Dunkermotoren DC servomotors

With servomotors BG45, BG65 and BG75, Dunkermotoren has available powerful and intelligent compact drives for customised drives.

An essential feature 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 to 500 W and torques up to 5 Nm, they have reserves to take on numerous drive tasks in the industrial automation.

One of the outstanding features of the BG75 range is the availability of integrated electronic functions. The spectrum starts with regulation electronics in the SI version which, besides speed control, also permits defined acceleration and braking.

The next stage is the PI model. It provides user software for setting the motor parameters for positioning, speed and torque. The CI variant features a DSP402-compliant CANopen interface enabling modification of the significant parameters for a trajectory.

In addition to the standardised CANopen interface, the company provides Profinet IRT, based on ethernet. Other standards such as Profibus and Ethercat are available.

The MI version represents the maximum available and incorporates a freely programmable motion controller. The brushless servomotor can, independently, execute master-slave functions in a drive network.

A range of components ensures that the motors are a true alternative to servo-drives. These include a magnetic encoder, which provides the BG45 with a 4 x 256 impulses per revolution and 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°.

To achieve high torques and low rotation speeds, there is a wide range of planetary and worm gears to fit the motors. It is possible to achieve finely graduated reduction ratios down to 1:30,000. 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.