Calculate the acceleration time, Mathematics

Question

A 22 kW, 3-phase, 415 V, 40 A, 50 Hz, 960 rpm, 0.88 PF squirrel cage induction motor drives a pump. The total inertia of the drives system is 1.2 kg-m2.

Determine the number of starts per minute this drive can be subjected to without exceeding the total power dissipated in the motor under rated conditions. Assume a ratio of stator to rotor resistance of unity and neglect magnetizing current and rational losses.

Hint: Energy lost by the motor during starting under no load = ½ * J * wS2

(1 +Stator resistance / Rotor resistance).

Question

Considering the same 22 kW of the above problem and the same assumptions, what will be the effect of the no. of starts restriction if the motor is of 2 pole construction?

Question

Consider a motor of 1000 kW, 996 rpm rating with an inertia of 80 kg-m2; driving a fan of Load Inertia: 1875 kg-m2. Load torque required at 650rpm can be assumed to be 45%. Frictional Torque can be assumed to be 10%. Calculate the acceleration time of the motor up to 650 rpm assuming that the motor has to accelerate without driving the load (solo).

Hint: Angular acceleration = (Final speed, rps - Initial speed, rps) / Acceleration Time.

Question

The above referred drive system is engineered such that the motor gets coupled to the load at 650 rpm. What is the torque available for the motor to accelerate in this loaded condition? Calculate the acceleration time to reach a speed of 700 rpm.

Posted Date: 2/26/2013 12:21:58 AM | Location : United States







Related Discussions:- Calculate the acceleration time, Assignment Help, Ask Question on Calculate the acceleration time, Get Answer, Expert's Help, Calculate the acceleration time Discussions

Write discussion on Calculate the acceleration time
Your posts are moderated
Related Questions
Mona purchased one and a half pounds of turkey at the deli for $6.90. What did she pay per pound? Divide the cost of the turkey by the weight; $6.90 ÷ 1.5 = $4.60.

Leptokurtic a) A frequency distribution which is lepkurtic has normally a higher peak than that of the general distribution. The coefficient of kurtosis while determined will

On dividing the polynomial 4x 4 - 5x 3 - 39x 2 - 46x - 2 by the polynomial g(x) the quotient is x 2 - 3x - 5 and the remainder is -5x + 8.Find the polynomial g(x). (Ans:4 x 2 +

Question: a. What is the inverse of f (x)? b. Graph the inverse function from part (a). c. Rewrite the inverse function from part (a) in exponential form. d. Evaluate

HOW MANY number laying between 100 and 1000 can be formed with 0,1,2,3,4,5 and also divisible by 5 with distinct digit

no the parallel lines do not meet at infinity because the parallel lines never intersect each other even at infinity.if the intersect then it is called perpendicuar lines

On dividing p(X)=5x^(4)-4x^(3)+3x^(2)-2x+1 by g(x)=x^(2)+2 if q(x)=ax^(2)+bx+c, find a,b and c.

X and Y are centers of circles of radius 9cm and 2cm and XY = 17cm. Z is the centre of a circle of radius 4 cm, which touches the above circles externally.  Given that XZY=90 o , w


70 multiply 67