Permanent magnet motor rotor and manufacturing method thereof

Abstract

The application discloses a permanent magnet motor rotor, which comprises a rotating shaft, a rotor support and permanent magnet poles, wherein the rotating shaft is provided with a flange, the flange is integrally formed with the rotating shaft, the flange is connected with the rotor support through hydraulic bolts, and the rotating shaft is provided with a laser cladding treated outer circular working surface; a manufacturing method is also disclosed, which comprises the following steps: first, hydraulic bolt holes are arranged on the rotor support and the flange; then, the connection between the rotating shaft and the rotor support is completed; finally, the laser cladding treatment is performed on the outer circular working surface of the rotating shaft. The application can reduce the weight of the permanent magnet motor rotor, improve the machining process of the workpiece and reduce the machining cost under the premise of ensuring the structural reliability, and meanwhile, the wear resistance and corrosion resistance of the rotating shaft and the working surface of the grounding brush are enhanced.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and in particular relates to a permanent magnet motor rotor and a manufacturing method thereof. Background Art

[0002] The rotor is an important component of the permanent magnet motor, and its reliability and weight indicators are often required to be high in order to meet technical requirements and ensure the normal operation of the motor.

[0003] The rotor of a large or medium-sized permanent magnet motor primarily consists of a rotor bracket, a rotating shaft, and permanent magnet poles. When using a traditional rotor bracket-to-shaft shrink-fit design, the connection between the shaft and rotor bracket uses an interference fit and is designed to be relatively thick, which increases the weight of the motor rotor. Furthermore, shrink-fitting the rotor bracket onto the shaft increases the difficulty and cost of subsequent machining of the entire workpiece. Furthermore, the friction area between the conventional shaft and the grounding brush is prone to rust, causing the grounding brush to wear excessively quickly and damaging the shaft surface due to constant rust removal.

[0004] Therefore, designing a permanent magnet motor rotor with high reliability, light weight and good processing technology becomes the key to solving the problem. Summary of the Invention

[0005] In view of the above situation and current situation, one of the objects of the present invention is to provide a permanent magnet motor rotor to reduce the weight of the rotor and reduce the processing cost under the premise of reliable connection between the rotating shaft and the rotor bracket, while enhancing the wear resistance and corrosion resistance of the working surface of the rotating shaft and the grounding brush.

[0006] The technical solution adopted by the present invention to solve its technical problem is: a permanent magnet motor rotor, including a rotating shaft, a rotor bracket and permanent magnet poles, the rotating shaft is provided with a flange, the flange and the rotating shaft are integrally formed, the flange is connected to the rotor bracket through hydraulic bolts, and the rotating shaft has an outer cylindrical working surface treated with laser cladding.

[0007] The permanent magnet motor rotor has a clearance fit between its flange and the rotor bracket, and is fastened with bolts, nuts and washers after being put into place.

[0008] In the permanent magnet motor rotor, Nord-Lock washers are used between the nut and the mating surfaces of the flange and the rotor bracket to prevent loosening.

[0009] The hydraulic bolts of the permanent magnet motor rotor have surfaces that have been subjected to a nitriding and blackening treatment process for corrosion resistance.

[0010] In the permanent magnet motor rotor, the bolt holes on the flange and the rotor bracket are pin holes that have been hinged.

[0011] The described permanent magnet motor rotor has an outer cylindrical working surface of the rotating shaft laser-coated with Stellite 6# (Co106f) material, so that the Stellite 6# material and the surface layer of the workpiece substrate are melted simultaneously, and a surface coating is formed that is metallurgically bonded with the substrate material.

[0012] A second object of the present invention is to provide a method for manufacturing a permanent magnet motor rotor, comprising the following steps:

[0013] S1: Number the bolt holes on the rotor bracket and flange after machining, then drive pins into symmetrical positions and ream the bolt holes. After ream-ing, check the size of the bolt holes and record them by number. Then tighten them with the corresponding fasteners. After ream-ing, grind the hydraulic bolts according to the size of the hydraulic bolt holes.

[0014] S2. Place a hydraulic bolt on the bolt hole and use a tool and hydraulic pump to assist in tightening the hydraulic bolt. Connect and tighten the rotor bracket and flange with the hydraulic bolt. Pull the stud of the hydraulic bolt axially to expand the conical surface of the stud's outer sleeve so that the entire bolt is radially tightly fitted with the surface of the hinged bolt hole. After assembly, check the assembly of the hydraulic bolt.

[0015] S3, laser cladding Stellite 6# (Co106f) material on the working surface of the shaft, so that the Stellite 6# material and the surface layer of the workpiece substrate are melted at the same time, and metallurgical bonding with the substrate material is achieved.

[0016] The beneficial effects of the present invention are as follows: the present invention can reduce the weight of the permanent magnet motor rotor, improve the processing technology of the workpiece and reduce the processing cost while ensuring the structural reliability, and at the same time enhance the wear resistance and corrosion resistance of the working surface of the shaft and the grounding brush. The present invention can be applied to the fields of shipbuilding, industrial and mining industries, petrochemical industry and national defense equipment, and is particularly suitable for large and medium-sized permanent magnet motors in situations where high reliability and weight indicators are required. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the present invention;

[0018] Figure 2 It is a side view of the present invention.

[0019] The reference numerals are: 1—rotating shaft, 2—rotor bracket, 3—hydraulic bolt. Implementation Method

[0020] The following further illustrates the implementation of the present invention with reference to specific examples and accompanying drawings.

[0021] Reference Figure 1 、 Figure 2As shown, the present invention discloses a permanent magnet motor rotor, comprising a rotating shaft 1, a rotor bracket 2 and permanent magnet poles, wherein a flange is provided on the rotating shaft 1, and the flange is integrally formed with the rotating shaft 1, and the flange is connected to the rotor bracket 2 through a hydraulic bolt 3, wherein the outer cylindrical working surface of the rotating shaft 1 is laser-coated with Stellite 6# (Co106f) material, so that the Stellite 6# material and the surface layer of the workpiece substrate are melted at the same time, and a surface coating metallurgically bonded with the substrate material is realized; there is a clearance fit between the flange and the rotor bracket 2, and after being put into place, bolts, nuts and gaskets are used to tighten them, and Nord-Lock washers are used between the nut and the fitting surface of the flange and the rotor bracket 2 to prevent loosening, and the surface of the hydraulic bolt 3 is anti-corrosive using a nitriding blackening process.

[0022] The bolt holes on the flange and the rotor bracket 2 are pin holes that have been hinged, that is, the hydraulic bolt holes 3 on the rotor bracket 2 and the flange are hinged pin holes after processing.

[0023] The manufacturing method of the permanent magnet motor rotor of the present invention includes the following steps.

[0024] S1, hinge for the hydraulic bolt holes on the flange of rotor bracket 2.

[0025] After the rotor bracket 2 and the shaft 1 are machined and formed, the hydraulic bolt 3 holes are reamed. Before reaming, number all holes and drive pins symmetrically. Remove the corresponding tooling fasteners for each hole. After reaming, check the bolt hole dimensions, record the numbers, and tighten with the corresponding fasteners. After reaming, grind the hydraulic bolt 3 to the hole dimensions.

[0026] S2, connection between the rotating shaft 1 and the rotor support 2.

[0027] After the hydraulic bolt 3 holes on the rotor support 2 and the shaft 1 are hinged, they are connected and tightened using hydraulic bolts 3 to transmit torque and resist impact. The hydraulic bolts 3 employed can axially pull the stud of the hydraulic bolt 3, causing the conical surface of the stud's outer sleeve to expand with the outer sleeve, thereby ensuring a tight radial fit between the entire bolt and the hinged hole surface. This connection structure transmits torque through the shear strength of the bolts and the friction between the flange mating surfaces of the shaft 1 and the rotor support 2 caused by the axial preload of the bolts. The axial preload of the bolts can resist axial impact forces under impact conditions. During assembly of the hydraulic bolts 3, the manufacturer's special tooling and hydraulic pump are used for auxiliary tightening. After assembly, the assembly of the hydraulic bolts 3 is inspected.

[0028] S3, laser cladding treatment of the outer cylindrical working surface of the shaft 1.

[0029] During permanent magnet motor operation, the grounding brushes mounted on the rotor energize the shaft by contacting the outer diameter of the rotating shaft 1, thereby drawing out the shaft current. Due to the long-term operation of the shaft 1 in a salt spray environment, the fatigue strength and corrosion resistance of the working surface deteriorate. Surface corrosion reduces the working surface roughness, accelerating the wear of the grounding brushes and shortening the brush life, which shortens the electrode replacement time. To improve the wear and corrosion resistance of the working surfaces of the shaft 1 and the grounding brushes, a Stellite 6# (Co106f) material is laser-clad on the working surface of the shaft 1. This allows the Stellite 6# material to melt simultaneously with the surface layer of the workpiece substrate, forming a surface coating that is metallurgically bonded to the substrate material.

[0030] The above embodiments are merely illustrative of the principles and effects of the present invention, as well as some embodiments of its application. A person skilled in the art may make several modifications and improvements without departing from the inventive concept of the present invention, and all of these modifications and improvements fall within the scope of protection of the present invention.

Claims

1. A method for manufacturing a permanent magnet motor rotor, characterized in that: The permanent magnet motor rotor comprises a rotating shaft (1), a rotor bracket (2) and a permanent magnet pole, wherein a flange is provided on the rotating shaft (1), the flange and the rotating shaft (1) are integrally formed, the flange is connected to the rotor bracket (2) via a hydraulic bolt (3), the rotating shaft (1) has an outer cylindrical working surface treated by laser cladding, the flange and the rotor bracket (2) are clearance-fitted, and are fastened with a nut and a gasket after being put into place, a Nord-Lock washer is used between the nut and the fitting surface of the flange and the rotor bracket (2) to prevent loosening, the hydraulic bolt (3) has a surface treated by nitriding and blackening, and the bolt holes on the flange and the rotor bracket (2) are pin holes treated by hinged processing; the steps include: S1, numbering the bolt holes on the rotor bracket (2) and the flange after processing, then driving pins, and reaming the bolt holes, removing the tooling fasteners corresponding to each hole when reamed, checking the size of the bolt holes after reamed, recording them by number, tightening them with fasteners, and then grinding the hydraulic bolts (3) according to the hole size of the hydraulic bolts (3); S2, placing a hydraulic bolt (3) on the bolt hole, using a hydraulic pump to assist in tightening the hydraulic bolt (3), connecting and tightening the rotor bracket (2) and the flange through the hydraulic bolt (3), axially pulling the stud of the hydraulic bolt (3), so that the conical surface of the stud outer sleeve is matched with the outer sleeve to expand, so that the entire bolt is closely matched with the surface of the hinged hole in the radial direction, using a tool and a hydraulic pump to assist in tightening when assembling the hydraulic bolt (3), and finally checking the assembly condition of the hydraulic bolt (3); S3, laser cladding the working surface of the rotating shaft (1) with Stellite 6# material, so that the Stellite 6# material and the surface layer of the workpiece substrate are melted at the same time and combined with the substrate material.

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