DC motors, like AC motors, can be configured to turn in either direction. Their direction can be easily controlled by inverting the polarity of the applied armature voltage by reversing the armature leads.
What happens if you turn a DC motor backwards?
If you try to stop or reverse it manually, then it will try to draw whatever current is needed to continue running at that speed. The high current could heat the motor to the point of damage, unless the power supply limits the current.
How do you change the direction of a DC motor?
Of course, the direction of current is controlled by the polarity of the voltage. So in order to change the direction of rotation, we can simply reverse the voltage, causing the current to flow in the opposite direction, changing the force by 180 degrees and the motor to be driven ‘backwards’.
How do you determine the direction of rotation of a motor?
One way to test motor direction is to take your best guess on how to connect the leads, then run the motor and note the direction it spins. If you’re wrong, you undo two leads and swap the wires. Just to make sure, run the motor again. If it spins in the correct direction, you can then couple it to the load.
How do you control the speed and direction of a DC motor?
Thus, the speed of a DC motor can be controlled in three ways:
- By varying the supply voltage.
- By varying the flux, and by varying the current through the field winding.
- By varying the armature voltage, and by varying the armature resistance.
Which DC motor has maximum self loading property?
Which DC motor has got maximum self-loading property? Explanation: A differentially compound DC motor, flux reduces so sharply at small increase in load at higher values of load.
How do you reverse the rotation of a DC motor?
The direction of rotation of DC series motor may be reversed by changing the polarity of either field or the armature winding.
How do you determine the polarity of a DC motor?
1 Answer. DC motors can usually run with either polarity but direction of rotation will be reversed. Read the data sheet or the label on the motor if you need to be sure it will turn the right direction on start. The armature draws more current than the field so needs a heavier wire.
What are Interpoles in a DC motor?
Interpoles. Interpoles are designed in DC motors to overcome the effects of the armature reactance and the self-induction of the machine. … This creates a changing magnetic field equal to and opposite that of the armature, thereby cancelling the effect. Polarity of an interpole depends on the direction of rotation.