Motor Control; Motor Types; Motor Identification; Power Loss Ride-Through - ABB ACS580 Firmware Manual

Motor control



Motor types

The drive supports asynchronous AC induction and permanent magnet (PM) motors.
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Motor identification

The performance of vector control is based on an accurate motor model determined
during the motor start-up.
A motor Identification magnetization is automatically performed the first time the start
command is given. During this first start-up, the motor is magnetized at zero speed
for several seconds and the motor and motor cable resistance are measured to allow
the motor model to be created. This identification method is suitable for most
applications.
In demanding applications a separate Identification run (ID run) can be performed.
Settings
99.13 ID run requested
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Power loss ride-through

See section Undervoltage control (power loss ride-through)


Vector control

The switching of the output semiconductors is controlled to achieve the required
stator flux and motor torque. The output frequency is changed only if the actual
torque and stator flux values differ from their reference values by more than the
allowed hysteresis. The reference value for the torque controller comes from the
speed controller or directly from an external torque reference source.
Motor control requires measurement of the DC voltage and two motor phase
currents. Stator flux is calculated by integrating the motor voltage in vector space.
Motor torque is calculated as a cross product of the stator flux and the rotor current.
By utilizing the identified motor model, the stator flux estimate is improved. Actual
motor shaft speed is not needed for the motor control.
The main difference between traditional control and vector control is that torque
control operates at the same time level as the power switch control. There is no
separate voltage and frequency controlled PWM modulator; the output stage
switching is wholly based on the electromagnetic state of the motor.
The best motor control accuracy is achieved by activating a separate motor
identification run (normal ID run).
See also section Speed control performance figures
(page 319)
Program features 95
on page 119.
(page 102).