Rendering courtesy of Statoil
Motor image courtesy of Interwell EST


Controllable Drive Actuators

For Downhole & Off Shore Equipment

Significant advantages have been realized in the field of oil exploration and other related industries by utilizing state of the art electromechanical components, rather than hydraulics, for advanced Downhole tools. High reliability and compact design make CDA's rotary and linear controllable drive actuators ideal for these demanding applications.

The unparalleled performance at minimum diameter and volume of our standard modular components make our rotary and linear actuators ideal for high reliability tool applications which are exposed to hostile Downhole environments. CDA's polymide based insulation system, and high grade stainless steel construction motors, gearboxes, and rotary transducers, provide ideal controllable drive actuator solutions for rotary and linear systems used in Downhole high temperature and pressure environment applications. Standard design features include class H225 insulation system, matched coefficient of expansion materials, and high strength gearing. The typical operational environment for our Downhole applications include +225° C ambient temperature, at 30,000 psi of pressure. Higher operating temperatures and pressures are available on request.

Our entire product line is based on rugged modular design concepts. At the heart of our actuators are high performance, high capacity motors. We may configure any of our seven frame size motors as Brushless Permanent Magnet Motors, AC Induction Motors, or DC Stepper Motors. Any of these motors may be complimented with our equally durable rate or position transducers. Precision machining of the motor interface to the high strength gearing modules assures reliable, high efficiency performance and operation.

A distinct advantage of CDA's modular product line is the high torque and power output capacity within an extremely small diameter actuator package. This advantage makes our actuators ideal for Downhole applications where diameter space is at a premium.

Custom windings, operational voltages, frequencies, motor drive configurations, and mechanical interface options increase design flexibility for tool design engineers who must work with line losses, space limitations, and limited electronic control options. In addition to the motor types listed above, CDA has developed a winding lay-in configuration which develops sinusoidal currents from square wave voltage sources. This technique allows simple electronic control of AC Induction Motors from DC voltage sources, allowing limited line connections, with inherent brushless motor reliability.

  • Halliburton
  • Weatherford
  • Schlumberger & various subs
  • BP
  • Interwell
  • Baker Hughes
  • ABB
  • COSL
  • Etc.
  • MWD
  • LWD
  • Formation Testing
  • Core Sampling
  • Perforation
  • Rotary Steerable
  • Pressure Testing
  • Plug
  • Electric Setting
  • Packer
  • Tractor
  • Fracking
  • Caliper
  • Laser
  • Electrical Manipulation
  • Cutter
  • Seismic
  • Etc.
  • Pump Motors
  • Weight on Bit Drives
  • Gas Lift Valve Drives
  • Retractable Fail Safe Drives
  • Valve Position Transducers
  • Stage Lock Drives
  • Pulser
  • Generator
  • Optical
  • MicroDrill
  • Valve
  • Circulating
  • Clamp
  • Piston
  • Indexing
  • Shifter
  • Acceleration & Control
  • Etc.
For further information or assistance with your specific requirements please call CDA directly or email us at or use the link below to submit your requirements online.

Long Stack Motors

Since 1970, CDA InterCorp has been the leader in the design and manufacture of highly engineered, extremely reliable, Controllable Drive Actuators for technologically advanced control systems. Continued business growth has required CDA to triple its size since our founding.

CDA InterCorp's Controllable Drive Actuators, Rotary Transducers and Eddy Current Dampers have been used in many high performance critical applications for defense, aviation, space, ground support, Downhole equipment tools and high reliability industrial applications. We now have extended our product offering, literally. Our standard modular frame size motors are offered with higher performance for the same diameter in our Long Stack product.

CDA's standard modular design concept provides unparalleled performance per unit volume. A substantial benefit of our modular design is the multifunction tasking capabilities within a single drive actuator. Every product within our line is an established, qualified module. A new application may derive the benefit of a custom performance and mounting configuration actuator, with "off-the-shelf-technology".

Downhole Generators

Significant advantages can be realized by utilizing state of the art generators, rather than expensive batteries or hundreds of meters of tether line, to supply power for your Downhole application needs. High reliability in harsh environments, compact design, and a prolonged lifetime of power generation make CDA's generators ideal for the Downhole environment.

The unparalleled performance at minimum diameter and volume of our generators make them a geometrically advantageous solution to integrate within wellbore tools. Depending upon the power requirements of the application, CDA's generator frame sizes range from 1/2" to 3" OD, and therefore are an ideal fit within even the smallest diameter tools. The only input necessary for the generation of electrical power is the abundant supply of mechanical energy present in Downhole drilling applications. Electrical power is generated by tapping into the torque created via the rotating drill string, or by utilizing the high pressure drilling fluids/mud which can turn the generators turbine as it flows. The generated power can then be used to power electronic systems, sensors, and motors. The power generated comes without worrying about depleting your power source, such as with finite life/temperature battery packs.

Besides the inherent advantages of Downhole generators when compared to limited life power sources, CDA's durable design and construction makes it a component whose lifetime and reliability excel even in the most extreme Downhole environments. Standard design features include a high temperature and chemically resistant polyimide based class H225 winding insulation system, mil-spec lead wires, and matched coefficient of expansion materials. Also standard to all designs is the use of high grade stainless steel materials, and the use of the same design methodologies and manufacturing processes which are not only employed in our Downhole applications, but also have decades of use in the 2 other industries that CDA serves, the military and space industries. As a result, the typical operational environment for our Downhole applications include +225° C ambient temperature, at 30,000 psi of pressure. Higher operating temperatures and pressures are available on request.

Downhole Hall Effect Sensor

CDA's first choice for motor commutation in a harsh High Temperature High Pressure (HTHP) Downhole environment is our Field Director. A Field Director is a compact reluctance resolver with sine & cosine output and is ideal for efficient commutation. More information about these sensors can be found in our online catalog. For customers who require digital commutation for HTHP (High Temperature High Pressure) Downhole tool applications CDA also offers a Hall Effect Device (HED) that is compatible with this environment.

CDA's HED is integrated onto the motor without impact to performance (eg. No additional bearings). The modular containment of the HED sensor assembly keeps it mechanically and thermally isolated from the motor windings. CDA's HED design includes additional structural rigidity to fortify the sensors against the high shock, vibration, temperature, and pressure extremes encountered Downhole. Each sensor is screened for the application requirements and, as an assembly, CDA's HED is currently rated for a maximum of 200°C and 20kpsi and has also been qualified for space flight vibration levels in excess of 40Grms, and shock impacts above 100G. CDA's HED module sizes of 0.750" OD and 1.250" are compatible with all of our standard motor sizes.

Should your application requirements exceed the listed ratings of the CDA HED we invite you to have us review them anyway. Our test capabilities are quite extensive and we'd be glad to work with you to establish a qualification program for your unique requirements.

Please contact us with any questions or if we can be of any additional assistance.

Motor/Actuator Application Data