DC motors have the advantage of: higher starting torque, quick starting and stopping, reversing, variable speeds with voltage input and they are easier and cheaper to control than AC. AC motor advantages include: lower power demand on start and minimal maintenance.
Why DC motors are preferred over AC motors?
AC motors are generally considered to be more powerful than DC motors because they can generate higher torque by using a more powerful current. However, DC motors are typically more efficient and make better use of their input energy.
Where are DC motors preferred?
AC slip ring or DC compound motors are prefer for lifts. Shunt type commutator motors are preferred in case of single phase installation.
Can DC motors run on AC?
DC cannot produce varying flux as it is constant and uni directional. But DC motors may run on AC supply . The DC series motor can run on both AC &DC supply . It is also called as an Universal motor.
For which of the following applications a DC motor is preferred?
Why are the DC motors preferred for traction applications? Explanation: DC motors are used for traction as, according to the characteristics of DC motors speed is inversely proportional to torque and square of armature current as well, if linear magnetization is concerned.
What are the disadvantages of DC motors?
Disadvantages of DC motors
- High initial cost.
- Increased operation and maintenance cost due to the presence of commutator and brush gear.
- Cannot operate in explosive and hazard conditions due to sparking occur at brush (risk in commutation failure)
Are DC motors quieter than AC?
The new technology in the motors means that DC fans are generally much quieter than AC motors. DC fans use up to 70% less energy than an AC fan. DC fans are generally faster to respond to the remote control, have more speed options and have the reverse function on the remote.
What are the advantages and disadvantages of DC motor?
Advantages and Disadvantages of DC Motors
- They are suitable for low-speed torque.
- They have adjustable speed.
- They offer a wide range of speed control both below and above the rated speed.
- They have a very high and strong starting torque.
What are applications of DC motor?
Applications of DC Motors
- Series Motors. The series DC motors are used where high starting torque is required and variations in speed are possible. …
- Shunt Motors. …
- Compound Motors. …
- Separately Excited DC Generators. …
- Shunt wound Generators. …
- Series Wound Generators.
What is the purpose of DC motor?
What is a 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.
Why are DC motors more expensive than AC?
The rotor design is probably the most important factor in making the DC motor more expensive. If the DC motor stator has permanent magnets, that could make it more expensive or not depending on the magnet material. There are many more manufacturers making AC motors and many more AC motors used at 1000 kW.
Can a DC motor run on AC alternatively can a AC motor run on DC?
An AC motor cannot run on an DC SUPPLY.. The DC series motor can run on both AC &DC supply . It is also called as an Universal motor. … In the Universal (AC/DC) the series field reverses in tandem with the Armature current.
Why don t Electric cars use DC motors?
The only “DC” motor which does not require some form of inverter or electronic switching system is the mechanical brushed motor. These are so unsuited to the task of light weight variable speed drives that there will be few if any used in modern electric car designs.
Why starters are required in a DC motor?
1. Why starters are required in a DC motor? … Explanation: Starting resistance of a DC shunt motor and DC compound motor is low. Well, that’s the reason why we use starters in a DC motors, in order to limit the armature current flowing through the armature and to protect machine circuitry.
Which type of DC motor is preferred for variable speed application?
Compound DC motors or compound wound motors have both series and shunt field windings. These types of motors offer good starting torque, but they may have control problems in variable speed drive applications. These motors can be connected to two arrangements: cumulatively and differentially.
Which power is mentioned on a name plate of a motor?
Which power is mentioned on a name plate of a motor? Explanation: Name plate of the motor shows rated values i.e. rated speed, rated current, rated voltage. It also shows output power available at shaft when all other quantities are set to rated values.