| 摘要 |
A rotary electric machine includes a stator (10) in which windings are arranged around a plurality of main poles (12b) of a stator core (12), and a hybrid type rotor (20) arranged with an air gap between the stator (10) and the rotor (20) has a step angle for the rotor (20) of about 4.09° and uses metal bearings (42A,42B) for supporting a rotor shaft (22) of the rotor (20). Setting of the step angle for the rotor (20) to be about 4.09° can make a rotation angle of the rotor (20) larger as compared with a conventional motor having a step angle of about 1.8°. With this arrangement, the rotor can be rotated at higher speeds, thereby increasing the motor efficiency. Here, the motor output is at approximately the same level as that of a conventional motor obtained without high air gap precision. Due to this, even if inexpensive slide bearings are used, a high performance can be ensured, resulting in cost reduction. |
