DC Permanent Magnet Servo Motor 184V 3000 RPM Cincinnati Milacron 1-605-0502 / Siemens 1HU4071-0AD01-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 184 VDC armature, 3000 rpm rated speed, and 7.80 Nm (5.8 lb-ft) stall torque at 14.8 A. Construction is IEC frame size 71 with a B5 flange mount, IP 54 enclosure, and class F insulation rated for 130 K rise at 40 °C ambient. This is the smallest of the three units in this group, roughly a quarter the stall torque of the 1HU4106. 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, 07 is the IEC shaft height in centimeters (71 mm, matching the "IEC 71" line on the plate), 1 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. CMI No. 1-605-0502 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 60 V at the motor's 3000 rpm rated speed, with a specified load resistance of 13 kΩ.