What is the torque function of permanent magnet synchronous machine?

Let’s start with some basic FOC principles. A reactance torque of PMSM is generated by an interaction of two magnetic fields (one on the stator and one on the rotor). The stator magnetic field is represented by the magnetic flux/stator current.

What is direct torque control of induction motor?

Direct torque control (DTC) is an emerging technique for controlling PWM inverter-fed induction motor (IM) drives. It allows the precise and quick control of the IM flux and torque without calling for complex control algorithms. In principle, moreover, it requires only the knowledge of the stator resistance.

What is meant by direct torque control?

Direct torque control (DTC) is one method used in variable-frequency drives to control the torque (and thus finally the speed) of three-phase AC electric motors. This involves calculating an estimate of the motor’s magnetic flux and torque based on the measured voltage and current of the motor.

What is vector control of permanent magnet synchronous motor?

Vector control is an elegant method of controlling the permanent magnet synchronous motor (PMSM), where field-oriented theory is used to control space vectors of magnetic flux, current, and voltage. This vector control technique was developed to achieve the same excellent, dynamic performance of the PMSM.

What is the difference in permanent magnet synchronous motor and synchronous motor?

The permanent magnet synchronous motor construction is similar to the basic synchronous motor, but the only difference is with the rotor. The rotor doesn’t have any field winding, but the permanent magnets are used to create field poles.

How does permanent magnet synchronous reluctance motor work?

Synchronous reluctance motors are designed to run at exact, “synchronous” speeds. They accomplish this by using a three-phase stator winding (producing a true RMF) and a rotor which implements salient rotor poles and internal magnetic flux barriers (usually notches or air gaps within the rotor, see Figure 1).

What is the torque control?

A control method that enables the torque generated by a motor to be equal to a torque reference input. Torque control is suitable for tension control of a winding machine and other applications.

What is the basic principle of direct torque control method?

Direct Torque Control (DTC) is an optimised AC drives control principle where inverter switching directly controls the motor variables: flux and torque. The measured input values to the DTC control are motor current and voltage. The voltage is defined from the DC-bus voltage and inverter switch positions.

What is vector control of synchronous motor?

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.

How do permanent magnet synchronous motors work?

A permanent-magnet synchronous motor (PMSM) uses permanent magnets embedded in the steel rotor to create a constant magnetic field. The stator carries windings connected to an AC supply to produce a rotating magnetic field (as in an asynchronous motor).

How are permanent magnet synchronous motors started?

Permanent Magnet Synchronous Motor Theory It is a 3-phase AC synchronous motor that runs at synchronous speed with the applied AC source. Instead of using winding for the rotor, permanent magnets are mounted to create a rotating magnetic field. The 3-phase input ac supply is given to the stator to start working.

How torque is produced in SRM?

When the SRM is working at low speeds and current hysteresis control may be applied, at the beginning of the conduction period, the inductance value is almost constant, and consequently, a small amount of torque is produced. The magnetic flux linkage rise is constant because of the quazi-linear inductance variation.