Abstract: A rotary electrical machine includes a housing which includes a flow passage portion in which a refrigerant flow passage through which a refrigerant flows is formed and which houses a rotor and a stator. The refrigerant flow passage includes a first flow passage of which a length from the inlet to the outlet in the circumferential direction is a predetermined length, and a second flow passage of which a length from the inlet to the outlet in the circumferential direction is shorter than that of the first flow passage. The second flow passage is provided with a partition wall portion between the inner peripheral wall and the outer peripheral wall in the radial direction. A slit penetrating the partition wall portion in the circumferential direction is formed in the partition wall portion. A width of the slit is smaller than a width of the first flow passage.

Abstract: A rotary electrical machine includes a rotor, a stator, and a housing having a flow passage section. The flow passage section has an inner circumferential wall that makes contact with an outer circumferential surface of the stator, an outer circumferential wall arranged on the outside of the inner circumferential wall in the radial direction, and a partition wall section, which is provided in a portion in the circumferential direction, and connects the inner circumferential wall and the outer circumferential wall in the radial direction. The stator has a yoke section extending in the circumferential direction, and a plurality of teeth extending radially inward from the yoke section. The yoke section has a first portion connected to each of the teeth, and a second portion arranged between two first portions adjacent to each other in the circumferential direction. The partition wall section faces the second portion in the radial direction.