| Parameter | IAM H3 Series | IAM H7 Series | IAM H8 Series |
| Motor Type | Radial piston hydraulic motor | Radial piston hydraulic motor | Radial piston hydraulic motor |
| Displacement range | 349 – 791 cc/rev | 3907 – 5384 cc/rev | 5966 – 8062 cc/rev |
| Specific torque | 5.6 – 12.6 Nm/bar | 62.2 – 85.7 Nm/bar | 95.0 – 128.3 Nm/bar |
| Number of pistons | 5 | 7 | 10 |
| Max continuous pressure | 250 bar | 250 bar | 180 – 250 bar* |
| Max intermittent pressure | 300 bar | 300 bar | 220 – 290 bar* |
| Peak pressure | 350 bar | 350 bar | 270 – 320 bar* |
| Max continuous speed | 400 – 630 rpm | 130 – 160 rpm | 80 – 120 rpm |
| Peak speed | up to 700 rpm | up to 200 rpm | up to 140 rpm |
| Minimum stable speed | 1 rpm | 0.5 rpm | 0.5 rpm |
| Max continuous power | 45 kW | 130 kW | 130 – 135 kW |
| Max peak power | 68 kW | 180 kW | 180 – 190 kW |
| Max back pressure | 70 bar | 70 bar | 70 bar |
| Max case pressure | 6 bar | 6 bar | 6 bar |
| Flushing flow | 8 – 10 L/min | 20 L/min | 20 L/min |
| Operating temperature | −30°C to +70°C | −30°C to +70°C | −30°C to +70°C |
| Dry weight (approx.) | 68 kg | 405 kg | 590 kg |
| Typical applications | Slewing, winches, industrial drives | Mining, cranes, heavy winches | Large rotary drives, marine, mining |
Key Features of IAM Radial Piston Hydraulic Motors
1. True Low-Speed, High-Torque Performance
IAM radial piston motors are specifically designed for extremely low-speed and high-torque applications.
They can operate smoothly at 1 rpm or even down to 0.5 rpm, delivering stable torque without cogging or crawling.
2. High Torque Density
Thanks to the radial piston architecture, IAM motors provide exceptionally high specific torque (Nm/bar) compared to orbital or axial piston motors.
This allows higher output torque with lower system pressure and more compact system design.
3. Excellent Smoothness and Anti-Creeping Capability
The multi-piston layout ensures continuous torque overlap, resulting in minimal torque ripple and vibration.
Even under heavy loads and ultra-low speeds, the motor maintains smooth, controlled rotation.
4. Heavy-Duty Pressure Capability
IAM motors are engineered for demanding operating conditions:
This makes them ideal for applications with frequent starts, stops, reversals, and impact loads.
5. Designed for Direct Drive Applications
With high torque output at low speed, IAM motors are perfectly suited for gearbox-free direct-drive systems, reducing mechanical complexity, maintenance requirements, and energy losses.
6. Integrated Flushing for Thermal Control
Dedicated flushing ports ensure effective internal cooling and oil renewal, helping to:
Reduce operating temperature
Extend bearing and piston life
Improve long-term reliability under continuous duty
7. Robust Industrial Construction
IAM radial piston motors feature:
They are built to perform reliably in harsh industrial, mining, and marine environments.
8. Wide Range of Sizes and Configurations
The IAM series covers a broad displacement range and offers:
This flexibility simplifies integration into new designs or replacement projects.
9. Suitable for Extreme Working Environments
IAM motors operate reliably in a wide temperature range and can withstand high back pressure and case pressure, making them suitable for outdoor, offshore, and heavy-industry applications.
Typical Applications of IAM Radial Piston Hydraulic Motors
IAM radial piston hydraulic motors are designed for low-speed, high-torque, and heavy-duty operating conditions.
They are widely used in applications where smooth motion, high load capacity, and long-term reliability are critical.
1. Slewing and Rotation Systems
IAM motors are commonly used in slewing drives requiring precise and stable rotation under heavy loads, including:
Their excellent anti-creeping performance ensures smooth rotation even at extremely low speeds.
2. Winches, Hoists, and Lifting Equipment
Thanks to their high torque output and shock resistance, IAM motors are ideal for:
They provide reliable torque during starting, stopping, and load holding operations.
3. Mining and Heavy-Duty Equipment
IAM radial piston motors are widely applied in mining and heavy industry, such as:
The robust design allows continuous operation under high loads and harsh environmental conditions.
4. Marine and Offshore Equipment
In marine and offshore applications, IAM motors are used for:
Their resistance to shock loads, high back pressure capability, and stable low-speed operation make them well suited for marine environments.
5. Industrial Direct-Drive Systems
IAM motors are frequently selected for gearbox-free direct-drive applications, including:
Direct drive reduces mechanical complexity, improves efficiency, and lowers maintenance costs.
6. Mobile and Special-Purpose Machinery
IAM motors are also used in specialized mobile equipment such as:
Tracked vehicles and heavy mobile machinery
Special-purpose construction equipment
Custom OEM hydraulic systems
Their flexibility in configuration simplifies integration into diverse machine designs.
