CN-121984256-A - Evtol external rotor motor for aircraft

Abstract

The invention discloses an external rotor motor for eVTOL aircrafts, wherein a stator fixing shaft is arranged in the motor, a stator is arranged on the fixing shaft, a tooth yoke separation structure is adopted for the stator, a 3D printing integrated welding-free variable cross section flat wire winding is arranged in a groove, the groove fullness rate of the motor is increased, the motor efficiency is improved, a rotor is arranged outside the stator, a magnetic-gathering Halbach permanent magnet pole is arranged on the rotor, a shell and a front end cover and a rear end cover are arranged outside the rotor, one end of the fixing shaft is connected with a fairing through a fairing bearing, the fairing is fixedly connected with the front end cover, a blade is arranged outside the fairing, an airflow channel is arranged in the fairing, a plurality of spiral channels are formed in the stator, the airflow channel is communicated with the spiral channels, and when the motor is started, the blade and the shell simultaneously rotate and drive wind to enter the motor and flow out from the channels on the fixing shaft through the spiral channels. The stator spiral channel greatly increases the cooling area of the stator core, reduces the temperature rise of the stator of the outer rotor motor, and effectively relieves the problems of winding temperature and stator heat accumulation.

Inventors

• JU XIAOWEI
• Long Jiaxing
• LIU GUANGWEI
• XU ZHENYAO
• JIA GUANGLONG
• ZHOU JIALONG
• LI MINGYU
• WU HAO

Assignees

• 沈阳工业大学

Dates

Publication Date

20260505

Application Date

20260205

Claims (8)

1. 1. The outer rotor motor for eVTOL aircraft is characterized in that one end of the fixed shaft (8) is connected with a fairing (1) through a fairing bearing (17), the fairing (1) is externally provided with a fairing shell (22), the fairing shell (22) is fixedly connected with the shell, paddles (2) are arranged on the fairing shell (22), an airflow channel is arranged in the fairing shell (22), a plurality of spiral channels (6) are formed in the motor stator, the airflow channel is communicated with the spiral channels (6), the motor stator adopts a tooth yoke separating structure, and a variable cross-section flat wire winding (12) is wound on stator teeth of the motor stator.
2. 2. The external rotor motor for a eVTOL aircraft according to claim 1, wherein the motor stator includes a stator core (20), the stator core (20) is formed by axially laminating a plurality of silicon steel sheets, each silicon steel sheet is circumferentially staggered by an angle, and a plurality of spiral channels (6) are formed after lamination.
3. 3. The external rotor motor for eVTOL aircraft according to claim 2, wherein a stator yoke (16) is provided on the stator core (20), stator teeth (15) are clamped on the stator yoke (16), the stator teeth (15) and the stator yoke (16) adopt a separation structure, the section of the stator teeth (15) is in a T shape, a stator slot is formed between every two stator teeth (15), a variable cross section flat wire winding (12) is wound on the stator teeth (15), and a channel (11) is provided in the fixed shaft (8).
4. 4. The external rotor motor for eVTOL aircraft according to claim 3, wherein the conductor cross-sectional area of the variable cross-section flat wire winding (12) in the stator slot is unequal, the winding fills the stator slot space, and the variable cross-section flat wire winding (12) adopts a 3D printing integrated forming welding-free design and is led out through a channel (11) arranged on the fixed shaft (8).
5. 5. The external rotor motor for eVTOL aircraft according to claim 2, wherein one end of the stator core (20) is provided with a bushing pressing plate (3), the bushing pressing plate (3) is connected with the housing through a front bearing (9), a plurality of stator air inlets (19) are formed in the bushing pressing plate (3), and the stator air inlets (19) are communicated with the spiral channel (6).
6. 6. The external rotor motor for eVTOL aircraft according to claim 1, wherein a plurality of spiral plates (21) are arranged between the fairing (1) and the fairing housing (22), the plurality of spiral plates (21) are circumferentially arranged, an airflow channel is formed between the spiral plates (21), the airflow channel is a fairing spiral channel (18), and the rotation direction of the fairing spiral channel (18) is the same as the rotation direction of the blade (2), and the rotation direction of the fairing spiral channel (18) is opposite to the rotation direction of the spiral channel (6).
7. 7. The external rotor motor for the eVTOL aircraft according to claim 1, wherein the motor rotor includes a rotor core (13), the rotor core (13) is nested outside the motor stator and forms an air gap with the motor stator, the rotor core (13) and the housing are in interference fit, a plurality of permanent magnets (14) are arranged inside the rotor core (13), and Halbach arrangement structure is adopted between each permanent magnet (14).
8. 8. The external rotor motor for eVTOL aircraft according to claim 1, wherein the housing includes a front end cover (4), a rear end cover (7) and a motor casing (5), the front end cover (4) and the rear end cover (7) are both connected with the motor casing (5) by bolts, the inner side of the front end cover (4) is connected with the motor stator by a front bearing (9), the end part of the front end cover (4) is fixedly connected with a fairing housing (22), the rear end cover (7) is connected with a fixed shaft (8) by a rear bearing (10), and the motor casing (5) is arranged on the outer side of the motor rotor and is in interference fit with the motor rotor.

Description

Evtol external rotor motor for aircraft Technical Field The invention relates to the technical field of electric aircraft propulsion motor manufacturing, in particular to an outer rotor motor for eVTOL aircraft. Background In order to cope with global warming and promote sustainable development, "low-altitude economy" has become an important development focus, and low-altitude flight encompassed by low-altitude economy is mainly referred to as electric vertical takeoff and landing (ELECTRIC VERTICAL TAKE-off AND LANDING, eVTOL) aircraft, namely eVTOL aircraft. The core of the propulsion system of the eVTOL aircraft is a propulsion motor, and the propulsion motor determines the power performance and reliability of the aircraft. The propulsion motor is mainly divided into an inner rotor type motor and an outer rotor type motor, and in order to adapt to the complex operation condition of eVTOL aircraft, the power/torque density and reliability requirements of the propulsion motor are extremely high. At present, the outer rotor permanent magnet motor can reduce the high-temperature demagnetizing risk of the rotor permanent magnet by the good rotor heat dissipation capability, and more accords with the high-safety requirement of eVTOL, however, the high-power/torque density requirement of the propulsion motor necessarily requires larger electromagnetic load of the motor, so that the motor loss is increased, especially the alternating current loss of the flat wire winding is increased, the operation efficiency is reduced, and the more serious motor heating problem, especially the local heating problem of the stator winding of the outer rotor motor is generated, and the insulation safety of the motor is threatened. Disclosure of Invention In view of the shortcomings of the prior art, the invention aims to provide an external rotor motor for eVTOL aircraft, which adopts a high-density variable-section flat wire winding and stator integrated wind path structure and aims to solve the problems that an external rotor permanent magnet motor adopted by the prior aircraft has high torque density, electromagnetic load is increased, motor efficiency is reduced and stator windings heat. In order to achieve the above purpose, the invention adopts the following technical scheme: The outer rotor motor for eVTOL aircraft is characterized in that the middle part of the outer rotor motor is provided with a fixed shaft, a motor stator is arranged on the fixed shaft, a motor rotor is arranged outside the motor stator, a housing is arranged outside the motor rotor, one end of the fixed shaft is connected with a fairing through a fairing bearing, the fairing housing is fixedly connected with the housing, a blade is arranged on the fairing housing, an airflow channel is arranged in the fairing housing, a plurality of spiral channels are formed in the motor stator, the airflow channel is communicated with the spiral channels, the motor stator adopts a tooth yoke separation structure, and a variable cross-section flat wire winding is wound on stator teeth of the motor stator. Further, the motor stator comprises a stator core, the stator core is formed by axially laminating a plurality of silicon steel sheets, each silicon steel sheet is circumferentially staggered by an angle, and a plurality of spiral channels are formed after lamination. Further, a stator yoke is arranged on the stator core, stator teeth are clamped on the stator yoke, the stator teeth and the stator yoke adopt a separation structure, the section of each stator tooth is T-shaped, a stator groove is formed between every two stator teeth, a variable-section flat wire winding is wound on each stator tooth, and a channel is arranged in the fixed shaft. Further, the cross sections of conductors of the variable cross-section flat wire winding in the stator slot are unequal, the space of the stator slot is filled with the winding, the variable cross-section flat wire winding adopts a 3D printing integrated forming welding-free design, and the variable cross-section flat wire winding is led out through a channel arranged on the fixed shaft. Further, one end of the stator core is provided with a lining pressing plate, the lining pressing plate is connected with the shell through a front bearing, a plurality of stator air inlets are formed in the lining pressing plate, and the stator air inlets are communicated with the spiral channel. Further, a plurality of spiral plates are arranged between the fairing and the fairing shell, the plurality of spiral plates are circumferentially arranged, an airflow channel is formed between the spiral plates, the airflow channel is a fairing spiral channel, the rotation direction of the fairing spiral channel is the same as the rotation direction of the blade, and the rotation direction of the fairing spiral channel is opposite to the rotation direction of the spiral channel. Further, the motor rotor comprises a rotor core, the rotor core is n