DC Permanent Magnet Servo Motor 185V 2600 RPM Cincinnati Milacron 1-605-0525 / Siemens 1HU4106-0AD01-Z w/ Tachometer

This is a brushed permanent-magnet DC servo motor manufactured by Siemens and private-labeled for Cincinnati Milacron machine tools. In a permanent-magnet DC servo motor the stator field is supplied by fixed magnets rather than a wound field coil, so output torque is directly proportional to armature current and shaft speed is proportional to applied armature voltage. This differs from a wound-field DC motor, where field strength is separately controlled, and from the brushless AC servo motors that replaced this family (Siemens 1FT5 and 1FT6), where a permanent-magnet rotor is electronically commutated by the drive. The motor is not connected to line power: it runs from a four-quadrant DC servo amplifier that regulates armature voltage and current, with velocity feedback provided by the integral tachogenerator mounted at the rear of the machine. Nameplate ratings are 183 VDC armature, 2600 rpm rated speed, and 30.0 Nm (22.1 lb-ft) stall torque at 49.7 A. Construction is IEC frame size 100 with a B5 flange mount, IP 54 enclosure, class F insulation rated for 130 K rise at 40 °C ambient, and an internal thermal protector that trips at 112 °C. Motors in this family were used as feed-axis and spindle-orientation drives on Cincinnati Milacron CNC machining centers, lathes, and grinders.

Model number decode: 1HU is the Siemens permanent-magnet DC servomotor series, 4 identifies the design series within that family, 10 is the IEC shaft height in centimeters (100 mm, matching the "IEC 100" line on the plate), 6 is the rotor core length code within that frame, and 0AD01 is the winding and rated-speed variant. The trailing Z indicates a factory options build, with the applicable option codes stamped on the plate as A31 and K20. CMI No. 1-605-0525 is Cincinnati Milacron's own part number for this exact configuration. The feedback device is a Siemens 1HU1052 DC tachogenerator rated 20 V per 1000 rpm, which produces roughly 52 V at the motor's 2600 rpm rated speed, with resistance marked on the plate as 13 kΩ.