Hollow vertical shaft type permanent magnet synchronous drive device for screw pump

The utility model relates to a hollow vertical shaft type permanent magnet synchronous drive device for a screw pump, belonging to a mechanical ground-driving device of oil production in oilfields. The hollow vertical shaft type permanent magnet synchronous drive device for the screw pump is characterized in that a drive motor is a direct driven synchronous motor; an electromotor shaft is a vertical hollow structure, and a polished rod is passed through the electromotor shaft and is fixedly connected with the shaft through a slip and a shaft coupling; when the electromotor rotates, the rotation of the polished rod can be driven synchronously, and at last the rotation of the screw pump under the well is driven to lift the oil, thereby leaving out belt drive and a reducer; an open-loop control is used; a magneto-sensitive position sensor is taken away; oil hole tanks are arranged between the bearing in the electromotor and the casing; and the oils can be changed, cleaned, and added in time, thereby prolonging s