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Explanation of the Electric Motor Demonstrated in Class. I. I. Explanation of the Electric Motor Demonstrated in Class. Rotor or armature (the rotating piece of the motor ). I. I. Explanation of the Electric Motor Demonstrated in Class. B coil. Which induces this B-field. - PowerPoint PPT Presentation
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I I
Explanation of the Electric Motor Demonstrated in Class
I
Rotor or armature(the rotating piece of the motor)
Explanation of the Electric Motor Demonstrated in Class
I
τ I
I
I IBext Bext
Coils (or bar magnets) are used to create the external magnetic field
Bcoil
Follow the wires and find this direction of current at this instant
Which induces this B-field
Explanation of the Electric Motor Demonstrated in Class
To align the B-fields, a CW torque is created. In this position, the torque is maximum
Rotor or armature(the rotating piece of the motor)
τI
I
I IBext Bext
The rotor rotatesBcoil
Explanation of the Electric Motor Demonstrated in Class
In this position, the angle between Bcoil and Bext has decreased, so the torque has decreased
τ=0
Bcoil
I IBext BextBcoil
The rotor continues to rotate
In this position, the B-fields are aligned and the torque is zero
Explanation of the Electric Motor Demonstrated in Class
τI
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B coil
I IBext Bext
Momentum carries the rotor further around
Follow the wires in this position and find that the current in the coils has changed direction
Inducing a B-field in this direction
And so the torque continues to be clockwise.
Explanation of the Electric Motor Demonstrated in Class
τ I
I
I IBext Bext
Bcoil
The rotor rotates to this position, which is 180º from where it started.Since the current and Bcoil have switched directions, it is essentially the same configuration as it was at the start.
Explanation of the Electric Motor Demonstrated in Class
And so, the process repeats…
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