Motor drive package

Electronically commutated DC motors now incorporate functions that were previously the preserve of AC servomotors.

This is demonstrated by the BG75 motors from Dunkermotoren. With outputs up to 500 W and torques to 5 Nm, they can take on numerous drive tasks in industrial automation.

A major feature of the range is that the motors are available with a variety of integrated electronic functions. Regulation electronics in the SI version permits speed control and defines acceleration and braking operations. The P1 model provides user software for setting the motor parameters for positioning, speed and torque. The C1 variant features a DSP402-compliant CANopen interface. This enables modification of the significant parameters for a trajectory ‘on the fly’.

The MI version represents the maximum available and incorporates a programmable motion controller. With it, a DC motor can, independently, execute master-slave functions in a drive network.

An advantage of these integral control and regulation electronics is to reduce the wiring and cost of installation and take over control and regulation functions to relieve a higher level PLC of the task.

A range of components ensures that the motors are a true alternative to servo-drives.

These include a magnetic encoder, which provides 4 x 1024 impulses per revolution. It is installed as standard in the Pl, Cl and Ml versions 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 there is a wide range of planetary and worm gears for the motors with reduction ratios down to 1:30,000.

There is also a range of brakes. The E300 R achieves up to 3 Nm holding moment and can cope with the full continuous torque of the motor.