CN113178967B - High-power high-speed permanent magnet synchronous motor rotor - Google Patents

Abstract

A high-power high-speed permanent magnet synchronous motor rotor belongs to the technical field of motors. The purpose of the present invention is to solve the problem of existing high-power high-speed permanent magnet synchronous motors, such as the small adjustment range of the field weakening control field, the difficulty of fixing and protecting the rotor permanent magnet, the difficulty of adjusting the prestress applied to the permanent magnet, and the large temperature rise of the rotor eddy current loss. high question. The rotor structure designed in this application makes it easy to install, fix and protect the permanent magnets, and can use the radial deformation of the guard plate or bow plate to adjust the prestress acting on the permanent magnets; The circumferential interphase structure of the discharge groove increases the adjustment range of the direct axis inductance and the field weakening control field, reduces the eddy current loss of the rotor, suppresses the temperature rise of the rotor, and improves the reliability of the motor; the end plate can also be used as the conductive end ring of the rotor damping system and Weight-removing parts when the rotor is unbalanced. It is the rotor structure of high-power high-speed permanent magnet synchronous motor.

Description

High-power high-speed permanent magnet synchronous motor rotor

technical field

The invention belongs to the technical field of motors, and in particular relates to a rotor structure of a high-power high-speed permanent magnet synchronous motor.

Background technique

Due to the high speed and high power density of high-speed motors, the geometric size of the motors is much smaller than that of low- and medium-speed motors of the same power, which has become a research hotspot in the field of motors. At present, the application fields of high-speed motors are becoming more and more extensive, such as high-speed grinding machines and other processing machine tools, high-speed flywheel energy storage systems, high-speed centrifugal compressors, blowers, and micro gas turbines for distributed power supply systems to drive high-speed generators. The permanent magnet synchronous motor is most suitable for high-speed motors because of its simple structure, high efficiency and power density, and no excitation loss.

Figure 11 shows the stator and rotor structure of a traditional high-speed permanent magnet synchronous motor. Under the condition of high-speed rotation of high-power high-speed permanent magnet synchronous motor, the rotor will generate a large centrifugal force. Considering the high compressive strength of the permanent magnet material and the limited tensile strength (generally ≤80MPa), it is mainly through the outer surface of the permanent magnet. Install the sheath and apply prestress to the permanent magnet to offset the high-speed centrifugal force and protect the permanent magnet. One of the methods to protect the permanent magnet is to add a high-strength non-magnetic metal sheath outside the permanent magnet, and use interference fit between the permanent magnet and the sheath; another protection method is to use carbon fiber to bind the permanent magnet.

When using a high-strength non-magnetic metal sheath, using the principle of thermal expansion and contraction, it is usually necessary to heat the sheath to a high temperature to increase the diameter of the sheath, and then put it on the outside of the permanent magnet. When the temperature decreases, the diameter of the sheath decreases. , clamped on the permanent magnet to generate prestress. However, the eddy current loss generated by the metal sheath is large, the rotor temperature rises, and the permanent magnet is prone to high-temperature demagnetization, and because the metal sheath is a non-magnetic material, the equivalent air gap of the motor is large, the direct axis inductance is small, and the magnetic field is controlled by weakening The adjustment range is small and the loss is high. At the same time, when the power of the motor is large, the diameter and axial length of the rotor and the size of the permanent magnet are large, and the installation and shrink-fitting process of the permanent magnet is complicated. Carbon fiber binding needs to wind the carbon fiber on the outer surface of the permanent magnet while applying a certain pre-tightening force. The pre-stress generated by this method is small and cannot offset the high-speed centrifugal force.

Contents of the invention

The purpose of the present invention is to solve the existing problems of existing high-power high-speed permanent magnet synchronous motors, such as the small adjustment range of the field weakening control field, the difficulty of fixing and protecting the rotor permanent magnet, the difficulty of adjusting the prestress applied to the permanent magnet, and the large temperature rise of the rotor eddy current loss. For high-level problems, we now provide high-power high-speed permanent magnet synchronous motor rotors.

The first structure:

High-power high-speed permanent magnet synchronous motor rotor, the permanent magnet synchronous motor rotor includes a rotor core, permanent magnets, guard plates, end plates and shafts,

The rotor core is sleeved on the shaft, and the rotor core and the shaft are integrated;

The rotor core is cylindrical. There are 2nP permanent magnet embedding slots on the surface of the rotor core along the axial direction. P is the number of pole pairs of the motor, n≥1. The formed core teeth and permanent magnet embedding slots are along the circumferential direction Arranged alternately in sequence; the width of the tooth tip of the iron core is greater than the width of the tooth body;

The permanent magnets are installed in each permanent magnet embedding through slot along the axial section of the rotor core. The permanent magnets are radially magnetized or radially parallel magnetized, and n adjacent permanent magnets under each pole are embedded in the through slots. The magnetization directions of the permanent magnets are the same, and the magnetization directions of the permanent magnets embedded in the slots under different poles are opposite;

The guard plate is made of high-strength non-magnetic metal material or non-metallic material. The guard plate is long and the thickness in the middle of the guard plate is greater than the thickness of the left and right sides along the width direction; the guard plate is installed in the radial direction of the permanent magnet in the permanent magnet embedding slot. On the outside, the left and right sides of the guard plate are respectively attached to the tops of the iron core teeth on the left and right sides, and a guard plate is installed in each permanent magnet embedding slot;

The end plates are disc-shaped, and the two end plates are sleeved on both ends of the rotating shaft respectively, and are in contact with the axial end faces of the core teeth of the rotor core.

Preferably, the core teeth include 2P wide core teeth and 2P(n-1) narrow core teeth; the center line of the wide core teeth coincides with the axis of the straight shaft of the motor; Body width; n permanent magnets between two adjacent wide core teeth are embedded in the permanent magnets in the through slot. The direction of magnetization is opposite;

The guard plate is an axial full-length structure or an axial segmental structure; there is radial positive pressure between the guard plate and the permanent magnet;

The cross-section of the permanent magnet is rectangular, trapezoidal or fan-shaped;

Both the rotor core and the shaft are made of metal materials with high magnetic permeability;

The end plate is made of high-strength non-magnetic metal material.

Preferably, the widths of the n permanent magnet embedding slots under each pole are equal, and the depths of the n permanent magnet embedding slots under each pole are all the same; The magnetism is the highest, and the residual magnetism of the permanent magnet in the permanent magnet embedded in the slot gradually decreases as it approaches the position between the magnetic poles;

Or the widths of the n permanent magnet embedding slots under each pole are not equal, and the depths of the n permanent magnet embedding slots under each pole are the same; At the position between poles, the width of the permanent magnet embedding slot gradually decreases, and the width of the permanent magnet in the permanent magnet embedding slot changes with the slot width;

Or the widths of the n permanent magnet embedding slots under each pole are equal, and the depths of the n permanent magnet embedding slots under each pole are different; Between positions, the depth of the permanent magnet embedding groove gradually decreases, and the thickness of the permanent magnet in the permanent magnet embedding groove changes with the groove depth;

The cross-section of the permanent magnet is rectangular, trapezoidal or fan-shaped;

Both the rotor core and the shaft are made of metal materials with high magnetic permeability;

The end plate is made of high-strength non-magnetic metal material.

Preferably, the transverse width of the permanent magnet is smaller than the width of the through slot for embedding the permanent magnet, and an axial ventilation slot is formed between the left and right sides of the permanent magnet and the side walls of the core teeth.

Preferably, the permanent magnets are rare-earth permanent magnets or non-rare-earth permanent magnets or a combination of rare-earth permanent magnets and non-rare-earth permanent magnets.

The second structure:

A high-power high-speed permanent magnet synchronous motor rotor, the permanent magnet synchronous motor rotor includes a rotor core, non-magnetic teeth, guard plates, end plates, shafts and permanent magnets,

The rotor core is sleeved on the shaft, and the rotor core and the shaft are integrated;

The rotor core is cylindrical, and there are 2nP non-magnetic tooth insertion slots on the surface of the rotor core along the axial direction, P is the number of pole pairs of the motor, n≥1, and the cross section of the non-magnetic tooth insertion slot is "T" shape , each non-magnetic tooth slot is embedded with a non-magnetic tooth, the non-magnetic tooth is made of high-strength non-magnetic metal material or non-metallic material, 2nP non-magnetic teeth are arranged along the circumferential direction, every adjacent two non-magnetic A permanent magnet embedding slot is opened between the teeth, forming a total of 2nP permanent magnet embedding slots;

The permanent magnets are installed in sections along the axial direction in each permanent magnet embedding slot; the permanent magnets are radially magnetized or radially parallel magnetized; n adjacent permanent magnets under each pole are embedded in the slots. The magnetization direction is the same, and the magnetization directions of the permanent magnets embedded in the slots under different poles are opposite;

The guard plate is made of high rigidity and high magnetic permeability material. The guard plate is long strip shape. The thickness of the guard plate in the middle of the width direction is greater than the thickness of the left and right sides. The guard plate is installed on the radial outer side of the permanent magnet in the permanent magnet embedding slot. The left and right sides are respectively attached to the tops of the non-magnetic teeth on the left and right sides, and a guard plate is installed in each permanent magnet embedding slot;

The end plates are disc-shaped, and the two end plates are sleeved on both ends of the rotating shaft respectively, and are in contact with the end faces of the non-magnetic gear shafts.

Preferably, the widths of the n permanent magnet embedding slots under each pole are equal, and the depths of the n permanent magnet embedding slots under each pole are all the same; The magnetism is the highest, and the residual magnetism of the permanent magnet in the permanent magnet embedded in the slot gradually decreases as it approaches the position between the magnetic poles;

Or the widths of the n permanent magnet embedding slots under each pole are not equal, and the depths of the n permanent magnet embedding slots under each pole are the same; At the position between poles, the width of the permanent magnet embedding slot gradually decreases, and the width of the permanent magnet in the permanent magnet embedding slot changes with the slot width;

Or the widths of the n permanent magnet embedding slots under each pole are equal, and the depths of the n permanent magnet embedding slots under each pole are different; Between positions, the depth of the permanent magnet embedding groove gradually decreases, and the thickness of the permanent magnet in the permanent magnet embedding groove changes with the groove depth;

The cross-section of the permanent magnet is rectangular, trapezoidal or fan-shaped;

Both the rotor core and the shaft are made of metal materials with high magnetic permeability;

The end plate is made of high-strength non-magnetic metal material.

Preferably, the transverse width of the permanent magnet is smaller than the width of the through slot for embedding the permanent magnet, and an axial ventilation slot is formed between the left and right sides of the permanent magnet and the side walls of the core teeth.

The third structure:

High-power high-speed permanent magnet synchronous motor rotor, the permanent magnet synchronous motor rotor includes a rotor core, permanent magnets, end plates and a rotating shaft,

The rotor core is sleeved on the shaft, and the rotor core and the shaft are integrated;

The rotor core is cylindrical, and there are 2nP permanent magnet embedding holes in the axial direction near the end face of the rotor core. P is the number of pole pairs of the motor, n≥1, and the cross section of the permanent magnet embedding holes is fan-shaped. Or trapezoidal, the formed iron core teeth and permanent magnet embedding through holes are arranged alternately along the circumferential direction;

The permanent magnets are installed in each permanent magnet embedding through hole in sections along the axial direction; the permanent magnets are radially magnetized or radially parallel magnetized; n adjacent permanent magnets under each pole are embedded in the permanent magnets in the through holes The magnetization direction is the same, and the magnetization direction of the permanent magnet embedded in the through hole under different poles is opposite;

The end plates are disc-shaped, and the two end plates are sleeved on both ends of the rotating shaft respectively, and are in contact with the axial end surfaces of the core teeth of the rotor core.

Preferably, the core teeth include 2P wide core teeth and 2P(n-1) narrow core teeth; the center line of the wide core teeth coincides with the axis of the straight shaft of the motor; Body width; n permanent magnets between two adjacent wide core teeth are embedded in the permanent magnets in the through slot. The direction of magnetization is opposite;

The guard plate is an axial full-length structure or an axial segmental structure; there is radial positive pressure between the guard plate and the permanent magnet;

The cross-section of the permanent magnet is rectangular, trapezoidal or fan-shaped;

Both the rotor core and the shaft are made of metal materials with high magnetic permeability;

The end plate is made of high-strength non-magnetic metal material.

Preferably, the widths of the n permanent magnet embedding slots under each pole are equal, and the depths of the n permanent magnet embedding slots under each pole are all the same; The magnetism is the highest, and the residual magnetism of the permanent magnet in the permanent magnet embedded in the slot gradually decreases as it approaches the position between the magnetic poles;

Or the widths of the n permanent magnet embedding slots under each pole are not equal, and the depths of the n permanent magnet embedding slots under each pole are the same; At the position between poles, the width of the permanent magnet embedding slot gradually decreases, and the width of the permanent magnet in the permanent magnet embedding slot changes with the slot width;

Or the widths of the n permanent magnet embedding slots under each pole are equal, and the depths of the n permanent magnet embedding slots under each pole are different; Between positions, the depth of the permanent magnet embedding groove gradually decreases, and the thickness of the permanent magnet in the permanent magnet embedding groove changes with the groove depth;

The cross-section of the permanent magnet is rectangular, trapezoidal or fan-shaped;

Both the rotor core and the shaft are made of metal materials with high magnetic permeability;

The end plate is made of high-strength non-magnetic metal material.

Preferably, the transverse width of the permanent magnet is smaller than the width of the through slot for embedding the permanent magnet, and an axial ventilation slot is formed between the left and right sides of the permanent magnet and the side walls of the core teeth.

Preferably, the permanent magnets are rare-earth permanent magnets or non-rare-earth permanent magnets or a combination of rare-earth permanent magnets and non-rare-earth permanent magnets.

The fourth structure:

High-power high-speed permanent magnet synchronous motor rotor, the permanent magnet synchronous motor rotor includes rotor core, permanent magnet, positioning key, sheath, arc plate, end plate and rotating shaft,

The rotor core is sleeved on the shaft, and the rotor core and the shaft are integrated;

The rotor core is cylindrical, and there are 2nP positioning key slots in the axial direction on the surface of the rotor core. P is the number of pole pairs of the motor, n≥1, and the cross section of the positioning key slot is trapezoidal or rectangular. One strip-shaped positioning key, 2nP positioning keys are arranged along the circumferential direction, and a permanent magnet embedding slot is opened between every two adjacent positioning keys, forming a total of 2nP permanent magnet embedding slots;

The arc-shaped plate is elongated, the cross-section of the arc-shaped plate is arc-shaped, and the arc-shaped plate is made of high-rigidity and high-magnetic-permeability materials. An arc-shaped plate is installed at the bottom of the magnet embedding slot;

The permanent magnets are paved in sections along the axial direction on the arc-shaped plate in each permanent magnet embedding slot; the permanent magnets are radially magnetized or radially parallel magnetized; n adjacent permanent magnets are embedded in each pole The magnetization directions of the permanent magnets in the slots are the same, and the magnetization directions of the permanent magnets embedded in the slots under different poles are opposite;

The sheath is cylindrical and fits on the outer surface of the rotor core. The sheath is a variable magnetic structure, and the positioning key is made of magnetic or non-magnetic material;

The end plates are disc-shaped, and the two end plates are sleeved on both ends of the rotating shaft respectively, and are in contact with the axial end faces of the core teeth of the rotor core.

Preferably, the widths of the n permanent magnet embedding slots under each pole are equal, and the depths of the n permanent magnet embedding slots under each pole are all the same; The magnetism is the highest, and the residual magnetism of the permanent magnet in the permanent magnet embedded in the slot gradually decreases as it approaches the position between the magnetic poles;

Or the widths of the n permanent magnet embedding slots under each pole are not equal, and the depths of the n permanent magnet embedding slots under each pole are the same; At the position between poles, the width of the permanent magnet embedding slot gradually decreases, and the width of the permanent magnet in the permanent magnet embedding slot changes with the slot width;

Or the widths of the n permanent magnet embedding slots under each pole are equal, and the depths of the n permanent magnet embedding slots under each pole are different; Between positions, the depth of the permanent magnet embedding groove gradually decreases, and the thickness of the permanent magnet in the permanent magnet embedding groove changes with the groove depth;

The cross-section of the permanent magnet is rectangular, trapezoidal or fan-shaped;

Both the rotor core and the shaft are made of metal materials with high magnetic permeability;

The end plate is made of high-strength non-magnetic metal material.

Preferably, the transverse width of the permanent magnet is smaller than the width of the through slot for embedding the permanent magnet, and an axial ventilation slot is formed between the left and right sides of the permanent magnet and the side walls of the core teeth.

Preferably, the arc-shaped plate is an axially long structure or an axially segmented structure; there is radial positive pressure between the arc-shaped plate and the permanent magnet.

The fifth structure:

A high-power high-speed permanent magnet synchronous motor rotor, the permanent magnet synchronous motor rotor includes a rotor core, a permanent magnet, a sheath, an arc plate, an end plate and a rotating shaft,

The rotor core is sleeved on the shaft, and the rotor core and the shaft are integrated;

The rotor core is cylindrical, and there are 2nP permanent magnet embedding slots on the surface of the rotor core along the axial direction, P is the number of pole pairs of the motor, n≥1, and the formed core teeth and permanent magnet embedding slots are The directions are arranged alternately;

The arc-shaped plate is long and the cross-section of the arc-shaped plate is arc-shaped. It is made of high magnetic permeability material. The transverse width of the arc-shaped plate is smaller than the width of the bottom of the permanent magnet embedding slot. A curved plate is installed at the bottom of the tank;

The permanent magnets are paved in sections along the axial direction on the arc-shaped plate in each permanent magnet embedding slot; the permanent magnets are radially magnetized or radially parallel magnetized; n adjacent permanent magnets are embedded in each pole The magnetization directions of the permanent magnets in the slots are the same, and the magnetization directions of the permanent magnets embedded in the slots under different poles are opposite;

The sheath is cylindrical and fits on the outer surface of the rotor core. The sheath is made of non-magnetic material. The end plates are disc-shaped. touch.

Preferably, the widths of the n permanent magnet embedding slots under each pole are equal, and the depths of the n permanent magnet embedding slots under each pole are all the same; The magnetism is the highest, and the residual magnetism of the permanent magnet in the permanent magnet embedded in the slot gradually decreases as it approaches the position between the magnetic poles;

Or the widths of the n permanent magnet embedding slots under each pole are not equal, and the depths of the n permanent magnet embedding slots under each pole are the same; At the position between poles, the width of the permanent magnet embedding slot gradually decreases, and the width of the permanent magnet in the permanent magnet embedding slot changes with the slot width;

Or the widths of the n permanent magnet embedding slots under each pole are equal, and the depths of the n permanent magnet embedding slots under each pole are different; Between positions, the depth of the permanent magnet embedding groove gradually decreases, and the thickness of the permanent magnet in the permanent magnet embedding groove changes with the groove depth;

The cross-section of the permanent magnet is rectangular, trapezoidal or fan-shaped;

Both the rotor core and the shaft are made of metal materials with high magnetic permeability;

The end plate is made of high-strength non-magnetic metal material.

Preferably, the transverse width of the permanent magnet is smaller than the width of the through slot for embedding the permanent magnet, and an axial ventilation slot is formed between the left and right sides of the permanent magnet and the side walls of the core teeth.

Preferably, the arc-shaped plate is an axially long structure or an axially segmented structure; there is radial positive pressure between the arc-shaped plate and the permanent magnet.

The beneficial effects of the present invention are:

The rotor structure designed in this application makes it easy to install, fix and protect the permanent magnets, and can use the radial deformation of the guard plate or bow plate to adjust the prestress acting on the permanent magnets; Circumferential phase-to-phase structure of through slots increases the adjustment range of direct axis inductance and magnetic field weakening control, reduces rotor eddy current loss, suppresses rotor temperature rise, and improves motor reliability; through permanent magnet embedding slot number selection, permanent magnet Remanence selection, width design or thickness design can increase the sine degree of the air gap magnetic field and the back EMF of the winding, increase the torque density of the motor, reduce the positioning torque and torque fluctuation of the motor; at the same time, the end plate can also be used as a rotor The conductive end ring of the damping system and the weight-removing parts when the rotor is unbalanced, the rotor has a simple structure and good damping performance.

Therefore, the direct-axis synchronous inductance of the high-power high-speed permanent magnet synchronous motor adopting the rotor of the present application is large, and the magnetic field adjustment range is wide; the rotor permanent magnet fixing method is simple, and the preload adjustment is convenient; High; the sine degree of the air gap magnetic field is high, the positioning torque of the motor is small, the torque fluctuation is low, the vibration is small, and the noise is low.

Description of drawings

Fig. 1 is the side view of the high-power high-speed permanent magnet synchronous motor rotor of embodiment 1;

Fig. 2 is the three-dimensional structural diagram of the high-power high-speed permanent magnet synchronous motor rotor of embodiment 1;

Fig. 3 is the structural diagram of guard plate in Fig. 2;

Fig. 4 is the structural diagram of permanent magnet in Fig. 2;

Fig. 5 (a) is the side view of the high-power high-speed permanent magnet synchronous motor rotor of embodiment 2; Fig. 5 (b) is the three-dimensional structure diagram of the high-power high-speed permanent magnet synchronous motor rotor of embodiment 2; Fig. 5 (c) Fig. 5(d) is the structural diagram of the guard plate in Fig. 5(b); Fig. 5(e) is the structural diagram of the permanent magnet in Fig. 5(b); Fig. 5 (f) is the structural diagram of the end plate in Fig. 5 (b);

Fig. 6 (a) is the side view of the high-power high-speed permanent magnet synchronous motor rotor of embodiment 3; Fig. 6 (b) is the three-dimensional structure diagram of the high-power high-speed permanent magnet synchronous motor rotor of embodiment 3; Fig. 6 (c) It is a structural diagram of opening a permanent magnet embedding through hole in the axial direction near the end face of the rotor core; Fig. 6(d) is a structural diagram of the permanent magnet in Fig. 6(b); Fig. 6(e) is Fig. 6(b) ) The structural diagram of the end plate;

Fig. 7 (a) is the side view of the high-power high-speed permanent magnet synchronous motor rotor of embodiment 4; Fig. 7 (b) is the three-dimensional structure diagram of the high-power high-speed permanent magnet synchronous motor rotor of embodiment 4; Fig. 7 (c) It is the structural diagram of slotting on the rotor core;

Fig. 7 (d) is the structural diagram of sheath in Fig. 7 (b); Fig. 7 (e) is the structural diagram of permanent magnet in Fig. 7 (b); Fig. 7 (f) is the structural diagram of arc plate;

Fig. 8 (a) is the side view of the high-power high-speed permanent magnet synchronous motor rotor of embodiment 5; Fig. 8 (b) is the three-dimensional structure diagram of the high-power high-speed permanent magnet synchronous motor rotor of embodiment 5;

Fig. 9 (a) is the side view of the high-power high-speed permanent magnet synchronous motor rotor of embodiment 6; Fig. 9 (b) is the three-dimensional structure diagram of the high-power high-speed permanent magnet synchronous motor rotor of embodiment 6; Fig. 9 (c) It is a structural diagram of opening a permanent magnet embedding through hole on the end face of the rotor core; Fig. 9(d) is a structural diagram of the permanent magnet in Fig. 9(b); Fig. 9(e) is a structural diagram of the guard plate;

Fig. 10 (a) is the side view of the high-power high-speed permanent magnet synchronous motor rotor of embodiment 7; Fig. 10 (b) is the three-dimensional structure diagram of the high-power high-speed permanent magnet synchronous motor rotor of embodiment 7; Fig. 10 (c) It is a structural diagram of opening a permanent magnet embedding through hole axially inside the end face of the rotor core; Fig. 10(d) is a structural diagram of a permanent magnet; Fig. 10(e) is a structural diagram of an end plate;

Fig. 11 is a structure diagram of a stator and a rotor of a traditional high-speed permanent magnet synchronous motor.

Detailed ways

Example 1:

Fig. 1 to Fig. 4 are the high-power high-speed permanent magnet synchronous motor rotor of this embodiment, including rotor core 1, permanent magnet 2, guard plate 3, end plate 4 and rotating shaft 5,

The rotor core 1 is set on the rotating shaft 5, and the rotor core 1 and the rotating shaft 5 are of an integrated structure, using high-strength, high-permeability metal materials;

The rotor core 1 is cylindrical, and there are 10 permanent magnet embedding grooves on the surface of the rotor core 1 along the axial direction. Arrangement; the width of the tip of the core tooth is greater than the width of the tooth body;

The cross section of the permanent magnet 2 is fan-shaped, and the permanent magnet 2 is installed in the permanent magnet embedding slot along the axial direction, and the permanent magnet 2 is magnetized radially or radially parallel; 5 adjacent permanent magnets under each pole The magnetization directions of the permanent magnets 2 in the embedding slots are the same, and the magnetization directions of the permanent magnets 2 in the embedding slots of permanent magnets under different poles are opposite;

The guard plate 3 is made of high-strength non-magnetic metal material or non-metallic material. The guard plate 3 is elongated, and along the width direction, the thickness in the middle is greater than the thickness of the left and right sides; the guard plate 3 is installed in the permanent magnet embedding groove. The radial outer side is installed at the notch, and its left and right sides are respectively embedded in the inner side of the tooth top of the iron core, and a guard plate 3 is installed in each permanent magnet embedding slot;

The end plate 4 is made of high-strength non-magnetic metal material and is disc-shaped. The two end plates 4 are respectively fixed on the axial ends of the rotor core 1, and are in good contact with the axial end surface of the core teeth of the rotor core 1;

The width and depth of the 5 permanent magnet embedding slots under each pole are equal and the same; the residual magnetism of the permanent magnet in the permanent magnet embedding slot at the centerline of the magnetic pole is the highest. The residual magnetism of the medium permanent magnet gradually decreases.

Example 2:

Fig. 5 is the high-power high-speed permanent magnet synchronous motor rotor of this embodiment, including rotor core 1, non-magnetic teeth 6, guard plate 3, end plate 4, rotating shaft 5 and permanent magnet 2;

The rotor core 1 is set on the rotating shaft 5, and the rotor core 1 and the rotating shaft 5 are of an integrated structure, using high-strength, high-permeability metal materials;

The rotor core 1 is cylindrical. On the surface of the rotor core 1, there are 10 non-magnetic tooth insertion slots along the axial direction. The number of pole pairs of the motor is 1. The cross-section of the non-magnetic tooth insertion slot is "T" A non-magnetic tooth 6 is embedded in a non-magnetic tooth embedding groove, and the non-magnetic tooth 6 is made of high-strength non-magnetic metal material or non-metallic material, and 10 non-magnetic teeth are arranged along the circumferential direction, forming 10 permanent magnet inlays Release slot; the cross section of the permanent magnet 2 is fan-shaped, and the permanent magnet 2 is installed in the permanent magnet embedding slot along the axial direction; the permanent magnet 2 is radially magnetized or radially parallel magnetized; 5 under each pole The magnetization directions of the permanent magnets 2 in the adjacent permanent magnet embedding slots are the same, and the magnetization directions of the permanent magnets 2 in the permanent magnet embedding slots under different poles are opposite;

Guard plate 3 adopts high rigidity and high magnetic permeability material, guard plate 3 is elongated, along the width direction, its middle thickness is greater than the thickness of left and right sides; guard plate 3 is installed on the radially outside of the permanent magnet in the permanent magnet embedding slot, That is, it is installed at the notch, and its left and right sides are respectively embedded in the inner side of the top of the non-magnetic tooth, and a guard plate 3 is installed in each permanent magnet embedding slot;

The end plate 4 is made of high-strength non-magnetic metal material and is disc-shaped. The two end plates 4 are respectively fixed on the axial ends of the rotor core, and are in good contact with the axial end surface of the core teeth of the rotor core 1;

The width and depth of the 5 permanent magnet embedding slots under each pole are equal and the same; the residual magnetism of the permanent magnet in the permanent magnet embedding slot at the centerline of the magnetic pole is the highest. The residual magnetism of the middle permanent magnet 2 gradually decreases.

Example 3:

Fig. 6 is the high-power high-speed permanent magnet synchronous motor rotor of this embodiment, including rotor core 1, permanent magnet 2, end plate 3 and rotating shaft 4,

The rotor core 1 is set on the rotating shaft 4, and the rotor core 1 and the rotating shaft 4 are in an integrated structure;

The rotor core 1 is cylindrical, and there are 10 through-holes for embedding permanent magnets in the axial direction near the surface of the rotor core 1. The number of pole pairs of the motor is 1, and the cross-section of the through-holes is fan-shaped. The formed core teeth and The permanent magnet embedding through-holes are alternately arranged along the circumferential direction; the cross-section of the permanent magnet 2 is fan-shaped, and the permanent magnet 2 is installed in the permanent magnet embedding through-holes in sections along the axial direction;

The permanent magnet 2 is magnetized radially or radially parallel; 5 adjacent permanent magnets under each pole are embedded in the through hole, and the magnetization direction of the permanent magnet 2 is the same, and the permanent magnets under different poles are embedded in the through hole. The magnetization direction of 2 is opposite;

The end plate 3 is made of high-strength non-magnetic metal material and is disc-shaped. The two end plates 3 are respectively fixed on the axial ends of the rotor core 1, and are in good contact with the axial end surface of the core teeth of the rotor core 1;

The width and depth of the 5 permanent magnet embedding slots under each pole are equal and the same; the permanent magnet 2 in the permanent magnet embedding slot at the centerline of the magnetic pole has the highest remanence. The residual magnetism of the permanent magnet 2 in the slot gradually decreases.

Example 4:

Fig. 7 is the rotor of the high-power high-speed permanent magnet synchronous motor of this embodiment, including the rotor core 1, the permanent magnet 2, the sheath 3, the arc plate 7, the end plate 4 and the rotating shaft 5;

The rotor core 1 is set on the rotating shaft 5, and the rotor core 1 and the rotating shaft 5 are of an integrated structure; high-strength and high-permeability metal materials are used;

The rotor core 1 is cylindrical, and there are 10 permanent magnet embedding grooves on the surface of the rotor core 1 along the axial direction. arrangement;

The arc-shaped plate 7 is elongated, and its cross-section is arc-shaped. It is made of high rigidity and high magnetic permeability material. Its transverse width is smaller than the width of the bottom of the permanent magnet embedding slot. A curved plate 7 is installed at the bottom;

The cross section of the permanent magnet 2 is fan-shaped, and the permanent magnet 2 is paved on the arc-shaped plate 7 in the permanent magnet embedding slot along the axial direction; the permanent magnet 2 is radially magnetized or radially parallel magnetized; The magnetization directions of the permanent magnets 2 in the five adjacent permanent magnet embedding slots are the same, and the magnetization directions of the permanent magnets 2 in the embedding slots of permanent magnets under different poles are opposite;

The sheath 3 is cylindrical and fitted on the outer surface of the rotor, and the sheath 3 is made of non-magnetic material;

The end plate 4 is made of high-strength non-magnetic metal material and is disc-shaped. The two end plates 4 are respectively fixed on the axial ends of the rotor core 1, and are in good contact with the axial end surface of the core teeth of the rotor core 1;

The width and depth of the 5 permanent magnet embedding slots under each pole are equal and the same; the permanent magnet 2 in the permanent magnet embedding slot at the centerline of the magnetic pole has the highest remanence. The residual magnetism of the permanent magnet 2 in the slot gradually decreases.

Example 5:

Fig. 8 is the high-power high-speed permanent magnet synchronous motor rotor of this embodiment, including rotor core, permanent magnet, guard plate, end plate and rotating shaft;

The rotor core is sleeved on the shaft, and the rotor core and the shaft are of an integrated structure, using high-strength, high-permeability metal materials;

The rotor core is cylindrical, and there are 10 permanent magnet embedding slots on the surface of the rotor core along the axial direction. The number of pole pairs of the motor is 1, and the formed core teeth and permanent magnet embedding slots are arranged alternately along the circumferential direction; The width of the tooth tip of the iron core is greater than the width of the tooth body;

The cross-section of the permanent magnet is fan-shaped, and the permanent magnet is installed in the permanent magnet embedding channel in sections along the axial direction. The permanent magnet is magnetized radially or radially parallel; The magnetization directions of the permanent magnets in the slots are the same, and the magnetization directions of the permanent magnets embedded in the slots under different poles are opposite;

The guard plate is made of high-strength non-magnetic metal material or non-metallic material. The guard plate is strip-shaped, and along the width direction, the thickness in the middle is greater than that of the left and right sides; the guard plate is installed on the radial outside of the permanent magnet in the permanent magnet embedding slot. , which is installed at the notch, the left and right sides of which are respectively embedded in the inner side of the tooth top of the core tooth, and a guard plate is installed in the insertion slot of each permanent magnet;

The end plates are made of high-strength non-magnetic metal material and are disc-shaped. The two end plates are respectively fixed on the axial ends of the rotor core, and are in good contact with the axial end faces of the rotor core teeth;

The width of the 5 permanent magnet embedding slots under each pole is not equal, but the depth is the same; the width of the permanent magnet embedding slot at the centerline of the magnetic pole is the largest, and as it approaches the position between the poles, the width of the permanent magnet embedding slot Decreases gradually; the width of the permanent magnet in the permanent magnet embedding slot changes with the variation of the slot width.

Embodiment 6:

Fig. 9 is the high-power high-speed permanent magnet synchronous motor rotor of this embodiment, including rotor core, permanent magnet, guard plate and end plate;

The rotor core is sleeved on the shaft, and the rotor core and the shaft are of an integrated structure, using high-strength, high-permeability metal materials;

The rotor core is cylindrical, and there are 10 permanent magnet embedded slots on the surface of the rotor core along the axial direction. The number of pole pairs of the motor is 1, and 2 wide core teeth and 8 narrow core teeth are formed after slotting; 2 The wide core teeth 1-1, 8 narrow core teeth 1-2 and the permanent magnet embedding slots are alternately arranged along the circumferential direction; the center line of the wide core teeth 1-1 coincides with the straight axis of the motor; the width of the core teeth is greater than Tooth body width;

The cross section of the permanent magnet is fan-shaped, and the permanent magnet is installed in the permanent magnet embedding slot along the axial direction. The magnetization directions of the permanent magnets embedded in the through slots between the five permanent magnets are the same, and the magnetization directions of the permanent magnets embedded in the through slots on the adjacent sides of each wide core tooth 1-1 are opposite;

The guard plate is elongated, along the width direction, and its middle thickness is greater than the thickness of the left and right sides; the guard plate is installed on the radially outer side of the permanent magnet in the permanent magnet embedding slot, that is, installed at the notch, and its left and right sides are respectively Embedded in the inner side of the tooth top of the iron core, each permanent magnet is installed with a guard plate in the slot;

The end plates are made of high-strength non-magnetic metal material and are disc-shaped. The two end plates are respectively fixed on the axial ends of the rotor core and are in good contact with the axial end faces of the core teeth of the rotor core.

Embodiment 7:

Fig. 10 is the high-power high-speed permanent magnet synchronous motor rotor of this embodiment, including rotor core, permanent magnet, end plate and rotating shaft;

The rotor core is cylindrical, and there are 10 through-holes for embedding permanent magnets in the axial direction near the surface of the rotor core. The number of pole pairs of the motor is 1, and the cross-section of the through-holes is fan-shaped. Core teeth 1-1 and 8 narrow core teeth 1-2; 2 wide core teeth 1-1, 8 narrow core teeth 1-2 and permanent magnet embedding through holes are arranged alternately along the circumferential direction; wide core teeth center The line coincides with the axis of the motor's direct shaft;

The cross section of the permanent magnet is fan-shaped, and the permanent magnet is installed in the through hole of the permanent magnet in sections along the axial direction. The permanent magnet is magnetized radially or radially parallel; The magnetization directions of the permanent magnets in the 5 permanent magnet embedding holes are the same, and the magnetization directions of the permanent magnets in the permanent magnet embedding holes on the adjacent sides of each wide core tooth 1-1 are opposite;

The end plates are made of high-strength non-magnetic metal material and are disc-shaped. The two end plates are respectively fixed on the axial ends of the rotor core and are in good contact with the axial end surface of the rotor core.

Embodiment 8:

High-power high-speed permanent magnet synchronous motor rotor, the permanent magnet synchronous motor rotor includes rotor core, permanent magnet, positioning key, sheath, arc plate, end plate and rotating shaft,

The rotor core is sleeved on the shaft, and the rotor core and the shaft are integrated;

The rotor core is cylindrical, and there are 2nP positioning key slots in the axial direction on the outer circumference of the rotor core. P is the number of pole pairs of the motor, n≥1, and the cross section of the positioning key slot is trapezoidal or rectangular. There is a long bar-shaped positioning key embedded, and 2nP positioning keys are arranged along the circumferential direction, and a permanent magnet embedding slot is opened between every two adjacent positioning keys, forming a total of 2nP permanent magnet embedding slots;

The arc-shaped plate is elongated, the cross-section of the arc-shaped plate is arc-shaped, and the arc-shaped plate is made of high-rigidity and high-magnetic-permeability materials. An arc-shaped plate is installed at the bottom of the magnet embedding slot;

The permanent magnets are paved in sections along the axial direction on the arc-shaped plate in each permanent magnet embedding slot; the permanent magnets are radially magnetized or radially parallel magnetized; n adjacent permanent magnets are embedded in each pole The magnetization directions of the permanent magnets in the slots are the same, and the magnetization directions of the permanent magnets embedded in the slots under different poles are opposite;

The sheath is cylindrical and fits on the outer surface of the rotor core. The sheath is a variable magnetic structure, and the positioning key is made of magnetic or non-magnetic material;

The end plate is made of high-strength non-magnetic metal material, and the end plate is disc-shaped. The two end plates are respectively sleeved at both ends of the rotating shaft, and are in contact with the axial end faces of the core teeth of the rotor core.

Claims (8)

1. A high-power high-speed permanent magnet synchronous motor rotor comprises a rotor iron core (1), a permanent magnet (2), a guard plate (3), an end plate (4) and a rotating shaft (5),

the rotor iron core (1) is sleeved on the rotating shaft (5), and the rotor iron core (1) and the rotating shaft (5) are of an integrated structure;

the rotor iron core (1) is cylindrical, 2nP permanent magnet embedding through grooves are formed in the surface of the rotor iron core (1) along the axial direction, P is the number of pole pairs of a motor, n is larger than or equal to 1, and formed iron core teeth and the permanent magnet embedding through grooves are sequentially and alternately arranged along the circumferential direction; the iron core is characterized in that the width of the tooth top of the iron core is larger than that of the tooth body;

permanent magnets (2) are installed in each permanent magnet embedding through groove in a segmented mode along the axial direction of the rotor iron core (1), the permanent magnets (2) are magnetized in a radial direction or in parallel, the magnetizing directions of the permanent magnets (2) in n adjacent permanent magnet embedding through grooves under each pole are the same, and the magnetizing directions of the permanent magnets (2) in the permanent magnet embedding through grooves under different poles are opposite;

the widths of the n permanent magnet embedding through grooves under each pole are equal, and the depths of the n permanent magnet embedding through grooves under each pole are equal; the remanence of the permanent magnet in the permanent magnet embedding and releasing through groove is highest at the position of the central line of the magnetic pole, and the remanence of the permanent magnet in the permanent magnet embedding and releasing through groove is gradually reduced along with the approach to the position between the poles of the magnetic pole;

or the widths of the n permanent magnet embedding through grooves under each pole are not equal, and the depths of the n permanent magnet embedding through grooves under each pole are the same; the width of the permanent magnet embedding through groove is the largest at the position of the central line of the magnetic pole, the width of the permanent magnet embedding through groove is gradually reduced along with the approach of the position between the poles of the magnetic pole, and the width of the permanent magnet in the permanent magnet embedding through groove is changed along with the change of the groove width;

or the n permanent magnet embedding through grooves under each pole have the same width, and the n permanent magnet embedding through grooves under each pole have different depths; the depth of the permanent magnet embedding through groove is the largest at the center line position of the magnetic pole, the depth of the permanent magnet embedding through groove is gradually reduced along with the approach of the position between the magnetic poles, and the thickness of the permanent magnet in the permanent magnet embedding through groove is changed along with the change of the groove depth;

the cross section of the permanent magnet (2) is rectangular, trapezoidal or fan-shaped;

the rotor iron core (1) and the rotating shaft (5) are made of high-permeability metal materials;

the end plate (4) is made of high-strength non-magnetic metal material;

the guard plate (3) is made of high-strength non-magnetic metal materials or non-metal materials, the guard plate (3) is in a strip shape, and the thickness of the middle of the guard plate (3) in the width direction is larger than the thickness of the left side and the right side; the guard plates (3) are arranged on the radial outer sides of the permanent magnets (2) in the permanent magnet embedding through grooves, the left side and the right side of each guard plate (3) are respectively attached to tooth tops of iron core teeth on the left side and the right side, and one guard plate (3) is arranged in each permanent magnet embedding through groove;

the end plates (4) are disc-shaped, and the two end plates (4) are respectively sleeved at two ends of the rotating shaft (5) and are in axial end face contact with iron core teeth of the rotor iron core (1).

2. A high-power high-speed permanent magnet synchronous motor rotor comprises a rotor iron core (1), nonmagnetic teeth (6), a protective plate (3), an end plate (4), a rotating shaft (5) and a permanent magnet (2),

the rotor iron core (1) is sleeved on the rotating shaft (5), and the rotor iron core (1) and the rotating shaft (5) are of an integrated structure;

the rotor core (1) is cylindrical, 2nP nonmagnetic tooth embedding grooves are axially formed in the surface of the rotor core (1), P is the number of pole pairs of a motor, n is larger than or equal to 1, and the rotor core is characterized in that the cross section of each nonmagnetic tooth embedding groove is T-shaped, a nonmagnetic tooth (6) is embedded in each nonmagnetic tooth embedding groove, the nonmagnetic teeth (6) are made of high-strength nonmagnetic metal materials or nonmetal materials, 2nP nonmagnetic teeth (6) are arranged in the circumferential direction, a permanent magnet embedding through groove is formed between every two adjacent nonmagnetic teeth (6), and 2nP permanent magnet embedding through grooves are formed in total;

the permanent magnets (2) are installed in the permanent magnet embedding through grooves in a segmented mode along the axial direction; the permanent magnet (2) is magnetized in a radial direction or in a radial direction in parallel; the magnetizing directions of the permanent magnets (2) in the n adjacent permanent magnet embedding through grooves under each pole are the same, and the magnetizing directions of the permanent magnets (2) in the permanent magnet embedding through grooves under different poles are opposite;

the widths of the n permanent magnet embedding through grooves under each pole are equal, and the depths of the n permanent magnet embedding through grooves under each pole are equal; the remanence of the permanent magnet in the permanent magnet embedding and releasing through groove is highest at the position of the central line of the magnetic pole, and the remanence of the permanent magnet in the permanent magnet embedding and releasing through groove is gradually reduced along with the approach to the position between the poles of the magnetic pole;

or the widths of the n permanent magnet embedding through grooves under each pole are not equal, and the depths of the n permanent magnet embedding through grooves under each pole are the same; the width of the permanent magnet embedding through groove is the largest at the central line position of the magnetic pole, the width of the permanent magnet embedding through groove is gradually reduced along with the approach of the position between the magnetic poles, and the width of the permanent magnet in the permanent magnet embedding through groove is changed along with the change of the groove width;

or the n permanent magnet embedding through grooves under each pole have the same width, and the n permanent magnet embedding through grooves under each pole have different depths; the depth of the permanent magnet embedding through groove is the largest at the central line position of the magnetic pole, the depth of the permanent magnet embedding through groove is gradually reduced along with the approach of the position between the magnetic poles, and the thickness of the permanent magnet in the permanent magnet embedding through groove is changed along with the change of the groove depth;

the cross section of the permanent magnet (2) is rectangular, trapezoidal or fan-shaped;

the rotor iron core (1) and the rotating shaft (5) are made of high-permeability metal materials;

the end plate (4) is made of high-strength non-magnetic metal material;

the protective plate (3) is made of a high-rigidity high-permeability material, the protective plate (3) is long-strip-shaped, the middle thickness of the protective plate (3) in the width direction is larger than the thicknesses of the left side and the right side, the protective plate (3) is installed on the radial outer side of the permanent magnet (2) in the permanent magnet embedding and placing through groove, the left side and the right side of the protective plate (3) are respectively attached to the top ends of the non-magnetic teeth (6) on the left side and the right side, and one protective plate (3) is installed in each permanent magnet embedding and placing through groove;

the end plates (4) are disc-shaped, and the two end plates (4) are respectively sleeved at the two ends of the rotating shaft (5) and are in contact with the axial end faces of the nonmagnetic teeth (6).

3. A high-power high-speed permanent magnet synchronous motor rotor comprises a rotor iron core (1), a permanent magnet (2), a positioning key, a sheath, an arc-shaped plate (7), an end plate (4) and a rotating shaft (5),

the rotor iron core (1) is sleeved on the rotating shaft (5), and the rotor iron core (1) and the rotating shaft (5) are of an integrated structure;

the rotor core (1) is cylindrical, 2nP positioning key grooves are axially formed in the surface of the rotor core (1), P is the number of pole pairs of a motor, n is larger than or equal to 1, and the rotor core is characterized in that the cross section of each positioning key groove is trapezoidal or rectangular, a strip-shaped positioning key is embedded in each positioning key groove, 2nP positioning keys are arranged along the circumferential direction, a permanent magnet embedding and releasing through groove is formed between every two adjacent positioning keys, and 2nP permanent magnet embedding and releasing through grooves are formed in total;

the arc-shaped plate (7) is in a strip shape, the cross section of the arc-shaped plate (7) is in a circular arc shape, the arc-shaped plate (7) is made of high-rigidity high-permeability materials, the transverse width of the arc-shaped plate (7) is smaller than the width of the bottom of the permanent magnet embedding and releasing through groove, and the arc-shaped plate (7) is installed at the bottom of each permanent magnet embedding and releasing through groove;

the permanent magnets (2) are paved on the arc-shaped plates (7) in the permanent magnet embedding through grooves in a segmented mode along the axial direction; the permanent magnet (2) is magnetized in a radial direction or in a radial direction in parallel; the magnetizing directions of the permanent magnets in the n adjacent permanent magnet embedding through grooves under each pole are the same, and the magnetizing directions of the permanent magnets in the permanent magnet embedding through grooves under different poles are opposite;

the widths of the n permanent magnet embedding through grooves under each pole are equal, and the depths of the n permanent magnet embedding through grooves under each pole are equal; the remanence of the permanent magnet in the permanent magnet embedding through groove is highest at the position of the central line of the magnetic pole, and the remanence of the permanent magnet in the permanent magnet embedding through groove is gradually reduced along with approaching to the position between the magnetic poles;

or the widths of the n permanent magnet embedding through grooves under each pole are not equal, and the depths of the n permanent magnet embedding through grooves under each pole are the same; the width of the permanent magnet embedding through groove is the largest at the position of the central line of the magnetic pole, the width of the permanent magnet embedding through groove is gradually reduced along with the approach of the position between the poles of the magnetic pole, and the width of the permanent magnet in the permanent magnet embedding through groove is changed along with the change of the groove width;

or the n permanent magnet embedding through grooves under each pole have the same width, and the n permanent magnet embedding through grooves under each pole have different depths; the depth of the permanent magnet embedding through groove is the largest at the center line position of the magnetic pole, the depth of the permanent magnet embedding through groove is gradually reduced along with the approach of the position between the magnetic poles, and the thickness of the permanent magnet in the permanent magnet embedding through groove is changed along with the change of the groove depth;

the cross section of the permanent magnet (2) is rectangular, trapezoidal or fan-shaped;

the rotor iron core (1) and the rotating shaft (5) are made of high-permeability metal materials;

the end plate (4) is made of high-strength non-magnetic metal material;

the sheath is cylindrical and is sleeved on the outer surface of the rotor core (1), the sheath is of a variable magnetic structure, and the positioning key is made of a magnetic material or a non-magnetic material;

the end plates (4) are disc-shaped, are respectively sleeved at two ends of the rotating shaft (5) and are in contact with the axial end faces of the iron core teeth of the rotor iron core (1).

4. A high-power high-speed permanent magnet synchronous motor rotor comprises a rotor core (1), a permanent magnet (2), a sheath, an arc-shaped plate (7), an end plate (4) and a rotating shaft (5),

the rotor iron core (1) is sleeved on the rotating shaft (5), and the rotor iron core (1) and the rotating shaft (5) are of an integrated structure;

the rotor iron core (1) is cylindrical, 2nP permanent magnet embedding through grooves are axially formed in the surface of the rotor iron core (1), P is the number of pole pairs of a motor, n is larger than or equal to 1, and formed iron core teeth and the permanent magnet embedding through grooves are sequentially and alternately arranged in the circumferential direction; it is characterized in that the preparation method is characterized in that,

the arc-shaped plate (7) is in a strip shape, the cross section of the arc-shaped plate (7) is in a circular arc shape and is made of high-permeability materials, the transverse width of the arc-shaped plate (7) is smaller than the width of the bottom of the permanent magnet embedding through groove, and one arc-shaped plate (7) is installed at the bottom of each permanent magnet embedding through groove;

the permanent magnets (2) are axially and sectionally paved on the arc-shaped plates (7) in the permanent magnet embedding through grooves; the permanent magnet (2) is magnetized in a radial direction or in a radial direction in parallel; the magnetizing directions of the permanent magnets (2) in the n adjacent permanent magnet embedding through grooves under each pole are the same, and the magnetizing directions of the permanent magnets (2) in the permanent magnet embedding through grooves under different poles are opposite;

the widths of the n permanent magnet embedding through grooves under each pole are equal, and the depths of the n permanent magnet embedding through grooves under each pole are equal; the remanence of the permanent magnet in the permanent magnet embedding and releasing through groove is highest at the position of the central line of the magnetic pole, and the remanence of the permanent magnet in the permanent magnet embedding and releasing through groove is gradually reduced along with the approach to the position between the poles of the magnetic pole;

or the widths of the n permanent magnet embedding through grooves under each pole are not equal, and the depths of the n permanent magnet embedding through grooves under each pole are the same; the width of the permanent magnet embedding through groove is the largest at the position of the central line of the magnetic pole, the width of the permanent magnet embedding through groove is gradually reduced along with the approach of the position between the poles of the magnetic pole, and the width of the permanent magnet in the permanent magnet embedding through groove is changed along with the change of the groove width;

or the widths of the n permanent magnet embedding through grooves under each pole are equal, and the depths of the n permanent magnet embedding through grooves under each pole are different; the depth of the permanent magnet embedding through groove is the largest at the center line position of the magnetic pole, the depth of the permanent magnet embedding through groove is gradually reduced along with the approach of the position between the magnetic poles, and the thickness of the permanent magnet in the permanent magnet embedding through groove is changed along with the change of the groove depth;

the cross section of the permanent magnet (2) is rectangular, trapezoidal or fan-shaped;

the rotor iron core (1) and the rotating shaft (5) are made of high-permeability metal materials;

the end plate (4) is made of high-strength non-magnetic metal material;

the protective sleeve is cylindrical and is sleeved on the outer surface of the rotor iron core (1), the protective sleeve is made of nonmagnetic materials, the end plates (4) are disc-shaped, and the two end plates (4) are respectively sleeved at the two ends of the rotating shaft (5) and are in contact with the axial end faces of the iron core teeth of the rotor iron core (1).

5. The high power high speed PMSM rotor according to claim 1 or 2, characterized in that the core teeth include 2P wide core teeth (1-1) and 2P (n-1) narrow core teeth (1-2); the central line of the wide iron core tooth (1-1) is superposed with the axis of the straight shaft of the motor; the tooth top widths of the wide iron core teeth (1-1) and the narrow iron core teeth (1-2) are larger than the tooth body widths; the magnetizing directions of the permanent magnets (2) in the n permanent magnet embedding through grooves between every two adjacent wide iron core teeth (1-1) are the same, and the magnetizing directions of the permanent magnets (2) in the permanent magnet embedding through grooves on the two adjacent sides of each wide iron core tooth (1-1) are opposite;

the guard plate is of an axial full-length structure or an axial segmented structure; radial positive pressure is generated between the guard plate and the permanent magnet;

the cross section of the permanent magnet (2) is rectangular, trapezoidal or fan-shaped;

the rotor iron core and the rotating shaft are made of high-permeability metal materials;

the end plate is made of high-strength non-magnetic metal material.

6. The high-power high-speed permanent magnet synchronous motor rotor according to claim 5, wherein the permanent magnets are rare earth permanent magnets or non-rare earth permanent magnets or a combination of rare earth permanent magnets and non-rare earth permanent magnets.

7. The high-power high-speed permanent magnet synchronous motor rotor according to any one of claims 1 to 4, wherein the transverse width of the permanent magnet is smaller than the width of the permanent magnet embedding through groove, and axial ventilation grooves are formed between the left side surface and the right side surface of the permanent magnet and the side walls of the iron core teeth.

8. The high-power high-speed permanent magnet synchronous motor rotor according to claim 3 or 4, wherein the arc-shaped plates are of an axial through-length structure or an axial segmented structure; radial positive pressure exists between the arc-shaped plate and the permanent magnet.

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