CN110601400A - Oil immersion type integrated permanent magnet brushless direct current motor - Google Patents
Oil immersion type integrated permanent magnet brushless direct current motor Download PDFInfo
- Publication number
- CN110601400A CN110601400A CN201910885940.6A CN201910885940A CN110601400A CN 110601400 A CN110601400 A CN 110601400A CN 201910885940 A CN201910885940 A CN 201910885940A CN 110601400 A CN110601400 A CN 110601400A
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- CN
- China
- Prior art keywords
- rotor
- stator
- oil
- permanent magnet
- direct current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
- H02K1/165—Shape, form or location of the slots
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/28—Layout of windings or of connections between windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/161—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at both ends of the rotor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
- H02K5/225—Terminal boxes or connection arrangements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K9/197—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
- H02P6/18—Circuit arrangements for detecting position without separate position detecting elements
Abstract
The invention discloses an oil-immersed integrated permanent magnet brushless direct current motor, which comprises a stator, a rotor, a shell, an end cover, a controller and an outer cover, wherein the rotor is arranged on the stator; the stator comprises an iron core with a tooth slot and a three-phase winding, the three-phase winding is embedded in the iron core slot and is sealed and protected by epoxy pouring sealant; the rotor comprises a rotating shaft, a rotor iron core, an end ring, magnetic steel and a sheath, wherein the rotor iron core is sleeved on the motor shaft, the magnetic steel is bonded on the outer circumferential surface of the rotor iron core, and the sheath is sleeved outside the magnetic steel; the rotor is arranged in the stator, and a certain working gap is reserved between the rotor and the stator; the shell is assembled outside the stator, and one end of the shell is provided with a graphite bearing. The invention adopts integrated design and no position sensor drive control, has simple structure, small volume and high reliability, and has the working life of more than 8000 h.
Description
Technical Field
The invention belongs to the technical field of motors, and particularly relates to an oil-immersed integrated permanent magnet brushless direct current 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.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an oil-immersed integrated permanent magnet brushless direct current motor.
The technical scheme of the invention is as follows:
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.
By adopting the technical scheme of the invention, the invention has the following beneficial effects:
(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 profile of the present invention;
FIG. 3 is a cross-sectional view of a rotor of the present invention;
fig. 4 is a cross-sectional view a-a of a cross-sectional view of a 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 invention is further described below with reference to the following figures and specific examples.
Referring to fig. 1 to 4, the invention provides an oil-immersed integrated permanent magnet brushless dc motor, which comprises a stator 1, a rotor 2, a housing 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 working principle of the invention is as follows:
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 description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. The utility model provides an immersion oil formula integration permanent magnetism brushless DC motor which characterized in that: the motor 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) and is in interference fit, and a graphite bearing I (11) is arranged 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 in the center of the end cover and matched with the graphite bearing I (11) 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); the oil circulation structure is characterized in that 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 I (11) and the graphite bearing II (12) to jointly form a circulation oil path.
2. The oil-immersed integrated permanent magnet brushless direct current motor according to claim 1, characterized in that: 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 winding of the stator (1) is electrically connected with a controller (5) through a connecting terminal (7).
3. The oil-immersed integrated permanent magnet brushless direct current motor according to claim 2, characterized in that: 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.
4. The oil-immersed integrated permanent magnet brushless direct current motor according to claim 1, characterized in that: 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, and a thrust disc is further machined on the rotating shaft (14) to provide radial constraint and axial constraint for the rotor (2) and ensure that the rotor (2) rotates stably at a high speed; the first end ring (15) and the second end ring (19) are made of nonmagnetic stainless steel, axial positioning is provided for the rotor core (16) and the magnetic steel (17), and holes can be drilled on the axial positioning to remove weight, so that dynamic balance detection of the rotor (2) is realized; 4 bosses are uniformly distributed on the outer circumference of the rotor core (16), so that the magnetic steel (17) is 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 (17) from being damaged by collision or corrosion of oil.
5. The oil-immersed integrated permanent magnet brushless direct current motor according to claim 4, characterized in that: and a rotor sheath (18) of the rotor (2) and the end rings (15) and (19) at the two ends are welded and sealed by argon arc welding.
6. The oil-immersed integrated permanent magnet brushless direct current motor according to claim 1, characterized in that: the wiring terminal (7) adopts three single-core glass sintered insulators and is fixed and sealed in a welding mode.
7. The oil-immersed integrated permanent magnet brushless direct current motor according to claim 1, characterized in that: and a power device of the controller (5) is attached to the outer side of the end cover (4).
8. The oil-immersed integrated permanent magnet brushless direct current motor according to claim 1, characterized in that: seal through O type sealing washer (9) between casing (3) and end cover (4), seal through O type sealing washer two (10) between casing (3) and dustcoat (6) for prevent that fluid from revealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910885940.6A CN110601400A (en) | 2019-09-18 | 2019-09-18 | Oil immersion type integrated permanent magnet brushless direct current motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910885940.6A CN110601400A (en) | 2019-09-18 | 2019-09-18 | Oil immersion type integrated permanent magnet brushless direct current motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110601400A true CN110601400A (en) | 2019-12-20 |
Family
ID=68860993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910885940.6A Pending CN110601400A (en) | 2019-09-18 | 2019-09-18 | Oil immersion type integrated permanent magnet brushless direct current motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110601400A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111600418A (en) * | 2020-05-19 | 2020-08-28 | 杨帅军 | Series excited motor |
| CN113417878A (en) * | 2021-08-03 | 2021-09-21 | 烟台东德实业有限公司 | Stator-encapsulated hydrogen circulating pump and manufacturing method thereof |
| CN113890298A (en) * | 2021-09-22 | 2022-01-04 | 苏州洛塔电机有限公司 | Double-torque brushless motor |
-
2019
- 2019-09-18 CN CN201910885940.6A patent/CN110601400A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111600418A (en) * | 2020-05-19 | 2020-08-28 | 杨帅军 | Series excited motor |
| CN111600418B (en) * | 2020-05-19 | 2022-09-09 | 珠海天骋科技有限公司 | Series excited motor |
| CN113417878A (en) * | 2021-08-03 | 2021-09-21 | 烟台东德实业有限公司 | Stator-encapsulated hydrogen circulating pump and manufacturing method thereof |
| CN113890298A (en) * | 2021-09-22 | 2022-01-04 | 苏州洛塔电机有限公司 | Double-torque brushless motor |
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