With the servomotors BG45, BG65 and BG75, Dunkermotoren provides powerful and intelligent compact drives for customised drive solutions.

Essential feature of the product line is the integration of different logic and power electronics. Electronically commutated DC motors now incorporate functions that were previously the preserve of AC servomotors. This is demonstrated by the BG75 DC motors. With output power up to 500 Watt and torques up to 5 Nm, they have sufficient reserves to take on numerous drive tasks in the industrial automation. Combined with components selected from a comprehensive package of equipment, such a motor becomes a fully-fledged, cost-effective and compact servo-drive.

These motors are available with a variety of integrated electronic functions. The spectrum starts with regulation electronics in the SI version, which, besides speed control, also permits defined acceleration and braking operations. The next stage is the PI model. It 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.

Dunkermotoren provides the forward-looking communication interface Profinet IRT, based on Ethernet. Other standards such as Profibus and Ethercat are available for projects. The MI version represents the maximum available, and incorporates a freely programmable motion controller. The brushless DC- servomotor can, independently, execute master-slave functions in a drive network.

On the one hand, they reduce the amount of wiring and cost of installation, and, on the other, they can take over control and regulation functions and so relieve a higher level PLC of the task of handling computation-intensive control algorithms.

The brushless DC-servo motors are a true alternative to servo-drives. These include a magnetic encoder, which provides at the BG45 4 x 256 impulses per revolution and at the BG754 x 1024 impulses per revolution. It is installed as standard in the PI, CI and MI version of this motor. Optionally, the absolute encoder AE50 can be fitted; it has a repeatability of 0.3°. With it, highly accurate positioning applications can be realised.

To achieve high torques and low speeds of rotation, there is a wide range of planetary and worm gears that fit the brushless DC- servo motors. By carefully selecting combinations from the comprehensive Dunkermotoren modular system, it is possible to achieve finely graduated reduction ratios down to 1:30000. A special advantage of the planetary gears is their whole-number reduction ratios. They considerably simplify precision positioning applications in conjunction with a DC- servomotor with integrated encoder.

For the active braking of motions and power-on holding, there is a range of brakes, with their extruded-aluminium housings, fit the DC- servomotor BG75 perfectly. The E300 R brake achieves up to 3 Nm holding moment, and can thus cope with the full continuous torque of the motor. The advantage of the E90 R is that it can also be employed as a dynamic brake. Both versions are spring-operated, electrically released brakes.

For more information, contact M Rutty & Co.

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