Explain the necessity of starter on a DC motor.

Question

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Answer 1

Question

Chapter 44, Problem 1SQ

To determine

Explain the necessity of starter on a DC motor.

Expert Solution & Answer

Explanation of Solution

A starter is an electrical device used to start and accelerate a motor. It is used to limit the inrush current.

Consider the equation of armature current in a DC motor as follows:

Ia=E−EcRa (1)

Here,

E is the terminal voltage,

Ec is the counter emf,

Ra is the armature resistance.

When a motor is started, the armature is stationary at the moment and no counter EMF will be generated. Therefore, Ec=0.

As the counter emf is zero, equation (1) becomes as follows:

Ia=ERa (2)

Typically, a motor armature resistance is very low. From equation (2), the armature current is inversely proportional to the armature resistance where the armature current is high at the starting of a motor. This high current can create damage to the windings, commutator, and brushes.

Therefore, a starter is used to limit the excessive flow of current and prevent damage to the motor due to the lack of a counter emf and inductive reactance.

Conclusion:

Thus, the necessity of starter on a DC motor is explained.

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Answer 2

Question

Chapter 44, Problem 1SQ

To determine

Explain the necessity of starter on a DC motor.

Expert Solution & Answer

Explanation of Solution

A starter is an electrical device used to start and accelerate a motor. It is used to limit the inrush current.

Consider the equation of armature current in a DC motor as follows:

Ia=E−EcRa (1)

Here,

E is the terminal voltage,

Ec is the counter emf,

Ra is the armature resistance.

When a motor is started, the armature is stationary at the moment and no counter EMF will be generated. Therefore, Ec=0.

As the counter emf is zero, equation (1) becomes as follows:

Ia=ERa (2)

Typically, a motor armature resistance is very low. From equation (2), the armature current is inversely proportional to the armature resistance where the armature current is high at the starting of a motor. This high current can create damage to the windings, commutator, and brushes.

Therefore, a starter is used to limit the excessive flow of current and prevent damage to the motor due to the lack of a counter emf and inductive reactance.

Conclusion:

Thus, the necessity of starter on a DC motor is explained.

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Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 3

Question

Chapter 44, Problem 1SQ

To determine

Explain the necessity of starter on a DC motor.

Expert Solution & Answer

Explanation of Solution

A starter is an electrical device used to start and accelerate a motor. It is used to limit the inrush current.

Consider the equation of armature current in a DC motor as follows:

Ia=E−EcRa (1)

Here,

E is the terminal voltage,

Ec is the counter emf,

Ra is the armature resistance.

When a motor is started, the armature is stationary at the moment and no counter EMF will be generated. Therefore, Ec=0.

As the counter emf is zero, equation (1) becomes as follows:

Ia=ERa (2)

Typically, a motor armature resistance is very low. From equation (2), the armature current is inversely proportional to the armature resistance where the armature current is high at the starting of a motor. This high current can create damage to the windings, commutator, and brushes.

Therefore, a starter is used to limit the excessive flow of current and prevent damage to the motor due to the lack of a counter emf and inductive reactance.

Conclusion:

Thus, the necessity of starter on a DC motor is explained.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 4

Question

Chapter 44, Problem 1SQ

To determine

Explain the necessity of starter on a DC motor.

Expert Solution & Answer

Explanation of Solution

A starter is an electrical device used to start and accelerate a motor. It is used to limit the inrush current.

Consider the equation of armature current in a DC motor as follows:

Ia=E−EcRa (1)

Here,

E is the terminal voltage,

Ec is the counter emf,

Ra is the armature resistance.

When a motor is started, the armature is stationary at the moment and no counter EMF will be generated. Therefore, Ec=0.

As the counter emf is zero, equation (1) becomes as follows:

Ia=ERa (2)

Typically, a motor armature resistance is very low. From equation (2), the armature current is inversely proportional to the armature resistance where the armature current is high at the starting of a motor. This high current can create damage to the windings, commutator, and brushes.

Therefore, a starter is used to limit the excessive flow of current and prevent damage to the motor due to the lack of a counter emf and inductive reactance.

Conclusion:

Thus, the necessity of starter on a DC motor is explained.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!

Answer 5

Chapter 44, Problem 1SQ

To determine

Explain the necessity of starter on a DC motor.

Expert Solution & Answer

Explanation of Solution

A starter is an electrical device used to start and accelerate a motor. It is used to limit the inrush current.

Consider the equation of armature current in a DC motor as follows:

Ia=E−EcRa (1)

Here,

E is the terminal voltage,

Ec is the counter emf,

Ra is the armature resistance.

When a motor is started, the armature is stationary at the moment and no counter EMF will be generated. Therefore, Ec=0.

As the counter emf is zero, equation (1) becomes as follows:

Ia=ERa (2)

Typically, a motor armature resistance is very low. From equation (2), the armature current is inversely proportional to the armature resistance where the armature current is high at the starting of a motor. This high current can create damage to the windings, commutator, and brushes.

Therefore, a starter is used to limit the excessive flow of current and prevent damage to the motor due to the lack of a counter emf and inductive reactance.

Conclusion:

Thus, the necessity of starter on a DC motor is explained.

Answer 6

Chapter 44, Problem 1SQ

To determine

Explain the necessity of starter on a DC motor.

Expert Solution & Answer

Explanation of Solution

A starter is an electrical device used to start and accelerate a motor. It is used to limit the inrush current.

Consider the equation of armature current in a DC motor as follows:

Ia=E−EcRa (1)

Here,

E is the terminal voltage,

Ec is the counter emf,

Ra is the armature resistance.

When a motor is started, the armature is stationary at the moment and no counter EMF will be generated. Therefore, Ec=0.

As the counter emf is zero, equation (1) becomes as follows:

Ia=ERa (2)

Typically, a motor armature resistance is very low. From equation (2), the armature current is inversely proportional to the armature resistance where the armature current is high at the starting of a motor. This high current can create damage to the windings, commutator, and brushes.

Therefore, a starter is used to limit the excessive flow of current and prevent damage to the motor due to the lack of a counter emf and inductive reactance.

Conclusion:

Thus, the necessity of starter on a DC motor is explained.

Answer 7

Chapter 44, Problem 1SQ

To determine

Explain the necessity of starter on a DC motor.

Answer 8

Expert Solution & Answer

Explanation of Solution

A starter is an electrical device used to start and accelerate a motor. It is used to limit the inrush current.

Consider the equation of armature current in a DC motor as follows:

Ia=E−EcRa (1)

Here,

E is the terminal voltage,

Ec is the counter emf,

Ra is the armature resistance.

When a motor is started, the armature is stationary at the moment and no counter EMF will be generated. Therefore, Ec=0.

As the counter emf is zero, equation (1) becomes as follows:

Ia=ERa (2)

Typically, a motor armature resistance is very low. From equation (2), the armature current is inversely proportional to the armature resistance where the armature current is high at the starting of a motor. This high current can create damage to the windings, commutator, and brushes.

Therefore, a starter is used to limit the excessive flow of current and prevent damage to the motor due to the lack of a counter emf and inductive reactance.

Conclusion:

Thus, the necessity of starter on a DC motor is explained.