Contents
What is the principle of DC series motor?
The DC motor is the motor which converts the direct current into the mechanical work. It works on the principle of Lorentz Law, which states that “the current carrying conductor placed in a magnetic and electric field experience a force”. And that force is the Lorentz force.
What does a DC machine do?
A direct current (DC) motor is a type of electric machine that converts electrical energy into mechanical energy. DC motors take electrical power through direct current, and convert this energy into mechanical rotation.
What are the types of DC machine?
There are 4 main types of DC motors:
- Permanent Magnet DC Motors. The permanent magnet motor uses a permanent magnet to create field flux.
- Series DC Motors. In a series DC motor, the field is wound with a few turns of a large wire carrying the full armature current.
- Shunt DC Motors.
- Compound DC Motors.
What are the main parts of DC machines?
Construction wise there are four Main parts of DC machine namely field magnet, armature, commutator and brush. Actually a DC machine means a DC motor or a DC generator constructionally both are same.
What is the one disadvantage of Series DC motor?
The series motor has poor speed regulation. When the load speed of the machine increases, the DC shunt motor keeps its constant speed from no load to full load. The dc series motor’s Torque drops sharply when the speed increases.
Which is more powerful AC or dc motor?
AC motors are generally considered to be more powerful than DC motors because they can generate higher torque by using a more powerful current. However, DC motors are typically more efficient and make better use of their input energy.
Why starting current is high in dc motor?
Answer: The starting current is high as there is no back EMF or counter EMF present in the armature circuit because atstarting counter EMF is zero. It’s armature has very less resistance due to this it need more current at starting time. Hence DC starters are used to limit the starting current ofmotor.
What are the two main parts of a DC machine?
Basic Components of a DC Machine There are two main parts, the stator and the rotor. The stator contains parts such as brushes, magnets and housing for the whole motor. The rotor contains the windings, the communicator and the output shaft. The two parts work together when voltage is applied to create a moving motor.
What are the different types of DC machines?
The ball type or roll type barring is used in the DC machine. There are different types of DC machines like series, shunt, short shunt compound and long shunt compound. In this type of machine, the field winding is electrically separate from the armature winding. There is no physical connection between the field winding and the armature winding.
What makes a series wound D.C machine?
Series wound D.C. Machines is the machine in which the field coils are connected in series with the armature. The series field winding carries the armature current, and the armature current is large, that is why series field winding consists of few turns of wire of large cross-sectional area.
What kind of machine is a DC generator?
A DC Machine is an electro-mechanical energy conversion device. There are two types of DC machines; one is DC generator, and another one is known as DC motor. A DC generator converts mechanical power (ωT) into DC electrical power (EI), whereas, a DC motor converts d.c electrical power into mechanical power.
How is the armature winding in a DC machine?
According to the connection between field winding and armature winding, the DC machines are classified as; In this type of DC machine, the field winding is connected in series with the armature winding. Because of the series connection, the entire load current (armature current) will pass from the field winding.