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What happens if load torque is same at full speed in separately excited dc motor?
Same as what? at maximum speed and torque, the motor delivers maximum power.
What is separately excited DC motor?
The main difference between the Separately excited motor and the shunt motor is the field cct where as in the second it has its own voltage supply.AnswerI think you mean 'generator', not 'motor'. A 'self-excited' motor is one in which the output supplies the field current, as well as the load current. A 'separately-excited' motor is one in which the field current is provided from an external source.
What happens if load torque is same at all speed in separately excited dc motor?
It means that the armature must be supplied with a constant-current source.
Are tachogenerator always separately excited?
Tachogenerators are not always separately excited; they can be self-excited or separately excited depending on their design and application. In separately excited tachogenerators, an external power source provides the excitation current, allowing for better control and stability. Self-excited tachogenerators generate their own excitation voltage through the interaction of the rotor's movement and the magnetic field. The choice between the two types depends on specific operational requirements and system configurations.
Is a DC motor single excited or double excited?
It is doubly excited if it is sparately excited dc motor, singly excited if it is self excited machine
What is separately-excited generator?
in a separately excited generator the field coils are excited from a separate source like a dc battery may be or any other small generator. They are self starting generators.
Discuss the curves of separately excited and self excited machine?
it is normally in the age above 14
Is torque and current proportional?
Sometimes, for example in a separately excited dc motor. But in a series-wound dc motor the torque is proportional to current-squared, which gives the motor a very high starting torque and this makes series motors very popular for traction.
Application of separately excited dc generators?
As a separate supply is required to excite field, the use is restricted to some special applications like electro-plating, electro-refining of materials etc. But what is the difference between self excited and separately excited?
Why synchronous motor called double excited motor?
AC and DC supply sources we are given to motor so we are called double excited motor
Can you use the separately excited shunt generator machine as self excited generator?
You have a seperately excited generator and then you have a shunt generator which has the field winding in parallel with the armature terminals. In DC machines a separately excited generator could be run as a shunt generator provided the field winding is designed to work on the generated voltage. A separately excited alternator needs a DC supply for the field winding. In car alternators that is taken from the main winding via a rectifier and a voltage regulator.
Which the effect of the increase of the armature voltage on the speed of a direct-current separately excited motor in case of constant load?
Increasing the armature voltage would increase the speed. In a separately excited dc motor the speed adjusts so that the back emf generated by the armature is a little less than the supply voltage. The difference, divided by the resistance, gives the current drawn, which is also proportional to the shaft torque supplied to the load.
