Lightweight Hydraulic Low-Speed, High-Torque Motors
Hydraulic motors are devices that convert hydraulic pressure and flow into rotational motion and torque. They are widely used in applications that require high power density, efficiency, and reliability, such as vehicle propulsion, winches, augers, and boom rotate.
There are different types of hydraulic motors, such as gear, vane, piston, and orbital motors. Among them, orbital motors are especially suitable for low-speed, high-torque (LSHT) applications, as they can deliver high output torque throughout their speed range, without the need for additional speed reducers.
Orbital motors are also known as gerotor or geroler motors, depending on the design of their internal gear set. A gerotor motor has a toothed inner rotor that meshes with a toothless outer stator, while a geroler motor has a roller-bearing inner rotor that rolls along a toothed outer stator. Both designs use a spool valve to distribute the hydraulic fluid to the chambers formed by the rotor and stator, creating pressure differences that cause the rotor to rotate.
One of the advantages of orbital motors is their compact and lightweight design, which makes them easy to install and operate in limited spaces. However, not all orbital motors are equally lightweight. Some factors that affect the weight of an orbital motor are:
- The size and displacement of the motor. Larger motors have higher displacement and torque, but also higher weight.
- The material and construction of the motor. Some motors use aluminum or plastic components to reduce weight, while others use steel or iron for durability and strength.
- The features and accessories of the motor. Some motors have additional features such as integrated brakes, valves, sensors, or shaft seals, which can increase the weight and complexity of the motor.
To help you compare and choose the best orbital motor for your application, we have compiled a table of some of the most popular and lightweight hydraulic LSHT motors available in the market, along with their specifications and features.
| Model | Manufacturer | Displacement | Max. Torque | Max. Pressure | Max. Speed | Weight | Features |
|---|---|---|---|---|---|---|---|
| FM4 | FluiDyne Fluid Power | 80 – 500 cc/rev | 1,575 – 6,363 lbf-in | 2,538 – 1,730 psi | 850 – 144 rpm | 6.6 – 18.7 lbs | Gerotor design, high efficiency, 18-month warranty |
| TG | Parker Hannifin | 141 – 959 cc/rev | 4,692 – 11,227 lbf-in | 1,500 – 4,000 psi | 118 – 660 rpm | 9.5 – 25.5 lbs | Geroler design, high durability, high pressure shaft seal |
| OMS | Danfoss | 80 – 475 cc/rev | 1,770 – 6,950 lbf-in | 2,610 – 1,740 psi | 800 – 195 rpm | 8.8 – 19.8 lbs | Geroler design, smooth operation, integrated valve options |
| 2000 | Eaton | 80 – 400 cc/rev | 1,770 – 5,650 lbf-in | 2,900 – 2,000 psi | 945 – 300 rpm | 9.9 – 17.6 lbs | Gerotor design, low noise, high side load capacity |
As you can see, there are many options for lightweight hydraulic LSHT motors, each with its own advantages and disadvantages. Depending on your application requirements, you may prefer a motor that has higher torque, lower speed, higher efficiency, lower noise, or other features. You should also consider the compatibility, availability, and cost of the motor before making your final decision.
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