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12-13 motor - ME250 Design and Manufacturing I Electric...

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ME250 Design and Manufacturing I El t i M t Electric Motors
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Outline Introduction Operation principle Permanent magnet DC motors Summary 2
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Introduction Converts electrical power to mechanical power Electric power = current X voltage M h i l f X l it t X l Mechanical power = force X velocity or torque X angular velocity Electrical power Mechanical power I , V F, v or T, 3
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Introduction Major types AC motor DC t DC motor Stepper motor Linear motor 4
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Introduction Pros Available in smaller sizes than IC engines N h t No exhaust gasses Less noise than IC engines Easy control of torque/speed by voltage/current Cons Lower power-weight ratio than IC engines Lower power-cost ratio than IC engines Batteries have lower energy density than fossil fuels Batteries are more expensive than fossil fuels 5
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Operation principle Force on current-carrying wire in magnetic field ) ( B I F i F : Lorentz force vector [N]; perpendicular to both B and I . i : current [A] I : vector of wire in magnetic filed [m] B : vector of magnetic flux density [tesla] F F B B I 6 I
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