Stator Slot Fill


Electric motors convert electrical energy into mechanical energy in the form of torque. Current flowing through copper wire coils wrapped around an iron core (stator) creates an electro-magnetic field that either opposes or attracts the magnetic field provided by permanent magnets mounted to a drive shaft (rotor).

The interaction of the electromagnetic field with the permanent magnet field is what produces torque. The motor’s torque output is determined by the voltage applied to the wire, the density of the wire, and the number of coils. The motor’s maximum speed is determined by the amount of current flowing through the coils.

The application requirements for which the motor will be applied, therefore, largely determines the coil winding requirements—creating a design challenge for engineers.

To find out more about Slot Fill and Design for Manufacturability, please fill out the form below to receive our Whitepaper and learn more about:

  • Basic Principle
  • Stators and Slots
  • Slot Fill Factor
  • Calculating Slot Fill
  • Factors in Manufacturability
  • And more!


  • Get the White Paper by filling out this form

  • This field is for validation purposes and should be left unchanged.