Rotor iron core and electric power assisted steering motor provided with rotor iron core

The utility model provides a rotor iron core and an electric power assisted steering motor provided with the rotor iron core. All the iron core punching sheets (171) of the rotor iron core are sequentially arranged in more than two layers along the axis direction of a central through hole (171a). The magnetic orientations of the iron core punching sheets (171) of the same layer are the same with one another. The included angles formed between the magnetic orientations of every two adjacent layers of the iron core punching sheets (171) are the same. Meanwhile, the included angle formed between the magnetic orientations of two adjacent layers of the iron core punching sheets (171) satisfies the following relationship: img file='DDA0000636782290000011, TIF' wi='230' he='126', wherein L represents the included angle formed between the magnetic orientations of two adjacent layers of the iron core punching sheets; n represents the layer number of the iron core punching sheets (171); N represents the number of the punching teeth (171c) of each iron core punching sheet (171); and eta is a positive integer. According to the technical scheme of the utility model, the electric power assisted steering motor is low in vibration and low in noise during the operation process. The unpleasant driving experience of a driver can be effectively avoided. Meanwhile, the embodiments of the present utility model are low in cost.