Why DC motors are self-regulating?
Why DC motors are self-regulating?
The presence of back e.m.f. makes the d.c. motor a self-regulating machine i.e., it makes the motor to draw as much armature current as is just sufficient to develop the torque required by the load. armature current i.e., it automatically changes the armature current to meet the load requirement.
Which motor is known as self-regulating motor?
Now Ia = Va – Eb/ Ra therefore, armature current increases hence torque and speed increase. From the above discussion, we can say that DC motor can maintain the same speed with a variable load. Back emf act as governor i.e it makes motor self-regulating because it draws as much current as is just necessary.
Are DC generators the same as DC motors?
The most significant difference between DC motor and DC generator lies in the conversion mechanism. DC motor converts electrical energy into mechanical energy whereas DC generator converts mechanical energy into an electrical energy.
Is the same DC machine can be used as both DC generator and DC motor?
Each DC machine can act as a generator or a motor. Hence, this classification is valid for both: DC generators and DC motors. DC machines are usually classified on the basis of their field excitation method.
What is DC shunt generator?
A shunt generator is a type of direct current electric generator in which field winding and armature winding are connected in parallel, and in which the armature supplies both the load current and the field current.
Why back EMF is used in DC motor?
When the armature of the DC motor rotates under the influence of driving torque, the armature of the conductors moves through a magnetic field inducing an emf in them. The induced emf is in the opposite direction to the applied voltage and is known as the back emf.
Can a DC motor be turned into DC generator?
A DC motor with permanent magnets can be used as a generator, just by spinning the shaft. If it is a brushless motor, alternating current is produced, so rectifier circuitry has to be installed to convert the output to DC.