| 摘要 |
A synchronous permanent magnet machine including a permanent magnet arrangement for producing a magnetic field having a flux density distribution that is approximately sinusoidal, the permanent magnet arrangement including a permanent magnet pole (11a, 11b, 21a, 21b, 23a, 23b, 27a, 27b, 28a, 28b) having a base (14a, 14b), top face (15a, 15b), sides (16a, 16b, 16c, 16d), and a central region midway between the sides (16a, 16b, 16c, 16d) and extending between the base (14a, 14b) and top face (15a, 15b), the permanent magnet pole (11a, 11b, 21a, 21b, 23a, 23b, 27a, 27b, 28a, 28b) being made up of both low and high energy-product magnets (3a, 3c, 12a, 12b, 13a, 13b, 13c, 13d, 19a, 19b, 19c, 22a, 22b, 22c, 24a, 24b, 25a, 25b, 26a, 26b) characterised in that (i) the permanent magnet pole (11a, 11b, 21a, 21b, 23a, 23b, 27a, 27b, 28a, 28b) includes a low energy-product magnet (13a, 13b, 13c, 13d, 19a, 19b, 19c, 22a, 22b, 22c, 26a, 26b) and a high energy-product magnet (12a, 12b, 25a, 25b) that have different directions of magnetisation, and/or (ii) the disposition of low/high energy-product magnets (3a, 3c, 13a, 13c, 24a, 24b, 25a, 25b, 26a, 26b) within the permanent magnet pole (27a, 27b, 28a, 28b) is asymmetric with respect to the central region of the permanent magnet pole (27a, 27b, 28a, 28b). |
