Vector Control - ABB ACQ580 Firmware Manual

IR compensation for scalar motor control
IR compensation (also known as
voltage boost) is available only when
the motor control mode is scalar. When
IR compensation is activated, the drive
gives an extra voltage boost to the
motor at low speeds. IR compensation
is useful in applications, such as
positive displacement pumps, that
require a high break-away torque.
In vector control, no IR compensation is
possible or needed as it is applied automatically.
Settings
• Menu - Primary settings - Motor - IR compensation
• Parameters 97.13 IR compensation
(page 293)
• Parameter group


Vector control

Vector control is the motor control mode that is intended for applications where high
control accuracy is needed. It offers better control over whole speed range, in
particular in applications where slow speed with high torque is needed. It requires an
identification run at startup. Vector control cannot be used in all applications, eg when
sine filters are being used or there are multiple motors connected to single drive.
The switching of the output semiconductors is controlled to achieve the required
stator flux and motor torque. The reference value for the torque controller comes from
the speed controller.
Stator flux is calculated by integrating the motor voltage in vector space. Rotor flux
can be calculated from stator flux and the motor model.Motor torque is produced by
controlling current 90 degrees from the rotor flux.By utilizing the identified motor
model, the rotor flux estimate is improved. Actual motor shaft speed is not needed for
the motor control.
See also section DC voltage control
Settings
• Menu - Primary settings - Motor - Control mode
• Parameters 99.04 Motor control mode
(page 295).
28 Frequency reference chain
(page 80).
Motor voltage
IR compensation
No compensation
(page 290) and 99.04 Motor control mode
(page 167).
(page 293) and
Program features 73
99.13 ID run requested
f (Hz)