Can DC motor be driven by AC power supply efficiently?

AC motors consume additional energy to create a magnetic field by inducing a current on the rotor. In fact, the DC motor is 30\% more efficient than AC motors due to the secondary magnetic field being generated from the permanent magnets rather than copper windings.

What happens if an ordinary DC series motor is connected to an AC supply?

What will happen if you connect a dc motor to an ac source? When the ac source changes polarity, the current in the motor will reverse. But the reversal will occur in both the armature winding and the field winding. Therefore, the torque on the armature will remain in the same direction.

What will happen if DC series 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.

When a DC series motor is connected to an AC supply of the same voltage then?

If a DC series motor is connected to an AC supply same current will flow through the series field and armature field after being rectified by the commutator. So, the machine will run but with high sparking at brush, poor pf, low speed and low efficiency.

Which machine can not work on AC supply?

A transformer is a device which step-up or step-down the level of AC current or voltage without changing the primary (i.e. input source) frequency. Transformer only works on AC and can’t be operated on DC i.e. it has been designed to be operated only and only on alternating current and voltage.

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.

What happens when DC series motor is connected to AC supply?

When a DC motor is connected across AC supply it will?

What will happen if the DC motor is connected? Explanation: If there is a parallel field connection, it won’t rotate at all and will start humming, as the positive and negative cycle will cancel out each other. The DC motor may burn when it is heated up.

What will happen if DC motor is connected across AC supply?

What is AC series motor?

AC series motors are also known as the modified DC series motor as their construction is very similar to that of the DC series motor. An AC supply will produce an unidirectional torque because the direction of both the currents (i.e. armature current and field current) reverses at the same time.

Why is a DC series motor not suitable for AC power?

The current in the armature winding is in phase with the magnetic field produced by the field winding. However, a dc series motor does not operate well on ac power. The motor has a low-efficiency power factor and runs with considerable sparking a low the brushes. The low efficiency is caused by high hysteresis loss and high eddy current loss.

Can a universal motor work with AC power supply?

Although its construction is very similar to a series-wound DC motor, a universal motor incorporates several modifications that allow it operate properly on either DC or AC power supply. For proper operation with AC supply, a universal motor incorporates a compensation winding, in series with the armature and field winding.

Why does a DC shunt motor not work on AC power?

As a result, the motor will not run efficiently. Another reason the DC shunt motor does not operate well on ac power has to do with the difference in phase between the field winding and the armature. The field winding has a higher inductive reactance than the armature winding.

Why does an AC motor have a higher reactance than DC?

The winding of equal coils in opposite directions produces a cancelling effect that reduces inductance, and therefore, reactance. AC supply also induces more significant eddy currents than are produced when the motor operates on DC supply.