Underwater shielding type permanent magnet synchronous motor

Abstract

The invention discloses an underwater shielding type permanent magnet synchronous motor, which comprises a rotor, a stator, a rotor bracket, a permanent magnet check ring, a rotor shielding sleeve, a rotor yoke and a permanent magnet, and epoxy resin is filled in a closed space formed by the rotor bracket, the permanent magnet check ring, the rotor shielding sleeve, the rotor yoke and the permanent magnet. A closed space formed by the driving end shielding end plate, the stator shielding sleeve, the stator iron core with the winding, the machine shell and the non-driving end shielding end plate is filled with epoxy resin, and the rotor driving end is provided with a sand throwing table, a non-contact sealing device and a driving end composite water lubrication bearing. The non-driving end of the rotor is provided with a non-driving end composite water lubrication bearing and a filter. The shielded motor adopts the water-lubricated sliding bearing, the vibration noise level is lower than that of a shielded motor adopting a rolling bearing, the stealth performance is better, a reference basis is provided for the design of the shielded motor, the application field of the shielded motor is widened, and the shielded motor has very high economic value and social benefit.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, specifically relating to a shielded permanent magnet synchronous motor structure that operates in seawater. Background Technology

[0002] The propulsion motors used in small and medium-sized unmanned underwater vehicles mostly adopt water-cooled motors or oil-filled pressure-compensated deep-sea motors housed in dry pressure chambers.

[0003] The two types of motors have their own characteristics: the water-cooled motor in the dry pressure tank has a simple structure, but the propulsion tank requires components such as a shaft thrust bearing and a stern shaft sealing device, which increases the cost and limits the diving depth of the unmanned underwater vehicle; while the oil-filled pressure-compensated deep-sea motor has its internal winding insulation structure immersed in oil. If its seal or pressure compensation fails, seawater will enter the motor and cause a decrease in the winding insulation performance, affecting the use of the propulsion motor.

[0004] In addition, most oil-filled pressure-compensated deep-sea motors use rolling bearings as shaft supports, and their vibration and noise levels are generally higher than those of sliding bearings, which affects their stealth performance. Summary of the Invention

[0005] The purpose of this invention is to provide an underwater shieldable permanent magnet synchronous motor for unmanned underwater vehicles to overcome the above-mentioned technical defects.

[0006] The technical solution adopted by this invention to solve its technical problem is: an underwater shielded permanent magnet synchronous motor, including a rotor and a stator. The rotor consists of a rotor support, a permanent magnet retaining ring, a rotor shielding sleeve, a permanent magnet, a permanent magnet pressure plate, and a rotor yoke. The enclosed space formed by the rotor support, permanent magnet retaining ring, rotor shielding sleeve, rotor yoke, and permanent magnet is filled with epoxy resin to protect the permanent magnet from seawater corrosion and to withstand high pressure. The stator consists of a drive end shielding plate, a stator shielding sleeve, and a stator core with windings. The rotor is composed of a housing, a non-drive end shielding plate, a drive end cover, a non-drive end cover, and a watertight aviation plug. The enclosed space formed by the drive end shielding plate, the stator shielding sleeve, the stator core with windings, the housing, and the non-drive end shielding plate is filled with epoxy resin to protect the motor stator windings from contact with seawater and to withstand high pressure. The rotor drive end is equipped with a sand-throwing disc, a non-contact sealing device, and a drive end composite water-lubricated bearing. The non-drive end of the rotor is equipped with a non-drive end composite water-lubricated bearing and a filter.

[0007] The underwater shielded permanent magnet synchronous motor has a drive end composite water-lubricated bearing and a non-drive end composite water-lubricated bearing, which includes a pair of radial water-lubricated bearings and a pair of thrust water-lubricated bearings. It can support the radial force of the rotor under water lubrication conditions, and at the same time withstand the thrust and tension from the shaft in both directions.

[0008] The underwater shielded permanent magnet synchronous motor has a sand-throwing disc consisting of a pair of semi-circular discs, which can block mud, sand or impurities that may enter the motor during operation.

[0009] The underwater shielded permanent magnet synchronous motor has a filter that contains magnets to remove iron filings, preventing iron filings mixed in with seawater from entering the motor and attracting and accumulating with the permanent magnets, causing scratches between the stator and rotor.

[0010] The underwater shielded permanent magnet synchronous motor has a composite water-lubricated bearing at its drive end, which includes a radial bearing radial pad, a radial bearing support seat, a thrust bearing rotating support plate, a thrust pad, and a thrust bearing disc.

[0011] The underwater shielded permanent magnet synchronous motor has a non-contact sealing device that includes a comb-shaped sealing structure to prevent mud or other impurities in seawater from entering the motor.

[0012] The beneficial effects of this invention are as follows: Firstly, the motor in this invention can prevent silt or impurities in seawater from entering the motor and causing wear on the water-lubricated bearings. Secondly, it can prevent iron filings in seawater from entering the motor and accumulating on the surface of the permanent magnet motor rotor, causing stator-rotor scraping. Finally, the vibration and noise level of the shielded motor using water-lubricated bearings is lower than that of the shielded motor using rolling bearings, and its stealth performance is better. This invention not only provides a reference for the design of shielded motors but also broadens the application fields of shielded motors, possessing very high economic value and social benefits.

[0013] In addition, most conventional shielded motors use rolling bearings, while the shielded motor of this invention uses water-lubricated sliding bearings, resulting in lower vibration and noise levels compared to shielded motors using rolling bearings, and superior stealth performance. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the motor structure of the present invention;

[0015] Figure 2 This is a schematic diagram of the sand-throwing disc structure of the present invention;

[0016] Figure 3 and Figure 4 This is a schematic diagram of the non-contact dynamic sealing device of the present invention;

[0017] Figure 5 and Figure 6 This is a schematic diagram of the composite water-lubricated bearing structure of the present invention;

[0018] Figure 7 This is a schematic diagram of the filter structure of the present invention;

[0019] Figure 8This is a schematic diagram of the stator structure of the present invention.

[0020] Figure 9 and Figure 10 This is a schematic diagram of the rotor structure of the present invention.

[0021] The reference numerals in the attached figures are as follows: 1—sand-throwing disc, 2—non-contact sealing device, 3—drive-end composite water-lubricated bearing, 3.1—comb-shaped sealing structure, 4—rotor, 4.2—radial bearing support seat, 4.1—radial bearing radial pad, 4.3—support plate, 4.4—thrust pad, 4.5—thrust disc, 5—stator, 6—non-drive-end composite water-lubricated bearing, 6.1—drive-end shielding end plate, 6.2—stator shielding sleeve, 6.3—stator core with windings, 6.4—casing, 6.5—non-drive-end shielding end plate, 6.6—watertight connector, 6.7—epoxy resin, 7—filter, 7.1—rotor support, 7.2—permanent magnet retaining ring, 7.3—rotor shielding sleeve, 7.4—permanent magnet, 7.5—permanent magnet pressure plate, 7.6—rotor yoke, 7.7—epoxy resin. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings.

[0023] Reference Figures 1-10 As shown, as the first embodiment of the present invention, an underwater shielded permanent magnet synchronous motor capable of long-term immersion in seawater is disclosed, including a stator 5, a rotor 4, a filter 7, a non-contact sealing device 2, a drive-end composite water-lubricated bearing 3, a non-drive-end composite water-lubricated bearing 6, a sand-throwing disc 1, etc.

[0024] The stator 5 is composed of a drive-end shielding plate 6.1, a stator shielding sleeve 6.2, a stator core with windings 6.3, a housing 6.4, a non-drive-end shielding plate 6.5, a drive-end end cover, a non-drive-end end cover, and a watertight aviation plug 6.6. The enclosed space formed by the drive-end shielding plate 6.1, the stator shielding sleeve 6.2, the stator core with windings 6.3, the housing 6.4, and the non-drive-end shielding plate 6.5 is filled with epoxy resin 6.7, which can protect the motor stator windings from contact with seawater and withstand high pressure.

[0025] The rotor 4 is composed of a rotor support 7.1, a permanent magnet retaining ring 7.2, a rotor shielding sleeve 7.3, a permanent magnet 7.4, a permanent magnet pressure plate 7.5, and a rotor yoke 7.6. The enclosed space formed by the rotor support 7.1, the permanent magnet retaining ring 7.2, the rotor shielding sleeve 7.3, the rotor yoke 7.6, and the permanent magnet 7.4 is filled with epoxy resin 7.7, which can protect the permanent magnet from seawater corrosion and withstand high pressure.

[0026] The filter 7 is a filter containing a magnet inside, which can filter out iron filings and prevent iron filings mixed in with seawater from entering the motor and attracting and accumulating with the permanent magnet 7.4 of the permanent magnet motor, causing the stator and rotor to scrape.

[0027] The non-contact sealing device 2 includes a comb-shaped sealing structure 3.1, which can prevent mud or other impurities in seawater from entering the motor.

[0028] The drive-end composite water-lubricated bearing 3 includes a radial bearing radial pad 4.1, a radial bearing support seat 4.2, a thrust bearing rotating support plate 4.3, a thrust pad 4.4, and a thrust bearing disc 4.5.

[0029] The aforementioned drive-end composite water-lubricated bearing 3 and non-drive-end composite water-lubricated bearing 6 include a pair of radial water-lubricated bearings and a pair of thrust water-lubricated bearings, which can support the radial force of the rotor under water lubrication conditions, and at the same time withstand the thrust and tension from the shaft in both directions.

[0030] The aforementioned sand-throwing disc 1 includes a disc-shaped component consisting of a pair of semi-circular discs, which can block mud, sand, or impurities that may enter the motor during motor operation.

[0031] Conventional shielded motors mostly use rolling bearings, while the shielded motor of this invention uses water-lubricated sliding bearings. Its vibration and noise levels are lower than those of shielded motors using rolling bearings, and its stealth performance is superior. This invention not only provides a reference for the design of shielded motors, but also broadens the application fields of shielded motors, and has very high economic value and social benefits.

[0032] The motor in this invention has two advantages: first, it prevents silt or impurities in seawater from entering the motor and causing wear on the water-lubricated bearings; second, it prevents iron filings in seawater from entering the motor and accumulating on the surface of the permanent magnet motor rotor, causing scraping between the stator and rotor. Finally, the vibration and noise level of the shielded motor using water-lubricated bearings is better than that of the shielded motor using rolling bearings, and it has better stealth performance. This invention not only provides a reference for the design of shielded motors, but also broadens the application field of shielded motors, and has very high economic value and social benefits.

[0033] The above embodiments are merely illustrative of the principles and effects of the present invention, as well as some of the application examples. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. An underwater shielded permanent magnet synchronous motor, comprising a rotor (4) and a stator (5), characterized in that: The rotor (4) consists of a rotor support (7.1), a permanent magnet retaining ring (7.2), a rotor shielding sleeve (7.3), a permanent magnet (7.4), a permanent magnet pressure plate (7.5), and a rotor yoke (7.6). The enclosed space formed by the rotor support (7.1), the permanent magnet retaining ring (7.2), the rotor shielding sleeve (7.3), the rotor yoke (7.6), and the permanent magnet (7.4) is filled with epoxy resin (7.7). The stator (5) consists of a drive end shielding plate (6.1), a stator shielding sleeve (6.2), a stator core with windings (6.3), a housing (6.4), and a non-drive end shielding plate (6.1). The rotor (4) is composed of a shielded end plate (6.5), a drive end cover, a non-drive end cover, and a watertight aviation plug (6.6). The closed space formed by the drive end shielded end plate (6.1), the stator shield sleeve (6.2), the stator core with windings (6.3), the housing (6.4), and the non-drive end shielded end plate (6.5) is filled with epoxy resin (6.7). The drive end of the rotor (4) is respectively provided with a sand-throwing disc (1), a non-contact sealing device (2), and a drive end composite water-lubricated bearing (3). The non-drive end of the rotor (4) is respectively provided with a non-drive end composite water-lubricated bearing (6) and a filter (7).

2. The underwater shielded permanent magnet synchronous motor according to claim 1, characterized in that, The drive-end composite water-lubricated bearing (3) and the non-drive-end composite water-lubricated bearing (6) include a pair of radial water-lubricated bearings and a pair of thrust water-lubricated bearings, which support the radial force of the rotor under water lubrication conditions, and simultaneously bear the thrust and tension from the shaft in both directions.

3. An underwater shielded permanent magnet synchronous motor according to claim 1 or 2, characterized in that, The aforementioned sand-throwing disc (1) comprises a disc-shaped component consisting of a pair of semi-circular discs.

4. The underwater shielded permanent magnet synchronous motor according to claim 3, characterized in that, The filter (7) is a filter containing a magnet inside, which can filter out iron filings.

5. The underwater shielded permanent magnet synchronous motor according to claim 4, characterized in that, The drive end composite water-lubricated bearing (3) includes a radial bearing radial pad (4.1), a radial bearing support seat (4.2), a thrust bearing rotating support plate (4.3), a thrust pad (4.4), and a thrust bearing disc (4.5).

6. The underwater shielded permanent magnet synchronous motor according to claim 5, characterized in that, The non-contact sealing device (2) includes a comb-shaped sealing structure (3.1).

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