BMER Orbital Motor

What Is the BMER Orbital Motor?

The BMER series refers to a line of Geroler orbital hydraulic motors (also known as gerotor or roller gear motors), designed with a high-speed distribution flow and engineered for high-pressure, low-speed, high-torque applications

.

Specifically, the BMER-2 models employ a Geroler (roller gear) gear set, featuring a pressure-compensated balance plate structure that enhances volumetric efficiency at low flows and high pressures

. These motors also use tapered roller bearings on the output shaft for improved axial and radial load handling

.

Key Specifications:
Displacement

Range from 7.2 to 45.5 in³/rev (approximately 118 to 745 cm³/rev)
Anfield Industries Inc.

.

Torque and Speed

Continuous torque ranges between 239.7 and 774.4 lbf·ft (~325 to 1050 N·m).

Operating speeds vary, with a continuous range of 100–360 rpm, and intermittent or peak speeds higher, depending on model

.

Efficiency & Design Highlights

The roller gear set paired with a balance plate ensures smooth startup and maintains efficiency under varying pressure conditions

.

Heavy-duty, oil-lubricated drive links extend longevity


The shaft seal is high-pressure rated, eliminating need for case drain and improving durability


BMER Models & Applications

Available in multiple configurations—BMER-2, BMER-3, and BMER-4—each offers varied displacement, mounting, and shaft options, suitable for numerous applications including agriculture, construction, material handling, forestry, lifts, augers, and winches

.

For example, a catalog lists detailed specs for the BMER-750 variant:

Displacement: 745 cm³/rev

Continuous torque: up to ~1050 N·m

Max operating pressure: about 20.5 MPa (peak 27.6 MPa)

Continuous flow: up to 75 L/min

.

Performance Overview:
Feature Specification
Displacement 7.2–45.5 in³/rev (118–745 cm³/rev)
Continuous Torque 239.7–774.4 lbf·ft (~325–1050 N·m)
Continuous Speed 100–360 rpm
Peak Pressure (Max) Up to ~27.6 MPa
Flow (Max) Around 75 L/min
Notable Features High-pressure shaft seal, efficient startup balance, robust bearings
Summary

The BMER orbital motors offer a compelling blend of high torque, smooth low-speed operation, and long service life, thanks to their advanced Geroler design, pressure-compensated balance plate, and robust bearing and seal architecture.

If you'd like help selecting a specific model, identifying comparable OEM replacements (like Danfoss, White, Parker), or need sizing details for your project, feel free to let me know—happy to assist!