What are Festo servomotors and what industrial applications do they serve?

Festo servomotors are precision AC servo drives designed for closed-loop position control in demanding automation applications. These motors excel in packaging machinery, assembly lines, CNC machine tools, robotic systems, and material handling equipment where precise positioning accuracy within ±0.1° is required. The EMMS-AS-190 series represents Festo's industrial-grade servomotors specifically engineered for continuous operation in manufacturing environments including automotive production, pharmaceutical packaging, and semiconductor fabrication facilities.

What are the key technical selection criteria for Festo servomotors?

Critical selection parameters for Festo servomotors include rated torque output ranging from 0.5 to 15 Nm, maximum speed capabilities up to 6000 rpm, and feedback resolution typically 20-bit absolute or incremental encoders. The EMMS-AS-190 series offers multiple flange sizes including 90mm and 142mm mounting options with various shaft configurations denoted by the MK, M, SK, and S designations. Power ratings span from 100W to 3kW with 24VDC control voltage and 400VAC three-phase power supply requirements for optimal performance in industrial automation systems.

Which international standards and certifications apply to Festo servomotors?

Festo servomotors comply with IEC 60034 electrical machine standards for motor construction and performance characteristics, plus EN 61800-5-1 for adjustable speed electrical power drive systems safety requirements. These motors meet CE marking requirements under the Machinery Directive 2006/42/EC and EMC Directive 2014/30/EU for electromagnetic compatibility in industrial environments. Additionally, they conform to ISO 9001 quality management standards and carry UL recognition for North American installations, ensuring global regulatory compliance for international automation projects.

What are the differences between Festo EMMS-AS-190 servomotor variants?

The EMMS-AS-190 series differentiates primarily through flange mounting options where MK indicates keyed shaft with larger flange, M represents standard mounting flange, SK denotes small keyed shaft, and S signifies compact flange design. The suffix codes AMB, ARB, and ASB specify different feedback systems and brake configurations, with AMB providing absolute encoder feedback, ARB offering resolver feedback, and ASB incorporating electromagnetic holding brakes. The S1 designation indicates enhanced environmental sealing rated to IP65 for harsh industrial conditions compared to standard IP54 protection.

What are the installation requirements and system compatibility for Festo servomotors?

Festo servomotors require dedicated servo amplifiers with compatible fieldbus communication such as EtherCAT, Profinet, or DeviceNet for integration into automation systems. Installation demands rigid mechanical mounting with maximum radial shaft load of 250N and axial load of 125N, plus adequate ventilation clearance of minimum 50mm around motor housing. The motors accept standard M12 and M23 circular connectors for power and feedback cables, with shielded cable lengths up to 50 meters without signal degradation when properly grounded to the control cabinet earth system.

What are the safety ratings and operating conditions for Festo servomotors?

Festo servomotors achieve IP65 ingress protection rating in the S1 variants and IP54 in standard models, suitable for industrial environments with dust and moisture exposure. Operating temperature range spans -10°C to +45°C ambient with maximum winding temperature of 155°C class F insulation, while storage temperature extends from -25°C to +70°C. The motors function reliably at altitudes up to 1000 meters above sea level with relative humidity up to 95% non-condensing, meeting the demanding environmental conditions found in automated manufacturing facilities.

What maintenance schedule and service life do Festo servomotors require?

Festo servomotors deliver 20,000 operating hours service life under normal industrial conditions with minimal maintenance requirements due to their brushless design and sealed bearing construction. Preventive maintenance involves quarterly visual inspection of cable connections and mounting bolts, plus annual encoder calibration verification to maintain positioning accuracy within specification. Ball bearing replacement is typically required after 15,000 to 25,000 operating hours depending on load conditions, with Festo recommending vibration analysis monitoring above 10,000 hours to predict bearing condition and schedule replacement during planned downtime.

Servo motors

Motors and controllers

Festo EMMS-AS servo motors are permanently magnetised synchronous motors for precision positioning tasks in combination with Festo motor controllers. Flange sizes range from 55 mm to 190 mm (motor housing OD), with short (S), medium (M) and long (L) body versions and cable-exit variants (MK, LK, SK). Options include holding brake (-B) and multiturn resolver feedback (-RS/-RM/-AM/-AR/-AS) for absolute or incremental position return.

⚡ Flange sizes 55, 100, 140, 190 mm - matched to EMGA gearboxes and CMMP/CMMT controllers

✓ Holding brake (-B suffix) - spring-applied brake, fail-safe in de-energised state

⚙ Resolver feedback - multiturn absolute (-AM/-AR/-AS/-ASB) or single-turn (-RM/-RS)

⬡ Protection class IP65 - suitable for industrial environments with splash water

✦ 190 mm flange EMMS-AS-190 - high-dynamic version with safety option (-S1) available

Frame size	Body form	Feedback	Holding brake
EMMS-AS-140	S, L, SK, LK	-RM (single-turn), -RS (single-turn)	-B suffix
EMMS-AS-190	S, M, SK, MK, LK	-AM, -AR, -AS (absolute, multiturn)	-B suffix, safety -S1

Typical applications: Electrical linear axes and ball screw drives in assembly and handling machines, rotary tables and swivel axes in machining centres, dosing units in process technology, and multi-axis positioning with CMMP-AS controller and PROFINET/EtherCAT connectivity.