IEEE Power Electronics Magazine - September 2020 - 57

passing through them. The two dc capacitors are connected
in parallel. The detailed wiring procedures are to:
■■Connect the dc bus: TD1-TD3, TD5-TD6, and TE6-Bus■■Connect the dc-bus capacitors: TD5-TD2, TD6-TE1, and
TE2-Bus■■Connect the phase lines: TB6-TB5, and TA6-TA5
■■Connect the dc source: Terminal Bus+ to dc positive, and
Terminal Bus- to dc negative

■■Connect

outputs: TA4 to Phase A, TB4 to Phase B, and
TC4 to Phase C for three-phase PMSM
■■Connect the back EMF measurements: TB4-TA7, and TA4-N
The conventional vector control to regulate the torque or
the speed of an ac motor, as shown in Figure 7, is adopted.
A digital switch Siq is used to select the torque control mode
or the speed control mode. The three-phase motor currents are converted into d-q currents, id and iq, which are

Te∗
id∗ = 0

1
kT

PI
Control

id
ω∗
ω

1
PI
Control

2

iq∗
iq

Siq

PI
Control

ud

uq

PWMs

ua
Inverse-Park
and InverseClarke Transf.

ub
uc

SVPWM
Signals
Generator

IGBT

iα
PARK
Tranf.

iβ

ia
CLARKE
Tranf.
+

Speed
Calculation

ib
θe From QEP

-
Position Offset

FIG 7 Vector control of the PMSM through either torque control or speed control.

6 kHz Noise Filter

6 kHz Noise Filter
Position

Speed (500 rpm/div])
id (1 A /div)
iq (1 A /div)
vab

vca

Control Is Enabled
(a)

Change Current
Reference

(a)
14 kHz Noise Filter

6 kHz Noise Filter
Speed (500 rpm/div])

360 °
145 °

id (1 A /div)
iq (1 A /div)
Control Is Enabled Change Speed
Reference
(b)
(b)
FIG 8 Calibration of the initial rotor position offset through
the back-EMF of a PMSM. (a) Rotor position versus and b)
zoom-in results.

FIG 9 Experimental results of an ac motor drive. (a) Torque
control and (b) speed control.

September 2020

z	IEEE POWER ELECTRONICS MAGAZINE

57



IEEE Power Electronics Magazine - September 2020

Table of Contents for the Digital Edition of IEEE Power Electronics Magazine - September 2020

Contents
IEEE Power Electronics Magazine - September 2020 - Cover1
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