Stator assembly and motor

The invention discloses a stator assembly and a motor. The stator assembly comprises a stator core and a multi-branch square conductor winding, the inner circumference of the stator core is provided with an even number of stator slots, and each stator slot is divided into a plurality of layers for accommodating square conductors; the multi-branch square conductor winding is arranged in the stator slots, the multi-branch square conductor winding comprises B parallel branches, and B is an integral multiple of 4; and the number Q of slots per pole per phase of the stator assembly is an odd number, and Q and B meet the following relation: (Q + 1) * 2/B and (Q-1) * 2/B. In the stator assembly, through the special winding connection design, no magnetic field phase difference exists between the parallel branches, and each parallel branch equally passes through each layer in the stator slots, so that the magnetic field phase difference between the parallel branches is reduced, the generation of circulating current be