Modified PWM Direct Instantaneous Torque Control System for SRM

Table 1

Scheme of the modified PWM-DITC.

Status of sampling or error	Single-phase conduction	Two-phase commutation
Conduction of torque		Outgoing	Incoming
Terr ≥ Tm+	Tsam = Tm+	1 (hysteresis zone)
Terr ≤ Tm−	Tsam = Tm−	−1 (hysteresis zone)
Tm+ > Terr > Tm−	Tm+ ≥ Tsam ≥ 0	Natural sampling (PWM zone)
	Terr < 0	0 (buffering zone)
	0 ≥ Tsam ≥ Tm−	Natural sampling (PWM zone)	0
	Terr > 0	0 (buffering zone)