Laminated block correctness determining method

1 . A laminated block correctness determining method for determining whether a laminated block to be laminated is a correct laminated block when manufacturing a laminated iron core by laminating cylindrical laminated blocks, each including laminated iron core pieces, wherein orientation identification portions are respectively disposed on opposite end surfaces of each of the laminated blocks in an axial direction, the orientation identification portions being used to identify an orientation of the laminated block, the laminated block correctness determining method comprising:

acquiring, with an imaging device, a captured image of the laminated block by capturing one end surface of the laminated block in the axial direction; and

determining whether the orientation of the laminated block is correct by comparing the orientation identification portion in a registered image with the orientation identification portion in the captured image, the registered image being an image of one end surface of the correct laminated block in the axial direction registered in advance,

wherein, in a state in which the orientation is determined to be incorrect, a lamination operation of laminating the laminated blocks to form the laminated iron core is stopped, and

wherein, in a state in which the orientation is determined to be correct, the lamination operation of laminating the laminated blocks to form the laminated iron core is continued.

2 . The laminated block correctness determining method according to claim 1 , wherein

each of the laminated blocks includes:

a central hole;

cooling passages which are arranged at intervals in a circumferential direction, which open in the opposite end surfaces, and through which a cooling medium flows; and

a key that protrudes from an inner surface of the central hole,

the cooling passages include:

a first cooling passage located in a predetermined region as the one end surface is viewed; and

a second cooling passage symmetric to the first cooling passage with respect to an imaginary axis extending in a protruding direction of the key, the second cooling passage having an opening shape that is different from an opening shape of the first cooling passage,

the orientation identification portions each include the first cooling passage and the second cooling passage, and

the determining whether the orientation of the laminated block is correct includes determining whether the orientation of the laminated block is correct by comparing the opening shape of the cooling passage located in the predetermined region in the registered image with the opening shape of the cooling passage located in the predetermined region in the captured image.

3 . The laminated block correctness determining method according to claim 1 , wherein

the laminated blocks include a laminated block that has a groove formed on an outer circumferential surface of the laminated block and a laminated block that does not have the groove, and

the laminated block correctness determining method further comprises:

detecting presence or absence of the groove in the laminated block, the detecting presence or absence of the groove including detecting a position of the groove when detecting the groove; and

determining whether a laminating order of the laminated blocks is correct from a detection result of the detecting presence or absence of the groove.

4 . The laminated block correctness determining method according to claim 1 , wherein

the opposite end surfaces of each of the laminated blocks respectively include line identification portions used to identify a production line of the laminated block, and

the laminated block correctness determining method further comprises:

determining whether the production line of the laminated block is correct by comparing the line identification portion in the registered image with the line identification portion in the captured image.

5 . The laminated block correctness determining method according to claim 1 , wherein

the opposite end surfaces of each of the laminated blocks respectively include type identification portions used to identify a type of the laminated block, and

the laminated block correctness determining method further comprises:

determining whether the type of the laminated block is correct by comparing the type identification portion in the registered image with the type identification portion in the captured image.

6 . A laminated block correctness determining method for determining whether a laminated block to be laminated is a correct laminated block when manufacturing a laminated iron core by laminating cylindrical laminated blocks, each including laminated iron core pieces, wherein orientation identification portions are respectively disposed on opposite end surfaces of each of the laminated blocks in an axial direction, the orientation identification portions being used to identify an orientation of the laminated block, the laminated block correctness determining method comprising:

acquiring, with an imaging device, a captured image of the laminated block by capturing one end surface of the laminated block in the axial direction; and

determining whether the orientation of the laminated block is correct by comparing the orientation identification portion in a registered image with the orientation identification portion in the captured image, the registered image being an image of one end surface of the correct laminated block in the axial direction registered in advance, wherein

each of the laminated blocks includes:

a central hole;

cooling passages which are arranged at intervals in a circumferential direction, which open in the opposite end surfaces, and through which a cooling medium flows; and

a key that protrudes from an inner surface of the central hole,

the cooling passages include:

a first cooling passage located in a predetermined region as the one end surface is viewed; and

a second cooling passage symmetric to the first cooling passage with respect to an imaginary axis extending in a protruding direction of the key, the second cooling passage having an opening shape that is different from an opening shape of the first cooling passage,

the orientation identification portions each include the first cooling passage and the second cooling passage, and

the determining whether the orientation of the laminated block is correct includes determining whether the orientation of the laminated block is correct by comparing the opening shape of the cooling passage located in the predetermined region in the registered image with the opening shape of the cooling passage located in the predetermined region in the captured image.