Product Description:

The B2.SM.000-4200 is a synchronous servo motor built by KEB within the SM Synchronous Servo Motors series. Designed for closed-loop positioning and velocity control, the unit converts electrical energy into precisely regulated rotary motion for pick-and-place stations, packaging lines, and other automated machinery.

During continuous duty the motor is energized with a supply of 230 V, delivering a mechanical output of 540 W at the rated operating point. Its rated shaft speed of 4000 rpm matches drive controllers that issue high-resolution velocity commands, while a stall torque of 1.5 Nm secures loads when motion is momentarily halted. Reaching this stall torque draws only 3.2 A, so cabinet-mounted electronics can be sized modestly; however, transient peaks up to 19.2 A must be tolerated during rapid acceleration. The rated phase current is 2.9 A, providing the reference for thermal calculations and drive sizing. At the same rated point the device develops 1.3 Nm of continuous torque with a winding inductance of 11.5 mH and a phase resistance of 4 Ω, figures that shape current loop bandwidth and heat dissipation. The 39.2 V/1000 rpm voltage constant links back-EMF to speed feedback for the drive regulator.

The motor’s dynamic envelope extends beyond the nominal ratings. It can exert a maximum torque of 7.2 Nm until thermal limits are approached, and still turns at 3450 rpm while doing so, maintaining throughput on torque-demanding cycles. With the load removed, the rotor reaches a no-load velocity of 6850 rpm, an attribute useful for indexing moves that favor short cycle times. A rotor inertia of 0.36 kg cm² balances quick acceleration against speed stability, while the total assembly weight of 2.1 kg eases installation on compact axes. These relationships between inertia, peak torque, and speed allow the SM motor to pair with low-ratio gearheads or direct-drive couplings without overshoot.