| 摘要 |
<p>Let (theta0) be the angle formed between the end on the magnetic pole center side of a magnetic flux barrier (22) and the end of an adjacent magnetic flux barrier (22) on the side contacting a rib 23 with respect to the rotor center, f be the oscillation frequency desired to be reduced, Pn be the number of pole pairs, f0 = Pn * N be the electric angle frequency, N be the motor rpm, m = 1, 3, 5,..., and thetar be the angle formed by ribs with respect to the rotor center. The angle is set such that the relation theta0 = 180°* m / (Pn * f / f0), (where, 2 theta0 - thetar < 90°) is satisfied, whereby high efficiency and low noise can be easily made compatible.</p> |
