Product Description:

The MAC90A-0-RD-2-C/110-A-0 is an AC servo motor produced by Bosch Rexroth Indramat for the MAC AC Servo Motors series. It is intended for analog drive systems in which position and velocity loops are closed inside the amplifier, allowing the motor to supply precise mechanical power to automated tooling, packaging lines, or pick-and-place axes. In these applications, the unit converts electrical energy into controlled rotary torque while the integrated tachogenerator supplies speed feedback to the associated drive electronics. This arrangement supports responsive speed regulation without requiring a digital position encoder inside the motor.

Under continuous stall conditions, the motor can develop 3.5 Nm while drawing a steady 11.4 A; this combination establishes the thermal load that natural convection must dissipate from the stator. Rated operation reaches a shaft speed of 3000 rpm, providing ample speed for gear-reduced transmissions. For rapid indexing, a drive can command a peak current pulse of 76 A, producing short-term torque several times greater than the continuous value without exceeding the winding insulation limits. Each ampere of phase current produces approximately 0.34 Nm/A, allowing current-mode amplifiers to estimate torque output with linear accuracy. Heat is removed by ambient airflow because the motor uses natural convection cooling. Position encoders are absent, so the tachogenerator instead provides an analog voltage proportional to speed. Power is routed through connectors on side A, and the winding resistance is 0.56 ohms.

Mechanical alignment is provided by a 110 mm centering diameter that locates the flange accurately against the machine frame. The assembly weighs 12.5 kg, and its rotor inertia is 20 × 10⁻⁴ kg·m², balancing quick acceleration with stable speed regulation. Thermal behavior follows a 45-minute time constant, so changes in loading alter the winding temperature gradually rather than immediately. The laminated stack has a phase inductance of 3.2 mH, which influences the current-loop bandwidth of the analog drive. The standard tachogenerator produces 3 V per 1000 rpm, matching common controller scaling. These electrical and feedback characteristics allow the amplifier to regulate motor speed while monitoring the current used to generate torque.