EC-i 40 Brushless Motor

Overview and Use Cases

The EC-i 40 is a brushless DC motor in Maxon Group's EC-i (electronically commutated, iron-core) product line. With a 40 mm outer diameter, it occupies a mid-range size class within Maxon's extensive motor portfolio. The iron-core winding construction allows the motor to generate higher torque per unit volume compared with coreless designs, making it well suited for applications where sustained torque output is a priority.

Typical deployment scenarios include:

• Robotics joints and actuators – collaborative robot arms, surgical robots, and exoskeletons that require precise, repeatable torque
• Industrial automation – conveyor drives, pick-and-place systems, and automated guided vehicles (AGVs)
• Mobile equipment – powered wheelchairs, service robots, and compact mobile platforms where space and weight budgets are constrained

Key Technical Characteristics

The EC-i 40 is defined by several design attributes, though buyers should consult Maxon's official datasheets for exact specifications across the range of available winding variants:

• Motor type: Brushless DC (BLDC) with iron-core stator windings
• Outer diameter: 40 mm
• Commutation: Electronic (requires an external controller or Maxon's own ESCON/EPOS driver family)
• Cogging torque: Reported to be low relative to other iron-core motors of comparable size, supporting smooth velocity control
• Torque density: Higher than coreless motors of the same diameter, enabling compact high-torque drive solutions
• Winding options: Multiple winding variants are typically offered to suit different voltage and speed requirements

Because the EC-i 40 is a component rather than a complete system, runtime and payload figures depend entirely on the host machine's design and the matched controller/gearhead configuration.

Comparison Within Maxon's Portfolio

Maxon offers a wide range of brushless motors, and the EC-i 40 sits alongside several related families:

• EC (coreless) series – Maxon's coreless BLDC motors offer near-zero cogging torque and very high efficiency, but typically lower peak torque than the iron-core EC-i at the same diameter.
• EC-i 30 / EC-i 52 – Smaller and larger siblings in the EC-i line provide scalability; the EC-i 40 bridges the gap for applications needing moderate torque in a mid-size envelope.
• DCX series – Maxon's brushed DC motors serve cost-sensitive or simpler control applications where electronic commutation infrastructure is not available.

The EC-i 40 is therefore a natural choice when an application outgrows the EC-i 30 but does not require the larger footprint of the EC-i 52.

Market Context and Target Buyers

Maxon Group products are generally positioned in the premium segment of the precision drive market, reflecting the company's focus on quality, longevity, and application engineering support. The EC-i 40 is typically purchased by:

• Robotics OEMs integrating motors into joint modules or end-effectors
• Medical device manufacturers requiring certified, reliable actuation
• Research institutions building custom robotic platforms
• Industrial automation integrators specifying drives for high-cycle-rate machinery

As a component product, the EC-i 40 is sold through Maxon's direct sales network and authorized distributors worldwide. Pricing varies by winding variant, quantity, and regional market; prospective buyers are advised to request a formal quotation.

Notable Deployments and Industry Context

Maxon motors as a family have a well-documented history in demanding applications, including space exploration hardware and surgical robotics, though specific deployment records for the EC-i 40 model are not always publicly disclosed. The broader EC-i series is reportedly used in collaborative robot (cobot) joints and rehabilitation exoskeletons, where the combination of torque density and smooth commutation is particularly valued.

The growing adoption of cobots and mobile service robots in manufacturing and healthcare is expanding demand for compact, high-torque BLDC motors, a trend that positions the EC-i 40 favorably in the mid-2020s market landscape.

Future Outlook

As robotics applications continue to push for higher power density and tighter integration, iron-core BLDC motors like the EC-i 40 are expected to remain relevant alongside emerging technologies such as integrated joint modules and direct-drive actuators. Maxon has historically updated its EC-i series with new winding options and improved magnetic materials; future variants may offer enhanced efficiency or expanded torque ranges. Engineers evaluating the EC-i 40 should monitor Maxon's official product pages for the latest revisions and certifications.