CN109347290B - Oil rig carousel that combination formula PMSM directly drives - Google Patents
Oil rig carousel that combination formula PMSM directly drives Download PDFInfo
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- CN109347290B CN109347290B CN201811277884.XA CN201811277884A CN109347290B CN 109347290 B CN109347290 B CN 109347290B CN 201811277884 A CN201811277884 A CN 201811277884A CN 109347290 B CN109347290 B CN 109347290B
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- Prior art keywords
- iron core
- rotary drum
- magnetic steel
- shell frame
- oil
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/02—Details
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B3/00—Rotary drilling
- E21B3/02—Surface drives for rotary drilling
- E21B3/04—Rotary tables
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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
-
- 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
- H02K1/2713—Inner rotors the magnetisation axis of the magnets being axial, e.g. claw-pole type
-
- 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
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- 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
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- 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
- H02K5/163—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at only one end of the rotor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The invention discloses a combined type permanent magnet synchronous motor direct-drive oil rig turntable, which comprises a shell frame, a stator, a rotor, square cores, square tiles and a rig rotating shaft, wherein the stator is arranged on the shell frame; the stator comprises a first iron core, a second iron core and a winding coil wound on the first iron core and the second iron core, wherein the first iron core is in an arc thick tile shape, and the second iron core is in a fan shape and is positioned below the first iron core; the rotor comprises a rotary drum, first magnetic steel substrates and second magnetic steel substrates, wherein the first magnetic steel substrates are arc Bao Wa sheets and are attached to the side wall of the upper part of the rotary drum, the second magnetic steel substrates are fan-shaped sheets and are attached to the step surface of the middle part of the rotary drum, and each iron core and each magnetic steel substrate can be independently detached and controlled; the shell frame is connected with the rotary drum through a main bearing and an auxiliary bearing which are arranged up and down. The structure of the turntable can be used for randomly disassembling and replacing damaged iron cores and magnetic steel substrates, and is high in safety performance, convenient to maintain, low in maintenance cost, stronger in motor power, quicker in response and higher in precision.
Description
Technical Field
The invention belongs to the field of oil drilling equipment, and particularly relates to a combined permanent magnet synchronous motor direct-drive oil drilling machine turntable.
Background
The traditional oil rig turntable is driven by a power device (a diesel engine or hydraulic or electric motor), then the speed reducer is driven by a speed reducer to drive an angle transmission speed reducer, and the angle speed reducer is used for driving a drill rod so as to realize ground drilling. The turntable is decelerated several times and is inefficient. The gear reducer needs to be frequently replaced with lubricating oil, so that the maintenance workload is large and the maintenance cost is high. Particularly, a large number of gears need to be processed in the manufacturing process, the processing is difficult, and the occupied area is large, so that the arrangement of drilling machine equipment is difficult.
In the prior art, for example, a patent 'electromechanical integrated petroleum drilling machine turntable' with a patent number of 200910073790.5 adopts a permanent magnet synchronous motor to directly drive a drill rod, but has the defects in power and slow response; the coil of the stator generates excessive heat after being electrified, and a large amount of heat is generated during long-time operation among all parts, so that great loss is generated on the parts.
Disclosure of Invention
The invention provides a combined permanent magnet synchronous motor direct-drive oil drilling machine turntable, which is realized by the following technical scheme, in order to improve the response speed and power of an oil drilling machine drilling plate, reduce the loss of parts caused by coil energization and heating of other parts running for a long time as soon as possible, and improve the service life of equipment.
The rotary table comprises a shell frame, a stator, a rotor, square cores, square tiles and a rotary shaft of the drilling machine, wherein the shell frame surrounds and is fixed outside the stator;
the stator comprises a first iron core, a second iron core and winding coils wound on the first iron core and the second iron core, wherein the first iron core is in an arc thick tile shape, a plurality of first iron cores are combined to form a circular-like tubular structure, the second iron cores are in a fan-shaped sheet shape and are positioned below the first iron cores, and each of the first iron core and the second iron core can be independently detached and independently controlled; winding coils on each first iron core and each second iron core are connected in parallel;
the rotor comprises a rotary drum, a first magnetic steel substrate and a second magnetic steel substrate, wherein the upper part of the rotary drum is thick, the lower part of the rotary drum is thin, a plurality of first magnetic steel substrates are arc Bao Wa sheets and are attached to the side wall of the upper part of the rotary drum, a plurality of second magnetic steel substrates are fan-shaped sheets and are attached to the step surface of the middle part of the rotary drum, and each first magnetic steel substrate and each second magnetic steel substrate can be independently detached and independently controlled and respectively correspond to winding coils of the first iron core and the second iron core;
the lower part of the shell frame is connected with the rotary drum through a main bearing; the square bushing is fixed in the square bushing, and the drilling machine rotating shaft is fixed in the square bushing.
On the oil rig turntable, when the oil rig turntable rotates, the winding coils of the first iron core and the second iron core generate current, magnetic force is generated under the action of the magnetic steel substrate of the rotor, and the rotor starts to rotate relative to the stator according to the acting force and the reacting force principle. When any one of the first iron cores and the first magnetic steel substrates, or any one of the second iron cores and the second magnetic steel substrates are damaged, the parallel connection mode is adopted, so that no influence is exerted on other intact winding coils, the whole turntable can still drive the drill bit to rotate, and the damaged iron cores and the damaged magnetic steel substrates can be detached at will. The mode of directly driving the drill bit by the permanent magnet synchronous motor with the two groups of iron cores and winding coils has the advantages of high safety performance, convenience in maintenance, low maintenance cost, stronger power, higher precision and faster response.
Preferably, a secondary bearing is further arranged below the main bearing. The auxiliary bearing can share the gravity of the shell frame to the rotary drum.
More preferably, the main bearing is inclined vertically inwards, and the bearing direction of the auxiliary bearing is inclined vertically outwards. At this time, the main bearing and the auxiliary bearing can bear the weight of the rotary drum in the vertical direction, and simultaneously can generate mutual clamping force in the horizontal direction, so that the rotary drum and the shell frame are more stable, and the rotary drum is prevented from shaking left and right in the shell frame.
Preferably, a cooling and lubricating system is arranged on the oil rig turntable. When the winding coil of the stator is electrified for a long time, a large amount of heat is generated, and when the main bearing and the auxiliary bearing rotate for a long time, the main bearing and the auxiliary bearing are easy to rub to generate a large amount of heat, so that the abrasion and the aging of parts are accelerated, a cooling and lubricating system for the whole turntable is required to be arranged, the temperature of the whole turntable is reduced, and the abrasion of the main bearing and the auxiliary bearing is reduced.
Preferably, the lower part of the shell frame is rolled up inwards to be U-shaped, and the tail end of the rolled shell frame and the side wall of the bottom of the rotary drum are overlapped together with a gap left between the tail end of the rolled shell frame and the side wall of the bottom of the rotary drum. After being rolled up inwards below the shell frame, the tail end of the shell frame is rolled up and lifted to be in a vertical state and corresponds to the bottom side wall of the rotary drum.
Further preferably, a portion of the rolled housing frame end overlapping the drum bottom side wall is provided with sealing rubber.
Still further preferably, the cooling and lubrication system is specifically: the shell frame is made of heat-conducting metal, the main bearing and the second iron core are separated by an annular partition plate, a sealing groove is formed between the annular partition plate and the rotary drum, an annular groove is formed in the top of the shell frame, an annular cover plate is arranged above the annular groove in a sealing mode, and a plurality of oil pipes are uniformly arranged in the shell frame; two ends of the oil pipe are respectively communicated with the annular groove and a cavity near the main bearing; the shell frame is provided with an oil inlet and is communicated with the annular groove, the bottom surface of the rolled shell frame is provided with an oil outlet, and an oil pump is additionally arranged and connected with the oil inlet and the oil outlet.
According to the preferable cooling and lubricating system, the cooling lubricating oil is adopted as cooling and lubricating medium, is slowly transported into the annular groove through the oil pump, gradually flows downwards from the annular groove into the oil pipes uniformly distributed in the shell frame, because the shell frame is made of heat-conducting metal, heat generated by energizing the winding coil is absorbed by the cooling lubricating oil under the heat conduction effect, then the cooling lubricating oil flows out of the oil pipes, sequentially enters into cavities near the main bearing and the auxiliary bearing, wets the main bearing and the auxiliary bearing, finally enters into the annular cavity formed in the bottom surface after the shell frame is rolled up, on one hand, partial cooling lubricating oil can be stored, on the other hand, the cooling lubricating oil after absorbing the heat enters into the oil pump from the oil outlet for next circulation. The mode effectively achieves the purposes of cooling, wear resistance and service life improvement of the rotary table.
Further preferably, a liquid level sensor is arranged on the inner wall of the housing frame, the liquid level sensor corresponds to a U-shaped cavity formed after the housing frame is rolled up, a warning lamp is arranged on the outer wall of the housing frame, and the liquid level sensor and the warning lamp are electrically connected.
In the above preferred mode, a certain liquid level can be preset, and when the liquid level of the cooling lubricating oil in the U-shaped cavity is lower than a certain position, the warning lamp is lightened to prompt that new cooling lubricating oil needs to be added or replaced.
Compared with the prior art, the invention has the beneficial effects that:
1. the horsepower of the whole permanent magnet synchronous motor is greatly enhanced through the two groups of iron cores, the winding coils and the magnetic steel substrate, the precision is higher, and the response speed is faster;
2. the circulating cooling and lubricating system is added in the turntable, so that the abrasion and heating problems of all parts during the rotation of the motor can be effectively reduced, and the service life is prolonged.
Drawings
Fig. 1 is a schematic structural diagram of a rotary table of a petroleum drilling machine directly driven by a combined permanent magnet synchronous motor according to embodiment 1;
fig. 2 is a schematic structural diagram of a first magnetic steel substrate of a rotary table of a combined permanent magnet synchronous motor direct-drive oil rig according to embodiment 1;
fig. 3 is a schematic structural diagram of a second magnetic steel substrate of a rotary table of a combined permanent magnet synchronous motor direct-drive oil rig according to embodiment 1;
fig. 4 is a schematic structural diagram of a rotary table of a combined permanent magnet synchronous motor direct-drive oil rig according to embodiment 2;
in the figure: 1. a housing frame; 2. tonifying the heart; 3. square tiles; 4. a drill spindle; 5. a first iron core; 6. a second iron core; 7. a rotating drum; 8. a first magnetic steel substrate; 9. a second magnetic steel substrate; 10. a main bearing; 11. a sub-bearing; 12. sealing rubber; 13. an annular partition plate; 14. an annular groove; 15. an annular cover plate; 16. an oil pipe; 17. an oil inlet hole; 18. and an oil outlet.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by one of ordinary skill in the art without undue burden on the person of ordinary skill in the art based on embodiments of the present invention, are within the scope of the present invention.
Example 1
As shown in fig. 1 to 3, the oil rig turntable directly driven by the combined permanent magnet synchronous motor provided by the embodiment comprises a shell frame 1, a stator, a rotor, a square bushing 2, a square tile 3 and a rig rotating shaft 4, wherein the shell frame 1 surrounds and is fixed outside the stator; the stator comprises a first iron core 5, a second iron core 6 and winding coils wound on the first iron core 5 and the second iron core 6, wherein the first iron core 5 is in an arc thick tile shape, 6 first iron cores 5 are combined to form a circular-like tubular structure, 6 second iron cores 6 are in a fan-shaped sheet shape and are positioned below the first iron cores 5, and each first iron core 5 and each second iron core 6 can be independently detached and independently controlled; the winding coils on each first iron core 5 and each second iron core 6 are connected in parallel;
the rotor comprises a rotary drum 7, first magnetic steel substrates 8 and second magnetic steel substrates 9, wherein the upper part of the rotary drum 7 is thick, the lower part of the rotary drum is thin, 6 first magnetic steel substrates 8 are arc Bao Wa sheets and are attached to the side wall of the upper part of the rotary drum 7, 6 second magnetic steel substrates 9 are fan-shaped sheets and are attached to the step surface of the middle part of the rotary drum 7, and each first magnetic steel substrate and each second magnetic steel substrate can be independently detached and independently controlled and respectively correspond to winding coils of the first iron core 5 and the second iron core 6;
the lower part of the shell frame 1 is connected with the rotary drum 7 through a main bearing 10; the square bushing 3 is fixed inside the square bushing 2, and the drilling machine rotating shaft 4 is fixed inside the square bushing.
On the oil rig turntable, when the oil rig turntable rotates, the winding coils of the first iron core and the second iron core generate current, magnetic force is generated under the action of the magnetic steel substrate of the rotor, and the rotor starts to rotate relative to the stator according to the acting force and the reacting force principle. When any one of the first iron cores and the first magnetic steel substrates, or any one of the second iron cores and the second magnetic steel substrates are damaged, the parallel connection mode is adopted, so that no influence is exerted on other intact winding coils, the whole turntable can still drive the drill bit to rotate, and the damaged iron cores and the damaged magnetic steel substrates can be detached at will. The mode of directly driving the drill bit by the permanent magnet synchronous motor with the two groups of iron cores and winding coils has the advantages of high safety performance, convenience in maintenance, low maintenance cost, stronger power, higher precision and faster response.
Example two
As shown in fig. 4, the oil rig turntable directly driven by the combined permanent magnet synchronous motor provided by the embodiment comprises a shell frame 1, a stator, a rotor, a square bushing 2, a square tile 3 and a rig rotating shaft 4; the shell frame is made of heat-conducting metal, and the shell frame 1 surrounds and is fixed outside the stator; the stator comprises a first iron core 5, a second iron core 6 and winding coils wound on the first iron core 5 and the second iron core 6, wherein the first iron core 5 is in an arc thick tile shape, 6 first iron cores 5 are combined to form a circular-like tubular structure, 6 second iron cores 6 are in a fan-shaped sheet shape and are positioned below the first iron cores 5, and each first iron core 5 and each second iron core 6 can be independently detached and independently controlled; the winding coils on each first iron core 5 and each second iron core 6 are connected in parallel;
the rotor comprises a rotary drum 7, a first magnetic steel substrate 8 and a second magnetic steel substrate 9, wherein the upper part of the rotary drum 7 is thick, the lower part of the rotary drum is thin, a plurality of first magnetic steel substrates 8 are arc Bao Wa sheet-shaped and are attached to the side wall of the upper part of the rotary drum 7, 6 second magnetic steel substrates 9 are fan-shaped sheet-shaped and are attached to the step surface in the middle of the rotary drum 7, and each of the first magnetic steel substrates 8 and the second magnetic steel substrates 9 can be independently detached and independently controlled and respectively correspond to winding coils of the first iron core 5 and the second iron core 6;
the lower part of the shell frame 1 is connected with the rotary drum 7 through a main bearing 10 and a secondary bearing 11 which are arranged up and down; the square bushing 3 is fixed in the square bushing 2, and the drilling machine rotating shaft 4 is fixed in Fang Wana;
the lower part of the shell frame 1 is rolled up inwards to be U-shaped, and the tail end of the rolled shell frame 1 is overlapped with the side wall of the bottom of the rotary drum 7 and a gap is reserved between the tail end and the side wall of the bottom of the rotary drum; the part of the tail end of the rolled shell frame 1 overlapped with the side wall of the bottom of the rotary drum 7 is provided with sealing rubber 12.
The cooling and lubricating system is further arranged, the main bearing 10 is separated from the second iron core 6 by an annular partition 13, a sealing groove is arranged between the annular partition 13 and the rotary drum 7, an annular groove 14 is arranged at the top of the shell frame 1, an annular cover plate 15 is arranged above the annular groove 14 in a sealing manner, and a plurality of oil pipes 16 are uniformly arranged in the shell frame 1; two ends of the oil pipe 16 are respectively communicated with the annular groove 14 and a cavity near the main bearing 10; the shell frame 1 is provided with an oil inlet hole 17 and is communicated with the annular groove 14, the bottom surface of the rolled shell frame 1 is provided with an oil outlet hole 18, and an oil pump is additionally arranged and connected with the oil inlet hole 17 and the oil outlet hole 18.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The rotary table comprises a shell frame, a stator, a rotor, square cores, square tiles and a rotary shaft of the drilling machine, wherein the shell frame surrounds and is fixed outside the stator;
the stator is characterized by comprising a first iron core, a second iron core and winding coils wound on the first iron core and the second iron core, wherein the first iron core is in an arc thick tile shape, a plurality of first iron cores are combined to form a circular-like tubular structure, the second iron cores are in a fan-shaped sheet shape and are positioned below the first iron cores, and each of the first iron core and the second iron core can be independently detached and independently controlled; winding coils on each first iron core and each second iron core are connected in parallel;
the rotor comprises a rotary drum, a first magnetic steel substrate and a second magnetic steel substrate, wherein the upper part of the rotary drum is thick, the lower part of the rotary drum is thin, a plurality of first magnetic steel substrates are arc Bao Wa sheets and are attached to the side wall of the upper part of the rotary drum, a plurality of second magnetic steel substrates are fan-shaped sheets and are attached to the step surface of the middle part of the rotary drum, and each first magnetic steel substrate and each second magnetic steel substrate can be independently detached and independently controlled and respectively correspond to winding coils of the first iron core and the second iron core;
the lower part of the shell frame is connected with the rotary drum through a main bearing; the square bushing is fixed in the square bushing, and the drilling machine rotating shaft is fixed in Fang Wana;
the oil rig carousel is last to be equipped with cooling lubrication system, specifically does: the shell frame is made of heat-conducting metal, the main bearing and the second iron core are separated by an annular partition plate, a sealing groove is formed between the annular partition plate and the rotary drum, an annular groove is formed in the top of the shell frame, an annular cover plate is arranged above the annular groove in a sealing mode, and a plurality of oil pipes are uniformly arranged in the shell frame; two ends of the oil pipe are respectively communicated with the annular groove and a cavity near the main bearing; the shell frame is provided with an oil inlet and is communicated with the annular groove, the bottom surface of the rolled shell frame is provided with an oil outlet, and an oil pump is additionally arranged and connected with the oil inlet and the oil outlet.
2. The permanent magnet synchronous motor direct drive oil rig turntable according to claim 1, wherein a secondary bearing is further arranged below the main bearing.
3. The rotary table of the combined permanent magnet synchronous motor direct drive oil rig according to claim 2, wherein the main bearing is vertically inclined inwards, and the bearing direction of the auxiliary bearing is vertically inclined outwards.
4. The rotary table of the petroleum drilling machine directly driven by the combined permanent magnet synchronous motor according to claim 1, wherein the lower part of the shell frame is rolled up inwards to be U-shaped, and the tail end of the rolled shell frame and the side wall of the bottom of the rotary drum are overlapped together with a gap left between the tail end of the rolled shell frame and the side wall of the bottom of the rotary drum.
5. The rotary table of the combined permanent magnet synchronous motor direct drive oil rig according to claim 4, wherein the part of the tail end of the housing frame which is rolled up and the side wall of the bottom of the rotary drum are provided with sealing rubber.
6. The rotary table of the petroleum drilling machine directly driven by the combined permanent magnet synchronous motor according to claim 1, wherein a liquid level sensor is arranged on the inner wall of the housing frame, the liquid level sensor corresponds to a U-shaped cavity formed after the housing frame is rolled up, a warning lamp is arranged on the outer wall of the housing frame, and the liquid level sensor and the warning lamp are electrically connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811277884.XA CN109347290B (en) | 2018-10-30 | 2018-10-30 | Oil rig carousel that combination formula PMSM directly drives |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811277884.XA CN109347290B (en) | 2018-10-30 | 2018-10-30 | Oil rig carousel that combination formula PMSM directly drives |
Publications (2)
| Publication Number | Publication Date |
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| CN109347290A CN109347290A (en) | 2019-02-15 |
| CN109347290B true CN109347290B (en) | 2023-04-28 |
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| CN201811277884.XA Active CN109347290B (en) | 2018-10-30 | 2018-10-30 | Oil rig carousel that combination formula PMSM directly drives |
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Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2916013B1 (en) * | 2007-05-09 | 2009-11-20 | Dietswell Engineering Sa | DEVICE FOR THE ROTATIONAL DRIVE OF A TUBULAR ELEMENT PROVIDED FOR RECEIVING AND VEHICULATING A PRESSURIZED FLUID |
| CN102667009A (en) * | 2009-12-21 | 2012-09-12 | 凯文·R·威廉姆斯 | Permanent magnet direct drive drawworks |
| CN207819655U (en) * | 2018-01-31 | 2018-09-04 | 湖北环一电磁装备工程技术有限公司 | A kind of wheel driver that no frame permanent magnet synchronous motor directly drives |
| CN108233618A (en) * | 2018-01-31 | 2018-06-29 | 湖北环电磁装备工程技术有限公司 | The jack device that a kind of no frame permanent magnet synchronous motor directly drives |
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