Screw-free air-insulated rotor

Abstract

The present invention proposes a screw-free air-insulated rotor, which relates to the technical field of permanent magnet synchronous motors. The invention solves the problems of structural instability of conventional rotors due to a connecting and fixing structure, poor rotor magnetic isolation effect, rotor magnetic leakage, and defects of a magnetic isolation bridge. The invention specifically comprises a rotating shaft, a rotor bracket, a magnetic pole and a permanent magnet. The rotor bracket is fixed on the rotating shaft by a key, and a plurality of magnetic poles are arranged in the rotor bracket to form a rotor core. The magnetic pole and the rotor bracket are fixed by plugging and connecting a positioning rod. One end of the positioning rod located outside the rotor bracket is axially positioned by a retaining ring, and the other end of the positioning rod is clamped at the rotor bracket. An air gap for magnetic isolation is provided between the magnetic pole and the rotor bracket, and the gap is larger than the size of the air gap between the stator and the rotor. When positioning and fixing the magnetic pole, the structure does not use any screw connection structure, thereby avoiding the phenomenon of unstable rotor structure caused by structural looseness, etc., and the air magnetic isolation structure has better magnetic isolation performance.

Description

Technical Field

[0001] The invention relates to the technical field of permanent magnet synchronous motors, in particular to a screw-free air-insulated magnetic rotor. Background Art

[0002] The permanent magnet synchronous motor is composed of components such as the stator, rotor and end cover. The stator is basically the same as the ordinary induction motor, and also adopts a laminated structure to reduce the iron loss of the motor during operation. The main difference is the rotor magnetic circuit structure. Different rotor magnetic circuit structures will result in different motor operating performance, control systems, manufacturing processes and applicable occasions. As an important component of the permanent magnet motor, the rotor is of great significance to the operation of the permanent magnet motor. The traditional rotor structure of the permanent magnet synchronous motor adopts an end plate clamping punching structure, which has a complex structure and requires multiple screws to tighten. It is easy for the screws to loosen, posing a safety hazard. At the same time, the built-in tangential rotor structure of the permanent magnet synchronous motor adopts a traditional magnetic isolation bridge structure to limit leakage through the magnetic isolation bridge. The smaller the width of the magnetic isolation bridge, the better the magnetic isolation. However, if the magnetic isolation bridge is too small, the mechanical strength of the punching will deteriorate, affecting the operation of the motor. Summary of the invention

[0003] The present invention overcomes the shortcomings of the prior art and proposes a screw-free air magnetic isolation rotor, thereby solving the problems of poor rotor magnetic isolation effect and rotor magnetic leakage caused by the connection and fixing structure of conventional rotors, as well as the defects of the magnetic isolation bridge.

[0004] In order to achieve the above object, the present invention is implemented through the following technical solutions.

[0005] The screw-free air-insulated magnetic rotor comprises a rotating shaft, a rotor bracket, a magnetic pole and a permanent magnet. The rotor bracket is fixedly mounted on the rotating shaft by a key, a plurality of magnetic poles are arranged in the rotor bracket to form a rotor core, and the permanent magnet is fixedly arranged in a mounting groove between two adjacent magnetic poles; the magnetic pole and the rotor bracket are plugged and fixed by a positioning rod, one end of the positioning rod located outside the rotor bracket is axially positioned by a retaining ring, and the other end of the positioning rod is clamped at the rotor bracket, and the side wall of the rotor bracket is a magnetic-insulating material. An air gap is arranged between the magnetic pole and the rotor bracket, and the air gap is used for magnetic isolation, and the air gap is larger than the size of the air gap between the stator and the rotor.

[0006] Furthermore, the rotor bracket is provided with a positioning hole, the magnetic pole is provided with a connecting hole, the connecting hole and the positioning hole are coaxially arranged, and the positioning rod is inserted into the connecting hole and the positioning hole to connect the magnetic pole and the rotor bracket.

[0007] Furthermore, the cross-sections of the connecting hole, the positioning hole and the positioning rod are non-cylindrical, so as to prevent the magnetic poles from axially rotating in the rotor support.

[0008] In a further optimization, the non-cylindrical shape is a square or a polygon.

[0009] According to further optimization, one end of the positioning rod located outside the rotor bracket is a cylindrical structure, and the remaining part is non-cylindrical, and the non-cylindrical end of the positioning rod is stuck in the rotor bracket.

[0010] Furthermore, it also includes a baffle, which is provided with a through hole corresponding to one cylindrical end of the positioning rod, and one cylindrical end of the positioning rod is provided with a retaining ring groove, and a retaining ring is provided in the retaining ring groove for axial positioning of the positioning rod.

[0011] Furthermore, the baffle is made of non-magnetic material.

[0012] Furthermore, a permanent magnet baffle is provided on the upper end surface of the permanent magnet.

[0013] Furthermore, the side wall of the rotor support is integrated with the main structure of the rotor support by welding or interference connection.

[0014] The beneficial effects of the present invention compared with the prior art are as follows.

[0015] The present invention uses a permanent magnet pressing tool to press the permanent magnet into the slot. After the magnet is pressed and installed, the magnetic baffle is fixed to the rotor bracket with a retaining ring. At the same time, the positioning rod passes through the baffle to achieve axial positioning of the magnetic steel and prevent the axial movement of the magnetic steel. The magnetic baffle is made of non-magnetic conductive material, and the rotor bracket is made of high-strength magnetic isolation material to reduce end magnetic leakage. When positioning and fixing the magnetic pole, this structure does not use any screw connection structure, avoiding the phenomenon of unstable rotor structure caused by loose structure, etc. The magnetic isolation performance of the air magnetic isolation structure is better than that of the magnetic isolation bridge structure. Compared with the traditional built-in tangential structure, this rotor structure has high mechanical strength, reliable stability, lower material cost, simple structure, convenient installation, small magnetic leakage coefficient, and reduced manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the air-magnetic-insulated rotor described in the present invention.

[0017] Figure 2 yes Figure 1 Left view of .

[0018] Figure 3 yes Figure 2 A partial enlarged view of .

[0019] Figure 4 It is a structural schematic diagram of the rotor bracket of the present invention.

[0020] Among them, 1 is the rotating shaft; 2 is the rotor bracket; 3 is the positioning rod; 4 is the rotor punching sheet; 5 is the permanent magnet baffle; 7 is the key; 8 is the baffle; 9 is the shaft retaining ring; 10 is the permanent magnet, 11 is the air magnetic shield, 12 is the first positioning hole, 13 is the second positioning hole, 14 is the baffle mounting hole, and 15 is the baffle ejection hole. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail in conjunction with the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. The technical solutions of the present invention are described in detail below in conjunction with the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.

[0022] like Figure 1 and Figure 2 As shown in FIG. 1 , a novel screw-free air-insulated magnetic rotor structure is shown, which includes a rotating shaft 1, a rotor bracket 2, a positioning rod 3, a sector-shaped magnetic pole 4, a permanent magnet baffle 5, a key 7, a baffle 8, a shaft retaining ring 9, and a permanent magnet 10. The rotor bracket 2 is fixedly mounted on the rotating shaft 1 by the key 7 to achieve circumferential positioning. The rotor bracket 2 is made of high-strength magnetic-insulating material, such as Figure 4As shown, a plurality of first positioning holes 12 and ejection holes 15 are evenly arranged on one end face of the rotor bracket 2, and the first positioning holes 12 and the ejection holes 15 are arranged at intervals in sequence, and a second positioning hole 13 and a baffle mounting hole 14 are evenly arranged on the other end face of the rotor bracket 2, and the second positioning holes 13 and the baffle mounting holes 14 are also arranged at intervals in sequence; the first positioning hole 12 and the second positioning hole 13 are both square holes and have corresponding positions, and are used to install the magnetic pole 4 and plug the positioning rod 3; the baffle mounting hole 14 and the ejection hole 15 have corresponding positions, and are used to install the permanent magnet 10 between the two; the baffle mounting hole 14 is used to install the permanent magnet baffle 5, and the ejection hole 15 is used to eject the permanent magnet 10 when the permanent magnet 10 is disassembled;. The magnetic pole 4 is embedded between the two end faces of the rotor bracket 2 and is provided with a connecting hole, and the connecting hole is coaxially arranged with the first positioning hole 12 and the second positioning hole 13 and has a square cross section. One end of the positioning rod 3 is cylindrical, the main body is square, and the end of the other end is a protruding block structure. The cylindrical end of the positioning rod 3 is inserted into the first positioning hole 12 and the connecting hole in sequence and passes through the second positioning hole 13. The block structure of the positioning rod 3 is inserted into the second positioning hole 13 to connect and fix the magnetic pole 4 with the rotor bracket 2, which acts on positioning and transmitting torque. This special structure of the positioning rod 3 can prevent the relative rotation between the magnetic pole 4, the positioning rod 3 and the rotor bracket 2. The square end of the positioning rod 3 is embedded in the rotor bracket 2 and positioned by the block structure. The positioning rod 3 has an end face with a cylindrical end extending out of the rotor bracket 2, and the end face is equipped with a baffle 8 made of magnetic isolation material, and the baffle 8 is provided with a through hole corresponding to the cylindrical end of the positioning rod 3. The cylindrical end of the positioning rod 3 is provided with a retaining ring groove, and the shaft retaining ring 9 is arranged in the retaining ring groove to axially position the positioning rod 3.

[0023] N positioning rods 3 are connected to N magnetic poles 4, and the magnetic poles 4 are fixed one by one in the end surface positioning of the rotor bracket 2 to assemble a complete rotor core. The magnetic poles 4 are formed by stacking a number of rotor punchings of a certain height and are tightened and fixed by the positioning rods 3. After the magnetic poles 4 are assembled as a whole, they are installed in the groove of the rotor bracket 2. Figure 3As shown, a gap is reserved between the magnetic pole 4 and the rotor support 2 to form an air magnetic barrier 11. The air magnetic barrier 11 is larger than the size of the air gap between the stator and the rotor. A slot is reserved on the left and right positions of each magnetic pole 4, and a permanent magnet fixing slot is formed between two adjacent magnetic poles 4. The upper slot of the permanent magnet fixing slot has a slot width greater than the air gap, so as to achieve the effect of limiting the leakage flux. The permanent magnet 10 is pressed into the slot with a special permanent magnet pressing tool, and the permanent magnet 10 is alternately embedded in the permanent magnet slot according to the N and S poles to form the entire rotor structure. After the magnetic steel is pressed and installed, the baffle 8 is fixed to the rotor support 2 with a shaft retaining ring 9, and the positioning rod 3 passes through the baffle 8 to achieve axial positioning of the magnetic steel and prevent the magnetic steel from axial movement. The permanent magnet baffle 5 is made of non-magnetic conductive material to reduce end leakage. The permanent magnet 10 is pressed by the permanent magnet baffle 5, the baffle 8 and the axial retaining ring 9 to prevent axial movement. The axial retaining ring 9 plays an axial fixing role, eliminating the need for screw tightening and preventing the screws from loosening during use.

[0024] Compared with traditional magnetic isolation bridges or magnetic isolation materials, this structure has better magnetic isolation effect, high mechanical strength, reliable stability, lower material cost, simple structure, easy installation, small leakage coefficient, and reduced manufacturing cost.

[0025] The above content is a further detailed description of the present invention in combination with a specific preferred embodiment. It cannot be determined that the specific embodiments of the present invention are limited to this. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the present invention, which should be regarded as belonging to the present invention and the scope of patent protection determined by the submitted claims.

Claims

1. A screw-free air-insulated magnetic rotor, comprising a rotating shaft (1), a rotor bracket (2), magnetic poles (4) and permanent magnets (10), wherein the rotor bracket (2) is fixedly mounted on the rotating shaft (1) by means of a key (7), a plurality of magnetic poles (4) are arranged in the rotor bracket (2) to form a rotor core, and the permanent magnets (10) are fixedly arranged in a mounting groove between two adjacent magnetic poles (4); characterized in that: The rotor support (2) is provided with a positioning hole, and the magnetic pole (4) is provided with a connecting hole, the connecting hole and the positioning hole are arranged coaxially, and the positioning rod (3) is inserted into the connecting hole and the positioning hole to plug and fix the magnetic pole (4) and the rotor support (2); the cross-sections of the connecting hole and the positioning hole are non-cylindrical, which is used to prevent the magnetic pole (4) from axially rotating in the rotor support (2); one end of the positioning rod (3) located outside the rotor support (2) is a cylindrical structure, and the rest of the part is non-cylindrical, and the non-cylindrical end of the positioning rod (3) is clamped in the rotor support (2); the non-cylindrical shape is square or polygonal; one end of the positioning rod (3) located outside the rotor support (2) is axially positioned by a retaining ring, and the other end of the positioning rod (3) is clamped at the rotor support (2), and the side wall of the rotor support (2) is a magnetic isolation material; an air gap is provided between the magnetic pole (4) and the rotor support (2), the air gap is used for magnetic isolation, and the air gap is larger than the size of the air gap between the stator and the rotor.

2. The screw-free air-insulated rotor according to claim 1, characterized in that: It also comprises a baffle plate (8), wherein the baffle plate (8) is provided with a through hole corresponding to one cylindrical end of the positioning rod (3), and one cylindrical end of the positioning rod (3) is provided with a retaining ring groove, wherein a retaining ring is provided in the retaining ring groove for axially positioning the positioning rod (3).

3. The screw-free air-insulated rotor according to claim 2, characterized in that: The baffle (8) is made of non-magnetic material.

4. The screw-free air-insulated magnetic rotor according to claim 1, characterized in that: The upper end surface of the permanent magnet (10) is provided with a permanent magnet baffle (5).

5. The screw-free air-insulated magnetic rotor according to claim 1, characterized in that: The side wall of the rotor support (2) and the main structure of the rotor support (2) are connected as one body through welding or interference connection.

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