CN210431048U

CN210431048U - Oil immersion type integrated permanent magnet brushless direct current motor

Info

Publication number: CN210431048U
Application number: CN201921577308.7U
Authority: CN
Inventors: 申志刚; 林文泉; 易宇; 杜玉洁
Original assignee: Shenzhen Quansheng Precision Technology Co ltd
Current assignee: Shenzhen Quansheng Precision Technology Co ltd
Priority date: 2019-09-18
Filing date: 2019-09-18
Publication date: 2020-04-28
Anticipated expiration: 2029-09-18

Abstract

The utility model discloses the utility model provides an oil-immersed integrated permanent magnet brushless DC motor, which comprises a stator, a rotor, a casing, an end cover, a controller and an outer cover; the stator comprises a slotted iron core and three-phase windings , the three-phase winding is embedded in the iron core slot, and sealed and protected with epoxy potting compound; the rotor includes the rotating shaft, the rotor iron core, the end ring, the magnetic steel and the sheath, the rotor iron core is sleeved on the motor shaft, and the magnetic steel It is bonded to the outer circumferential surface of the rotor iron core, and the outer magnet steel is sheathed with a sheath; the rotor is installed inside the stator, leaving a certain working gap between them; the shell is assembled outside the stator, and one end is equipped with a graphite bearing. The utility model adopts an integrated design, no position sensor drive control, simple structure, small volume, high reliability, and a working life of more than 8000h.

Description

Oil immersion type integrated permanent magnet brushless direct current motor

Technical Field

The utility model belongs to the technical field of the motor, concretely relates to immersion oil formula integration permanent magnetism brushless DC motor.

Background

The permanent magnet brushless DC motor is an electromechanical capacity conversion device which adopts permanent magnet excitation and electronic commutation to replace mechanical commutation. The high-speed direct-current motor has the advantages of simple structure, reliable operation, convenient maintenance, long operation life and the like, has good speed regulation performance, flexible and changeable control method, high efficiency, large starting torque, strong overload capacity, no reversing spark, no radio interference, no excitation loss and the like, is in line with the pursuit of industrial upgrading on weight reduction, reliability improvement, performance improvement or life cost reduction, is mature in application in many fields, and is particularly suitable for the aviation field with special requirements on performance, volume and weight.

In the aviation field, a permanent magnet brushless direct current motor is used as a fuel delivery pump driving part of an aircraft engine or an auxiliary power system and is immersed in a fuel tank. The traditional oil immersion motor usually adopts a common brush permanent magnet direct current motor, when the motor runs, an electric brush and a commutator rub at a high speed, commutation spark and noise are easily generated, if the control is not good, the working performance of the motor is directly influenced, and the commutator and the electric brush are damaged in serious cases, so that the motor cannot work normally, and the flight performance and safety of an aircraft are seriously influenced. In addition, because the brush and the commutator of the brushed permanent magnet direct current motor can be abraded during operation, the service life of the brushed permanent magnet direct current motor is short, generally about 2000-3000 h, and therefore high operation and maintenance cost is brought.

SUMMERY OF THE UTILITY MODEL

To the problem that prior art exists, the utility model provides an immersion oil formula integration permanent magnetism brushless DC motor.

The technical scheme of the utility model is that:

an oil-immersed integrated permanent magnet brushless direct current motor comprises a stator, a rotor, a shell, an end cover, a controller and an outer cover, wherein the rotor is sleeved in the stator; the shell is assembled outside the stator and is in interference fit, and a graphite bearing I is arranged at one end of the shell; the end cover is arranged at the other end of the shell, the center of the end cover is provided with a graphite bearing II, and the graphite bearing II is matched with the graphite bearing I on the shell to jointly support the rotor; the end cover is also provided with a wiring terminal for connecting the stator and the controller; the controller is arranged outside the end cover and adopts a position-sensorless driving control mode; the outer cover is arranged outside the controller and is sleeved at one end of the shell; the outer circumferential surface of the stator is provided with an inclined stator oil passing groove, the rotating shaft of the rotor is provided with a central through hole, the end cover is provided with a cavity and an inclined hole, and the graphite bearing I and the graphite bearing II are also provided with oil passing grooves to jointly form a circulating oil path. Preferably, the motor is mounted entirely vertically on the carrier, i.e. keeping the stator 1 and the rotor 2 working along axes perpendicular to the plane of the carrier.

Preferably, the stator comprises an iron core and a three-phase winding, and the three-phase winding is embedded in the iron core and is sealed and protected by epoxy potting adhesive; the three-phase windings of the stator are electrically connected to the controller 5 via connection terminals.

Preferably, the iron core is provided with a tooth space, and the tooth space is designed to be a skewed slot structure so as to reduce torque fluctuation caused by a tooth space effect.

Preferably, the rotor comprises a rotating shaft, a first end ring, a rotor core, magnetic steel, a rotor sheath and a second end ring, an axial circular through hole is machined in the center of the rotating shaft to form a circulating oil path channel, and a thrust disc is further machined on the rotating shaft to provide radial constraint and axial constraint for the rotor and ensure high-speed and stable rotation of the rotor; the first end ring and the second end ring are made of nonmagnetic stainless steel, axial positioning is provided for the rotor core and the magnetic steel, and holes can be drilled on the end rings for removing weight, so that dynamic balance detection of the rotor 2 is realized; the bosses are uniformly distributed on the outer circumference of the rotor core, so that the magnetic steel can be conveniently positioned and installed; the rotor sheath is made of nonmagnetic stainless steel, is sleeved outside the magnetic steel and is welded and sealed with the first end ring and the second end ring, and the magnetic steel is protected from being damaged by collision or corrosion of oil.

Preferably, the rotor sheath of the rotor and the end ring I and the end ring II at two ends are welded and sealed by argon arc welding.

Preferably, the connecting terminal adopts three single-core glass sintered insulators and is fixed and sealed in a welding mode.

Preferably, the power device of the controller is attached to the outer side of the end cover.

Preferably, the shell and the end cover are sealed through a first O-shaped sealing ring, and the shell and the outer cover are sealed through a second O-shaped sealing ring to prevent oil leakage.

Adopt the technical scheme of the utility model, following beneficial effect has:

(1) the permanent magnet brushless direct current motor is adopted, so that the influence of spark and abrasion caused by the friction between the brush of the common brush permanent magnet direct current motor and the commutator is avoided, the working reliability is improved, and the service life is prolonged;

(2) the permanent magnet brushless direct current motor adopts a position-sensorless driving control mode, a rotor position sensor is omitted, the structural design is simplified, and the weight and the manufacturing cost of the whole machine are reduced;

(3) the reasonable oil path design is adopted, so that a plurality of oil paths are formed in the motor to flow circularly, the heat dissipation capacity of the motor stator, the motor rotor and the controller is improved, and the environment adaptability of the motor is enhanced;

(4) the controller is installed at motor casing rear end, forms the integrated design with motor body, further reduces the holistic volume of motor and weight.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a view of the stator of the present invention;

FIG. 3 is a cross-sectional view of the rotor of the present invention;

fig. 4 is a sectional view a-a of the rotor of the present invention.

The attached drawings are marked as follows:

1-a stator; 2-a rotor; 3, a shell; 4, end cover; 5, a controller; 6, covering the outer cover; 7, a connecting terminal; 8-controller power device; 9-O type sealing ring I; 10-O type seal ring two; 11-a graphite bearing I; 12-a graphite bearing II; 13-stator oil-passing groove; 14-a rotating shaft; 15-end ring one; 16-rotor core; 17-magnetic steel; 18-rotor sheath; 19-end ring two.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 4, the utility model provides an oil immersion type integrated permanent magnet brushless dc motor, which comprises a stator 1, a rotor 2, a shell 3, an end cover 4, a controller 5 and an outer cover 6, wherein the rotor 2 is sleeved in the stator 1; the shell 3 is assembled outside the stator 1, interference fit is achieved between the shell 3 and the stator 1, and a graphite bearing I11 is installed at one end of the shell 3; the end cover 4 is arranged at the other end of the shell 3, a graphite bearing II 12 is arranged at the center of the end cover and matched with a graphite bearing I11 on the shell 3 to jointly support the rotor 2; the end cover 4 is also provided with a wiring terminal 7 for connecting the stator 1 and the controller 5; the controller 5 is arranged outside the end cover 4 and adopts a position-sensorless driving control mode; the outer cover 6 is arranged outside the controller 5 and is sleeved at one end of the shell 3; an inclined stator oil passing groove 13 is formed in the outer circumferential surface of the stator 1, a central through hole is formed in the rotating shaft of the rotor 2, a cavity and an inclined hole are formed in the end cover 4, and oil passing grooves are also formed in the graphite bearing I11 and the graphite bearing II 12 to jointly form a circulating oil path.

The stator 1 comprises an iron core and a three-phase winding, wherein the three-phase winding is embedded in the iron core and is sealed and protected by epoxy pouring sealant; the three-phase windings of the stator 1 are electrically connected to a controller 5 via terminals 7.

The iron core is provided with a tooth space which is designed into a skewed slot structure so as to reduce torque fluctuation caused by the tooth space effect.

The rotor 2 comprises a rotating shaft 14, a first end ring 15, a rotor iron core 16, magnetic steel 17, a rotor sheath 18 and a second end ring 19, an axial circular through hole is machined in the center of the rotating shaft 14 to form a circulating oil path channel, a thrust disc is further machined on the rotating shaft 14 to provide radial constraint and axial constraint for the rotor 2, and the rotor 2 is guaranteed to rotate stably at a high speed; the first end ring 15 and the second end ring 19 are made of nonmagnetic stainless steel, provide axial positioning for the rotor core 16 and the magnetic steel 17, and can be drilled to remove weight on the end rings so as to realize dynamic balance detection of the rotor 2; 4 bosses are uniformly distributed on the outer circumference of the rotor core 16, so that the magnetic steel 17 can be conveniently positioned and installed; the rotor sheath 18 is made of nonmagnetic stainless steel, is sleeved outside the magnetic steel 17, and is welded and sealed with the first end ring 15 and the second end ring 19 to protect the magnetic steel from being damaged by collision or corrosion of oil.

And a rotor sheath 18 of the rotor 2 is welded and sealed with the end ring I15 and the end ring 19 at two ends by argon arc welding.

The wiring terminal 7 adopts three single-core glass sintered insulators and is fixed and sealed in a welding mode.

And the power device of the controller 5 is attached to the outer side of the end cover 4.

The oil leakage prevention device is characterized in that the shell 3 and the end cover 4 are sealed through a first O-shaped sealing ring 9, and the shell 3 and the outer cover 6 are sealed through a second O-shaped sealing ring 10 to prevent oil leakage.

The utility model discloses the theory of operation does:

the controller 5 is connected with the three-phase winding of the stator 2 through the wiring terminal 7, the work of the controller adopts a position-sensorless driving control mode, the position of the rotor is judged by collecting back electromotive force signals of the three-phase winding of the stator 1, the electrifying sequence and direction of the three-phase winding are controlled, and the motor is driven to rotate at a high speed.

When the motor works, the rotor 2 drives the pump impeller to rotate at a high speed, part of oil enters the inner cavity of the motor from the semicircular groove of the graphite bearing 12 at the bottom end under the action of pressure, part of the oil flows to the rear end of the motor from a gap between the stator 1 and the rotor 2, and part of the oil flows to the rear end of the motor from the oil through groove 13 on the outer circumference of the stator 1. The oil liquid flows into the cavity of the end cover 4 through the semicircular groove of the top end graphite bearing 11 and the inclined hole on the end cover 4, and then flows out of the motor through the central hole of the rotating shaft 14 on the rotor 2, a plurality of circulating oil paths are formed in the motor, so that heat generated by the motor stator 1, the rotor 2 and the controller power device 8 during working can be taken away in time, and the motor has better heat dissipation capability.

The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.

Claims

1. An oil-immersed integrated permanent magnet brushless DC motor, characterized in that: comprising a stator (1), a rotor (2), a casing (3), an end cover (4), a controller (5) and an outer cover (6), the rotor (2) is sheathed in the stator (1); the casing (3) is assembled outside the stator (1) with an interference fit, and one end of the casing (3) is equipped with graphite Bearing one (11); the end cover (4) is installed on the other end of the casing (3), and a graphite bearing two (12) is installed in the center, which cooperates with the graphite bearing one (11) on the casing (3), The rotor (2) is jointly supported; the end cover (4) is also provided with a terminal (7) for connecting the stator (1) and the controller (5); the controller (5) is installed on the end cover ( 4) External and a position sensorless drive control method is adopted; the outer cover (6) is installed outside the controller (5), and is sleeved on one end of the casing (3); the outer circumferential surface of the stator (1) is machined with an inclined stator The oil passage (13), the shaft of the rotor (2) is machined with a central through hole, the end cover (4) is provided with a cavity and an inclined hole, and the graphite bearing one (11) and the graphite bearing two (12) are also machined with oil passages. , together to form a circulating oil circuit.

2. The oil-immersed integrated permanent magnet brushless DC motor according to claim 1, wherein the stator (1) comprises an iron core and a three-phase winding, and the three-phase winding is embedded in the iron core, And epoxy potting glue is used for sealing protection; the three-phase winding of the stator (1) is electrically connected with the controller (5) through the connection terminal (7).

3. The oil-immersed integrated permanent magnet brushless DC motor according to claim 2, wherein the iron core is provided with cogging, and the cogging is designed as an oblique groove structure, so as to reduce the impact caused by the cogging Torque ripple caused by the effect.

4. The oil-immersed integrated permanent magnet brushless DC motor according to claim 1, wherein the rotor (2) comprises a rotating shaft (14), an end ring (15), a rotor core (16) , magnetic steel (17), rotor sheath (18) and end ring two (19), the center of the rotating shaft 14 is machined with an axial circular through hole to form a circulating oil channel, and the rotating shaft (14) is also machined with The thrust plate provides radial and axial constraints for the rotor (2) to ensure the rotor (2) rotates smoothly at high speed; the first end ring (15) and the second end ring (19) are made of non-magnetic stainless steel and are The rotor iron core (16) and the magnetic steel (17) provide axial positioning, and drill holes can be drilled on them to remove weights, so as to realize the dynamic balance detection of the rotor (2); the outer circumference of the rotor iron core (16) is uniform Four bosses are distributed to facilitate the positioning and installation of the magnetic steel (17). The second end ring (19) is welded and sealed to protect the magnetic steel (17) from damage due to bumping or corrosion by oil.

5. The oil-immersed integrated permanent magnet brushless DC motor according to claim 4, characterized in that: the rotor sheath (18) of the rotor (2) and the end ring one (15) at both ends and the end ring Two (19) are welded and sealed by argon arc welding.

6 . The oil-immersed integrated permanent magnet brushless DC motor according to claim 1 , wherein the connection terminal ( 7 ) adopts three single-core glass sintered insulators, which are fixed and sealed by welding. 7 .

7 . The oil-immersed integrated permanent magnet brushless DC motor according to claim 1 , characterized in that: the power device of the controller ( 5 ) is fitted and installed on the outside of the end cover ( 4 ). 8 .

8. The oil-immersed integrated permanent magnet brushless DC motor according to claim 1, characterized in that: an O-ring seal (9) is used between the casing (3) and the end cover (4). Sealing, the housing (3) and the outer cover (6) are sealed by an O-ring two (10), which is used to prevent oil leakage.