CubeMars RI70-KV95

The RI70 is a frameless inrunner torque motor. Its space-saving design lets it fit into low-volume builds.

Key features

• High torque density. With no housing or end cap, all of the weight goes into producing torque.
• Low cogging torque. Smooth, vibration-free rotation even at low speeds.
• Ultra-compact design. Fits directly into low-volume mechanisms.
• Optional Hall sensor. A Hall sensor can be added when needed to improve feedback accuracy.

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 RI70 is a frameless torque motor. The bearing, encoder and driver are part of your design. It delivers 0.94 Nm continuous and 2.68 Nm peak torque. Its main difference is the wide 38 mm center bore, which can take cables, a shaft or the input shaft of a harmonic drive.

In robot joints the motor is usually paired with a gearbox. For example, with a 50:1 harmonic drive you get about 47 Nm of continuous torque at the output, excluding losses. That is enough for the elbow and wrist of a mid-size collaborative robot arm.

How it compares to similar models

• RI60 KV120. Smaller and lighter, with 0.57 Nm rated torque and 155.9 g, and a 30 mm center bore.
• RI75-PH KV70. Gives 1.2 Nm rated torque. Its windings are encapsulated in potting compound, so it handles vibration and heat better. It weighs 348 g.
• RI80 V2.0 KV75. A higher class with 1.45 Nm rated and 4.1 Nm peak torque, weighing 411 g.

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 7.1 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 1,956, 2,934 and 3,912 rpm respectively.

Does it have a Hall sensor?

The Hall sensor is optional. If you will use a driver with Hall input, choose the version with the sensor.

What is its torque constant?

Kt is about 0.13 Nm/A. Around 7.1 A of phase current is needed for the 0.94 Nm rated torque.

In the box

• RI70-KV95 frameless inrunner torque motor

Box size 100 x 100 x 50 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.