Which motor does not utilize brushes in its operation?

Which motor does not utilize brushes in its operation?

• A. DC shunt
• B. DC series
• C. Squirrel cage induction
• D. Compound

Answer: (C)

The squirrel cage induction motor operates without brushes due to its design and principle of operation. This type of motor is an example of an alternating current (AC) motor, which uses electromagnetic induction to generate torque. In a squirrel cage induction motor, the rotor consists of conductive bars cast in a cylindrical shape, resembling a squirrel cage. This configuration allows for a magnetic field created by the stator to induce a current in the rotor. As the magnetic field rotates, it induces a current in the rotor bars, creating a rotating magnetic field without the need for direct electrical contact via brushes. In contrast, DC shunt, DC series, and compound motors are all types of direct current motors that rely on brushes to maintain electrical contact with rotating components. These brushes are necessary to supply current to the armature as it rotates within a magnetic field. Hence, the brushless operation of the squirrel cage induction motor distinguishes it as the only motor in this context that does not utilize brushes in its operation.

The squirrel cage induction motor operates without brushes due to its design and principle of operation. This type of motor is an example of an alternating current (AC) motor, which uses electromagnetic induction to generate torque.

In a squirrel cage induction motor, the rotor consists of conductive bars cast in a cylindrical shape, resembling a squirrel cage. This configuration allows for a magnetic field created by the stator to induce a current in the rotor. As the magnetic field rotates, it induces a current in the rotor bars, creating a rotating magnetic field without the need for direct electrical contact via brushes.

In contrast, DC shunt, DC series, and compound motors are all types of direct current motors that rely on brushes to maintain electrical contact with rotating components. These brushes are necessary to supply current to the armature as it rotates within a magnetic field. Hence, the brushless operation of the squirrel cage induction motor distinguishes it as the only motor in this context that does not utilize brushes in its operation.