Carrier signal based sensorless control of electrically excited synchronous machines at standstill and low speed using the rotor winding as a receiver

Wound Synchronous Machine Sensorless Control Based on Signal Injection into the Rotor Winding

“…Rambetius et al studied the WSM model by incorporating the effects of the field winding into the stator. For signal injection into the stator, the following inductances should be used [25]:…”

“…where L dq = L qd is assumed, L l f is the leakage inductance of field, and L ddt , L qqt , and L dqt are substituted for L dd , L qq , and L dq , respectively. Please note that L ddt ≤ L dd and L qqt ≤ L qq , because the field coil acts as a damper winding and reduces the high-frequency component [25]. The angle error is estimated by…”

“…Amit et al [23] used a flux observer in the stator flux coordinate. Recently, the sensorless signal injection for WSM was published, whose carrier signal is injected to an estimated d-axis, and the response in estimated q-axis current [24,25]. Griffo et al [24] applied a signal-injection method to a WSM to start an aircraft engine, and presented full-torque operation from zero to a high speed.…”

“…Griffo et al [24] applied a signal-injection method to a WSM to start an aircraft engine, and presented full-torque operation from zero to a high speed. Rambetius et al [25] compared two detection methods when a signal was injected into the stator winding: one from a stator winding and the other from the field (rotor) winding.…”

Initial rotor position estimation method for aircraft wound‐rotor synchronous starter/generators

“…In this approach, the saliency is not necessary and the 180° ambiguity, a common issue in the initial rotor position estimation for the PMSM, can be eliminated easily. On the basis of this approach, several methods have been provided in [13–15]. However, the structure of the three‐stage WSSG cannot meet the prerequisite, a direct access to the field winding of the MG, of these methods.…”