In a series DC motor used for traction, the armature rheostat is there to limit the current on starting. In normal running the rheostat is set to zero ohms (maximum power) so that power is not wasted in it. At full speed the power is turned off, the vehicle then coasts along until it's time to stop.
There is nothing to limit current until opposing magnetic fields build up at generator operating speed-windings will overheat and burn.
With increasing torque load the armature tends to slow down; the motor draws more current to compensate, and if there is armature resistance the back emf generated by the armature falls to allow the increased current to flow, which causes the motor to settle at a lower speed. The mechanical output power is the speed times the torque, and increasing the torque increases the power output provided the speed does not drop much.
Embalmed abstraction: The cylinder must be maintained in an upright position. Simple: The cylinder must be kept upright.
No, these can be switched depending on the requirements of the application. It is more practical to have the armature windings (since they will carry the full load current) as the stator for this will require larger wires and is also easier to cool if kept stationary. The field windings do not carry the full load current of the load so this requires smaller wires and smaller slip rings since this is the piece that will rotate.
inversion temperature Ti is twice the neutral temperature Tn.
It isn't. It is only kept at maximum resistance when the motor is not running. That is done to limit the starting current.
First remember this rheostat is connected in series with the armature to increase the total resistance to limit the starting current, thus achieving max starting torque from the motor
the back emf increases so that high currents doesn't pass through the field windings
fowler position.
The highest position
There is nothing to limit current until opposing magnetic fields build up at generator operating speed-windings will overheat and burn.
15000
Relation isF=pi*i*L*sin thetaBut T= r*fso T= pi*i*r*L*sin thetapi(flux) and i (current) are changeable while all others are constant.soT= k pi * iDc servomotor Under Feild Control:** Armature Current is Kept Constant** Flux can be variedThe armature current can be kept constant by applying a constant current source at armature winding of DC servoMotorTorque generated by the dc servo motor is controlled by feild current..This mode of operation is called Feild Control
he killed people if they didn't vote for him
a position as a substitute at Gualtieri, which he kept for one year.
a position as a substitute at Gualtieri, which he kept for one year.
a. To get a stronger magnetic field b. to improve the air circulation c. To reach the higher speed of rotation d. To make the rotation easier