Stepper motor and winding device

A stepper motor, comprising:

• two plates arranged opposite to each other;
• a rotary shaft having two ends supported on and in rotational connection with the two plates, respectively;
• a magnet sleeved and fixed on an outer periphery of the rotary shaft;
• and
• a stator unit sleeved on the rotary shaft;
• wherein the two plates are arranged on both sides of the magnet in an axial direction of the rotary shaft and arranged to space from the magnet, and the stator unit comprises windings arranged to space from the magnet and fixed between the two plates;
• wherein each winding of the windings comprises a respective casing that is hollow and arranged between the two plates, a respective claw pole fixed at an end of the respective casing and coaxial with the respective casing, and a respective coil wound on an outer periphery of the respective claw pole, and two ends of the respective coil extend outside the respective casing, respectively;
• and
• wherein the respective casing and portions of the respective claw pole in contact with the respective coil are coated with insulating coatings.