CubeMars RI80 V2.0 KV75

The RI80 V2.0 is a frameless inrunner torque motor with a direct drive architecture. The rotor connects directly to the load, with no gears or belts in between.

Key features

• Direct drive. With no intermediate transmission parts, transmission and precision losses are eliminated and efficiency exceeds 95%.
• 40.5 mm hollow shaft. Leaves a wide central space for cables and shaft integration.
• Ultra-low cogging torque. Smooth, stable rotation even at very low speeds.
• Modular stator. Mounting dimensions and fixing method can be customized for the application.
• Fits different shaft diameters. The rotor adapts to different shafts without extra adapters.
• Rotor ready for Hall alignment. Rotor height was increased to allow precise alignment with optional Hall sensors.
• Reduced volume. The frameless design cuts volume by more than 30% compared with enclosed motors of similar power.

Applications

Typical applications include robot arm joints, precision rotary platforms, gimbal systems, medical device drives and modular actuator designs that need high torque in a small space.

Is it enough for your project?

The RI80 V2.0 is a frameless torque motor. The bearing, encoder and driver are part of your design. It delivers 1.45 Nm continuous and 4.1 Nm peak torque from a body 27 mm tall. The 40.5 mm center bore leaves plenty of room for cables and shafts.

In direct drive it suits rotary tables and precision positioners, and with no gears there is no backlash. In robot joints it is usually paired with a gearbox. For example, with a 50:1 harmonic drive you get about 72 Nm of continuous torque at the output, excluding losses.

How it compares to similar models

• RI70 KV95. Gives 0.94 Nm rated torque, is lighter at 270.4 g and has a 38 mm center bore.
• RI85-PH KV85. At the same weight (411 g) it gives 2 Nm rated torque, with potted windings and a 52 mm center bore.
• RI100 KV105. Gives 1.76 Nm rated and 4.95 Nm peak torque, weighs 500 g and has a 45 mm center bore.

Frequently asked questions

Is the driver included?

No. With frameless motors the driver, encoder and bearing are chosen by the user. You need a FOC driver that can deliver at least 9.4 A continuous.

What voltages does it run on?

It can run on 24, 36 and 48 V. At those voltages the no-load speed is about 1,480, 2,220 and 2,960 rpm respectively.

Does it have a Hall sensor?

The Hall sensor is optional. The rotor is designed with the height needed to align precisely with Hall sensors.

What is its torque constant?

Kt is about 0.155 Nm/A. Around 9.4 A of phase current is needed for the 1.45 Nm rated torque.

In the box

• RI80 V2.0 KV75 frameless inrunner torque motor

Box size 137 x 134 x 74 mm.

Integration

Frameless motors are designed in by the user together with the flange, bearing, encoder and driver. The stator mounts to the fixed structure and the rotor to the rotating shaft. Because this leaves the whole mechanical interface to the designer, intermediate transmission parts such as gears or belts are not needed.

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.