Rockwell Automation 20G PowerFlex 750-Series AC Drives - Manual (Page 234)

234 Rockwell Automation Publication 750-RM002B-EN-P - September 2013
Chapter 4 Motor Control
PM Flux Vector Control
In flux vector mode, the flux and torque producing currents are independently
controlled and speed is indirectly controlled by a torque reference. Alternatively,
the drive can also control torque instead of speed in flux vector mode. In either
case, this mode can be operated either with or without feedback and will provide
the fastest response to load changes.
High Performance and precise control will require encoder feedback. Refer to the
PowerFlex 750-Series AC Drives Installation Instructions, publication
750-
IN001 , for a list of compatible High Resolution Stegmann encoder and
Heidenhain encoder feedback on the motor.
IPM Flux Vector Control
In IPM Flux Vector mode, the flux and torque producing currents continue to be
independently controlled. Speed is indirectly controlled by a torque reference
output command from the Speed Regulator. Alternatively, the drive can be
configured to control torque instead of speed in flux vector mode. In either case,
for precise control, this mode must be operated with encoder feedback in order
to provide the fastest response to load changes.
The Iq/Id reference calculation block will produce optimum Iq/Id current
reference that will try to establish maximum torque per amp control
performance.
IPM Flux Vector
Torque Ref.
V mag
Voltage
Control
Inverter Motor
Speed
Reg.
Speed Ref.
Current Feedback
High Bandwidth Current Regulator
V ang
Speed Feedback
Torque Ref.
Flux Reg.
Current
Reg.
Encoder
Voltage
Control
Inverter Motor
Speed
Reg.
Speed Freq.
Current Feedback
High Bandwidth Current Regulator
V ang
Speed Feedback
Torque Ref.
Current
Reg.
Encoder
V mag
Iq
Id
Iq/Id
Reference
Calculation