Angular servo drive with 2 brakes PK-MB-EZ

Planetary gearbox with bevel gear stage, servo motor, encoder, and two ServoSTOP safety brakes. Power range 1.5 – 19.0 kW. Gear ratios from 12:1 – 194:1. Maximum brake torque 8 – 72 Nm. Maximum gearbox torque 181 – 3,105 Nm. Backlash 1.5 – 5.0 arcmin. Efficiency 94%. Servo gearmotor optionally available with reduced backlash, resolver, fan, and brake release. Supplied with a STOBER servo drive system including motion controller, cables, and resistor.

PK-MB-EZ Angular Servo Drive with 2 Brakes

PK Angular Planetary Gearboxes

• Precision gearboxes with a choice of standard or reduced backlash.
• Fractional gear ratios eliminate positioning errors.
• Quiet operation thanks to helical gear teeth.
• Maintenance-free, no oil change required.
• Lubricated for the entire service life.
• Mounting position to be specified when ordering.
• Ambient temperature range: 0°C to 40°C (other ranges available on request).
• Standard filling: synthetic grease CLP HC ISO VG 150.
• Mineral oil for food, beverage, and pharmaceutical applications available on request.
• Maximum permissible gearbox temperature (measured on the housing surface): ≤ 80°C.
• Protection class IP65, optionally IP66.
• Output shaft sealing: standard NBR, optional FKM.
• For duty cycles > 60% and higher ambient temperatures, FKM radial shaft seals on the output are recommended.
• Optional reinforced output bearing.
• Cast iron gearbox housing.
• Direct mounting of STOBER EZ/LM series servo motors without adapter, coupling, or dual brake is possible.
• Standard coating: black RAL9005 (other colors available on request).

Output Shaft Types for PK Angular Planetary Gearboxes

• P – solid shaft with key.
• G – solid smooth shaft.

Servo Motor Adapter (MB) with ServoSTOP Brake

• The spring-applied brake is integrated into the motor adapter.
• Provides a holding brake function.
• Enables braking from full speed, e.g. in case of voltage drop or emergency shutdown in hazardous situations.
• Can operate as a single brake or in combination with the motor brake as a redundant braking system.
• Electrically actuated for dry operation.
• Equipped with a backlash-free plug-in coupling (jaw coupling), allowing easy motor removal while the axis remains braked in any position.
• Electrical release monitoring in the terminal box via a contactless, wear-free proximity switch.
• Manual wear monitoring via air-gap inspection using a feeler gauge.
• FKM radial shaft seals with dual sealing lips.
• Four oil drain holes protect the brakes against oil contamination in case of leakage.
• Differential-redundant system compliant with EN ISO 13849-1.
• Electrical connection as standard via terminal box, optionally as a plug connector (not possible in combination with release monitoring).
• In de-energized state, braking is achieved by spring force.
• Released by a DC electromagnetic coil before motor start-up.
• Motor connectors or motor adapter terminal box/plug connector are mounted in the 270° position.
• Together with the motor brake, this provides a dual-brake solution with exceptionally compact dimensions.

EZ Servo Motors

• Electric permanent magnet synchronous motors.
• Rotatable plug connectors with quick-lock mechanism.
• Operating ambient temperature range: -15°C to +40°C.
• Protection class IP56.
• Temperature class F (155°C).
• Electronic nameplate for fast identification of servo motor parameters.
• Rolling bearings with lifetime lubrication and non-contact sealing.
• FKM (Viton) radial shaft seals.
• Radial and axial runout according to IEC 60072-1 tolerance standards.
• Noise emission values in accordance with EN 60034-9.
• Not suitable for use in explosive atmospheres.
• CE, UKCA, optionally cURus certified.
• Integrated PTC thermistor.
• Black finish RAL9005.

Feedback systems for EZ servo motors

• Resolvers.
• Absolute encoders EnDAT 2.1 / 2.2.
• Inductive and optical encoders.
• Multiturn / Singleturn encoders.
• Single-cable OCS solution with EnDat 3.0 absolute encoder (EQI 1131) for cable lengths up to 100 m.
• Elimination of referencing for multiturn absolute encoders.

Compatibility of EZ servo motors with servo drives

• STOBER single-axis drives SB6 and SD6.
• STOBER dual-axis drives SC6.
• STOBER multi-axis drives SI6.
• B&R ACOPOS systems.
• Beckhoff AX5000 drives.
• Kollmorgen AKD, S300, S400, S600 drives.
• Siemens SINAMICS S120.
• Bosch Rexroth drive systems.
• Allen-Bradley servo systems.