Coils in line between disconnect and motor

[JesseETG]

Im working on an old oven in a bakery. The oven has a motor that works to turn a plate inside the oven.
The motor power goes from a disconnect to some type of coils to the motor. Does anyone know the purpose of the coils, before the motor?

 

[Electromatic]

WAG: Resistors to drop the voltage so the plate turns slowly?