Electric annular with internal motor

A blowout preventer, comprising:

• a housing having an axial passage for flowing well fluid through the well valve assembly;
• a component disposed within the housing around the axial passage, the component having a circular circumference and an outer wall with a circumferential thread on the outer wall of the component;
• a gate assembly disposed within the housing and configured to open and close with axial movement of the component;
• a rotor disposed within the housing and having a structure for applying axial force to the component when the rotor rotates;
• a stator disposed within the housing and coupled to the rotor to rotate the rotor upon application of electric power;
• an advancing screw structure disposed between the rotor and the component to transmit axial force between the rotor and the component;
• and
• a power conduit coupled to the stator to apply electric power to rotate the rotor.

A blowout preventer, comprising:

• a housing having an axial passage for flowing well fluid through the well valve assembly and an inner wall and an outer wall defining an annular receptacle around the axial passage within the housing;
• a component disposed within the annular receptacle, the component having a circular circumference and an outer wall with a circumferential thread on the outer wall of the component;
• a gate assembly disposed within the annular receptacle and configured to open and close with axial movement of the component;
• a rotor disposed within the annular receptacle and having a structure for applying axial force to the component when the rotor rotates;
• and
• a stator disposed within the annular receptacle and coupled to the rotor to rotate the rotor upon application of electric power.