The eddy current loss in the flat wire winding lead to low efficiency and high temperature rise in the motor

increasing the risk of insulation aging in the motor. The key to suppressing the eddy current loss in the flat wire winding is the optimization design of the winding structure. The existing winding structure for suppressing the eddy current loss of the flat wire winding face issues such as low copper slot fill factor and high circulating current loss. Therefore

a new parallel helix winding(PHW)was proposed. The parallel split structure can effectively reduce the eddy current loss of the winding. Its helix structure can effectively reduce the circulating current loss

and also has a high copper slot fill factor. A 60 kW permanent magnet synchronous motor(PMSM)was taken as an example. Firstly

the structure of the new PHW and its loss reduction principle were introduced. Then

the AC loss of flat wire winding

split flat wire winding

and new PHW were compared by the 3-D finite element method. Finally

the effectiveness of the loss reduction effect of the new PHW was verified by the comparison experiment between the flat wire winding

the split flat wire winding and new PHW. The research shows that compared with the flat wire winding

the AC loss of the new parallel helix winding is reduced by 17.3% under the rated condition

and the AC loss is reduced by 47% under the high frequency condition.