Design method of permanent magnet linear motor and permanent magnet linear motor

The invention discloses a design method of a permanent magnet linear motor and the permanent magnet linear motor, and relates to the field of motors. N motor subunits which meet a preset pole slot selection condition and are arranged in sequence are selected according to a preset motor unit selection strategy; the total number of the stator slots included in the N motor sub-units is equal to the total number of the permanent magnets included in the N motor sub-units, so that the homopolar and same-slot characteristics of the motor are ensured; correcting a first size of an initial rectangular tooth of the motor subunit arranged at the first position and a second size of an end rectangular tooth of the motor subunit arranged at the last position according to the synthetic cogging force and a preset size correction strategy, so that the synthetic edge end force and the synthetic cogging force meet a preset offset condition within a design error allowable range, the phase superposition amplitude cancellation bet