Product Description:

The SE-B4.090.050-04.000 is a synchronous servo motor manufactured by Bosch Rexroth Indramat as part of the SE Synchronous Servo Motors series. It converts regulated three-phase drive output into rapid shaft rotation for positioning, conveying, or spindle functions in automated equipment. To prevent load drift when the controller is disabled, the unit uses a spring-applied electromagnetic brake that can be commanded from the drive for quick holding and release during normal machine cycles. This arrangement supports applications that need controlled stopping behavior as well as stable shaft holding between motion commands.

Under rated conditions, the rotor reaches a synchronized speed of 5000 rpm, allowing high-cycle operation without reduction gears. During acceleration or short overloads, the electromagnetic system can generate a maximum torque of 23.0 Nm while drawing up to 85 A of phase current, and continuous holding at standstill is supported by 14 A of current that produces 8.0 Nm to resist static loads. The torque constant is 0.57 Nm/A, and the back EMF constant is 68 V/1000 rpm, which helps match the motor to a suitable drive and supply voltage. Dynamic response is characterized by a 9.5 ms electrical time constant, so current rises quickly after a command and supports rapid changes in motor output.

Magnetic characteristics include an inductance of 9.0 mH and a phase resistance of 0.94 ohms, and these values affect copper losses and current-loop behavior in the connected servo drive. With the brake installed, the assembly weighs 15 kg and has an overall length of 299 mm, which matters when the motor is mounted on moving axes or in compact machine spaces. A splined shaft sized at 24 × 50 mm transfers torque directly to couplings or planetary gearboxes. The brake disengages in 50 ms and engages in 55 ms, while a 60 ms ramp-up time allows the rotor to reach operating speed quickly after startup without excessive inrush.