Accelerating a stepper motor to a certain speed without it making any noise?

[215]

Accelerating a stepper motor to certain speed without it making any noice?

I am having some issues moving my stepper motors without it making noise.

I read somewhere that ramping the frequency of the pulse modulated signal would help, but seems to have same issues as well. Is the "acceleration" to steep..?

The stepper motor i am using is a [**broken link removed**][1], and it is connected to a driver board, which has requires the input signal enable, direction and step => which is the one i am ramping. [Driverboard][2]

HEre is the code:

    void setup()
    {
      Serial.begin(9600);
      pinMode(9, OUTPUT); //Step
      pinMode(12,OUTPUT); //en
      pinMode(13,OUTPUT); //dir
      TCCR1A = _BV(COM1A1) | _BV(COM1B1) ; // phase and frequency correct mode. NON-inverted mode
      TCCR1B = _BV(WGM13) | _BV(CS11);     // Select mode 8
                                           // Prescaled by 8 on main clock.
    }
    
    
    float count = 1000; //
    
    void loop() {
      // put your main code here, to run repeatedly:
      //output_freq = CPU_clk/(2*8*ICR1_value)
      //ICR1 = CPU_clk/2*8*output_freq
      digitalWrite(12,HIGH);
    
      delay(1);
    
      digitalWrite(13,HIGH);
    
      delay(1);
      ICR1 = count;
      OCR1A = int(count/2);

      while(1)
      {
         if(count != 20)
         {
           count -= 10;
         }
      }
    }

The ICR1 value is computes using this formula ICR1 = (cpu_freq)/(2*prescaler*desired_freq)

I guess the problem is that i am not ramping correctly.. ?

 

[barry]

Re: Accelerating a stepper motor to certain speed without it making any noice?

1) Use microstepping.
2) If it's making noise, it might be because of a resonance; a mechanical damper might help.
3) Your ramping profile will also affect things. (i.e., sinusoidal ramp vs. linear ramp).