ABB DO810 Analog module industrial system controller

Description

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When combined to form a DTC drive, the above features produce a drive capable of calculating the ideal switching voltages
40,000 times every second. It is fast enough to control individual
switching pulses. Quite simply, it is the fastest ever achieved.
Once every 25 microseconds, the inverter’s semiconductors
are supplied with an optimum switching pattern to produce the
required torque. This update rate is substantially less than any
time constants in the motor. Thus, the motor is now the limiting
component, not the inverter.
What is the difference between DTC and other sensorless drives on the
market?
There are vast differences between DTC and many of the sensorless drives. But the main difference is that DTC provides accurate
control even at low speeds and down to zero speed without
encoder feedback. At low frequencies the nominal torque step
can be increased in less than 1ms. This is the best available.
How does a DTC drive achieve the performance of a servo drive?
Quite simply because the motor is now the limit of performance
and not the drive itself. A typical dynamic speed accuracy for
a servo drive is 0.1%s. A DTC drive can reach this dynamic
accuracy with the optional speed feedback from a tachometer.
How does DTC achieve these major improvements over traditional
technology?
The most striking difference is the sheer speed by which DTC
operates. As mentioned above, the torque response is the
quickest available.
To achieve a fast torque loop, ABB has utilised the latest high
speed signal processing technology and spent 100 man years
developing the highly advanced motor model which precisely
simulates the actual motor parameters within the controller.