Cogging torque of electrical motors is the torque due to the interaction between the permanent magnets of the rotor and the stator slots of a permanent magnet machine. It is also known as detent or no-current torque. ... Cogging torque is an undesirable component for the operation of such a motor.
What is a slotted motor?
The stator assembly typically consists of soft iron laminations with radially protruding teeth. The spaces between these teeth are called slots and allow electromagnetic coil wire to be inserted. This motor type is termed slotted motor.
How do you reduced the cogging of the motor?
In hardware, the most effective way to reduce cogging torque is skewing the rotor magnets or stator slots. This design reduces cogging torque ripple but complicates the production process and increases the final price of the product.