Screeching Stepper Motor

[Zhane]

I need some help here.
My stepper motor always produces the screeching sound no irregard to the speed I set it to how can I remove this sound??

 

[FvM]

Hardly possible to give less information

 

[CMOS]

Possibly rotor bearing noise.

 

[bunalmis]

Bad chopper type driver can produce sound.
This is instability problem.

 

[boy_paksit]

I need some help here.
My stepper motor always produces the screeching sound no irregard to the speed I set it to how can I remove this sound??

:?:
:?:hi sir, gud noon, i am boy_paksit from cebu,philippines. i am new to stepper motor and RF technology. Can i ask your schematic diagram of your circuit.? please, coz i am planning to control a stepper motor wirelessly, but unfortunately i have no idea on how to bias and contorol a stepper motor wirelessly.
It is my gratitude to receive a reply from you. Thanx...