UM0324 datasheet(59/105 Pages) STMICROELECTRONICS

59 / 105 page

UM0324

Library functions

59/105

Figure 37.

Rotor flux angle calculation (tachogenerator)

IFOC_CalcFluxTorqueRef

Synopsis

void IFOC_CalcFluxTorqueRef (void)

Description

This function provides current components iqs* and ids* to be used

as reference values (by the IFOC_Model function) in closed-loop

speed mode (see “Torque & Flux opt” block in Figure 38).

Speed setpoint and actual rotor speed

ωr are compared in a PID

control loop, whose output is iqs**. This component, together with

the previous flux reference and the rotor speed

ωr, is used to work

out the stator frequency that has to be generated. With this

information, two lookup-tables (described in MC_ACmotor_prm,

Section 2.2.5 , defined by taking into account the field weakening

strategy explained in Section 4.4.4) are run through, in order to get

the optimal flux reference (ids*) and the saturation value of the

torque current component (iqs max) that allow to reach the desired

speed (under the obvious limitations of rated torque and rated

power).

Input

None.

Returns

None.

Functions called

PID_Speed_Regulator;

mul_q15_q15_q31, div_q31_q15_q15.

UM0324 Datasheet(PDF) 59 Page - STMicroelectronics