Product Description:

The MAC90B-2-JD-3C/110-A-1 is an AC servo motor manufactured by Bosch Rexroth Indramat for the MAC AC Servo Motors series. Designed for analog drives, it supplies regulated torque and speed to machine axes in industrial automation systems. The frame uses axial surface cooling to draw heat away from the stator, while a centering diameter of 110 mm supports precise alignment with gearboxes or mounting flanges. Its IP65 enclosure protects the internal windings from dust and low-pressure water jets, allowing installation on open production lines where exposure to airborne particles or occasional water spray may occur.

At its nominal operating point, the motor reaches 3000 rpm, and the external drive regulates this speed to match process demands. When the rotor is locked, the motor can produce 10.5 Nm of continuous stall torque while drawing 28.5 A. The electromagnetic circuit has a winding inductance of 2.0 mH and a winding resistance of 0.38 Ω, which affect current rise time and copper losses during rapid acceleration. A torque constant of 0.41 Nm/A converts commanded current into mechanical output, so the rated motor phase current of 23.2 A generates approximately 9.5 Nm under a steady load. Rotor inertia is 36 × 10⁻⁴ kg·m², providing a balance between responsive acceleration and load damping. A thermal time constant of 45 minutes indicates that winding temperature changes gradually during extended operating cycles.

For intermittent movements, the drive can inject 137 A of peak pulse current, allowing the motor to overcome high acceleration demands without magnetic saturation. Position retention during a power loss is provided by a shaft brake with 6.5 Nm of holding torque. The brake coil draws 0.7 A from a 24 V DC supply, providing secure shaft clamping while limiting heat generation in the coil. This holding brake is useful when a stationary axis must remain in place after motor torque is removed, particularly when gravity or an external mechanical load could otherwise move the shaft.