Why the direction of rotation is changed by changing armature current in a DC compound motor DC?

Why the direction of rotation is changed by changing armature current in a DC compound motor?

The rotation of a compound-wound motor can be reversed by changing the direction of the current in the field or the armature circuit, ( 5). Since the series field coils must also be reversed if the shunt field is reversed, it’s easier to reverse the current in the armature only.

Why does a motor rotate in reverse direction when the current through the field or armature circuit is reversed?

These motors attempt to copy electronically the action of brushes and commutator on a d.c. machine. This arrangement ensures that the armature-coil currents are reversed (commutated) when the coils rotate from under the influence of one field polarity to the opposite polarity.

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Why is it important to reverse only the armature leads when changing the rotation of a compound motor?

When a compound motor is to be reversed, only the armature leads are changed. If the motor is reversed by changing the shunt field leads, the motor will be changed from a cumulative compound motor to a differential compound motor. If this happens, the motor speed will drop sharply when load is added to the motor.

What determines the direction of rotation of a DC motor?

The direction of rotation of a DC motor depends on the direction of the magnetic field and the direction of current flow in the armature. If either the direction of the field or the direction of current flow through the armature is reversed, the rotation of the motor will reverse.

Can we change the direction of rotation of DC shunt motor?

Hence the direction rotation of the motor can be reversed by reversing the current through either the armature winding or the field coils. … Now in the case of a DC shunt motor, the direction of the motor can be reversed by changing the direction of current in the armature or field winding but not both at the same time.

How do you change the direction of a DC motor?

Direction reversal of DC Series Motor:

Thus in the case of DC series motor, the speed can not be changed by changing the polarity of the armature voltage. The direction of rotation of the DC series motor can be changed only if the direction of either field current or armature current is changed.

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What will happen if the direction of current at the terminals of a DC motor is reversed?

What happens if the direction of current at the terminals of a series motor is reversed? … The motor would work, but the direction of rotation will not change, since the connection between the field and armature is not disturbed.

How can the direction of rotation of a DC electric motor be changed quizlet?

How can the direction of rotation of a DC electric motor be changed?. Option A. reverse the electrical connections to either the field or armature windings. … reverse the electrical connections to either the field or armature windings.

Which connections must be reversed to reverse the direction of rotation of a DC motor?

The direction of rotation of a dc motor depends on the direction of the magnetic field and the direction of current flow in the armature. If either the direction of the field or the direction of current flow through the armature is reversed, the rotation of the motor will reverse.

How direction of rotation of a traction motor is reversed?

In order to reverse the direction of an AC motor, the magnetic fields must be altered to provoke movement in the opposite direction. Since each wire consists of a positive and negative current within the magnetic fields, the flip-flopping of main and starter wires causes the motor to run in reverse rotation.

How do you control the speed of DC motor?

Thus, there are three general methods of speed control of D.C. Motors.

  1. Resistance variation in the armature circuit: This method is called armature resistance control or Rheostat control.
  2. Variation of field flux Ф This method is called field flux control.
  3. Variation of the applied voltage.
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