ORBITAL HYDRAULIC MOTORS
EPMS, EPMSS, EPM, EPMSU, EPRM, EPMT orbital hydraulic motors | FP Trasmissioni
Guide to Orbital Hydraulic Motors: Analysis of EPM, EPMS, and EPMT Models
In the fluid power sector, selecting the correct orbital hydraulic motors is fundamental to ensuring consistent performance and longevity for machinery. Our stock range covers the most common and extreme needs, with a displacement scale ranging from 50 to 400 cm³/rev.
To support the work of designers and maintenance technicians, we have integrated an interactive 3D viewer into our catalog: you can directly view each model, rotate it, and analyze its dimensions in real-time without having to download external files.
The Principle of Orbital Technology in Orbital Hydraulic Motors
These orbital hydraulic motors utilize the Gerotor or Geroler design, where an internal rotor moves with orbital motion within an outer ring. This configuration allows for high starting torque and smooth rotation even at low speeds. The difference between the various models we handle lies primarily in the distribution system (spool valve or disc valve) and the mechanical load capacity.
Analysis of Orbital Hydraulic Motor Models in Stock
EPM / EPRM Model: Efficiency and Compactness
Within the orbital hydraulic motors family, the EPM model represents the standard solution for medium loads. Fluid distribution occurs via the output shaft (spool valve). It is an extremely compact motor, ideal for those with limited space. The EPRM model is the technological evolution with roller lobes (Geroler), which minimize friction and improve mechanical efficiency, making it suitable for heavier and continuous work cycles.
Sectors: Agriculture, light conveyor belts, small mobile utilities.
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EPMS Model: Precision with Disc Valve
The EPMS model represents a step up in construction quality by utilizing a disc valve separate from the output shaft. This system allows for the management of higher operating pressures and ensures that volumetric efficiency does not drop drastically with wear. Within this family, we find specific structural variants:
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EPMSS: The “Short” model, without its own bearings, designed to be coupled directly to gearboxes or mechanical supports that complete its housing.
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EPMSU: The “Ultra-short” version, dedicated to custom integrations where every millimeter of axial length is critical.
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Sectors: Professional agricultural machinery, recycling plants, medium-sized winches.
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EPMT Model: The Maximum Power
For applications requiring powerful torque and the ability to withstand massive radial loads, the EPMT model is the reference standard. With displacements reaching up to 400, this motor is equipped with tapered roller bearings that allow it to operate under extreme mechanical stress conditions.
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Sectors: Drilling rigs, large marine winches, drive wheels for heavy construction machinery.
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Interactive 3D Visualization: Design in Real Time
One of the competitive advantages of our service is the ability to view 3D models directly on our website. It is no longer necessary to wait for technical data sheets via email or download heavy CAD files.
Thanks to the integrated viewer, for each model you will be able to:
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Analyze Flanges: Visually verify if the flange (2 or 4 holes) fits your mounting support.
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Inspect Shafts: View the shaft type (cylindrical with keyway, splined, or tapered) and its actual dimensions.
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Map Connections: See the exact position of ports A and B and the drain port, which is fundamental for routing hydraulic hoses in tight spaces.
This functionality reduces ordering errors to zero, allowing you to instantly compare the spare part you have in hand with the model displayed on the screen.
Guide to Selecting Displacement (50 – 400)
The displacement (expressed in cm³/rev) determines the motor’s behavior within the circuit:
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Range 50 – 100: High-speed motors, ideal for drives requiring high RPM but moderate torque.
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Range 125 – 250: The most common choice for general hydraulic transmissions, offering an excellent balance of force and speed.
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Range 315 – 400: High-force motors. Ideal for those needing to move heavy loads from a standstill, accepting lower rotation speeds.
Technical Tip: Always remember to check the maximum allowable pressure on the shaft seal. If your system involves high backpressure on the return line, the use of an external drain is mandatory to prevent leaks or failures.