Cylindrical permanent magnet linear motor

The invention discloses a cylindrical permanent magnet linear motor which comprises a motor stator and a motor rotor. The shape of the axial cross section of the motor stator is a closed stator groove so as to achieve sealing of a cavity of the motor stator. The cylindrical permanent magnet linear motor has the advantages that the shape of the axial cross section of the linear motor stator is the closed groove, the structure is simple, and the cylindrical permanent magnet linear motor is particularly suitable for integrated machining production modes adopting the machining means like turning. Compared with a traditional linear motor with an inner protective cylinder, the closed groove-shaped linear motor stator is less in equivalent air gap, and therefore electromagnetic force generated by unit current under the same condition is larger.