CN111130289B

CN111130289B - High-efficiency energy-saving rare earth permanent magnet synchronous motor

Info

Publication number: CN111130289B
Application number: CN201911313005.9A
Authority: CN
Inventors: 周世斌; 万彩芹; 白恩飞; 罗春斌
Original assignee: Xi'an Yabang Electromechanical Equipment Co ltd
Current assignee: Xi'an Yabang Electromechanical Equipment Co ltd
Priority date: 2019-12-18
Filing date: 2019-12-18
Publication date: 2022-03-22
Anticipated expiration: 2039-12-18
Also published as: CN111130289A

Abstract

The invention discloses a high-efficiency energy-saving rare earth permanent magnet synchronous motor, which relates to a motor and adopts the technical scheme that: the bearing comprises an outer ring and an inner ring, an oil filling port penetrates through the position, deviating from the base, of the outer ring, a lubricating oil cavity and two sealing blocks are arranged in the shell above the oil filling port, lubricating oil is stored in the lubricating oil cavity, the sealing blocks are abutted to block the oil filling port and the lubricating oil cavity, a hot melting cavity for the sealing blocks to slide into is formed in one side, deviating from each other, of each sealing block, a solidified hot melt adhesive block is arranged in the hot melting cavity, and heat of the outer ring can be transferred to the hot melt adhesive block; an indicating piece is arranged in the lubricating oil cavity, the position of the indicating piece moves along with the lubricating oil liquid level in the lubricating oil cavity, and the end part of the indicating piece extends out of the shell. The motor can automatically add the lubricating oil into the bearing once, thereby preventing the bearing from being damaged and the energy consumption of the motor from increasing and leading the motor to always keep higher working efficiency; after the lubricating oil is automatically injected, a person can conveniently observe whether the lubricating oil is added or not through the indicating piece.

Description

High-efficiency energy-saving rare earth permanent magnet synchronous motor

Technical Field

The invention relates to a motor, in particular to a rare earth permanent magnet synchronous motor.

Background

The rare-earth permanent magnet motor has the same working principle as an electrically excited synchronous motor, and is different from the electrically excited synchronous motor in that the rare-earth permanent magnet motor is excited by replacing an excitation winding with a permanent magnet. Because the rare earth permanent magnet material has excellent magnetic performance, a strong permanent magnetic field can be established without external energy after the rare earth permanent magnet material is magnetized, and the rare earth permanent magnet motor manufactured by replacing the electric excitation field of the traditional motor has high efficiency, simple structure, reliable operation, small volume and light weight.

The Chinese patent application with the prior application publication number of CN104852541A discloses an energy-saving permanent magnet motor for a pump, which mainly comprises a machine base, a front end cover, a rear end cover, a stator winding, a stator iron core, a rotating shaft, a rotor iron core, a conducting bar, a rare earth permanent magnet, a fan and a junction box, wherein the stator winding is embedded in a stator groove of the stator iron core, the stator iron core is fixed in the machine base, the front end cover and the rear end cover are respectively arranged at two ends of the machine base, a rotor is arranged in the machine base between the front end cover and the rear end cover, the rotor is positioned in an inner cavity of the stator iron core and the stator winding, a certain gap is left between the rotor and the stator iron core as well as between the rotor and the stator winding, the rotor comprises the rotating shaft, the rotor iron core, the conducting bar and the rare earth permanent magnet, the rotating shaft is a rotating shaft of the rotor iron core and is used for installing the rotor iron core and transmitting torque and outputting mechanical power, the rotating shaft is arranged at the position of a central shaft of the rotor iron core, and two ends of the rotating shaft respectively extend and pass through the centers of the front end cover and the rear end cover, the centers of the front end cover and the rear end cover are respectively provided with a bearing, and the rotating shaft is arranged in the bearings so as to ensure that the rotor can drive the rotating shaft to rotate uniformly.

The above prior art solutions have the following drawbacks: the bearing is one of the key parts generating friction loss and noise in the motor, when the bearing runs for a long time, the internal lubrication condition of the bearing is deteriorated, the friction force of the rotation of the bearing is increased, and the energy consumption of the motor is increased by the bearing; although adding lubrication to bearings improves lubrication, it is difficult for a person to control the timing of adding lubrication to bearings.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide the efficient energy-saving rare earth permanent magnet synchronous motor which can automatically add lubricating oil into a bearing once and is convenient for personnel to observe whether the lubricating oil is added or not.

The technical purpose of the invention is realized by the following technical scheme: a high-efficiency energy-saving rare earth permanent magnet synchronous motor comprises a base, a casing, a stator and a rotor, wherein the stator and the rotor are arranged in the casing, the rotor is coaxially fixed with a rotating shaft, the rotating shaft and the casing are rotatably connected through a bearing arranged between the rotating shaft and the casing, the bearing comprises an outer ring and an inner ring, an oil filling port is arranged at the position, deviating from the base, of the outer ring in a penetrating manner, a lubricating oil cavity and two sealing blocks are arranged in the casing above the oil filling port, lubricating oil is stored in the lubricating oil cavity, the two sealing blocks are mutually abutted and separate the oil filling port from the lubricating oil cavity, a hot melt cavity for the sealing blocks to slide in is arranged at one side, deviating from each other, of the sealing blocks, a solidified hot melt adhesive block is arranged in the hot melt cavity, and the solidified hot melt adhesive block prevents the sealing blocks from sliding into the hot melt cavity;

the hot melt adhesive block abuts against the bearing, and the heat of the outer ring can be transferred to the hot melt adhesive block; the melting temperature of the hot melt adhesive block is 50-70 ℃, the hot melt cavity is partially filled after the hot melt adhesive block is melted, and lubricating oil in the lubricating oil cavity can enter the oil filling port through a gap between the two sealing blocks;

the lubricating oil cavity is internally provided with an indicating piece, the position of the indicating piece is moved along with the lubricating oil liquid level in the lubricating oil cavity, and the end part of the indicating piece extends out of the shell.

Through above-mentioned technical scheme, annotate in advance in the bearing and have lubricated oil, lubricated oil in the bearing itself can use for a long time. Under the normal operating condition of the motor, the bearing rotates under the good lubricating condition, the heat of the bearing is not enough to melt the hot melt adhesive, and the lubricating oil in the lubricating assembly is in a waiting state. When the bearing works for a long time or the internal lubricating oil is reduced due to leakage and poor working condition, the bearing is poor in lubrication, and the rotating temperature of the bearing is obviously increased. When the temperature of the outer ring rises to a certain value, the heat of the outer ring is transferred to the hot melt adhesive block and is enough to melt the hot melt adhesive block. After the hot melt adhesive block is melted, the hot melt adhesive block loses the abutting effect on the sealing block, and the sealing block is separated between the contact surfaces. Lubricating oil passes through the gap between the two sealing blocks and penetrates through the oil filling port to enter the bearing under the combined action of the gravity of the lubricating oil, so that new lubrication is provided for the bearing, and the bearing is prevented from being damaged and the energy consumption of the motor is prevented from being increased.

Along with lubricating oil injection bearing, the high position of indicator also reduces along with it, and the length that the indicator lever exposes outside the casing reduces, and personnel can directly perceivedly perceive this phenomenon when passing through to judge whether bearing has experienced high temperature operation, also can judge whether lubricated subassembly has acted and has failed. Because sufficient lubricating oil is injected into the bearing, the bearing can continuously and normally work for a long time, and sufficient personnel can observe the phenomenon when checking the bearing, so that the lubricating component is reset by taking time.

Preferably, the machine shell is provided with a detachable lubricating assembly, and the lubricating oil cavity, the indicator, the hot melt adhesive block, the sealing block and the hot melt cavity are all located in the lubricating assembly; the lubricating component is arranged in the shell, the outer ring wall of the outer ring forms the groove bottom of the mounting groove, the end, facing the inside of the shell, of the lubricating component is provided with a heat conducting wall, the shape of the heat conducting wall corresponds to that of the outer ring wall of the outer ring, and the heat conducting wall is abutted against the outer ring.

Through the technical scheme, the lubricating component can be disassembled and assembled with the shell, so that the lubricating component is convenient to produce and manufacture; and the personnel can reset the lubricating oil after the lubricating oil is injected once.

Preferably, the shapes of the sealing block and the hot melting cavity are bent to form a circular arc shape in accordance with the shape of the heat conducting wall, and a heat conducting silicone grease layer is arranged between the heat conducting wall and the outer ring.

Through above-mentioned technical scheme, heat conduction silicone grease is used for CPU heat dissipation more, and heat conduction silicone grease layer itself has higher heat conductivity, and heat conduction silicone grease layer can fill the air gap between heat conduction wall, outer lane, improves the heat conductivility of outer lane to heat conduction wall.

Preferably, the circumferential outer wall of the sealing block is provided with a first sealing ring, and the first sealing ring establishes sliding seal between the hot melting cavity and the lubricating oil cavity.

Through the technical scheme, the first sealing ring establishes sliding seal between the hot-melting cavity and the lubricating oil cavity, so that the lubricating oil is prevented from being influenced by contact with the hot-melting rubber block.

Preferably, the indicating part comprises an indicating plate and an indicating rod which are fixedly connected, the indicating plate is tightly attached to the upper liquid level of the lubricating oil in the lubricating oil cavity through a lower plate surface, the indicating plate floats on the lubricating oil, and the end part of the indicating rod, which deviates from the indicating plate, extends out of the shell.

Through the technical scheme, the indicating plate floats on the lubricating oil, the height of the indicating plate moves along with the height of the lubricating oil, and the indicating rod also moves; the end of the indicating rod exposed out of the shell is used for judging whether the indicating piece acts or not.

Preferably, the indicator plate is a piston plate, sliding seal is established with the inner wall of lubricating oil chamber through the sealing washer two of locating the periphery wall to the indicator plate, one side that the piston plate deviates from lubricating oil is equipped with the spring, the elasticity of spring orders about the piston plate and compresses tightly lubricating oil.

Through the technical scheme, the spring can provide driving force for the lubricating oil to enter the bearing; through setting up piston plate and sealing washer two, lubricating oil is difficult for outwards leaking through the indicator board. The combination of the spring and the piston plate ensures that the motor can reliably act by automatically injecting lubricating oil without keeping the installation mode of the base under.

Preferably, the end faces of the two sealing blocks, which are opposite to each other, are provided with a guide surface and a sealing surface, the sealing blocks are tightly abutted and sealed through the sealing surfaces, the guide surfaces are located above the sealing surfaces, the two guide surfaces are combined into an upward flaring shape, and the guide surfaces contact lubricating oil in the lubricating oil cavity.

Through the technical scheme, after the hot melt adhesive blocks are melted, the lubricating oil can generate component force for driving the two sealing blocks to separate at the guide surface under the combined action of the self gravity, so that the two sealing blocks can be reliably separated.

Preferably, the indicator comprises a blocking rod facing the oil filling opening, the blocking rod being located in the lubricating oil and not in contact with the sealing block; and after the lubricating oil enters the oil filling opening, the blocking rod is inserted into the oil filling opening and closes the oil filling opening.

Through above-mentioned technical scheme, after injecting lubricating oil into the bearing, the indicator moves down to the dead point, and the shutoff pole inserts in the oiling mouth, prevents that the lubricating oil in the bearing from getting rid of back to the lubricating oil intracavity through the oiling mouth.

Preferably, the bearing further comprises an oil seal ring, and the oil seal ring is located between the outer ring and the inner ring.

Through the technical scheme, due to the blocking of the oil seal ring, the lubricating oil in the bearing is not easy to evaporate and leak, and the lubricating oil in the bearing can be used for a long time.

In summary, compared with the prior art, the beneficial effects of the invention are as follows:

1. the motor can automatically add the lubricating oil into the bearing once, thereby preventing the bearing from being damaged and the energy consumption of the motor from being increased;

2. after the lubricating oil is automatically injected, personnel can conveniently observe whether the lubricating oil is added or not through the indicating piece;

3. the lubricating component is detachable, and the personnel can conveniently operate the lubricating component to reset for next use.

Drawings

FIG. 1 is a perspective view of an energy efficient rare earth permanent magnet synchronous machine of an embodiment;

FIG. 2 is a longitudinal sectional view of the embodiment;

FIG. 3 is an enlarged view of FIG. 2 at B;

FIG. 4 is an exploded view of the housing and lubrication assembly of the embodiment;

fig. 5 is a sectional view a-a of fig. 1.

In the figure, 1, a housing; 10. a base; 11. a stator; 12. a rotor; 13. a rotating shaft; 2. a bearing; 21. an outer ring; 22. an inner ring; 23. a ball bearing; 24. an oil seal ring; 211. an oil filling port; 3. a lubrication assembly; 14. mounting grooves; 31. a heat conducting wall; 311. a thermally conductive silicone layer; 32. an oil gallery; 33. a sealing block; 34. lubricating oil; 35. an indicator; 331. a guide surface; 332. a sealing surface; 36. a hot melt cavity; 333. a first sealing ring; 361. a hot melt adhesive block; 351. an indicator panel; 352. an indication lever; 353. a second sealing ring; 354. a spring; 355. a plugging rod.

Detailed Description

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

Referring to fig. 1 and 2, the efficient energy-saving rare earth permanent magnet synchronous motor disclosed by the invention comprises a base 10, a casing 1, a stator 11 and a rotor 12, wherein the stator 11 and the rotor 12 are arranged in the casing 1, and a rotating shaft 13 is coaxially fixed on the rotor 12. The end of the rotating shaft 13 extends out of the casing 1, and the rotating shaft 13 is a power output end of the motor. The shaft 13 and the housing 1 are rotatably connected by means of a bearing 2 arranged therebetween. The base 10 is used for installing and fixing a motor, and the motor needs to be installed with the base 10 below the machine shell 1.

Referring to fig. 2 and 3, the bearing 2 includes an outer ring 21, an inner ring 22, balls 23, and an oil seal ring 24, the ball bearings have lower frictional resistance than roller and needle roller type bearings, the oil seal ring 24 is provided on each of both surfaces of the bearing 2, the oil seal ring 24 is located between the outer ring 21 and the inner ring 22, and the oil seal ring 24 protects the balls 23 therein and prevents oil in the bearing 2 from leaking outside. The position of the outer ring 21 departing from the base 10 is provided with an oil filling hole 211, the oil filling hole 211 penetrates through the outer ring 21 along the radial direction of the bearing 2, and the position of the oil filling hole 211 avoids the ball 23 and the oil seal ring 24.

Referring to fig. 4 and 5, the motor further includes a lubricating assembly 3, the lubricating assembly 3 is located above the bearing 2, the lubricating assembly 3 is in a long strip shape, the top of the casing 1 is provided with a mounting groove 14 for the lubricating assembly 3 to be mounted, the mounting groove 14 penetrates downwards into the mounting hole of the bearing 2, the outer ring 21 forms the groove bottom of the mounting groove 14 through the outer ring wall, and the oil filling port 211 is located right at the center of the groove bottom of the mounting groove 14. The lubricating component 3 is disassembled and assembled with the machine shell 1 through bolts, the end part of the lubricating component 3 facing the interior of the machine shell 1 is provided with a heat conducting wall 31, the heat conducting wall 31 is in an inwards concave arc shape, the shape of the heat conducting wall 31 corresponds to the shape of the outer ring wall of the outer ring 21, and the material of the lubricating component 3 positioned on the heat conducting wall 31 is aluminum. When the lubricating component 3 is installed in the installation groove 14, the heat conducting wall 31 abuts against the outer annular wall of the outer ring 21, and the two are in surface contact. The contact surface between the heat conducting wall 31 and the outer ring 21 is coated with a heat conducting silicone layer 311 in advance, the heat conducting silicone is mostly used for CPU heat dissipation, the heat conducting silicone layer 311 can fill the air gap between the heat conducting wall 31 and the outer ring 21, and the heat conducting capacity of the outer ring 21 to the heat conducting wall 31 is improved. The lubricating component 3 can not be freely disassembled and assembled after being installed, and the heat-conducting silicone layer 311 needs to be coated again after the lubricating component 3 is detached from the machine shell 1 every time.

An oil cavity 32 and two sealing blocks 33 are arranged in the lubricating assembly 3, the oil cavity 32 penetrates through the lubricating assembly 3 along the vertical direction, and lubricating oil 34 and an indicating piece 35 are stored in the oil cavity 32. The indicating piece 35 is located above the lubricating oil 34, the two sealing blocks 33 are located below the lubricating oil 34 and at the bottom of the lubricating oil cavity 32, the mutually opposite end faces of the two sealing blocks 33 are respectively provided with a guide surface 331 and a sealing surface 332, the guide surface 331 and the sealing surface 332 are located right above the oil filling port 211 and are close to the oil filling port 211, the sealing blocks 33 are tightly abutted and sealed through the two sealing surfaces 332, and the lubricating oil 34 above cannot flow to the oil filling port 211 through the sealing surfaces 332. The guide surface 331 is located above the seal surface 332, the guide surface 331 is inclined, the guide surfaces 331 of the two seal blocks 33 are combined into an upward flared shape, and the guide surface 331 contacts the lubricant 34 in the lubricant chamber 32.

One side that the seal block 33 deviates from each other is equipped with the hot melt cavity 36 that supplies it to slide into, and hot melt cavity 36 is seted up in lubricating assembly 3, and the size of hot melt cavity 36 can supply seal block 33 to slide into just. The circumferential outer wall of the sealing block 33 is provided with a first sealing ring 333, and the first sealing ring 333 establishes sliding sealing between the hot melting cavity 36 and the lubricating oil cavity 32. The hot melt cavity 36 is internally provided with a solidified hot melt adhesive block 361, the hot melt adhesive block 361 is not filled in the hot melt cavity 36, and the solidified hot melt adhesive block 361 prevents the sealing block 33 from sliding into the hot melt cavity 36. When the hot melt adhesive is in a liquid state, the hot melt adhesive is injected into the hot melt cavity 36 in advance, and after the personnel insert the sealing blocks 33 into the installation positions, the two sealing blocks 33 are dragged to enable the sealing surfaces 332 to abut against each other, so that the hot melt adhesive blocks 361 are formed after the hot melt adhesive is solidified.

The shapes of the sealing block 33 and the hot melt cavity 36 are curved to form a circular arc shape in accordance with the shape of the heat conducting wall 31, the hot melt adhesive block 361 also abuts against the bearing 2, and the heat of the outer ring 21 can be transferred to the hot melt adhesive block 361. The type of the hot melt adhesive block 361 is selected such that the melting temperature is 50-70 ℃, the temperature is higher than the normal operation temperature of the bearing 2 but lower than the failure temperature of the bearing 2, and the specific type of the used hot melt adhesive is selected according to the type of the used bearing 2, so that the temperature of the hot melt adhesive can correspond to the temperature of the bearing 2. After the hot melt adhesive block 361 is melted, the hot melt cavity 36 is partially filled, and the lubricating oil 34 in the lubricating oil cavity 32 can enter the oil filling port 211 through a gap between the two sealing blocks 33.

Indicator 35 is capable of moving in position with the level of lubricant 34 in lubricant chamber 32. The indicator 35 comprises an indicator plate 351 and an indicator rod 352 which are fixedly connected, the indicator plate 351 is a piston plate, the indicator plate 351 establishes sliding seal with the inner wall of the lubricating oil cavity 32 through a sealing ring 353 arranged on the outer peripheral wall, and the indicator plate 351 is tightly attached to the upper liquid level of the lubricating oil 34 in the lubricating oil cavity 32 through the lower plate surface. The indicator plate 351 is made of a lightweight plastic, and the indicator plate 351 floats on the lubricant 34. One end of the indication lever 352 is fixed to the center of the top surface of the indication plate 351, and the other end of the indication lever 352 extends upward and out of the lubrication assembly 3 and the cabinet 1. A spring 354 is arranged on one side of the piston plate, which is away from the lubricating oil 34, the spring 354 is sleeved outside the indicating rod 352, and the elastic force of the spring 354 drives the piston plate to press the lubricating oil 34.

The indicator 35 includes a stopper rod 355 facing the oil filler port 211, the stopper rod 355 extending lengthwise through the oil filler port 211, the stopper rod 355 having the same diameter as the oil filler port 211. When a sufficient amount of lubricating oil 34 is stored between the indicator plate 351 and the seal block 33, the blocking rod 355 is positioned in the lubricating oil 34 and does not contact with the seal block 33; when the lubricant 34 enters the lubricant inlet 211, the height of the indicator plate 351 is lowered with the lubricant 34, and the blocking lever 355 is further inserted into the lubricant inlet 211 to block the lubricant inlet 211.

The working conditions of the motor are as follows: the bearing 2 is pre-filled with lubricating oil, and the lubricating oil in the bearing 2 can be used for a long time due to the blocking of the oil seal ring 24. Under the normal working condition of the motor, the bearing 2 rotates under good lubrication condition, the heat of the bearing 2 is not enough to melt the hot melt adhesive block 361, and the lubricating oil 34 in the lubricating assembly 3 is in a waiting state.

When the bearing 2 is operated for a long time or the internal lubricating oil is reduced due to leakage or poor working conditions, the bearing 2 is poorly lubricated, and the temperature at which the bearing 2 rotates is significantly increased. When the temperature of the outer ring 21 rises to a certain value, the heat of the outer ring 21 is transferred to the hot melt adhesive block 361 and is sufficient to melt the hot melt adhesive block 361. After the hot melt adhesive block 361 is melted, the hot melt adhesive block 361 loses the abutting effect on the sealing block 33, and the sealing block 33 is separated from the sealing surface 332. Under the combined action of the self-gravity of the lubricant 34 and the elastic force of the spring 354, the lubricant 34 can generate a component force at the guide surface 331 to separate the two sealing blocks 33, so that the two sealing surfaces 332 can be reliably separated.

The lubricating oil 34 then passes through the gap between the two sealing blocks 33 through the oil filling port 211 into the bearing 2, providing new lubrication to the bearing 2. As the lubricant 34 is injected into the bearing 2, the height position of the indicator 35 is lowered, the length of the indicator rod 352 exposed outside the housing 1 is reduced, and a person can visually recognize the phenomenon when passing through the housing, and thus, whether the bearing 2 has undergone high-temperature operation or not can be determined, and whether the lubricating unit 3 has failed to operate or not can be determined. Since the bearing 2 is filled with a sufficient amount of the lubricating oil 34, the bearing 2 can continue to operate normally for a long time, which is observed by a sufficient person for inspection. When the indicator 35 moves down to the dead point, the stopper rod 355 is inserted into the oil filling port 211 to prevent the oil in the bearing 2 from being thrown back into the oil cavity 32 through the oil filling port 211.

After observing the position change of the indicating rod 352, the person stops the operation of the motor, removes the lubricating assembly 3 from the casing 1, heats the hot melt adhesive block 361 to be melted again, and drags the two sealing blocks 33 to enable the sealing surfaces 332 to be abutted against each other, so that the hot melt adhesive block 361 is formed after the hot melt adhesive is solidified. Then the indicator 35 is taken out, new lubricant 34 is filled into the lubricant chamber 32, the indicator 35 is installed back, and then the lubricating module 3 is installed back in the housing 1, so that the lubricating module 3 is reset and waits for the next automatic use.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. The utility model provides an energy-efficient tombarthite PMSM, includes base (10), casing (1), locates stator (11), rotor (12) in casing (1), rotor (12) coaxial fixation has pivot (13), pivot (13) and casing (1) are established to rotate through locating bearing (2) between the two and are connected, bearing (2) include outer lane (21), inner circle (22), characterized by: an oil filling port (211) penetrates through the position, deviating from the base (10), of the outer ring (21), a lubricating oil cavity (32) and two sealing blocks (33) are arranged in the shell (1) above the oil filling port (211), lubricating oil (34) is stored in the lubricating oil cavity (32), the two sealing blocks (33) are mutually abutted and separate the oil filling port (211) from the lubricating oil cavity (32), a hot melt cavity (36) for the sealing blocks to slide into is formed in one side, deviating from each other, of each sealing block (33), a solidified hot melt adhesive block (361) is arranged in each hot melt cavity (36), and each solidified hot melt adhesive block (361) prevents the sealing block (33) from sliding into each hot melt cavity (36);

the hot melt adhesive block (361) abuts against the bearing (2), and the heat of the outer ring (21) can be transferred to the hot melt adhesive block (361); the melting temperature of the hot melt adhesive block (361) is 50-70 ℃, the hot melt adhesive block (361) is partially filled in the hot melt cavity (36) after being melted, a gap is formed between the two sealing blocks (33) under the pressure of lubricating oil (34), and the lubricating oil (34) in the lubricating oil cavity (32) can enter the oil filling port (211) through the gap between the two sealing blocks (33);

an indicating piece (35) is arranged in the lubricating oil cavity (32), the position of the indicating piece (35) moves along with the liquid level of lubricating oil (34) in the lubricating oil cavity (32), and the end part of the indicating piece (35) extends out of the machine shell (1).

2. The high-efficiency energy-saving rare earth permanent magnet synchronous motor according to claim 1, characterized in that: the machine shell (1) is provided with a detachable lubricating component (3), and the lubricating oil cavity (32), the indicator, the hot melt adhesive block (361), the sealing block (33) and the hot melt cavity (36) are all positioned in the lubricating component (3); the lubricating device is characterized in that the machine shell (1) is provided with a mounting groove (14) for mounting the lubricating component (3), the outer ring wall of the outer ring (21) forms the groove bottom of the mounting groove (14), the end part, facing the interior of the machine shell (1), of the lubricating component (3) is provided with a heat conducting wall (31), the shape of the heat conducting wall (31) corresponds to that of the outer ring wall of the outer ring (21), and the heat conducting wall (31) is abutted against the outer ring (21).

3. The high-efficiency energy-saving rare earth permanent magnet synchronous motor according to claim 2, characterized in that: the shapes of the sealing block (33) and the hot melting cavity (36) are bent to form a circular arc shape according to the shape of the heat conducting wall (31), and a heat conducting silicone grease layer (311) is arranged between the heat conducting wall (31) and the outer ring (21).

4. The high-efficiency energy-saving rare earth permanent magnet synchronous motor according to claim 1, characterized in that: and a first sealing ring (333) is arranged on the circumferential outer wall of the sealing block (33), and the first sealing ring (333) establishes sliding sealing between the hot melting cavity (36) and the oil sliding cavity (32).

5. The high-efficiency energy-saving rare earth permanent magnet synchronous motor according to claim 1, characterized in that: the indicating piece (35) comprises an indicating plate (351) and an indicating rod (352) which are fixedly connected, the indicating plate (351) is tightly attached to the upper liquid level of the lubricating oil (34) in the lubricating oil cavity (32) through the lower plate surface, the indicating plate (351) floats on the lubricating oil (34), and the end part of the indicating rod (352) departing from the indicating plate (351) extends out of the machine shell (1).

6. The efficient energy-saving rare earth permanent magnet synchronous motor of claim 5, which is characterized in that: the indicating plate (351) is a piston plate, sliding sealing is established between the indicating plate (351) and the inner wall of the lubricating oil cavity (32) through a sealing ring II (353) arranged on the outer peripheral wall, a spring (354) is arranged on one side, departing from the lubricating oil (34), of the piston plate, and the piston plate is driven to compress the lubricating oil (34) through the elastic force of the spring (354).

7. The high-efficiency energy-saving rare earth permanent magnet synchronous motor according to claim 1, characterized in that: the end faces, opposite to each other, of the two sealing blocks (33) are provided with guide surfaces (331) and sealing surfaces (332), the sealing blocks (33) are tightly abutted and sealed through the sealing surfaces (332), the guide surfaces (331) are located above the sealing surfaces (332), the two guide surfaces (331) are combined into an upward flaring shape, and the guide surfaces (331) are in contact with lubricating oil (34) in the lubricating oil cavity (32).

8. The efficient energy-saving rare earth permanent magnet synchronous motor of claim 7, which is characterized in that: the indicator (35) comprises a blocking rod (355) facing the oil filling opening (211), the blocking rod (355) being located in the lubricating oil (34) and not being in contact with the sealing block (33); when the lubricating oil (34) enters the oil filling port (211), the blocking rod (355) is inserted into the oil filling port (211) and blocks the oil filling port (211).

9. The high-efficiency energy-saving rare earth permanent magnet synchronous motor according to claim 1, characterized in that: the bearing (2) further comprises an oil seal ring (24), and the oil seal ring (24) is located between the outer ring (21) and the inner ring (22).