TH38347A - Electric driven - Google Patents

Abstract

DC60 (09/07/42) Electrically actuated actuator (10) for working with valves or actuators with an acting shaft requiring a torque greater than 10 Nm, with a housing (11) and a drive shaft (17) mounted rotatably within the housing (11), with one end protruding from the housing to directly engage the acting shaft of the valve or actuator, and an electric motor capable of generating a closing force greater than 10 Nm mounted axially directly on the drive shaft without any gears in between. Electrically actuated actuator (10) for working with valves or actuators with an acting shaft requiring a torque greater than 10 Nm, with a housing (11) and a drive shaft (17) mounted rotatably within the housing (11), with one end protruding from the housing to directly engage the acting shaft of the valve or actuator, and an electric motor capable of generating a closing force greater than 10 Nm mounted axially directly on the drive shaft without any gears in between.

Claims (13)

1. An electrically actuated actuator for operating a valve or shut-off valve whose actuation shaft requires an operating torque greater than 10 Nm. Such an electrically actuated actuator shall consist of: (i) a housing; (ii) a drive shaft mounted rotatably within the housing and with one end extended from the housing for direct coupling to the actuation shaft of the valve or shut-off valve; (iii) an electric motor capable of generating a closing force greater than 10 Nm, mounted on the drive shaft; and (iv) a means to control the operation of the motor. 2. An actuator as defined in Claim 1, whereby the electric motor is a constant torque electric motor using permanent magnets and has variable speed. 3. An actuator as specified in claim 2, whereby the electric motor shall be a high-torque DC motor operated by pulse width modulation. 4. An actuator as specified in claim 3, whereby the electric motor is adjusted to provide an infinitely variable drive shaft speed over a specified range of speeds. 5. An actuator as specified in claim 3, whereby the electric motor is adjusted to provide constant torque over all specified speed ranges. 6. An actuator as specified in Claim 1, in which an electric motor consisting of a stator fixed to the frame and a rotor mounted on the drive shaft. 7. An actuator as specified in claim 6, where the rotor is mounted rotatably on the drive shaft, and where the actuator is further integrated with the clutch to connect the rotor to the drive shaft. 8. An actuator as specified in claim 7, whereby the clutch shall include a drive sleeve mounted sliding on the drive shaft but not rotatable relative to the drive shaft, and a drive pin on the drive sleeve and a drive pin on the rotor, and a spring mechanism to hold the drive sleeve toward the rotor, thus the drive pins are locked in place. 9. The actuator as specified in claim 8 and which, in conjunction with the cam trajectory, holds the drive sleeve and moves the drive sleeve away from the rotor on the spring trajectory to release the drive pin. 10. An actuator as specified in claim 9, where the other end of the drive shaft is connected to a handwheel used to rotate the drive shaft when the drive pin is released. 11. The actuator as defined in Reputation 1, where the means to control the operation of the electric motor is a motor drive control unit consisting of a motor drive and protection circuit and a human-interactive control unit that sets the operating parameters of the actuator. 12. An actuator as specified in claim 11, whereby the control mechanism shall include a programmable microprocessor in which the operating parameters are set and an alarm is given when those parameters are met. 13. The actuators specified in claim 11, whereby the human-interface control unit provides operating parameters, can be defined at specific points or remotely (Clause 13, page 2, figure 7).