Electrical Drive Control: Textbook with Applicative Aspects by Bahir Zeev

Author:Bahir, Zeev [Bahir, Zeev]
Language: eng
Format: azw3
Publisher: Contento Now
Published: 2015-07-31T16:00:00+00:00

Figure 4-18a. Liquid stirring system

For calculations, use the approximate torques-speed characteristic of an induction motor, shown in Figure 4-18b.

Figure 4-18b. Approximate torques-speed characteristic

Suppose the steady state speed of the motor is synchronous speed

= 1500rpm.

Transmission ratio is TR=0.2

The Liquid’s resistance to the stirrer’s rotation linearly increases with the motor speed increase.

Initial required torque on the stirrer shaft is 30Nm.

At final speed, the required torque on the stirrer shaft is 80Nm.

The stirrer’s moment of inertia on the stirrer shaft is 10Nmsec2. The motor’s and transmission’s moment of inertia is negligible.

a. What is the system’s starting time, that is, the time passing from the moment the motor is started until the system reaches its final speed?

b. The system is stopped by disconnecting the armature from the feed source. What is the motor’s stopping time?

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