scholarly journals Innovative (New Teaching Technique) Computer Simulation Of Rotating Magnetic Fields In Three Phase Induction Motors Using Matlab Animation.

2020 ◽  
Author(s):  
Bruno Osorno
Keyword(s):  
Computer Simulation ◽  
Magnetic Fields ◽  
Induction Motors ◽  
Rotating Magnetic Fields ◽  
Three Phase ◽  
Teaching Technique

Rheology and Behavior of Magnetic Fluids in Alternating/Rotating Magnetic Fields

2003 ◽  
Author(s):  
Carlos Rinaldi ◽  
Xiaowei He ◽  
Adam Rosenthal ◽  
Thomas Franklin ◽  
Cory Lorenz ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Magnetic Fluids ◽  
Rotating Magnetic Fields ◽  
Magnetic Field Rotation ◽  
Three Phase ◽  
Field Rotation ◽  
And Behavior ◽  
The Magnetic Field ◽  
Cylindrical Test

The rheology and behavior of magnetic fluids in the presence of time-varying magnetic fields is illustrated through three sets of experiments. The first involves measurements of ferrofluid torque on a cylindrical spindle under applied uniform rotating magnetic fields. We measure the torque required to restrain a stationary cylindrical test wall in contact with aqueous ferrofluids subjected to the rotating uniform magnetic field generated by a three-phase AC 2-pole motor stator winding. The torque is found to scale linearly with volume, and to be a function of the applied magnetic field amplitude, frequency and direction of rotation. Measurements show that for ferrofluid entirely inside the cylindrical test wall the torque points in the same direction as the magnetic field rotation pseudovector, whereas for ferrofluid entirely outside the cylindrical wall the torque points in the direction opposite to the field rotation pseudovector. The second set of experiments explores the formation of ordered ferrofluid structures in the gap of a Hele-Shaw cell subjected to simultaneous vertical DC and in-plane horizontal rotating magnetic fields. Finally, the third set of experiments illustrates the effect of applied DC fields on the shape of ferrofluid jets and sheets.

Ferrohydrodynamics in Time-Varying Magnetic Fields

2002 ◽  
Author(s):  
Carlos Rinaldi ◽  
June-Ho Lee ◽  
Adam D. Rosenthal ◽  
Thomas Franklin ◽  
Markus Zahn
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Outer Wall ◽  
Anomalous Behavior ◽  
Rotating Magnetic Fields ◽  
Free Surfaces ◽  
Couette Viscometer ◽  
Three Phase ◽  
Viscous Torque ◽  
Theoretical Analyses

Measurements of magnetic-field-induced ferrofluid flow and torque in uniform rotating magnetic fields are presented and compared to theoretical analyses in order to understand observed paradoxical behavior. The viscous torque from this fluid flow is measured using a cylindrical Couette viscometer, as a function of magnetic field amplitude, frequency, and direction of rotation. The first set of experiments measures the torque on the outer wall of a polycarbonate spindle that is attached to a viscometer, which functions as a torque meter. The spindle is immersed in the ferrofluid, which is centered in the gap of a three-phase AC 2-pole motor stator winding. Anomalous behavior, such as negative effective viscosity, is demonstrated and discussed. The second set of experiments measures the viscous torque on the inner wall of a hollow spindle attached to the torque meter and filled completely with ferrofluid so that there is no free surface. These measurements show that magnetic fluid effects arise even in the absence of free surfaces. These observations are then shown to agree with a recently derived analysis of spin-up flow in ferrofluids.

Torque Measurements in Spin-Up Flow of Ferrofluids

2004 ◽  
Vol 126 (2) ◽  
pp. 198-205 ◽  
Author(s):  
Adam D. Rosenthal ◽  
Carlos Rinaldi ◽  
Thomas Franklin ◽  
Markus Zahn
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Stator Winding ◽  
Time Varying ◽  
Rotating Magnetic Fields ◽  
Free Surfaces ◽  
Torque Measurements ◽  
Three Phase ◽  
Viscous Torque ◽  
Theoretical Analyses

Measurements of magnetic-field-induced torque in applied uniform rotating magnetic fields are presented and compared to theoretical analyses for water- and oil-based ferrofluids. These experiments measure the viscous torque on the inner wall of a stationary hollow polycarbonate spindle that is completely filled with ferrofluid and attached to a viscometer functioning as a torque meter. The spindle remains stationary and is centered inside a three-phase AC 2-pole motor stator winding, creating uniform time-varying rotating magnetic fields. The viscous torque is measured as a function of magnetic field amplitude, frequency, and direction of rotation. These measurements demonstrate that ferrofluid flow and torque are present even in the absence of free surfaces and agree with a recently derived analysis of the torque during spin-up flow of ferrofluids.

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