Feature: 1. Permanent magnet motor rotor, no excitationloss, rated efficiency above 91%. 2. Three-phase BLDC control method can accurately control the PMBL motor speed and torque, toensure the safe operation of pump shaft and motor. 3. Brake adopts electric control. The control box is equipped with power resistor and independent braking controller. When there is an outage (or system losing electricity), pumping rod can be quickly released to drag the motor reversal and connect braking resistor. It is a restraining control mode. The bigger acceleration of pumping rod reversal, the more energy the resistor absorb, and thatmeans bigger power braking force which eventually make the pumping rod go back to initial state. When screw pump starts next time, the initial starting torqueis small, so it is easy to start again, and there will be no problems with work over operations. This kind of brake is called soft brake. Mainapplication: The new type direct-drive screw pump oil extraction machine issuitable for those oil fields, whose oil is very thick, or contains sand or gas.It has the advantages of saving electricity and saving space. The screw pumpcan be used at the circumstance with a depth less than 1500 meters. It has been successfully adopted by Shengli oil field and exported to |
