The direction of rotation of a DC shunt motor can be reversed by changing the polarity of either the armature coil or the field coil. You can reverse the direction by simply reversing the armature leads. The same can be done with a shunt motor and a compound motor.
Why and how does the DC shunt motor reversed its direction?
The commutator changes the direction of the current in the armature conductors as they pass across poles of opposite magnetic polarity. Continuous rotation in one direction results from these reversals in the armature current.
Which of the following rule is used to determine the direction of rotation of DC motor?
Which of the following rule is used to determine the direction of rotation of D.C motor? Answer 4. Fleming’s left-hand rule.
What are the applications of a DC shunt motor?
The applications of shunt DC motor include the following. These motors are used wherever stable speed is required. This kind of DC motor can be used in Centrifugal Pumps, Lifts, Weaving Machine, Lathe Machines, Blowers, Fans, Conveyors, Spinning machines, etc.
What happens if the direction of current at the terminals of a series motor is reversed?
Though the direction of current at the terminals of series motor is reversed the direction of rotation of motor will be same as previous. … The motor would continue to run in the same direction since the direction of the current would be reversed in both the armature and the field windings.
How do you control the speed of a DC shunt motor?
Thus, there are three general methods of speed control of D.C. Motors.
- Resistance variation in the armature circuit: This method is called armature resistance control or Rheostat control.
- Variation of field flux Ф This method is called field flux control.
- Variation of the applied voltage.
What is difference between shunt and compound motors in after reverses the direction of rotation?
When the direction of rotation of a series or shunt motor is to be changed, either the field or the armature leads can be reversed. Many small DC shunt motors are reversed by reversing the connection of the shunt field leads. … When a compound motor is to be reversed, only the armature leads are changed.
Which of the following rule is used to determine the direction of rotation of coil?
Answer. Explanation: The direction of the force on the wire is determined by Fleming’s left-hand rule. The motor effect is when a coil of current-carrying wire rotates due to its presence in a magnetic field.
What increases the speed of a motor rotation?
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. … Electric motors rotate at different speeds with different voltages.
What is the need of 3 point starter?
A three-point starter is an electrical device, used for starting as well as maintaining the DC shunt motor speed. The connection of resistance in this circuit is in series which decreases the initial high current and guards the equipment against any electrical failures.
What are the characteristics of DC shunt motor?
Characteristics of a DC Shunt Motor:
- Speed-Armature Current Characteristic: …
- Torque-Armature Current Characteristic: …
- Speed-Torque Characteristic: …
- Break in Field Circuit of a DC Motor:
Why DC shunt motor is constant speed?
If the load on the motor increases armature speed reduces and thereby cause a reduction in the back emf. … Hence, a DC shunt motor always maintains a constant speed. Under no load condition, the back emf becomes nearly equal to the applied voltage.
What are the advantages of DC shunt motor?
Advantages of Dc shunt motor:
- The power supply of the DC motor is any way cheap.
- Shunt would motor able to runs at a predetermined speed.
- The speed of a dc shunt motor is sufficiently constant.
- Direct current machines can use for heavy industrial applications where the torque and speed wider range.