Dynamic operation of FOC induction machines under current and voltage constraints

Dynamic Response of FOC Induction Motors Using MTPA Considering Voltage Constraints

“…The torque equation of the induction is given in (1). In steady state, the equation can be rewritten as a function of the d-and q-axis currents (2).…”

“…Since the dynamics of torque will be limited during remagnetization process, torque can be profiled to achieve two targets: minimize the settling time, which is achieved by using all the available current during the whole transient, and minimize the jerk and consequently the stress of the mechanical transmission, which is achieved by following a ramp for the torque command. Discussion of this strategy can be found in [1].…”

A current sensor fault diagnosis method based on phase angle shift technique applying to induction motor drive

“…One of the typical vector control techniques is the field-oriented control (FOC) method, which can precisely control flux and moment based on the stator current separation technique [6]. Based on the control method of the separately excited direct current DC motor, the stator current vector is separated into two perpendicular components in the rotation coordinate system [xy], whose x-axis is the axis corresponding to the rotor flux [7]- [9]. The current component on the x-axis is used to maintain the rotor flux as a constant during operation.…”

“…Magnetic current "im," synchronous speed "ωe," rotor flux angle "γ" are calculated through the IM current model. The stator current components in stationary coordinate[αβ] are converted into rotating coordinate [dq] corresponding to the rotor axis, as(7).…”

A field-oriented control (FOC) method using the virtual currents for the induction motor drive

“…The three-phase stator current in the FOC technique is divided into two orthogonal components, including "isx" and "isy" in the [x, y] rotating coordinate system, as in Figure 1. The "isx" component is used to keep the rotor flux as a constant value, and the "isy" component is applied to adjust the IM's torque [8]- [14]. Therefore the stator current plays a crucial role in the speed control of the FOC technique.…”