Stepping motor for electronic timepiece
OwnerFumio Nakajima, Takayasu Machida +1inventors
InventorsFumio Nakajima, Takayasu Machida, Kenji Yamada
Life of this patent
Estimating the term…
Abstract
A stepping motor for an electronic timepiece comprises a permanent magnet rotor, a stator and a driving coil, having at least one static equilibrium point for the rotor. The driving coil is arranged to be energized by a current smaller than a driving current so that the stator is energized to required polarities of low flux intensity, whereby the static equilibrium point for the rotor is electromagnetically shifted to an arbitrary position to permit rotation of the rotor in any desired direction.
Claims17
A stepping motor comprising a permanent magnet rotor, a stator including a driving coil and stator pole pieces electromagnetically connected thereto, said stator having at least one static equilibrium point at which said rotor is stable, and a control unit electrically connected to said driving coil, said control unit including means for energizing said driving coil to electromagnetically shift the static equilibrium position to a predetermined position.
Dependencies are inferred from the claim text.