Processing method of brushless motor and intermediate for brushless motor

Abstract

The present invention discloses a method for machining a brushless motor and an intermediate for the motor. The method comprises: providing a spindle; securing two magnetic cores spaced apart on the spindle, wherein the combination of the spindle and the two magnetic cores is symmetrical about a radial cross-section of the spindle; assembling the middle portion of the spindle to a support position of a machining device; and driving the spindle to rotate and using the machining device to perform concentricity machining on the outer peripheral surfaces of the two rotating magnetic cores. The present invention helps to suppress the problem of low machining accuracy caused by the deadweight and centrifugal force of the combination, thereby improving the concentricity machining accuracy of the outer peripheral surfaces of the magnetic cores.

Description

Technical Field

[0001] The present invention relates to the technical field of brushless motors, and in particular to a method for processing a brushless motor and an intermediate for the brushless motor. Background Art

[0002] A brushless motor includes a motor shaft and a magnetic core that is sleeved and fixed to the motor shaft. To ensure the performance of the brushless motor, the outer circumference of the magnetic core must maintain the highest possible concentricity with the motor shaft. A common machining method involves first sleeve-fixing the magnetic core to the motor shaft, and then fine-machining the outer circumference of the magnetic core with the motor shaft as a reference to ensure a high degree of concentricity between the outer circumference of the magnetic core and the motor shaft. Specifically, there are currently two main machining methods:

[0003] 1. Attach each end of the motor shaft to the two supports of the processing equipment. The motor shaft can then be driven to rotate and the magnetic core on the motor shaft can be processed for concentricity using the processing equipment. However, this processing method has the problem of high equipment prices. Moreover, because both ends of the motor shaft need to be assembled in corresponding supports, repeated calibration is required to ensure balance, resulting in low efficiency and high costs.

[0004] 2. Only one end of the motor shaft is assembled in the support position of the processing equipment, and then the motor shaft can be driven to rotate and the magnetic core on the motor shaft can be processed for concentricity using the processing equipment. Although this processing method does not require repeated balance correction and can use relatively low-priced equipment compared to the processing method in which both ends are assembled in the support position, since this processing method only assembles one end of the motor shaft in the support position of the processing equipment, there is a problem of poor balance. When the motor shaft is driven to rotate, since only one end of the motor shaft is fixed in the support position, it is unable to overcome the problem of low processing accuracy caused by the deadweight and centrifugal force of the motor shaft and the magnetic core, and thus it is difficult to ensure a high concentricity processing accuracy, especially when the reference length of the motor shaft that can be fixed in the support position is limited. Summary of the Invention

[0005] The object of the present invention is to provide a method for processing a brushless motor, which is conducive to solving at least one technical problem existing in the above-mentioned background technology.

[0006] Another object of the present invention is to provide an intermediate for a brushless motor, which is helpful in solving at least one technical problem existing in the above-mentioned background technology.

[0007] In order to achieve the above object, the present invention discloses a method for processing a brushless motor, comprising:

[0008] Providing a main shaft;

[0009] Two magnetic cores are fixedly sleeved on the main shaft at intervals, and the combination of the main shaft and the two magnetic cores is symmetrical about the middle radial section of the main shaft;

[0010] Assembling the middle portion of the spindle to the support position of the processing equipment;

[0011] The main shaft is driven to rotate and the processing equipment is used to perform concentricity processing on the outer peripheral surfaces of the two rotating magnetic cores.

[0012] The brushless motor processing method of the present invention only requires the middle of the main shaft to be assembled in the support position of the processing equipment when the magnetic core is fixed on the main shaft to perform the concentricity processing of the outer peripheral surface. There is only one installation reference, and there is no need to perform reverse correction to ensure the balance, which is beneficial to improving processing efficiency and reducing processing costs. In addition, because the combination of the main shaft and the two magnetic cores is symmetrical about the middle radial cross-section of the main shaft, when the middle of the main shaft is assembled to the support position of the processing equipment, the parts of the combination located on both sides of the middle of the main shaft have better balance, and compared with the existing technology with only one installation reference, the present invention is beneficial to make the main shaft have a longer assembly reference surface. When the main shaft rotates in the support position, it is beneficial to suppress the problem of low processing accuracy caused by the deadweight and centrifugal force of the combination, and thus it is beneficial to improve the concentricity processing accuracy of the outer peripheral surface of the magnetic core.

[0013] Optionally, the processing equipment performs concentricity processing on the outer peripheral surfaces of the two magnetic cores by grinding.

[0014] Optionally, after the concentricity processing of the outer circumferential surfaces of the two magnetic cores is completed, the processing method further includes:

[0015] The main shaft is cut to separate into two motor components, each of which includes a motor shaft and the magnetic core.

[0016] In order to achieve the above object, the present invention discloses an intermediate for a brushless motor, characterized in that it comprises:

[0017] spindle;

[0018] Two magnetic cores, the two magnetic cores are sleeved and fixed on the main shaft at intervals;

[0019] The intermediate body is symmetrical about a median radial section of the main axis.

[0020] When the present invention is performing concentricity processing on the outer peripheral surface of the magnetic core, the intermediate body can be directly processed by assembling the middle part of the main shaft in the support position of the processing equipment. Since there is only one installation reference, there is no need to perform reverse correction to ensure balance, which is beneficial to improving processing efficiency and reducing processing costs. In addition, since the intermediate body is symmetrical about the middle radial cross-section of the main shaft, when the middle part of the main shaft is assembled to the support position of the processing equipment, the parts of the intermediate body located on both sides of the middle part of the main shaft have better balance, and compared with the existing technology with only one installation reference, the present invention is beneficial to make the main shaft have a longer assembly reference surface, and when the main shaft rotates in the support position, it is beneficial to suppress the problem of low processing accuracy caused by the dead weight and centrifugal force of the combination, and thus it is beneficial to improve the concentricity processing accuracy of the outer peripheral surface of the magnetic core. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a flow chart of a method for processing a brushless motor according to an embodiment of the present invention.

[0022] Figure 2 It is a structural schematic diagram of a combination of a main shaft and two magnetic cores according to an embodiment of the present invention.

[0023] Figure 3 It is a structural schematic diagram of two motor components formed by cutting a combination of a main shaft and two magnetic cores according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to explain the technical content, structural features, achieved objectives and effects of the present invention in detail, the following is a detailed description in conjunction with the embodiments and the accompanying drawings.

[0025] See also Figures 1 to 3 The embodiment of the present invention discloses a method for processing a brushless motor, comprising:

[0026] 101. Provide a main shaft 1.

[0027] Specifically, the length of the main shaft 1 can be selected to be equal to the sum of the lengths of two motor shafts 5 of the same specification, that is, equivalent to twice the length of a normal motor shaft 5. Of course, this is not limited to this, and the length of the main shaft 1 can also be greater than twice the length of a normal motor shaft 5 as needed.

[0028] 102. Two magnetic cores 2 are fixedly mounted on the main shaft 1 at intervals. The combination of the main shaft 1 and the two magnetic cores 2 is symmetrical about the middle radial section 11 of the main shaft 1. After the brushless motor is processed, the magnetic cores 2 are used as the inner rotor of the brushless motor.

[0029] Since two magnetic cores 2 are fixed on the main shaft 1 and the combination of the main shaft 1 and the two magnetic cores 2 is symmetrical about the middle radial section 11 of the main shaft 1, two independent motor components can be formed by cutting the main shaft 1 later.

[0030] Specifically, the magnetic core 2 sleeved on the main shaft 1 has been rough-machined, and after being sleeved on the main shaft 1, the outer surface of the magnetic core 2 is mainly fine-machined to ensure that the outer surface of the magnetic core 2 meets the concentricity requirement with the shaft. Of course, this is not limited to this.

[0031] 103. Assemble the middle part of the main shaft 1 to the support position of the processing equipment.

[0032] Since the combination of the main shaft 1 and the two magnetic cores 2 is symmetrical about the middle radial section 11 of the main shaft 1 (i.e., the radial section at the middle position of the main shaft 1), when the middle part of the main shaft 1 (the middle radial section 11 is located in the middle position of the middle part of the main shaft 1) is assembled to the support position of the processing equipment, the parts of the combination located on both sides of the middle part of the main shaft 1 have better balance, and compared with the prior art, the present invention is conducive to making the middle part of the main shaft 1 assembled to the support position have a longer length (with a longer assembly reference surface), and thus when the main shaft 1 rotates at the support position, it is conducive to suppressing the problem of inconsistent centrifugal force caused by the deadweight of the combination. In addition, the size of the area occupied by the "middle part of the main shaft 1" here can be set according to actual conditions. It can be understood that the "middle part of the main shaft 1" is located between the two magnetic cores 2 and is normally spaced apart from the two magnetic cores 2.

[0033] It should be noted that the present invention does not limit the execution order of operation 102 and operation 103, and cannot rule out the situation where the middle part of the main shaft 1 is first assembled to the support position of the processing equipment, and then the two magnetic cores 2 are sleeved and fixed on the main shaft 1.

[0034] Specifically, the support position is defined by three bearings, and the middle portion of the main shaft 1 is assembled between the three bearings. The main shaft 1 is driven to rotate by the middle portion of the main shaft 1 being assembled in the support position.

[0035] 104. Drive the main shaft 1 to rotate and use processing equipment to perform concentricity processing on the outer circumferences of the two rotating magnetic cores 2 so that the outer circumferences of the magnetic cores 2 meet the concentricity requirement with the main shaft 1.

[0036] Optionally, the processing equipment performs concentricity processing on the outer peripheral surfaces of the two magnetic cores 2 by grinding.

[0037] Specifically, the processing equipment may utilize a rotating grinding tool to process the outer peripheral surface of the magnetic core 2 .

[0038] As an optional embodiment, the outer circumferences of the two magnetic cores 2 can be processed for concentricity simultaneously. Furthermore, the outer circumferences of the two magnetic cores 2 can be processed synchronously and symmetrically, that is, the synchronously processed areas are substantially symmetrical areas.

[0039] Of course, the present invention is not limited to performing concentricity processing on the outer circumferences of the two magnetic cores 2 at the same time.

[0040] After the concentricity processing of the outer circumferences of the two magnetic cores 2 is completed, the processing method of the present invention further includes:

[0041] The main shaft 1 is cut to separate into two motor components, each of which includes a motor shaft 5 and a magnetic core 2.

[0042] It should be noted that cutting the main shaft 1 to separate it into two motor components is not limited to completing the concentricity processing of the outer surface of the magnetic core 2. It is not ruled out that other processing is performed before this, and even other components are assembled on the combination of the main shaft 1 and the two magnetic cores 2.

[0043] In the processing method of the brushless motor of the present invention, when the magnetic core 2 is fixed on the main shaft 1 to perform concentricity processing on the outer peripheral surface, it is only necessary to assemble the middle part of the main shaft 1 in the support position of the processing equipment. There is only one installation reference, and there is no need to perform reverse correction to ensure balance, which is conducive to improving processing efficiency, reducing processing costs and reducing equipment requirements. In addition, since the combination of the main shaft 1 and the two magnetic cores 2 is symmetrical about the middle radial section 11 of the main shaft 1, when the middle part of the main shaft 1 is assembled to the support position of the processing equipment, the parts of the combination located on both sides of the middle part of the main shaft 1 have better balance, and compared with the existing technology with only one installation reference, the present invention is conducive to making the main shaft 1 have a longer assembly reference surface. When the main shaft 1 rotates in the support position, it is conducive to suppressing the problem of low processing accuracy caused by the dead weight and centrifugal force of the combination, and thus it is conducive to improving the concentricity processing accuracy of the outer peripheral surface of the magnetic core 2.

[0044] See also Figure 2 and Figure 3 The present invention also discloses an intermediate body for a brushless motor, comprising a main shaft 1 and two magnetic cores 2. The two magnetic cores 2 are spaced apart and fixed on the main shaft 1. The intermediate body is symmetrical about a middle radial section 11 of the main shaft 1.

[0045] Since two magnetic cores 2 are fixed on the main shaft 1 and the intermediate body is symmetrical about the middle radial section 11 of the main shaft 1, two independent motor components can be formed by cutting the main shaft 1 later, each motor component including a motor shaft 5 and a magnetic core 2.

[0046] Specifically, after the brushless motor is processed, the magnetic core 2 is used as the inner rotor of the brushless motor.

[0047] Specifically, the length of the main shaft 1 can be selected to be equal to the sum of the lengths of two motor shafts 5 of the same specification, that is, equivalent to twice the length of a normal motor shaft 5. Of course, it is not limited thereto, and the length of the main shaft 1 can also be greater than twice the length of a normal motor shaft 5.

[0048] When the present invention is performing concentricity processing on the outer peripheral surface of the magnetic core 2, the intermediate body can be directly processed by assembling the middle part of the main shaft 1 on the support position of the processing equipment. Since there is only one installation reference, there is no need to perform reverse correction to ensure balance, which is beneficial to improving processing efficiency, reducing processing costs and reducing equipment requirements. In addition, since the intermediate body is symmetrical about the middle radial section 11 of the main shaft 1, when the middle part of the main shaft 1 is assembled to the support position of the processing equipment, the parts of the intermediate body located on both sides of the middle part of the main shaft 1 have better balance, and compared with the existing technology with only one installation reference, the present invention is beneficial to make the main shaft 1 have a longer assembly reference surface, and when the main shaft 1 rotates in the support position, it is beneficial to suppress the problem of low processing accuracy caused by the dead weight and centrifugal force of the combination, and thus it is beneficial to improve the concentricity processing accuracy of the outer peripheral surface of the magnetic core 2.

[0049] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope of the present invention.

Claims

1. A method for processing a brushless motor, characterized in that: include: Providing a main shaft; Two magnetic cores are fixedly sleeved on the main shaft at intervals, and the combination of the main shaft and the two magnetic cores is symmetrical about the middle radial section of the main shaft; Assembling the middle portion of the spindle to the support position of the processing equipment; driving the spindle to rotate and using the processing equipment to perform concentricity processing on the outer peripheral surfaces of the two rotating magnetic cores; After the concentricity processing of the outer circumferences of the two magnetic cores is completed, the processing method further includes: The main shaft is cut to separate into two motor components, each of which includes a motor shaft and the magnetic core.

2. The method for processing a brushless motor according to claim 1, wherein: The processing equipment performs concentricity processing on the outer peripheral surfaces of the two magnetic cores by grinding.

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