Table of Contents
- 1 How do you start a DC shunt motor?
- 2 What is the necessity of a starter for DC shunt motor?
- 3 How do you start a DC motor?
- 4 What are the types of starter used for starting DC motor?
- 5 Why do we need a 3 point starter for a DC machine?
- 6 Which type of winding is used in DC shunt motor?
- 7 Are DC motors self starting?
- 8 Which of the following starter can sufficiently start the DC series motor *?
- 9 How do you start a motor without excessive armature current?
- 10 What is the purpose of a motor starter?
How do you start a DC shunt motor?
If armature and field of d.c. shunt motor is energized together, a large current is drawn at the start but the torque builds up gradually as the field flux increases gradually. To improve the torque per ampere of line current drawn it is advisable to energize the field first.
What is the necessity of a starter for DC shunt motor?
Starters are used to protect DC motors from damage that can be caused by very high current and torque during startup. They do this by providing external resistance to the motor, which is connected in series to the motor’s armature winding and restricts the current to an acceptable level.
Which starter is used for shunt motor?
Three point starter is used in shunt wound DC motor or compound wound DC motor. To start the motor, the starter arm is moved to stud 1 in the clockwise direction ie) whole of the resistance is added to the armature winding of the dc motor.
How do you start a DC motor?
Three-point starter: When we have to start the dc connected motor, the lever turns gradually to the right. When the lever touches the point 1, the field winding gets directly connected across the supply.
What are the types of starter used for starting DC motor?
Detailed Solution. There are mainly 3 types of DC motor starters, such as 2 point starter, 3 point starter and 4 point starter. The basic concept behind every DC motor starter is adding external resistance to the armature winding during starting.
Why did you use a 3 point starter for starting DC shunt motor?
3 Point Starter is a device whose main function is starting and maintaining the speed of the DC shunt motor. The 3 point starter connects the resistance in series with the circuit which reduces the high starting current and hence protects the machines from damage.
Why do we need a 3 point starter for a DC machine?
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.
Which type of winding is used in DC shunt motor?
field winding
In a DC Shunt motor the field winding is connected in parallel (shunt) with the armature. The shunt winding is wound from many turns of small copper wire and since it is connected across the DC field supply, its field current will be constant.
How do you control the speed of a DC shunt motor?
In the shunt motor, speed can be controlled by connecting a variable resistor Rc in series with the shunt field winding. In the diagram below resistor, Rc is called the shunt field regulator. Figure: (a) Speed control of a D.C. shunt motor by variation of field flux.
Are DC motors self starting?
The sources of the DC motor are batteries and cells. DC motors are self-starting motors. The armature is stationary, and the magnetic field rotates in the AC motor but in DC motor the armature rotates, and the magnetic field is stationary.
Which of the following starter can sufficiently start the DC series motor *?
Explanation: 2-point starter is enough to start the DC series motor.
Starting of DC Motors. A starter is a device to start and accelerate a motor. A controller is a device to start the motor, control and reverse the speed of the DC motor and stop the motor. While starting the DC motor, it draws the heavy current which damages the motor. The starter reduces the heavy current and protects the system from damage.
What are the different types of DC motor starters?
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.
How do you start a motor without excessive armature current?
By placing a large resistance in the circuit at starting and reducing it in steps as the speed increases, the motor may be started quickly without excessive armature current. Both manual and automatic starters are used to do this. Figure 2 shows a manual starter circuit diagram.
What is the purpose of a motor starter?
Starters are used to protect DC motors from damage that can be caused by very high current and torque during startup. They do this by providing external resistance to the motor, which is connected in series to the motor’s armature winding and restricts the current to an acceptable level. To see why DC…