Stepper motor device
AssigneeJohnson Electric S.A.
InventorsYue LI, Jian Zhao
Life of this patent
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Abstract
A stepper motor device has a stator and a rotor. The rotor comprises: a shaft; a rotor core associated with the shaft; and a magnet fixed to the rotor core. The stator comprises: a stator shell; a yoke disposed within the shell; a coil wound about the yoke and an end plate magnetically connecting the yoke to the stator shell. The coil is located beside the magnet in the axial direction of the motor. The stator has a number of salient poles, and the salient poles are arranged to face the magnet across a small air gap. The coil creates magnetic poles in the salient poles with a common polarity.
Claims13
A stepper motor device comprising:
- a rotor core, a magnet fixed to the rotor core, and a stator including a magnetically conductive shell and a coil disposed in the shell, the stator having a salient pole arranged to face the magnet across a small air gap, wherein the coil is disposed axially beside the magnet.
Dependencies are inferred from the claim text.