DC motor and drive packages

Electronically commutated DC motors now incorporate functions that were previously the preserve of AC servo-motors. With output powers up to 500 W and torques up to 5 Nm, the BG75 DC motors by Dunkermotoren are able to take on numerous drive tasks in industrial automation. Combined with components selected from a package of equipment gear and brake equipment, such a motor becomes a fully-fledged, cost-effective and compact servo-drive.

The BG75 range is available with a variety of integrated electronic functions. Regulation electronics in the SI version, besides speed control, also permit defined acceleration and braking operations. The PI model provides convenient user software for setting the motor parameters for positioning, speed and torque. The CI variant features a DSP402-compliant CANopen interface. This enables modification of the significant parameters for a trajectory ‘on the fly’. The MI version incorporates a freely programmable motion controller. With it, a DC motor can independently execute master-slave functions in a drive network. A particular advantage of these integral control and regulation electronics is, on the one hand, that they reduce the amount of wiring and cost of installation and on the other, that they can take over control and regulation functions and so relieve a PLC of the task of handling computation-intensive control algorithms.

A range of carefully adapted components ensures that the brushless BG75 motors are a true alternative to servo-drives. These include a magnetic encoder, which provides 4 x 1024 impulses per revolution and is installed as standard in the PI, CI and MI versions of this motor. Optionally, the absolute encoder AE50 can be fitted, which has a repeatability of 0.3°.