ABB DLM01 Analog module industrial system controller

Description

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A DC machine is able to produce a torque that is:
– Direct – the motor torque is proportional to the armture
current: the torque can thus be controlled directly and
accurately.
– Rapid – torque control is fast; the drive system can have
a very high dynamic speed response. Torque can be
changed instantaneously if the motor is fed from an ideal
current source. A voltage fed drive still has a fast
response, since this is determined only by the rotor’s
electrical time constant (ie, the total inductance and
resistance in the armature circuit)
– Simple – field orientation is achieved using a simple
mechanical device called a commutator/brush assembly.
Hence, there is no need for complex electronic control
circuitry, which would increase the cost of the motor
controller.
Drawbacks
– Reduced motor reliability
– Regular maintenance
– Motor costly to purchase
– Needs encoder for feedback
The main drawback of this technique is the reduced reliability
of the DC motor; the fact that brushes and commutators wear
down and need regular servicing; that DC motors can be costly
to purchase; and that they require encoders for speed and position feedback.
While a DC drive produces an easily controlled torque from zero
to base speed and beyond, the motor’s mechanics are more
complex and require regular maintenance.
AC drives – introduction
– Small size
– Robust
– Simple in design
– Light and compact
– Low maintenance
– Low cost
The evolution of AC variable speed drive technology has been
partly driven by the desire to emulate the performance of the
DC drive, such as fast torque response and speed accuracy,
while utilising the advantages offered by the standard AC motor.