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Festo has launched a series of electromechanical rotary actuators that provide an exceptional level of movement flexibility.

The ERMB modules are capable of accommodating any desired angle of rotation, including a full 360 degrees and continuous unlimited rotary motion.

They feature mounting interfaces on each of their six sides and can be mounted in any position, making them easy to integrate with other axes, and have a large-diameter hollow output shaft to facilitate the feed-through of cables and tubing.

They are particularly suitable for orientating gripper units at the front end of cantilever axes, and also provide a simple low-cost means of implementing high-speed rotary positioning tables.

Festo offers three sizes of ERMB rotary modules, with maximum output torques of 3.1, 8.8 and 24Nm.

The smallest model, the ERMB-20, measures 65 x 145mm with a height of 54mm, and weighs 850g.

Despite its small form factor, the actuator can handle direct loads of up to 30kg and moments of inertia as high as

The largest model, the ERMB-32, can accommodate moments of inertia as high as 3,

ERMB series rotary modules use a pre-tensioned toothed belt to transfer power from the motor shaft to the output pinion, resulting in smooth, low-noise operation with minimal backlash.

All three models can achieve an angular velocity in excess of 30 rad/s – which translates into a 180-degree positioning time of less than 0.2 seconds – with a repetition accuracy of +/-0.03 degrees.

All ERMB series rotary modules feature a built-in homing sensor for use when indexing, and can also be equipped with an optional sensing kit for monitoring angular displacement.

The sensing kit is available with and without a protective housing, to best suit the application, and can be mounted on either side of the rotary module.

It uses two sets of easily adjustable cams in conjunction with a pair of magnetic proximity sensors to provide digital feedback to the system controller, and offers a very flexible means of implementing blocking or ‘anti-crash’ motion control sequences.

Festo’s ERMB rotary modules are mechanically compatible with the company’s extensive range of electric and pneumatic products, such as linear positioning axes and grippers, and are suitable for use with a wide range of stepper and servomotors, including third-party products.

When teamed with Festo’s MTR-DCI intelligent servomotors, ERMB rotary modules provide a complete, all-in-one programmable rotary positioning system.

These motors incorporate gearing, together with an optical encoder and all necessary controller and power electronics, in a single, compact package, and even offer a built-in LCD option which enables the axis to be commissioned at the point of use, if required.

MTR-DCI servomotors can be controlled via a variety of fieldbuses – including CANopen, Profibus DP and Devicenet – and the built-in controller is capable of storing 16 motion control programs in non-volatile memory, including acceleration and velocity profiles for rotational movement.

Customers can specify a rotary actuator, mounting interfaces and motor/drive combination in a single part number, to help reduce administration time and cost.

About Festo

Festo manufactures pneumatic and electrical components and systems to support customers with factory and process automation. The company has an annual turnover in excess of 1.7 billion Euro, employs 12,800 people around the world and has facilities in 176 countries around the world. Festo operates an aggressive R&D programme investing 7.5% of sales annually, holds over 2,800 worldwide patents, introduces about 100 innovative new products to the market every year and has a product range of over 30,000. For more information about the company’s products and services, please visit our website.  

About Festo Didactic

Festo Didactic, the training and consultancy division of Festo, supports organisations seeking to develop competencies in sales & service, leadership, employee engagement, change management, team-working, coaching, business planning, production processes and automation technology. The division has particular expertise in working with manufacturing and engineering businesses. It has a full time workforce of over 200 and operates in 70 countries worldwide. Each year, it manages more than 230 consultancy projects and runs more than 2,900 open courses in 26 languages, involving some 42,000 participants. For more information about Festo Didactic, please visit the Festo website and follow the link.

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