Analysis of Bridge Currents and UMP of an Induction Machine With Bridge Configured Winding Using Coupled Field and Circuit Modeling

Abstract

Unbalanced magnetic pull (UMP) reduction is an important aspect of high-speed electrical machines and it can be reduced using a specialized winding scheme called bridge configured winding (BCW). A bridge configuration winding has two parallel paths in each phase. The mid points of these two parallel paths can be short-circuited to achieve passive control of the unbalanced magnetic pull (UMP) or a power supply can be added in between these points to achieve active control of UMP. Moreover, it is important to understand the behavior of UMP in different eccentricity conditions for its active suppression. A finite element modeling of bridge configured induction machine has been developed to study the effects of different eccentricity conditions on UMP and bridge currents. A generalized circuit equation has been coupled with the field equation for the implementation of bridge configuration winding. All of the three kinds of eccentricity conditions have been simulated. In addition, two experimental setups have been developed to study the UMP induced vibration and to study the effect of eccentricity on bridge currents. Index Terms-Bridge configured winding (BCW), finite element method (FEM), induction machine, unbalanced magnetic pull (UMP).

Modelling and Analysis of Unbalanced Magnetic Pull in Permanent Magnet Synchronous Machine with Specialized Stator Winding

“…The air gap comprises two layers, with one layer belonging to stator mesh. The air gap stitching approach accommodates the rotor movement and eccentricity [14]. The outermost layer of rotor mesh and upper layer of air gap, which belongs to the stator mesh, are connected by the air gap stitching approach as depicted in Fig.…”

“…Machines with dual sets of winding have poor power ratings. In dual set winding arrangement, the primary winding produces the torque, whereas secondary winding creates lateral force across the air gap [14]. A three phase permanent magnet motor is rewound employing specialized single set of winding arrangement known as bridge configured winding (BCW).…”

Modelling and Analysis of Unbalanced Magnetic Pull in Permanent Magnet Synchronous Machine with Specialized Stator Winding

“…5. This approach requires the stator and rotor mesh to be generated once, significantly reducing the time needed for each step in creating mesh [14], [17].…”

Calculation and Analysis of Unbalanced Magnetic Pull of Rotor under Motor Air Gap Eccentricity Fault

“…et al [11] solved the unbalanced magnetic tension by using the semi analytical and semi numerical harmonic balance time-frequency domain conversion method, and compared the results with those calculated by Runge Kutta method. Kumar Gaurav et al [12] established a finite element model of a bridge induction motor and studied the effects of different eccentricity conditions on UMP and bridge current. Feng W. et al [13] simulated the unbalanced magnetic tension of the radial dynamic eccentric and inclined eccentric rotors by using the semi analytical method, and simulated and analyzed the vibration response of the rotor in the time and frequency domains.…”