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A permanent magnet DC motor is being considered for use as a drive motor for a vehicle. The motor is known to have the following properties
No load speed @ 100 V = 2000 rpm torque at 20 A = 10 Nm R = 0.5 Ω
a) What is the full load (10 Nm) speed when the machine runs with the rated voltage of 100 V?
b) What terminal voltage V is needed to provide the cruising speed requirement of 2500 rpm with a torque of 10 Nm?
c) What terminal voltage V is needed to provide a braking torque of 10 Nm at zero speed ?
d) If the armature of this machine were short circuited (V = 0), what would be the current and torque if it was driven at 1000 rpm by the moving vehicle.
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thermal runaway assingment
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Design a logic circuit when to provide an output when any two or three of four switches are closed.
Insulators have (A) A full valence band. (B) An empty conduction band. (C) A large energy gap. (D)All the above. Ans: Insulators have a large energy gap.
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a dc generator has 300 turns in each field coil. the flux per pol is 0.1 wb. find the average value of EMF inducet in field winding in the flux decays to zero in 0.3 second?
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