PMVSD®

The Permanent Magnet Motor and the special Variable Speed Drive (PMVSD®) are the core components of the MPS PM system. To attain the maximum efficiency while operating a PMM, the surface control logic in the PMVSD® will always be tracking the actual position of the rotor in the downhole motor to ensure that the stator magnetic field controlled by the PMVSD® is at 90° with respect to the rotor magnetic flux generated by the permanent magnets. MPS is applying a proprietary control technique to always maximize motor efficiency and generated torque at various operating conditions.

Salient Features

High performance permanent magnet motor sensor-less control technology

Integrated controlled sine filter for reliability in long cable applications

Integrated acquisition of drive/motor/pump operation, downhole gauge and surface process data

  • Virtually unlimited internal data logging
  • Retrievable memory card and wireless data transfer
  • Remote control and monitoring options

Oilfield-specific process control applications like intake pressure, dewatering and low-influx.

Comprehensive alarm and automatic restart options

Easy to use full colour touchscreen with large clear display of 10 parameters at a time, easy navigation, touch-to-change units, security levels, graphical displays and comprehensive history reporting

NEMA 3R / 4 enclosures for worldwide use

IO terminals and air filter element accessible during operation

Latest generation power electronics and gate array computing technology

Motor Control

Sensor-less control of new-technology permanent magnet motors

For PM-PCP® direct-drive motors

  • Backspin control
  • Low speed, < 100rpm

Scalar control of induction motors

Universal drive

Brings advanced features to conventional ESPs

Conventional ESP drives output a variable voltage at constant volts/Hz ratio and the motor controls itself as if operating off a variable utility supply. This scalar control is very simple and sufficient for induction motors used in these applications. It is possible nevertheless to over-amp the motor at start-up, just as it is when using switchboards.

MPS permanent magnet motor technology requires closed-loop control, the result of many years of application-specific research and development. These motors are synchronous, that is the applied voltage and current must be in a stable phase relationship with the rotor position. In common industrial applications like robotics, shaft sensors are used to assist the drive. With submersible motors these sensors are not feasible.

MPS drives use sensor-less control: the drive output voltage and current are measured thousands of times per second and at each point an accurate electrical model of the motor and installation back to the drive is used to adjust the output so as to maintain the rotor in synchronism. The result is stable operation with fluctuating loads, control of torque throughout the speed range – there is no danger of a snapped shaft – and in PM-PCP® applications a remarkable ability to operate below 100rpm.

Operation

MPS drives are easy to set-up and operate

Select the installation type PM-ESP®, PM-PCP® or IM-ESP

Select the application type Speed, Pressure, Level, Optimised Intermittent Lift (OiL®) or Dewatering. Anything not relevant to these one-time selections disappears.

Enter the pre-start parameters from readily available nameplate or catalogue information; check the pre-calculated alarm settings and gauge readings

HMI

The large screen displays everything needed for routine monitoring. Touch to change the main page to list power details, gauge details and so on. Touch the Home key and a smaller display pops up for you to quickly navigate for further information.

Touch-key navigation and no numeric codes to remember or look up brings the user interface into the modern age. Touch ft to change to metres, touch ft/day for level control and change to psi/week.

Your settings are saved automatically and can be restored at any time or reverted to the settings your serviceman prepared for you. You can take the settings away on an SD card or safe keeping and apply them to another drive.

The drive logs everything all the time, and you can pop-in an SD card in the door to fetch missing files or leave it in to stay current until you are ready to collect it. Files are unique to the drive, so just use the same card for several jobs on one collection round. Drives internally record a minimum of 12 month’s data.

When no one is at the door, the display switches to monitor mode. Log-in to make changes at your privilege level.If the drive detects something you should know about, the top left status alternates with an indication – information, warning or fault; touch and up pops a list of all issues with suggestions for further action. An event viewer allows you to browse back for any significant events, like stops, starts, faults and parameter changes.

Applications

In the drive’s process applications, production is controlled using some function of process measurements like pump intake pressure to smoothly regulate motor speed. It is possible at any time to override the regulator by touching to turn to Speed control mode and touching again to revert to regulation. Mode change is bumpless – nothing sudden will happen. For example, if you temporarily go to Speed mode and do nothing, the Speed will hold at its last regulated point. Or you can change speed and later the process regulator will smoothly restore the correct speed. This is useful to temporarily observe inflow behaviour or rapidly adjust casing fluid level.



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