PROBLEMAS DE DINAMICA DE LOS ACCIONAMIENTOS ELCTRICOS 1. Figure 1 shows a weight of 1000 kg being lifted up at a velocity of 1 m/sec by means of a motor running at 960 rpm and a winch having a diameter of 0.30 m. The inertia of the motor and the winch drum are 1.6 kg-m2 and 3.2kg-ma respectively. Calculate the total load torque of the system referred to the motor shaft. (Pillai, Problem 2.3)

Fig. 1. Drive system for Problem-2. Ans: 11.57 Nm,

2. A horizontal conveyer belt moving at a uniform velocity of 1 m/sec. transports load at the rate of 50,000 kg/hour. The belt is 180 m long and is driven by a 960 rpm motor. (Pillai, Problem 2.4) (a) Determine the equivalent rotational inertia at the motor shaft. (b) Calculate the required braking torque at the motor shaft to stop the belt at a uniform rate in 10 sec?

Ans: (a) 0.25 Kg-m2; (b) 2.5 Nm

3. A typical active load is: a) Hoist b) Blower c) Pump d) Lathe

4. Active loads : (a) Have the capacity to accelarate as well as decelerate the drive motor (b) Have the capacity only to oppose the motion trying to retard the motor (c) Have the capacity to provide accelerating torque only. (d) All the above

5.

Fundamental of elctrical drives . Mohamed a. El -Sharkawi Fundamental of elctrical drives . Mohamed a. El -Sharkawi Maquinas electricas y sistemas de potencia, Thodeore Wildi