CN205469814U - Motor and power unit with the motor, unmanned aerial vehicle - Google Patents

Abstract

The utility model provides a motor and have the power device and the unmanned vehicles of this motor. This motor includes mount pad, stator module, rotor subassembly, axis of rotation, antifriction bearing and sealing device. Be equipped with the accepting hole on this mount pad, this antifriction bearing accepts in this accepting hole. This antifriction bearing is connected with this rotor subassembly including the inner circle and the outer lane of coaxial setting, this axis of rotation, and one end inserts in this accepting hole and be connected with this antifriction bearing's inner circle, and this stator module fixes and is connected on this mount pad and with this antifriction bearing's outer lane. It has electrically conductive grease to fill in this accepting hole. This sealing device sets up in the opening part of this accepting hole for the grease that will electrically conduct most likely seals in this accepting hole. The utility model discloses a motor can reach the ages at a rate that the work that reduces the shaft current is used for reducing antifriction bearing through add the electrically conductive interior outer lane of grease in order to switch on this antifriction bearing on antifriction bearing, and the production that weakens electromagnetic interference simultaneously is in order to reduce the influence to the surrounding environment.

Description

Motor and power unit with the motor, unmanned aerial vehicle

technical field

The utility model relates to the field of aircraft, in particular to a motor, a power device with the motor, and an unmanned aircraft.

Background technique

UAVs fly mainly by receiving remote control signals, and transmit image signals through wireless transmission technology. During the flight of UAVs, signal interference, such as electromagnetic interference, will have a more obvious impact on sending and receiving wireless signals. For example, when the reception of remote control signals is interfered, it will affect the flight of UAVs. Accidents happen. When the transmission of the image signal is disturbed, it will affect the quality and speed of receiving the image signal at the receiving end. Therefore, reducing the electromagnetic interference of the UAV itself is a long-standing technical problem in this field that needs to be solved urgently.

For this reason, the inventor tries to study the technical problem of the electromagnetic interference of the unmanned aerial vehicle itself. At present, the power of unmanned aerial vehicles is realized in the form of motor-driven propellers. That is, by mounting the propeller on the motor, the rotation of the rotor of the motor is converted into thrust or lift for the propeller. During the inventor's implementation of the utility model, the utility model found that the motor sometimes generates relatively large electromagnetic interference during the flight of the unmanned aircraft, and the motor is generally located around the fuselage of the unmanned aircraft. The communication of the aircraft is greatly affected.

Utility model content

In view of this, it is necessary to propose a motor, a power device having the motor, and an unmanned aerial vehicle, so as to solve the problem of electromagnetic interference from the electric motor to the unmanned aerial vehicle.

A motor, comprising a mounting base, a stator assembly, a rotor assembly, a rotating shaft and a rolling bearing, the mounting base is provided with a receiving hole, and the rolling bearing is accommodated in the receiving hole; the rolling bearing includes a coaxial inner ring and outer ring, the rotating shaft is connected with the rotor assembly, one end of the rotating shaft is inserted into the receiving hole and connected with the inner ring of the rolling bearing, the stator assembly is fixed on the mounting seat and It is connected with the outer ring of the rolling bearing; the receiving hole is filled with conductive grease; the motor also includes a sealing device, and the sealing device is arranged at the opening of the receiving hole for sealing the conductive grease in the inside the receiving hole.

Further, the sealing device includes a sealing cover, and the sealing cover is arranged at the opening at one end of the receiving hole and close to the bottom of the mounting base.

Further, the sealing device further includes a sealing ring, and the sealing ring is sleeved on the sealing cover.

Further, the sealing device further includes a sealing element, the sealing element is arranged at the opening at the other end of the receiving hole and away from the bottom of the mounting seat.

Further, the rolling bearing further includes a plurality of rolling elements clamped radially between the inner ring and the outer ring, and the rolling elements are in a predetermined track between the inner ring and the outer ring scroll.

Further, the rolling body is one of balls, rollers and needles.

Further, the rolling bearing includes a first rolling bearing and a second rolling bearing, and the first rolling bearing and the second rolling bearing are coaxially arranged at both ends of the receiving hole.

Further, the other end of the rotating shaft is used to connect with a propeller, and the rotating shaft drives the propeller to rotate when the motor is working.

A power device, which is applied to unmanned aerial vehicles, includes the above-mentioned motor and a propeller installed at one end of the rotating shaft of the motor. The motor is used to drive the propeller to rotate to provide flight power for the UAV.

An unmanned aerial vehicle comprising:

a frame comprising a fuselage and arms attached to said fuselage; and

A power device installed at the free end of the arm, the power device includes the above-mentioned motor and a propeller installed at one end of the rotating shaft of the motor. The motor is used to drive the propeller to rotate to provide flight power for the UAV.

Further, the frame also includes a stand, which is used to protect the fuselage from impact during the landing process of the unmanned aerial vehicle and to support the unmanned aerial vehicle when it lands on a support surface. the fuselage.

Further, the unmanned aerial vehicle further includes a flight controller, and the flight controller is used to control the flight state of the unmanned aerial vehicle.

The motor of the utility model adds conductive grease to the rolling bearing to conduct the inner and outer rings of the rolling bearing, so as to reduce the axial current to reduce the aging speed of the rolling bearing, and at the same time weaken the generation of electromagnetic interference to reduce the impact on the surrounding environment , and low cost, high reliability.

Description of drawings

Fig. 1 is a three-dimensional exploded view of a power device of the present invention.

Fig. 2 is an enlarged perspective view of the structure of part II of the power plant in Fig. 1 .

Fig. 3 is a schematic side view of the power plant in Fig. 1 .

Fig. 4 is a cross-sectional view of the power plant in Fig. 3 along the direction IV-IV.

Fig. 5 is a perspective view of an unmanned aerial vehicle of the present invention.

Description of main component symbols

powerplant 100 motor 20 mount twenty one containment hole 211 stator assembly twenty two rotor assembly twenty three axis of rotation twenty four rolling bearing 25 first rolling bearing 25-1 Second rolling bearing 25-2 Inner circle 251 Outer ring 252 rolling element 253 Sealing means 26 sealing ring 261 sealing cap 262 Seals 263 propeller 30 Grease port P UAV 40 frame 41 body 411 Arm 412 tripod 413 Battery 42

The following specific embodiments will further illustrate the utility model in conjunction with the above-mentioned accompanying drawings.

detailed description

It should be noted that when a component is said to be "fixed" to another component, it can be directly on the other component or there can also be an intervening component. When a component is said to be "connected" to another component, it may be directly connected to the other component or there may be intervening components at the same time. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes of illustration only.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of this invention. The terminology used in the description of the utility model herein is only for the purpose of describing specific embodiments, and is not intended to limit the utility model. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

When the inventor was researching the technical problem of electromagnetic interference of the unmanned aerial vehicle itself, he found that the EMI generated on the unmanned aerial vehicle had a lot to do with the motor used, so he focused on testing the motor. During the test, the testers first check whether the cooperation between the ESC drive mode and the motor may cause EMI. By using different types of ESCs to drive motors that produce more obvious EMI, it is found that no matter which type of ESC is used to drive the motor, more obvious EMI will be generated, indicating that the generation of EMI has nothing to do with the ESC drive mode, and there is no ESC and motor. coordination problem. Secondly, the testers used a multimeter to measure the conduction between the stator and the rotor of the motor, and found that the rotor and stator of the motor with EMI in the normal range have been kept insulated, while the stator and rotor of the motor with EMI exceeding the standard are on and off. Therefore, it is suspected that the EMI is generated by the intermittent connection between the rotor and the stator after the motor rotates. By connecting the rotor and the stator of the motor with EMI exceeding the standard and then testing it, it was found that the test results were good many times. Therefore, it can be determined that the main factor for the EMI of the motor is: when the motor is running, the stator and rotor of the motor are turned on and off between the bearings during the rotation process, thereby generating pulse currents between the rotor and the stator.

The test results also show that no matter which way the motor is driven, there is a pulse current between the rotor and the stator. The principle of potential difference is that the pulsating magnetic field generated by the stator winding induces an electromotive force on the rotor, and there is no effective elimination method at present. Due to the potential difference between the rotor and the stator, a phenomenon of contact discharge will be formed, which is similar to the electromagnetic wave with a wide frequency band generated when the power connector is in electrical contact, thereby interfering with the normal operation of other equipment.

Since the EMI generated by the motor is caused by the intermittent connection between the rotor and the stator of the motor, there are two existing solutions: one is to use ceramic coating to reliably insulate the bearing from the rotor and stator of the motor; the other is to increase the current The brush conducts the inner and outer rings of the bearing to ensure reliable conduction between the rotor and the stator. Although these two methods can effectively eliminate the shaft current, they need to add more complicated processes and devices, and the increase of brushes reduces the reliability, and the ceramic coating is easily broken when it is impacted.

In addition, when the rolling bearing in the motor rolls, due to the electromagnetic induction of the motor, an alternating voltage is formed between the rotor and the stator, and lubricating oil is added to the rolling bearing. However, ordinary lubricating oil has poor electrical conductivity, resulting in a gap between the ball and the track. The thin oil film is frequently broken down to generate axial current discharge, thus leading to electrochemical aging of the track.

In order to solve the above-mentioned problems of electromagnetic interference caused by shaft current discharge of the motor and electrochemical aging of the track, the embodiment of the utility model provides a motor, including a mounting seat, a stator assembly, a rotor assembly, a rotating shaft and a rolling bearing. The mounting base is provided with a receiving hole, and the rolling bearing is accommodated in the receiving hole. The rolling bearing includes an inner ring and an outer ring arranged coaxially, the rotating shaft is connected to the rotor assembly, one end of the rotating shaft is inserted into the receiving hole and connected to the inner ring of the rolling bearing, the The stator assembly is fixed on the mounting seat and connected with the outer ring of the rolling bearing. The accommodating hole is filled with conductive grease. The motor also includes a sealing device, which is arranged at the opening of the receiving hole and is used to seal the conductive grease in the receiving hole.

The embodiment of the utility model also provides a power device, which is applied to an unmanned aerial vehicle. The power device includes the motor described in the above embodiment and a propeller installed at one end of the rotating shaft of the motor. The motor is used to drive the propeller to rotate to provide flight power for the UAV.

The embodiment of the utility model also provides an unmanned aerial vehicle, which includes a frame, the frame includes a fuselage and an arm connected to the fuselage; and a power device installed at the free end of the arm. The power device includes the motor described in the above embodiment and a propeller installed at one end of the rotating shaft of the motor. The motor is used to drive the propeller to rotate to provide flight power for the UAV.

Specifically, please refer to FIG. 1 , which is an exploded perspective view of a power device 100 of the present invention. In this embodiment, the power device 100 is applied in an unmanned aerial vehicle 40 (as shown in FIG. 5 ), and the power device 100 includes a motor 20 and a propeller 30 . Wherein, the propeller 30 is installed on the motor 20 , and the motor 20 is used to drive the propeller 30 to rotate so as to provide flight power for the UAV 40 .

Please refer to FIGS. 2-4 together. In this embodiment, the motor 20 includes a mounting base 21 , a stator assembly 22 , a rotor assembly 23 , a rotating shaft 24 and a rolling bearing 25 . Wherein, the stator assembly 22 is fixed on the mounting base 21 . The mounting base 21 is provided with a receiving hole 211 , and the rolling bearing 25 is received in the receiving hole 211 . The rotating shaft 24 is connected to the rotor assembly 23 , and one end of the rotating shaft 24 is inserted into the receiving hole 211 and can rotate in the receiving hole 211 . The rotor assembly 23 can rotate relative to the stator assembly 22 .

In this embodiment, the rolling bearing 25 includes an inner ring 251 and an outer ring 252 arranged coaxially. The inner ring 251 of the rolling bearing 25 is connected to one end of the rotating shaft 24 inserted into the receiving hole. The outer ring of the rolling bearing 25 is connected with the stator assembly 22 .

In this embodiment, the rolling bearing 25 further includes a plurality of rolling elements 253 radially clamped between the inner ring 251 and the outer ring 252 , and the rolling elements 253 can be positioned between the inner ring 251 and the outer ring 252 . The outer rings 252 roll on predetermined tracks (not shown). Wherein, the rolling elements 253 can be balls, rollers or needles.

In this embodiment, the rolling bearing 25 includes a first rolling bearing 25-1 and a second rolling bearing 25-2, and the first rolling bearing 25-1 and the second rolling bearing 25-2 are coaxially arranged in the housing the two ends of the hole 211.

In this embodiment, the receiving hole 211 is filled with conductive grease. Wherein, the conductive grease can be injected into the receiving hole 211 from the oil filling port P shown in FIG. 2 . In this embodiment, the conductive grease may include fluorocarbon oil as a base oil and graphite as a thickener. Wherein, the graphite is amorphous graphite. In other embodiments, the thickener may also include polytetrafluoroethylene.

Due to the good electrical conductivity of the conductive grease, the conductive grease is in contact with the inner ring 251 and the outer ring 252 of the rolling bearing 25 on the one hand, thereby conducting the electricity between the inner ring 251 and the outer ring 252. connection, and then conduct the electrical connection between the rotor assembly 23 and the stator assembly 22 through the inner ring 251 and the outer ring 252, so as to reduce the Electromagnetic interference caused by the potential difference between them.

On the other hand, the conductive grease enters the rolling bearing 25, so that the oil film between the rolling element 253 and the rolling track is not easy to be broken down, so as to avoid shaft current discharge, thereby effectively solving the electrochemical aging of the track question.

In this embodiment, the motor 20 further includes a sealing device 26 disposed at the opening of the receiving hole 211 for sealing the conductive grease in the receiving hole 211 .

In this embodiment, the sealing device 26 includes a sealing ring 261 and a sealing cover 262, the sealing ring 261 is sleeved on the sealing cover 262, and the sealing cover 262 is provided at the opening at one end of the receiving hole 211 and close to the bottom of the mount 21.

In this embodiment, the motor 20 is provided with a sealing device 26 at the opening of the receiving hole 211, which not only ensures the beautiful appearance of the motor 20, but also effectively prevents external dust from entering the receiving hole 211. The rotation friction force of the motor 20 caused by mixing with the conductive grease increases.

In this embodiment, the sealing device 26 further includes a sealing member 263, the sealing member 263 is arranged at the opening of the other end of the receiving hole 211 and away from the bottom of the mounting base 21, so as to further strengthen the The tightness between the two ends of the receiving hole 211.

Since the space between the two ends of the receiving hole 211 is closed by the sealing device 26 arranged at the two ends of the receiving hole 211, a sealed space is formed between the two ends of the receiving hole 211 to avoid filling the sealed space. The conductive grease in the motor 20 is squeezed out during the rotation of the motor 20, and the conductive grease is prevented from being exposed to the air for a long time to be air-dried.

In this embodiment, the other end of the rotating shaft 24 is used to connect with the propeller 30 , and the rotating shaft 24 drives the propeller 30 to rotate when the motor 20 is working.

In this embodiment, the motor 20 is applied in a power device of an unmanned aerial vehicle 40 . It can be understood that, in other embodiments, the motor 20 can also be applied in the traditional motor industry.

Further, as shown in FIG. 5 , the present invention also provides an unmanned aerial vehicle 40 , which at least includes a frame 41 , a power system (not shown in the figure) and a flight control system (not shown in the figure). Wherein, the power system and the flight control system are arranged on the frame 41 or inside the frame 41 .

The frame 41 at least includes a fuselage 411 , an arm 412 and a stand 413 . The fuselage 411 may also be called a center frame. In this embodiment, the arm 412 and the stand 413 are respectively connected to the fuselage 411 . In other embodiments, the machine arm 412 is connected to the fuselage 411 , and the tripod 413 is connected to the free end of the machine arm 412 . Wherein, the tripod 413 is used to protect the fuselage 411 from impact during the landing process of the UAV 40 and to support the fuselage 411 when the UAV 40 lands on a support surface.

The power system includes at least the power device 100 , an ESC (not shown in the figure), and a battery 42 . The power unit 100 is mounted on the free end of the arm 412 . The ESC is arranged in the fuselage 411 and is electrically connected with the flight controller. Under the control of the flight controller, the electric controller can adjust the rotation speed and rotation direction of the power unit 100 . Wherein, there may be multiple electric regulators, and one or more of the multiple electric regulators are respectively connected to the power device 100, and are used to adjust the rotation speed and rotation direction of the power device 100, so as to adjust The flight speed and flight attitude of the UAV 40. The battery 42 is used to provide working power for the UAV 40 .

The flight control system includes at least a flight controller (not shown) and a plurality of sensor modules (not shown). The flight controller is used to control the flight state of the UAV 40, including flight speed, flight attitude and so on. The sensor module is a component that can sense the measured information and transform the sensed information into electrical signals or other required forms of information output according to certain rules. The sensor module may include, but is not limited to, the inertial measurement unit, compass, GPS sensor, distance sensor, and the like. The inertial measurement unit is used to detect the attitude of the UAV 40 .

The motor of the utility model adds conductive grease to the rolling bearing to conduct the inner and outer rings of the rolling bearing, so as to reduce the axial current to reduce the aging speed of the rolling bearing, and at the same time weaken the generation of electromagnetic interference to reduce the impact on the surrounding environment , and low cost, high reliability. When applied to an unmanned aerial vehicle, it can effectively avoid interference to the unmanned aerial vehicle to send and receive wireless signals, and improve the flying safety of the unmanned aerial vehicle and the speed of transmitting wireless signals.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model without limitation. Although the utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the utility model can be Modifications or equivalent replacements shall be made to the technical solutions without departing from the spirit and scope of the technical solutions of the present utility model.

The disclosure of this patent document contains material that is protected by copyright. This copyright belongs to the copyright owner. The copyright owner has no objection to the reproduction by anyone of the patent document or the patent disclosure as it exists in the official records and files of the Patent and Trademark Office.

Claims (12)

1. a motor, including mounting seat, stator module, rotor assembly, rotary shaft and rolling bearing, described mounting seat is provided with accepting hole, and described rolling bearing is contained in described accepting hole；Described rolling bearing includes the inner ring and outer ring being coaxially disposed, described rotary shaft is connected with described rotor assembly, one end of described rotary shaft is inserted in described accepting hole and is connected with the inner ring of described rolling bearing, and described stator module is fixed in described mounting seat and is connected with the outer ring of described rolling bearing；Described accepting hole is filled with conduction oils and fats；Described motor also includes that sealing device, described sealing device are arranged at the opening part of described accepting hole, for being sealed in described accepting hole by described conduction oils and fats.

2. motor as claimed in claim 1, it is characterised in that: described sealing device includes sealing lid, and described sealing is covered on the opening part of described accepting hole one end and near the bottom of described mounting seat.

3. motor as claimed in claim 1, it is characterised in that: described sealing device also includes that sealing ring, described sealing ring are sheathed on described sealing and cover.

4. motor as claimed in claim 2, it is characterised in that: described sealing device also includes that sealing member, described sealing member are located at the opening part of the described accepting hole other end and away from the bottom of described mounting seat.

5. motor as claimed in claim 1, it is characterised in that: described rolling bearing also includes the multiple rolling elements being radially clamped between described inner ring and described outer ring, rolls in described rolling element planned orbit between described inner ring and described outer ring.

6. motor as claimed in claim 5, it is characterised in that: described rolling element is the one in ball, roller, needle roller.

7. the motor as described in claim 5 or 6, it is characterised in that: described rolling bearing includes that the first rolling bearing and the second rolling bearing, described first rolling bearing and described second rolling bearing are coaxially disposed within the two ends of described accepting hole.

8. motor as claimed in claim 1, it is characterised in that: the other end of described rotary shaft is for being connected with a propeller, and described rotary shaft drives described propeller rotational when described motor works.

9. power set, are applied in unmanned vehicle, and described power set include:

Motor described in claim 1-8 any one；And

Being installed on the propeller of one end of the rotary shaft of described motor, described motor is used for driving described propeller rotational, to provide flying power to described unmanned vehicle.

10. a unmanned vehicle, including:

Frame, including fuselage and the horn that is connected with described fuselage；And

Being installed on the power set of the free end of described horn, described power set include:

Motor described in claim 1-8 any one；And

Being installed on the propeller of one end of the rotary shaft of described motor, described motor is used for driving described propeller rotational, to provide flying power to described unmanned vehicle.

11. unmanned vehicles as claimed in claim 10; it is characterized in that: described frame also includes foot rest, described foot rest is for protecting described fuselage not clashed into and supporting described fuselage when described unmanned vehicle lands in a supporting surface in the landing mission of described unmanned vehicle.

12. unmanned vehicles as claimed in claim 10, it is characterised in that: described unmanned vehicle also includes flight controller, and described flight controller is for controlling the state of flight of described unmanned vehicle.