What determines the direction of rotation of a DC motor?
The direction of rotation of a DC motor depends on the direction of the magnetic field and the direction of current flow in the armature. If either the direction of the field or the direction of current flow through the armature is reversed, the rotation of the motor will reverse.
How can you reverse the direction of rotation of a DC motor?
The direction of rotation of a dc motor can be reversed:
- By reversing the connections of both armature and the field windings with the supply.
- By reducing the field flux.
- By reversing the connections of either the armature or the field winding connection with the supply.
How do you change the direction of a 12v 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 change the polarity of a DC motor?
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. This works with shunt, series, and compound wound DC motors.
How can the direction of rotation of a DC electric motor be changed quizlet?
How can the direction of rotation of a DC electric motor be changed?. Option A. reverse the electrical connections to either the field or armature windings. … reverse the electrical connections to either the field or armature windings.
How do you increase the torque of a DC motor?
Any DC motor will experience a decrease in speed when a load is applied, which causes the back EMF to decrease. The reduction in back EMF increases the net voltage, since the supply voltage remains constant. The net voltage increase causes the armature current to increase, which increases the motor torque.
How do you control torque in a VFD?
Torque control mode allows for the VFD to directly control motor torque instead of motor speed. This is necessary for any application where torque takes priority over speed. Winder, rewinders, capping, and web applications are some good examples of when torque control is utilized.