CN219227330U - Liquid filling type fractional slot permanent magnet synchronous submersible motor - Google Patents
Liquid filling type fractional slot permanent magnet synchronous submersible motor Download PDFInfo
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- CN219227330U CN219227330U CN202320118895.3U CN202320118895U CN219227330U CN 219227330 U CN219227330 U CN 219227330U CN 202320118895 U CN202320118895 U CN 202320118895U CN 219227330 U CN219227330 U CN 219227330U
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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
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Abstract
The utility model provides a liquid-filled fractional slot permanent magnet synchronous submersible motor, which comprises a stator and a rotor, wherein the stator comprises a stator punching sheet, the stator punching sheet is provided with a through hole, a closed winding slot is formed by the through hole, and a winding wire penetrates through the closed winding slot to form a water-resistant winding; the rotor comprises a shaft and a rotor punching sheet arranged on the shaft, wherein the rotor punching sheet is provided with a magnetic steel groove, and magnetic steel is arranged in the magnetic steel groove. The motor can reduce mechanical loss and improve motor efficiency.
Description
Technical Field
The utility model relates to the technical field of motors, in particular to a liquid filling type fractional slot permanent magnet synchronous submersible motor.
Background
The liquid-filled submersible motor is basically an asynchronous motor, and has the advantages of good water filling and heat dissipation effects in the motor, no strict requirements on sealing and the like, and is applied to some industries, such as a seawater lift pump, a fire pump and the like. The inside water filling formula submersible motor fills water, and stator coil adopts water-fast winding wire, and the rotor contains in the inside rotor of not having the rotor mainly comprises rotor core and pivot two parts, and the pivot is long and thin cylinder, because of electromagnetic induction principle, the rotor can rotate under the pivot drive. The asynchronous motor is low in efficiency and power density, and because the motor is filled with water, the problem of electric leakage caused by abrasion of the waterproof winding wire exists.
The permanent magnet motor can form a high-strength magnetic field in the motor due to the fact that the rotor is internally provided with high-performance permanent magnet materials, when the motor runs stably, the exciting magnetic field interacts with the rotating magnetic field of the stator winding, the motor is involved in synchronization, and the cage bars of the outer ring of the rotor are basically free of current. The water-filled submersible motor can be obviously improved in efficiency and power density by adopting the permanent magnet motor. However, the permanent magnet motor has the problems of large phase band harmonic content, large torque pulsation and the like, so that the water filling type motor adopts an asynchronous motor instead of the permanent magnet motor.
Disclosure of Invention
Aiming at the technical problems in the prior art, the utility model provides a liquid filling type fractional slot permanent magnet synchronous submersible motor which can improve the motor efficiency.
The embodiment of the utility model provides a liquid-filled fractional slot permanent magnet synchronous submersible motor, which comprises a stator and a rotor, wherein the stator comprises a stator punching sheet, a through hole is formed in the stator punching sheet, a closed winding slot is formed in the through hole, and a winding wire penetrates through the closed winding slot to form a water-resistant winding; the rotor comprises a shaft and a rotor punching sheet arranged on the shaft, wherein the rotor punching sheet is provided with a magnetic steel groove, and magnetic steel is arranged in the magnetic steel groove.
In an alternative embodiment, the magnetic steel is a neodymium iron boron permanent magnet material.
In an alternative embodiment, the rotor sheet is V-shaped or in-line.
In an alternative embodiment, the closed winding slots are provided with slot wedges which are pine.
In an alternative embodiment, the magnetic steel groove adopts a potting structure.
In an alternative embodiment, the closed winding slots are in a parallel slot structure.
In an optional embodiment, the liquid-filled fractional slot permanent magnet synchronous submersible motor further comprises a casing, a rear blank cap and a flange end cover, wherein the rear blank cap and the flange end cover are arranged in a penetrating mode through a shaft of the rotor, the casing is sleeved outside the stator and encloses a motor inner cavity together with the rear blank cap and the flange end cover, propylene glycol or mixed liquid of propylene glycol and water is filled in the motor inner cavity, and the rotor and the stator are both positioned in the motor inner cavity and immersed in the propylene glycol or the mixed liquid of propylene glycol and water.
In the liquid-filled fractional slot permanent magnet synchronous submersible motor provided by the embodiment of the utility model, the permanent magnet material is arranged in the rotor, a high-strength magnetic field is formed in the motor, when the motor runs stably, the exciting magnetic field interacts with the rotating magnetic field of the stator winding, the motor is involved in synchronization, the cage bars of the outer ring of the rotor are basically free of current, and the efficiency and the power density of the water-filled submersible motor can be obviously improved. The stator of the motor provided by the embodiment of the utility model adopts a closed winding groove structure, so that the liquid flow resistance can be reduced, the mechanical loss is further reduced, and the motor efficiency is improved.
Drawings
In the drawings, which are not necessarily drawn to scale, like numerals may describe similar components in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar components. The accompanying drawings illustrate various embodiments by way of example in general and not by way of limitation, and together with the description and claims serve to explain the disclosed embodiments. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive of the present apparatus or method.
Fig. 1 is a schematic structural diagram of a winding of a liquid-filled fractional slot permanent magnet synchronous submersible motor according to an embodiment of the utility model.
Fig. 2 is a schematic cross-sectional structure of a liquid-filled fractional slot permanent magnet synchronous submersible motor according to an embodiment of the utility model, and a casing is not shown.
Fig. 3 is a back electromotive force diagram of a liquid filled fractional slot permanent magnet synchronous submersible motor according to an embodiment of the utility model.
Fig. 4 is a cross-sectional view of a liquid filled fractional slot permanent magnet synchronous submersible motor in accordance with an embodiment of the utility model.
In the figure: 1-stator, 11-stator punching sheets, 22-water-resistant windings, 13-slot wedges, 2-rotors, 21-magnetic steel, 22-magnetic steel grooves, 23-shafts, 3-housings, 31-motor inner cavities, 4-rear blank caps and 5-flange end covers.
Detailed Description
The present utility model will be described in detail below with reference to the drawings and detailed description to enable those skilled in the art to better understand the technical scheme of the present utility model. Embodiments of the present utility model will be described in further detail below with reference to the drawings and specific examples, but not by way of limitation.
The terms "first," "second," and the like, as used herein do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises" and the like means that elements preceding the word encompass the elements recited after the word, and not exclude the possibility of also encompassing other elements. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
In the present utility model, when it is described that a specific device is located between a first device and a second device, an intervening device may or may not be present between the specific device and the first device or the second device. When it is described that a particular device is connected to other devices, the particular device may be directly connected to the other devices without intervening devices, or may be directly connected to the other devices without intervening devices.
All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs, unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
Referring to fig. 1 and 2, an embodiment of the present utility model provides a liquid-filled fractional slot permanent magnet synchronous submersible motor, which comprises a stator 1 and a rotor 2, wherein the stator 1 comprises a stator punching sheet 11, the stator punching sheet 11 is provided with a through hole, the through hole forms a closed winding slot, and a winding wire penetrates through the closed winding slot to form a water-resistant winding 12; the rotor 2 comprises a shaft 23 and a rotor punching sheet arranged on the shaft 23, wherein the rotor punching sheet is provided with a magnetic steel groove 22, and magnetic steel 21 is arranged in the magnetic steel groove 22.
In the liquid-filled fractional slot permanent magnet synchronous submersible motor provided by the embodiment of the utility model, the permanent magnet material is arranged in the rotor 2, a high-strength magnetic field is formed in the motor, when the motor runs stably, the exciting magnetic field interacts with the rotating magnetic field of the stator 1 winding, the motor is drawn into synchronization, the cage bars of the outer ring of the rotor 2 are basically free of current, and the efficiency and the power density of the water-filled submersible motor can be obviously improved. The stator 1 of the motor provided by the embodiment of the utility model adopts a closed winding groove structure, the harmonic content of the motor is small, the torque pulsation is small, the vibration noise is low, the copper ratio of the motor can be improved, and the winding process is simple. The closed winding slots can reduce liquid flow resistance, so that mechanical loss is reduced, and motor efficiency is improved.
In some embodiments, the magnetic steel 21 is a neodymium iron boron permanent magnet material. The magnetic steel 21 of the neodymium iron boron permanent magnet material has large magnetic energy product and excellent magnetic performance.
Referring to fig. 1, in some embodiments, the rotor blades are V-shaped or in-line. In the exemplary embodiment, the magnetic steel 21 is embedded in a V-shape. The V-shaped magnetic steel 21 superimposes electromagnetic torque and reluctance torque, and can achieve higher torque demand.
Referring to fig. 1 and 2, in some embodiments, the closed winding slots are provided with slot wedges 13, the slot wedges 13 sealing the slots. The slot wedge 13 is pine. The wedge 13 of pine plays a role in high-temperature expansion type fastening.
In some embodiments, the magnetic steel groove 22 is a potting structure. The magnetic steel 21 can be guaranteed not to corrode through encapsulation, reliability is strong, and magnetic moment attenuation caused by corrosion of the magnetic steel 21 is avoided.
In some embodiments, the water resistant winding 12 employs a single layer winding. The winding wire is wound in a penetrating manner, and the winding wire is suitable for a single-layer winding manner. The fractional slots cooperate with the single layer winding to reduce motor torque ripple.
In some embodiments, the closed winding slots are of parallel slot configuration.
In some embodiments, as shown in fig. 4, the liquid-filled fractional slot permanent magnet synchronous submersible motor further comprises a casing 3, a rear blank cap 4 and a flange end cover 5, the shaft 23 is penetrated through the rear blank cap 4 and the flange end cover 5, the casing 3 is sleeved outside the stator 1 and encloses a motor inner cavity 31 together with the rear blank cap 4 and the flange end cover 5, propylene glycol is filled in the motor inner cavity 31, and the rotor 2 and the stator 1 are both positioned in the motor inner cavity 31 and immersed in the propylene glycol. The propylene glycol is colorless, viscous and stable liquid, is colorless, odorless and nontoxic, and the rotor 2 is soaked in the propylene glycol, so that the rotor has no corrosion effect on the magnetic steel 21. In addition, the propylene glycol is non-conductive, so that the problem that a water-filled motor waterproof layer is lost and the motor is not insulated can be solved.
Because the rotor 2 is encapsulated (the magnetic steel groove 22 adopts an encapsulating structure), and the stator 1 is a water-resistant winding, the inner cavity 31 of the motor can be filled with pure propylene glycol and mixed liquid of propylene glycol and water, wherein the content of the propylene glycol in the mixed liquid of the propylene glycol and the water is more than 70 percent by weight percent.
Compared with an asynchronous motor in the related art, the permanent magnet synchronous submersible motor structure provided by the embodiment of the utility model has the advantages of high motor efficiency, high power density, high power factor and the like. Compared with an asynchronous motor with the same specification, the efficiency of the permanent magnet motor can be improved by 2-8 percentage points, the primary energy efficiency can be improved by 1-2.5 percentage points, and the efficiency and the power factor can be kept higher within the rated load range of 25% -120%, so that the energy-saving effect is more remarkable during light load operation.
According to the embodiment of the utility model, the motor is internally filled with propylene glycol or the mixed solution of the propylene glycol and a little water, so that the service life of the motor can be prolonged, and the leakage risk of insulation damage can be reduced. In addition, the propylene glycol has better heat conduction capability, is favorable for heat dissipation of the motor, and can solve the problem of insulation loss caused by water filling inside.
The single-layer distributed winding adopted by the embodiment of the utility model can achieve the effects of small harmonic content of the motor, small torque fluctuation and strong practicality, and improves the inherent harmonic problem of the permanent magnet motor.
The liquid-filled fractional slot permanent magnet synchronous submersible motor provided by the embodiment of the utility model is variable-frequency, the rotating speed of the motor is adjustable, and the motor can be well applied to the submersible pump industry. The problem of relative fixed of related asynchronous motor rotational speed is solved.
Application scenario
Referring to fig. 1 and 2, a 120kw,4 pole permanent magnet motor for a seawater lift pump is provided. The permanent magnet motor comprises a stator 1 and a rotor 2, wherein the stator 1 comprises a stator punching sheet 11, the stator punching sheet 11 is provided with a closed winding groove, a winding wire penetrates through the closed winding groove to form a water-resistant winding 12, the winding groove is sealed by a slot wedge 13, and the slot is insulated to isolate different electric conductors. The rotor 2 comprises a shaft 23 and rotor punching sheets arranged on the shaft 23, wherein the rotor punching sheets are provided with magnetic steel grooves 22, magnetic steel 21 are arranged in the magnetic steel grooves 22, the number of winding grooves of a motor stator is 60, a single-layer winding is adopted, and the winding grooves adopt closed grooves. The rotor is 8 poles. The magnetic steel is made of V-shaped embedded neodymium iron boron materials. In addition, pure propylene glycol liquid is filled in the motor, water-resistant winding wires are adopted, and the reliability of the motor is high. Is being applied to the industry of the submerged water pump.
The main parameters of the liquid filling type fractional slot permanent magnet synchronous submersible motor are as follows:
the center is high: 225
Rotational speed: 1500rpm
Frequency: 100Hz
Power: 120kw
Number of grooves: 60
Number of poles: 8
Stator outer diameter: 368
The cooling mode is as follows: diving water
The liquid filling type fractional slot permanent magnet synchronous submersible motor of the embodiment has the following characteristics:
the motor efficiency can reach more than 95 percent, and the power factor is more than 0.99. Compared with the related asynchronous motor, the efficiency is about 85%, the power factor is about 0.88, and the energy-saving effect of the motor in the embodiment of the utility model reaches 13%.
As shown in fig. 3, the liquid-filled fractional slot permanent magnet synchronous submersible motor provided by the embodiment of the utility model has good back electromotive force sine degree and low harmonic content, and compared with the technical scheme of the integer slot permanent magnet synchronous motor, the torque fluctuation of the motor provided by the embodiment of the utility model is reduced from 30% to 6%.
The embodiment of the utility model fills the blank that the permanent magnet motor is applied to the market of the submersible pump.
The copper ratio of the motor structure of the embodiment of the utility model is high, which can reach more than 50 percent, and the manufacturability is simple.
The above embodiments are only exemplary embodiments of the present utility model and are not intended to limit the present utility model, the scope of which is defined by the claims. Various modifications and equivalent arrangements of this utility model will occur to those skilled in the art, and are intended to be within the spirit and scope of the utility model.
Claims (7)
1. A liquid filling type fractional slot permanent magnet synchronous submersible motor comprises a stator and a rotor, and is characterized in that,
the stator comprises a stator punching sheet, wherein a through hole is formed in the stator punching sheet, a closed winding groove is formed in the through hole, and a winding wire penetrates through the closed winding groove to form a water-resistant winding;
the rotor comprises a shaft and a rotor punching sheet arranged on the shaft, wherein the rotor punching sheet is provided with a magnetic steel groove, and magnetic steel is arranged in the magnetic steel groove.
2. The liquid filled fraction tank permanent magnet synchronous submersible motor of claim 1 wherein the magnetic steel is a neodymium iron boron permanent magnet material.
3. The liquid filled fractional slot permanent magnet synchronous submersible motor of claim 1 wherein the rotor laminations are V-shaped or in-line.
4. The liquid filled fractional slot permanent magnet synchronous submersible motor of claim 1 wherein the closed winding slot is provided with a slot wedge which is pine.
5. The liquid filled fraction tank permanent magnet synchronous submersible motor of claim 1, wherein the magnetic steel tank adopts a potting structure.
6. The liquid filled fractional slot permanent magnet synchronous submersible motor of claim 1 wherein the closed winding slots are of parallel slot configuration.
7. The liquid filled fractional slot permanent magnet synchronous submersible motor according to claim 1, further comprising a casing, a rear cover and a flange end cover, wherein the rear cover and the flange end cover are arranged in a penetrating manner on a shaft of the rotor, the casing is sleeved outside the stator and encloses a motor inner cavity together with the rear cover and the flange end cover, propylene glycol or a mixed solution of propylene glycol and water is filled in the motor inner cavity, and the rotor and the stator are both positioned in the motor inner cavity and immersed in propylene glycol or a mixed solution of propylene glycol and water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320118895.3U CN219227330U (en) | 2023-01-13 | 2023-01-13 | Liquid filling type fractional slot permanent magnet synchronous submersible motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320118895.3U CN219227330U (en) | 2023-01-13 | 2023-01-13 | Liquid filling type fractional slot permanent magnet synchronous submersible motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219227330U true CN219227330U (en) | 2023-06-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320118895.3U Active CN219227330U (en) | 2023-01-13 | 2023-01-13 | Liquid filling type fractional slot permanent magnet synchronous submersible motor |
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| Country | Link |
|---|---|
| CN (1) | CN219227330U (en) |
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- 2023-01-13 CN CN202320118895.3U patent/CN219227330U/en active Active
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