| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a cogging torque and a impulse torque in a combined torque outputted from the common output shaft, by disposing in the multiple stages, a plurality of permanent magnet motor portions in the axial direction. SOLUTION: A permanent magnet motor portion 2A is composed of a stator 3 including Z grooves 6, each of which is provided with a coil 7, and a rotor 11 in which a plurality of permanent magnets 12 are embedded to the external circumferential surface. In this case, n (n is an integer 2 or larger) motor portions 2A, 2B, and so on disposed in a line in the axial direction and are accommodated within only one housing 10. With the position of the stator 3A of a certain first motor portion 2A defined as the reference position, the mounting positions of the stators 3B, 3C,..., 3n of the second, third,..., n-th motor portions 2B, 2C,..., 2n are respectively determined sequentially with displacement, using the formulaθn=(360 deg.÷Z÷N)×(n-1) (where,θn is the mounting position of the n-th stator).
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