ABB DLM02 Analog module industrial system controller

Description

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To emulate the magnetic operating conditions of a DC motor,
ie, to perform the field orientation process, the flux-vector drive
needs to know the spatial angular position of the rotor flux inside
the AC induction motor.
With flux vector PWM drives, field orientation is achieved by electronic means rather than the mechanical commutator/brush
assembly of the DC motor.
Firstly, information about the rotor status is obtained by feeding back
rotor speed and angular position relative to the stator field by
means of a pulse encoder. A drive that uses speed encoders is
referred to as a “closed-loop drive”.
Also the motor’s electrical characteristics are mathematically
modelled with microprocessors used to process the data.
The electronic controller of a flux-vector drive creates electrical
quantities such as voltage, current and frequency, which are the
controlling variables, and feeds these through a modulator to the
AC induction motor. Torque, therefore, is controlled INDIRECTLY.
Advantages
– Good torque response
– Accurate speed control
– Full torque at zero speed
– Performance approaching DC drive
Flux vector control achieves full torque at zero speed, giving it
a performance very close to that of a DC drive.
Drawbacks
– Feedback is needed
– Costly
– Modulator needed
To achieve a high level of torque response and speed accuracy, a
feedback device is required. This can be costly and also adds
complexity to the traditional simple AC induction motor.
Also, a modulator is used, which slows down communication
between the incoming voltage and frequency signals and the need
for the motor to respond to this changing signal.
Although the motor is mechanically simple, the drive is electrically complex.