Hello,
Can someone please clarify with me what continuous and peak current and how it relates to hobby servos.
I found this somewhere online:
"When a servo makes small movements it draws a higher peak current than when moving a larger distance. Why? When the servo motor is stationary, only its (low) armature resistance limits current flow. Once the motor starts turning it generates a voltage which opposes the power supply, so the effective voltage is less and current drops."
2) What do they mean by "When the servo motor is stationary, only its (low) armature resistance limits current flow"
Q: Are they referring to the opposing torque on the motor and how that can affect the current draw? Im sorry I dont understand it that well. Current draw is apparently different when there is a load and when there isnt a load. Why is that?
3) What do they mean by this "Once the motor starts turning it generates a voltage which opposes the power supply, so the effective voltage is less and current drops.""
Q: This sounds like back emf. Voltage Source - Back EMF = Voltage.
How does that relate to current drop and peak current?
4) I found this online somewhere:
"As revs rise so does the back EMF, opposing the Applied EMF and reducing the Current."
Q: if the current is reduced then this is obviously not peak current?
Sorry Im not too sure if right on track. hopefully someone can clarify this for me.
Thanks,
Ben