Maurice Tutor

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  • MCS,PHD
    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
    Oct-2001 - Nov-2016

Category > Management Posted 27 Feb 2018 My Price 6.00

permanent-magnet dc

An 1100-W, 150-V, 3000-r/min permanent-magnet dc motor is to be operated from a current-source inverter so as to provide direct control of the motor torque. The motor torque constant is Km -- 0.465 V/(rad/sec); its armature resistance is 1.37 ΩThe motor rotational loss at a speed of 3000 r/min is 87 W. Assume that the rotational loss can be represented by a constant loss torque as the motor speed varies.

a. Calculate the rated armature current of this motor. What is the corresponding mechanical torque in N.m?

b. The current source supplies a current of 6.2 A to the motor armature, and the motor speed is measured to be 2670 r/min. Calculate the load torque and power.

c. Assume the load torque of part (b) to vary linearly with speed and the motor and load to have a combined inertia of 2.28 x 10 -3 kg.m2. Calculate the motor speed as a function of time if the armature current is suddenly increased to 7.0 A.

 

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Maurice Tutor
(5)
Status NEW Posted 27 Feb 2018 09:02 PM My Price 6.00

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