CubeMars RI20 KV600

The RI20 KV600 is the smallest frameless inrunner torque motor from CubeMars. It consists only of a stator and a rotor, with a 25 mm outer diameter and a weight of 20 g. The housing, bearings, encoder and driver are left to your own design, which makes it a good fit for miniature joints where every gram and every millimeter counts.

Key features

• 20 g, Ø25 mm. The motor is 25 mm in diameter and 14.5 mm high, solving space problems in precision medical devices and small robot joints.
• High KV, fast response. At 16 V it reaches 9600 rpm no-load speed and delivers 72 mNm peak torque. Rotor inertia is only 1.38 g·cm².
• Ø11.6 mm through-bore. Despite the small body, the large center bore can carry signal wires, thin power lines or pneumatic tubing.
• Low cogging torque. Cogging torque is 0.946 N·mm, which reduces torque ripple at low and high speed for smoother servo control.
• Class H insulation. The 12-slot, 7 pole pair winding has class H insulation and operates from -20 °C to 50 °C.

Applications

Typical applications include miniature robot joints, robotic hand and finger mechanisms, precision medical devices, small collaborative robot joints and compact automation systems.

Is it enough for your project?

The RI20 KV600 delivers 0.024 Nm rated and 0.072 Nm peak torque. For example, a 50 g load at the tip of a 4 cm finger segment needs about 0.02 Nm of static torque (0.05 × 9.81 × 0.04). That load stays within the motor's rated torque. For heavier loads the motor is paired with a gearbox, and output torque rises with the reduction ratio.

It runs on 16 V, with a rated speed of 7452 rpm, a rated current of 1.47 A and a peak current of 4.4 A. Maximum continuous power is 18 W. If you need more torque the RI30 KV260 may be a better fit, and for much more torque, the RI50-KV100.

How it compares to similar models

• RI30 KV260. The next model in the same family. At 24 V it gives 0.076 Nm rated and 0.23 Nm peak torque, weighs 40 g and has a Ø17 mm through-bore. Its no-load speed is lower at 6240 rpm.
• RI50-KV100. At 48 V it gives 0.58 Nm rated and 1.67 Nm peak torque. In return it weighs 180.8 g and measures Ø54 × 27 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, bearings and housing are chosen by the user for the project.

Does it have Hall sensors?

No. The manufacturer supplies this model without Hall sensors, and the wiring table lists only the U, V and W phase leads. An encoder should be used for commutation and position.

What are the leads like?

The three phase leads are 200 mm long and 28 AWG. U is black, V is yellow and W is red.

In the box

• RI20 KV600 frameless torque motor

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.

Return conditions for international shipments are confirmed before purchase.