HSC Together Year 12 Physics: DC Motors

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# DC Motors

This section is part of the HSC Physic syllabus Module 6: Electromagnetism under Applications of the Motor Effect.

Motors are the core of how so many mechanical systems work in today’s world. So let’s learn a little more about how a DC motor works. We’re going to cover the following information about a DC motor:

• Components of a DC motor
• How DC motors work
• Torque generation in a DC motor

### How DC motors work

The main components of a DC Motor are:

• Stator
• An armature
• A rotor
• A commutator with brushes.

### The production of torque in a DC motor

The formulae we know for toque is:

\tau = Fd sin(\theta)

In a DC motor toque becomes:

\tau = B I h \frac{w/2}
• B is the magnetic field
• I is the current
• H is the height of the wire
• W is the width of the loop

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