What is field-oriented control?
Field Oriented Control describes the way in which the control of torque and speed are directly based on the electromagnetic state of the motor, similar to a DC motor. FOC is the first technology to control the “real” motor control variables of torque and flux.
What is stator flux orientation control?
Stator-flux-oriented Indirect Stator-Quantities Control (ISC) is limited only by the physical bounds of available voltage and switching frequency and allows special guidance of the flux trajectory to reach excellent torque performance.
What is an FOC controller?
Vector control, also called field-oriented control (FOC), is a variable-frequency drive (VFD) control method in which the stator currents of a three-phase AC or brushless DC electric motor are identified as two orthogonal components that can be visualized with a vector.
What is FOC in induction motor?
Abstract: Field oriented control (FOC) of induction motor (IM) is commonly used in many variable speed drives. Its implementation requires the motor parameters, which are affected by the saturation of the machine. Therefore, a careful estimation of IM parameters is necessary in order to achieve good drive performance.
What is sensorless field-oriented control?
The FOC algorithm maintains efficiency in a wide range of speeds and takes into consideration torque changes with transient phases by processing a dynamic model of the motor. Among the solutions proposed are ways to eliminate the phase current sensors and use an observer for speed sensorless control.
What is field orientation?
Field orientation: Refers to the direction that displayed or printed graphic characters in a field are intended to be written (e.g., either from left to right, or from right to left).
What is stator flux speed?
see stator flux rotates at a speed Ns=12of1/p with respect to stator and similarly rotor flux rotates at a speed of N=120f2/p , where f2=sf1 and f2 is rotor frequency and also rotor rotates at speed of Nr so that is why rotor flux rotates at a speed of synchronous speed and it is (Nr+N) 2.1K views.
What is rotor flux?
Rotor flux (or flux in general) is a measure of the number of magnetic lines of force being created by the magnetic field in the rotor, and is measured in units of Webers. “Flux density” is obviously the density of these “lines of force”, which is measured in units of flux per area.
What is the difference between DTC and FOC?
FOC uses linear controllers and pulse width modulation (PWM) to control the fundamental components of the load voltage. On the other hand, DTC is a nonlinear strategy that directly generates the voltage vectors in the absence of a modulator. This paper presents a comparative study between the two control schemes.
What is the difference between VF control and vector control?
Vector drives can separately manipulate the voltage and frequency to always produce the optimum V/Hz ratio for maximum torque. In this way, vector drives can generate more starting torque, and can provide full torque down to 1 Hz or less, while V/Hz drives are limited to about 5-6 Hz.
What is FOC in BLDC motor?
Sensorless Field Oriented Control (FOC) is one of the methods used to control a BLDC motor’s speed and torque. Field oriented control (also known as vector control) is a technique used to generate a 3-phase sinusoidal modulation which then can be controlled in frequency and amplitude.
What is orientation field estimation?
Orientation Estimation: The orientation field of a fingerprint image represents the directionality of ridges in the fingerprint image. It plays a very important role in fingerprint image analysis. A number of methods have been proposed to estimate the orientation field of fingerprint images [28].