Renesas RA6T2 Application Note page 24

RA6T2
Vector control for permanent magnetic synchronous motor with encoder - AB incremental type encoder
As shown in the Figure 3-2, ratio of the output voltage pulse to the carrier wave is called duty.
Modulation factor "m" is defined as follows.
m: Modulation factor V: Command value voltage E: Inverter bus voltage
A requested control can be performed by setting this modulation factor to the register which determines
PWM duty.
R01AN6208EJ0101 Rev.1.01
Oct 18, 2022
T
ON
× 100 [%]
Duty =
T + T
ON OFF
Figure 3-2 Definition of Duty
V
T
T
OFF
ON
V
m =
E
Average
voltage
t
Page 24 of 71