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Purpose and Learning Objectives. The purpose of this presentation is to provide industry professionals with an overview of the basic concepts and relationships between airflow and pressure, and how these concepts are affected by various outside factors in regard to fans.
· Calculate air velocity as a function of air flow and cross section; · Calculate local C-coefficients for each fitting used; and · Calculate pressure loss using the friction chart. The following is a simple example of how duct pressure accumulates and is totaled in a section.
9 Μαΐ 2020 · The first law of fans is a useful tool when working out the volumetric flow rate supplied by a fan under speed control or conversely working out what the RPM would be to deliver a required volume of air and hence what frequency to set a variable speed drive (VSD) to.
The stator voltage equations of the IPM are [31] where va , vb, vc are the a,b,c stator terminal voltages , λa, λb,λc are the flux linkages in the abc plane, i a, ib,ic are the abc stator currents, and r 1 is the stator resistance of each phase + i r, dt d v = + i r dt d v = + i r dt d v = c c c 1 b b b 1 a a a 1 λ λ λ (2.1)
4 Αυγ 2020 · A general analytical model, which is applied to pre-estimate the air-gap magnetic field of interior permanent magnet synchronous motors (IPMSM) under the no-load and load conditions, is proposed in this study.
25 Μαΐ 2021 · div>This paper proposes an analytical model to calculate the airgap function and inductance, which can be used to get an optimal design during the initial design phase. It investigates the...
Abstract— The permanent magnet synchronous motors (PMSM) became more plausible being used in traction applications due to their high torque to weight ratio properties and extensive flux weakening properties to extend the constant power region to obtain maximum speed of PMSM drives.
