Advices

What is flux weakening for high speed operation?

What is flux weakening for high speed operation?

The high speed implies a big electromotive force and requires flux-weakening. Usual control algorithms do flux-weakening by adding negative I d current when the required voltage by the current regulation exceeds the maximum voltage depending on the battery.

What are the disadvantages of PMSM?

Disadvantages of permanent magnet synchronous motor:

  • There is a risk of demagnetization of the poles which may be caused by a large armature current.
  • Extra ampere Cannot be added to reduce the armature reaction.
  • The magnetic field of the PMDC motor is preset at all times, even when the motor is not being used.

What is flux linkage in PMSM?

Rotor magnet flux linkage is critical to monitor the state of the permanent magnet in a permanent magnet synchronous machine (PMSM). This paper proposes a novel online magnet flux-linkage estimation approach by using measured speed harmonics.

What is the flux weakening operation of induction motor?

Flux weakening allows a machine to operate above base speed in constant-power, high speed region when there is a fixed inverter voltage and current [7] . Below rated speed, all of the stator current can be used to produce torque. …

What is field weakening mode control in DC drives?

In the field of closed loop controlled voltage source inverter- fed induction motors the rotor flux oriented control scheme can be regarded as the state of the art for various applications. Field Weakening Mode.

What are the advantages of PMSM motor?

Higher torque and better performance. More reliable and less noisy, than other asynchronous motors. High performance in both high and low speed of operation. Low rotor inertia makes it easy to control.

What is flux in a motor?

Flux: The flow of current through a conductor creates a magnetic field. Flux defines the rate of flow of a property per unit area. Flux current is the rate of current flow through a given conductor cross-sectional area.

What is back EMF in PMSM motor?

The Back-EMF (BEMF) observer represents a solution for sensorless control of Permanent Magnet Synchronous Motor (PMSM) for middle to high speed range. It is a very robust sensorless method for given speed range and it is often used not only in automotive industry but in overall transport systems.

What are the consequences of weakening the field in the DC motor?

Weakening the field current in a shunt connected DC motor reduces the field magnetic flux. The lessened field flux will cause the armature to turn at a greater speed at a given applied armature voltage BUT at a reduced torque.

What is field weakening in Pmsm?

Field-weakening control involves reducing the resulting d-axis flux,λd, by lowering the effect of the resulting air-gap flux linkage associated with the permanent magnets,λpm. This is done by driving the component of the magnetizing d-axis stator current negative in the PMSM as shown in Figure 1 below. Fig.

What are advantages and disadvantages of PMSM?

The Permanent magnet synchronous motor has not any brushes so it has a low maintenance cost. But it needs to high initial cost. It has only stator winding and no brushes so its heat generation is low compared with brush motor. It may offer a smaller size for more compact mechanical packages.

Is PMSM and BLDC same?

Both these machines are very similar, except that the BLDC has a trapezoidal back EMF, while the PMSM has a sinusoidal back EMF. BLDC motors are commonly used in designs that require cost-effective solutions, due to their low cost of manufacturing [7] . …

How do you increase the magnetic flux of a motor?

The Motor Effect To increase the force on the wire you can: increase the current. increase the magnetic field strength. ensure the current is exactly perpendicular to the magnetic field lines.

How is flux related to torque?

For all electric motors, flux and torque are linked together. Torque is proportional to flux and current. The electrical equivalency can only be determined by analysis of the motor design with the aid of equivalent circuits.

How is back emf calculated in Pmsm?

The relationship between the peak permanent magnet flux linkage and the back EMF is: k e = N ψ m . The back EMF, eph, for one phase is: e p h = k e ω .

What is the advantage of back emf?

The drivingtorque increases the speed of the motor which also increases their back emf. The high value of back emf decreases thearmature current. The small magnitude of armature current develops less driving torque, which is equal to the loadtorque. And the motor will rotate uniformly at the new speed.

Is there a special flux-weakening algorithm for IPM motors driven by inverters?

In Chapter 4 of this thesis, a special flux-weakening algorithm was developed 93 for IPM motors driven by Z-source inverters, namely, the boosted-voltage flux-

Is the flux-weakening control method based on Z-source inverters valid?

Simulation results of a motor-drive system model based on Z-source inverters were presented to verify the validity of the presented flux-weakening control method. In this thesis, a new approach for flux-weakening control, which is the boosted-

Can boosted voltage flux-weakening control be used at high speeds?

voltage flux-weakening control at high speeds. Simulation results of a motor-drive system model based on Z-source inverters were presented to verify the validity of the presented flux-weakening control method. In this thesis, a new approach for flux-weakening control, which is the boosted-

Can ZSIS be used for the Fw control of ipmsms?

Figure 4.1: Typical characteristic curves of torque/power vs. speed of IPMSMs. In this chapter, a new approach utilizing ZSIs for the FW control is presented. Due to the voltage boost capability of ZSIs, a new FW control algorithm is developed