We already know that in a DC Series motor the field winding has very less resistance than a DC Shunt Motor as the field is connected in series with the Armature Winding. So if we give AC supply on a DC Series Motor it will run perfectly. In fact, DC Series can run on both AC and DC supply.
What will happen if DC motor is connected across AC supply?
1. What will happen if DC shunt motor is connected across AC supply? Explanation: In case of parallel field connection, it won’t rotate at all and will start humming and will create vibrations, as a torque produced by positive and negative cycle will cancel out each other. DC motor will be heated up and it may burn.
Can a brushed DC motor run on AC?
Yes, a series motor, which is a kind of brushed motor, works both on DC and AC.
Why is the DC motor preferred over AC motor?
D.C. motor is preferred over an A.C. motor when we need variable speed operation because As in DC series motor field winding and armature winding is in series. So whenever armature current changes field current also changes as they are same due to which its torque changes rapidly and we get a variable speed.
Which part will surely tell that given motor is DC motor and not an AC type a winding B shaft C commutator D stator?
Commutator will surely tell that given motor is DC motor and not an AC type.
Which motor can be run either with AC or DC supply?
On reversing the polarity of the line terminals of a DC Series Motor, the motor will continue to run in the same direction. A universal motor is a commutation type motor. The universal motor produces approximately the same speed and output when operated either on a direct or single-phase AC source.
Which motor works on both AC and DC?
A universal motor is a special type of motor which is designed to run on either DC or single phase AC supply. These motors are generally series wound (armature and field winding are in series), and hence produce high starting torque (See characteristics of DC motors here).
Will a DC shunt motor operates on AC supply?
The Shunt winding has a large number of turns so that it has appreciable inductance. When A.C is applied to a shunt motor, the large inductive reactance of shunt winding will reduce the field current too much. Consequently, Shunt motor will not usually run on A.C Supply.
What is the disadvantage of DC motor?
DC Motor Advantages & Disadvantages
| Advantages | Disadvantages |
|---|---|
| Inexpensive controls for speed regulation | Cogging at speeds of less than 300 rpm |
| Generally a low-cost motor option | Significant power loss on full wave rectified voltage |
| Easily pairs with gear reducers | High starting torque can damage reducers |
Are DC motors better than AC?
DC motors offer better speed variation and control and produce more torque than AC motors.
Are AC motors cheaper than DC?
In general, AC motors were smaller, less expensive, lighter and more rugged than DC motors. DC motors, on the other hand, operated better in variable-speed applications, particularly those requiring wide speed ranges, and provided more precise speed control.
Which DC motor is preferred for elevator?
DC cumulative compound motor having high starting torque up to 450% depending upon the degree of compounding. The speed regulation is varying up to 25 ~ 30%. That’s why these motors are used in elevators.
What will happen if the back emf of a DC motor suddenly disappeared?
If back emf of a dc motor vanishes suddenly, motor circuit will try to retain back emf by drawing more current from supply. As the back emf vanishes zero, the whole supply voltage appears across armature and heavy current flows.
What makes a DC motor go faster?
The speed of rotation of the coil can be increased by:
increasing the size of the current; using a stronger magnet; increasing the number of turns of wire in the coil; reducing friction between the coil and the axel it rotates on.
How do I know if a motor is AC or DC?
Look for the stator core construction and rotor. If there is no commutator, then it is a AC motor. If there is a commutator and brushes, it may be either a DC motor or an AC commutator motor (Universal motor).
Are Tesla motors AC or DC?
Tesla, for example, uses alternating current (AC) induction motors in the Model S but uses permanent-magnet direct current (DC) motors in its Model 3. There are upsides to both types of motor, but generally, induction motors are somewhat less efficient than permanent-magnet motors at full load.
Why is DC more efficient than AC?
DC transmission lines have lower losses than AC ones, so in that case DC is more efficient. Transformers are superb at changing voltage levels for AC, any equivalent for DC will have higher losses and thus be less efficient.
How long can I run a DC motor?
The brush life for medium horsepower DC motors with good commutator film with commutator surface speeds of 2,500 to 4,000 feet per minute is an estimate. The maximum life is 10,000 hours with the minimum being 2,000 to 5000 hours.
How do you maintain an AC DC motor?
Simple checks and routine ac and dc motor maintenance
- Clean motor of any dust or oil.
- Check oil rings turn with shaft.
- Check oil level in bearings.
- Visually check for oil and grease from bearings.
- Technician to examine the starter switch, fuses and tighten loose connections.
What are the disadvantages of DC over AC?
Disadvantages of DC Transmission:
The motor generator set is used to step down the level of DC voltage and the efficiency of Motor-generator set is lower than a transformer. DC transmission system is more complex and costly as compared to the AC transmission system..
Is a generator AC or DC?
AC generator is a mechanical device that converts mechanical energy into AC electrical power. DC generator is a mechanical device that converts mechanical energy into DC electrical power.
Also Check:
| Alternating Current (AC) and Direct Current (DC) | Electric Generator |
|---|---|
| The Electric Motor | Electromagnetic Induction |
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