Report content

1. Nominal data of the researched motors and metrological characteristics of measuring devices.

2. Chart of carrying out of experiments.

3. Table of measuring and computations and used computation formulas.

4. Speed-torque and moment characteristics of motors.

5. Short conclusions on work.

Control questions

1. Write equation of electric equilibrium in the contour of generator armature and direct current motor armature. What distinctions do you see between these equations?

2. Write a formula of electromagnetic moment of direct current motor. Whether the same formula does determine an electromagnetic moment, that is created on the shaft of direct current generator?

3. Explain for what physical reason does the initial starting current of motor exceed much more nominal one.

4. How will rotor speed of direct current motor with the parallel excitation be changed, that runs without load, if break an excitation circuit?

5. What features has motor with series excitation at no-load operation?

Laboratory work4

RESEARCH OF THREE-PHASE ASYNCHRONOUS MOTOR WITH SQUIRREL-CAGE ROTOR

Aim of work

Study of design, operation principle, properties and characteristics of asynchronous motor with the squirrel-cage rotor. Determination of the explored motor parameters by experiments results of open and short circuit; construction of speed-torque characteristic of motor.