What is flux weakening?
Flux weakening uses stator current components to counter the fixed-amplitude magnetic airgap flux generated by the rotor magnets, performing a role similar to field weakening in a separately excited dc motor.
What is flux weakening of PMSM?
Flux-weakening control of interior permanent magnet synchronous motor (PMSM) is elaborated by presentation of current limit trajectory, speed limit trajectory and load angel limit trajectory. Flux-weakening control extends the timing range of the motor.
What is field weakening control?
Field-weakening or flux-weakening is a technique for increasing the speed of an electric motor above its rating at the expense of reduced torque. This behavior occurs in the constant torque region of the PMSM, where field-oriented control (FOC) is an accepted way to regulate the motor.
What is flux weakening in induction motor?
Abstract: Flux-weakening control for induction motor (IM) in voltage extension region (outside the inscribed circle but in the hexagon) is meaningful to yield a further maximum torque. However, as the voltage-limit trajectory migrates out of the inscribed circle, torque ripple becomes more severe.
How is field weakening done?
Here’s how field weakening is achieved: The d-axis of the stator current is referenced to, or in-line with, the axis of the rotor’s magnetic flux. But back EMF is created by rotor flux. So adding negative d-axis current reduces the rotor flux, which means that back EMF is also reduced.
How is flux weakening related to base speed?
At sinusoidal steady-state and high speed, voltage vector magnitude is mainly related to the induced voltage (derivative of flux), while the contribution of resistive voltage drop is negligible. To keep control above the base speed, a stator flux reduction is imposed (“flux-weakening” or “field-weakening”).
Which is the best citation for flux weakening?
Recommended Citation Li, Muyang, “Flux-Weakening Control for Permanent-Magnet Synchronous Motors Based on Z-Source Inverters” (2014). Master’s
What does it mean to reduce flux in a stator?
To keep control above the base speed, a stator flux reduction is imposed (“flux-weakening” or “field-weakening”). Although this can result in a lower torque output, it allows to maintain the current control, since the voltage vector resulting from current regulation can be kept within the magnitude limit.
Which is flux weakening control for permanent magnet synchronous motors?
FLUX-WEAKENING CONTROL FOR PERMANENT-MAGNET SYNCHRONOUS MOTORSBASED ON Z-SOURCE INVERTERS Muyang Li Marquette University, 2014 Permanent magnet synchronous machines (PMSMs) have high efficiency, high power density, high torque-to-inertia ratio, and fast dynamic response.