Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: Tony Woollacott on August 15, 2011, 04:36:30 AM

Title: Noisy Steppers when stationary
Post by: Tony Woollacott on August 15, 2011, 04:36:30 AM
Just got my little router put together and it works really well, but the steppers are very noisy when stationary :-\. There are no issues with torque, accuracy, speed, or temperature, they really work well, but if there is a way to quiet them down I would be even happier ;D.
Can any one help?
Title: Re: Noisy Steppers when stationary
Post by: RICH on August 15, 2011, 05:33:53 AM
Tony,
Post info on your drives and how the steppers  are wired.
Are you using current reduction when they are stationary?
RICH
Title: Re: Noisy Steppers when stationary
Post by: Tony Woollacott on August 15, 2011, 05:41:55 AM
Ok, I will have to do that tonight, as I am at the office now.
Title: Re: Noisy Steppers when stationary
Post by: RICH on August 15, 2011, 06:02:37 AM
What i am guessing is that you have a switch on the driver for current reduction and when the motors are stationary it reduces the current to the motor.
The motor then dosen't have adequate  holding torque ie; it sort of just sits there trying  to maintain postion  and thus oscilates.
Said a different way the electrical field is not strong enough to hold the rotor in one position relative to the winding.

Could be wrong but that is the only time I experienced some noise coming from a stepper sitting idle.

RICH
Title: Re: Noisy Steppers when stationary
Post by: Tony Woollacott on August 15, 2011, 08:12:21 AM
Makes perfect sence, thanks, I will let you know if you are right.
Title: Re: Noisy Steppers when stationary
Post by: Tony Woollacott on August 17, 2011, 03:09:12 AM
Thanks Rich you were spot on, all is now good.