The QSY Synchronous Servo Motors from Bosch Rexroth Indramat comprise a range of permanent-magnet synchronous feed motors intended for NC-controlled machine tools and designed to run with compatible controls and inverters in industrial environments (use in potentially explosive atmospheres is prohibited).
They use sinusoidal commutation with an integrated rotary encoder for rotor position and speed feedback, offered as an ERN 1387 incremental encoder (≈1 VPP) or ECN 1313 / EQN 1325 absolute encoders (EnDat 2.2) in singleturn or multiturn form. The series is specified for smooth motion and low torque ripple while maintaining an application-appropriate mass moment of inertia and a strong rated-to-stall torque relationship for precise feed-axis control. Mechanically, QSY motors are flange-mounted (IM B5) with IP65 motor protection (IP64 shaft exit), maintenance-free bearings with a stated nominal bearing service life of 30,000 hours under defined load/speed conditions, and optional shaft keyway and holding brake variants. Thermal and commissioning features include KTY 84-130 stator temperature monitoring (thermal class F), optional EcoDyn variants that reduce current while increasing rated torque (with a rated speed limit depending on control type), and an electronic ID label on absolute-encoder versions to support automatic motor identification and diagnostics.
