Abstract: A novel method for forming a positive electrode active material is provided. The method for forming a positive electrode active material includes causing a reaction between a cobalt aqueous solution and an alkaline aqueous solution to form a cobalt compound; mixing the cobalt compound and a lithium compound and performing a first heat treatment to form a first composite oxide; mixing the first composite oxide and a compound containing a first additive element and performing a second heat treatment to form a second composite oxide; and mixing the second composite oxide and a compound containing a second additive element and performing a third heat treatment. The first heat treatment is performed at a temperature higher than or equal to 700° C. and lower than or equal to 1100° C. The second heat treatment is performed at a temperature higher than or equal to 700° C. and lower than or equal to 1000° C.

Abstract: A stator includes a stator core and a coil wound around the stator core. The coil includes a basic coil segment including a pair of first legs and a first transition portion disposed on a first end surface side of the stator core, and a transition coil segment including a pair of second legs and a second transition portion. The second transition portion includes a pair of shoulders and a pair of second rising portions. An inclination angle of the second rising portion is larger than an angle of the shoulder with respect to a first end surface, so that the second transition portion is in contact with the first transition portion.

Abstract: A stator includes a stator core including a plurality of teeth and a plurality of slots, a coil wound around the plurality of slots, and a spacer disposed on an end portion in an axial direction of the stator core. The coil includes a plurality of coil segments, each including a bent portion and a pair of legs. The spacer includes a coil support portion that is disposed between an end portion of each of the teeth and the bent portion of the coil segment and that has a support surface. A distance from the end portion of each of the teeth to the support surface on an inner side in a radial direction of the stator core is longer than a distance from the end portion of each of the teeth to the support surface on an outer side in the radial direction of the stator core.

Abstract: A stator includes a stator core (6); and a coil wound around the stator core. The coil includes a basic coil segment (22) including a pair of first legs (31) and a first transition portion (32) disposed on a first end surface (14) side of the stator core, and a transition coil segment (23) including a pair of second legs (41) and a second transition portion (42). The second transition portion includes a pair of shoulders (43) and a pair of second rising portions (44). An inclination angle of the second rising portion is larger than an angle of the shoulder with respect to a first end surface, so that the second transition portion is in contact with the first transition portion.

Abstract: A stator includes a stator core (6) including a plurality of teeth (11) and a plurality of slots (12); a coil wound around the plurality of slots; and a spacer (8) disposed on an end portion (14) in an axial direction of the stator core. The coil includes a plurality of coil segments (22), each including a bent portion (31) and a pair of legs (32). The spacer includes a coil support portion (41) that is disposed between an end portion of each of the teeth and the bent portion of the coil segment and that has a support surface (42). A distance from the end portion of each of the teeth to the support surface on an inner side in a radial direction of the stator core is longer than a distance from the end portion of each of the teeth to the support surface on an outer side in the radial direction of the stator core.