Synchronous servomotors and servoamplifiers from
Beckhoff together create powerful, highly dynamic drive systems. The motors, with their
high-quality neodymium magnetic material, are particularly suitable for complex tasks
requiring high stability, such as drives for handling equipment, textile machines, machine
tools, packaging machines and the like. The large number of available fieldbus interfaces,
from Lightbus and Profibus through to CANopen or SERCOS interfaces, allow the Beckhoff
drives to be integrated into complex systems..
Fully
digital Servoamplifiers as an intelligent backbone
Servoamplifiers from the AX2000 series are integrated as components of drive systems in
electrical equipment or machines. They are operated at grounded preferably threephase
industrial mains networks. The AX2000 servoamplifiers drive the brushless synchronous
servomotors of the AM227-AM297 series with regulation of torque, speed or position. The
standard versions of the servoamplifiers are available in 4 current ratings. Interference
suppression filters are integrated into the power feeds for operation directly from the
mains, as are suppression filters for the 24 V auxiliary voltage supply. Special features
of the servoamplifiers:
The servoamplifiers are fully programmable via the RS232 serial interfaceThe servoamplifiers are fully digitally controlled
A freely programmable digital current controller and speed regulator (62.5 µs) is included in the amplifier
The integrated position controller (250 µs) can be adapted for every job
A pulse-direction interface is integrated for the connection to a stepper motor controller or a simple slave axis
Position is determined on the basis of the evaluation of resolver signals or of the sine-cosine signal of a high-resolution encoder
The digital servoamplifiers offer a large number of convenient functions. These include adjustable setvalue ramps, two analog monitor outputs, 4 programmable digital inputs (two of which are defined, as standard, as limit switch inputs) and 2 digital outputs.
Integrated safety is also strongly emphasized. In the servoamplifiers, the electrically secure isolation is in accordance with EN 50178 between the mains or motor connections. The electronics signal is achieved with appropriate “creepage” paths and complete potential separation. Further integrated functions offer soft starting, overvoltage detection, short-circuit protection and phase failure monitoring. When Beckhoff motors from the AM227-AM297 series are used with ready-assembled cables, temperature monitoring of the motors is established.
Highly Dynamic, Brushless Power Sources
The synchronous servomotors are brushless, three-phase motors meeting DIN 42950, and have
permanent magnets in the rotor. This high quality neodymium magnetic material makes a
significant contribution to the motors‘ exceptional dynamic properties. A three-phase
winding is housed in the stator, and is electrically powered by the servoamplifier. The
motor commutation is implemented electronically in the servoamplifier.
Temperature sensors in the stator windings and corresponding signal output via a zero-potential (break) contact monitor the coil temperature. The motors normally have an integrated resolver to provide feedback. The AX2000 servoamplifiers evaluate the rotors‘ resolver signals and feed sine-wave currents to the motors.
Power transmission is implemented in accordance with DIN 748 via the cylindrical shaft end with a retaining thread, optional with a feather key groove. The bearings are designed for a service life of 20,000 hours. Biconical collet chucks, coinciding with metal bellows couplings, have proven themselves as excellent, zero backlash coupling elements. The motors accord with insulation material class F according to DIN 57530, and are manufactured to balance quality N according to DIN ISO 2373.
Accessories and options
The motors have angled connectors for the power supply and the resolver signals. Beckhoff
offers the resolver and power leads as a readyassembled accessory. The motors are normally
fitted with two-pole quill shaft resolvers. Optionally the motors (except the AM227) are
also available with integrated single-turn (ECN1313) or multi-turn (EQN 1325) encoders.
The motors are optionally available with an integrated stop brake. This holding brake (24 V DC) locks the rotor when power is removed. When the brake is released, the rotor can turn without residual torque. Operation is free from backlash.
The stop brake can be driven directly by the servoamplifier. The servoamplifier can degauss the brake winding without any additional circuitry. Optionally for the servoamplifiers AX2000 a “personnel safe restart lock” (AS option) is available.