Power. The power of a motor is
the product of its speed and torque
. The power output is greatest at about half way between the unloaded speed (maximum speed, no torque) and the stalled state (maximum torque, no speed). The output power in watts is about (torque) x (rpm) / 9.57.
How do you make a motor more powerful?
We can increase the turning force (or torque) that the motor can create in three ways: either we can have a more powerful permanent magnet, or we can
increase the electric current flowing through the wire
, or we can make the coil so it has many “turns” (loops) of very thin wire instead of one “turn” of thick wire.
What makes a DC motor more powerful?
The speed of rotation of the coil in a D.C. motor can be increased by: (i)
Increasing the strength of the current
, (ii) Having more turns in the coil, (iii) Increasing the area of the coil, (iv) By increasing the strength of the magnetic field.
What factors increased the speed of DC motor?
Speed of rotation of a d.c. motor can be increased by increasing one or more of the following : (i)
Area of the coil
. (ii) Number of turns of the coil. (iii) Strength of the magnetic field.
What are the 4 types of DC motor?
- 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 is the working of DC motor?
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 makes a motor go faster?
A faster motor. One easy way to make the motor run faster is
to add another magnet
. … As you move the magnet closer to the spinning coil, one of two things will happen. Either the motor will stop, or it will run faster.
What is the speed of a DC motor?
DC controls adjust speed by varying the voltage sent to the motor (this differs from AC motor controls which adjust the line frequency to the motor). Typical no load or synchronous speeds for an AC fractional horsepower motor are 1800 or 3600 rpm, and
1000-5000 rpm for DC fractional hp motors
.
Can we increase the RPM of motor?
Yes
, but with a small amount above the maximum speed under normal rated conditions. Increasing the speed can be achieved by increasing the supply frequency as the speed and frequency are directly proportional; however, there are two constraints.
How can you reduce the speed of a DC motor?
- By varying the supply voltage.
- By varying the flux, and by varying the current through the field winding.
- By varying the armature voltage, and by varying the armature resistance.
How do you increase the rotation speed of a DC motor?
The speed of the rotation of the electric motor can be increased by
changing the resistance of the circuit
, by decreasing the resistance of the electric motor, there is the increase of the current then the current strength will increase. So, the speed of the rotation of the electric motor will increase.
What factors will affect the rotation of an electric motor?
The rotating speed of an electric motor depends on two factors:
its physical construction, and the frequency (Hz) of the voltage supply
. Electrical engineers select the speed of a motor based on the needs of each application, similar to how the mechanical load determines the horsepower required.
How do you identify a DC motor?
Look for
the commutator & brushes and salient field system
to confirm. (iii) has 5 terminals, then it is a AC synchronous motor (3 for stator and 2 for field). Look for 2 slip rings for rotor dc supply. (iii) has 4 terminals, then it may be a DC motor, in which case look for the commutator & brushes to confirm.
What are the parts of DC motor?
- Stator. A stator is one of the DC motor parts that is, as the name suggests, a static unit containing the field windings. …
- Rotor. …
- Yoke. …
- Poles. …
- Field Windings. …
- Armature Windings. …
- DC Motor Commutator. …
- Brushes.
Which is type of DC motor?
Types of DC Motors. There are 3 main types of DC motor that are available
:- Series, Shunt and Compound
. These terms relate to the type of connection of the field windings with respect to the armature circuit.
How does a DC motor start?
So, a DC motor is started by
using a starter
. There are various types of dc motor starters, such as 3 point starter, 4 point starter, no-load release coil starter, thyristor controller starter etc. The basic concept behind every DC motor starter is adding external resistance to the armature winding during starting.
