A multi-station integrated equipment and process for making motor cores

Abstract

The present invention discloses a multi-station integrated equipment and process for making motor cores, the integrated equipment comprises a rotary table and a gantry spanning above the rotary table, a loading and unloading station, a compaction detection station and a welding station are arranged on the rotary table; wherein the loading and unloading station is located on one side of the gantry on the rotary table, and the compaction detection station and the welding station are located on the other side of the gantry on the rotary table; each station is respectively provided with a numerical control indexing plate, an iron core positioning die is fixed on the numerical control indexing plate, a compaction detection assembly is arranged on the gantry corresponding to the upper position of the compaction detection station, and a compaction welding assembly is arranged on the gantry corresponding to the upper position of the welding station; an ejection mechanism is arranged on the lower end surface of the rotary table and located below each station. The present invention improves the quality and efficiency of making motor cores.

Description

Technical Field

[0001] The invention relates to the technical field of motor core manufacturing, and in particular to multi-station integrated equipment and a process for manufacturing motor cores. Background Art

[0002] The iron core of the motor stator and rotor is made of stacked silicon steel sheets (punching sheets). Silicon steel sheets are usually punched on a punch press using a progressive die. Conventional motor iron cores are made by stacking silicon steel sheets into one piece by riveting, but some iron cores are made by stacking silicon steel sheets and then welding them. The typical welding structure of bulk iron cores is to set a number of slots on the outer circle of the iron core, and the bulk iron core is welded into a whole by plug welding in the slots.

[0003] Since the iron core is a bulk structure before welding, the general manufacturing method is to use a positioning mandrel to achieve the stacking and positioning of the silicon steel sheets, and then put them on a semi-automatic welding machine for welding. However, since the adjacent silicon steel sheets are not in close contact after stacking, it is easy to cause the height of the stacked iron core to be too high and affect the magnetic properties of the iron core. In addition, the welding quality and welding efficiency after stacking are not high.

[0004] Therefore, improvements are made to the prior art to solve the above problems. Summary of the invention

[0005] In order to solve the above problems, the present invention proposes a multi-station integrated equipment and process for motor core production, aiming to improve the quality and efficiency of motor core production. The specific technical solution is as follows:

[0006] A multi-station integrated equipment for making motor cores, comprising a control system, a rotary table and a gantry spanning above the rotary table, wherein N workstations are evenly distributed on the rotary table along the same circumferential direction, and the N workstations include at least the following three workstations: a loading and unloading workstation, a compaction detection workstation and a welding workstation; wherein the loading and unloading workstation is located on one side of the gantry on the rotary table, and the compaction detection workstation and the welding workstation are located on the other side of the gantry on the rotary table; wherein each of the workstations is respectively provided with a CNC dividing plate, an iron core positioning mold is fixed on the CNC dividing plate, a compaction detection assembly is provided on the gantry at an upper position corresponding to the compaction detection workstation, and a compaction welding assembly is provided on the gantry at an upper position corresponding to the welding workstation; wherein an ejection mechanism is provided on the lower end surface of the rotary table and at a position below each of the workstations.

[0007] Preferably, the ejection mechanism includes a number of fixed rods erected downwardly on the lower end surface of the rotary worktable, a lower end fixed plate connected to the lower ends of the number of fixed rods, an ejection cylinder installed on the lower end fixed plate, a push plate connected to the ejection cylinder and located between the rotary worktable and the lower end fixed plate, a number of ejection rods erected on the upper end surface of the push plate, the rotary worktable is provided with ejection guide holes, and the number of ejection rods are movably arranged on the ejection guide holes on the rotary worktable; the CNC dividing plate and the iron core positioning mold are respectively provided with ejection avoidance holes for avoiding the ejection rods during ejection.

[0008] Preferably, the compaction detection assembly includes an upper fixed plate arranged on the crossbeam of the gantry and extending above the compaction detection workstation, a number of guide rods slidably arranged on the upper fixed plate, a lifting plate connected to the lower ends of the guide rods, and a rotating pressure head arranged at the lower end of the lifting plate, a servo pressing cylinder is arranged on the upper fixed plate, a pressing rod of the servo pressing cylinder is connected to the lifting plate, and a photoelectric ranging sensor for detecting the upper and lower positions of the lifting plate is also arranged on the upper fixed plate.

[0009] Preferably, the compaction welding assembly includes an upper fixed plate arranged on the cross beam of the gantry and extending above the welding workstation, a number of guide rods slidably arranged on the upper fixed plate, a lifting plate connected to the lower ends of the guide rods, and a rotating pressure head arranged at the lower end of the lifting plate. A servo pressing cylinder is arranged on the upper fixed plate, and the pressing rod of the servo pressing cylinder is connected to the lifting plate. A welding robot is also arranged next to the rotary workbench and close to the welding workstation.

[0010] In the present invention, a pressure sensor is provided between the pressing rod of the servo pressing cylinder and the lifting plate.

[0011] As a further improvement of the present invention, a sleeve is vertically arranged downward on the lifting plate of the compaction detection assembly, and a magnetic induction gap heater is arranged on the inner wall of the sleeve. When the rotating pressure head of the compaction detection assembly presses the motor core, the sleeve is sheathed around the outer periphery of the motor core; a contact temperature sensor for detecting the temperature of the motor core is arranged on the rotating pressure head of the compaction detection assembly.

[0012] As a further improvement of the present invention, an insulation ring is vertically arranged downward on the lifting plate of the compaction welding assembly, and an infrared heater is arranged on the inner wall of the insulation ring. When the rotating pressure head of the compaction welding assembly presses the motor core, the insulation ring is sleeved on the outer periphery of the motor core, and an opening is axially arranged on the side of the insulation ring close to the welding robot to form a welding avoidance space when the welding robot performs welding; a contact temperature sensor for detecting the temperature of the motor core is arranged on the rotating pressure head of the compaction welding assembly.

[0013] In the present invention, the rotary worktable is a numerically controlled rotary worktable driven by a servo motor and a reduction mechanism.

[0014] A motor core manufacturing process of a multi-station integrated device for manufacturing a motor core, comprising the following steps:

[0015] (1) Workpiece loading: Install the motor core onto the core positioning mold at the loading and unloading work station of the rotary table;

[0016] (2) Compacting test: The rotary table rotates an angle to transfer the motor core to the compacting test station. The rotating pressure head of the compacting test assembly presses the motor core with a set pressure to complete the compacting operation of the motor core. The height of the core in the compacted state is calculated based on the displacement of the servo pressure cylinder. If the height test of the motor core fails, the ejection mechanism will eject the motor core, and the defective product removal robot arranged next to the compacting test station will take the motor core away. If the height test of the motor core passes, proceed to the next step.

[0017] (3) Compact welding: The rotary table rotates an angle to transfer the motor core to the welding workstation. The rotary pressure head of the compaction welding assembly presses the motor core with a set pressure, and drives the welding robot to weld the motor core. After each weld, the CNC indexing plate rotates an angle to weld the next weld until all welds are completed. After welding, the rotary table moves the core to the unloading station, and the ejection mechanism ejects the core. The finished product picking robot arranged next to the welding workstation takes the motor core away.

[0018] As a further improvement to the above-mentioned motor core manufacturing process, during the compaction detection in step (2), the magnetic induction gap heater is also turned on to perform gap preheating on the motor core, and the temperature of the motor core is detected by a contact temperature sensor; the gap preheating refers to the alternating heating of the magnetic induction gap heater by powering on and stopping the heating by powering off, so that the motor core reaches the set temperature and effectively prevents the motor core from overheating; during the compaction welding in step (3), the infrared heater is also turned on to keep the motor core warm.

[0019] Preferably, in the compaction test of step (2), the criterion for determining whether the motor core height is qualified is corrected according to the preheating temperature of the motor core. The specific correction method is: a gap preheating test of the motor core is performed in advance on the compaction test work station of the equipment, and the height H1 of the preheated motor core and the height H2 of the motor core after cooling to room temperature after preheating are respectively detected under the set equal pressure, so as to obtain a reduction value Δ=H1-H2 of the motor core height when the motor core is preheated and then cooled to room temperature, and the reduction value Δ of the motor core height is used as a compensation value to correct the original standard value of the motor core height.

[0020] The beneficial effects of the present invention are:

[0021] First, the present invention is a multi-station integrated equipment and process for the production of motor cores, which integrates feeding, compaction detection and welding. The motor core is height-detected after compaction and welded after compaction, thereby reducing or avoiding the super-height phenomenon of the motor core and improving the quality of motor core production.

[0022] Secondly, the present invention is a multi-station integrated equipment and process for the production of motor cores. The three stations of loading, compaction detection and welding can operate simultaneously, thereby greatly improving the efficiency of motor core production.

[0023] Third, the present invention is a multi-station integrated equipment and process for the production of motor cores. A magnetic induction gap heater is provided on the compaction detection component. The motor core is gap preheated at the compaction detection station. On the one hand, the motor core is easier to be compacted after the core is preheated. On the other hand, the preheated core can also improve the subsequent welding environment of the motor core at the welding work station, thereby improving the welding quality.

[0024] Fourthly, in the multi-station integrated equipment and process for producing motor cores of the present invention, a heat preservation ring with an opening is provided on the compacted welding assembly, which further ensures the quality of welding.

[0025] Fifth, the present invention is a multi-station integrated equipment and process for producing motor cores. The preheating of the motor cores is intermittent preheating, which can avoid overheating of the motor cores.

[0026] Sixth, the present invention is a multi-station integrated equipment and process for the production of motor cores. The motor core height detection is compensated according to the preheating temperature, thereby improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall layout (top view) of a multi-station integrated equipment for making motor cores of the present invention;

[0028] Figure 2 yes Figure 1 A schematic diagram of the structure of the compaction detection component and the ejection mechanism on the compaction detection work station;

[0029] Figure 3 yes Figure 1 The schematic diagram of the structure of the compaction welding assembly and the ejection mechanism part at the welding work station is involved.

[0030] In the figure: 1. Rotating worktable, 2. Gantry, 3. Loading and unloading workstation, 4. Compacting detection workstation, 5. Welding workstation, 6. CNC indexing plate, 7. Core positioning mold, 8. Compacting detection assembly, 9. Compacting welding assembly, 10. Ejection mechanism, 11. Fixed rod, 12. Lower fixed plate, 13. Ejection cylinder, 14. Pushing plate, 15. Ejection rod, 16. Ejection guide hole, 17. Ejection avoidance hole, 18. , upper fixed plate, 19, guide rod, 20, lifting plate, 21, rotating pressure head, 22, servo pressure cylinder, 23, photoelectric ranging sensor, 24, welding manipulator, 25, pressure sensor, 26, sleeve, 27, magnetic induction gap heater, 28, motor core, 29, contact temperature sensor, 30, insulation ring, 31, infrared heater, 32, opening, 33, radial rolling bearing, 34, plane thrust bearing. DETAILED DESCRIPTION

[0031] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0032] Embodiment 1:

[0033] like Figures 1 to 3The figure shows an embodiment of a multi-station integrated equipment and process for making a motor core of the present invention, comprising a control system, a rotary table 1 and a gantry 2 spanning above the rotary table 1, wherein N workstations are evenly distributed along the same circumferential direction on the rotary table 1, and the N workstations include at least the following three workstations: a loading and unloading workstation 3, a compaction detection workstation 4 and a welding workstation 5; wherein the loading and unloading workstation 3 is located on one side of the gantry 2 on the rotary table 1, and the compaction detection workstation 4 is located on the one side of the gantry 2 on the rotary table 1. The workstation 4 and the welding workstation 5 are located on the other side of the gantry 2 on the rotating worktable 1; wherein, each of the workstations is respectively provided with a CNC dividing plate 6, on which a core positioning mold 7 is fixed; a compaction detection assembly 8 is provided on the gantry 2 at an upper position corresponding to the compaction detection workstation 4, and a compaction welding assembly 9 is provided on the gantry 2 at an upper position corresponding to the welding workstation 5; wherein, an ejection mechanism 10 is provided on the lower end surface of the rotating worktable 1 and at a position below each of the workstations.

[0034] Preferably, the ejection mechanism 10 includes a number of fixed rods 11 erected downwardly on the lower end surface of the rotary worktable 1, a lower end fixed plate 12 connected to the lower ends of the number of fixed rods 11, an ejection cylinder 13 installed on the lower end fixed plate 12, a push plate 14 connected to the ejection cylinder 13 and located between the rotary worktable 1 and the lower end fixed plate 12, and a number of ejection rods 15 erected on the upper end surface of the push plate 14; the rotary worktable 1 is provided with ejection guide holes 16, and the number of ejection rods 15 are movably arranged on the ejection guide holes 16 on the rotary worktable 1; the CNC dividing plate 6 and the core positioning mold 7 are respectively provided with ejection avoidance holes 17 for avoiding the ejection rods 15 during ejection.

[0035] Preferably, the compaction detection assembly 8 includes an upper fixed plate 18 arranged on the crossbeam of the gantry 2 and extending above the compaction detection workstation 4, a number of guide rods 19 slidably arranged on the upper fixed plate 18, a lifting plate 20 connected to the lower end of the guide rod 19, and a rotating pressure head 21 arranged at the lower end of the lifting plate 20. A servo pressing cylinder 22 is arranged on the upper fixed plate 18, and the pressing rod of the servo pressing cylinder 22 is connected to the lifting plate 20. A photoelectric ranging sensor 23 for detecting the upper and lower positions of the lifting plate 20 is also arranged on the upper fixed plate 18.

[0036] Preferably, the compaction welding assembly 9 includes an upper fixed plate 18 arranged on the cross beam of the gantry 2 and extending above the welding workstation 5, a number of guide rods 19 slidably arranged on the upper fixed plate 18, a lifting plate 20 connected to the lower end of the guide rod 19, and a rotating pressure head 21 arranged at the lower end of the lifting plate 20. A servo pressing cylinder 22 is arranged on the upper fixed plate 18, and the pressing rod of the servo pressing cylinder 22 is connected to the lifting plate 20. A welding robot 24 is also arranged next to the rotary worktable 1 and close to the welding workstation 5.

[0037] In this embodiment, a pressure sensor 25 is provided between the pressing rod of the servo pressing cylinder 22 and the lifting plate 20 .

[0038] As a further improvement of the present embodiment, a sleeve 26 is vertically arranged downward on the lifting plate 20 of the compaction detection assembly 8, and a magnetic induction gap heater 27 is arranged on the inner wall of the sleeve 26. When the rotating pressure head 21 of the compaction detection assembly 8 presses the motor core 28, the sleeve 26 is sleeved on the periphery of the motor core 28; a contact temperature sensor 29 for detecting the temperature of the motor core 28 is arranged on the rotating pressure head of the compaction detection assembly 8.

[0039] As a further improvement of the present embodiment, an insulation ring 30 is vertically arranged downward on the lifting plate of the compaction welding assembly 9, and an infrared heater 31 is arranged on the inner wall of the insulation ring 30. When the rotating pressure head 21 of the compaction welding assembly 9 presses the motor core 28, the insulation ring 30 is sleeved on the outer periphery of the motor core 28. An opening 32 is axially arranged on the side of the insulation ring 30 close to the welding robot 24 to form a welding avoidance space when the welding robot 24 is welding; a contact temperature sensor 29 for detecting the temperature of the motor core 28 is arranged on the rotating pressure head 21 of the compaction welding assembly 9.

[0040] In this embodiment, the rotary table 1 is a numerically controlled rotary table driven by a servo motor and a reduction mechanism.

[0041] Embodiment 2:

[0042] A process for manufacturing a motor core using the multi-station integrated equipment for manufacturing a motor core according to Embodiment 1 comprises the following steps:

[0043] (1) Workpiece loading: At the loading and unloading work station 3 of the rotary table 1, the motor core 28 is mounted on the core positioning mold 7;

[0044] (2) Compaction detection: The rotary table 1 rotates an angle to transfer the motor core 28 to the compaction detection workstation 4. The rotary pressure head 21 of the compaction detection assembly 8 presses the motor core 28 with a set pressure, and the numerical control dividing plate 6 is turned on and rotated several times to complete the rotation and compaction operation of the motor core 28. Then, the photoelectric distance sensor 23 detects the height of the motor core 28 after compaction. If the height detection of the motor core 28 fails, the ejection mechanism 10 ejects the motor core 28, and the defective product picking robot arranged next to the compaction detection workstation 4 takes away the motor core 28. If the height detection of the motor core 28 passes, the next step is entered.

[0045] (3) Compacting welding: The rotating worktable 1 rotates an angle to transfer the motor core 28 to the welding workstation 5. The rotating pressure head 21 of the compacting welding assembly 9 presses the motor core 28 with a set pressure, and drives the welding robot 24 to weld the motor core 28. After each weld is completed, the CNC indexing plate 6 rotates an angle to weld the next weld until all welds are completed. The ejection mechanism 10 ejects the motor core 28, and the finished product taking robot arranged next to the welding workstation 5 takes the motor core 28 away.

[0046] As a further improvement to the above-mentioned motor core manufacturing process, during the compaction detection of step (2), the magnetic induction gap heater 27 is also turned on to perform intermittent preheating on the motor core 28, and the temperature of the motor core 28 is detected by the contact temperature sensor 29; the intermittent preheating refers to the alternating heating of the magnetic induction gap heater 27 by powering on and stopping the heating by powering off, so that the motor core 28 reaches the set temperature and effectively prevents the motor core 28 from overheating; during the compaction welding of step (3), the infrared heater 31 is also turned on to keep the motor core 28 warm.

[0047] Preferably, in the compaction test of step (2), the criterion for determining whether the height of the motor core 28 is qualified is corrected according to the preheating temperature of the motor core 28. The specific correction method is: a gap preheating test of the motor core 28 is performed in advance on the compaction detection work station 4 of the equipment, and the height H1 of the preheated motor core 28 and the height H2 of the motor core 28 after preheating and after cooling to room temperature are respectively detected under the set equal pressure, so as to obtain a reduction value Δ=H1-H2 of the height of the motor core 28 when the motor core 28 is preheated and then cooled to room temperature, and the reduction value Δ of the motor core height is used as a compensation value to correct the original standard value of the motor core height.

[0048] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A multi-station integrated equipment for making motor cores, characterized in that: The invention comprises a control system, a rotating worktable and a gantry spanning above the rotating worktable, wherein N workstations are evenly distributed on the rotating worktable along the same circumferential direction, and the N workstations include at least the following three workstations: a loading and unloading workstation, a compaction detection workstation and a welding workstation; wherein the loading and unloading workstation is located on one side of the gantry on the rotating worktable, and the compaction detection workstation and the welding workstation are located on the other side of the gantry on the rotating worktable; wherein each of the workstations The work stations are respectively provided with CNC dividing plates, on which a core positioning die is fixed, a compaction detection assembly is provided on the gantry at an upper position corresponding to the compaction detection work station, and a compaction welding assembly is provided on the gantry at an upper position corresponding to the welding work station; wherein an ejection mechanism is provided on the lower end surface of the rotary table and below each of the work stations; during welding, the motor core is surrounded by a thermal insulation ring, and the three work stations for loading and unloading, compaction detection and welding operate simultaneously.

2. The multi-station integrated equipment for making motor cores according to claim 1, characterized in that: The ejection mechanism includes a number of fixed rods erected downwardly on the lower end surface of the rotating worktable, a lower end fixed plate connected to the lower ends of the number of fixed rods, an ejection cylinder installed on the lower end fixed plate, a push plate connected to the ejection cylinder and located between the rotating worktable and the lower end fixed plate, and a number of ejection rods erected on the upper end surface of the push plate. The rotating worktable is provided with ejection guide holes, and the number of ejection rods are movably arranged on the ejection guide holes on the rotating worktable; the CNC dividing plate and the iron core positioning mold are respectively provided with ejection avoidance holes for avoiding the ejection rods during ejection.

3. The multi-station integrated equipment for making motor cores according to claim 1, characterized in that: The compaction detection assembly includes an upper fixed plate arranged on the crossbeam of the gantry and extending above the compaction detection workstation, a number of guide rods slidably arranged on the upper fixed plate, a lifting plate connected to the lower ends of the guide rods, and a rotating pressure head arranged at the lower end of the lifting plate. A servo pressing cylinder is arranged on the upper fixed plate, and the pressing rod of the servo pressing cylinder is connected to the lifting plate. A photoelectric ranging sensor for detecting the upper and lower positions of the lifting plate is also arranged on the upper fixed plate.

4. The multi-station integrated equipment for producing motor cores according to claim 3, characterized in that: The compaction welding assembly includes an upper fixed plate arranged on the crossbeam of the gantry and extending above the welding workstation, a number of guide rods slidably arranged on the upper fixed plate, a lifting plate connected to the lower ends of the guide rods, and a rotating pressure head arranged at the lower end of the lifting plate. A servo pressing cylinder is arranged on the upper fixed plate, and the pressing rod of the servo pressing cylinder is connected to the lifting plate. A welding robot is also arranged next to the rotating worktable and close to the welding workstation.

5. The multi-station integrated equipment for producing motor cores according to claim 4, characterized in that: A pressure sensor is arranged between the pressing rod of the servo pressing cylinder and the lifting plate.

6. The multi-station integrated equipment for producing motor cores according to claim 5, characterized in that: A sleeve is also vertically arranged downward on the lifting plate of the compaction detection assembly, and a magnetic induction gap heater is arranged on the inner wall of the sleeve. When the rotating pressure head of the compaction detection assembly presses the motor core, the sleeve is sheathed on the periphery of the motor core; a contact temperature sensor for detecting the temperature of the motor core is arranged on the rotating pressure head of the compaction detection assembly.

7. The multi-station integrated equipment for producing motor cores according to claim 6, characterized in that: An insulation ring is also vertically arranged downward on the lifting plate of the compaction welding assembly, and an infrared heater is arranged on the inner wall of the insulation ring. When the rotating pressure head of the compaction welding assembly presses the motor core, the insulation ring is sleeved on the outer periphery of the motor core. An opening is axially arranged on the side of the insulation ring close to the welding robot to form a welding avoidance space when the welding robot is welding; a contact temperature sensor for detecting the temperature of the motor core is arranged on the rotating pressure head of the compaction welding assembly.

8. A process for manufacturing a motor core using the multi-station integrated equipment for manufacturing a motor core according to any one of claims 1 to 7, characterized in that: The steps include: (1) Workpiece loading: Install the motor core onto the core positioning mold at the loading and unloading work station of the rotary table; (2) Compacting test: The rotary table rotates at an angle to transfer the motor core to the compacting test work station. The rotating pressure head of the compacting test assembly presses the motor core with a set pressure to complete the compacting operation of the motor core. The height of the core in the compacted state is calculated based on the displacement of the servo pressure cylinder. If the motor core height test fails, the motor core will be ejected by the ejection mechanism, and the motor core will be taken away by the defective product taking manipulator arranged next to the compaction detection work station. If the motor core height test passes, the next step will be entered; (3) Compact welding: The rotary table rotates an angle to transfer the motor core to the welding workstation. The rotary pressure head of the compaction welding assembly presses the motor core with a set pressure, and drives the welding robot to weld the motor core. After each weld, the CNC indexing plate rotates an angle to weld the next weld until all welds are completed. After welding, the rotary table moves the core to the unloading station, and the ejection mechanism ejects the core. The finished product picking robot arranged next to the welding workstation takes the motor core away.

9. The motor core manufacturing process of the multi-station integrated equipment for motor core manufacturing according to claim 8, characterized in that: During the compaction detection of step (2), the magnetic induction gap heater is also turned on to perform gap preheating on the motor core, and the temperature of the motor core is detected by a contact temperature sensor; the gap preheating refers to the alternating heating of the magnetic induction gap heater by powering on and stopping the heating by powering off, so that the motor core reaches the set temperature and effectively prevents the motor core from overheating; during the compaction welding of step (3), the infrared heater is also turned on to keep the motor core warm.

10. The motor core manufacturing process of the multi-station integrated equipment for motor core manufacturing according to claim 9, characterized in that: In the compaction test of step (2), the criterion for determining whether the motor core height is qualified is corrected according to the preheating temperature of the motor core. The specific correction method is as follows: a gap preheating test of the motor core is performed in advance at the compaction test work station of the equipment, and the height H1 of the motor core after preheating and the height H2 of the motor core after preheating and cooling to room temperature are respectively detected under the set equal pressure, so as to obtain a reduction value Δ=H1-H2 of the motor core height when the motor core is preheated and then cooled to room temperature, and the reduction value Δ of the motor core height is used as a compensation value to correct the original standard value of the motor core height.

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