A rotor, wherein the rotor comprises a central core, a plurality of peripheral cores, and a sleeve, wherein the central core comprises an axial hole that penetrates along an axial direction and a plurality of mounting positions distributed along a circumferential direction of the central core; the plurality of peripheral cores and the central core are always accommodated in the sleeve, the plurality of peripheral cores are in one-to-one correspondence with the plurality of mounting positions, each peripheral core is disposed in a corresponding mounting position, each peripheral core is spaced apart from the central core to form a first separation gap, a second separation gap, and a third separation gap that communicate with each other, the first separation gap and the second separation gap form a first included angle less than 180° facing the sleeve and are respectively configured to accommodate a first permanent magnet and a second permanent magnet, the first permanent magnet and the second permanent magnet are disposed on two sides of the third separation gap, and the first permanent magnet and the second permanent magnet are respectively spaced apart from the sleeve to form a first magnetic isolation gap and a second magnetic isolation gap; and each peripheral core is provided with an open slot, the open slot is configured to accommodate a third permanent magnet and a fourth permanent magnet, and the third permanent magnet and the fourth permanent magnet are respectively spaced apart from the sleeve to form a third magnetic isolation gap and a fourth magnetic isolation gap or spaced apart from an end wall of the open slot to form a first magnetic isolation slot or a second magnetic isolation slot; wherein the open slot comprises a first magnetic slot, a third magnetic isolation slot, and a second magnetic slot that communicate with each other, the first magnetic slot and the second magnetic slot form a second included angle less than 180° facing the sleeve and are respectively configured to accommodate the third permanent magnet and the fourth permanent magnet, and the third permanent magnet and the fourth permanent magnet are disposed on two sides of the third magnetic isolation slot; characterized in that the third magnetic isolation slot is parallel to the third separation gap. the central core comprises an axial hole that penetrates along an axial direction and a plurality of mounting positions distributed along a circumferential direction of the central core; the plurality of peripheral cores and the central core are always accommodated in the sleeve, the plurality of peripheral cores are in one-to-one correspondence with the plurality of mounting positions, each peripheral core is disposed in a corresponding mounting position, each peripheral core is spaced apart from the central core to form a first separation gap, a second separation gap, and a third separation gap that communicate with each other, the first separation gap and the second separation gap form a first included angle less than 180° facing the sleeve and are respectively configured to accommodate a first permanent magnet and a second permanent magnet, the first permanent magnet and the second permanent magnet are disposed on two sides of the third separation gap, and the first permanent magnet and the second permanent magnet are respectively spaced apart from the sleeve to form a first magnetic isolation gap and a second magnetic isolation gap; and each peripheral core is provided with an open slot, the open slot is configured to accommodate a third permanent magnet and a fourth permanent magnet, and the third permanent magnet and the fourth permanent magnet are respectively spaced apart from the sleeve to form a third magnetic isolation gap and a fourth magnetic isolation gap or spaced apart from an end wall of the open slot to form a first magnetic isolation slot or a second magnetic isolation slot; wherein the open slot comprises a first magnetic slot, a third magnetic isolation slot, and a second magnetic slot that communicate with each other, the first magnetic slot and the second magnetic slot form a second included angle less than 180° facing the sleeve and are respectively configured to accommodate the third permanent magnet and the fourth permanent magnet, and the third permanent magnet and the fourth permanent magnet are disposed on two sides of the third magnetic isolation slot; characterized in that the third magnetic isolation slot is parallel to the third separation gap.