Semi-Direct Drive
Motor sheaves and belts are eliminated, which leads to a higher system efficiency and lower system maintenance costs.
Prime mover
Permanent Magnet Motor
A low-speed, high-torque permanent magnet motor that drives the gear reducer directly. No sheaves, no belts, and a far more efficient pumping unit.
93%+system efficiency
0belts or sheaves
Steplessspeed control
3D view needs WebGL.
Design features
Energy Saving
In addition to enhanced transmission efficiency by eliminating motor sheaves and belts, the motor efficiency is also improved compared to conventional asynchronous motors.
System Reliability and Minimal Maintenance
Other than efficiency, the motor reliability is also greatly improved.
Space Saver
Compared to conventional motors, our permanent magnetic motors are much more compact in design and eliminate the need of using a motor bracket for pumping unit applications.
Stepless Speed Change
ULT smart control allows the motor speed to be adjusted indefinitely up to the maximal speed.
Green Technology
Extremely low noise and low vibration design makes ULT permanent magnetic motors very environmentally friendly.
On site
Permanent magnet motor technical details
Technical specification
ULT permanent magnetic synchronous variable frequency motor is a low-speed high torque motor specially designed for oilfield pumping units. The traditional belt driven system is eliminated; and the ultra-thin body is used to directly drive the reducer, which is efficient, energy-saving, safe, and reliable.
Conventional (high efficiency) asynchronous motor efficiency is 92%; and the sheave-belt transmission efficiency ranges from 78% to 84%. The total efficiency of a beam pumping unit with an asynchronous motor being the prime mover ranges from 72% to 77%.
ULT permanent magnetic motor efficiency is no less than 93%; and the sheave-belt transmission is no longer required. The total efficiency of a beam pumping unit with an ULT permanent magnetic motor being the prime mover is 93% or higher.
Permanent magnet motor FAQ
How efficient is a permanent magnet motor on a pumping unit?
A beam pumping unit driven by a ULT permanent magnet motor reaches 93% or higher total efficiency. With a high-efficiency asynchronous motor (92%) and a sheave-belt drive (78 to 84%), total efficiency is typically 72 to 77%.
How does the motor connect to the pumping unit?
The thin-body motor drives the gear reducer directly. Motor sheaves, belts and the motor bracket are no longer needed, which saves space and removes the parts that wear most.
How is pumping speed adjusted?
ULT smart control varies motor speed steplessly up to its maximum speed, so the stroke rate can be matched to the well. For pump-off control, see the VFD rod pump controller.
How much maintenance does a PMM need?
Very little. There are no belts or sheaves to service, and unlike conventional motors, maintenance on the motor itself is minimal. It also runs with very low noise and vibration.
Is there a permanent magnet drive for PCP wells?
Yes. The ULT PMM direct-drive head pairs a high-torque permanent magnet motor directly with the PCP wellhead, with no belts, sheaves or gearbox.
