A combined punching lamination submersible permanent magnet motor unit rotor

Abstract

A combined punching lamination submersible permanent magnet motor unit rotor, the unit rotor comprising high-strength iron core punching laminations, low-leakage magnetic core punching laminations, permanent magnets, end plates A, end plates B and locking rods; the high-strength iron core punching laminations and low-leakage magnetic core punching laminations are alternately stacked, permanent magnets are placed in permanent magnet slots of the high-strength iron core punching laminations and the low-leakage magnetic core punching laminations, end plates A and end plates B are placed on both sides of a structure formed by alternately stacking the high-strength iron core punching laminations and the low-leakage magnetic core punching laminations, the high-strength iron core punching laminations, the low-leakage magnetic core punching laminations, the end plates A and the end plates B are fastened together to form a unit rotor. Compared with a traditional submersible motor unit rotor, the motor of the present invention has the advantages of low magnetic leakage and high power density; under the constraints of the same outer diameter and power, the length is shortened by about 20%, which is conducive to the downhole operation of a submersible electric pump unit (equipped with the motor of the present invention).

Description

Technical Field

[0001] The invention relates to a permanent magnet motor rotor, in particular to a rotor structure of a submersible permanent magnet synchronous motor. Background Art

[0002] Submersible permanent magnet motors have greatly improved the efficiency of submersible electric pumps. In particular, direct-drive submersible motors have eliminated the reducer, improving the reliability of the system, making submersible permanent magnet motors very popular in the oil production field. The slender structure of submersible motors has brought about the difficulty of rotor manufacturing and the low utilization coefficient of permanent magnets.

[0003] In order to solve the problem of high difficulty in manufacturing the rotor of the submersible motor and low utilization coefficient of the permanent magnet, the rotor in the patent (application number 201010253462.6, application number 201310739094.X) adopts a permanent magnet surface-mounted structure, while the slender structure of the submersible motor will make the fragile permanent magnet easily collide with the inside of the stator during assembly and operation, causing the permanent magnet to break. The rotors in the patents (application number 201821173356.5, application number 201820920875.7, application number 201721097916.9) all adopt a permanent magnet built-in structure, which solves the defect of easy breakage of the permanent magnet in the above patents, but in order to ensure mechanical strength, the built-in rotor adopts a wider magnetic isolation bridge, resulting in the defect of more magnetic leakage in the rotor. The patent (application number 201820920875.7) adopts a design scheme in which each pole corresponds to a permanent magnet. Due to the small number of motor poles, there are defects such as large eddy current loss of permanent magnets and low rotor space utilization. The patent (application number 201320121619.9) adopts a solution in which the rotor is slotted with 45# steel, which has the defects of low magnetic conductivity and large eddy current loss. Summary of the invention

[0004] Purpose of the invention: The purpose of the present invention is to provide a submersible permanent magnet motor unit rotor with high permanent magnet utilization, high strength and low eddy current loss, so as to solve the problems existing in the past.

[0005] Technical solution: The present invention is achieved through the following technical solution:

[0006] A combined punching lamination submersible permanent magnet motor unit rotor, the unit rotor comprising a high-strength iron core punching lamination, a low-leakage magnetic core punching lamination, a permanent magnet, an end plate A, an end plate B and a locking rod;

[0007] The high-strength iron core punching sheets and the low-leakage magnetic core punching sheets are alternately stacked, and permanent magnets are placed in the permanent magnet slots of the high-strength iron core punching sheets and the low-leakage magnetic core punching sheets.

[0008] End plates A and B are placed on both sides of a structure formed by alternately laminating high-strength core sheets and low-leakage magnetic core sheets. The high-strength core sheets, low-leakage magnetic core sheets, end plates A and end plates B are fastened together to form a unit rotor.

[0009] Both the high-strength iron core punching sheet and the low-leakage magnetic core punching sheet include permanent magnet slots, magnetic isolation bridges, reinforcing ribs, locking rod holes and positioning slots; reinforcing ribs are formed between two adjacent permanent magnet slots, and magnetic isolation bridges are formed on both sides of the end of the reinforcing rib away from the center of the punching sheet;

[0010] In the low-leakage magnetic core punching sheets: the width of the magnetic isolation bridge H = 0.5mm, the width of the reinforcing rib w = 0.5mm, and in the high-strength core punching sheets: the width of the magnetic isolation bridge H and the width of the reinforcing rib w are designed to be 1-2mm.

[0011] When the number of permanent magnet slots of high-strength core laminations and low-leakage core laminations is Z, the pole pair number p can be all positive integers that can divide Z / 2. For example, when the slot number Z is 16, the pole pair number p can be 8, 4, 2, 1, and the pole number 2p can be 16, 8, 4, 2. During installation, when Z / 2p is 1, the permanent magnets placed in the permanent magnet slots are arranged alternately with N poles and S poles; when Z / 2p is not 1, 3 permanent magnets of the same polarity are placed in adjacent Z / 2p permanent magnet slots to form 1 pole. If the side of the Z / 2p permanent magnets in 1 pole away from the center of the circle is the N pole of the permanent magnet, then the Z / 2p permanent magnets form 1 N pole of the unit rotor, which is called an N pole group unit. If the side of the Z / 2p permanent magnets in 1 pole away from the center of the circle is the S pole of the permanent magnet, then the Z / 2p permanent magnets form 1 S pole of the unit rotor, which is called an S pole group unit. The N pole group unit and the S pole group unit are arranged alternately.

[0012] When high-strength core punching sheets with the same number of slots are designed with different numbers of poles, the width w of the reinforcement rib is determined by the number of permanent magnet slots Z and the number of motor poles 2p. The width w of the reinforcement rib between the N-pole group and the S-pole group is 1 to 2 mm, and the width w of the reinforcement rib within the N-pole group and the S-pole group is smaller than the width w of the reinforcement rib between different poles.

[0013] Both end plate A4 and end plate B5 include locking rod holes and positioning grooves, wherein end plate B5 also includes a clamping groove; the locking rod is placed in the locking rod holes of the high-strength iron core punching sheets and the low-leakage magnetic core punching sheets and the locking rod holes of the end plates A4 and B5 at both ends, and is fastened to the end plates A4 and B5.

[0014] A method for preparing the above-mentioned combined punching lamination submersible permanent magnet motor unit rotor, the method adopts a unit rotor lamination tooling to prepare a combined punching lamination submersible permanent magnet motor unit rotor;

[0015] The lamination tooling of the unit rotor includes a mandrel, a clamping ring, a pressing tube and a positioning rod;

[0016] The spindle comprises a base, a shaft body, a key, a guide rod and a positioning hole; the guide rod and the base are respectively arranged at two ends of the shaft body in the axial direction; the positioning hole is arranged on the guide rod, the key is arranged on the outer side wall of the shaft body and the length direction of the key is parallel to the axial direction of the shaft body;

[0017] The clamping ring comprises a ring body, a positioning body and a clamping claw; the positioning body and the clamping claw are arranged on the outer side wall of the ring body; the ring body is a structure which is sleeved on the guide rod when in use;

[0018] The pressing tube comprises a tube body and a positioning hole; the tube body is a structure that is sleeved on the guide rod and can press the ring body when in use, the positioning hole passes through the side wall of the tube body, and the positioning hole corresponds to the positioning hole of the guide rod when in use;

[0019] The positioning rod comprises a rod shaft and a handle; the handle is connected to the rod shaft and forms an L-shaped or T-shaped structure with the rod shaft.

[0020] Before the unit rotors are prepared for lamination, the unit rotors to be laminated are assembled, wherein the unit rotors to be laminated include high-strength iron core sheets, low-leakage magnetic core sheets, permanent magnets, end plates A, end plates B, a spindle, a clamping ring and a pressing tube;

[0021] The end plate A passes through the guide rod and the shaft body of the spindle in sequence, and the positioning groove of the end plate A corresponds to the key, so that the key passes through the positioning groove of the end plate A, and finally the end plate A is placed on the base;

[0022] High-strength core sheets and low-leakage magnetic core sheets are alternately sleeved on the shaft of the mandrel, and the positioning grooves of the high-strength core sheets and the low-leakage magnetic core sheets correspond to the keys, so that the keys pass through the positioning grooves of the high-strength core sheets and the low-leakage magnetic core sheets;

[0023] The permanent magnets are placed in the permanent magnet slots of the high-strength iron core punching sheets and the low-leakage magnetic core punching sheets;

[0024] Then put the end plate B on the shaft;

[0025] Put the clamping ring on the guide rod of the mandrel, and insert the clamping ring into the positioning groove of the end plate B through its own positioning body, and insert the clamping claw into the clamping groove of the end plate B;

[0026] The pressing tube is sleeved on the guide rod of the mandrel, and the positioning hole on the pressing tube is consistent in direction with the positioning hole on the mandrel, ensuring that after the rotor of the stacking unit is stacked, the rod body of the positioning rod can pass through the positioning hole and the positioning hole at the same time.

[0027] The unit rotors to be stacked are stacked by a hydraulic press or other pressing equipment. When the unit rotors to be stacked are pressed to the designed height, the rod body of the positioning rod is passed through the positioning hole of the pressing tube and the positioning hole of the core shaft for positioning to form a positioned unit rotor, and then the positioned unit rotor is removed from the pressing equipment.

[0028] Place the locking rod in the locking rod holes of the high-strength iron core punchings and low-leakage magnetic core punchings of the positioned unit rotor components and the locking rod holes of the end plates A and B. The locking rods (riveted or bolted) are fastened to the end plates A and B at both ends of the positioned unit rotor. After they are securely fastened, remove the tooling positioning rod, pressing tube, pressing ring and spindle.

[0029] Advantages and effects:

[0030] The specific advantages of the present invention are as follows:

[0031] In order to solve the above problems and technical defects, the present invention proposes a submersible permanent magnet motor unit rotor with a combined punching structure. At the same time, for submersible motors with a small number of poles, the method of using permanent magnet blocks is used to effectively improve the strength of the submersible motor rotor and reduce the eddy current loss of the permanent magnet. The slotted design on the end plate can increase the circulation of motor oil in the motor cavity, which is beneficial to the heat dissipation of the motor.

[0032] In summary, the motor of the present invention has the advantages of low magnetic leakage and high power density compared to the traditional submersible motor unit rotor; under the constraints of the same outer diameter and power, the length is shortened by about 20%, which is beneficial to the downhole operation of the submersible electric pump unit (equipped with the motor of the present invention). BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural diagram of a unit rotor of the present invention;

[0034] Figure 2 is an exploded view of the unit rotor structure of the present invention;

[0035] Figure 3 This is a diagram of high-strength iron core punching sheets of a unit rotor of the present invention (Z / 2p is 1);

[0036] Figure 4 This is a high-permeability core punching diagram of the unit rotor of the present invention (Z / 2p is 1);

[0037] Figure 5 This is a diagram of high-strength iron core punching sheets of a unit rotor of the present invention (Z / 2p is not 1);

[0038] Figure 6 This is a high-permeability core punching diagram of the unit rotor of the present invention (Z / 2p is not 1);

[0039] Figure 7 It is a diagram of the end plate A of the unit rotor of the present invention;

[0040] Figure 8 FIG. 1 is a diagram of an end plate B of a unit rotor of the present invention;

[0041] Fig. 9It is a lamination tooling diagram of the unit rotor of the present invention;

[0042] Fig.10 is a spindle diagram of a unit rotor of the present invention;

[0043] Fig.11 is a clamping ring diagram of a unit rotor of the present invention;

[0044] Fig.12 It is a compression tube diagram of the unit rotor of the present invention;

[0045] Fig.13 is a positioning rod diagram of a unit rotor of the present invention;

[0046] Fig.14 is a diagram of a unit rotor to be laminated of a unit rotor of the present invention;

[0047] Fig.15 1 is a diagram of a positioned unit rotor of the unit rotor of the present invention.

[0048] Description of reference numerals:

[0049] 1. High-strength iron core punching sheet, 2. High-permeability core punching sheet, 3. Permanent magnet, 4. End plate A, 5. End plate B, 6. Locking rod, 7. Stacking tooling, 8. Unit rotor to be stacked, 9. Positioned unit rotor 101. Permanent magnet slot, 102. Magnetic isolation bridge, 103. Reinforcement rib, 104. Locking rod hole, 105. Positioning slot, 106. N pole group unit, 107. S pole group unit, 401. Locking rod hole, 40 2. Positioning groove, 501. Clamping groove, 701. Mandrel, 702. Clamping ring, 703. Pressing tube, 704. Positioning rod, 7011. Base, 7012. Shaft body, 7013. Key, 7014. Guide rod, 7015. Positioning hole, 7021. Ring body, 7022. Positioning body, 7023. Clamping claw, 7031. Tube body, 7032. Positioning hole, 7041. Rod body, 7042. Handle. DETAILED DESCRIPTION

[0050] The present invention will be further described below in conjunction with the accompanying drawings:

[0051] A combined punching lamination submersible permanent magnet motor unit rotor, the unit rotor comprising a high-strength iron core punching lamination 1, a low-leakage magnetic core punching lamination 2, a permanent magnet 3, an end plate A4, an end plate B5 and a locking rod 6;

[0052] The high-strength core sheet 1 and the low-leakage magnetic core sheet 2 are alternately stacked (that is, arranged in an alternating array, that is, a high-strength core sheet 1 is pressed next to a low-leakage magnetic core sheet 2), and permanent magnets 3 are placed in the permanent magnet slots 101 of the high-strength core sheet 1 and the low-leakage magnetic core sheet 2.

[0053] End plates A4 and B5 are placed on both sides of the structure formed by alternately laminating high-strength iron core sheets 1 and low-leakage magnetic core sheets 2. The high-strength iron core sheets 1, the low-leakage magnetic core sheets 2, the end plates A4 and the end plates B5 are fastened together by locking rods 6 to form a unit rotor.

[0054] The high-strength iron core punching sheet 1 and the low-leakage magnetic core punching sheet 2 both comprise permanent magnet slots 101, magnetic isolation bridges 102, reinforcing ribs 103, locking rod holes 104 and positioning slots 105; reinforcing ribs 103 are formed between two adjacent permanent magnet slots 101, and magnetic isolation bridges 102 are formed on both sides of one end of the reinforcing ribs 103 away from the center of the punching sheet (high-strength iron core punching sheet 1 and low-leakage magnetic core punching sheet 2);

[0055] The rotor is composed of two punching sheets with different topological structures. The thickness of the two punching sheets is the same. The difference between the high-strength iron core punching sheet 1 and the low-leakage magnetic core punching sheet 2 is that the width H of the magnetic isolation bridge 102 and the width w of the reinforcing rib 103 of the two punching sheets are different. The punching sheet with the width H of the magnetic isolation bridge 102 = 0.5 mm and the width w of the reinforcing rib 103 = 0.5 mm is called the low-leakage magnetic core punching sheet 2, and the punching sheet with the width H of the magnetic isolation bridge 102 and the width w of the reinforcing rib 103 designed to be 1-2 mm is called the high-strength iron core punching sheet 1, and the specific size of the latter is set according to the mechanical strength requirements. The combination of the two rotor iron core punching sheets with different widths of magnetic isolation bridge (102) and reinforcing rib (103) not only ensures the strength of the rotor, but also appropriately reduces the leakage of the magnetic isolation bridge, thereby improving the utilization rate of the permanent magnet.

[0056] The length of the unit rotor is between 200 and 400 mm.

[0057] The high-strength core sheets 1 and the low-leakage core sheets 2 with the same number of slots (the number of permanent magnet slots 101 ) can be designed with different numbers of poles according to the requirements of the motor speed.

[0058] When the number of permanent magnet slots 101 of the high-strength iron core sheet 1 and the low-leakage magnetic core sheet 2 is Z, the number of pole pairs p can be any positive integer that can divide Z / 2. For example, when the number of slots Z is 16, the number of pole pairs p can be 8, 4, 2, 1, and the number of poles 2p can be 16, 8, 4, 2. During installation, when Z / 2p is 1, the permanent magnets 3 placed in the permanent magnet slots 101 are arranged with N poles and S poles alternately (such as Figure 4); when Z / 2p is not 1, the adjacent Z / 2p permanent magnet slots 101 are filled with permanent magnets 3 of the same polarity to form one pole. If the side of the Z / 2p permanent magnets 3 in one pole away from the center is the N pole of the permanent magnet, then the Z / 2p permanent magnets 3 form one N pole of the unit rotor, which is called an N pole group unit 106. If the side of the Z / 2p permanent magnets 3 in one pole away from the center is the S pole of the permanent magnet, then the Z / 2p permanent magnets 3 form one S pole of the unit rotor, which is called an S pole group unit 107. The N pole group unit 106 and the S pole group unit 107 are arranged alternately. For a submersible permanent magnet motor with a small number of poles, a plurality of permanent magnets 3 are combined into one pole, which not only improves the strength of the unit rotor, but also reduces eddy current loss.

[0059] When the high-strength core punching sheet 1 with the same number of slots is designed with different numbers of poles, the width w of the reinforcing rib 103 is determined by the number Z of the permanent magnet slots 101 and the number of motor poles 2p. The width w of the reinforcing rib 103 between the N-pole group 106 and the S-pole group 107 is generally 1 to 2 mm, and the width w of the reinforcing rib 103 within the N-pole group 106 and the S-pole group 107 is smaller than the width w of the reinforcing rib 103 between different poles.

[0060] Both end plate A4 and end plate B5 include a locking rod hole 401 and a positioning groove 402, wherein end plate B5 also includes a clamping groove 501; the locking rod 6 is placed in the locking rod hole 104 of the high-strength iron core punching sheet 1 and the low-leakage magnetic core punching sheet 2 and the locking rod hole 401 of the end plates A4 and B5 at both ends, and is fastened to the end plates A4 and B5; the unit rotor is fastened to the locking rod 6 through the end plates A4 and B5 to achieve the purpose of fixing the high-strength iron core punching sheet 1 and the low-leakage magnetic core punching sheet 2.

[0061] The method adopts the unit rotor lamination tool 7 to prepare the combined punching sheet submersible permanent magnet motor unit rotor;

[0062] The unit rotor lamination tool 7 comprises a mandrel 701, a clamping ring 702, a pressing tube 703 and a positioning rod 704;

[0063] The spindle 701 comprises a base 7011, a shaft body 7012, a key 7013, a guide rod 7014 and a positioning hole 7015; the guide rod 7014 and the base 7011 are respectively arranged at two ends of the axial direction of the shaft body 7012; the positioning hole 7015 is arranged on the guide rod 7014 (the axial direction of the positioning hole 7015 is perpendicular to the axial direction of the guide rod 7014; the guide rod 7014 is coaxial with the shaft body 7012 and the diameter of the guide rod 7014 is smaller than the diameter of the shaft body 7012), and the key 7013 is arranged on the outer wall of the shaft body 7012 and the length direction of the key 7013 is parallel to the axial direction of the shaft body 7012;

[0064] The clamping ring 702 includes a ring body 7021, a positioning body 7022 and a clamping claw 7023; the positioning body 7022 and the clamping claw 7023 are arranged on the outer side wall of the ring body 7021; the ring body 7021 is a structure that is sleeved on the guide rod 7014 when in use;

[0065] The pressing tube 703 includes a tube body 7031 and a positioning hole 7032; the tube body 7031 is a structure that is sleeved on the guide rod 7014 and can press the ring body 7021 when in use, and the positioning hole 7032 passes through the side wall of the tube body 7031, and when in use, the positioning hole 7032 corresponds to the positioning hole 7015 of the guide rod 7014 (the outer wall diameter of the tube body 7031 is not greater than the outer wall diameter of the ring body 7021);

[0066] The positioning rod 704 includes a rod shaft 7041 and a handle 7042 ; the handle 7042 is connected to the rod shaft 7041 and forms an L-shaped or T-shaped structure with the rod shaft 7041 .

[0067] Before the unit rotors are prepared for lamination, the unit rotors 8 to be laminated are assembled. The unit rotors 8 to be laminated include high-strength iron core sheets 1, low-leakage magnetic core sheets 2, permanent magnets 3, end plates A4, end plates B5, spindles 701, clamping rings 702 and pressing tubes 703.

[0068] The end plate A4 passes through the guide rod 7014 and the shaft body 7012 of the spindle 701 in sequence, and the positioning groove 402 of the end plate A4 corresponds to the key 7013, so that the key 7013 passes through the positioning groove 402 of the end plate A4, and finally the end plate A4 is placed on the base 7011;

[0069] The high-strength core sheet 1 and the low-leakage magnetic core sheet 2 are alternately sleeved on the shaft 7012 of the mandrel 701, and the positioning grooves 105 of the high-strength core sheet 1 and the low-leakage magnetic core sheet 2 correspond to the key 7013, so that the key 7013 passes through the positioning grooves 105 of the high-strength core sheet 1 and the low-leakage magnetic core sheet 2;

[0070] The number of high-strength iron core punching sheets 1 and low-leakage magnetic core punching sheets 2 is determined according to the design length of the rotor unit, the thickness of the punching sheets, and the stacking coefficient; the permanent magnets 3 are placed in the permanent magnet slots 101 of the high-strength iron core punching sheets 1 and the low-leakage magnetic core punching sheets 2;

[0071] Then, the end plate B5 is put on the shaft body 7012;

[0072] The end plate A4, the end plate B5, the high-strength iron core punching sheet 1, and the low-leakage magnetic core punching sheet 2 are positioned on the spindle through their own positioning grooves 402 and 105 and the key 7013 on the spindle 701.

[0073] The clamping ring 702 is sleeved on the guide rod 7014 of the spindle 701, and the clamping ring 702 is inserted into the positioning groove 402 of the end plate B5 through its own positioning body 7022, and the clamping claw 7023 is inserted into the clamping groove 501 of the end plate B5; the clamping ring 702 is positioned by its own positioning body 7022, the clamping claw 7023, the positioning groove 402, and the clamping groove 501 of the end plate B5;

[0074] The pressing tube 703 is sleeved on the guide rod 7014 of the spindle 701, and the positioning hole 7032 on the pressing tube 703 is consistent in direction with the positioning hole 7015 on the spindle 701, ensuring that after the stacking unit rotor 8 is stacked, the rod body 7041 of the positioning rod 704 can pass through the positioning hole 7032 and the positioning hole 7015 at the same time.

[0075] The unit rotor 8 to be stacked is stacked by a hydraulic press or other pressing equipment. When the unit rotor 8 to be stacked is pressed to the designed height, the rod body 7041 of the positioning rod 704 is passed through the positioning hole 7032 of the pressing tube 703 and the positioning hole 7015 of the core shaft 701 for positioning to form a positioned unit rotor 9, and then the positioned unit rotor 9 is removed from the pressing equipment.

[0076] The locking rod 6 is placed in the locking rod hole 104 of the high-strength iron core punching 1 and the low-leakage magnetic core punching 2 of the positioned unit rotor 9 components and the locking rod hole 401 of the end plate A4 and the end plate B5. The locking rod 6 (riveted or bolted) is fastened to the end plate A4 and the end plate B5 at both ends of the positioned unit rotor 8. After they are securely fastened, the tooling positioning rod 704, the pressing tube 703, the pressing ring 702 and the core shaft 701 are removed.

Claims

1. A combined punching submersible permanent magnet motor unit rotor, characterized in that: The unit rotor comprises a high-strength iron core punching sheet (1), a low-leakage magnetic core punching sheet (2), a permanent magnet (3), an end plate A (4), an end plate B (5) and a locking rod (6); The high-strength iron core punching sheets (1) and the low-leakage magnetic core punching sheets (2) are alternately stacked, and permanent magnets (3) are placed in the permanent magnet slots (101) of the high-strength iron core punching sheets (1) and the low-leakage magnetic core punching sheets (2). End plates A (4) and end plates B (5) are placed on both sides of a structure formed by alternately laminating high-strength iron core sheets (1) and low-leakage magnetic core sheets (2); the high-strength iron core sheets (1), the low-leakage magnetic core sheets (2), the end plates A (4) and the end plates B (5) are fastened together to form a unit rotor; The high-strength iron core punching sheet (1) and the low-leakage magnetic core punching sheet (2) both comprise a permanent magnet slot (101), a magnetic isolation bridge (102), a reinforcing rib (103), a locking rod hole (104) and a positioning slot (105); a reinforcing rib (103) is formed between two adjacent permanent magnet slots (101), and a magnetic isolation bridge (102) is formed on both sides of an end of the reinforcing rib (103) away from the center of the punching sheet; In the low-leakage magnetic core punching sheet (2), the width H of the magnetic isolation bridge (102) is 0.5 mm, and the width w of the reinforcing rib (103) is 0.5 mm. In the high-strength magnetic core punching sheet (1), the width H of the magnetic isolation bridge (102) and the width w of the reinforcing rib (103) are designed to be 1-2 mm. When the number of permanent magnet slots (101) of the high-strength iron core punching sheet (1) and the low-leakage magnetic core punching sheet (2) is Z, the pole pair number p can be any positive integer that can divide Z / 2. When Z / 2p is 1, the permanent magnets (3) placed in the permanent magnet slots (101) are arranged alternately with N poles and S poles. When Z / 2p is not 1, permanent magnets (3) of the same polarity placed in adjacent Z / 2p permanent magnet slots (101) form one pole. If Z / 2p permanent magnets (3) in one pole are If the side of the permanent magnet (3) away from the center of the circle is the N pole of the permanent magnet, then the Z / 2p permanent magnets (3) form one N pole of the unit rotor, which is called an N pole group unit (106); if the side of the Z / 2p permanent magnets (3) in one pole away from the center of the circle is the S pole of the permanent magnet, then the Z / 2p permanent magnets (3) form one S pole of the unit rotor, which is called an S pole group unit (107); the N pole group unit (106) and the S pole group unit (107) are arranged alternately; The end plate A (4) and the end plate B (5) both include a locking rod hole (401) and a positioning groove (402), wherein the end plate B (5) also includes a clamping groove (501); the locking rod (6) is placed in the locking rod holes (104) of the high-strength core punching sheet (1) and the low-leakage magnetic core punching sheet (2) and the locking rod holes (401) of the end plates A (4) and B (5) at both ends, and is fastened to the end plates A (4) and B (5).

2. The combined punching lamination submersible permanent magnet motor unit rotor according to claim 1, characterized in that When high-strength core punching sheets (1) with the same number of slots are designed to have different numbers of poles, the width w of the reinforcing rib (103) is determined by the number Z of the permanent magnet slots (101) and the number 2p of motor poles, the width w of the reinforcing rib (103) between the N-pole group (106) and the S-pole group (107) is 1-2 mm, and the width w of the reinforcing rib (103) within the N-pole group (106) and the S-pole group (107) is smaller than the width w of the reinforcing rib (103) between different poles.

3. A method for preparing a combined punching lamination submersible permanent magnet motor unit rotor as claimed in claim 1, characterized in that: The method adopts a unit rotor lamination tool (7) to prepare a combined punching sheet submersible permanent magnet motor unit rotor; The unit rotor lamination tooling (7) comprises a mandrel (701), a clamping ring (702), a pressing tube (703) and a positioning rod (704); The spindle (701) comprises a base (7011), a shaft body (7012), a key (7013), a guide rod (7014) and a positioning hole (7015); the guide rod (7014) and the base (7011) are respectively arranged at two ends of the axial direction of the shaft body (7012); the positioning hole (7015) is arranged on the guide rod (7014), and the key (7013) is arranged on the outer side wall of the shaft body (7012), and the length direction of the key (7013) is parallel to the axial direction of the shaft body (7012); The clamping ring (702) comprises a ring body (7021), a positioning body (7022) and a clamping claw (7023); the positioning body (7022) and the clamping claw (7023) are arranged on the outer side wall of the ring body (7021); the ring body (7021) is a structure that is sleeved on the guide rod (7014) when in use; The pressing tube (703) comprises a tube body (7031) and a positioning hole (7032); the tube body (7031) is a structure that is sleeved on the guide rod (7014) and can press the ring body (7021) when in use; the positioning hole (7032) passes through the side wall of the tube body (7031), and when in use, the positioning hole (7032) corresponds to the positioning hole (7015) of the guide rod (7014); The positioning rod (704) comprises a rod shaft (7041) and a handle (7042); the handle (7042) is connected to the rod shaft (7041) and forms an L-shaped or T-shaped structure with the rod shaft (7041).

4. The method for manufacturing a combined punching lamination submersible permanent magnet motor unit rotor according to claim 3, characterized in that: Before the unit rotors are prepared for lamination, the unit rotors (8) to be laminated are assembled, wherein the unit rotors (8) to be laminated include high-strength iron core sheets (1), low-leakage magnetic core sheets (2), permanent magnets (3), end plates A (4), end plates B (5), a spindle (701), a clamping ring (702) and a pressing tube (703); The end plate A (4) passes through the guide rod (7014) and the shaft body (7012) of the spindle (701) in sequence, and the positioning groove (402) of the end plate A (4) corresponds to the key (7013), so that the key (7013) passes through the positioning groove (402) of the end plate A (4), and finally the end plate A (4) is placed on the base (7011); The high-strength iron core punching sheets (1) and the low-leakage magnetic core punching sheets (2) are alternately sleeved on the shaft body (7012) of the core shaft (701), and the positioning grooves (105) of the high-strength iron core punching sheets (1) and the low-leakage magnetic core punching sheets (2) correspond to the keys (7013), so that the keys (7013) pass through the positioning grooves (105) of the high-strength iron core punching sheets (1) and the low-leakage magnetic core punching sheets (2); The permanent magnet (3) is placed in the permanent magnet slot (101) of the high-strength iron core punching sheet (1) and the low-leakage magnetic core punching sheet (2); Then, put the end plate B (5) on the shaft body (7012); The clamping ring (702) is sleeved on the guide rod (7014) of the spindle (701), the clamping ring (702) is clamped into the positioning groove (402) of the end plate B (5) through its own positioning body (7022), and the clamping claw (7023) is clamped into the clamping groove (501) of the end plate B (5); The pressing tube (703) is sleeved on the guide rod (7014) of the spindle (701), and the positioning hole (7032) on the pressing tube (703) is consistent in direction with the positioning hole (7015) on the spindle (701), ensuring that after the stacking unit rotor (8) is stacked, the rod body (7041) of the positioning rod (704) can pass through the positioning hole (7032) and the positioning hole (7015) at the same time.

5. The method for manufacturing a combined punching lamination submersible permanent magnet motor unit rotor according to claim 4, characterized in that: The unit rotors (8) to be stacked are stacked by means of a hydraulic press or other pressing equipment. When the unit rotors (8) to be stacked are pressed to a designed height, the rod body (7041) of the positioning rod (704) is passed through the positioning hole (7032) of the pressing tube (703) and the positioning hole (7015) of the spindle (701) for positioning, thereby forming a positioned unit rotor (9). The positioned unit rotor (9) is then removed from the pressing equipment.

6. The method for manufacturing a combined punching lamination submersible permanent magnet motor unit rotor according to claim 4, characterized in that: The locking rod (6) is placed in the locking rod hole (104) of the high-strength iron core punching sheet (1) and the low-leakage magnetic core punching sheet (2) of the positioned unit rotor (9) and the locking rod hole (401) of the end plate A (4) and the end plate B (5). The locking rod (6) is fastened to the end plate A (4) and the end plate B (5) at both ends of the positioned unit rotor (9). After being fastened securely, the tooling positioning rod (704), the pressing tube (703), the pressing ring (702) and the spindle (701) are removed.

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