| 摘要 |
PURPOSE:To obtain an economical motor at a slight step angle and a high positional precision, by arranging the quantity of the pole teeth of a rotor to be a specified value. CONSTITUTION:So far as a stator is concerned, sixteen stator poles 11-1-11-16 are radially arranged on a ring yoke 11 at an equal pitch, and are organized by arranging a plurality of pole teeth at the tips of the magnetic poles 11-1-11-16. A rotor confronts the pole teeth of the magnetic poles 11-1-11-16 via a space, and is organized with permanent magnets placed between rotor poles 17 provided with pole teeth 18 on the outer periphery of the rotor. The rotor poles 17 are provided with the pole teeth in quantity of Nr respectively, and the respective pole teeth 18 are arranged to be mutually shifted by 180/Nr degrees. The quantity Nr of the rotor poles is arranged as shown in Nr=4+16n, or Nr=12+16n (however, n is a positive integer except zero). As the result, the form of the magnetic poles of the stator is made symmetrical, and positional precision is enhanced at a slight step angle.
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