Day 15: AC and DC Motors

In a DC motor, the contains a laminated, soft-iron core, coils, and a commutator, all mounted on a rotatable steel shaft.

• Armature assembly
• Field assembly

• Brush assembly

Tags

NGSS.HS-PS3-5

In a DC motor, the consists of the field frame, pole pieces, and field coils.

• Armature assembly

• Field assembly
• Brush assembly

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-3

In a DC motor, the consists of the brushes and their holders.

• Armature assembly

• Field assembly

• Brush assembly

A DC motor’s speed can be controlled by varying the current in the .

• Field windings
• Armature windings

• Brush holders

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-3

The part of a DC motor that ensures unidirectional current flow through the armature is the .

• Stator

• Commutator
• Rotor

A DC motor has a high starting torque due to its windings being connected in series.

• Series
• Shunt

• Compound

The DC motor is designed for applications requiring constant speed and low starting torque.

• Series

• Shunt

Tags

NGSS.HS-PS3-3

A compound DC motor has both ______ and shunt field windings.

• Series
• Commutator

• Rotor

In a DC motor, the voltage induced in the armature windings as the motor rotates is called .

• Counter emf
• Induced current

• Forward voltage

Tags

NGSS.HS-PS2-5

To reverse the direction of rotation of a DC motor, the direction of current must be reversed in either the _____ or the ______.

• Rotor, stator
• Armature, field windings
• Brushes, commutator