Detection coil device for motor turn-to-turn short circuit fault detection

The invention belongs to the technical field of motor fault detection, and discloses a detection coil device for motor turn-to-turn short circuit fault detection, which comprises N groups of detection coils, each group of detection coils comprises M detection coils, the electrical angle difference of the adjacent detection coils is 180 degrees, every two of the M detection coils are used as one subgroup in sequence, and the M detection coils are used as one subgroup; the two detection coils in each sub-group are reversely connected in series, and the sub-groups are positively connected in series; wherein M = J/N, J is the number of poles of the motor, N is the redundancy of the motor, and N is greater than or equal to 2; the detection coils in each group are sequentially arranged in the motor grooves of the corresponding redundancy and are wound on the stator yoke part of the motor; each detection coil is used for sensing the magnetic flux change of the slot where the detection coil is located and the adjacen