Calculation method for high-saturation motor iron core connection and magnetic performance influence

Abstract

The invention relates to the technical field of welding of magnetic parts in motors, and provides a method for calculating connection and magnetic performance influence of high-saturation motor iron cores, which comprises the following steps of: stacking multiple layers of iron core punching sheets, and calculating a magnetic performance change rate based on a linear formula according to a preset welding number and welding times during laser fusion welding; according to the welding bar number and the welding frequency parameter corresponding to the expected magnetic performance change rate, the multiple layers of iron core punching sheets are connected in a laser fusion welding mode; the number of welding strips is equal to that of welding strips on the outer circle of the iron core. According to the method, the influence of the welding process parameters on the product real object can be evaluated in advance, subsequent real object production is guided, and the iron core manufacturing efficiency is effectively improved in the subsequent real object production in a laser welding mode; compared with an existing high-saturation magnetically soft alloy iron core bonding technology, the iron core manufacturing efficiency is improved by about 300%.

Description

Technical Field

[0001] The invention relates to a method for calculating the connection of a high-saturation motor core and the influence of magnetic properties, and belongs to the technical field of welding magnetic parts in motors. Background Art

[0002] At present, conventional motor cores are mostly made of silicon steel sheets, and the process uses self-fastening, welding or gluing of parts punching sheets. However, for motors with high saturation magnetic properties, since the core is made of soft magnetic alloy materials, affected by the characteristics of the material, without affecting its magnetic properties, this type of high saturation and low magnetic loss motor can only use gluing to connect the parts punching sheets after the core is stacked. For example, the "Research on Amorphous and Nanocrystalline Stator Cores for High-speed Motors" published in the journal "Micro Motors" in Volume 47, Issue 4, 2019, and the invention patent application number CN109474089A "An Amorphous Motor Core and Its Production Method" are briefly introduced.

[0003] The iron core of this type of motor is connected by gluing, which has low reliability. The iron core is prone to fragmentation and cracking after production, and the gluing method has low manufacturing efficiency. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a method for calculating the influence of high-saturation motor core connection and magnetic properties. The method for calculating the influence of high-saturation motor core connection and magnetic properties can evaluate the influence of welding process parameters on the actual product in advance, and effectively improve the efficiency of core production through laser welding.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides a method for calculating the influence of high-saturation motor core connection and magnetic properties. The method comprises the following steps: stacking multiple layers of core punching sheets, calculating the magnetic property change rate based on a linear formula according to a preset number of welding strips and welding times during laser welding, and connecting the multiple layers of core punching sheets by laser welding according to the number of welding strips and welding times parameters corresponding to the expected magnetic property change rate; the number of welding strips is the number of welding strips on the outer circle of the core; the magnetic property change rate includes six items, namely, the magnetic property B400 change rate, the magnetic property B800 change rate, the magnetic property B1600 change rate, the magnetic property B2400 change rate, the magnetic property B4000 change rate, and the magnetic property B8000 change rate.

[0007] The welding times are one or two.

[0008] The core punching sheet is a 1J22 soft magnetic alloy core.

[0009] When the welding number is one, the change rate of the magnetic property B400 is calculated according to y=74.28x+2.556, and the change rate of the magnetic property B800 is calculated according to y=150.8x+1.067, where y is the calculation result and x is the number of welding strips.

[0010] When the welding number is one, the change rate of the magnetic property B1600 is calculated according to y=103.2x+3.226, and the change rate of the magnetic property B2400 is calculated according to y=144.8x+2.680, where y is the calculation result and x is the number of welds.

[0011] When the welding number is one, the change rate of the magnetic property B4000 is calculated according to y=6x+5.964, and the change rate of the magnetic property B8000 is calculated according to y=693x+4, where y is the calculation result and x is the number of welding strips.

[0012] When the welding times are two, the change rate of the magnetic property B400 is calculated according to y=116x-0.745, and the change rate of the magnetic property B800 is calculated according to y=127.1x+0.967, where y is the calculation result and x is the number of welding strips.

[0013] When the welding times are two, the change rate of the magnetic property B1600 is calculated according to y=197.6x+1.629, and the change rate of the magnetic property B2400 is calculated according to y=330x+1.972, where y is the calculation result and x is the number of welding strips.

[0014] When the welding times are two, the change rate of the magnetic property B4000 is calculated according to y=681x+1.968, and the change rate of the magnetic property B8000 is calculated according to y=693x+5, where y is the calculation result and x is the number of welding strips.

[0015] The beneficial effects of the present invention are: it can evaluate the influence of welding process parameters on the actual product in advance, guide the subsequent physical production, and effectively improve the efficiency of core production through laser welding in the subsequent physical production; compared with the existing high-saturation soft magnetic alloy core bonding technology, the core production efficiency is improved by about 300%. DETAILED DESCRIPTION

[0016] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0017] Example 1

[0018] The present invention provides a calculation method for the influence of high-saturation motor core connection and magnetic properties. Multiple layers of core punching sheets are stacked, and the magnetic property change rate is calculated based on a linear formula according to the preset number of welding strips and welding times during laser welding. According to the number of welding strips and welding times parameters corresponding to the expected magnetic property change rate, the multiple layers of core punching sheets are connected by laser welding according to the number of welding strips and welding times parameters; the number of welding strips is the number of welding strips on the outer circle of the core; the magnetic property change rate includes six items, namely, magnetic property B400 change rate, magnetic property B800 change rate, magnetic property B1600 change rate, magnetic property B2400 change rate, magnetic property B4000 change rate, and magnetic property B8000 change rate.

[0019] Preferably, the welding is performed once or twice.

[0020] Preferably, the core punching sheet is a 1J22 soft magnetic alloy core.

[0021] Generally, laser beam rapid melting is used for welding. For an iron core about 30 mm long, a single weld takes about 0.5 s, and conventional three welds take about 1.5 s. Compared with the curing time required for bonding, the efficiency is greatly improved.

[0022] Example 2

[0023] Based on Example 1, when the welding number is one, the change rate of the magnetic property B400 is calculated according to y=74.28x+2.556, and the change rate of the magnetic property B800 is calculated according to y=150.8x+1.067, where y is the calculation result and x is the number of welds.

[0024] Furthermore, when the welding number is one, the change rate of the magnetic property B1600 is calculated according to y=103.2x+3.226, and the change rate of the magnetic property B2400 is calculated according to y=144.8x+2.680, where y is the calculation result and x is the number of welds.

[0025] Furthermore, when the welding number is one, the change rate of the magnetic property B4000 is calculated according to y=6x+5.964, and the change rate of the magnetic property B8000 is calculated according to y=693x+4, where y is the calculation result and x is the number of welds.

[0026] Example 3

[0027] Based on Example 1, when the welding times are two, the change rate of the magnetic property B400 is calculated according to y=116x-0.745, and the change rate of the magnetic property B800 is calculated according to y=127.1x+0.967, where y is the calculation result and x is the number of welds.

[0028] Furthermore, when the welding times are two, the change rate of the magnetic property B1600 is calculated according to y=197.6x+1.629, and the change rate of the magnetic property B2400 is calculated according to y=330x+1.972, where y is the calculation result and x is the number of welds.

[0029] Furthermore, when the welding times are two, the change rate of the magnetic property B4000 is calculated as y=681x+1.968, and the change rate of the magnetic property B8000 is calculated as y=693x+5, where y is the calculation result and x is the number of welds.

[0030] Example 4

[0031] In combination with the above embodiment, 1J22 soft magnetic alloy material with a thickness of δ0.3 is used to punch out standard sample ring sheets with specifications of ф40×ф30×5, and the sheets are stacked and welded after heat treatment. The welding is carried out under argon protection. The welding effect is verified by using real objects, and the magnetic properties of the sample rings are tested before welding. The magnetic properties test data of the sample rings before and after welding are shown in Table 1 below.

[0032] Table 1 Magnetic property test record of sample ring after welding

[0033]

[0034]

[0035] Without affecting the required magnetic properties, the process parameters for improving the quality of welding welds are studied, and the verification details are shown in Table 2.

[0036] Table 2 Peak power welding process parameter test table

[0037]

[0038]

[0039] As can be seen from Table 2, when the laser welding process parameters are relatively small (such as when the power and pulse width are small), there are unfused defects and gaps in the weld, and the connection strength is low. When the laser welding process parameters are relatively large (such as when the power and pulse width are large), there are explosion points, pores, and pits in the weld. When the peak power of 600-650W, the pulse width of 2ms, and the frequency of 30Hz are selected, the weld appearance quality is relatively ideal, the forming is continuous and uniform, there are no pores and pits, and the welding quality is the best.

Claims

1. A method for calculating the influence of high saturation motor core connection and magnetic properties, characterized in that: The multi-layer core punching sheets are stacked, and the magnetic property change rate is calculated based on the linear formula according to the preset number of welding strips and welding times during laser welding. According to the number of welding strips and welding times corresponding to the expected magnetic property change rate, the multi-layer core punching sheets are connected by laser welding according to the number of welding strips and welding times parameters; the number of welding strips is the number of welding strips on the outer circle of the core; the magnetic property change rate includes six items, namely, the magnetic property B400 change rate, the magnetic property B800 change rate, the magnetic property B1600 change rate, the magnetic property B2400 change rate, the magnetic property B4000 change rate, and the magnetic property B8000 change rate.

2. The method for calculating the influence of the connection and magnetic properties of the high saturation motor core according to claim 1, characterized in that: The welding times are one or two.

3. The method for calculating the influence of the connection and magnetic properties of the high saturation motor core according to claim 1, characterized in that: When the welding number is one, the change rate of the magnetic property B400 is calculated according to y=74.28x+2.556, and the change rate of the magnetic property B800 is calculated according to y=150.8x+1.067, where y is the calculation result and x is the number of welding strips.

4. The method for calculating the influence of the connection and magnetic properties of the high saturation motor core according to claim 1, characterized in that: When the welding number is one, the change rate of the magnetic property B1600 is calculated according to y=103.2x+3.226, and the change rate of the magnetic property B2400 is calculated according to y=144.8x+2.680, where y is the calculation result and x is the number of welds.

5. The method for calculating the influence of the connection and magnetic properties of the high saturation motor core according to claim 1, characterized in that: When the welding number is one, the change rate of the magnetic property B4000 is calculated according to y=6x+5.964, and the change rate of the magnetic property B8000 is calculated according to y=693x+4, where y is the calculation result and x is the number of welding strips.

6. The method for calculating the influence of the connection and magnetic properties of the high saturation motor core according to claim 1, characterized in that: When the welding times are two, the change rate of the magnetic property B400 is calculated according to y=116x-0.745, and the change rate of the magnetic property B800 is calculated according to y=127.1x+0.967, where y is the calculation result and x is the number of welding strips.

7. The method for calculating the influence of the connection and magnetic properties of the high saturation motor core according to claim 1, characterized in that: When the welding times are two, the change rate of the magnetic property B1600 is calculated according to y=197.6x+1.629, and the change rate of the magnetic property B2400 is calculated according to y=330x+1.972, where y is the calculation result and x is the number of welding strips.

8. The method for calculating the influence of the connection and magnetic properties of the high saturation motor core according to claim 1, characterized in that: When the welding times are two, the change rate of the magnetic property B4000 is calculated according to y=681x+1.968, and the change rate of the magnetic property B8000 is calculated according to y=693x+5, where y is the calculation result and x is the number of welding strips.

9. The method for calculating the influence of the connection and magnetic properties of the high saturation motor core according to claim 1, characterized in that: The core punching sheet is a 1J22 soft magnetic alloy core.

Images