Product Description:

The SD-A4.140.020-01.104 is part of the SD Magnet Motors series by Bosch Rexroth Indramat. This brushless servo motor is designed for precise position and speed control in automated machinery such as packaging axes and pick-and-place gantries. Its permanent-magnet rotor, resolver feedback, and three-phase stator windings allow closed-loop regulation through a compatible drive controller. The drive can use that feedback to correct speed deviation and maintain accurate positioning during starts, stops, and direction changes. By combining high torque density with electronic commutation, the motor delivers repeatable motion profiles while reducing maintenance compared with brushed designs.

At standstill, the motor delivers 14.0 Nm of torque, giving the axis enough holding force for mid-size loads without an external brake. Under rated excitation, the rotor reaches a nominal speed of 2000 rpm, which suits typical indexer and conveyor cycles. A winding thermistor sends a stop command when the winding reaches 140 °C, helping prevent insulation breakdown during operation. Magnetic flux is produced by a ferrite magnet set, so demagnetization risk stays low even during overload. For speed feedback, a tacho winding produces 2.7 V per 1000 rpm ±5%, allowing the drive to derive velocity from the analog signal and regulate motion with stable response.

For installation, the stator terminals accept phase conductors on nodes U2, V2, and W2, with a power lug sized for 1.5 mm² leads. Hall-effect commutation outputs labeled A, B, C, 1, 2, 3 synchronize the inverter’s current vectors with rotor position, while a brushless DC tacho supplies velocity data through the same multi-core harness. The encoder cable uses 10 control pairs of 0.14 mm² and four power cores of 0.5 mm², and it can be routed up to 100 m without signal repeaters. This layout keeps power, commutation, and feedback connections organized inside compact machine frames. These transducers draw a stabilized ±15 V DC supply from the drive, which helps maintain clean reference levels for the position and speed loops.