Motor with brake, manufacturing method of motor with brake, and manufacturing method of motor series

Abstract

To provide a motor with brake requiring no adjustment of a position of a screw hole of a fastening bolt at the time of assembling, improving assembly efficiency, reducing assembly time, and realizing a cost reduction.SOLUTION: A motor with brake 100 has a motor part 10 having a stator 13 and a rotor 12, a brake disc 35 applying brake force to a shaft 11 extending from the rotor 12, and a cylindrical brake stator 31 functioning as an electric magnet and applying electromagnetic force to the brake disc 35, and a brake 30 disposed on an anti-load side of the shaft 11 with respect to the motor part 10. On an edge face on the anti-load side of the brake stator 31, a positioning hole 40 is provided. The motor with brake 100 has a projection 25 fitted to the positioning hole 40, and a cylindrical anti-load side bracket 21 with a brake internal contact surface 26 fitted to an external diameter of the brake stator 31.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a motor with a brake, a method for manufacturing a motor with a brake, and a method for manufacturing a motor series. [Background technology]

[0002] Some motors have a brake on the anti-load side of the motor to prevent the motor shaft from rotating together with the load when the motor is stopped. In such a motor with a brake, the axes of the brake and motor must be arranged parallel to each other so that the load is applied appropriately to the motor shaft when the brake is operating.

[0003] In Patent Document 1, a brake positioning plate is arranged between the brake stator of the brake and the motor, and has an annular end plate portion sandwiched between the end face of the motor and the end face of the brake stator, and a tubular portion protruding perpendicularly from the inner peripheral edge of the annular end plate portion toward the anti-output side and in contact with the inner peripheral surface of the brake stator, and the brake positioning plate is positioned relative to the motor, and the brake stator is positioned relative to the motor via the brake positioning plate. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-229973 Summary of the Invention [Problem to be solved by the invention]

[0005] In Patent Document 1, the brake is fastened to a brake positioning plate with screws, but because there is no positioning reference in the rotational direction, simply placing the brake on the brake positioning plate means that the screw holes for the bolts fastening the brake and motor do not align. To align the screw holes, it is necessary to rotate the brake while searching for the phase where the hole positions align, which is inefficient and poses issues such as increased costs due to longer assembly times.

[0006] The present disclosure has been made in consideration of the above, and aims to provide a motor with a brake that does not require adjustment of the position of the screw holes of the fastening bolts during assembly, thereby improving assembly efficiency, shortening assembly time, and reducing costs. [Means for solving the problem]

[0007] To solve the above-mentioned problems and achieve the object, the present disclosure provides a brake-equipped motor including a motor section having a stator and a rotor, a brake disc that applies a braking force to a motor shaft extending from the rotor, and a cylindrical brake stator that is arranged around the motor shaft and functions as an electromagnet to apply an electromagnetic force to the brake disc, and a brake that is arranged on the anti-load side of the motor shaft relative to the motor section. A positioning hole is provided on the end face on the anti-load side of the brake stator. The brake-equipped motor also includes a protrusion that fits into the positioning hole and a cylindrical first bracket that has an inscribed surface that fits around the outer diameter of the brake stator. [Effects of the Invention]

[0008] According to the brake-equipped motor of the present disclosure, there is no need to adjust the position of the screw holes of the fastening bolts during assembly, which has the effect of improving assembly efficiency, shortening assembly time, and achieving cost reduction. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is an external perspective view showing an external configuration of a brake-equipped motor according to a first embodiment; [Figure 2] FIG. 1 is a cross-sectional perspective view showing a vertical cross-sectional configuration of a motor with a brake according to a first embodiment; [Figure 3] FIG. 1 is a cross-sectional view showing a longitudinal cross-sectional configuration of a motor with a brake according to a first embodiment; [Figure 4] FIG. 1 is an exploded cross-sectional view showing a longitudinal cross-sectional configuration of a motor with a brake according to a first embodiment; [Figure 5]1 is a cross-sectional view showing the cross-sectional shapes of a protrusion and a positioning hole of a motor with a brake according to a first embodiment; [Figure 6] FIG. 1 is a cross-sectional view showing a vertical cross-sectional configuration of a standard motor not equipped with a brake according to a first embodiment; [Figure 7] FIG. 10 is a cross-sectional view showing a cross-sectional configuration of a brake stator and a non-load side bracket of a brake-equipped motor according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] A brake-equipped motor, a method for manufacturing a brake-equipped motor, and a method for manufacturing a motor series according to an embodiment will be described below with reference to the drawings.

[0011] Embodiment 1 The brake motor according to the first embodiment will be described in detail below with reference to the drawings. FIG. 1 is an external perspective view showing the external configuration of the brake motor 100 according to the first embodiment. FIG. 2 is a cross-sectional perspective view showing the longitudinal cross-sectional configuration of the brake motor 100 according to the first embodiment. FIG. 3 is a cross-sectional view showing the longitudinal cross-sectional configuration of the brake motor 100 according to the first embodiment. The brake motor 100 is a servo motor capable of feedback control based on the results of detecting the rotation of the brake motor 100. FIGS. 2 and 3 schematically show a cross-sectional configuration including the central axis N. In FIGS. 1 to 3, the lower side of the paper is the load side, where a load is connected to the brake motor 100, and the upper side of the paper is the anti-load side.

[0012] In the brake-equipped motor 100, the motor section 10, the brake 30, and the detector 50 are arranged in this order from the load side to the anti-load side.

[0013] The motor section 10 includes a stator 13 and a rotor 12 that is surrounded by the stator 13 and rotates around a shaft 11 serving as a motor axis. When a current flows through the stator 13, the brake motor 100 generates a magnetic field on the central axis N side of the stator 13, and the magnetic field generated by the stator 13 interacts with the magnetic field generated by the rotor 12 to rotate the rotor 12. The brake motor 100 transmits the rotational force of the rotor 12 to a load external to the brake motor 100 by rotating the shaft 11 together with the rotor 12.

[0014] The load side bracket 14, frame 16, counter-load side bracket 21, and detector cover 51 form the outer shell of the brake-equipped motor 100. The load side bracket 14 and frame 16 correspond to the second bracket, and the counter-load side bracket 21 corresponds to the first bracket. The stator 13 is press-fit into the frame 16. The load side bracket 14 is located on the load side of the frame 16. The load side bearing 15 is disposed within the load side bracket 14. The load side bearing 15 rotatably supports the shaft 11 on the load side of the rotor 12. The counter-load side bracket 21 is located on the counter-load side of the frame 16. The counter-load side bearing 22 rotatably supports the shaft 11 on the counter-load side of the rotor 12. The leaf spring 17 applies pressure to the load side bearing 15 to reduce vibration of the load side bearing 15.

[0015] In the first embodiment, the brake 30 is an electromagnetic brake and includes a brake disc 35 fixed in the rotational direction of the shaft 11, an annular armature 34 facing the brake disc 35 on the anti-load side, and an annular side plate 36 arranged around the shaft 11 at a position facing the brake disc 35 on the load side. In the first embodiment, the brake disc 35 has an internal gear shape and is fixed in the rotational direction of the shaft 11 via an external gear-shaped brake hub 37 fixed around the shaft 11, but is not fixed in the axial direction. A braking force is applied to the shaft 11 by the brake disc 35.

[0016] The brake stator 31 includes a coil 32, which functions as an electromagnet when the coil 32 is energized to excite the brake stator 31. The side plate 36 is fixed to the brake stator 31 at three equally spaced locations on the same circumference centered on the central axis N using a collar 38, bolts 39, and screw holes 49. Therefore, a gap between the side plate 36 and the brake stator 31 is formed by the thickness of the collar 38, and the armature 34 and brake disc 35 are located within this gap. The brake stator 31 includes an operating spring 33 that urges the armature 34 toward the brake disc 35. Therefore, when the coil 32 of the brake stator 31 is not energized, the operating spring 33 sandwiches the brake disc 35 between the armature 34 and the side plate 36, and the resulting frictional force applies a braking force to the shaft 11. In contrast, when the coil 32 of the brake stator 31 is energized, the armature 34 is attracted to the brake stator 31 against the operating spring 33, creating a gap between the armature 34 and the brake disc 35, and the brake disc 35 becomes free.

[0017] The counter-load side bracket 21 is cylindrical, and houses the counter-load side bearing 22 and the brake 30 inside.

[0018] The outer ring side surface of the non-load side bearing 22 fits into the bearing inscribed surface 20 provided on the non-load side end surface of the non-load side bracket 21. The non-load side end surface of the outer ring of the non-load side bearing 22 comes into contact with the non-load side bracket 21. The load side corner of the bearing inscribed surface 20 is chamfered 29.

[0019] The brake stator 31, which forms the exterior of the brake 30, has a cylindrical shape. The outer diameter side of the brake stator 31 fits into the brake inscribed surface 26 of the anti-load side bracket 21. This aligns the central axes of the brake 30 and the anti-load side bracket 21. The diameter of the load-side opening of the anti-load side bracket 21 is larger than the outer diameter of the brake stator 31, and a tapered portion 27 smoothly connects the diameter of the load-side opening to the diameter of the brake inscribed surface 26. The tapered portion 27 does not need to be provided around the entire circumference of the opening of the anti-load side bracket 21; it is sufficient if it is provided in three or more locations on the circumference.

[0020] The surface of the counter-load side bracket 21 that contacts the counter-load side end face of the brake stator 31 is called the contact surface 23. A protrusion 25 extending toward the load side is provided on the contact surface 23, and a positioning hole 40 into which the protrusion 25 is inserted is provided on the counter-load side end face of the brake stator 31. The length of the protrusion 25 is such that the tip of the protrusion 25 is contained within the area surrounded by the brake inscribing surface 26. The positioning hole 40 is provided near the outer edge of the brake stator 31 so as not to overlap with the coil 32. The counter-load side bracket 21 and the brake 30 are fixed at three equally spaced locations on the same circumference centered on the central axis N using bolts 24, fastening holes 41 in the counter-load side bracket 21, and threaded holes 42 in the brake stator 31. In the first embodiment, the positioning holes 40 into which the protrusions 25 are inserted and threaded holes 49 into which bolts 39 for fastening the side plate 36 to the brake stator 31 are inserted are located at the same positions, and the positioning holes 40 are tapped holes. Furthermore, the screw hole 49 and the positioning hole 40 communicate with each other.

[0021] The detector 50 has a disk 52 attached to the shaft 11 and a circuit board 53, which is a circuit section for generating an electrical signal indicative of the detection result of the rotational position of the shaft 11. The rotational position represents the rotation angle around the central axis N. The detector 50 has a housing 54 that covers the surface of the circuit board 53 facing the load side and accommodates the disk 52. The end of the shaft 11 on the anti-load side fits inside the housing 54. The disk 52 is attached to the end of the shaft 11. Because the housing 54 is attached to the anti-load side bracket 21, the detector 50 is supported in the space surrounded by the detector cover 51 and the anti-load side bracket 21.

[0022] Detector 50 is a rotary encoder that converts the amount of mechanical displacement due to rotation into an electrical signal and detects the rotational position by processing the electrical signal. Detector 50 in the first embodiment is an optical encoder that detects light transmitted through or reflected by disk 52 and detects the rotational position of shaft 11 based on the pattern of the detected light. Detector 50 may also be a magnetic encoder that detects the rotational position of shaft 11 based on an electrical signal obtained by detecting a change in the magnetic field due to the rotation of a permanent magnet or induction coil.

[0023] Next, a method for assembling the brake motor 100 will be described with reference to Fig. 4. Fig. 4 is an exploded cross-sectional view showing the vertical cross-sectional configuration of the brake motor 100 according to the first embodiment.

[0024] First, the stator 13 is fitted into the frame 16, and the load side bracket 14 is screwed to the frame 16. The configuration including the stator 13, frame 16, and load side bracket 14 is called a stator subassembly 61.

[0025] Next, the load side bearing 15 and brake hub 37 are press-fitted onto the shaft 11 with the rotor 12 assembled. The brake 30, which was assembled in a separate process, is inserted onto the shaft 11, and the external gear of the brake hub 37 is fitted into the internal gear of the brake disc 35. Furthermore, the non-load side bearing 22 is press-fitted onto the shaft 11. The configuration including the shaft 11, load side bearing 15, brake hub 37, brake 30, and non-load side bearing 22 is called a rotor subassembly 62.

[0026] Next, the rotor sub-assembly 62 is inserted into the anti-load side bracket 21, and the brake stator 31 is fitted into the brake inscribed surface 26. At the same time, the anti-load side bearing 22 is fitted into the bearing inscribed surface 20. If the axial positions of these components are not aligned when fitting them together, the end faces will get caught and cause scratches. In the first embodiment, because of the tapered portion 27, the axes automatically align without the assembly worker having to adjust the central axes of the brake stator 31 and the brake inscribed surface 26.

[0027] Similarly, the shaft of the non-load side bearing 22 and bearing inscribed surface 20 is automatically conformed by the chamfer 29. Thereafter, when the non-load side end face of the brake stator 31 reaches the tip of the protrusion 25, the brake stator 31 is rotated. The protrusion 25 and the positioning hole 40 are then fitted together by their own weight at a rotational position where they coincide, and the brake stator 31 is inserted until it contacts the contact surface 23. In this way, the axial position is determined by the fit between the brake stator 31 and the brake inscribed surface 26, and the rotation direction is determined by the fit between the protrusion 25 and the positioning hole 40. As a result, the screw holes 42 of the brake stator 31, which are fastened with the bolts 24, automatically align with the fastening holes 41 of the non-load side bracket 21.

[0028] If the protrusion 25 and the positioning hole 40 were not provided, the assembly worker would visually check and adjust the alignment of the fastening hole 41 and the screw hole 42, but in the first embodiment, this adjustment is not necessary.

[0029] FIG. 5 is a cross-sectional view showing the cross-sectional shapes of the protrusion 25 and the positioning hole 40 of the brake motor 100 according to the first embodiment. As shown in FIG. 5, the cross section of the protrusion 25 is diamond-shaped. The protrusion 25 is arranged on the brake stator 31 so that one longer diagonal of the diamond is aligned with the circumferential direction of the brake stator 31 and the other shorter diagonal of the diamond is aligned with the radial direction of the brake stator 31. The length of the longer diagonal is approximately the same as the inner diameter of the cylindrical positioning hole 40. This creates a gap between the shorter diagonal of the protrusion 25 and the positioning hole 40, preventing excessive restraint due to the fit between the protrusion 25 and the positioning hole 40.

[0030] In the first embodiment, the non-load side bracket 21 covers the non-load side bearing 22 from the non-load side. Therefore, the process of press-fitting parts such as the load side bearing 15, brake hub 37, and non-load side bearing 22 onto the shaft 11 is integrated into the assembly process of the rotor sub-assembly 62. This makes it possible to share the press-fitting device, improving area productivity.

[0031] Next, the non-load side bracket 21 is attached to the stator sub-assembly 61. The outer edge of the end face of the frame 16 and the outer edge of the non-load side bracket 21 that contacts it form a spigot joint 43, which are fitted together and fixed. In this way, the perpendicularity of the brake 30 relative to the non-load side bracket 21 is determined by the contact surface 23, and the coaxiality is determined by the brake inscribed surface 26. The perpendicularity and coaxiality of the non-load side bracket 21 relative to the frame 16 are determined by the spigot joint 43. Therefore, the brake 30 can be properly positioned relative to the motor unit 10. Improving the precision of the outer shape of the brake stator 31, the brake inscribed surface 26, the contact surface 23, and the spigot joint 43 through secondary machining increases assembly precision.

[0032] Finally, the housing 54 is fixed to the counter-load side end face of the counter-load side bracket 21, the disk 52 is fixed to the counter-load side end face of the shaft 11, the circuit board 53 is fixed to the housing 54, and then the detector cover 51 is fixed.

[0033] Fig. 6 is a cross-sectional view showing the vertical cross-sectional configuration of a standard motor 101 not equipped with a brake 30 according to the first embodiment. As shown in Fig. 6, the stator subassembly 61, which is composed of the stator 13, frame 16, and load side bracket 14 of the standard motor 101, is common to the brake-equipped motor 100. The detector 50 is also common to the standard motor 101 and the brake-equipped motor 100. The standard motor 101 uses the anti-load side bracket 21b for the standard motor 101. Therefore, when manufacturing a motor series consisting of a brake-equipped motor 100 and a standard motor 101, the process of manufacturing the stator subassembly 61 (fitting the stator 13 into the frame 16 and screwing the load side bracket 14 to the frame 16) and the process of assembling the detector 50 (fixing the housing 54 to the anti-load side end face of the anti-load side bracket 21, fixing the disk 52 to the anti-load side end face of the shaft 11, fixing the circuit board 53 to the housing 54, and then fixing the detector cover 51) can be shared.

[0034] In this way, by sharing sub-assemblies, the sub-assemblies can be stocked, which reduces inventory compared to having separate parts stocks. Furthermore, the number of processes from order receipt is reduced, which shortens lead time.

[0035] Thus, according to embodiment 1, a positioning hole 40 is provided on the anti-load side end face of brake stator 31, and cylindrical anti-load side bracket 21 has protrusion 25 that fits into positioning hole 40 and brake inscribing surface 26 that fits into the outer diameter of brake stator 31. Therefore, there is no need to adjust the position of the screw hole of the fastening bolt during assembly, which improves assembly efficiency, shortens assembly time, and reduces costs.

[0036] In addition, in embodiment 1, the anti-load side bracket 21 and the frame 16 are fitted together using a spigot structure, which increases the coaxial accuracy of the center of the motor unit 10 and the center of the brake 30 via the anti-load side bracket 21, thereby improving quality.

[0037] Furthermore, in embodiment 1, the cross-sectional shape of protrusion 25 is a diamond, and the diamond is arranged on brake stator 31 so that one diagonal of the diamond runs along the circumferential direction of brake stator 31 and the other diagonal of the diamond runs along the radial direction of brake stator 31, and the length of one diagonal is shorter than the length of the other diagonal. Therefore, when positioning protrusion 25 and positioning hole 40, a gap can be provided in the radial direction of brake stator 31, and excessive positioning constraint by positioning hole 40 and protrusion 25 can be avoided, reducing assembly defects.

[0038] Furthermore, in embodiment 1, the tip of the protrusion 25 is contained within the area surrounded by the brake inscribed surface 26, so the outer diameter of the brake stator 31 is fitted first, and then the protrusion 25 is fitted, and the adjustment direction for aligning the positions of the protrusion 25 and the positioning hole 40 is only one-dimensional (rotational direction), reducing the assembly labor hours.

[0039] Furthermore, in embodiment 1, the screw holes 49 for fastening the side plate 36 to the brake stator 31 are provided at the same positions as the positioning holes 40, and the screw holes 49 and the positioning holes 40 are connected, thereby reducing the number of steps required to machine the holes.

[0040] Furthermore, in the first embodiment, anti-load side bracket 21 has an opening on the load side of shaft 11 that has a diameter larger than the outer diameter of brake stator 31, and tapered portions 27 that smoothly connect the opening and brake inscribed surface 26 are provided at three or more locations along the circumferential direction of the opening. Therefore, when brake stator 31 is inserted into anti-load side bracket 21 and fitted with brake inscribed surface 26, brake stator 31 moves along tapered portions 27, and the axes automatically follow each other without the need to adjust the central axes of brake stator 31 and anti-load side bracket 21. This eliminates the need to adjust the axial position, reducing the number of assembly steps.

[0041] Furthermore, in the first embodiment, the non-load side bearing 22 press-fitted onto the shaft 11 is configured to be covered from the non-load side by the non-load side bracket 21, so the process of press-fitting parts such as the load side bearing 15, brake hub 37, and non-load side bearing 22 onto the shaft 11 is integrated into the assembly process of the rotor sub-assembly 62. This makes it possible to share the press-fitting device, improving area productivity.

[0042] Embodiment 2 7 is a cross-sectional view showing the cross-sectional configuration of brake stator 31 and non-load side bracket 21 of a brake-equipped motor according to embodiment 2. Brake 30 has a groove 44 extending in the axial direction on the side surface of brake stator 31. Non-load side bracket 21 is provided with guide 28 that fits into groove 44. Guide 28 is provided at the entrance to a hole in the opening of non-load side bracket 21.

[0043] According to embodiment 2, groove 44 is provided on the side surface of brake stator 31, and guide 28 that fits into groove 44 is provided on anti-load side bracket 21. Therefore, when an assembly worker inserts rotor sub-assembly 62 into anti-load side bracket 21, the rotational phase can be aligned at the beginning of the insertion, improving workability and shortening the assembly time.

[0044] The configurations shown in the above embodiments are examples of the contents of the present disclosure, and may be combined with other known technologies, or the embodiments may be combined as appropriate, and part of the configuration may be omitted or modified within the scope of the gist of the present disclosure. [Explanation of symbols]

[0045] 10 motor part, 11 shaft, 12 rotor, 13 stator, 14 load side bracket, 15 load side bearing, 16 frame, 17 leaf spring, 20 bearing inscribed surface, 21, 21b counter-load side bracket, 22 counter-load side bearing, 23 contact surface, 24, 39 bolt, 25 protrusion, 26 brake inscribed surface, 27 tapered portion, 28 guide, 29 chamfer, 30 brake, 31 brake stator, 32 coil, 33 operating spring, 34 armature, 35 brake disc, 36 side plate, 37 brake hub, 38 collar, 40 positioning hole, 41 fastening hole, 42, 49 screw hole, 43 spigot, 44 groove, 50 detector, 51 detector cover, 52 disc, 53 circuit board, 54 housing, 61 Stator sub-assembly, 62 rotor sub-assembly, 100 motor with brake, 101 standard motor, N central shaft.

Claims

1. a motor section including a stator and a rotor; a brake disc that applies a braking force to a motor shaft extending from the rotor; and a cylindrical brake stator that is disposed around the motor shaft and functions as an electromagnet to apply an electromagnetic force to the brake disc, the brake being disposed on the anti-load side of the motor shaft with respect to the motor section, A positioning hole is provided on the end surface of the brake stator on the anti-load side, a cylindrical first bracket having a projection that fits into the positioning hole and an inscribed surface that fits into the outer diameter of the brake stator; A brake-equipped motor characterized by:

2. The stator is fixed to a second bracket, and the first bracket and the second bracket are fitted together by a spigot structure.

2. The brake-equipped motor according to claim 1.

3. The cross-sectional shape of the protrusion is a rhombus, and the rhombus is arranged on the brake stator so that one diagonal of the rhombus is along the circumferential direction of the brake stator and the other diagonal of the rhombus is along the radial direction of the brake stator, and the length of the one diagonal is shorter than the length of the other diagonal.

2. The brake-equipped motor according to claim 1.

4. The tip of the protrusion is located within the area surrounded by the inscribed surface.

2. The brake-equipped motor according to claim 1.

5. The brake has an armature and a side plate that face each other with the brake disc in between, A screw hole for fastening the side plate to the brake stator is provided at the same position as the positioning hole on the load side end face of the brake stator, and the screw hole and the positioning hole are in communication with each other.

2. The brake-equipped motor according to claim 1.

6. The first bracket is The load side of the motor shaft has an opening with a diameter larger than the outer diameter of the brake stator, and tapered portions that smoothly connect the opening and the inscribed surface are provided at three or more locations along the circumferential direction of the opening.

2. The brake-equipped motor according to claim 1.

7. the brake stator has a groove on a side surface thereof extending in the motor axial direction, The opening of the first bracket includes a guide that fits into the groove.

7. The brake-equipped motor according to claim 6.

8. The counter-load side bearing press-fitted onto the motor shaft is covered from the counter-load side by a first bracket.

3. The brake-equipped motor according to claim 2.

9. A method for manufacturing a brake-equipped motor according to claim 8, comprising the steps of: assembling a stator subassembly including the stator and the second bracket; Attaching a rotor subassembly including a load side bearing, a brake hub, the brake, and a non-load side bearing to the motor shaft on which the rotor is assembled; Attaching the first bracket to the rotor subassembly attached to the motor shaft on which the rotor is mounted; Attaching the stator subassembly to the motor shaft on which the rotor is mounted, the rotor subassembly and the first bracket being attached to the motor shaft; Equipped with In the step of attaching the first bracket to the rotor subassembly, the projection is inserted into the positioning hole to perform positioning. A method for manufacturing a motor with a brake, comprising:

10. 9. A method for manufacturing a motor series including a first motor that is the brake-equipped motor according to claim 8, a stator subassembly including the stator and the second bracket, and a second motor having a motor shaft with a rotor mounted thereon, but not having the brake, comprising: The step of assembling the stator subassembly including the stator and the second bracket for the first motor and the second motor is carried out on the same line. A method for manufacturing a motor series.

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