Hi,
I am using 12V / 300mA unipolar stepper motor which is driven by DRV8884 driver IC with 12v supply.
Settings of driver IC is as below:
1) M1 = 0, M0 = 1, 1/16 micro stepping
2) TRQ = 0, current scaler to 100%, (no current scaling)
3) DECAY = 15 kΩ to GND, Mixed decay: 30% fast (increasing as well as decreasing)
4) RREF = 100 kΩ to GND, 300mA current set
when stepper motor is running, there is not any problem in all circuit as well as in stepper motor.
stepper motor is running very smoothly without making any kind of noise. It works perfectly.
Here i want to take two cases when stepper motor is not running.
1)
when stepper motor is not running,
ENABLE pin is low, i.e. MOSFET switch (output driver) is disable.
nSLEEP pin is low, driver ic in sleep mode.
when we want to run stepper motor , then first we logic high above two pins then move the stepper motor, then again logic low above two pins.
in this case , stepper motor is not making any kind of humming noise in both running & not running condition.
2)
when stepper motor is not running,
ENABLE pin is high, i.e. MOSFET switch (output driver) is enable.
nSLEEP pin is high, driver ic in wake up mode.
in this case when stepper motor is running, there is not any kind of noise, stepper motor runs perfectly,
but when stepper motor stops moving, we get humming sound of each time different intensity, some times loud , some times slight .
I want to solve this issue of humming sound.
kindly, help me to solve the issue.
regards,
jigar