Stepping motor with detent torque elimination
AssigneeOriental Motor Co., Ltd.
InventorMasaru Kobori
Life of this patent
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Abstract
A stepping motor forms the teeth of the stator so that each have a predetermined pitch in order to eliminate the detent torque. In a stepping motor in which P stator salient poles 1.sub.1, 1.sub.2, . . . 1.sub.p are disposed and, on the surface of each stator salient pole opposed to a rotor 2 whose teeth 4 are disposed at equal pitches .tau..sub.R, k stator teeth 3 are each disposed at equal pitches .tau..sub.S. The stator salient poles 1.sub.1, 1.sub.2, . . . 1.sub.p comprise n sets of poles each differing in phase. The stator teeth 3 are disposed so that their pitch .tau..sub.S =.tau..sub.R.times. {1.+-. 1/(n.times.k)}.
Claims6
In a stepping motor having a stator and rotor, said stator having a number P of salient poles facing said rotor and in which each stator has a number of teeth k each disposed on a surface of a salient pole at equal pitches .tau..sub.S, said rotor having a number of teeth each disposed at equal pitches .tau..sub.R the improvement comprising that said P stator salient poles comprise n sets of poles each differing in phase and that said stator teeth are each disposed so that their pitch .tau..sub.S =.tau..sub.R .times.{1.+-.1/(n.times.k)}, wherein n, P and k are integers, so as to eliminate the detent torque.
Dependencies are inferred from the claim text.