SG-S-3-842-403-417 Bosch Rexroth Indramat
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The Bosch Rexroth Indramat SG-S-3-842-403-417 is a brushless servo motor from the SG Synchronous Servo Motors series. It features a resolver encoder for rotor orientation and spindle speed, and uses SmCo samarium-cobalt magnets. The motor operates in ambient temperatures from 0 to 40 °C and is protected by an IP65 enclosure with insulation class F.
Internal Product Review
The SG-S-3-842-403-417 is a brushless servo motor built for precise spindle-duty performance in industrial motion applications. Thermal radiation and natural convection cooling support efficient operation, while resolver feedback provides dependable rotor orientation and spindle speed control. IP65 protection and SmCo magnet material make the unit a strong choice for demanding installations.
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Product Description:
The SG-S-3-842-403-417 is a synchronous servo motor in the SG Synchronous Servo Motors series manufactured by Bosch Rexroth Indramat. It serves as a compact drive source for numerically controlled axes, translating regulated current from a matching servo amplifier into precise rotary movement for machine tools, pick-and-place gantries, and other motion-critical stations. Its integrated position feedback allows automation controllers to maintain tight velocity and position loops without external sensors, while its brushless construction reduces routine service requirements. The motor can support applications that require controlled acceleration, repeatable positioning, and consistent response during frequent changes in direction.
The allowable operating temperature spans 0 to 40 °C, so the unit can function in typical production areas without dedicated air conditioning. Heat produced during cyclic loading is removed through thermal radiation and natural convection, eliminating the need for auxiliary blowers and their associated wiring. A shaft-mounted resolver supplies continuous rotor-angle data to the drive, keeping electronic commutation synchronized even during rapid reversals. The windings use class F insulation according to VDE 0530, providing a thermal ceiling of 155 °C during overload events. Magnetic torque is delivered by a rotor containing SmCo permanent magnets, an alloy that resists demagnetization at elevated temperatures and preserves torque linearity throughout the operating cycle.
The aluminum housing with IP65 protection prevents dust ingress and withstands low-pressure washdowns encountered near cutting fluids or cleaning sprays. Its architecture as a brushless servo motor eliminates brush arcing and avoids the mechanical wear associated with conventional brush assemblies. Adequate clearance around the cooling fins allows air to circulate freely across the housing during operation. Keeping these airflow paths unobstructed helps natural convection remove heat from the motor surface under cyclic loads. The sealed enclosure also protects internal components while allowing the motor to operate near machinery where airborne particles and occasional moisture are present.
