Manufacturing method of a multi-pole magnetic circuit, multi-pole magnetic circuit, and stepper motor

Abstract

Provided is a manufacturing method of a multi-pole magnetic circuit, a multi-pole magnetic circuit, and a stepper motor. The method includes: providing first magnets each having a sector-shaped cross-section; assembling the first magnets to obtain a first cylindrical body; and grinding a side surface of the first cylindrical body to obtain a second cylindrical body, and electroplating an outer surface of the second cylindrical body to form a coating, to obtain the multi-pole magnetic circuit for a stepper motor. In the manufacturing method, by preparing the first magnets having larger dimension, assembling the first magnets to obtain the first cylindrical body having larger outer diameter, and grinding the side surface of the first cylindrical body to obtain the second cylindrical body having smaller outer diameter, difficulty of the assembly operation is reduced, roundness and concentricity as well as reliability of the magnetic circuit are improved.

Dependencies are inferred from the claim text.