CubeMars RO40 KV140 Lite

The RO40 KV140 Lite is the smallest outrunner frameless torque motor in the RO series. In the Lite version the outer housing and Hall sensors are removed and only the motor core remains. It is 46.3 mm in diameter, 13 mm high and weighs 60 g. It is designed to be built directly into precision joints, gimbals and custom gearboxes.

Key features

• Very low cogging torque. Cogging torque is 6 N·mm. The manufacturer states it is 50 percent lower than similar motors, so there is no stutter at low speed.
• 60 g, 0.6 Nm. The caseless Lite design cuts weight significantly. The torque to weight ratio is 10 Nm/kg.
• Large hollow stator. Power cables, signal wires or mechanical shafts can pass coaxially through the wide center of the stator.
• Deep gearbox integration. The very compact structure suits integration with harmonic and planetary gearboxes in a single housing.
• Your choice of encoder. It works with various high-resolution encoders, which suits the development of non-standard equipment.

Applications

Typical applications include small robot joints, gimbal mechanisms, compact actuators with custom gearboxes and non-standard automation equipment.

Is it enough for your project?

The RO40 KV140 Lite delivers 0.2 Nm rated and 0.6 Nm peak torque. For example, a 0.5 kg load with a 3 cm offset needs about 0.15 Nm of static torque (0.5 × 9.81 × 0.03). That load stays within the motor's rated torque. For longer arms the motor is used with a gearbox, and output torque rises with the reduction ratio.

It runs on 24 V, with a no-load speed of 3400 rpm and a rated speed of 2450 rpm. Rated current is 2.85 A, peak current is 11.6 A and maximum continuous power is 51 W. If you need more torque, the RO50 KV108 Lite or the RO60Lite-KV115 may be a better fit.

How it compares to similar models

• RO50 KV108 Lite. The next model in the Lite family. At 24 V it gives 0.3 Nm rated and 0.9 Nm peak torque, weighs 105 g and measures Ø61.7 × 14.5 mm.
• RO60Lite-KV115. At 48 V it gives 0.8 Nm rated and 2.4 Nm peak torque. It weighs 195 g and measures Ø70.5 × 15 mm.
• RO60 KV115. The standard RO60 with housing and Hall sensors. It gives the same torque figures at 248 g and Ø73.8 × 23 mm.

Frequently asked questions

Are the driver and encoder included?

No. A frameless motor consists only of a stator and a rotor. The driver, encoder and gearbox are chosen by the user for the project.

Does it have Hall sensors?

No. The Lite version has no Hall sensor and no temperature sensor. An encoder should be used for commutation and position, and the driver should support FOC control.

What is the difference between Lite and a standard RO motor?

The Lite version drops the outer housing and sensors. Electrical figures stay the same while weight and height go down, and the motor fits directly into your own mechanical structure.

In the box

• RO40 KV140 Lite outrunner frameless torque motor
• Certificate of conformity

Box size 89 x 91 x 73 mm.

Related products

Our team can help you choose a driver, an encoder and the mounting design.

Products in stock are dispatched within 3 business days from our warehouse in Turkey.

Shipping cost and delivery time to your country are shown at checkout. For models not listed in stock, ask our technical team about the lead time.

To start a return, contact us through our technical team. The product must be unused, undamaged and in its original packaging.

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