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Sensorless and torque control of Switched Reluctance Motors (SRMs) is a well-researched field. Many techniques rely on the measurement of phase inductance and or flux-linkage which can be significantly affected by the mutual phase inductance. By measuring the mutual inductance over an electrical cycle or at particular locations, the accuracy of the sensorless and torque control techniques can be improved...
Variable flux machines use low coercive-force magnets to control the air-gap flux density. The magnet flux is controlled by applying direct-axis armature current pulses. The magnetization state of the magnets depends on the peak value of the direct-axis current. Any overshoot in the direct-axis current adversely affects the magnetization state. As the controller parameters are dependent on the inductance...
Precise knowledge of machine inductances are essential in the design of controllers with adequate dynamic and steady-state performance, for concentrated-wound interior permanent magnet machines. These machines have a relatively low base speed; therefore, their high-speed operation in the field-weakening mode requires the stator windings to be excited above the rated frequency. The effect of the current...
The performance of a permanent magnet synchronous motor (PMSM) drive highly depends on the machine parameters such as resistance, inductance and back-emf constant. The accurate knowledge of these parameters is of specific interest in the case of direct torque control method (feed forward control) and sensor-less control. The knowledge of the machine inductance always poses some extra degrees of challenge...
Inductance parameter of SRM is measured by traditional volt-ampere method, and the result is validated by using FEM. We also deduce characteristic of flux linkage and electromagnetic torque from the above two methods. The chapter offers the foundation for modeling accurately and control high performance.
This paper investigates the nonlinear model of the permanent magnet synchronous machines (PMSMs). In order to incorporate the structural and saturation saliencies, two parameters are defined to indicate the saturation ratios. An analytical model is derived and the inductance matrix is expressed in both stationary and rotating reference frames, respectively. An incremental inductance measure system...
An improved AC standstill inductance measurement method for interior permanent magnet synchronous machine (IPMSM) is proposed in this paper. Only the 3-phase voltage source, oscilloscope, and DC voltage source are required, rather than the dynamometer and inverter in the other methods. Depending on the deduced q- and d-axis voltage equations in the stationary reference frame, the q- and d-axis inductances...
An improved AC standstill inductance measurement method for interior permanent magnet synchronous machine (IPMSM) is proposed in this paper. Only the 3-phase voltage source, oscilloscope, and DC voltage source are required in this method, rather than the dynamometer and vector controller in the other methods. Depending on the derivative q- and d-axis voltage equations in the stationary reference frame,...
This paper describes a method to operate a switched reluctance machine (SRM) sensorless with a precise position estimation but without the necessity of a prior known machine characteristic. When a machine is connected to the inverter for the first time, an initialization sequence is started to determine the inductance profile of the machine automatically. Within this sequence the machine is started...
The conventional method of measuring inductance involves using an RLC meter. Such a measurement method has limited accuracy due to the interference of back-electromotive force during rotation. Profiling of the inductance at various motor positions thus requires cumbersome mechanical locking of the rotor. In this paper, an elegant method is introduced to capture the inductance profile of a spindle...
Accurate knowledge of the high frequency inductance profile plays an important role in many designs of sensorless controllers for surface inductance. A special algorithm is used to decouple the cross-coupling effects between the d-axis and the q-axis, which allows mounted permanent magnet (SMPM) synchronous motors. This paper presents an AC+DC measurement method for determination of the d-axis and...
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