Oil-submersible and oil production pump driven by DC step permanent magnet linear electric motor

The utility model relates to a submersible oil production pump driven by a direct-current stepping permanent magnet linear motor, which is composed of a cable (1), a motor stator (2), a motor mover (3), a variable diameter sheath (4), a pump cylinder (5), a plunger (6) and a ball valve set (7). The upper end and the lower end of the cable (1) are respectively connected with a ground control cabinet (8) and a coil in the motor stator (2), the upper end and the lower end of the motor stator (2) are respectively connected with an oil pipe (9) and the variable diameter sheath (4) by threads, the lower end of the variable diameter sheath (4) is connected with the pump cylinder (5) by the threads, the motor stator (2) and the pump cylinder (5) are respectively internally provided with the motor mover (3), the plunger (6) and the ball valve set (7), and the lower end of the motor mover is connected with the upper end of the plunger (6). The oil production pump has novel structure, banishes a ground pumping unit and