Vector control of a synchronous reluctance motor including saturation and iron loss

Abstract

The application of vector control to a conventional synchronous reluctance motor (VCSynRM) is presented with emphasis on the effects of saturation and iron losses. It is shown experimentally that these parasitic effects can significantly influence the performance of a VCSynRM. A simplified steady-state d-q model including saturation and iron losses is presented, and experimental results concerning optimal torque/ampere and optimal efficiency operation are shown to be in general agreement with the predictions of the model.

Steady-state performance of a line-start synchronous reluctance motor with capacitive assistance

“…The condition for unity-power factor can be established by setting the imaginary part of Z to zero and solving for X c . From (17), this would imply:…”

“…The choice of appropriate capacitor value for a particular machine is made by considering the impedance equation (17) and taking the following conditions:…”

“…The advantage of having a high d-axis reactance is to reduce the magnetizing current and can be achieved by reducing the airgap at pole face but mechanical laws dictate how much this reduction can be made. With appropriate inverter control [17], reluctance motors can be designed without a cage rotor and therefore enables the maximization of the rotor * Tel. : +49 6151 16 5263.…”

Direct Torque Control of Synchronous Reluctance Motor Using Feedback Linearization Including Saturation and Iron Losses

“…The analysis is restricted to the ideal motor, in which saturation and iron losses are ignored. However, the control of the SynRM is highly affected by both magnetic saturation and presence of iron losses [7]. Accurate representation of saturation effects requires detailed knowledge of magnetic behavior in both d and q axes along with cross-saturation at different operating conditions.…”

Control Scheme for Wide-Speed-Range Operation of Synchronous Reluctance Motor in M-T Frame Synchronized with Stator Flux Linkage

“…Maximum torque per ampere (MTPA) control and flux-weakening (FW) control are applied for wide speed range operation. Many methods of achieving such controls have been reported, and these methods are based mainly on a mathematical model of the rotating d-q reference frame that is synchronized with the rotor (1)- (4) . Direct torque control (DTC) can be applied to motor drive systems regardless of the category of motor (5) (6) .…”