Design Project
As an electrical engineer, you are asked to design a low-voltage, high-current, shunt-excited DC motor for an industrial facility. The motor should have the following specifications:
- The output power of the machine is expected to be between (20+XX+YY) hp. Where XX (first student) and YY (second student) are the last two digits of your KFUPM ID number, e.g., 01, 02, 10, 12, 20, ..etc.
- The copper losses in the machine should be between 4% and 7% of the output power.
- The brush losses in the machine should be between 2% and 5% of the copper losses.
- The no load power should not exceed 6% of the output power.
- The motor speed is available between 900 and 1200 rpm.
- The supply voltage is 240V.
- The brush voltage drop is 2V each.
- The magnetization curve is linear and given as ? (Wb) =0.025x (A).
- The flux per pole should not exceed 25 mWb.
- The number of poles is up to 8 poles.
- The armature resistance is between (0.05 to 0.12) Ω.
Explain all your design steps and give all the machine parameters and variables in Table I. Assume any missing data in your report.
Table I
|
Parameter
|
Value
|
Unit
|
|
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Pout
|
|
hp
|
|
Pout
|
|
Watt
|
|
|
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Ka
|
|
|
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Z
|
|
|
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Number of Poles
|
|
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|
Ipath
|
|
|
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Ra
|
|
|
|
Vt
|
|
|
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It
|
|
|
|
If
|
|
|
|
|
|
|
|
Ia
|
|
|
|
Ea
|
|
|
|
Tdev
|
|
|
|
Motor Speed
|
|
|
|
|
|
|
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Pdev
|
|
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|
Pcopper
|
|
|
|
Pbrush
|
|
|
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Pno-load
|
|
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|
Prot
|
|
|
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Pinput
|
|
|
|
Tout
|
|
|
|
efficiency
|
|
|