WHAT IS series DC motors?
A series DC motor connects the armature and field windings in series with a common D.C. power source. The motor speed varies as a non-linear function of load torque and armature current; current is common to both the stator and rotor yielding current squared (I^2) behavior.
How a DC motor works step by step?
In a DC motor, the stator provides a rotating magnetic field that drives the armature to rotate. A simple DC motor uses a stationary set of magnets in the stator, and a coil of wire with a current running through it to generate an electromagnetic field aligned with the centre of the coil.
How are DC series motors controlled?
Speed adjustment of a DC series motor by armature control may be done by:
- Armature Resistance Control Method.
- Shunted Armature Control Method.
- Armature Terminal Voltage Control.
Where are DC series motors used?
Series DC motors are generally used where high starting torque is required, and speed variations are possible. These types of direct connection motors are, for instance, used in the traction system, cranes, air compressors, vacuum cleaners, sewing machines, etc.
Can a DC series motor operate in AC?
We already know that in a DC Series motor the field winding has very less resistance than a DC Shunt Motor as the field is connected in series with the Armature Winding. So if we give AC supply on a DC Series Motor it will run perfectly. In fact, DC Series can run on both AC and DC supply.
How does DC shunt motor work?
The working principle of a DC Shunt Motor is, whenever a DC motor is turned ON, then DC flows throughout the stator as well as the rotor. This current flow will generate two fields namely the pole as well as the armature.
Why back emf is induced 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.
How do DC motors generate electricity?
Electric motors turn electricity into motion by exploiting electromagnetic induction. A simple direct current (DC) motor is illustrated below. The motor features a permanent horseshoe magnet (called the stator because it’s fixed in place) and an turning coil of wire called an armature (or rotor, because it rotates).
What is a rotor in a DC motor?
The rotor contains coil windings that are powered by the DC current and the stator contains either permanent magnets or electromagnetic windings. When the motor is powered by DC current, a magnetic field is created within the stator, attracting and repelling the magnets on the rotor.
How do you control the RPM of a DC motor?
Thus, the speed of a DC motor can control in three ways: By varying the flux, and by varying the current through field winding. By varying the armature voltage, and the armature resistance.
Which DC motor is preferred for elevator?
DC cumulative compound motor having high starting torque up to 450% depending upon the degree of compounding. The speed regulation is varying up to 25 ~ 30%. That’s why these motors are used in elevators.
How can we control the speed of DC series motor?
Speed control of series motor
- Flux control method. Field diverter: A variable resistance is connected parallel to the series field as shown in fig (a). …
- Variable resistance in series with armature. By introducing resistance in series with the armature, voltage across the armature can be reduced. …
- Series-parallel control.
Can I connect DC motor directly to battery?
Yes, It is safe. You can connect your DC motor directly to your battery(if the voltages are same) . Your motor will work continuously ~100 hours in this battery.
What are the advantages of DC series motor?
Advantages of DC series motors:
- It is an easy assembly and simple design.
- Vast starting torque.
- Protection is very easy.
- It is cost-effective.
- Series wound motors can use for AC or DC supply so it is also known as universal motors.
- Compare with shunt motor DC series motor develop power for the same construction size.
What is the difference between DC motor and DC machine?
DC motor converts electrical energy into mechanical energy whereas DC generator converts mechanical energy into an electrical energy.
Difference between DC Motor and DC Generator.
|Characteristics||DC Motor||DC Generator|
|Types||Shunt and compound wound||Shunt, compound, and series wound|