Steady-state performance analysis of permanent magnet synchronous motors including space harmonics

Steady-State and Transient Performance Analysis of Permanent-Magnet Machines Using Time-Stepping Finite Element Technique

“…Moreover, it has been found that the agreement between computed and measured results of the starting performance characteristics in the IPM motor is good [3]. Therefore, it is considered that design use of the kc is acceptable, even if the higher space harmonics exists [5]. The value of coefficient kc is 0.55 in this paper.…”

“…ea, eb, and ec are the induced phase voltages; and ea is given by the line integral of the vector potential round ca which is along the stator windings of phase a where A t is A at time t. t is the time step. eb, and ec can be obtained similarly, as in [5]. …”

“…It is used to determine the suitable value of the t. This value must be determined by taking into account the effects due to the space harmonics [5]. The space harmonics effect is also the source of the cogging and ripple torques in the IPM motor.…”

“…One can obtain the vector potential, currents by assuming a constant speed and then solving (1), (31)-(33) using the time-stepping finite-element technique [5].…”

“…Time-stepping finite element analysis has been used to successfully predict the dynamic and transient performances of the prototype machines. Time-stepping finite element analysis [3][4][5][6] has been used to successfully predict the dynamic and transient performances of the prototype IPM machines. The computed performance has been validated by tests in the prototype machine.…”