JP5683003B2 - Cogging torque inspection method and cogging torque inspection apparatus - Google Patents

Description

  The present invention relates to an inspection method and an inspection apparatus for a cogging torque of a motor.

  Conventionally, a stator of a brushless motor includes a stator core having an annular portion and a plurality of teeth portions projecting radially inward from the annular portion, and coils each having a winding wound around each tooth portion. Is fixed to the motor case by press fitting or shrink fitting. As a stator core of such a stator, for example, as shown in Patent Document 1, a plurality of divided portions each having a divided annular portion having a shape obtained by dividing the annular portion in the circumferential direction and the teeth portion protruding from the divided annular portion. Some have a core, and the winding work is facilitated by winding a winding around a tooth portion before the divided annular portion is formed into an annular shape.

  However, in the case where the stator core is constituted by the divided cores as described above, each divided core must be arranged and fixed in an annular shape. Therefore, compared to a stator core in which a plurality of teeth are integrally formed, the stator core has a perfect circle. The problem that it is easy to invite the fall of a degree etc. arises. When the roundness of the stator core is lowered, there is a problem that the air gap between the stator core and the rotor magnet is likely to be non-uniform and the cogging torque is increased. Thus, for example, in the manufacturing method disclosed in Patent Document 1, each divided core is arranged in an annular shape by following the tip of the teeth portion of each divided core to the core, and pressure is applied radially inward from the outer periphery of the annular divided core. The inner diameter accuracy of the stator core is ensured by welding the divided annular portions of the divided cores while applying.

JP 2009-268179 A

  However, when the dimensional accuracy of the split core is poor, there is a case where the effect of reducing the predetermined cogging torque cannot be obtained even by the manufacturing method of Patent Document 1. Therefore, after manufacturing a split core, if the dimensional accuracy of a split core of a lot is unsatisfactory and there is a risk of cogging torque failure in a motor using the split core, several units in that lot are preceded. Complete the assembly line and inspect the cogging torque of the completed motor. The inspection of the cogging torque is performed by analyzing a torque characteristic (torque waveform) detected when the rotating shaft of the motor is forcibly rotated. Then, after the cogging torque is inspected, it is conceivable to determine whether or not the assembly line in the lot can flow based on the inspection result. However, with this method, the number of defective motors in a completed state due to defective cogging torque can be suppressed, but since it is necessary to manufacture several motors in a lot, the time required for inspection of the cogging torque is reduced. As a result, there is a problem that the productivity of the motor is lowered and the manufacturing time is increased.

  The present invention has been made in order to solve the above-described problems, and its object is to reduce the time required for inspection and improve the productivity of the motor, and a cogging torque inspection method and cogging torque can be improved. It is to provide an inspection device.

In order to solve the above problems, the invention according to claim 1 is an arrangement step in which a core metal is arranged on the inner peripheral side of a plurality of divided cores arranged in an annular shape, and a cylindrical pressure jig is arranged on the outer peripheral side. And after the said arrangement | positioning process, while applying the pressing force to the said division | segmentation core to a radial inside with the said pressurization jig, the said division | segmentation cores adjacent to the circumferential direction are crimped | bonded, and each said division | segmentation core A core crimping step in which the pressure jig and the pressure jig are crimped in a radial direction, and after the core crimping step, the cores are separated from the cores while the annular split cores are held in the pressure jig. The gold is removed, and thereafter each of the annular divided cores held in the pressure jig and under pressure from the pressure jig , and a reference provided rotatably on the inner peripheral side of the divided core Measurement that measures cogging torque using a pseudo motor for inspection consisting of a rotor. Characterized by a step.

  In the present invention, the inspection of the cogging torque is carried out using the inspection pseudo motor rather than the finished motor. The inspection pseudo motor includes a pressure jig and an annular divided core that is crimped into the pressure jig by a cored bar, and a reference rotor provided on the inner peripheral side thereof. For this reason, in manufacturing a pseudo motor for inspection, it is accompanied by a process of fixing adjacent divided cores by welding, for example, a process of mounting bobbins or coils on each divided core, and a process of mounting coils. Necessary steps for electrical connection of coil wires can be omitted. As a result, in the present invention, the time required for the inspection of the cogging torque can be shortened and the productivity of the motor can be improved as compared with the case where the inspection is performed using the finished product of the motor. In addition, if the pressure applied by the pressurizing jig is equal to the pressure received from the motor case by a split core that is press-fitted or shrink-fitted to the motor case in the finished motor product, the inspection accuracy of the inspection pseudo motor can be improved. Thus, it becomes possible to make the inspection accuracy of the cogging torque using the motor of the finished product approximately the same.

According to a second aspect of the present invention, in the method for inspecting a cogging torque according to the first aspect, the pressing jig is configured to be expandable and contractible.
In the present invention, it is possible to suitably apply a pressing force inward in the radial direction to the annularly arranged divided cores.

According to a third aspect of the present invention, in the method for inspecting a cogging torque according to the first or second aspect, the cored bar is configured to be expandable and contractible.
In the present invention, the cored bar can be easily pulled out by reducing the diameter of the cored bar when the cored bar is removed from the annularly arranged divided cores.

According to a fourth aspect of the present invention, in the cogging torque inspection method according to any one of the first to third aspects, the cylindrical outer shell member included in the pressurizing jig has an inner peripheral surface as an axis. The end of the outer shell member is covered with an end frame after the core crimping step, and the end is covered with an end frame. The positioning of the end frame in the axial direction is performed by bringing a positioning portion protruding from the inner side of the outer shell member in the frame into contact with the inner peripheral surface of the outer shell member .
A fifth aspect of the present invention is the cogging torque inspection method according to any one of the first to fourth aspects, wherein the pressurizing jig includes a cylindrical outer shell member and an inner shell member. A pressurizing member to be fitted, and an inner peripheral surface of the outer shell member and an outer peripheral surface of the pressurizing member are formed in a taper shape whose diameter is reduced toward one end side in the axial direction of the pressurizing jig. In the core crimping step, a pressing force inward in the radial direction is applied to each of the divided cores by pressing the pressure member fitted in the outer shell member toward the one axial end side. It is characterized by doing.

The invention according to claim 6 includes a cored bar arranged on the inner peripheral side of the plurality of divided cores arranged in an annular shape, and a cylindrical pressure jig arranged on the outer peripheral side of the divided cores, By applying a pressing force inward in the radial direction to each divided core by the pressure jig, the divided cores adjacent in the circumferential direction are pressure-bonded to each other, and each divided core and the pressure jig are was crimped radially, after removing the core bar from the split core remains in a state of being held with the respective split cores annularly in the pressurizing jig, the pressurized they held within the pressing jig Each of the annular divided cores in a state where pressure is applied from the pressure jig and a reference rotor rotatably provided on the inner peripheral side of the divided cores constitute an inspection pseudo motor, and the inspection pseudo motor is used. And measuring cogging torque.

  In the present invention, the cogging torque can be inspected by using a pseudo motor for inspection instead of a completed motor. The inspection pseudo motor includes a pressure jig and an annular divided core that is crimped into the pressure jig by a cored bar, and a reference rotor provided on the inner peripheral side thereof. For this reason, in manufacturing a pseudo motor for inspection, for example, a step of fixing adjacent divided cores by welding, a step of attaching bobbins or coils to each divided core, and a step of attaching coils. Necessary steps for electrical connection of coil wires can be omitted. As a result, in the present invention, the time required for the inspection of the cogging torque can be shortened and the productivity of the motor can be improved as compared with the case where the inspection is performed using the finished product of the motor. In addition, if the pressure applied by the pressurizing jig is equal to the pressure received from the motor case by a split core that is press-fitted or shrink-fitted to the motor case in the finished motor product, the inspection accuracy of the inspection pseudo motor can be improved. Thus, it becomes possible to make the inspection accuracy of the cogging torque using the motor of the finished product approximately the same.

  Therefore, according to the above-described invention, it is possible to shorten the time required for the inspection and improve the productivity of the motor.

(A) is a top view of the brushless motor in this embodiment, (b) is the sectional view on the AA line in Fig.1 (a). (A) is the top view which looked at the stator from the holder side, (b) is the BB sectional drawing in Fig.2 (a). The top view of a stator core. (A) is sectional drawing which shows a pressurization jig | tool typically, (b) is a top view which shows a pressurization jig | tool typically. Explanatory drawing for demonstrating a core crimping | compression-bonding process. Sectional drawing which shows typically the pseudo motor for a test | inspection.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
First, before explaining the cogging torque inspection method and inspection apparatus of this embodiment, a brushless motor including a stator (stator core) to be inspected will be described.

  As shown in FIGS. 1A and 1B and FIGS. 2A and 2B, the motor case 2 of the brushless motor 1 is formed in a bottomed cylindrical shape, and the inner peripheral surface thereof has a substantially cylindrical shape. The stator 3 is press-fitted (or fixed by shrinkage). Inside the stator 3, a rotor 5 is rotatably arranged via a bearing 4 provided at the bottom center of the motor case 2. In addition, a cylindrical rotor core 7 is fixed to the rotating shaft 6 constituting the rotor 5, and the outer peripheral surface of the rotor core 7 is magnetized with different polarities (N pole, S pole) at predetermined angles. A magnet 8 is fixed. A holder 9 made of an insulating synthetic resin material is fixed to the end of the stator 3 on the opening side of the motor case 2, and the holder 9 covers one end in the axial direction of the stator 3. Yes.

  As shown in FIGS. 2A and 2B and FIG. 3, the stator core 10 constituting the stator 3 includes twelve divided cores 11 having a T-shape when viewed in the axial direction and connected in the circumferential direction. It is configured in an annular shape. Each divided core 11 includes a divided annular portion 12 having an arc shape when viewed from the axial direction, and a tooth portion 13 extending radially inward from the circumferential central portion of the divided annular portion 12. Each divided core 11 is formed by laminating a plurality of (for example, several tens) electromagnetic steel sheets in the axial direction of the divided core 11, and the electromagnetic steel sheets are caulked in the axial direction and integrated. In the present embodiment, the divided cores 11 are fixed by laser welding at both circumferential ends of the divided annular portion 12. As shown in FIG. 2, each of the split cores 11 is provided with a bobbin 14 that covers both end surfaces in the axial direction and both side surfaces in the circumferential direction of each split core 11 from both sides in the axial direction. And the coil 16 is each wound by the teeth part 13 by winding the coil | winding 15 several times by concentrated winding from on the bobbin 14. FIG.

  As shown in FIG. 1A, the connection end 16 a of each coil 16 is pulled out to the surface of the holder 9 opposite to the stator 3 and arranged on the surface of the holder 9 opposite to the stator 3. Each of the terminals 17 is connected to a plurality (four in this embodiment) of terminals 17. In the brushless motor 1 configured as described above, a three-phase excitation current is supplied from a driving power source (not shown) through each terminal 17 (in this embodiment, three arranged on the upper side in FIG. 1A). When supplied to each coil 16, each coil 16 is excited to generate a rotating magnetic field in the stator 3, and the rotor 5 is rotated based on the rotating magnetic field.

[Cogging torque inspection method]
Next, a method for inspecting the cogging torque performed in the manufacturing process of the brushless motor 1 of the present embodiment will be described with reference to FIGS.

The cogging torque inspection apparatus according to the present embodiment includes a cored bar 21 illustrated in FIG. 5, a pressing jig 31 illustrated in FIGS. 4A, 4 </ b> B, and 5, and a reference rotor 41 illustrated in FIG. 6. .
First, the core metal 21 for forming the stator core 10 by forming the divided core 11 into an annular shape will be described. As shown in FIG. 5, the cored bar 21 includes a shaft 22. The shaft 22 is composed of a cylindrical portion 22a having the same diameter in the axial upper portion, and a tapered portion 22b having a substantially conical shape whose diameter decreases toward the lower axial end portion in the axial lower portion. Is formed.

  The cylindrical portion 22a of the shaft 22 penetrates the base portion 23a and the holder portion 23b arranged in the axial direction, and a spring 23c penetrating the holder portion 23b is extrapolated to the cylindrical portion 22a. The lower end of the spring 23c is in contact with the upper surface of the holder portion 23b, and the upper end of the spring 23c is in contact with a spring stopper 24a fixed to the upper end portion of the shaft 22. The spring stopper 24a is fixed to the upper end of the shaft 22 by being fastened together by a fixing nut 24b. As a result, the spring 23c biases the shaft 22 upward.

  On the outer periphery of the taper portion 22b of the cored bar 21, a split core arrangement portion 25 composed of three expansion / contraction portions 25a arranged in the circumferential direction is provided. The inner peripheral surface of each expansion / contraction portion 25 a is a tapered surface 25 b that increases in diameter toward the upper side in the axial direction, and the tapered surface 25 b is in contact with the tapered portion 22 b of the shaft 22. As a result, when the shaft 22 is slid downward in the axial direction, each expanding / contracting portion 25a expands in diameter while being in sliding contact with the tapered portion 22b, and conversely, when the shaft 22 is slid upward in the axial direction, each expanding / contracting portion 25a is The diameter is reduced while being in sliding contact with the tapered portion 22b. As described above, the outer diameter of the divided core arrangement portion 25 including the expansion / contraction portions 25a can be expanded / contracted.

  At the lower end of the shaft 22, a cap 26 that can be engaged with each expansion / contraction portion 25 a is provided. A positioning portion 27 that can be engaged with each expansion / contraction portion 25a is provided on the lower surface of the holder portion 23b. The cap 26 and the positioning part 27 are for determining the outer diameter of the split core arrangement part 25. Note that an axial positioning portion 28 for positioning the stator core 10 in the axial direction is provided on the outer peripheral surface of the positioning portion 27.

  As shown in FIGS. 4 and 5, the pressurizing jig 31 includes a cylindrical outer shell member 32, a closing member 33 that closes one axial end (lower end in FIGS. 4 and 5) of the outer shell member 32, It consists of a pressure member 34 fitted in the outer shell member 32, and has a substantially bottomed cylindrical shape as a whole.

  The outer shell member 32 has an open end 32 a at the axial end opposite to the closing member 33. The inner peripheral surface 32b of the outer shell member 32 is formed in a taper shape whose diameter is reduced from the opening end portion 32a to the end portion on the closing member 33 side. The closing member 33 has a substantially disk shape, and a bearing housing portion 33a is formed at the center thereof so as to protrude outward. The closing member 33 is fixed to the outer shell member 32 with a plurality of screws 33b.

  Three pressure members 34 are provided at equal intervals in the circumferential direction. As shown in FIG. 4B, each pressing member 34 has an arc shape along the inner peripheral surface 32b of the outer shell member 32 when viewed from the axial direction. As shown in FIG. 4A, the outer peripheral surface 34 a of each pressing member 34 is formed in a tapered shape that decreases in diameter toward the closing member 33 side (lower side) in the axial direction. Thereby, each pressurizing member 34 is reduced in diameter while being in sliding contact with the inner peripheral surface 32b of the outer shell member 32 as it moves downward in the axial direction.

  The reference rotor 41 is the same component (that is, a rotor used as a product) as the rotor 5 used in the brushless motor 1 that is a finished product, and the reference rotor 41 in FIG. 6 schematically shows the rotor 5. It is desirable to prepare several reference rotors 41 having similar characteristic values.

Next, a method for inspecting the cogging torque will be described in detail.
As shown in FIG. 3, after the split core 11 is formed from the electromagnetic steel sheet, the split core 11 is formed into a substantially annular shape with the bobbin 14 and the coil 16 not attached (arrangement step). On the other hand, after inserting the split core arrangement part 25 of the cored bar 21 from the open end 32a side inside the outer shell member 32 and the pressure member 34 of the pressing jig 31, the annularly arranged split cores 11 are arranged. From the side opposite to the opening end portion 32a, the outer core is fitted to the split core arrangement portion 25. Thereby, each divided core 11 is annularly arranged between the radial directions of the divided core arrangement part 25 and the pressure member 34.

  At this time, the split core 11 is positioned in contact with the axial positioning portion 28 of the core metal 21 in the axial direction. At this time, the outer diameter of the split core placement portion 25 is reduced to facilitate the insertion of each split core 11 into the inner peripheral side. Thereafter, the diameter of the split core arrangement portion 25 is increased to a predetermined size, and the outer peripheral surface thereof is brought into contact with the tip end portion 13a (the radially inner end portion) of the tooth portion 13 of each split core 11.

  Next, the closing member 33 is attached to the outer shell member 32. Thereafter, the ring member 35 is brought into contact with the axially upper end portion (end portion on the opening end portion 32a side) of each pressure member 34 in the axial direction, and each pressure member 34 is axially moved by the ring member 35. Press downward (the closing member 33 side) (core crimping step). At this time, a pressing force is applied to the pressure member 34 with a uniform force over the circumferential direction. Then, each pressing member 34 is reduced in diameter while being in sliding contact with the outer shell member 32, and presses each divided core 11 radially inward on the inner peripheral surface thereof. This radially inward pressing force is uniform over the circumferential direction, and a pressure equivalent to the pressure applied to the stator core 10 from the motor case 2 in the finished brushless motor 1 is applied. . By this step, the divided annular portions 12 of the divided cores 11 adjacent to each other in the circumferential direction are pressure-bonded, and the outer peripheral surface of the divided annular portion 12 of each divided core 11 and the inner peripheral surface of the pressure member 34 are in the radial direction. Crimped.

  After the core crimping step, the split core arrangement portion 25 is reduced in diameter, and the cored bar 21 is pulled out from the stator core 10 in the axial direction. As a result, the state in which the stator core 10 (the annular divided cores 11) is held in the pressure jig 31 is maintained, and the inspection pseudo-stator composed of the pressure jig 31 and the stator core 10 is completed.

  Thereafter, as shown in FIG. 6, the reference rotor 41 is arranged on the inner peripheral side of the stator core 10 of the pseudo stator. The base end portion of the rotation shaft 6 of the reference rotor 41 is rotatably supported by a bearing 36 a provided in the bearing housing portion 33 a of the closing member 33. The distal end of the rotary shaft 6 passes through the center of an end frame 38 fixed to the open end 32 a of the outer shell member 32 with a screw 37 and is supported by a bearing 36 b held by the end frame 38. It is rotatably supported. The end frame 38 is formed with a cylindrical positioning portion 38 a that protrudes to the inside of the pressing jig 31, and the positioning portion 38 a contacts the inner peripheral surface 32 b of the outer shell member 32 in the axial direction. The end frame 38 is axially positioned by contact. As described above, the pressure jig 31, the stator core 10 (pseudo stator), the reference rotor 41, and the end frame 38 constitute the inspection pseudo motor 50.

  Next, the cogging torque is measured using the inspection pseudo motor 50 (measurement process). Cogging torque is measured by analyzing torque characteristics (torque waveform) detected when the reference rotor 41 is forcibly rotated by a driving means (not shown) via a joint 51 provided at the tip of the rotating shaft 6. It is done by doing.

  Thereafter, when it is determined that the cogging torque is poor based on the measurement result, the cause of the decrease in the dimensional accuracy of the split core 11 is determined, and the problem in the manufacturing process of the split core 11 is improved (the material of the split core 11, Consider material placement and fixation, press pressure during manufacturing, press die position or press die correction, punch / die position adjustment, die polishing (edge toothing), etc.

Next, the operation of this embodiment will be described.
In the present embodiment, the inspection of the cogging torque is performed using the inspection pseudo motor 50 instead of the finished product of the brushless motor 1, and the inspection pseudo motor 50 is pressurized by the pressing jig 31 and the cored bar 21. The stator core 10 is crimped into the tool 31 and a reference rotor 41 provided on the inner peripheral side thereof. In the core crimping process of the stator core 10 at the time of manufacturing the inspection pseudo motor 50, a pressure equivalent to the pressure applied to the stator core 10 from the motor case 2 in the finished brushless motor 1 is applied. For this reason, it is possible to measure the cogging torque with the same accuracy as in the case of inspecting with the finished product of the brushless motor 1.

  In the production of the inspection pseudo motor 50, a step of fixing adjacent divided cores 11 by, for example, welding, a step of attaching the bobbin 14 and the coil 16 to each divided core 11, and a step of attaching the coils 16. The step of electrical connection of the coil wire (connection end portion 16a), which is necessary accompanying the above, is omitted. Thereby, in the inspection method of this embodiment, the time required for the inspection of the cogging torque is shortened compared with the case where the inspection is performed using the finished product of the brushless motor 1. For this reason, when it is determined that the cogging torque is defective based on the measurement result, it is possible to quickly cope with improvement of problems in the manufacturing process of the split core 11. In addition, parts management loss and confirmation man-hours can be reduced.

Next, characteristic effects of the present embodiment will be described.
(1) In the present embodiment, the core metal 21 is arranged on the inner peripheral side of the plurality of divided cores 11 arranged in an annular shape, and the cylindrical pressurizing jig 31 is arranged on the outer peripheral side. By applying a pressing force inward in the radial direction to each divided core 11, the divided cores 11 adjacent to each other in the circumferential direction are pressed together, and the divided cores 11 and the pressing jig 31 are pressed in the radial direction. . Next, the core metal 21 is removed from the split core 11 while the annular split cores 11 are held in the pressure jig 31, and then the annular split cores held in the pressurization jig 31 are removed. Cogging torque is measured using a test pseudo motor 50 including a core 11 and a reference rotor 41 rotatably provided on the inner peripheral side of the divided core 11. For this reason, in the manufacture of the inspection pseudo motor 50, the step of fixing adjacent divided cores 11 by, for example, welding, the step of attaching the bobbin 14 or the coil 16 to each divided core 11, and the attachment of the coil 16 Thus, it is possible to omit the step of electrical connection of the coil wire (connection end portion 16a), which is necessary accompanying this. Thereby, in this embodiment, compared with the case where it inspects using the finished product of the brushless motor 1, the time required for the inspection of the cogging torque can be shortened and the productivity of the brushless motor 1 can be improved. Further, if the pressure applied by the pressurizing jig 31 is equal to the pressure received by the split core 11 from the motor case 2 in the finished product of the brushless motor 1, the inspection accuracy in the inspection pseudo motor 50 is increased. The cogging torque inspection accuracy using can be made approximately equivalent to the inspection accuracy.

(2) In this embodiment, since the pressurization jig 31 is configured to be able to expand and contract, it is possible to suitably apply a pressing force inward in the radial direction to the annularly arranged divided core 11. .
(3) In this embodiment, since the cored bar 21 is configured to be expandable / reducible, the cored bar 21 is reduced in diameter when the cored bar 21 is removed from the annularly arranged divided core 11, thereby reducing the cored bar 21. Can be easily pulled out.

  (4) In the present embodiment, the reference rotor 41 can be used for the finished brushless motor 1. Thereby, since the brushless motor 1 can be commercialized using the reference | standard rotor 41 of the pseudo motor 50 for a test | inspection, the increase in cost can be suppressed.

In addition, you may change embodiment of this invention as follows.
-In above-mentioned embodiment, although the division | segmentation core arrangement | positioning part 25 of the metal core 21 was comprised so that expansion / contraction was possible, it is not specifically limited to this, It is good also as non-expansion / contraction.

  The shape and the like of the cogging torque inspection device (core metal 21 and pressurizing jig 31) in the above embodiment may be appropriately changed according to the configuration.

  DESCRIPTION OF SYMBOLS 1 ... Brushless motor, 2 ... Motor case, 3 ... Stator, 10 ... Stator core, 11 ... Divided core, 21 ... Core metal, 31 ... Pressure jig, 41 ... Reference | standard rotor, 50 ... Inspection pseudo motor.

Claims (6)

An arrangement step of arranging a metal core on the inner peripheral side of a plurality of divided cores arranged in an annular shape and a cylindrical pressure jig on the outer peripheral side,
After the placement step, the pressing jig applies a pressing force radially inward to the divided cores so that the divided cores adjacent to each other in the circumferential direction are pressure-bonded, and the divided cores and the A core crimping step for crimping the pressing jig in the radial direction;
After the core bonding step, the core segments of the annular removing the core bar from the split core remains in a state of being retained in the pressurizing jig, then pressurizing held within the pressing jig Measuring step of measuring cogging torque using a pseudo motor for inspection comprising each annular divided core in a state where pressure is applied from a jig , and a reference rotor rotatably provided on the inner peripheral side of the divided core And a cogging torque inspection method. The cogging torque inspection method according to claim 1,
The cogging torque inspection method, wherein the pressurizing jig is configured to be able to expand and contract. In the inspection method of the cogging torque according to claim 1 or 2,
A method for inspecting a cogging torque, wherein the core bar is configured to be able to expand and contract. In the inspection method of the cogging torque of any one of Claims 1-3,
The cylindrical outer shell member provided in the pressurizing jig is formed in a tapered shape whose inner peripheral surface is reduced in diameter toward the one end side in the axial direction.
After the core crimping step, a positioning portion that protrudes to the inner side of the outer shell member in the end frame is provided in the state where the opening on the other axial end side of the outer shell member is covered by the end frame. A method for inspecting a cogging torque, wherein the end frame is positioned in the axial direction by abutting against the inner peripheral surface of the cogging torque. In the inspection method of the cogging torque according to any one of claims 1 to 4,
The pressurizing jig includes a cylindrical outer shell member and a pressurizing member fitted into the outer shell member, and an inner peripheral surface of the outer shell member and an outer peripheral surface of the pressurizing member are It is formed in a tapered shape that decreases in diameter toward the one end side in the axial direction of the pressure jig,
In the core crimping step, pressing the pressure member fitted in the outer shell member toward the one end side in the axial direction gives a pressing force radially inward to the divided cores. A characteristic method for inspecting cogging torque. Comprising a cored bar arranged on the inner peripheral side of a plurality of split cores arranged in a ring, and a cylindrical pressure jig arranged on the outer peripheral side of the split cores,
By applying a pressing force inward in the radial direction to each divided core by the pressure jig, the divided cores adjacent in the circumferential direction are pressure-bonded to each other, and each divided core and the pressure jig are Are crimped in the radial direction,
The core metal is removed from the split core while the annular split cores are held in the pressure jig, and then the pressure is applied to the pressure jig held in the pressure jig. An inspection pseudo motor is constituted by each of the annular divided cores in a state of being in a state and a reference rotor rotatably provided on the inner peripheral side of the division core, and cogging torque is measured using the inspection pseudo motor. Cogging torque inspection device.

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