Variable-Pole Induction Machine Drive for Electric Vehicles

FEM-based Parameter Estimation for a Variable Phase-Pole Induction Machine

“…As mentioned in [9,15], the 123 fundamental reference frame unifies the machine for all configurations. However, since the base cases make use of mechanical instead of electrical angles, the transformation matrix T abc→123 depends on the pole-pair number p. Exemplary, the transformation matrices for p = {1, 2} are given in (8). Here, I m is a unity matrix and 0 a zero matrix of rank m.…”

“…In order to decrease the high current ratings of the ISCAD, the wound independently controlled statorcoils machine (WICSC machine) with Gramme-type winding is proposed in [7]. A similar machine is conceived in [8].…”

Winding Layout Considerations for Variable-Pole Induction Motors in Electric Vehicles

“…Electronic pole reconfiguration requires a stator winding layout with increased winding accessibility. Several stator winding design approaches have been investigated in the literature for variable-pole IMs [10], [11], [13]- [22] and typical examples are shown in Fig. 2.…”

“…Refs. [7], [10]- [13] used toroidal windings (Gramme windings) to help achieve a wide set of pole counts through independent current control of each coil based on the number of inverter legs. For example, a 36slot machine driven by an 18-leg converter can be reconfigured to six-, four-, and two-pole count [11].…”

“…Thus, an open question remains: How do these winding options compare in terms of torque Fig. 2: Possible winding configurations for achieving variable-pole operation: (a) toroidal winding that can reconfigure to six-, fourand two-pole operation [10]- [13], (b) distributed single-layer winding designed for pmin = 2 that can reconfigure to six-and two-pole operation [14], [18]- [20], (c) double-layer winding with 20 • pitch angle [21], [23], and (d) double-layer version with 120 • phase belt designed at pmax = 4 that can reconfigure to two-pole operation [15]- [17]. production, efficiency, power density and torque speed envelop in a variable-pole design space?…”