ElmoMC SimplIQ Software Manual - Manual (Page 124)

SimplIQ Software Manual
MAN-SIMSW (Ver. 1.4)
9-1
Chapter 9: The Current Controller
This chapter describes the current controller and its parameterization. Also included are
a description of the current limiting process and the drive protections.
The commands relevant to the current controller are:
Command Description
TS Current controller sampling time
KP[1] Proportional gain of current controller (nominal voltage)
KI[1] Integral gain of current controller (nominal voltage)
XP[4] Time constant for DC power bus filter
XP[5] Step limiter for torque command filter
XP[6] Time constant for torque command filter
MC Largest available drive current
PL[1] Application peak current limit
PL[2] Duration for peak current limit
CL[1] Continuous application current limit
Each of these commands is described fully in the SimplIQ Command Reference Manual.
This chapter deals with currents measured in amperes. The definition of ampere
used for three-phased motor current is explained in section 2.3 of this manual.
SimplIQ drives energize all three motor terminals simultaneously. This means that it must
control two current components simultaneously, because the phase currents are linearly
dependent (the sum of all phase currents is zero). The
SimplIQ drive’s vector current
controller directly controls the following two current components:
ƒ
IQ: current component that produces a magnetic field in the desired direction
(normally perpendicular to the rotor fixed magnet field)
ƒ ID: current component that produces a magnetic field orthogonal to the desired
direction (normally parallel to the rotor fixed magnet field)
The following diagram describes the structure of the current controller: