The name of the stationary motor part that produces the magnetic field during operation is the

Stator

Explanation:

 The stator is one of rotary system that basically refers to the stationary part and it is generally found in the various types of electric motors, biological rotors and the electric motors.

 The stator basically produced the magnetic field and the it converted into the electric current for the rotating purpose in the system. When the stator producing the magnetic field by driving the specific rotating armature.

 According to the given question, the stator is one of the stationary motor part which producing the magnetic field at the time of operation.

 Therefore, Stator is the correct answer.

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