotating, double rotor brushless dc motor according to claim 2, wherein the transverse axis (4) and the longitudinal axis (1) are perpendicular to each other, and the axis of the transverse axis (4) intersects the axis of the longitudinal axis (1).

4. A contra-rotating birotor brushless dc motor according to claim 2, wherein one end of the transverse shaft (4) is fixedly connected to the longitudinal shaft (1), and the other end of the transverse shaft (4) is fixedly connected to the stator.

5. A contra-rotating birotor brushless dc motor according to claim 2, characterized in that the linkage gear (2) and the synchronizing gear (3) are both conical gears.

6. A contra-rotating birotor brushless dc motor according to claim 1, wherein the stator is fixedly connected to the longitudinal shaft (1) by a connection mechanism, the connection mechanism comprises at least one transversely disposed connection shaft (5), one end of the connection shaft (5) is fixedly connected to the longitudinal shaft (1), and the other end of the connection shaft (5) is fixedly connected to the stator.

7. A contra-rotating birotor brushless dc motor according to claim 1, wherein the stator comprises an annular support (6) coaxial with the longitudinal axis (1), the outer wall of the annular support (6) is circumferentially provided with a plurality of stator windings (7), the stator windings (7) are longitudinally arranged, the rotor comprises a circular turntable (8) coaxial with the longitudinal axis (1), the outer edge of the circular turntable (8) is circumferentially provided with a plurality of permanent magnets (9), the adjacent permanent magnets (9) on each circular turntable (8) are opposite in magnetic pole towards one end of the stator windings (7), the permanent magnet (9) on the upper rotor is located above the top magnetic pole of the stator winding (7), and the permanent magnet (9) on the lower rotor is located below the bottom magnetic pole of the stator windings (7).

8. A contra-rotating birotor brushless DC motor according to claim 7, characterized in that the stator windings (7) are equally spaced along the outer wall of the ring-shaped support (6) and the permanent magnets (9) are equally spaced along the outer edge of the circular turntable (8).

9. A contra-rotating birotor brushless DC motor according to claim 7, characterized in that the outer wall of the ring-shaped bracket (6) is provided with a plurality of mounting grooves (10) along the circumference for mounting the stator windings (7), the mounting grooves (10) being open at the top and bottom.

10. A counter-rotating, dual-rotor brushless dc motor according to claim 1, wherein the axes of the two rotors are located on the same straight line.