Product Description:

The SR-A4.0091.030-14.000 is a synchronous servo motor manufactured by Bosch Rexroth Indramat for the SR Synchronous Servo Motors series. Designed for precision axis control in automated assembly lines, the unit delivers repeatable torque and rapid acceleration so machine controllers can position loads accurately. A flange-mounted electromagnetic brake is integrated into the motor so the shaft can be locked when power is removed, making the unit suitable for vertical or safety-critical axes in packaging, printing, and handling equipment.

During holding conditions, the brake receives 24 V DC and draws 0.7 A, generating a holding torque of 18 Nm. The square mounting interface follows a DIN 42948 outline with a flange diameter of 142 mm, allowing direct attachment to reducers or driven elements without adapter plates. Power is transmitted through a keyed steel shaft that measures 24 × 50 mm, providing sufficient surface area for couplings while keeping rotor inertia moderate. If the shaft is blocked mechanically, the windings can withstand a locked-rotor current of 7.0 A and deliver 10 Nm of startup torque for brief periods. The combined inertia of the rotor and brake is 3.1 × 10⁻⁴ kg·m², supporting fast stops when the brake is energized.

Dynamic operation relies on a resolver that supplies analog sine-cosine position signals and an incremental track of 8,192 increments per revolution, allowing the drive to interpolate fine motion steps. At its rated speed of 3,000 rpm, the motor produces continuous torque proportional to current, following a torque constant of 1.42 Nm/A. The stator laminations and aluminum housing are assembled in a 293 mm-long body that weighs 14.7 kg. Its rotor inertia is 2.1 × 10⁻³ kg·m², balancing quick acceleration with stable operation. Resolver precision is ±10 arcminutes, allowing velocity control loops to operate without excessive gain.