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What is mechanical loss in dc machines?
Friction and windage causes mechanical loss in DC machines.
What are the constant losses in a DC machine?
Constant losses Those losses in a d.c. generator which remain constant at all loads are known as constant losses. The constant losses in a d.c. generator are: (a) iron losses (b) mechanical losses (c) shunt field losses
Why silicon steel is use in armature of dc machine?
Silicon steel is used in the armature of DC machines primarily for its excellent magnetic properties, which enhance efficiency and reduce energy losses. The addition of silicon improves the electrical resistivity and reduces eddy current losses, allowing for better performance at higher frequencies. Additionally, silicon steel's mechanical strength and durability contribute to the overall reliability and longevity of the machine. This combination of benefits makes silicon steel an ideal material for the armature in DC machines.
Where does copper losses in dc machines?
Copper losses are also referred to as I^2 R losses. Copper loss is due to heating due to the current passing through the copper windings.
What is airgap in dc macines?
The airgap in DC machines refers to the physical space between the stator and rotor (or armature) components. This gap is crucial for the operation of the machine, as it affects the magnetic field and the overall efficiency of the motor or generator. A properly designed airgap minimizes losses and ensures effective magnetic coupling, while an excessively large airgap can lead to reduced performance and increased energy losses.
What are the possible losses for a dc generator?
Friction in the bearings and in the commutator, and windage loss. Electrical resistance of the armature and field windings and the brushes.
What is the difference between electrical and mechanical devices?
Electrical degrees and mechanical degrees in dc motors are related by the equation: Deg(elec) = (Number of Poles/2) *(Deg(mech))
What is the principles of DC machines?
All DC machines are works based on the principle of FARADAY'S LAW OF ELECTROMAGNETIC INDUCTION.
How can the field coils of DC machines be connected with self excited machines?
No
How many types of DC machine?
05 types of dc machines
Would the losses decrease if a cooling fan is mounted in the dc motor?
Yes, mounting a cooling fan on a DC motor can help decrease losses by improving heat dissipation. Excessive heat can lead to increased resistance in the motor windings, which contributes to energy losses and can reduce efficiency. By maintaining a lower operating temperature, the motor can perform more efficiently, leading to reduced losses and potentially extending its lifespan.
How is DC shoes made?
machines
