Permanent magnet direct drive type linear motor

The utility model relates to a permanent magnet direct drive type linear motor, which comprises a motor primary and a motor secondary, wherein the motor primary comprises a primary iron core (1), armature windings (2), a primary pole piece (3) and permanent magnets (4), the primary iron core (1) is provided with a slot, the armature windings (2) are embedded into the slot of the primary iron core (1), and the permanent magnets (4) are arranged at the surface of the primary pole piece (3); the motor secondary comprises a secondary iron core (6) and secondary salient poles (7); an air gap (5) is arranged between the motor primary and the motor secondary; the motor primary is fixed, and the motor secondary does linear motion along the motion direction of the motor; and the motor is of a unilateral plate-type structure, a bilateral plate-type structure and a cylinder structure. By utilizing the special structure of the motor, the distribution of air gap reluctances of the motor can be modulated, when the motor is moved, the motion speed of permanent magnet flux in the motor primary is doubled than that of the motor secondary, and thus the effect of speed raising is realized. The motor is applicable for the application occasion in low-speed direct drive, and has the characteristics that the power density is high, normal rated thrust is high, and the like.