Electric Drive for Boom, Arm and Lift Joints
Put the drive at the pivot instead of a cylinder across it: rated to 6,000 Nm continuous, 10,000 Nm max for shock and peak loads, the same torque both ways, and no pump, tank or hoses.
Evaluation unit A$4,950, credited in full against your first order of 10 or more. About 2 months lead time.
Why it works electric
Same torque through the whole swing
A cylinder's leverage on an arm changes with the angle, so the joint is strong in the middle and weak at the ends. A drive at the pivot gives the same torque at every angle.
Lifting and lowering are equal
A cylinder pulls with only 50–70% of its push force. The RG600 is just as strong lowering as lifting, so you size for the load, not for the cylinder's weak side.
More rotation
A cylinder limits how far an arm can travel. A drive at the pivot is limited only by the machine around it.
Share heavy joints
For joints beyond one unit's rating, two RG600s can share the load — one each side of the pivot.
Worked example: a lift arm
- A 300 kg load held 1.5 m from the pivot, with the arm level (the worst case).
- Torque = 300 kg × 9.81 × 1.5 m = 4,414 Nm.
- It needs to rise 60° in 8 seconds = 7.5°/s.
- The standard 1,600:1 ratio turns at up to about 9.4°/s, so it is fast enough — and the highest ratio needs the smallest motor.
- Power at the joint while moving = 4,414 Nm × 0.131 rad/s ≈ 0.58 kW.
Where it doesn't fit
Fast-swinging booms and digging arms that take hard impacts are still hydraulic work. The RG600 turns at up to about 3.1 rpm on 800:1, or about 6 rpm on a custom 400:1.
FAQ
How much torque does my boom joint need?
Load × 9.81 × horizontal distance from the pivot, with the arm at its most stretched-out position. Add the arm's own weight acting at its centre. 1 tonne at 1 metre is about 9,800 Nm.
Can an electric drive hold a boom in position?
Yes — there is no oil to leak past a seal, so a held arm doesn't creep down the way a cylinder can. Tell us the holding load and duty and we'll spec it.
Send us the joint
Tell us what it moves, the torque and speed, and how often it runs. We'll come back with the ratio, motor and pricing — no drawings needed to start. The RG600 is rated to 6,000 Nm continuous with 10,000 Nm max for shock and peak loads.