excitation研發(fā)培訓(xùn),設(shè)計(jì)培訓(xùn)(編輯修改稿)
2025-02-25 21:01 本頁(yè)面
【文章內(nèi)容簡(jiǎn)介】 s Ad1 Armature mmf Sine wave whose axis coincides with the pole center Pole Face Design – Magic Field Cq1: If peak of the fundamental is unity, then Cq1 is peak of acutal waveform. Note that Wieseman calls this Aq1 Armature mmf Sine wave whose axis coincides with the gap between poles List of Pole Constants ? Cd1 – Ratio of the fundamental of the airgap flux produced by the direct axis armature current to that which would be produced with a uniform gap equal to the effective gap at the pole center ? Cq1– Ratio of the fundamental of the airgap flux produced by the quadrature axis armature current to that which would be produced with a uniform gap equal to the effective gap at the pole center ? C1 – The ratio of the fundamental to the actual maximum value of the field form when excited by the field only (noload) ? Cm – Ratio of fundamental airgap flux produced by the fundamental of armature mmf to that produced by the field for the same maximum mmf. This is the armature reaction conversion factor for the direct axis. Cm=Cd1/C1 ? K? – Flux distribution coefficient。 the ratio of the area of the actual no load flux wave to the area of its fundamental Pole Constants ? What follows are graphs that relate the physical geometry of the pole to the pole constants. These graphs can be found in the appendix of Engineering Note 106. The graphs in the engineering note are identical to graphs that first appeared in a 1927 AIEE paper titled Graphical Determination of Magic Fields by Robert Wieseman. Pole Constants Wieseman used hand plotting techniques to plot the flux fields of several hundreds of pole shapes to e up with the graphs. Due to the intensive nature of the work, the graphs are plotted for a limited range of pole geometry: Pole arc/Pole pitch = to .75 Gmax/Gmin = to Minimum gap/pole pitch = .005 to .05 Since these curves are used by SMDS to calculate motor performance, SMDS will not run with any one of these three variables outside of the given range. There is no reason, besides the limitations of the original curves, why variables outside the ranges listed above couldn’t be used. Pole Face Design – Magic Fields Determination of K? Pole Face Design – Magic Fields Determination of C1 Pole Face Design – Magic Fields Determination of Cq1 Pole Face Design – Magic Fields Determination of Cd1 Pole Face Design – Magic Fields Pole face designs e in two flavors, single radius and double radius. The reason for this is the shape of the pole head relative to the stator bore radius has a large influence of the shape of the field flux waveform. 11qaaqdaadCTXCTX????????Reactance Calculations Xad = Reactance of armature reaction directed along the direct axis Xaq = Reactance of armature reaction directed along the quadrature axis T = Common Reactance Factor ?a = Permeance Factor Cd1 = Pole Constant Cq1 = Pole Constant PKZfLmT w?????? 82210T = Common Reactance Factor m = phases L = Stator Core Length f= frequency Z = Series Conductors per Phase Kw = Winding factor Stator P = Poles Reactance Calculations m ingKPDga??????a = Permea
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