CN118232604B - Rotor assembly of permanent magnet synchronous motor and permanent magnet synchronous motor - Google Patents

Abstract

The present invention belongs to the technical field of permanent magnet synchronous motors, and specifically relates to a rotor assembly of a permanent magnet synchronous motor and a permanent magnet synchronous motor, which include a chamber, wherein the rotor assembly is arranged in the chamber, a through hole is opened on the front side of the chamber, and a notch is opened on the back of the chamber, and the rotor assembly includes a rotor part and a rotating shaft; the rotor part is fixedly installed on the outside of the rotating shaft and is located inside the chamber, and the front end of the rotating shaft is connected to a bearing on the inner wall of the through hole; the notch includes four centering parts, and the four centering parts all include a sleeve, a sliding rod, and a roller, the sleeve is fixedly installed on the inner wall of the notch, and a hole is opened at the end, and a sliding hole is opened in the middle, the sliding rod is slidably connected in the sliding hole, and a groove is opened at the right end, the roller shaft is connected in the groove, and fits with the outer surface of the rotating shaft, and the device solves the problem that the rotor of the current permanent magnet synchronous motor cannot be centered due to the axis center offset when the rotor rotates, resulting in unbalanced rotation of the rotor.

Description

A rotor assembly of a permanent magnet synchronous motor and a permanent magnet synchronous motor

Technical Field

The present invention belongs to the technical field of permanent magnet synchronous motors, and in particular relates to a rotor assembly of a permanent magnet synchronous motor and a permanent magnet synchronous motor.

Background Art

Permanent magnet synchronous motors have a wide range of applications in traditional industries. Under normal working conditions, the rotation axis and geometric axis of the permanent magnet synchronous motor rotor should be the same as the stator axis. However, due to uneven mass distribution or axial eccentricity of some rotors, a chronic torque will be generated when the rotor rotates due to the centrifugal force, causing the rotation axis to deflect, resulting in rotor imbalance and eccentric motion of the motor. At the same time, the permanent magnet synchronous motor will experience bearing wear and shaft bending after long-term operation, causing misalignment of the stator and rotor. This phenomenon has become a problem that people in this field need to solve urgently.

Summary of the invention

The object of the present invention is to provide a rotor assembly of a permanent magnet synchronous motor and a permanent magnet synchronous motor to solve the problems raised in the above background technology.

In order to solve the above technical problems, the present invention provides the following technical solutions: a rotor assembly of a permanent magnet synchronous motor and a permanent magnet synchronous motor, comprising a chamber, wherein the rotor assembly is arranged in the chamber, a through hole is opened on the front side of the chamber, and a notch is opened on the back side of the chamber, wherein the rotor assembly comprises a rotor part and a rotating shaft; the rotor part is fixedly mounted on the outside of the rotating shaft and is located inside the chamber, and the front end of the rotating shaft is connected to a bearing on the inner wall of the through hole; the notch comprises four centering parts, and the four centering parts each comprise a sleeve, a sliding rod, and a roller, the sleeve being fixedly mounted on the inner wall of the notch, and a hole is opened at the end, and a sliding hole is opened in the middle, the sliding rod is slidably connected in the sliding hole, and a groove is opened at the right end, the roller shaft is connected in the groove, and fits with the outer surface of the rotating shaft.

The present invention further illustrates that the notch also includes a pressure part, which includes a pressure chamber, an annular tube, four spheres, a gear, and a rack; the pressure chamber is fixedly installed on the right side of the inner wall of the chamber, the annular tube is located in the holes of the four sleeves, the four spheres are distributed and fixed on the outside of the annular tube, and are slidably connected to the inner walls of the holes, the rack is fixedly installed on the upper right side of the annular tube, the gear bearing is installed on the inner wall of the chamber, and is meshed with the rack; the pressure chamber includes a pressure plate, a connecting rod, and a tooth plate, the pressure plate is slidably connected to the inner wall of the pressure chamber, the tooth plate is fixedly installed above the pressure plate through the connecting rod, and the left side of the tooth plate is meshed with the right side of the gear, and the outer end of the sliding rod is in an arc shape; the bottom of the pressure chamber is connected to the external oil pump pipeline, and an intelligent control system is provided in the external oil pump, and the bottom of the pressure plate is filled with oil.

The present invention further illustrates that the intelligent control system includes a power judgment module and a pressure control module; the power judgment module is electrically connected to the permanent magnet synchronous motor, the power judgment module is electrically connected to the pressure control module, the pressure control module is electrically connected to the external oil pump, the power judgment module is used to judge the real-time operating power of the permanent magnet synchronous motor, and the pressure control module is used to control the operating mode of the external oil pump according to the operating power of the permanent magnet synchronous motor.

The present invention further illustrates that the operation steps of the intelligent control system include: step S1, the permanent magnet synchronous motor runs, and the intelligent control system runs; step S2, judging the real-time operating power of the permanent magnet synchronous motor through the power judgment module, and controlling the suction force of the external oil pump when extracting the oil in the pressure chamber, the frequency of extraction and discharge, and the instantaneous force during extraction according to the real-time operating power of the permanent magnet synchronous motor; step S3, the permanent magnet synchronous motor stops running, and the intelligent control system stops running.

The present invention further illustrates that in step S2: Among them, F is the suction force of the external oil pump when extracting oil in the pressure chamber, F _max is the maximum suction force of the external oil pump, P is the real-time operating power of the permanent magnet synchronous motor, and P _max is the maximum operating power of the permanent magnet synchronous motor.

The present invention further illustrates that in step S2: Wherein, Q is the frequency of the external oil pump when pumping and discharging oil into the pressure chamber, and Q _max is the maximum frequency of the external oil pump when pumping and discharging oil into the pressure chamber.

The present invention further illustrates that in step S2: when P<P _mid , P _mid is the normal operating power of the permanent magnet synchronous motor in a stable state: Fin _is the instantaneous suction force when the external oil pump extracts the oil in the pressure chamber, _Fadd is the additional suction force when the external oil pump extracts the oil in the pressure chamber, _Qmin is the minimum frequency when the external oil pump extracts and discharges the oil into the pressure chamber; when P≥P _mid :

F _instant = F.

The present invention further describes that the rotor assembly is arranged inside the stator assembly.

Compared with the prior art, the beneficial effects achieved by the present invention are as follows: the intelligent control system and rotor assembly adopted by the present invention can not only intermittently center the axis of the rotor efficiently, thereby improving the balance of the rotor, but also when the motor is running at low power, the frequency of the roller squeezing and releasing the rotating shaft is low. In this case, when the external oil pump extracts the oil in the pressure chamber, the instantaneous extraction force is increased under the original extraction force, and the higher the frequency of the roller squeezing and releasing the rotating shaft, the lower the increased instantaneous extraction force, so that the impact force of the roller on the rotating shaft at the beginning is lower, and vice versa.

Under high frequency, the roller strikes the rotating shaft with a small force, which not only knocks off the impurities on the rotating shaft, thereby ensuring the smooth rotation of the rotor, but also reduces the structural collision loss and increases the service life of the structure through multiple small force strikes.

In the low-frequency state, the roller hits the rotating shaft with great force, which can fully knock off the impurities and the low frequency does not cause much damage to the rotating shaft and the roller, thus playing a role in protecting the structure.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

Fig. 1 is a schematic diagram of the overall structure of the present invention;

FIG2 is a schematic structural diagram of a centering portion and a pressure portion of the present invention;

FIG3 is a plan view of a centering portion and a pressure portion of the present invention;

FIG4 is a cross-sectional view of the internal structure of the casing of the present invention;

FIG5 is a cross-sectional view of the internal structure of the pressure chamber of the present invention;

6 is a schematic diagram of the module connection mode of the intelligent control system of the present invention;

In the figure: 1, chamber; 3, notch; 31, sleeve; 32, slide rod; 33, roller; 34, pressure chamber; 341, pressure plate; 342, connecting rod; 343, tooth plate; 35, ring tube; 36, sphere; 37, gear; 38, rack; 4, rotor part; 5, rotating shaft.

DETAILED DESCRIPTION

The following is a non-limiting detailed description of the technical solution of the present invention in conjunction with the preferred embodiments and the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Referring to FIGS. 1-6 , the present invention provides a technical solution: a rotor assembly of a permanent magnet synchronous motor and a permanent magnet synchronous motor, comprising a chamber 1, the rotor assembly is arranged in the chamber 1, a through hole is opened at the front side of the chamber 1, a slot 3 is opened at the back side of the chamber 1, and the rotor assembly comprises a rotor part 4 and a rotating shaft 5;

The rotor part 4 is fixedly mounted on the outside of the rotating shaft 5 and is located inside the chamber 1. The front end of the rotating shaft 5 is connected to the bearing on the inner wall of the through hole.

The slot 3 includes four centering parts, each of which includes a sleeve 31, a slide rod 32, and a roller 33. The sleeve 31 is fixedly installed on the inner wall of the slot 3, and a hole is opened at the end, and a slide hole is opened in the middle. The slide rod 32 is slidably connected in the slide hole, and a groove is opened at the right end. The roller 33 is axially connected in the groove and fits with the outer surface of the rotating shaft 5.

After the permanent magnet synchronous motor is running, the rotor assembly inside it runs at high speed, driving the rotating shaft 5 to rotate at high speed. During the rotation, the roller 33 is brought into contact with the surface of the rotating shaft 5 through the sliding rod 32. The rotation of the rotating shaft 5 drives the roller 33 to rotate, thereby preventing the high-speed rotating rotor and the rotating shaft 5 from generating centrifugal force deviation and bending, playing a centering role, thereby improving the balance of the permanent magnet synchronous motor during operation.

The slot 3 also includes a pressure portion, which includes a pressure chamber 34, a ring tube 35, four balls 36, a gear 37, and a rack 38;

The pressure chamber 34 is fixedly installed on the right side of the inner wall of the chamber 1, the annular tube 35 is located in the holes of the four sleeves 31, the four balls 36 are distributed and fixed on the outside of the annular tube 35, and are slidably connected with the inner wall of the hole, the rack 38 is fixedly installed on the upper right of the annular tube 35, and the gear 37 is bearing-mounted on the inner wall of the chamber 1 and meshes with the rack 38;

The pressure chamber 34 includes a pressure plate 341, a connecting rod 342, and a tooth plate 343. The pressure plate 341 is slidably connected to the inner wall of the pressure chamber 34. The tooth plate 343 is fixedly installed above the pressure plate 341 through the connecting rod 342. The left side of the tooth plate 343 is meshed with the right side of the gear 37. The outer end of the sliding rod 32 is in an arc shape.

The bottom of the pressure chamber 34 is connected to the external oil pump pipeline, and the external oil pump is provided with an intelligent control system, and the bottom of the pressure plate 341 is filled with oil;

When the rotor and the rotating shaft 5 rotate, the external oil pump runs to extract the oil in the pressure chamber 34, thereby generating negative pressure under the pressure plate 341. The negative pressure causes the pressure plate 341 to slide downward along the inner wall of the pressure chamber 34, thereby driving the toothed plate 343 to move downward through the connecting rod 342. The toothed plate 343 drives the gear 37 to rotate clockwise through meshing, and drives the ring tube 35 to rotate through meshing with the rack 38. The ring tube 35 drives the four balls 36 to slide in the hole of the sleeve 31 until the balls 36 contact the outer end arc of the sliding rod 32 and squeeze each other. The sliding rod 32 is forced to drive the roller 33 to squeeze the rotating shaft 5. The external oil pump discharges the oil into the pressure chamber 34 again, which makes the roller 33 disengage from the rotating shaft 5, thereby realizing the centering function of the rotating shaft 5, and by squeezing the rotating shaft 5, the centering effect can be enhanced, and the balance of the rotor is fully improved.

The intelligent control system includes a power judgment module and a pressure control module;

The power judgment module is electrically connected to the permanent magnet synchronous motor, the power judgment module is electrically connected to the pressure control module, the pressure control module is electrically connected to the external oil pump, the power judgment module is used to judge the real-time operating power of the permanent magnet synchronous motor, and the pressure control module is used to control the operating mode of the external oil pump according to the operating power of the permanent magnet synchronous motor.

The operation steps of the intelligent control system include:

Step S1, the permanent magnet synchronous motor runs, and the intelligent control system runs;

Step S2, judging the real-time operating power of the permanent magnet synchronous motor through the power judging module, and controlling the suction force, extraction and discharge frequency, and instantaneous force of the external oil pump when extracting the oil in the pressure chamber 34 according to the real-time operating power of the permanent magnet synchronous motor;

Step S3: the permanent magnet synchronous motor stops running, and the intelligent control system stops running.

In step S2:

Wherein, F is the suction force of the external oil pump when extracting the oil in the pressure chamber 34, F _max is the maximum suction force of the external oil pump, P is the real-time operating power of the permanent magnet synchronous motor, and P _max is the maximum operating power of the permanent magnet synchronous motor;

The higher the real-time operating power of the permanent magnet synchronous motor, the higher the speed of the rotating shaft 5. At this time, the suction force of the external oil pump when extracting the oil in the pressure chamber 34 is greater, and vice versa. On the one hand, the rotating shaft 5 can be positioned to the greatest extent, thereby ensuring the stability of the rotor during rotation. On the other hand, when the operating power is low, the centrifugal force generated by the rotating shaft 5 is small, and the squeezing force of the roller 33 on the rotating shaft 5 is relatively reduced, which not only ensures the smoothness of the rotation of the rotating shaft 5, but also reduces the wear on the structure and plays a centering role.

In step S2:

Wherein, Q is the frequency of the external oil pump when pumping and discharging oil into the pressure chamber 34, and Q _max is the maximum frequency of the external oil pump when pumping and discharging oil into the pressure chamber 34;

The higher the real-time operating power of the permanent magnet synchronous motor, the higher the frequency of the external oil pump extracting and discharging oil into the pressure chamber 34. On the one hand, efficient and high-strength centering can be performed, thereby fully ensuring the balance of the rotor. On the other hand, the roller 33 does not need to be in continuous contact with the rotating shaft 5 after centering, thereby further reducing the friction and wear between the structures.

In step S2:

When P<P _mid , P _mid is the normal operating power of the permanent magnet synchronous motor in a stable state: Fin _is the instantaneous suction force when the external oil pump extracts the oil in the pressure chamber 34, Fadd _is the additional suction force when the external oil pump extracts the oil in the pressure chamber 34, and _Qmin is the minimum frequency when the external oil pump extracts and discharges the oil into the pressure chamber 34;

When P ≥ P _mid : F _instant = F;

When the motor is running at low power, the frequency of the roller 33 squeezing and releasing the rotating shaft 5 is low. In this case, when the external oil pump extracts the oil in the pressure chamber 34, the instantaneous extraction force increases under the original extraction force. The higher the frequency of the roller 33 squeezing and releasing the rotating shaft 5, the lower the increased instantaneous extraction force, so that the impact force of the roller 33 on the rotating shaft 5 at the beginning is lower, and vice versa.

In the high frequency state, the roller 33 strikes the rotating shaft 5 with a small force, which not only ensures that the impurities on the rotating shaft 5 are knocked off, thereby ensuring the smooth rotation of the rotor, but also multiple small force strikes can relatively reduce the collision loss of the structure and increase the service life of the structure;

In the low frequency state, the roller 33 hits the rotating shaft 5 with great force, which can fully knock off the impurities and the low frequency does not cause much damage to the rotating shaft 5 and the roller 33, thus playing a role in protecting the structure.

A permanent magnet synchronous motor comprises a stator assembly and a rotor assembly according to any one of claims 1 to 7, wherein the rotor assembly is arranged inside the stator assembly.

In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents, and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (5)

1. A rotor assembly of a permanent magnet synchronous motor, comprising a chamber (1), characterized in that: the rotor assembly is arranged in the chamber (1), a through hole is opened at the front side of the chamber (1), a slot (3) is opened at the back side of the chamber (1), and the rotor assembly comprises a rotor part (4) and a rotating shaft (5); The rotor part (4) is fixedly mounted on the outside of the rotating shaft (5) and is located inside the chamber (1); the front end of the rotating shaft (5) is connected to a bearing on the inner wall of the through hole; The slot (3) includes four centering parts, each of which includes a sleeve (31), a slide rod (32), and a roller (33). The sleeve (31) is fixedly mounted on the inner wall of the slot (3), and has a hole at the end and a slide hole in the middle. The slide rod (32) is slidably connected in the slide hole and has a groove at the right end. The roller (33) is axially connected in the groove and fits with the outer surface of the rotating shaft (5). The slot (3) also includes a pressure part, which includes a pressure chamber (34), a ring tube (35), four balls (36), a gear (37), and a rack (38). The pressure chamber (34) is fixedly mounted on the right side of the inner wall of the chamber (1); the annular tube (35) is located in the holes of the four sleeves (31); the four balls (36) are distributed and fixed on the outside of the annular tube (35) and are slidably connected to the inner walls of the holes; the rack (38) is fixedly mounted on the upper right side of the annular tube (35); the gear (37) bearing is mounted on the inner wall of the chamber (1) and is meshed with the rack (38); The pressure chamber (34) comprises a pressure plate (341), a connecting rod (342), and a tooth plate (343); the pressure plate (341) is slidably connected to the inner wall of the pressure chamber (34); the tooth plate (343) is fixedly mounted above the pressure plate (341) via the connecting rod (342); the left side of the tooth plate (343) is meshed with the right side of the gear (37); and the outer end of the sliding rod (32) is in an arc shape; The bottom of the pressure chamber (34) is connected to an external oil pump pipeline, and an intelligent control system is provided in the external oil pump. The bottom of the pressure plate (341) is filled with oil, and the intelligent control system includes a power judgment module and a pressure control module; The power judgment module is electrically connected to the permanent magnet synchronous motor, the power judgment module is electrically connected to the pressure control module, the pressure control module is electrically connected to the external oil pump, the power judgment module is used to judge the real-time operating power of the permanent magnet synchronous motor, the pressure control module is used to control the operating mode of the external oil pump according to the operating power of the permanent magnet synchronous motor, and the operating steps of the intelligent control system include: Step S1, the permanent magnet synchronous motor runs, and the intelligent control system runs; Step S2, judging the real-time operating power of the permanent magnet synchronous motor by means of a power judging module, and controlling the suction force, the frequency of extraction and discharge, and the instantaneous force of the external oil pump when extracting the oil in the pressure chamber (34) according to the real-time operating power of the permanent magnet synchronous motor; Step S3: the permanent magnet synchronous motor stops running, and the intelligent control system stops running. 2. A rotor assembly of a permanent magnet synchronous motor according to claim 1, characterized in that: in said step S2: ; in, The suction force of the external oil pump when extracting the oil in the pressure chamber (34) is is the maximum suction force of the external oil pump, is the real-time operating power of the permanent magnet synchronous motor, is the maximum operating power of the permanent magnet synchronous motor. 3. A rotor assembly of a permanent magnet synchronous motor according to claim 2, characterized in that: in said step S2: ; in, is the frequency at which the external oil pump extracts and discharges oil into the pressure chamber (34), It is the maximum frequency of the external oil pump when pumping and discharging oil into the pressure chamber (34). 4. A rotor assembly of a permanent magnet synchronous motor according to claim 3, characterized in that: in said step S2: when hour, The normal operating power of the permanent magnet synchronous motor in a stable state is: , is the instantaneous suction force when the external oil pump extracts the oil in the pressure chamber (34). The external oil pump increases the suction force when extracting the oil in the pressure chamber (34). The minimum frequency at which the external oil pump extracts and discharges oil into the pressure chamber (34); when hour: . 5. A permanent magnet synchronous motor, comprising a stator assembly and a rotor assembly according to any one of claims 1 to 4, characterized in that the rotor assembly is arranged inside the stator assembly.