Method for improving slot fullness rate of motor

Abstract

The invention discloses a method for improving the slot fullness rate of a motor, and the method comprises the steps: removing patent leather in a motor slot position of a stator copper wire according to a preset patent leather removal strategy; and replacing the space occupied by the enameled leather removed part in the motor slot position of the stator copper wire with copper. According to the method for improving the slot fullness rate of the motor, the patent leather of the stator copper wire is firstly removed, and then the space of the removed patent leather part is replaced with copper, so that the copper content is improved, the slot fullness rate of the motor is improved, and the performance of the motor is improved; the slot space of the motor stator is better utilized, and the material utilization rate is improved; product optimization is promoted, and motor development is promoted; and a new thought is provided for future motor development.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and more specifically, to a method for improving a motor slot fill rate. Background Art

[0002] The motor slot fill rate refers to the ratio of the copper cross-sectional area in the motor slot to the slot cross-sectional area (i.e. the motor slot fill rate). For the motor, the slot is the basis for installing the coil, and the size of the motor coil slot fill rate is closely related to the motor efficiency. Increasing the motor slot fill rate can effectively reduce magnetic leakage, reduce copper wire resistance, and prevent magnetic circuit collapse, thereby improving the efficiency and power factor of the motor and reducing energy consumption. At the same time, a high slot fill rate can also improve the degree of fit between the stator and the rotor, increasing the output torque and power density of the motor.

[0003] At present, the slot fill rate of the motor is mainly improved by changing the coil structure or winding method and removing the paint on the lead-out part of the coil with a chemical solution. Among them, the method of changing the coil structure or winding method may complicate the manufacturing process and the improvement is limited; removing the paint on the lead-out part of the coil with a chemical solution has certain operational risks, and only removing the paint on the lead-out part is not of great significance to the slot fill rate of the entire motor.

[0004] Therefore, a method for improving the motor slot fill rate is urgently needed. Summary of the invention

[0005] The purpose of the present invention is to provide a method for improving the motor slot fill rate to solve the problems in the above-mentioned prior art, which can improve the motor slot fill rate and further improve the performance of the motor; to a certain extent, it can solve the shortcomings of low utilization rate and high loss of the motor stator slot space.

[0006] The present invention provides a method for improving the slot fill rate of a motor, which comprises:

[0007] According to the preset paint removal strategy, the paint in the motor slot of the stator copper wire is removed;

[0008] Replace the space occupied by the removed paint part of the stator copper wire in the motor slot with copper.

[0009] In the method for improving the slot fill rate of a motor as described above, preferably, the paint removal method in the motor slot of the stator copper wire is a laser removal method.

[0010] In the method for improving the slot fill rate of a motor as described above, preferably, the preset paint removal strategy includes a strategy of alternating all removal on both lateral sides, a strategy of simultaneous partial removal on both lateral sides, or a strategy of simultaneous all removal on one axial side.

[0011] In the method for improving the motor slot fill rate as described above, preferably, the strategy of removing all the paint on both sides alternately in the lateral direction includes: for multiple coils in the same motor slot, the paint on the upper and lower sides of adjacent coils are removed alternately.

[0012] The method for improving the motor slot fill rate as described above, wherein preferably, the strategy of simultaneous partial removal on both lateral sides includes: for multiple coils in the same motor slot, all coils are partially and symmetrically removed from the upper and lower sides of the paint; for the coils at both axial ends, the paint at one end close to the axial outer edge is also removed.

[0013] The method for improving the motor slot fill rate as described above, wherein preferably, the strategy of removing all the paint on one side in the axial direction at the same time includes: for multiple coils in the same motor slot, all coils have their paint on the same axial side removed, while retaining the paint on both sides of the coil.

[0014] The method for improving the motor slot full rate as described above, wherein preferably, the method for improving the motor slot full rate also includes:

[0015] For the lead-out portion of the coil, the lead-out portion is painted by varnish dipping, or the paint coating of the lead-out portion is retained during the process of removing the paint coating of the copper wire.

[0016] The present invention provides a method for improving the slot fill rate of a motor, first removing the paint coating of the stator copper wire, and then replacing the space of the removed paint coating portion with copper, thereby increasing the copper content, thereby increasing the slot fill rate of the motor and improving the performance of the motor; better utilizing the slot space of the motor stator and improving material utilization; promoting product optimization and promoting motor development; and providing new ideas for the future development of motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described below with reference to the accompanying drawings, in which:

[0018] Figure 1 A flow chart of an embodiment of a method for improving motor slot fill rate provided by the present invention;

[0019] Figure 2 It is a schematic diagram of the three-dimensional structure of the stator of the flat wire motor;

[0020] Figure 3 It is a schematic diagram of the cross-sectional structure of the stator of the flat wire motor;

[0021] Figure 4 for Figure 3 A schematic diagram of the enlarged structure at A in the middle;

[0022] Figure 5 for Figure 3Schematic diagram of dimension marking at A in the middle;

[0023] Figure 6 It is a schematic diagram of the strategy of removing all the parts alternately on both sides;

[0024] Figure 7 Schematic diagram of the strategy for simultaneous partial removal on both sides;

[0025] Figure 8 Schematic diagram of the axial single-sided simultaneous complete removal strategy. DETAILED DESCRIPTION

[0026] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present disclosure thorough and complete and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the components and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limiting.

[0027] The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprises" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] In the present disclosure, when a specific component is described as being located between a first component and a second component, there may or may not be an intermediate component between the specific component and the first component or the second component. When a specific component is described as being connected to other components, the specific component may be directly connected to the other components without an intermediate component, or may not be directly connected to the other components but have an intermediate component.

[0029] All terms (including technical terms or scientific terms) used in the present disclosure have the same meanings as those understood by ordinary technicians in the field to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0030] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0031] like Figure 1 As shown, the method for improving the motor slot fill rate provided in this embodiment includes the following steps in actual implementation:

[0032] Step S1: according to a preset paint removal strategy, remove the paint in the motor slot of the stator copper wire.

[0033] Among them, the paint removal method in the motor slot of the stator copper wire is laser removal.

[0034] Step S2: Replace the space occupied by the paint-removed portion of the stator copper wire in the motor slot with copper.

[0035] Take the flat wire motor as an example: the stator has 48 slots. Figure 2-Figure 5 As shown, each slot has 6 coils, the size of a single coil is 3mm*3mm, the paint thickness is 0.05mm, the insulation paper thickness is 0.1mm, the gap between the insulation paper and the coil is 0.2mm, and the slot area is 75.665mm 2 , the slot fill rate is 71.367%.

[0036] In one embodiment of the present invention, the preset paint removal strategy includes a strategy of alternating all removal on both lateral sides, a strategy of simultaneous partial removal on both lateral sides, or a strategy of simultaneous all removal on one axial side.

[0037] Specifically, the strategy of removing all the paint on both sides alternately includes: for multiple coils in the same motor slot, the paint on the upper and lower sides of adjacent coils are removed alternately. Figure 6 As shown in the figure, for the six coils numbered 1 to 6, the upper paint skin is removed from coil 1, the lower paint skin is removed from coil 2, and the thickness of the original paint skin is increased at the relative position of the copper wire (the increase ratio can be 5%-10%, for example, 8%), and so on. This method of removing the paint skin not only removes the paint skin of the coil and increases the copper wire content, thereby improving the slot fill rate of the motor, but also retains the necessary paint skin to ensure the insulation between the two coils.

[0038] K (slot full rate) = S (copper area) * n (number of coils) / A (slot cross-sectional area)

[0039] After removing the paint from the above locations:

[0040] K=S*n+3*0.05*n (side area)+0.05*3*2 (axial area) / A=72.953%.

[0041] Furthermore, the strategy of removing part of the paint on both sides at the same time includes: for multiple coils in the same motor slot, all coils are partially symmetrically removed from the upper and lower sides; for the coils at both ends of the axial direction, the paint on one end close to the outer edge of the axial direction is also removed. Figure 7 As shown, for the six coils numbered 9 to 14, part of the paint on the upper and lower sides is removed to ensure that the removed parts are the same. For example, the paint on the lower half of the coil is removed (such as Figure 7 ), retain the remaining paint to achieve the purpose of insulation.

[0042] K (slot full rate) = S (copper area) * n (number of coils) / A (slot cross-sectional area)

[0043] After removing the paint from the above locations:

[0044] K=S*n+1.5*2*0.05*n (side area)+0.05*3*2 (axial area) / A=72.953%.

[0045] In addition, for the coils at both ends of the axial direction (such as Figure 7 As shown, the coil numbers are 15 and 16), and the paint on the two top ends is also removed (the coil numbered 15 also removes the paint on the axial top end, and the coil numbered 16 also removes the paint on the axial bottom end), so that the insulation between the two coils can be ensured.

[0046] Furthermore, the strategy of removing all the paint on one side in the axial direction at the same time includes: for multiple coils in the same motor slot, the paint on the same axial side of all coils is removed, while the paint on both sides of the coil is retained. Figure 8 As shown, for the six coils numbered 17 to 22, the paint is completely removed from the same side of the axial portion (such as the top), while the paint on the sides of the coils (the upper side and the lower side) is retained.

[0047] K (slot full rate) = S (copper area) * n (number of coils) / A (slot cross-sectional area)

[0048] After removing the paint from the above locations:

[0049] K=S*n+3*0.05*n(axial area) / A=72.556%.

[0050] based on Figure 6-Figure 8 The calculation results of the slot fill rate obtained by the corresponding paint removal method show that after removing the paint, the slot fill rate of the motor is increased by about 1%-2%, the copper loss is reduced by about 2.5%, and the efficiency is increased by 0.05-0.15% under normal working conditions.

[0051] Furthermore, in some embodiments of the present invention, the method for improving the motor slot fill rate also includes:

[0052] Step S3: For the lead-out portion of the coil, paint the lead-out portion by varnish dipping, or retain the paint coating of the lead-out portion during the process of removing the paint coating of the copper wire.

[0053] For the lead-out part of the coil, removing the paint may cause a short circuit, so the lead-out part should be painted by varnish dipping, or in the process of removing the paint of the copper wire, only the relevant position should be removed instead of the lead-out part.

[0054] The method for improving the slot fill rate of a motor provided by an embodiment of the present invention first removes the paint coating of the stator copper wire, and then replaces the space of the removed paint coating portion with copper, thereby increasing the copper content, thereby increasing the slot fill rate of the motor and improving the performance of the motor; better utilizing the slot space of the motor stator and improving material utilization; promoting product optimization and promoting motor development; and providing new ideas for the future development of motors.

[0055] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0056] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A method for improving the slot fill rate of a motor, characterized in that: include: According to the preset paint removal strategy, the paint in the motor slot of the stator copper wire is removed; Replace the space occupied by the removed paint part of the stator copper wire in the motor slot with copper.

2. The method for improving the motor slot fill rate according to claim 1, characterized in that: The paint removal method in the motor slot of the stator copper wire is laser removal.

3. The method for improving motor slot fill rate according to claim 1, characterized in that: The preset paint removal strategy includes a strategy of removing all the paint alternately on both sides in the lateral direction, a strategy of removing part of the paint simultaneously on both sides in the lateral direction, or a strategy of removing all the paint simultaneously on one side in the axial direction.

4. The method for improving the motor slot fill rate according to claim 3, characterized in that: The strategy of removing all the paint on both sides alternately includes: for multiple coils in the same motor slot, the paint on the upper and lower sides of adjacent coils is removed alternately.

5. The method for improving motor slot fill rate according to claim 3, characterized in that: The strategy of removing part of the paint on both sides at the same time includes: for multiple coils in the same motor slot, all coils are partially symmetrically removed from the paint on the upper and lower sides; for the coils at both axial ends, the paint on one end close to the axial outer edge is also removed.

6. The method for improving motor slot fill rate according to claim 3, characterized in that: The strategy of removing all the paint on one side in the axial direction at the same time includes: for multiple coils in the same motor slot, the paint on the same axial side of all coils is removed, while the paint on both sides of the coil is retained.

7. The method for improving motor slot fill rate according to claim 1, characterized in that: The method for improving the motor slot full rate also includes: For the lead-out portion of the coil, the lead-out portion is painted by varnish dipping, or the paint coating of the lead-out portion is retained during the process of removing the paint coating of the copper wire.

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